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Siemens 7SR21 Manual

Overcurrent relay
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7SR21 Non-Directional
7SR22 Directional
Overcurrent Relay

Document Release History

This document is issue 2010/05. The list of revisions up to and including this issue is:
2010/05
Function diagrams amended, return form removed and typographical revisions.
2010/02
Document reformat due to rebrand
2009/09
Third Issue. Software revision 2435H80004/5 R4b-4
2008/07
Second issue. Software revision 2435H80004/5 R3d-3.
2008/03
First issue

Software Revision History

2009/09
2435H80004/5 R4b-4
2008/07
2435H80004/5R3d-3
2008/03
2435H80004/5R2c-2b
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR21 & 7SR22 Argus Commissioning and Maintenance
CTS-I Supervision. Undercurrent 37G & 37SEF. Vx U/O Voltage. 46BC
U/C. Comms Settings. Waveform Storage Settings. Fault Storage
Settings. Energy Storage. Trip test function. Local/Remote modes.
Settings ranges extended. Protocol changes.
Demand records. Optional DNP3.0 data comms.
First Release

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Summary of Contents for Siemens 7SR21

  • Page 1: Document Release History

    Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.

  • Page 2: Table Of Contents

    7SR21 & 7SR22 Argus Commissioning and Maintenance Contents Document Release History........................1 Software Revision History........................1 Contents ..............................2 Section 1: Common Functions ......................5 1.1 Overview ...........................5 1.2 Before Testing...........................5 1.2.1 Safety ...........................5 1.2.2 Sequence of Tests .......................5 1.2.3 Test Equipment ......................6 1.2.4 Precautions ........................6...
  • Page 3 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.12 Thermal Overload (49)......................44 2.13 Over/Under Voltage ........................46 2.13.1 Phase Under/Over Voltage (27/59)................46 2.13.2 Undervoltage Guard (27/59UVG) ................48 2.13.3 Vx Under/Over Voltage (Vx 27/59) ................49 2.13.4 NPS Overvoltage (47) ....................51 2.13.5 Neutral Overvoltage (59N) ..................53 2.13.6 Definite Time (59NDT) ....................53...
  • Page 4 7SR21 & 7SR22 Argus Commissioning and Maintenance List of Figures Figure 2-1 Directional Phase Fault Boundary System Angles ............15 Figure 2-2 Phase Overcurrent......................16 Figure 2-3 Voltage Controlled Overcurrent ..................19 Figure 2-4 Cold Load...........................21 Figure 2-5 Cold Load Logic diagram....................22 Figure 2-6 Directional Earth Fault Boundary System Angles..............24...

  • Page 5: Section 1: Common Functions

    7SR21 & 7SR22 Argus Commissioning and Maintenance Section 1: Common Functions Overview Commissioning tests are carried out to prove: Equipment has not been damaged in transit. Equipment has been correctly connected and installed. Prove characteristics of the protection and settings which are based on calculations.

  • Page 6: Test Equipment

    7SR21 & 7SR22 Argus Commissioning and Maintenance 1.2.3 Test Equipment Required test equipment is: - Secondary injection equipment with integral time interval meter Primary injection equipment A d.c. supply with nominal voltage within the working range of the relay's d.c. auxiliary supply rating A d.c.
  • Page 7 7SR21 & 7SR22 Argus Commissioning and Maintenance There is an ‘active settings group’ on which the relay operates and an ‘edit/view settings group’ which is visible on the display and which can be altered. This allows the settings in one group to be altered from the relay fascia while the protection continues to operate on a different unaffected group.

  • Page 8: Tests

    7SR21 & 7SR22 Argus Commissioning and Maintenance Tests 1.3.1 Inspection Ensure that all connections are tight and correct to the relay wiring diagram and the scheme diagram. Record any deviations. Check that the relay is correctly programmed and that it is fully inserted into the case. Refer to ‘Section 2: Settings and Instruments’...

  • Page 9: Ac Energising Quantities

    7SR21 & 7SR22 Argus Commissioning and Maintenance AC Energising Quantities Voltage and current measurement for each input channel is displayed in the Instrumentation Mode sub-menus, each input should be checked for correct connection and measurement accuracy by single phase secondary injection at nominal levels.

  • Page 10: Binary Inputs

    7SR21 & 7SR22 Argus Commissioning and Maintenance Binary Inputs The operation of the binary input(s) can be monitored on the ‘Binary Input Meters’ display shown in ‘Instruments Mode’. Apply the required supply voltage onto each binary input in turn and check for correct operation.

  • Page 11: Binary Outputs

    7SR21 & 7SR22 Argus Commissioning and Maintenance Binary Outputs A minimum of six output relays are provided. Two of these have change over contacts, BO2 & BO3, one has a normally closed contact, BO1 and the remainder have normally open contacts.

  • Page 12: Relay Case Shorting Contacts

    7SR21 & 7SR22 Argus Commissioning and Maintenance Relay Case Shorting Contacts CT inputs and terminals B25-B26 (Relay Withdrawn Alarm) are fitted with case mounted shorting contacts which provide a closed contact when the relay is withdrawn from the case. The operation of these contacts should be checked.

  • Page 13: Section 2: Protection Functions

    Section 2: Protection Functions This section details the procedures for testing each protection function of the 7SR21 & 7SR22 relays. These tests are carried out to verify the accuracy of the protection pick-ups and time delays at setting and to confirm correct operation of any associated input and output functionality.

  • Page 14: Phase Directional Polarity Check

    7SR21 & 7SR22 Argus Commissioning and Maintenance It should be considered that where several overlapping elements are used simultaneously, the overall protection operate time may be dependent on the operation of different individual elements at the various levels of applied current or voltage.

  • Page 15: Out Of 3 Logic

    7SR21 & 7SR22 Argus Commissioning and Maintenance Forward Reverse Lag (point C) Lead (point A) Lead(point B) Lag (point D) Pick-up Drop-off Pick-up Drop-off Pick-up Drop-off Pick-up Drop-off MTA-85 MTA+85 MTA-85 MTA-85 Phase A Phase B Phase C With balanced 3-phase system quantities:...

  • Page 16: Phase Overcurrent (67/50,67/51)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Phase Overcurrent (67/50,67/51) Figure 2-2 Phase Overcurrent Voltage Inputs: ), V ), V ) for directional elements. Current Inputs: ), I ), I Disable: 51V, 51C, 46, 49, 50CBF, 79 Map Pickup LED:...

  • Page 17: Definite Time Overcurrent (50)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.2.1 Definite Time Overcurrent (50) If DTL setting is small, gradually increase current until element operates. If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, and check operation Apply 2x setting current if possible and record operating time P.U.
  • Page 18 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.2.2.1 Element Blocking The Phase Overcurrent elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector operation, as well as 79 Autoreclose settings for Inst/Delayed. The Characteristic can be modified by Cold Load (51-n only) and Voltage Controlled Overcurrent and can be made non-directional by VT Supervision.

  • Page 19: Voltage Controlled Overcurrent (51V)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Voltage Controlled Overcurrent (51V) Figure 2-3 Voltage Controlled Overcurrent OC Phase Control Voltage Voltage Inputs: ), V ), V Current Inputs: ), I ), I Disable: 51C, 46, 37, 49, 50CBF, 79 Map Pickup LED: 51-n/50-n - Self Reset Shaped Phase Overcurrent elements 51-n should be tested for pick-up and timing before this function is tested.
  • Page 20 7SR21 & 7SR22 Argus Commissioning and Maintenance Gradually increase the a-b phase current or balanced 3P current until Pickup LED operates. Confirm result of Phase O/C test above. Reduce the applied voltage to a level such that V ) phase-phase voltage is less than 90% of the setting.

  • Page 21: Cold Load (51C)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Cold Load (51C) Figure 2-4 Cold Load Voltage Inputs: ), V ), V ) for directional elements Current Inputs: ), I ), I Disable: 51V, 46, 49, 50CBF, 79 Map Pickup LED: 51-n - Self Reset The CB must be open for more than the Cold Load Pick-up Time to allow testing of this function.

  • Page 22: Inverse Time Overcurrent (51C)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Cold Load Enabled Disabled Pick-up Time & CB Open Drop-off Time See Delayed CB Closed Overcurrent (51-n) 51c-n Setting 51c-n Charact 51c-n Time Mult Reduced 51c-n Delay (DTL) Reduced Current Level Current 51c-n Min. Operate Time...
  • Page 23 7SR21 & 7SR22 Argus Commissioning and Maintenance Calculated Timing values in seconds for TM =1.0 Curve 2 xIs 5 xIs 10.03 4.28 IEC-NI 13.50 3.38 IEC-VI 26.67 3.33 IEC-EI 120.00 30.00 IEC-LTI 3.80 1.69 ANSI-MI 7.03 1.31 ANSI-VI 9.52 1.30...

  • Page 24: Directional Earth Fault Polarity Check (67N)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Directional Earth Fault Polarity Check (67N) Derived Earth Fault, Measured Earth Fault and Sensitive Earth Fault elements can be set as directional. These are polarised from residual voltage, calculated from the 3 phase voltage inputs or the 3Vo input depending on the Phase Voltage Config setting in the CT/VT Config menu.

  • Page 25: Derived Earth Fault (67/50N, 67/51N)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Derived Earth Fault (67/50N, 67/51N) Figure 2-7 Derived Earth Fault Voltage Inputs: ), V ), V Current Inputs: ), I ), I Disable: 37, 46, 49, 60CTS, 50CBF, 60CTS, 46BC, 79 Map Pickup LED:...

  • Page 26: Directional Polarity

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.6.1 Directional Polarity See section Directional Earth Fault Polarity Check above for testing details. Forward Reverse Lag (point C) Lead (point A) Lead(point B) Lag (point D) Pick-up Drop-off Pick-up Drop-off Pick-up Drop-off...
  • Page 27 7SR21 & 7SR22 Argus Commissioning and Maintenance Calculated Timing values in seconds for TM =1.0 Curve 2 xIs 5 xIs 10.03 4.28 IEC-NI 13.50 3.38 IEC-VI 26.67 3.33 IEC-EI 120.00 30.00 IEC-LTI 3.80 1.69 ANSI-MI 7.03 1.31 ANSI-VI 9.52 1.30...
  • Page 28 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.6.3.2 ANSI Reset If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected for an IEC characteristic element, the reset will be instantaneous.

  • Page 29: Measured Earth Fault (67/50G,67/51G)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Measured Earth fault (67/50G,67/51G) Figure 2-8 Measured Earth Fault Voltage Inputs: ), V ), V ) for directional elements Current Inputs: Disable: 50CBF, 79 Map Pickup LED: 51G-n/50G-n - Self Reset Other protection functions may overlap with these functions during testing, it may be useful to disable some functions to avoid ambiguity.

  • Page 30: Directional Polarity

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.7.1 Directional Polarity See section Directional Earth Fault Polarity Check above for testing details. Forward Reverse Lag (point C) Lead (point A) Lead(point B) Lag (point D) Pick-up Drop-off Pick-up Drop-off Pick-up Drop-off...
  • Page 31 7SR21 & 7SR22 Argus Commissioning and Maintenance Calculated Timing values in seconds for TM =1.0 Curve 2 xIs 5 xIs 10.03 4.28 IEC-NI 13.50 3.38 IEC-VI 26.67 3.33 IEC-EI 120.00 30.00 IEC-LTI 3.80 1.69 ANSI-MI 7.03 1.31 ANSI-VI 9.52 1.30...
  • Page 32 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.7.3.2 ANSI Reset If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected for an IEC characteristic element, the reset will be instantaneous.

  • Page 33: Sensitive Earth Fault (67/50S,67/51S)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Sensitive Earth fault (67/50S,67/51S) Figure 2-9 Sensitive Earth Fault Voltage Inputs: ), V ), V ) for directional elements Current Inputs: Disable: 64H, 50CBF, 79 Map Pickup LED: 51SEF-n/50SEF-n - Self Reset Other protection functions may overlap with these functions during testing, it may be useful to disable some functions to avoid ambiguity.

  • Page 34: Directional Polarity

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.8.1 Directional Polarity See section Directional Earth Fault Polarity Check above for testing details. Forward Reverse Lag (point C) Lead (point A) Lead(point B) Lag (point D) Pick-up Drop-off Pick-up Drop-off Pick-up Drop-off...
  • Page 35 7SR21 & 7SR22 Argus Commissioning and Maintenance Calculated Timing values in seconds for TM =1.0 Curve 2 xIs 5 xIs 10.03 4.28 IEC-NI 13.50 3.38 IEC-VI 26.67 3.33 IEC-EI 120.00 30.00 IEC-LTI 3.80 1.69 ANSI-MI 7.03 1.31 ANSI-VI 9.52 1.30...
  • Page 36 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.8.3.2 ANSI Reset If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected for an IEC characteristic element, the reset will be instantaneous.

  • Page 37: Restricted Earth Fault (64H)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Restricted Earth fault (64H) Figure 2-10 Restricted Earth Fault Voltage Inputs: Current Inputs: Disable: 51SEF, 50SEF, 79 Map Pickup LED: 64H - Self Reset The setting resistance should be measured and the value compared to that specified in the settings data. Both values should be recorded.
  • Page 38 7SR21 & 7SR22 Argus Commissioning and Maintenance Apply 2x setting current if possible and record operating time P.U. Current Operate Time Phase Tolerance Tolerance (Amps) (sec) Amps 2 x Is It is also desirable to check the operating voltage achieved with the setting resistor and all parallel CTs connected but de-energised.

  • Page 39: Negative Phase Sequence Overcurrent (46Nps)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.10 Negative Phase Sequence Overcurrent (46NPS) Figure 2-11 Negative Phase Sequence Overcurrent Voltage Inputs: Current Inputs: ), I ), I Disable: 51, 51V, 51C, 37, 49, 50CBF, 60CTS, 46BC Map Pickup LED: 46IT/46DT - Self Reset Where two NPS elements are being used with different settings, it is convenient to test the elements with the highest settings first.

  • Page 40: Definite Time Nps Overcurrent (46Dt)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.10.1 Definite Time NPS Overcurrent (46DT) If DTL setting is small, gradually increase current until element operates. If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, and check operation Apply 2x setting current if possible and record operating time P.U.
  • Page 41 7SR21 & 7SR22 Argus Commissioning and Maintenance 2.10.2.1 ANSI Reset If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected for an IEC characteristic element, the reset will be instantaneous.

  • Page 42: Undercurrent (37)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.11 Undercurrent (37) Figure 2-12 Undercurrent Voltage Inputs: Current Inputs: ), I ), I Disable: 51N, 51G, 46, 60CTS, 46BC Map Pickup LED: 37-n - Self Reset If two Undercurrent 37 elements are used with different settings, it is convenient to test the element with the lowest setting first.
  • Page 43 7SR21 & 7SR22 Argus Commissioning and Maintenance P.U. Current Operate Time Phase Tolerance Tolerance (Amps) (sec) Amps 0.5 x Is 2.11.1.1 Element Blocking The Undercurrent elements can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits...

  • Page 44: Thermal Overload (49)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.12 Thermal Overload (49) Figure 2-13 Thermal Overload Voltage Inputs: Current Inputs: ), I ), I Disable: 51, 50, 37, 50CBF Map Pickup LED: 49Alarm The current can be applied from a 3P balanced supply or phase by phase from a 1P supply. Alternatively the 3 phase current inputs can be connected in series and injected simultaneously from a single 1P source.
  • Page 45 7SR21 & 7SR22 Argus Commissioning and Maintenance Time Constant (mins) Operate Time (sec) 17.3 34.5 51.8 86.3 51.8 1726 The Thermal State must be in the fully reset condition in order to measure the operate time correctly. This can be achieved by setting change in the Thermal protection settings menu or by pressing the Test/Reset button when the Thermal Meter is shown in the Instruments Mode.

  • Page 46: 2.13 Over/Under Voltage

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13 Over/Under Voltage 2.13.1 Phase Under/Over Voltage (27/59) Figure 2-14 Phase Under/Over Voltage Voltage Inputs: ), V ), V Current Inputs: n/a apply zero current to stabilize other functions Disable: 47, 59N, 60VTS...
  • Page 47 7SR21 & 7SR22 Argus Commissioning and Maintenance If the DTL is short, starting from nominal voltage, slowly decrease the applied 3P or VL1 test voltage until the Pickup LED (temporarily mapped) is lit. Record the operate voltage. The LED should light at setting Volts +/-5%.

  • Page 48: Undervoltage Guard (27/59Uvg)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13.2 Undervoltage Guard (27/59UVG) If any 27 Undervoltage element is set to be inhibited by the 27 Undervoltage Guard element, this function should be tested. Connect the test voltage inputs to suit the installation wiring diagram utilising any test socket facilities available. It may be useful to temporarily map an LED as ‘General Pickup’...

  • Page 49: Vx Under/Over Voltage (Vx 27/59)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13.3 Under/Over Voltage (Vx 27/59) 7SR22 (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) CTS- (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) NOTE: The use of some functions are mutually exclusive...
  • Page 50 7SR21 & 7SR22 Argus Commissioning and Maintenance Op. Time 27/59 D.O. P.U. 2x Vs (OV) Phase setting Hyst. Tolerence (sec) (calculated) Volts Volts 0.5x Vs (Volts) (UV) 2.13.3.1 Element Blocking The Vx Under/Over Voltage elements can be blocked by Binary Input Inhibit and VT Supervision. This functionality should be checked.

  • Page 51: Nps Overvoltage (47)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13.4 NPS Overvoltage (47) 7SR22 (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) CTS- (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) NOTE: The use of some functions are mutually exclusive...
  • Page 52 7SR21 & 7SR22 Argus Commissioning and Maintenance 27/59 D.O. P.U. Op. Time Phase setting Hyst. Tolerence (sec) (calculated) Volts Volts 2x Vs (Volts) 2.13.4.1 Element Blocking The NPS Overvoltage element can be blocked by Binary Input Inhibit. This functionality should be checked.

  • Page 53: Neutral Overvoltage (59N)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13.5 Neutral Overvoltage (59N) 7SR22 (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) CTS- (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) NOTE: The use of some functions are mutually exclusive...

  • Page 54: Inverse Time (59Nit)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Operat P.U. Current Phase e Time Tolerence (Volts) (sec) Volts 2x Vs Check correct indication, trip output, alarm contacts, waveform record. 2.13.7 Inverse Time (59NIT) It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.

  • Page 55: Under/Over Frequency (81)

    7SR21 & 7SR22 Argus Commissioning and Maintenance 2.13.8 Under/Over Frequency (81) 7SR22 (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) CTS- (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) NOTE: The use of some functions are mutually exclusive...
  • Page 56 7SR21 & 7SR22 Argus Commissioning and Maintenance The frequency should then be gradually decreased/increased until the element resets. The reset frequency can be used to check the Hysteresis setting. If the element is set as 81-n U/V Guarded, The applied voltage must be above the 81 UV Guard Setting in the U/O Frequency menu.

  • Page 57: Section 3: Supervision Functions

    7SR21 & 7SR22 Argus Commissioning and Maintenance Section 3: Supervision Functions CB Fail (50BF) 7SR22 (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) CTS- (x2) (x4) (x4) (x2) (x4) (x4) (x2) (x4) (x4) NOTE: The use of some functions are mutually exclusive...
  • Page 58 7SR21 & 7SR22 Argus Commissioning and Maintenance Apply a trip condition by injection of current to cause operation of a suitable protection element. Allow current to continue after the trip at a level of 110% of the 50BF Setting current level on any phase. Measure the time for operation of operation of 50BF-1 Delay and 50BF-2 Delay.

  • Page 59: Voltage Transformer Supervision (60Vts)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Voltage Transformer Supervision (60VTS) Figure 3-2 Voltage Transformer Supervision Voltage Inputs: ), V ), V Current Inputs: ), I ), I Disable: 27, 47, 59N Map Pickup LED: 60VTS - Self Reset ©2010 Siemens Protection Devices Limited...

  • Page 60: Or 2 Phase Vt Fail

    7SR21 & 7SR22 Argus Commissioning and Maintenance 3.2.1 1 or 2 Phase VT fail Apply 3P balanced nominal current and voltage. Reduce 1 phase voltage until VTS operates, record voltage reduction level. 60VTS V Setting Setting x 3 Measured Voltage Reduction Increase the voltage until VTS resets.

  • Page 61: Current Transformer Supervision (60Cts)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Current Transformer Supervision (60CTS) Figure 3-3 Current Transformer Supervision Voltage Inputs: ), V ), V ) for directional elements. Current Inputs: ), I ), I Disable: 51N, 46IT, 46DT, 46BC Map Pickup LED: 60CTS - Self Reset The presence of NPS current without NPS voltage is used to indicate a current transformer failure.
  • Page 62 7SR21 & 7SR22 Argus Commissioning and Maintenance Setting Measured 60CTS Delay 60CTS Inps 60CTS Vnps 3.3.1.1 Element Blocking The CT Supervision function can be blocked by Binary Input Inhibit. This functionality should be checked. Element BI Inhibits 60CTS ©2010 Siemens Protection Devices Limited...

  • Page 63: Broken Conductor (46Bc)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Broken Conductor (46BC) Figure 3-4 Broken Conductor Voltage Inputs: Current Inputs: ), I ), I Disable: 51N, 46IT, 46DT Map Pickup LED: 46BC - Self Reset Broken Conductor uses the ratio of NPS current to PPS current to detect an open circuit conductor. These quantities can be produced directly from many advanced test sets but with limited equipment the following approach can be applied.
  • Page 64 7SR21 & 7SR22 Argus Commissioning and Maintenance 1P unbalance current 46BC Setting (% of 3P current) 100% 129% 161% 200% Measured Unbalance 46BC Setting 3P balanced current (A) 1P unbalance current (A) current Apply 1A 1P unbalance current without 3P balanced current. Measure 46BC operating time.

  • Page 65: Trip Circuit Supervision (74Tcs)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Trip Circuit Supervision (74TCS) Figure 3-5 Trip Circuit Supervision Voltage Inputs: Current Inputs: Disable: Map Pickup LED: 74TCS-n - Self Reset The TCS-n Delay can be initiated by applying an inversion to the relevant status input and measured by monitoring of the alarm output.

  • Page 66: Magnetising Inrush Detector (81Hbl)

    7SR21 & 7SR22 Argus Commissioning and Maintenance Magnetising Inrush Detector (81HBL) Figure 3-6 Magnetising Inrush Detector Voltage Inputs: Current Inputs: ), I ), I Disable: Map Pickup LED: Logical operation of the harmonic blocking can be tested by current injection at 100Hz to cause operation of the blocking signals.

  • Page 67: Section 4: Control & Logic Functions

    7SR21 & 7SR22 Argus Commissioning and Maintenance Section 4: Control & Logic Functions Autoreclose (79) Autoreclose sequences can be specified differently for Phase. Earth, Externally Initiated and SEF faults. Sequences should be simulated for each applicable different fault type with the actual relay settings required for service installed in the relay.

  • Page 68: Section 5: Testing And Maintenance

    Relay failure will be indicated by the ‘Protection Healthy’ LED being off or flashing. A message may also be displayed on the LCD. In the event of failure Siemens Protection Devices Ltd. (or one of its agents) should be contacted – see defect report sheet in section 5.3.
  • Page 69 If the above checklist does not help in correcting the problem please contact the local Siemens office or contact PTD 24hr Customer Support, Tel: +49 180 524 7000, Fax: +49 180 524 2471, e-mail: support.energy@siemens.com.

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