Document Number: ECP 11-0514 Version: 2.0 Date: 23/05/2016 THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE ENGINEERING COMMISSIONING PROCEDURE ECP 11-0514 ACB COMMISSIONING PROCEDURE Network(s): EPN, LPN, SPN Summary: This document details the testing and commissioning procedures for air circuit- breakers and the associated reverse power relay where applicable. Author: Stephen Tucker Date: 23/05/2016 Approved By: Paul Williams Approved Date: 07/06/2016 This document forms part of the Company’s Integrated Business System and its requi rements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue. Circulation UK Power Networks External All UK Power Networks G81 Website Asset Management Contractors Capital Programme ICPs/IDNOs Connections Meter Operators HSS&TT Network Operations UK Power Networks Services Other
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ECP 11-0514 ACB Commissioning Procedure · PDF fileTrip Unit Family Micrologic Micrologic Micrologic Micrologic Micrologic Micrologic Trip Unit Type 5.0 5.0A 5.0A 5.0A 5.0A 5.0A Breaker
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Document Number: ECP 11-0514
Version: 2.0
Date: 23/05/2016
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ENGINEERING COMMISSIONING PROCEDURE
ECP 11-0514
ACB COMMISSIONING PROCEDURE
Network(s): EPN, LPN, SPN
Summary: This document details the testing and commissioning procedures for air circuit-breakers and the associated reverse power relay where applicable.
Author: Stephen Tucker Date: 23/05/2016
Approved By: Paul Williams Approved Date: 07/06/2016
This document forms part of the Company’s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue.
1.1 This document details the testing and commissioning procedures for air circuit-breakers (ACB), and the associated reverse power relay (RPR) where applicable, that shall be satisfied before the ACB can be accepted as fit for service and energisation.
1.2 This procedure shall be carried out by the Commissioning Engineer or his appointed representative, who shall be an Authorised Person having appropriate training and/or experience.
1.3 This procedure shall be carried out in accordance with the requirements of the Distribution Safety Rules.
1.4 This procedure shall be carried out having regard to the requirements and recommendations of the manufacturer. If conflict exists between the requirements of the manufacturer and those of UK Power Networks the matter shall be referred to Asset Management (or your UK Power Networks nominated contact).
1.5 This procedure assumes:
The ACB is disconnected from the HV and LV networks.
The ACB is disconnected from the RTU (if fitted).
1.6 The results of all observations, tests, adjustments and all relevant remarks shall be recorded on the appropriate test form.
1.7 Where possible testing shall be carried without disconnecting or disturbing any wiring.
2 Scope
2.1 This procedure applies to all LV ACBs with overload and reverse power relay protection as detailed below:
Schneider Electric Masterpact NS1250, NT16H2, NW16H1 and NW20H1.
2.2 The associated test forms, which should be read in conjunction with this procedure, include specific schematic diagrams, connections and trip levels for the ACBs listed above.
2.3 This procedure is intended for use by UK Power Networks field staff, contractors and external connection providers.
6.1 Record the substation name, substation number, ACB model type, ACB serial number, Micrologic model type, protection settings and RPR details on the test form.
6.2 Carry out a visual inspection of the ACB as detailed below. If possible the Commissioning Engineer shall rectify any non-conformances. However, all equipment defects shall be referred to Asset Management.
Check that the ACB is undamaged, correctly mounted and secured.
Check the three-phase clearance at both the transformer and cable box terminals.
Check that there are no remains from the shear off bolts at the back of the ACB housing/enclosure.
Check that the earth terminal(s) of the ACB are securely connected and directly to the substation earth electrodes using the correct earthing cable(s).
Check that all external surface finishes are undamaged.
7 Protection Settings
7.1 Apply overcurrent and earth fault protection settings as required.
8 Functional Checks
8.1 Carry out the checks detailed below and record the results on the test form. In the event of non-conformance with the functional expectation the result shall be recorded on the test form and the equipment shall not be accepted into service.
8.2 Check for correct operation of the ACB is in accordance with the manufacturer's instructions.
Check the spring charging handle by pressing it downwards 7 times until a ‘clac’ sound is heard, this indicates the spring is charged/latched, the position indicator will confirm this.
Close the ACB by pressing ON button.
Open the ACB by pressing OFF button.
8.3 Carry out a functional check of motor spring charge (NW ACBs only):
Connect 240V AC supply test set to ACB.
Switch on test set and apply 240V. The spring charging motor will start to charge the ACB spring close mechanism.
Operate the ACB several times to check that the spring charge mechanism automatically recharges after every closing operation.
9.1 Carry out an ACB continuity test using a multi-meter or continuity checker as detailed below and record the results on the test form.
9.2 Close the ACB.
9.3 Prove the continuity between each phase on the back of the ACB enclosure and each phase on cable box terminal (at the bottom of the ACB enclosure).
10 High Voltage Insulation Test
10.1 Carry out insulation resistance test as detailed below and record the results on the test form.
10.2 Close the ACB. Measure the insulation resistance using a 1kV insulation resistance tester between each phase and earth with the other two phases earthed.
10.3 Open the ACB. Measure the insulation resistance using a 1kV insulation resistance tester between L1, L2, L3 on one side and earth with L1, L2, L3 on the other side all earthed.
11 Secondary Injection Tests (using Full-function Test Kit)
11.1 Carry out the secondary injection tests below using the Schneider full-function (suitcase) test kit (refer to Schneider instruction bulletin 48049-183-02 for further details) and record the results on the test form.
11.2 Close the ACB.
11.3 Assemble the test kit as follows:
Connect the test lead to test kit and to 10-pin test socket on the trip unit.
Connect the power cable to full-function test kit.
Turn on the test kit and observe the power on test.
If Spinning Schneider Electric logo resolves to the title screen, proceed with use, if it continues to spin after 10 seconds and the title screen does not appear, abort the test and return the test kit for repair.
11.5 Press Test Breaker Trip. Note: When the Test Kit Function screen appears there will be a short delay before the Test Breaker Trip option appears.
11.6 Enter the ACB parameters using the table below into the Configure Circuit Breaker Parameters screen for the ACB under test and press Next. These settings will be stored in the test set for future tests.
Note: All details must be entered before progressing.
11.7 On the Select Circuit Breaker Test screen select Automatically Test Trip Curve.
11.8 Confirm that the protection settings shown on the Configure Protection Parameters screen match those applied to the Micrologic unit and press Next.
Note: If the settings are incorrect, press the value on the screen to show the appropriate dial screen to enable the settings to be amended using the dials, e.g. the Select Ir DIAL is shown below. The Trip units with the letter ‘A, P and H’ have a communication link with the test set and will ensure the setting are correct. The units without the letter will need to be cross referenced.
11.9 On the Configure Automatic Trip Curve Test screen ensure that all four options read Enabled and press Next.
11.10 The screen will present the Automatic Trip Curve Test Alert, ensure that the ACB is closed and press Yes to start the test.
11.11 The Automatic Trip Curve Test screen displays a table with three columns: injection current, trip time and status which indicates testing progress for each protection function.
11.12 The test set will confirm ‘PASS or FAIL’ after the equipment completes its test cycle, at this stage record the test figures on the test form. On completion of each test, close the ACB before continuing to next test.
Note: The Micrologic 5 may fail the short term test if the long term test is performed first. If the short term test fails wait 15 minutes for the unit to cool down and then run the short term test again on its own.
11.13 Once testing has been completed, press Home to return to the start screen, turn-off the test kit and disconnect all cabling.
12 Trip Tests (if secondary injection is not possible)
12.1 Carry out a trip test as detailed below using the Schneider mini hand-held test kit (refer to Schneider instruction bulletin 48049-184-01 for further details) and record the results on the test form.
12.2 Carry out a overcurrent short-circuit trip test as follows:
Close the ACB.
Connect the hand-held test kit to the STR/Micrologic trip unit.
Press Short-circuit Trip button (A).
The red LED will light (non-communicating units) or flicker (communicating units) indicating short-circuit trip test is in progress.
The ACB trips.
Once the short-circuit trip test has been successfully completed, the red ground-fault trip LED should go out automatically with no error displayed.
Disconnect the hand-held test kit from the trip unit.
12.3 Carry out an earth fault trip test as follows (earth fault units only):
Close the ACB.
Reverse the polarity of the 2-pin test cable connection.
Connect the hand-held test kit to the STR/Micrologic trip unit.
Press the Ground-fault Trip button (B).
The red LED will light indicating the ground-fault trip test is in progress.
The ACB trips.
Once the ground-fault trip test has been successfully completed, the red ground-fault trip LED should go out automatically with no error displayed.
Disconnect the hand-held test kit from the trip unit.
15.1 Check for the correct operation of the remote control:
Reconnect umbilical cable to RTU (if fitted).
Simulate or carry out a remote open.
Simulate or carry out a remote close.
16 Metering Equipment (if fitted)
16.1 Commission the metering CTs in accordance with ECP 11-0516.
17 Final Checks
17.1 On completion of the commissioning tests check the following:
A neutral-earth bond is installed between transformer neutral bushing and transformer tank earth terminal where the ACB is mounted directly on the transformer. Note: This configuration cannot be used at a site with separate HV and LV earths.
All links are replaced and secure.
Spring is charged.
18 Test Equipment
18.1 Record the purpose, make, type and serial or asset number of all test equipment used during commissioning on the test form.
19 Certification
19.1 When all the tests have been satisfactorily completed, sign and date the test form. The test form should be left on-site in a plastic wallet and in a secure location.
20 Asset Data and Information
20.1 UK Power Networks
20.1.1 Send a copy of the completed test form and the asset data form to the Asset Registration Team (ART) via the appropriate mailbox below.