Page 1 ACCURA 7500 Integrated Digital Protection Relay + High Accuracy Power Meter User Guide[English] Revision 6.00 2019/5/27...
Page 3: Rootech Inc. All Rights Reserved
Indicates alternative voltage or current. Indicates direct voltage or current. Installation Considerations Installation and operation of Accura 7500 should be performed only by qualified, competent personnel that have appropriate training and experience with high voltage and current devices. Caution During installation or use of this product, careless handling of hazardous voltage in field may result in severe injury or death to user.
Page 4 Caution Failure to observe the following instructions may result in serious damage to the device. Do not apply Accura 7500 to voltages and currents that exceed input ratings of PT and CT  To use the device in the other way than specified by manufacturer can cause severe damage.
Page 5 If the original identify markings(trade-mark, serial number, etc) have been defaced, altered, or removed  Rootech shall not be liable for any other claim than a claim solely for the breach of one of the above warranties that is made in accordance with the above described procedures- made by the original purchaser, ⓒ...
Page 6 Only the terms expressed in these limited Warranties shall apply and no distributor, corporation or other entity, individual or employee of Rootech or any other entity is authorized to amend, change or extend the Warranties in any way.
Page 7 Accura 7500 User Guide Revision History Revision History The following versions of Accura 7500 User Guide have been released. Revision Date Description Revision 1.0 2006. 05. 02 Initial draft Revision 1.1 2007. 03. 06 Revision Revision 1.2 2007. 07. 01 Wiring diagram changed Revision 1.3...
Page 8: Table Of Contents
Function of Group E LED ......................... 47 Setup Mode ..............................50 Reset Mode ..............................52 System Mode ..............................53 Reactive power calculation method ......................54 Chapter 5. Operating the Protection Relay ......................57 Page 8 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 9: Table Of Contents
Definite time OVGR..........................95 Instantaneous time OVGR ........................97 SGR Setup ..............................98 Definite time SGR ............................ 99 Fault Reset..............................101 Record (Event record) ............................ 101 Chapter 7. Checking Relay Status ........................103 ⓒ 2006 Rootech Inc. All Rights Reserved Page 9...
Page 10: Table Of Contents
Precautions ............................165 APPENDIX A Design Example ........................166 3-Phase 4-Wire ............................166 3-Phase 3-Wire : 3PT, 2CT ..........................167 3-Phase 3-Wire : Open-Delta, 2CT ....................... 168 Sequence Diagram ............................169 Page 10 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 11: Table Of Contents
Accura 7500 Guide Contents Figures Figure 3.1 Accura 7500 front ........................34 Figure 3.2 Accura 7500 rear ........................34 Figure 3.3 Accura 7500 side ........................35 Figure 3.4 Assembly structure ........................36 Figure 3.5 Panel assembly method ......................36 Figure 3.6 Panel cutting ..........................37 Figure 3.7 Detachment of the unit from the chassis ..................
Page 12: Table Of Contents
Figure 6.45 Status in which ‘ENTER’ key was pressed after changing setup items......... 83 Figure 6.46 Setup value change confirmation screen ................. 84 Figure 6.47 Notifying change is completed ....................84 Figure 6.48 Notifying change is cancelled ....................84 Page 12 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 13: Table Of Contents
Figure 6.85 A screen numbered one lower than the current event record number ........102 Figure 6.86 The screen after the ‘ENTER’ key is pressed in the event record ..........102 ⓒ 2006 Rootech Inc. All Rights Reserved Page 13...
Page 14: Table Of Contents
Figure 8.27 Status in which ‘ENTER’ key was pressed after changing setup items........121 Figure 8.28 Setup value change confirmation screen ................121 Figure 8.29 Notifying change is completed ..................... 121 Page 14 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 15: Table Of Contents
Figure 8.64 Setup value change confirmation screen ................139 Figure 8.65 Notifying change is completed ..................... 139 Figure 8.66 Notifying change is cancelled ....................139 Figure 9.1 IEC Curve A .......................... 143 ⓒ 2006 Rootech Inc. All Rights Reserved Page 15...
Page 16: Table Of Contents
Figure 10.1 UVR setup initial screen ......................163 Figure 10.2 Definite time UVR setup screen ..................... 163 Figure 10.3 DIN setup screen ......................... 164 Figure 10.4 Setup screen for Power recovery CB input channel ..............164 Page 16 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 17: Chapter 1. Introduction
Easy control Accura 7500’s meter function has the same control interface as Accura digital meters [3300, 3500], so a user experienced with a digital meters can easily handle it. The protection relay function displays English characters on the LCD screen so that the relay status can be easily checked and handled, and each relay element comes with an independent selection key for quick access to the setup menu [screen].
Page 18: Features
Harmonics analysis  K factor  Data acquisition through RS485 communication is possible. Power supply AC 85 ~ 265V, 50/60Hz  DC 100 ~ 300V  Power consumption: 20VA/Max 25VA  Page 18 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 19: Application
Accura 7500 performs accurate True RMS measurement for voltage and current waves distorted by harmonics. Power quality analysis Accura 7500 can analyze 2nd to 31th harmonics as well as harmonic distortion factors of voltage and current, and provides K factors. Electrical energy management with high reliability...
Page 20: Chapter 2. Technical Specification
Operation characteristic curve IEC(A, B, C, LI), KEPCO(NI, VI) Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05 times of pickup level Page 20 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 21 Overcurrent ground relay instantaneous time OCGR(50G) Item Range Current Fundamental component of ground current (harmonics and DC offset removal) Rated current Operation setting range 1.0 ~ 50.00A by the step of 0.01A ⓒ 2006 Rootech Inc. All Rights Reserved Page 21...
Page 22 Fundamental component of phase voltage or phase-to-phase voltage (harmonics and DC offset removal) Change characteristic 3-phase voltage(phase-to-neutral voltage) unbalance ratio[%] = ((Vmax – Vmin) / Vaverage) x 100 Operation setting range 5 ~ 100% by the step of 1% Page 22 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 23 1 ~ 6,000s by the step of 1s Reset level 97% of pickup level Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05 times of pickup level ⓒ 2006 Rootech Inc. All Rights Reserved Page 23...
Page 24 Reset level 97% of pickup level Measurement accuracy 1.0% (F.S) Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05 times of pickup level Page 24 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 25 Reset level 97% of pickup level Phase-angle accuracy 2° Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05 times of pickup level ⓒ 2006 Rootech Inc. All Rights Reserved Page 25...
Page 26: Measurement
■ ■ Apparent ■ ■ Energy Active ■ ■ Reactive ■ ■ Apparent ■ Frequency ■ ■ Power factor ■ Voltage ■ Current ■ ■ ■ Demand Power ■ ■ Current Page 26 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 27: Measurement Test
Voltage 0.0 ~ 999.9% ± 1.0% Reading Current 0.0 ~ 999.9% ± 1.0% Reading Demand Power 0.000 ~ ± 9999kW, MW IEC62053-22 Class 0.5S Current 0.000 ~ 9999A, kA ± 0.2% ⓒ 2006 Rootech Inc. All Rights Reserved Page 27...
Page 28: Reliability Test
Immunity to conducted disturbance induced by radio frequency fields IEC61000-4-8 Rated Power Frequency Magnetic 30A/m 30A/m Field IEC61000-4-11 Voltage Dip/Short Interruptions 0.5 cycle, each polarity 100% 0.5 cycle, each polarity 100% Page 28 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 29: Control
Chagne to remote Accura 7500 is operated in a remote mode and the mode is kept regardless of the operations mode of [Remote] and [Local] keys on the front panel.
Page 30: Input & Output
CB CLOSE, CB OPEN, Alarm + 10 channel Rating (CB CLOSE, OPEN) AC250V 25A / DC 30V 15A resistive load 4000 VA, 480W Rating (Alarm, Auxiliary contactor) AC250V 5A / DC 30V 5A resistive load 1250 VA, 150W Page 30 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 31: Communication
Control key Item Area meter: MENU, ↑, ↓, ENTER Type relay: CB ON, CB OFF, Remote, Local ENTER, ESC,↑,↓ relay selection key x 7 Fault Reset, Record, Status, Setup ⓒ 2006 Rootech Inc. All Rights Reserved Page 31...
Page 32: Others
IEC60255-22-6: Conducted RF Immunity  IEC61000-4-8: Rated Power Frequency Magnetic Field  IEC61000-4-12: Voltage Dip/Short Interruptions  Certification  UL[39BY, PROCESS CONTROL EQUIPMENT]  ISO 9001:2015[QMS-1347]  Warranty period 2 years  Page 32 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 33: Chapter 3. Product Installation
5% ~ 95% non-condensing Caution Accura 7500 should be installed in a switchboard cabinet or similar enclosure in order to block user access to its terminal after installing the product. Accura 7500 should be installed at locations where there are no pollutants such as dust, oil and corrosive gases.
Page 36: Step 1: Panel Mounting
Step 1: Panel Mounting Accura 7500 has a front panel draw-out type structure as Figure 3.4. The unit (the internal part excluding the chassis of the Accura 7500 is called “unit” hereafter) and chassis are separated, and when the unit is detached, a terminal that automatically short-circuits the CT is attached to the chassis.
Page 37: Detachment And Assembly Of The Unit For Repair
Reversely, in order to assemble the unit back into the chassis, push the unit along the guides on the upper and lower parts of the inside of the chassis and apply sufficient pressure on the front panel so that the front panel ⓒ 2006 Rootech Inc. All Rights Reserved Page 37...
Page 38: Step 2: External Wiring
Incomplete combination can cause inaccurate detection of current or problems in the digital input and output functions. Step 2: External Wiring Unlike general multi-function relay, Accura 7500 contains a metering CT and a protection CT for accurate measurement, extra special caution is required in CT wiring. Note Each of Protective Earth (PE) and Frame Ground (FG) must be one-point-earthed to the switchboard.
Page 39: Wiring Diagram Example (3P4W 3Pts, 3Cts)
Accura 7500 User Guide Chapter 3. Product Installataion Wiring diagram example (3P4W 3PTs, 3CTs) Figure 3.8 Wiring diagram(3P4W 3PTs, 3CTs) ⓒ 2006 Rootech Inc. All Rights Reserved Page 39...
Page 40: Wiring Diagram Example (3P3W 3Pts, 3Cts)
Chapter 3. Product Installataion Accura 7500 User Guide Wiring diagram example (3P3W 3PTs, 3CTs) Figure 3.9 Wiring diagram (3P3W 3PTs, 3CTs) Page 40 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 41: Wiring Diagram Example (3P3W 2Pts, 2Cts)
Accura 7500 User Guide Chapter 3. Product Installataion Wiring diagram example (3P3W 2PTs, 2CTs) Figure 3.10 Wiring diagram (3P3W 2PTs, 2CTs: 3P3O) ⓒ 2006 Rootech Inc. All Rights Reserved Page 41...
Page 42: Rear Panel Terminal Arrangement Diagram
Chapter 3. Product Installataion Accura 7500 User Guide Rear panel terminal arrangement diagram Figure 3.11 Rear panel terminal arrangement diagram Page 42 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 43: Description Of The Rear Panel Terminals
Ground CT: GS(C6) - GL(C13)  ZCT: ZS(C7) - ZL(C14)  CB ON output: CBON(B8), CBONG(B9) Contactor capacity: 250VAC 25A  CB OFF output: CBOFF(B10), CBOFFG(B11) Contactor capacity: 250VAC 25A  ⓒ 2006 Rootech Inc. All Rights Reserved Page 43...
Page 44 DI 7 : DI7(D10), DIG(D15)  DI 8 : DI8(D11), DIG(D16)  DI 9 : DI9(D12), DIG(D17)  DI 10 : DI10(D13), DIG(D17)  Communication terminal : Ta(D18), Tb(D19), TG(D20)  Page 44 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 46: Chapter 4. Meter Operation/Setup
Chapter 4. Meter Operation/Setup As in Figure 4.1, Accura 7500’s meter part and the protection relay part are completely separated both in functions and structurally. The left-hand side is the meter area and the right-hand side is the protection relay area.
Page 47: Display Mode
If the x1000 LED of group A is turned on, the actual value is 1000 times the displayed values of A, B and  C phases. If the x1000 LED of group E is turned on, the actual value is 1000 times the fourth displayed value.  ⓒ 2006 Rootech Inc. All Rights Reserved Page 47...
Page 48 √ demand current √ √ demand power √ √ kVAR demand reactive power √ √ demand apparent power √ DMD, MAX max demand current √ √ DMD, MAX max demand power Page 48 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 49 Example) If the displayed value of the third row of the LED segment = 20 and the displayed value of the fourth row of the LED segment = 01200, then the actual value is 002001200  2001200. ⓒ 2006 Rootech Inc. All Rights Reserved Page 49...
Page 50: Setup Mode
Note In the menu edit mode, pressing button exits the menu edit mode and moves to the display mode without saving the setup values of the changed menu item. Page 50 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 51 2. At 38400 bps, PC [Master] receives data acknowledgement from the meter first and then the request packet for the next data is sent after min 17msec passes. Also, in case of writing multiple registers, the size is limited to 13 words or less. ⓒ 2006 Rootech Inc. All Rights Reserved Page 51...
Page 52: Reset Mode
Second Enter: resets the menu item and recovers the reset mode. Exits the reset mode and moves to the display mode. Menu items Order Menu item Energy [kWh, kVARh, kVAh] reset Demand [all demand, Peak demand] reset All max/min reset Page 52 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 53: System Mode
Note In the menu edit mode, pressing button exits the menu edit mode and moves to the display mode without saving the setup values of the changed menu item. ⓒ 2006 Rootech Inc. All Rights Reserved Page 53...
Page 54: Reactive Power Calculation Method
Reactive power calculation method Rootech supports two kinds of methods for accurate calculation of reactive power. Method 1: General calculation method Directly measures the reactive power, and obtains the apparent power by the vector apparent power calculation method.
Page 55: Figure 4.3 Power Signs
  PF     The signs denoted by the phase angle of voltage and current are as follows. Figure 4.3 Power signs Figure 4.4 Apparent power vector diagram ⓒ 2006 Rootech Inc. All Rights Reserved Page 55...
Page 57: Chapter 5. Operating The Protection Relay
Chapter 5. Operating the Protection Relay As in Figure 5.1, Accura 7500’s meter part and the protection relay part are completely separated both in functions and structurally. The left-hand side is the meter area and the right-hand side is the protection relay area.
Page 58: Led Display Content
Therefore, if pickup or trip, alarms occur, not only the dedicated LEDs of the protection relay elements are turned on but the LEDs of trip, A, B, C, and G are turned on so that fault situations can be easily noticed. Page 58 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 59: Key Control
Setup Moves to the setup menu that enables checking and change of items required for operation of the Accura 7500’s protection relay functions such as DIO, time and LCD in addition to the basic setup of 7 protection relay elements.
Page 60: Entering The Passcode
If the user changes the passcode and the passcode is not ‘0 0 0 0’, use ‘’, ‘’ keys as in Figure 5.3 to change the number to match the passcode and press Enther key. If you do this all four times, the software lock is released. Page 60 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 61: Lcd Display And Change Setup Values
‘’, ‘’ keys for more than 2 seconds enables movement between digits. Pressing the ‘’ key for more than 2 seconds moves the cursor to upper digits and pressing the ‘’ key moves the cursor to lower ⓒ 2006 Rootech Inc. All Rights Reserved Page 61...
Page 62: Figure 5.5 Inverse Time Ocr Setup Screen
The screens in Figure 5.9 and Figure 5.10 are displayed for only 2 seconds and disappear, and then the upper menu screen appears. Page 62 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 63: Figure 5.8 Screen With Asking For Final Confirmation
Chapter 5. Operating the Protection Relay Figure 5.8 Screen with asking for final confirmation Figure 5.9 Screen with notifying that change is complete Figure 5.10 Screen with notifying that change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 63...
Page 64: Chapter 6. Protection Relay Setup And Analysis
Chapter 6. Protection Relay Setup and Analysis Accura 7500, as in Figure 6.1, supports only 7 essential protection relay elements used in the switchboard of general high voltage consumer and motor load to simplify device control and setup compared to existing relays.
Page 65: Ocr Setup
If inverse time OCR is selected by the ‘ENTER’ key, the inverse time OCR setup screen appears in the LCD as in Figure 6.3. The setup content of each row is explained in Table 6.2. Figure 6.3 Inverse time OCR setup screen ⓒ 2006 Rootech Inc. All Rights Reserved Page 65...
Page 66: Figure 6.4 Status Where The Partial Cursor Appears For Change
In the status in Figure 6.5, change of other items can be done in the same way with ‘’, ‘’ and ‘ENTER’ keys. After item change is finished, if ‘ESC’ or other function keys are pressed, it asks for confirmation before Page 66 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 67: Instantaneous Time Ocr
OCR setup screen as in Figure 6.9 appears in the LCD. The setup content of each row is explained in Table 6.3. If the delay time is set more than 0.05s at instantaneous time OCR, OCR has definite time characteristic. ⓒ 2006 Rootech Inc. All Rights Reserved Page 67...
Page 68: Nsocr Setup
Function disable, the relay function is not in operation. Trip Generates trip signal for the circuit breaker (Trip, OFF) when fault occurs in NSOCR. Alarm Generates alarm (BZON:B12, BZONG:B13) (ON) signal when fault occurs in NSOCR. Page 68 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 69: Inverse Time Nsocr
‘’, ‘’ keys. For ‘NSOCR Inv’ or ‘Curve’ items, the selected setup values are changed, and for ‘Pickup’ or ‘TD’ items, the setup value of the number is increased or decreased. ⓒ 2006 Rootech Inc. All Rights Reserved Page 69...
Page 70: Figure 6.12 Status Where The Partial Cursor Appears For Change
‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds as in Figure 6.16, and doesn’t do initialization. Figure 6.14 Confirmation of setup value change Page 70 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 71: Instantaneous Time Nsocr
0.05 ~ 60.00 s by the step of 0.01 s, 0.05s: Instantaneous time operation More than 0.05s: Definite time operation The method of changing and setup each item is the same as one explained for the inverse time NSOCR. ⓒ 2006 Rootech Inc. All Rights Reserved Page 71...
Page 72: Ocgr Setup
‘ENTER’ key, the inverse time OCGR setup screen as in Figure 6.19 appears in the LCD. The setup content of each row is explained in Table 6.8. Figure 6.19 Inverse time OCGR setup screen Page 72 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 73: Figure 6.20 Status Where The Partial Cursor Appears For Change
If the ‘ENTER’ key is pressed, the partial cursor turns into the line cursor while keeping the changed value as in Figure 6.21. Figure 6.21 Status after setup item is changed and ‘ENTER’ key is pressed ⓒ 2006 Rootech Inc. All Rights Reserved Page 73...
Page 74: Definite Time Ocgr
6.18 and then press ‘ENTER’ key. If definite time OCGR is selected by pressing ‘ENTER’ key, the definite time OCGR setup screen as in Figure 6.25 appears in the LCD. The setup content of each row is explained in Table 6.9. Figure 6.25 Definite time OCGR setup screen Page 74 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 75: Instantaneous Time Ocgr
Can be changed and set by the step of 0.1A between 1.0 ~ 50.0A. Instantaneous time characteristic, when fault occurs, is in operation within less than 50ms. The method of changing and setup each item is the same as one for inverse time OCGR. ⓒ 2006 Rootech Inc. All Rights Reserved Page 75...
Page 76: Ovr Setup
Figure 6.27. If definite time OVR is selected by pressing ‘ENTER’ key, the definite time OVR setup screen as in Figure 6.28 appears in the LCD. The setup content of each row is explained in Table 6.12. Figure 6.28 Definite time OVR setup screen Page 76 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 77: Figure 6.29 Status Where The Partial Cursor Appears For Change
Figure 6.31. In this case, if ‘Save’ is selected with the ‘ENTER’ key, the definite time OVR characteristic is initialized to the changed setup value, and shows ‘Setup ⓒ 2006 Rootech Inc. All Rights Reserved Page 77...
Page 78: Instantaneous Time Ovr
OVR setup screen appears in the LCD as in Figure 6.34. The setup content of each row is explained in Table 6.13. Figure 6.34 Instantaneous time OVR setup screen Page 78 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 79: Nsovr Setup
To set NSOVR, press 'OVR' key. when the 'OVR' key is pressed, the OVR setup initial screen appears on the third row as Figure 6.35. It is possible to know what status definite time characteristic is already set to. The Accura 7500 provides only definite time characteristics for NSOVR. Figure 6.35 OVR setup initial screen The meanings of ‘OFF’, ‘Trip’, Alarm’, ‘T&A’...
Page 80: Definite Time Nsovr
‘Pickup’ or ‘Delay’ items, the setup value of the number is increased or decreased. Figure 6.37 Status where the partial cursor appears for change Page 80 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 81: Figure 6.38 Status In Which 'Enter' Key Was Pressed After Changing Setup Items
‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds as in Figure 6.41, and doesn’t do initialization. Figure 6.39 Setup value change confirmation screen Figure 6.40 Notifying change is completed Figure 6.41 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 81...
Page 82: Por Setup
POR Setup When the ‘POR’ key is pressed, the POR setup initial screen appears immediately as in Figure 6.42. It shows what status definite time characteristic is already set to. Accura 7500 provides only definite time characteristic for POR. Figure 6.42 POR setup initial screen The meanings of ‘OFF’, ‘Trip’, Alarm’, ‘T&A’...
Page 83: Figure 6.44 Status Where The Partial Cursor Appears For Change
After item change is finished, if ‘ESC’ or other function keys are pressed, it asks for confirmation before initialization to the changed setup values as in Figure 6.46. In this case, if ‘Save’ is selected with the ‘ENTER’ ⓒ 2006 Rootech Inc. All Rights Reserved Page 83...
Page 84: Uvr Setup
When the ‘UVR’ is pressed, the UVR setup initial screen appears immediately as in Figure 6.49. It shows what status definite time and instantaneous time characteristic is already set to. Accura 7500 provides only definite time for UVR. However, when the delay time is set to 0.05 seconds, instantaneous time characteristics can be obtained and 3 definite time characteristics can be provided, so that it can be used for various purposes such as alarm.
Page 85: Definite Time Uvr
Table 6.19 Definite time UVR setup item Display Content UVR Def.n Select among OFF, trip, alarm, T&A and Test. The meaning of each setup mode is explained in Table 6.18 (n: 1, 2,3) ⓒ 2006 Rootech Inc. All Rights Reserved Page 85...
Page 86: Figure 6.51 Status Where The Partial Cursor Appears For Change
In the status in Figure 6.52, change of other items can be done in the same way with ‘’, ‘’ and ‘ENTER’ keys. After item change is finished, if ‘ESC’ or other function keys are pressed, it asks for confirmation before Page 86 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 87: Other Uvr Setup
‘ENTER’ key. If other UVR setup is selected by pressing ‘ENTER’ key, the Other UVR setup screen as in Figure 6.56 appears in the LCD. The setup content of each row is explained in Table 6.20. Figure 6.56 Other UVR setup screen ⓒ 2006 Rootech Inc. All Rights Reserved Page 87...
Page 88: Motor Protection Elements Setup
6.57. It shows what the characteristics of the MOTOR protection elements are already set to. In addition to NSOCR and NSOVR, the Accura 7500 provides THR, lock, motor start and under current protection as in this menu. Since there are mutually related setup items between each protection elements, it is necessary to check exactly the meaning of each setup item and the appropriate value should be set.
Page 90: Figure 6.60 Status Where The Partial Cursor Appears For Change
‘’, ‘’ key and 'ENTER' key again. To confirm or change the fifth item, press and hold the ‘’ key to move one row at a time as shown in Figure 6.62. Page 90 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 91: Figure 6.62 Lcd Screen With Fifth Row Content
Cancelled!' message for 2 seconds and does not initialize as shown in Figure 6.65. Figure 6.63 Setup value change confirmation screen Figure 6.64 Notifying change is completed Figure 6.65 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 91...
Page 92: Lock
6.67 appears on the LCD. Since the motor start protection element has 7 setup items, the fifth item should be moved downward with ‘’ key. Table 6.24 describes the setup contents of each row. Page 92 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 93: Figure 6.67 Motor Start Protect Element Setup Initial Screen
Since this function is not a function through accurate verification of various motors, it should be applied only when it is necessary in the field The method to change each item is the same as described in THR. ⓒ 2006 Rootech Inc. All Rights Reserved Page 93...
Page 94: Under Current
If 'CB' is selected, it is always monitored when CB status is ON. Can be selected and set to 'Current', or 'CB'. The method to change each item is the same as described in THR. Page 94 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 95: Ovgr Setup
When the ‘OVGR’ key is pressed, the OVGR setup initial screen appears immediately as in Figure 6.69. It shows what status definite time and instantaneous time characteristic is already set to. Accura 7500 provides only definite time and instantaneous time characteristic for OVGR.
Page 96: Figure 6.71 Status Where The Partial Cursor Appears For Change
OVGR characteristic is initialized to the changed setup value, and shows ‘Setup Completed!’ for 2 seconds as in Figure 6.74. If ‘Cancel’ is selected with the ‘ENTER’ key, it returns to the value Page 96 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 97: Instantaneous Time Ovgr
OVGR setup screen appears in the LCD as in Figure 6.76. The setup content of each row is explained in Table 6.28. Figure 6.76 Instantaneous time OVGR setup screen ⓒ 2006 Rootech Inc. All Rights Reserved Page 97...
Page 98: Sgr Setup
When the ‘SGR’ key is pressed, the SGR setup initial screen appears immediately as in Figure 6.77. It shows what status SGR is already set to. Accura 7500 provides only definite time characteristic for SGR. Figure 6.77 SGR setup initial screen The meanings of ‘OFF’, ‘Trip’, Alarm’, ‘T&A’...
Page 99: Definite Time Sgr
Then, the partial cursor appears over the part where the change is to be done. Here, the setup value can be changed by using ‘’, ‘’. For ‘SGR Def.n’ or ‘GR Def.’ items, the selected setup value is changed, and for ⓒ 2006 Rootech Inc. All Rights Reserved Page 99...
Page 100: Figure 6.79 Status Where The Partial Cursor Appears For Change
2 seconds as in Figure 6.82. If ‘Cancel’ is selected with the ‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds as in Figure 6.83, and doesn’t do initialization. Figure 6.81 Setup value change confirmation screen Figure 6.82 Notifying change is completed Page 100 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 101: Fault Reset
To view past records from the recent record, please press the ‘’ key when the partial cursor is over the event record number. If the ‘’ key is pressed, a screen with a number lower than the current screen by one appears as in Figure 6.85. ⓒ 2006 Rootech Inc. All Rights Reserved Page 101...
Page 102: Figure 6.85 A Screen Numbered One Lower Than The Current Event Record Number
Figure 6.86 The screen after the ‘ENTER’ key is pressed in the event record Figure 6.87 The screen while ‘’ key is pressed in the event record screen The above record content can be downloaded to a PC through serial communications for analysis. Page 102 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 103: Chapter 7. Checking Relay Status
The total number of switchs is represented by the sum of the number of trips by fault and the number of switchs by ‘CB CLOSE’ and ‘CB OPEN’ commands. Program Version Shows the software version and hardware version of the relay. ⓒ 2006 Rootech Inc. All Rights Reserved Page 103...
Page 104: Voltage
GPT and zero sequence current. Ia1, Ia2 and Ia0 are symmetrical coordinates internally calculated from the phase current, representing positive sequence, negative sequence and zero sequence current. Iamax, Ibmax, Icmax, Igmax and Izmax are the maximum current values so far. %loadA, %loadB and %loadC are (each Page 104 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 105: Di Status
Shows the current status of the 10 DO channels. If the contactor wired to DO is closed, it’s displayed as ‘Closed (I)’, and if the contactor is open, it’s displayed as ‘Open (O)’. Event record ⓒ 2006 Rootech Inc. All Rights Reserved Page 105...
Page 106: Cb Counter
‘Total’ represents the sum of the number of trips by fault and the num of switches by the ‘CB CLOSE’ and ‘CB OPEN’ commands, and the display range is 0 ~ 60,000 times. If ‘Total’ exceeds the Page 106 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 107: Program Version
Program version display screen as in Figure 7.8. This menu has no other items to show and no setup item, so the line cursor doesn’t appear in the screen. Figure 7.8 Program version display screen ⓒ 2006 Rootech Inc. All Rights Reserved Page 107...
Page 108: Figure 8.1 Setup Initial Screen
Date Setup Set date and time. DO with DI Set the function to control DO set in conjunction with DI input status Page 108 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 109: Passcode
Enter the four numbers in this way. If the entered passcode doesn’t match the currently set passcode, ‘Passcode Change Cancelled!’ appears as in Figure 8.5 for 2 seconds and then the upper menu screen appears. ⓒ 2006 Rootech Inc. All Rights Reserved Page 109...
Page 110: Figure 8.5 Passcode Mismatch Message Screen
‘Passcode Change Cancelled!’ appears for 2 seconds and the existing passcode is maintained. The screen moves to the upper menu screen after the 2 seconds. Figure 8.6 ‘Passcode Change Completed!’ message screen Page 110 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 112: Figure 8.9 Status Where 'Enter' Key Is Pressed After Selecting The Item To Be Deleted
(reset). If ‘All Record’ is configured as ‘Y’ and ‘Save’ is selected by ‘ENTER’ key, all the three items above are deleted (reset). Figure 8.10 Setting value change confirmation screen (Confirm deletion of record) Figure 8.11 Notifying change is completed Figure 8.12 Notifying change is cancelled Page 112 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 113: Din Setup
RemoteMode Set samong None and DIN1 ~ DIN10. If an input is applied to the set digital channel, Accura 7500 operates in remote status. In addition, it maintains the remote status regardless of the ‘Remote’ and‘Local’ key operation of the front panel.
Page 114: Figure 8.14 Status Where Change Can Be Done With The Partial Cursor
If the ‘ENTER’ key is pressed, the partial cursor turns into the line cursor in the status where the changed value is kept as in Figure 8.15. Page 114 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 115: Figure 8.15 Status In Which 'Enter' Key Was Pressed After Changing Setup Items
‘Setup Cancelled!’ for 2 seconds, as in Figure 8.18, and doesn’t do initialization. Figure 8.16 Setup value change confirmation screen Figure 8.17 Notifying change is completed Figure 8.18 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 115...
Page 116: Do Setup
Accura 7500 User Guide DO Setup Accura 7500 has 10 auxiliary contactors, 1 alarm contactor, 2 circuit breaker ON/OFF contactors, and each contactor can be set separately. To set DO (Digital Output: digital output), press ‘ENTER’ key when the line cursor is over the fourth row in the Setup initial screen as in Figure 8.1.
Page 117: Figure 8.20 Status Where The Partial Cursor Appears For Change
Figure 8.20 Status where the partial cursor appears for change If the setup value is changed with ‘’, ‘’ keys and ‘ESC’ key is pressed, it returns to the initial setup value ⓒ 2006 Rootech Inc. All Rights Reserved Page 117...
Page 118: Do Related With Relay
‘Setup Cancelled!’ for 2 seconds, as in Figure 8.24, and doesn’t do initialization Figure 8.22 Setup value change confirmation screen Figure 8.23 Notifying change is completed Figure 8.24 Notifying change is cancelled DO related with Relay Page 118 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 119: Figure 8.25 Do With Relay Setup Screen
The value set as DOUTx is output during the operation of UVR2. Can be set among None and DOUT1~DOUT10. UVR3 The value set as DOUTx is output during the operation of UVR3. Can be set among None and DOUT1~DOUT10. ⓒ 2006 Rootech Inc. All Rights Reserved Page 119...
Page 120: Figure 8.26 Status Where The Partial Cursor Appears For Change
If the setup value is changed with ‘’, ‘’ keys and ‘ESC’ key is pressed, it returns to the initial setup value and the partial cursor turns into the line cursor. If the ‘ENTER’ key is pressed, the partial cursor turns into the Page 120 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 121: Figure 8.27 Status In Which 'Enter' Key Was Pressed After Changing Setup Items
‘Setup Cancelled!’ for 2 seconds, as in Figure 8.30, and doesn’t do initialization. Figure 8.28 Setup value change confirmation screen Figure 8.29 Notifying change is completed Figure 8.30 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 121...
Page 122: Do Control
Accura 7500 User Guide DO Control Accura 7500 has 10 auxiliary contactors, 1 alarm contactor and 2 circuit breaker ON/OFF contactors. Since the circuit breaker can be controlled with ‘CB ON’ and ‘CB OFF’ on the front panel, this menu can control the alarm contactor and 10 auxiliary output contactors.
Page 123: Figure 8.32 Status Where The Partial Cursor Appears For Change
Figure 8.33 Status were ‘ENTER’ key was pressed after control item change. In the status of Figure 8.33, other channels can also be controlled in the same way with ‘’, ‘’ and ‘ENTER’ keys. ⓒ 2006 Rootech Inc. All Rights Reserved Page 123...
Page 124: Lcd Setup
The LCD of Accura 7500 has a background screen that enables viewing data on the screen even after the backlight is turned off. Also this time is the same as the passcode disable time (software lock disable time), i.e., the passcode will be locked...
Page 125: Figure 8.36 Status In Which 'Enter' Key Was Pressed After Changing Setup Items
‘Setup Cancelled!’ for 2 seconds, as in Figure 8.39, and doesn’t do initialization. Figure 8.37 Setup value change confirmation screen Figure 8.38 Notifying change is completed Figure 8.39 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 125...
Page 127: Figure 8.41 Status Where The Partial Cursor Appears For Change
Completed!’ for 2 seconds as in Figure 8.44. If ‘Cancel’ is selected with the ‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds, as in Figure 8.45, and doesn’t do initialization. Figure 8.43 Setup value change confirmation screen Figure 8.44 Notifying change is completed ⓒ 2006 Rootech Inc. All Rights Reserved Page 127...
Page 128: Figure 8.45 Notifying Change Is Cancelled
Chapter 8. Relay General Function Setup Accura 7500 User Guide Figure 8.45 Notifying change is cancelled Page 128 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 129: Cb Failure(Fault Detection)
‘’, ‘’ keys. For ‘Pickup’ or ‘Delay’ items, the setup value of the number is increased or decreased, and for ‘Function’ or ‘Aux Relay’ items, the selected setup value is changed. ⓒ 2006 Rootech Inc. All Rights Reserved Page 129...
Page 130: Figure 8.47 Status Where The Partial Cursor Appears For Change
Completed!’ for 2 seconds as in Figure 8.50. If ‘Cancel’ is selected with the ‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds, as in Figure 8.51, and doesn’t do initialization. Figure 8.49 Setup value change confirmation screen Page 130 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 131: Figure 8.50 Notifying Change Is Completed
Accura 7500 User Guide Chapter 8. Relay General Function Setup Figure 8.50 Notifying change is completed Figure 8.51 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 131...
Page 132: Protection Blocking Function
Can be set among None and DOUT1 ~ DOUT10. If ‘None’, the auxiliary contactor output is not selected. When this function is operational, Select the auxiliary contactor to be operated in relation to this function. Page 132 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 133: Figure 8.53 Status Where The Partial Cursor Appears For Change
If the ‘ENTER’ key is pressed, the partial cursor turns into the line cursor in the status where the changed values are kept as in Figure 8.54. Figure 8.54 Status in which ‘ENTER’ key was pressed after changing setup items ⓒ 2006 Rootech Inc. All Rights Reserved Page 133...
Page 134: Figure 8.55 Setup Value Change Confirmation Screen
‘Setup Cancelled!’ for 2 seconds, as in Figure 8.57, and doesn’t do initialization. Figure 8.55 Setup value change confirmation screen Figure 8.56 Notifying change is completed Figure 8.57 Notifying change is cancelled Page 134 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 135: Date Setup
‘ENTER’ key, then the partial cursor will appear on the last slot [date] of the new date as in Figure 8.59. Then, the content can be changed with ‘’, ‘’ keys. The number of digit will change if ‘’ or ‘’ keys are pressed for 2 seconds. ⓒ 2006 Rootech Inc. All Rights Reserved Page 135...
Page 136: Figure 8.59 Status Where The Partial Cursor Appears For Change
Figure 8.60 Status in which ‘ENTER’ key was pressed after changing setup items In the status of Figure 8.60, time can be changed in the same way as changing the date with ‘’, ‘’ keys and the ‘ENTER’ key. Page 136 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 137: Do Related With Di
DI7 Type The same as ‘DI1 Type’ item. DI8 with The same as ‘DI1 with’ item. DI8 Type The same as ‘DI1 Type’ item. DI9 interlocked The same as ‘DI1 with’ item. ⓒ 2006 Rootech Inc. All Rights Reserved Page 137...
Page 138: Figure 8.62 Status Where The Partial Cursor Appears For Change
Figure 8.65. If ‘Cancel’ is selected with the ‘ENTER’ key, it returns to the value before the change, showing ‘Setup Cancelled!’ for 2 seconds, as in Figure 8.66, and doesn’t do initialization. Page 138 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 139: Figure 8.64 Setup Value Change Confirmation Screen
Accura 7500 User Guide Chapter 8. Relay General Function Setup Figure 8.64 Setup value change confirmation screen Figure 8.65 Notifying change is completed Figure 8.66 Notifying change is cancelled ⓒ 2006 Rootech Inc. All Rights Reserved Page 139...
Page 140: Chapter 9. Protection Relay Characteristic
Chapter 9. Protection Relay Characteristic Inverse Time Curve Characteristic In Accura 7500, the protection elements having inverse time curve characteristic is OCR[51P], NSOCR[46] and OCGR[51G]. The setup for these elements having inverse time curve characteristic are all the same. Protection relay setup are explained in detail in ‘Chapter 6.
Page 141: Kepco Curves
�� , ��, �� = constant defined in the specification Table 9.2 KEPCO Curve constant �� Curve KEPCO Normal Inverse 0.11 0.42 0.020 KEPCO Very Inverse 39.85 1.084 1.950 ⓒ 2006 Rootech Inc. All Rights Reserved Page 141...
Page 142 1.647 1.882 2.117 2.353 2.823 19.0 0.115 0.231 0.462 0.692 0.923 1.154 1.385 1.616 1.846 2.077 2.308 2.770 20.0 0.113 0.227 0.453 0.680 0.907 1.134 1.360 1.587 1.814 2.041 2.267 2.721 Page 142 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 144 0.556 0.635 0.715 0.794 0.953 19.0 0.038 0.075 0.150 0.225 0.300 0.375 0.450 0.525 0.600 0.675 0.750 0.900 20.0 0.036 0.071 0.142 0.213 0.284 0.355 0.426 0.497 0.568 0.639 0.711 0.853 Page 144 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 146 0.173 0.198 0.223 0.248 0.297 19.0 0.011 0.022 0.044 0.067 0.089 0.111 0.133 0.156 0.178 0.200 0.222 0.267 20.0 0.010 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.201 0.241 Page 146 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 148 4.941 5.647 6.353 7.059 8.471 19.0 0.333 0.667 1.333 2.000 2.667 3.333 4.000 4.667 5.333 6.000 6.667 8.000 20.0 0.316 0.632 1.263 1.895 2.526 3.158 3.789 4.421 5.053 5.684 6.316 7.579 Page 148 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 150 1.588 1.815 2.042 2.268 2.722 19.0 0.112 0.223 0.447 0.670 0.893 1.117 1.340 1.563 1.787 2.010 2.233 2.680 20.0 0.110 0.220 0.440 0.660 0.881 1.101 1.321 1.541 1.761 1.981 2.201 2.642 Page 150 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 152 0.859 0.981 1.104 1.227 1.472 19.0 0.061 0.121 0.242 0.364 0.485 0.606 0.727 0.849 0.970 1.091 1.212 1.455 20.0 0.060 0.120 0.240 0.360 0.480 0.600 0.720 0.840 0.960 1.080 1.200 1.440 Page 152 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 154: Selective Ground Relay (Sgr) Characteristic
However, in the wiring diagram provided for Accura 7500, the polarity of Vo is not wired reversely. Therefore, when GPT is connected as in the wiring diagram, the reference voltage is Vo, and so MTA must be set as 210°...
Page 155: Instantaneous Time, Definite Time Characteristic
50ms, there’s no need to set time, and in the case of definite time characteristic, delay time needs to be set. For Accura 7500, the protection elements having both the instantaneous time and definite time protection characteristic is OCR[50P], OCGR[50G], OVR[59], UVR[27], and OVGR[64]. The setup for these instantaneous time and definite time protection elements are the same.
Page 156: Thr Characteristic
= Overload factor �� = Relay Input Current The graph shows a curve with Ip = 0.0 (that is, the thermal accumulation value = 0) in Fig 9.8. Figure 9.8 THR Thermal Curve Page 156 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 158 0.69 16.00 0.15 0.17 0.19 0.23 0.28 0.34 0.40 0.46 0.53 18.00 0.12 0.13 0.15 0.19 0.22 0.27 0.31 0.36 0.42 20.00 0.10 0.11 0.12 0.15 0.18 0.22 0.25 0.29 0.34 Page 158 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 159 0.05 0.08 0.10 0.13 0.16 0.19 0.23 0.26 0.29 18.00 0.02 0.04 0.06 0.08 0.10 0.13 0.15 0.18 0.21 0.23 20.00 0.02 0.03 0.05 0.07 0.08 0.10 0.12 0.14 0.17 0.19 ⓒ 2006 Rootech Inc. All Rights Reserved Page 159...
Page 160 0.09 0.12 0.15 0.18 0.21 0.24 0.27 0.30 0.34 18.00 0.05 0.07 0.10 0.12 0.14 0.16 0.19 0.21 0.24 0.27 20.00 0.04 0.06 0.08 0.09 0.11 0.13 0.15 0.17 0.19 0.22 Page 160 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 161 0.13 0.16 0.19 0.22 0.25 0.28 0.31 0.34 0.38 18.00 0.09 0.11 0.13 0.15 0.17 0.20 0.22 0.25 0.27 0.30 20.00 0.07 0.09 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 ⓒ 2006 Rootech Inc. All Rights Reserved Page 161...
Page 162: Motor Starting Characteristic
If the current drops below 10% of the motor rated current, the motor will be acknowledged to be in a stop state and this protection element will be a condition that can protect the next start state. Page 162 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 163: Chapter 10. Setup Examples
Chapter 10. Setup Examples Automatic Power Recovery Function Setup For Accura 7500, in case of blackout, after the circuit breaker(CB) is turned OFF(OPEN), the setup for sequential ON(CLOSE) from the upper feeder CB when power is recovered must be appropriately set in [UVR] and the [Setup >...
Page 164 To do so, for example, there’s a design that puts the ‘Auto’ and ‘Manual’ selection switch on front panel of the switchboard, and if ‘Manual’ is selected, the voltage is not applied to the corresponding digital input terminal Page 164 ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 165: Precautions
(power recovery). That is, the CB is closed only when UVR is operational, UVR is recovered (Fault Reset), Accura 7500 is in ‘Remote’ state, and signal is applied to the DIN channel set in the [Setup > DIN Setup > UVRrestore] menu.
Page 169: Sequence Diagram
If the CB control output (CBON, CBONG, CBOFF , CBOFFG) and circuit breaker (CB) are directly wired and used, it is recommended that the wiring is made through the auxiliary relay because the internal contactors of Accura 7500 may deteriorate and burn out. ⓒ 2006 Rootech Inc. All Rights Reserved...
Page 170 ⓒ 2006 Rootech Inc. All Rights Reserved Accura EMeter, Accura 2300S/2350, Accura 2700/2750, Accura 3000/3300S/3300, Accura 3500S/3500, Accura 3550S/3550, Accura 3700, Accura 5500, Accura 7500 are trademarks of Rootech Inc. Contact rootech for detailed specifications and order information.

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