Siemens 7SG14 Duobias-M-200 Technical Manual Download | Manualshive

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7SG14 Duobias-M-200 Commissioning

Next unbalance the differential protection by 180

°

reversing a vector group compensation setting. e.g.

Yd1 would become yD7

Yy0 would become Yy6

Repeat the tests and record the currents inTable 15.

The operate currents "OPERATE A, B, C" should now be comparatively large.

Reset the vector group compensation setting back to the correct setting, re-check that the "OPERATE A, B, C"
currents are negligible.

12 Putting into service

Ensure that: The trip supply is connected.

Press the CANCEL button several times on the front of the relay to move back to the top of the menu structure

Press the TEST/RESET pushbutton

None of the RED LEDs should be illuminated.

Check the Protection Healthy GREEN LED has continuous illumination.

Ensure that all earth links, trip links and inter-trip links are in their normal operational positions.

Operate the Cancel PUSH BUTTON

Replace the cover.

13 Site test sheet

See following pages

.

©2010 Siemens Protection Devices Limited

Chapter 7 Page 13 of 20

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Summary of Contents for 7SG14 Duobias-M-200

Page 1: ...cument 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 7SG14 Duobias ...

Page 2: ...Earth Fault 51 51N 50 50N 50G 51G 11 9 10 Negative Phase Sequence Over Current 46DTL 46ITL 11 10 PRIMARY INJECTION TESTS 11 10 1 Biased Differential Protection 12 10 2 Restricted Earth Fault 12 11 TESTS USING LOAD CURRENTS 12 12 PUTTING INTO SERVICE 13 13 SITE TEST SHEET 13 1 SITE TESTS 15 1 1 Insulation Resistance 15 1 2 Hardware Tests 15 1 2 1 Status Inputs 15 1 2 2 Output Relays 16 1 3 Secondar...

Page 3: ...ntial Characteristics 17 Table 6 Inrush Inhibit 17 Table 7 Highset Differential Pickup 17 Table 8 Restricted Earth Fault 17 Table 9 Over Fluxing Inverse Curve 24IT 18 Table 10 Over Fluxing Dual Definite Time 24DT 18 Table 11 Thermal Overload 18 Table 12 Backup Overcurrent and Earth Fault 18 Table 13 Negative Phase Sequence Over current 18 Table 14 Primary Inject Magnitude Check 19 Table 15 Operate...

Page 4: ...are in good condition It is recommended that all power supplies to test equipment be connected via a Residual Current Device RCD which should be located as close to the supply source as possible The choice of test instrument and test leads must be appropriate to the application Fused instrument leads should be used when measurements of power sources are involved since the selection of an inappropr...

Page 5: ... therefore the relay itself does not requires a pressure test The external wiring must still be tested for any insulation breaks Before commencing a visual inspection of the wiring take the following precautions Isolate the auxiliary supplies Remove the trip and inter trip links Check that the relay wiring is complete and that all terminal connections are tight and remove the earth links before co...

Page 6: ...a 25pin RS232C type communications port on the front of the fascia This should be connected to a laptop using a 25 to 9 pin RS232 cable Alternatively a USB connection to the laptop may be used but this may require some Reydisp Configuration changes Reydisp Evolution should be installed on the laptop and this should run on any MS Windows operating system To use the relay communications port the Com...

Page 7: ... set to use is an Omicron Type CMC256 or CMC156 plus CMA156 Automatic test software can be provided to allow input of settings and automatic testing and reporting The Omicron set should be connected in accordance with the manufacturer s instructions The following settings must be selected on relay to avoid any confusion during testing The initial and bias slopes settings should be set to the chose...

Page 8: ...rrents Inject nominal current into W1 Red and W2 Red Phase current inputs If the test set has the facilities it can also be done three phase While testing the bias slope select the Instrument display W1 Relay Currents x IN 0 00 0 00 0 00 The Differential Operate and Restrain Current Meters should also be checked Repeat the tests with increasing bias currents up to 2 5 times the relay rating Record...

Page 9: ...Test sets such a Omicron 256 6 use a ratio injection to test the relay inhibit the Duobias M does not work like this as its setting is a percentage of the operate current 2ND HARMONIC CURRENT INTO W2 REQUIRED TO BLOCK 87BD FOR NOMINAL FUNDAMENTAL CURRENT INJECTION OF W1 INPUTS SETTING AT RECOMMENDED TEST POINT IN TERMS OF 2ND OPERATE INRUSH SETTING FRACTION OF IOP 50 Hz Relay x In 60 Hz Relay x In...

Page 10: ...personnel can come into contact with secondary wiring during this test Tests are carried out with the current transformers connected in idle shunt to the REF parallel leg Apply voltage across the REF parallel leg input via the test block or lead and connect an a c voltmeter to verify the voltage applied Slowly increase the applied voltage and note the voltage required for the REF protection to ope...

Page 11: ...ent is derived from the residual sum of the three phase current inputs The 50N 51N elements are measured directly from the single Aux I P input NOTE All 51 elements have a minimum pickup of 1 05 xIs all 50 elements have a minimum pickup of 1 00 xIs 9 10 Negative Phase Sequence Over Current 46DTL 46ITL The negative sequence current is measured from the phase inputs Pure negative phase sequence curr...

Page 12: ... a definite result to be established Place a temporary short across the setting resistor to allow the secondary current to be measured Insert the test block with necessary shorts across from CT to relay side Inject primary current sufficient to allow measurement Measure and record the REF spill current displayed by the appropriate relay Instrument This spill current should be very small e g a few ...

Page 13: ...B C currents are negligible 12 Putting into service Ensure that The trip supply is connected Press the CANCEL button several times on the front of the relay to move back to the top of the menu structure Press the TEST RESET pushbutton None of the RED LEDs should be illuminated Check the Protection Healthy GREEN LED has continuous illumination Ensure that all earth links trip links and inter trip l...

Page 14: ...NS CONTRACT NUMBER ______________________________ SITE CIRCUIT REF ______________________________ RELAY SERIAL NUMBER ______________________________ RELAY MODEL DUOBIAS M 2______ RELAY ARTICLE NUMBER ______________________________ Signatures and Date Test Engineer Customers Representative 2010 Siemens Protection Devices Limited Chapter 7 Page 14 of 20 ...

Page 15: ...llz z z OK Status 2 PSU 25 27 OK Status 3 PSU 26 28 OK Status 4 I O 1 1 3 OK Status 5 I O 1 5 7 OK Status 6 I O 1 9 11 OK Status 7 I O 1 13 15 OK Status 8 I O 1 17 21 OK Status 9 I O 1 19 21 OK Status 10 I O 1 23 27 OK Status 11 I O 1 25 27 OK Status 12 I O 2 1 3 OK Status 13 I O 2 5 7 OK Status 14 I O 2 9 11 OK Status 15 I O 2 13 15 OK Status 16 I O 2 17 21 OK Status 17 I O 2 19 21 OK Status 18 I...

Page 16: ...elay 19 I O 2 N O 20 22 OK Relay 20 I O 2 N O 24 28 OK Relay 21 I O 2 N O 26 28 OK Relay 22 I O 3 N O 2 4 OK Relay 23 I O 3 N O 6 8 OK Relay 24 I O 3 N O 10 12 OK Relay 25 I O 3 N O 14 16 OK Relay 26 I O 3 N O 18 22 OK Relay 27 I O 3 N O 20 22 OK Relay 28 I O 3 N O 24 28 OK Relay 29 I O 2 N O 26 28 OK Table 3 Output Relay Contacts 1 3 Secondary Injection 1 3 1 Accuracy of Measurement TEST AVAILABL...

Page 17: ...se B Pickup Phase C Pickup Table 5 Biased Differential Characteristics 1 3 3 Inrush Inhibit Pickup 87 INRUSH SETTING XID ACTUAL BLOCKING LEVEL XID Table 6 Inrush Inhibit The tolerance for the Inrush Setting is 10 of setting 1 3 4 Differential Highset Pickup PHASE SETTING XIN A PHASE PICKUP B PHASE PICKUP C PHASE PICKUP Table 7 Highset Differential Pickup 1 3 5 Restricted Earth Fault TEST FITTED VA...

Page 18: ...ERATE TIME SECONDS Table 11 Thermal Overload 1 3 8 Backup Over current and Earth Fault CALCULATED OPERATE TIME S AT MULTIPLE OF PU ELEMENT ANSI NO E G 51N PICKUP SETTING ACTUAL PICKUP s x PU ACTUAL OPERATE TIME DELAY S RESET TIME APPLIED RESET TIME RECORDED Table 12 Backup Overcurrent and Earth Fault 1 3 9 Negative Phase Sequence Over current CALCULATED OPERATE TIME S AT MULTIPLE OF PU ELEMENT ANS...

Page 19: ...cks PHASE DIFFERENCE OF WINDING ICT CURRENTS ANTI PHASE CHECK A Phase OK B Phase OK C Phase OK Table 16 Primary Injection Phase Difference Check The Winding W1 W2 etc ICT Currents for each phase should be in anti phase For a two winding transformer the W1 ICT A phase current should be in anti phase 180 degrees apart with the W2 ICT A phase current All phases should be checked to ensure wiring erro...

Page 20: ...icate for the operation of each device OK Protection Healthy Alarm Local and Remote indication and alarm confirmed OK Table 18 Trip Alarm and Indication Test 1 6 Communication TEST ACTION RESULT Local Relay Port Download Settings Confirmed OK Saved Settings File Record the name of the As Installed Settings File s and storage location Remote Relay Access if used Relay Access Confirmed OK Relay Pass...

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