PRE COMMISSIONING TEST PROCEDURE FOR BUS BAR

PRE-COMMISSIONING TEST PROCEDURE FOR BUS BAR

This busbar test is prepared to carry out various pre-commissioning tests to be conducted in a systematic manner for Panel Bus bar to ensure the healthiness and performance of the Bus Bar

Scope

This procedure covers the Pre commissioning test for Bus Bar as for the following

CRM Test
Insulation Resistance Test
High Voltage (Hi-Pot)AC Test

Pre-Testing Checks

Check out the working condition of ELCB(30 mA)
Check the insulation of power cable for equipment
Ensure proper earthing and rubber mats available at the work location.
Calibrated Testing equipment should be used and calibration reports available with engineers for the same
Check out the insulates hand tools available with the technician
Ensure the Healthiness of the test leads (Check for any insulation Damages)
Ensure appropriate PPE’s available at sites

Resources – Tools and Equipment Required

For CRM Test:

CRM kit
Connecting cables
Insulated Hand tools

For Insulation Resistance measurement Test (IR Test):

Test Leads
500 V, 5000 V Insulation Tester
Insulated Hand Tools

For High voltage Test (Hi-pot test):

High Voltage Test Kit
Test Leads
500 V, 5000 V Insulation Tester
Clamp meter
Insulated Hand Tools

Operational Sequence of work(Test Procedure)

Contact Resistance Measurement (CRM) Test – Bus Bar

Take the work permit from the client
Ensure zero energy in the Bus Bar
Disconnect Bus bar from the transformer
Connect the earth from CRM kit to earth plate or earth pit
Connect the CRM kit voltage leads to across the(R-Phase) Bus Bar joint
Connect the CRM kit current leads to across the(R-Phase) Bus Bar Joint, at the same time Voltage leads should be connected inside the current leads
Ensure that all the connections are connected properly
Connect the CRM kit in A.C supply extension board with ELCB rated with 30 mA
Apply the rated current to the Bus bar
Note down the resistance value from the CRM kit
Repeat the above procedures for remaining (YØ & BØ)Phases for CRM Test
Switch off the supply to the CRM Kit and disconnect the connections

DO’s

DON’TS

Busbar should be in zero energy condition.

Voltage leads should be connected inside the Current leads.

While doing this test, no external cables should be connected.

Proper grounding should be done for the kit.

Don’t change the connection sequence (i.e., V+, C+ should be connected to R or Y or B & V-, C- should be connected to R’ or Y’ or B’ ).

Don’t change the supply configuration (i.e., voltage should be applied outside the current leads).

Contacts should not have any dust during this test.

IR TEST BETWEEN PHASE TO EARTH(BUS BAR):

Check the Bus Bar tightness and panel earthing
Connect the IR kit Positive lead with RØ Bus Bar
Then connect the IR kit Negative lead with earth
Select the required voltage range in IR kit
Switch “ON” the IR kit and press the test button take down the reading
Switch “OFF” the IR kit
Discharge the potential from the bus bar with respect to earth
Repeat the above steps for the other Bus bar phases (YØ & BØ)

IR TEST BETWEEN PHASE TO PHASE (BUS BAR):

Connect the IR kitacross the RØ-YØ Bus Bar
Select the required voltage range in IR kit
Switch “ON” the IR kit and press the test button take down the reading
Switch “OFF” the IR kit
Discharge the potential from the Bus bar with respect to earth
Repeat the above steps for the other Bus bar phases (YØ-BØ) &( BØ-RØ)

Do’s

Don’ts

Personal Protective equipment (PPE) should be used while testing
All the testing equipment must be connected to the proper earth line
Ensure all the connections are in tight after testing
Ensure the external wires are removed from isolator
Before doing testing, discharge the Isolator terminals.
Test equipment’s to ensure zero energy state before beginning the work
Discharge the Busbar after each test

Unauthorized persons should not enter the testing premises.
Avoid contact with energized electrical circuits
Do not use the twisted testing cables
Never bypass fuses and circuit breakers.
Don’t use the joint cables while testing.
Avoid testing during rainy season.
Do not make connection changes while testing

3 High Voltage(Hi-Pot ) AC Test – 11kv Bus Bar:

Take the work permit from the client
Check the bus bar terminal should be no voltage and earthing
Ensure the during the High voltage test all other equipment’s related to the Bus bar installation such as switches, instrument transformers, Cable etc., must be earthed and clearance should be maintained from the other equipment and frame work to prevent flashover.
Connect the controller kit and Transformer
Connect the Hi-Pot kit with ELCB 30mA
Connect the test (Transformer kit)HV lead to the RØ Bus bar conductor
Looped (Shorted) the other conductors (BØ & YØ) and connect it to the earth
Switch “ON” the test kit and apply voltage to the Bus bar and after taking the reading
Switch “OFF” the test kit
Use discharge rod to discharge the potential from the Bus bar
Repeat the above steps for measuring the other phases (YØ & BØ)

Do’s	Don’ts
Personal Protective equipment (PPE) should be used while testing All the testing equipment must be connected to the proper earth line Ensure the all connections are in tight after testing Ensure all the supply is dead After testing, discharge the busbar terminals. Test equipment’s to ensure zero energy state before beginning the work Trip test should be done before the Hi pot test	Unauthorized persons should not enter the testing premises. Avoid contact with energized electrical circuits Do not use the twisted testing cables Never bypass fuses and circuit breakers. Don’t use the joint cables while testing. Avoid testing during rainy season. Do not make connection changes while testing