Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Seg HighTECH Line MRN3-3
Summary of Contents for Seg HighTECH Line MRN3-3
- Page 1 MANUAL HighTECH Line PROTECTION TECHNOLOGY MADE SIMPLE MRN3-3 MAINS DECOUPLING RELAY WITH DF/DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS MAINS DECOUPLING RELAY WITH DF/DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS Original document English Revision: A...
-
Page 2: Table Of Contents
Contents 1 Introduction and Application 2 Features and Characteristics 3 Design 5.4.6 Number of measuring repetitions (T) for Connections frequency functions 3.1.1 Analogue input circuits 5.4.7 Threshold of the frequency supervision 3.1.2 Blocking input 5.4.8 Tripping delays for the frequency 3.1.3 External reset input elements... - Page 3 6 Relay Testing and Commissioning Power-On Testing the output relays and LEDs Checking the set values Secondary injection test 6.4.1 Test equipment Example of test circuit 6.5.1 Checking the input circuits and measuring values 6.5.2 Checking the operating and resetting values at over-/undervoltage 6.5.3 Checking the tripping delay of the...
-
Page 4: Introduction And Application
- is of enormous use for the accu- • serial data exchange via RS485 interface possible; rate identification and analysis of the grid state - as alternatively with SEG RS485 Pro-Open Data Proto- demanded by the rules. col or Modbus Protocol. -
Page 5: Design
Design Connections Figure 3.1: Connection diagram MRN3-3 3.1.1 Analogue input circuits 3.1.4 Output relays The analogue input voltages are galvanically decoup- The MRN3-3 is equipped with 5 output relays. Apart led by the input transformers of the device, then filtered from the relay for self-supervision, all protective func- and finally fed to the analogue digital converter. -
Page 6: Fault Recorder
3.1.5 Fault recorder When there is no more storage capacity left, the LED The MRN3-3 has a fault value recorder which records FR starts flashing. the measured analogue values as instantaneous val- ues. The memory part of the fault recorder is designed as The instantaneous values circulating storage. -
Page 7: Order Of Parameter Settings
Order of parameter settings 3.2.1 System parameters Setting parameter Unit Range L1, L2, L3 Transmission ratio of the voltage transformers SEK, 1.01...6500 ∆/Y Input voltage correction depending on the input voltage Y = star transformer connection DELT = Delta Adjustment of the rated frequency 50/60 ∆Θ/df Selection vector surge or df/dt function... - Page 8 Setting parameters Unit Range Char2+U<1+t> 1. Char. point_value 2 (not parameterisable) 0s fixed Char2+U<2 2. Char. point_value 1 (voltage value) >= U<1–200*/ >=U<1–460*/>= U<1–800* Char2+U<2+t> 2. Char. point_value 2 (time value) > U<1+t> - 60s Char2+U<3 3. Char. point_value 1 (voltage value) >= U<2–200*/ >=U<2–460*/>= U2–800*...
-
Page 9: Parameter Related To The Fault Recorder
3.2.3 Parameter related to the fault recorder Setting parameter Unit Range Number of records 1 x 20/1 x 16.66* 1 x 10/1 x 8.33 2 x 10/2 x 8.33 3 x 5/3 x 4.11 4 x 5/4 x 4.11 7 x 2.5/7 x 2.04 8 x 2.5/8 x 2.04 Storage of record, in case of event P_UP = with excitation... -
Page 10: Working Principle
Working Principle Analogue circuits Voltage supervision The input voltages are galvanically isolated by the in- The voltage supervision element of MRN3-3 is used to put transformers. The noise signals caused by inductive protect generators, consumers and other electrical and capacitive coupling are suppressed by an ana- equipment from over-/and undervoltage. -
Page 11: Selection Of Star Or Delta Connection
4.3.1 Selection of star or delta Principle of frequency supervision connection The frequency element of MRN3-3 protects electrical All connections of the input voltage transformers are led to screw terminals. The nominal voltage of the de- generators, consumers or electrical operating equip- vice is equal to the nominal voltage of the input trans- ment in general against over- or underfrequency. -
Page 12: Measuring Of Frequency Gradient
Measuring of frequency gradient Electrical generators running in parallel with the mains, Mains parallel operation and isolated single e.g. industrial internal power supply plants, should be operation: separated from the mains when failure in the intrasys- For this application the vector surge supervision tem occurs for the following reasons: trips the mains circuit breaker. -
Page 13: Measuring Principle Of Vector Surge
To prevent a possible false tripping the vector surge measuring can be blocked at a set low input voltage (refer to 5.4.10). The undervoltage lockout acts faster then the vector surge measurement. Vector surge tripping is blocked by a phase loss so that a VT fault (e.g. - Page 14 ∆U' = I ' jX Mains Figure 4.6: Equivalent circuit at mains failure In case of mains failure or auto re-closing the genera- tor suddenly feeds a very high consumer load. The ro- tor displacement angle suddenly increases and the voltage vector U changes its direction (U ') (Fig.
- Page 15 Application hint Although the vector surge relay guarantees very fast b) Short circuit type loading of the alternators at distant mains failures and reliable detection of mains failures under nearly all operational conditions of mains parallel running al- ternators, the following borderline cases have to be At any distant mains failure, the remaining consumers cause sudden short circuit type loading of the power considered accordingly:...
-
Page 16: Voltage Threshold Value For Frequency
Voltage threshold value for frequency- df/dt measuring At low measuring voltages, e.g. during generator start- up, frequency or df/dt-measuring is perhaps not de- sired. By means of the adjustable voltage threshold value <, functions f or df/dt are blocked if the meas- ured voltage falls below the set value. -
Page 17: Operation And Settings
Operation and Settings Display Function Display shows Pressed pushbutton Corresponding LED SEG Normal operation Measured operating values Actual measured value <SELECT/RESET> one time L1, L2, L3, Min. and max. values of for each value f, min, max ∆Θ/df voltage, frequency and vector surge and df/dt Transformer ratio of the CT’s... - Page 18 <TRIP> three times Inquire password PSW? <SELECT/RESET>/ <+>/<->/<ENTER> Relay tripped TRIP <TRIP> or fault tripping Secret password input XXXX <SELECT/RESET>/ <+>/<->/<ENTER> SEG System reset <SELECT/RESET> for about 3 s only Modbus Table 5.1: Possible indication messages on the display TD_MRN3-3_08.06_GB...
-
Page 19: Setting Procedure
Setting procedure In this paragraph the settings for all relay parameters are described in detail. For parameter setting a pass- word has to be entered first (please refer to 4.4 of de- scription "MR-Digital Multifunctional Relays"). System parameters 5.3.1 Display of residual voltage U as primary quantity (U prim The residual voltage can be shown as primary measur-... -
Page 20: Setting Of Nominal Frequency
5.3.3 Setting of nominal frequency For proper functioning it is necessary to first adjust the This difference in settings is required for the fault re- rated frequency (50 or 60 Hz). corder. If the fault recorder is to be used, the setting must be f = 50 Hz or f = 60 Hz. -
Page 21: Display Of The Activation Storage (Flsh/Nofl)
5.3.4 Display of the activation storage (FLSH/NOFL) If after an activation the existing current drops again With the setting B_S2 the blocking input (D8, E8) is below the pickup value, e.g. U1 (provided, this step used as parameter-set change-over switch. With the was parameterised as under voltage step), without a setting R_S2 the reset input (D8, E8) is used as pa- trip has been initiated, LED U<... -
Page 22: Protection Parameter
Protection parameter 5.4.1 Setting parameters for under voltage characteristics At the moment when the voltage falls below the For the under voltage detection, the MRN3-3 has two under voltage characteristics (limit curves) that can be threshold value U<start, the MRN3-3 will initiate the independently set and that each provide 5 characteris- tripping timer. -
Page 23: Symmetrical, Asymmetrical Or General Faults
5.4.2 SYMmetrical, ASYMmetrical or GENEral faults* Besides the warning and tripping function the U- ASYM means asymmetrical fault: If this function is as- characteristic has a further special feature. As for the signed to an under-voltage characteristic and the tripping criterion it can be selected whether the char- MRN3-3 detects a symmetrical fault, then tripping will acteristic should react to a symmetrical an asymmetri- be blocked. -
Page 24: Permissible Release Time For The Under Voltage Characteristic Curve
5.4.3 Permissible release time for the under voltage characteristic curve The end of the failure incident is detected on condition that the voltage had been above the voltage range for at least the period of setting value t . The characteristic value calculation is interrupted then and any new fal- ling below the starting threshold will be defined as a new failure incident. -
Page 25: Parameter Setting Of The Voltage Functions
5.4.5 Parameter setting of the voltage 5.4.7 Threshold of the frequency functions supervision The function of the additional voltage elements is de- The frequency supervision of MRN3 has three fre- termined by means of a separately adjusted value, quency elements independent from each other. Acc. to that either parameterizes the related function as over- setting the pickup value above or below the nominal voltage (U>) or as under voltage (U<). -
Page 26: Parameter Setting Of The Vector Surge
5.4.9 Parameter setting of vector surge supervision or frequency rate of change df/dt By the parameter for selecting the vector surge function Threshold for the vector surge supervision or df/dt supervision it is defined which of the two func- When the pickup value of the vector surge supervision tions is active. -
Page 27: Voltage Threshold Value For Frequency
5.4.10 Voltage threshold value for Adjustment of the fault recorder frequency and vector surge The MRN3-3 is equipped with a fault recorder (see measuring (df/dt) chapter 3.1.5). Three parameters can be determined. Correct frequency measuring or vector surge measur- ing cannot be obtained if the system voltage is very low, for instance during generator start up or voltage 5.5.1 Number of the fault recordings... -
Page 28: Pre-Trigger Time
5.5.3 Pre-trigger time (T By the time T it is determined which period of time prior to the trigger occurrence should be stored as well. It is possible to adjust a time between 0.05s and the max. recording interval (2.5; 4,5; 10 or 20s with 50 Hz and 2.08;... -
Page 29: Additional Functions
The assignment mode can be reached only via the Additional functions blocking mode. By pressing push button <SELECT/RESET> in blocking 5.7.1 Setting procedure for blocking of mode again, the assignment mode is selected. the protection functions and assignment of output relays The LEDs Char1, Char2, U1, U2, U3, f1, f2, f3 and ∆Θ/df light up green when the output relays are as- The blocking function of the MRN3-3 can be set ac-... -
Page 30: Output Relays
Relay function Output relays Display- Corresponding Indication Char1 cycle running _ _ _ _ Char1 green Char1 tripping/warning _ 2 _ _ Char1 green t> red Char2 cycle running _ _ 3 _ Char2 green Char2 tripping/warning 1 _ _ _ Char2 green t>... -
Page 31: Indication Of Measuring And Fault Values
Indication of measuring and fault values 5.8.1 Measuring indication In normal operation the following measuring values Min./max. vector surge measuring : can be displayed. The procedure described above applies also to stor- • Voltages (LED L1, L2, L3 green) age of min./max. values of vector surge measuring. •... -
Page 32: Fault Memory
Fault memory When the relay is energized or trips, all fault data and Recorded fault data: times are stored in a non-volatile memory manner. The MRN3-3 is provided with a fault value recorder for Measuring Displayed value Correspond- max. three fault occurrences. In the event of additional ing LED trippings always the oldest data set is written over. -
Page 33: Reset
5.9.1 Reset All relays offer the following three possibilities to reset the display of the unit as well as the output relay at jumper position J3=ON. Manual Reset • By pressing the push button <SELECT/RESET> for some time (about 3 s) Electrical Reset •... -
Page 34: Relay Testing And Commissioning
Testing the output relays and LEDs Relay testing and commissioning PLEASE NOTE! Prior to commencing this test, interrupt the trip circuit to The following test instructions should help to verify the the circuit breaker if tripping is not desired. protection relay performance before or during commis- sioning of the protection system. -
Page 35: Secondary Injection Test
Secondary injection test 6.4.1 Test equipment • Voltmeter and frequency meter with class 1 or better, • auxiliary power supply with the voltage correspond- ing to the rated data indicated on the type plate, • three-phase voltage supply unit with frequency regu- lation (Voltage: adjustable from 0 to 2 x U ;... -
Page 36: Checking The Input Circuits And Measuring Values
6.5.1 Checking the input circuits and measuring values Apply three voltages with the rated value and gradu- Apply three voltages of rated value to the voltage input circuits (terminals A3 - A8) of the relay. Check the ally increase (decrease) the voltages until the relay measured voltages, frequency and vector surge or starts, i.e. -
Page 37: Checking The Operating And Resetting
6.5.4 Checking the operating and reset ting values of the over-/underfre- quency functions Note: Due to frequency changes, vector surge or df/dt - trip- ping can occur during frequency tests. In order to en- sure a trouble-free test procedure, the vector surge df/dt function of the relay have to be blocked before tests are started. -
Page 38: Checking The Vector Surge Function
6.5.6 Checking the vector surge function ∆Θ − arctg arctg With the help of an advanced relay test equipment a ⋅ ω ⋅ ⋅ ω ⋅ phase shift (vector surge) on the voltage signal can be obtained to test the vector surge function of MRN3 re- Example: R = 1 Ohm, R = 363 Ohm, C = 3 µF lay. -
Page 39: Checking The External Blocking And Reset Functions
6.5.7 Checking the tripping and reset Primary injection test values of the df/dt stages Generally, a primary injection test could be carried out in the similar manner as the secondary injection test The df/dt function can only be tested with a frequency generator which is capable of producing a defined described above. -
Page 40: Technical Data
Technical Data Measuring input circuits Rated data: Nominal voltage U 100 V, 230 V, 400 V, 690 V Nominal frequency f 40 - 70 Hz Measuring range: 0 – 2xUn (100V, 230V, 400V) Measuring range: 0 – 1,16xUN (690V) Measuring accuracy: 1% of the measuring value or 0.3% of the nominal value Power consumption in... -
Page 41: Setting Ranges And Steps
Setting ranges and steps 7.3.1 System parameter Function Para- Setting range Steps/Range Tolerance meter Transformer ratio (SEC) 1.01...6500 0.01 (1,01...2,00) prim 0.02 (2,00...5,00) 0.05 (5,00...10,0) (10,0...20,0) (20,0...50,0) (50,0...100) (100...200) (200...500) (500...1000) (1000...2000) (2000...5000) (5000...6500) ∆/Y ∆ = Delta/Y = Star Switch group Rated frequency f = 50 Hz / f = 60 Hz... - Page 42 Protection parameter (continuation) Function Parameter Setting range Step Tolerance ±1% related to the tU<3 > tU<2...60s 0.02 (0.06...1.00) (U<3+t>) 0.05 (1.00...2.00) measured value of volt- age resp. ±30 ms (2.00...5.00) (5.00...10.0) (see EN60255-3 + (10.0...20.0) rounding error* and (20.0...50.0) frequency influence**) (50.0...60) ±1% from setting value U<4...
- Page 43 (continuation) Protection parameter Function Parameter Setting range Step Tolerance Function of the U< (Under voltage function)/ voltage steps U> (Over voltage function) ±1% from setting value Voltage stages Un = 100 V 1...200 V (EXIT) U1 – U3 Un = 230 V 1…460 V (EXIT) or 0.3% of U Un = 400 V 4...800 V (EXIT) Un = 690 V 4...800 V (EXIT)
-
Page 44: Interface Parameter
7.3.3 Interface parameter Function Parameter Modbus-Protocol RS485 Pro Open Data Protocol Slave-Address 1 - 32 1 - 32 Baud-Rate* 1200, 2400, 4800, 9600 9600 (fixed) Parity* even, odd, no “even Parity” (fixed) Table 7.1: Interface parameter *only Modbus Protocol 7.3.4 Parameters for the fault recorder Function Parameter... -
Page 45: Order Form
Order form Mains decoupling relay MRN3- with voltage back up function according to VDN/e.on voltage (2 flexible voltage time characteristics, 3 standard steps Frequency (3 steps) df/dt-supervision (1 step) and vector surge ( 1 step) Rated voltage 100 V (Utilities Substation/main substation) 230 V (direct connection without transformers 400 V (direct connection without transformers) 690 V (direct connection without transformers) - Page 46 Setting list MRN3-3 Project: SEG job.-no.: Function group: = Location: + Relay code: - Relay functions: Password: Date: All settings must be checked at site and should the occasion arise, adjusted to the object/item to be protected. Setting of the parameters...
- Page 47 Actual Function Unit Default settings settings Set1/Set2 Set1 Set2 U<4 4. Char. point_value 1 85/195/340/586* U<4+t> 4. Char. point_value 2 3.00 U<5 5. Char. point_value 1 (U-voltage band) 85/195/340/586* U<5+t> 5. Char. point_value 2 (End time) 3.00 Permissible release time for characteristic curve 2 0.10 Function of the 1 voltage step...
- Page 48 Parameter for serial interface Actual Function Unit Default settings setting Slave address of the serial interface **Setting of the Baud-Rate 9600 **Parity check even ** only Modbus protocol Assignment of the output relays Function Relay 1 Relay 2 Relay 3 Relay 4 Default Actual...
- Page 49 Setting of code jumpers Code jumper Default Actual Default Actual Default Actual settings settings settings settings settings settings Plugged Not plugged No function Code jumper Low/High-range for Reset input Low/High-range for blockage input Default settings Actual settings Default settings Actual settings Low=plugged High=not plugged...
- Page 50 SEG Electronics GmbH reserves the right to update any portion of this publication at any time. Information provided by SEG Electronics GmbH is believed to be correct and reliable. However, SEG Electronics GmbH assumes no responsibility unless otherwise expressly undertaken.
Need help?
Do you have a question about the HighTECH Line MRN3-3 and is the answer not in the manual?
Questions and answers