Siemens SCOR Installation, Operation & Maintenance Instructions Manual
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Siemens SCOR Installation, Operation & Maintenance Instructions Manual

Siemens SCOR Installation, Operation & Maintenance Instructions Manual

Overcurrent protective relay
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SIEMENS
SCOR Overcurrent
Protective Relay
I . J T a p
A
D F
H
G
E
, ,
Manual No. SG-9228-01
Funct i o n
AB C
1-lll-1
B
Ll . -1 =I
C
Time
lnst. 1
Dat a
I
1
I
A
B
c
Instruction
Installation
Operation
Maintenance
Hardware
3.11
Software
3.40

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  • Page 1 SIEMENS Instruction SCOR Overcurrent Installation Operation Protective Relay Maintenance Hardware 3.11 Software 3.40 Funct i o n Dat a I . J T a p AB C 1-lll-1 Ll . -1 =I Time lnst. 1 Manual No. SG-9228-01...
  • Page 2 fill fill M edium voltage switchgear with AccessTM system field devices...

  • Page 3: General Information

    The available charac­ teristic curves include one definite time, six inverse time, and The SCOR relay is utility grade and is provided in a draw-out case nine IZT curves. (Refer to Table 4.) with built -in test facilities.
  • Page 4 The desired instantaneous overcurrent pickup values for phase and for ground are entered via the data entry controls at the front This standard feature of the SCOR relay allows the ground panel. (This can also be done remotely by the data link if the element to be enabled or disabled on the timed and INST 1 communications option is present.
  • Page 5 The RS-485 port provides for intercommunication between the 1 .8 Auxiliary Output Relay (Option 1 -2) relay and a Siemens Power Monitor unit or a computer running the Power Monitor PC software. Communication is provided This option includes an additional target identified as "INST 2/ over a shielded twisted pair cable at distances of up to 4000 feet.

  • Page 6: Breaker Failure

    1 General Information Page 4 Style Number Identification Chart for Siemens SCOR Relay � [i] D - � D D D � SCOR Power Supply ® Single-Phase Current N.O. Contacts None None ® Three-Phase Current 125 Vdc/120 Vac One lnst. Element...
  • Page 7 Table 1 . Available Characteristics output contacts for tripping the breaker are standard , so output Option E is the third character. The fourth and fifth characters are Timing Option Z5, which is standard on the SCOR relay. This Figure Number...

  • Page 8: Controls And Indicators

    2 Controls and Indicators Page 6 General shows the front panel of the SCOR relay with all the Figure 3 in primary kilo amperes. The Time Target and Element Target options installed except Option 1-2. All of the front panel...
  • Page 9 2 Controls and Indicators Page 7 Table 2. Controls and Indicators Locator Name Function PHASE TAP selector A ten-position switch that provides an incremental adjustmen t of the current pickup tap for all of the phases (simultaneously). The switch positions are defined for both HIGH and LOW range in a table printed on the front panel ( locator of Figure 3).
  • Page 10 2 Controls and Indicators Page S Table 2. Controls and Indicators (continued) Locator Name Function Provides interconnection for any RS-232 device that is to be used for RS232 PORT (Supplied with the communications reading and/or changing data in the relay registers when the option) communication option is supplied.
  • Page 11 2 Controls and Indicators Page 9 Table 2. Controls and Indicators (continued) Locator Name Function POWER indicator Red LED that illuminates when relay power supply is functioning. TARGET RESET switch Raising this switch simultaneously resets all of the targets (locators N and P) if relay is powered up.

  • Page 12: The Configuration Mode

    For more infor m ation on controlling the SCOR relay from a remote computer, see Section 8.8 in Appendix...
  • Page 13 3 Operation by Front Panel Page Table 3. Co ra ti o Mode Display Sequence Register Register Display Display Register Register Sequence Abbreviation Function Range [onF Mode selection window Rddr Indicates the present Address of the relay 0001 to 0254 b RUd Selected bAUd rate See text...
  • Page 14 1 9, 200 1 9. 20 SCOR via its RS-485 port on the back of the case. The number must be selected such that it is unique among all devices connected on the same RS-485 loop (multiple devices may be 9,600 9.600...
  • Page 15 CTs. The relative turns ratio of the CTs is the remaining registers can be more easily configured expressed as a fraction whose denominator is 5. using the Power Monitor unit. Refer to Siemens Power Monitor™ Display and Monitoring Unit (Manual SG-401 8-01 ).
  • Page 16 If not at advise the Siemens Customer Service representative of the Demand Period register. (The latter is not accessible from the front-panel display.) The displayed average is recalculated each reading.
  • Page 17 3 Operation by Front Panel Page 15 Then: Set Phase Tap Switch (Front Panel) on C Setting The Relay (Example) = Tap D - Tap C =1 .00 Span Difference =Pickup value - Tap C =0.70 Example Defined 3.4.1 Tap Cal value (phase) = Difference/Span x 1 00 0 .70 /1 .00 1 00 = 70...
  • Page 18 3 Operation by Front Panel Page 1 6 Load b6 into the phase Curve Type register, and b5 into the ground Curve Type register. Enter 7 0 into the phase Tap Cal register, and 20 into the ground Tap Cal register. Enter 4.7 into the phase instantaneous #1 overcurrent register, and 4 .

  • Page 19: Installation And Testing

    When the relay is to be The SCOR relay is supplied in a standard S1 size drawout case. Figure 4 provides the outline dimensions for th is case. The panel placed in service, it is recommended that the verification tests (given later in this section) be performed prior to installation.
  • Page 20 4 Installation and Testing Page 18 .._ __ _ Mounting Panel FRONT VIEW SIDE VIEW Figure 4. Outline Dimensions 5.69 { 1 44 . 5) �(72�) 8.25 8.63 { 219.1) (209. 6 ) 4 .13 4.3 1 : : (1 04.8) (109.5) : -------...
  • Page 21 4 Installation and Testing Page 1 9 BE1-51 SCOR @19@17@15@13@11 1 8 16 14 12 riMED TRIP Overcurrent FOR SENSING (·) INPUT TERMINALS, SOLID-STATE PROTECTIVE RELAY SEE PRECEDING PAGES C��;��s � � (OPTION 1-2) INST 2 COM(+)(- ) COMMAND CLOSE...

  • Page 22: Verification Testing

    While every comprehensive test program should cover all of the above items, the amount oftesting within any category can vary Two test plugs, Siemens p/n 00-871 -854-001 , Basler p/n over a great range. The operational test defined below illustrates 1 0095, or GE p/n XLA 1 2A.
  • Page 23 4 Installation and Testing Page 2 1 NOTE Several proprietary test sets are marketed which combine the current source and timer, and include other features to simplify setup. Preliminary Steps 4. 7.2 With the connecting plugs removed , connect the unit as shown in the following figure numbers: LEGEND Figure...
  • Page 24 4 Installation and Testing Page (Continued) Time Overcurrent Pickup Test 4.7.3 Verify time overcurrent pickup as follows: After performing the above preliminary steps, connect the input current source to terminals 7 and 8 on the relay case (Phase A). Set the PHASE TAP switch to position A. Adjust the input current source to 1 1 of the value shown on the front panel table for TAP A {HIGH or LOW range as...
  • Page 25 4 Installation and Testing Page 23 4.7.4 Timing Test The timing characteristics available by programming the relay are illustrated in Figures A.1 through A.16. Output trip should occur as shown for any given TIME DIAL setting, to within 1 0% or 20 milliseconds (whichever is greater) .
  • Page 26 Select the "Command Close" command in the Power The current applied should be above 71 .25% of the TAP Monitor. For detailed instructions refer to the Siemens value (reference the front panel table}. Power Monitor™ Display and Monitoring Unit (Manual SG- 401 8-01 }.

  • Page 27: Maintenance

    (see Page 20). If the relay fails to Monitor unit after power up, maintains time to a resolution of 0.01 function properly, contact Siemens Customer Service. When second ; however, drift within the clock can be as much as 0.5 returning the relay to the factory, ship the entire relay cradle seconds per day.
  • Page 28 Siemens Isolated Multi-Drop™ RS-232 to RS-485 dard .) Published by Electronic Industries Association (April Converter(Manual No. SG-6048). 1 983). Siemens Power Monitor™ PC User 's Guide (Manual No. Siemens Power Monitor™ Display and Monitoring Unit SG-4028). (Manual No. SG-401 8-01 ) .

  • Page 29: Appendix A T Ime Overcurrent Characteristic Curves

    Appendix A T ime Overcurrent Characteristic Curves Page 21 Figure A.1 through Figure A.16 illustrate the characteristic curves that are programmed into the nonvolatile memory of this relay. Refer to Table 1 on Page 5 for a listing of the 1 6 characteristic curves.
  • Page 30 Appendix A Time Overcurrent Characteristic Curves Page 2s • • • � ::::2: ::::2: . 01 .Oil .Oil . 02 . 01 .5 .1 .7 .I .I • 1 • 1 1 0 .5 .• . 7 • .• I 7 8 t 1 0 MULTIPLES O F PICKUP SETIING MULTIPLES OF PICKUP SETIING...
  • Page 31 Appendix A T ime Overcurrent Characteristic Curves Page 29 � � � � • • • � � � ·• • � •• .• . 7 • a 7 a 1 10 •• .• . 7 •••• 1 � I 7 I 1 1 0 MULTIPLES PICKUP SETIING MULTIPLES...
  • Page 32 Appendix A T ime Overcurrent Characteristic Curves Page 3o � ·. � � -� .Ill . 01 • � • 1 • .I .I .I I 1 1 0 I 110 • .7 .I ..7 .1.1 1 MULTI PLES PICKUP SETIING MULTIPLES...
  • Page 34 Appendix A T ime Overcurrent Characteristic Curves Page 32 • • • � � .� .& �j .CII .CII .jll .CII • .• .• . t 1 I • ..7 . 1 .1 � • 7 • 1 1 0 MULTIPLES OF PICKUP SETIING MULTIPLES PICKUP SETIING...
  • Page 35 Appendix A T ime Overcurrent Characteristic Curves Page 33 • • • � � � � � .• � .. A • 7 • I 7 I .• .• . 1 .1.1 1 MULTIPLES PICKUP SETIING MULTIPLES PICKUP SETIING Figure A.1 2 Timing Type c4: w/Limit 4 Figure A.1 1 Timing Type c3: FT w/Umit 3 (Dwg.
  • Page 36 Appendix A T ime Overcurrent Characteristic Curves Page 34 1011 • • • 'Ill 'Ill • • • • • • � � " " � � - � -�� . 113 •• . 02 .1 .1 I 7 I �...
  • Page 37 Appendix A T ime Overcurrent Characteristic Curves Page 35 1 00 • � � � � � -� -� � .CII .CII .I .I .7 I 7 I .1 .1 1 1 10 I 7 I 1 1 0 • �...
  • Page 38 � � � 40 :::; ; >= SCOR D992-oo7 1 -22-92 :1:: 50 MULTIPLE OF TAP :::; ; >= Figure A.1 7 SCOR Instantaneous Time Curve Phase Timings MULTIPLE OF TAP Figure A.1 8 SCOR Instantaneous Time Curve Ground Timings...

  • Page 39: Appendix B Functional Description Of Operation

    5.0 and 1 1 .00 represent the upper limits ofthe LOW and HIGH B.5.2 RMS Sensing ranges, respectively. The SCOR protective relay uses RMS Sensing, a technology first introduced by Siemens in 1 985, to sample the current wave shape and quickly calculate the effective heating value of the current.
  • Page 40 Appendix B Functional Description of Operation Page 38 of squares algorithm for both determining trip level and for The current inputs are continuously polled and the calculations calculating metered values of the relay current level. The input updated once for every 60 Hz (line) cycle. As long as the sensed waveform is sampled several times to determine instantaneous current is above the pickup point, the elapsed time is accumu­...

  • Page 41: Target Indicators

    Communications Option 8.6.3 Instantaneous and Command Close Options The SCOR relay includes provision for the future addition of the One or two instantaneous outputs are available as options. The optional communication board as standard . If the communica­...
  • Page 42 RS-485 communications. Configuration of the SCOR relay is read and stored by the Power Monitor unit, and the relay can be configured or changed remotely from the Power Monitor unit (except for the tap 8.8.2 Local or Remote with Siemens...

  • Page 43: Appendix C Specifications

    Appendix C Specifications Page 4 1 relay is available in single-phase, three-phase, two­ SCOR phase-with-ground, and three-phase-with-ground configura­ tions, and with the features and c a p a b ilities descri b e d in Table C.1 . Table C.1...
  • Page 44 Includes an RS-232 port on the front panel for local testing and configuration, and an RS-485 port at rear of unit for operation by a Siemens Power Monitor unit at distances up to 4000 feet using baud rates up to 1 9,200.
  • Page 45 Appendix C Specifications Page 43 Table C.1 Specifications (continued) Outputs Output contacts are rated as follows: Resistive: 1 20/240 Vac - Make 30 A for 0.2 seconds, carry 7 A continuously, break 7 A. 250 Vdc - Make and carry 30 A for 0.2 seconds, carry 7 A continuously, break 0.3 A. 500 Vdc - Make and carry 1 5A for 0.2 seconds, carry 7 A continuously, break 0.1 A.
  • Page 46 Appendix C Specifications Page 44 Table C.2 Power Supplies Burden at Nominal Input Voltage Nominal Type Input Voltage Range (Maximum) 48 Vdc 24 to 60 Vdc ?.O W 1 25 Vdc 62 to 1 50 Vdc 8.0 W 1 20 Vac 90 to 1 32 Vac 1 9.0 VA Table C.3 Current Sensing Burden, R and L (R in milliohms, L in microhenries)
  • Page 48 SI E M E N S Siemens E nergy & Automation , Inc. E lectrical Apparatus Division P . O . Box 29503 Raleigh, NC 27626 (91 9) 365-6660 SG-9228-01 8/92 2M PR INTED IN U.S.A.

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