Toshiba HV6CS-MLD, H6A-HLS operation manual Test Procedure

Page 34

TEST PROCEDURE:

1. The circuit breaker should be disconnected from the main circuit and be in the OFF position.

2. Connect all the line side primary terminals together and to the output of the vacuum checker or AC hi-pot machine. Connect all the load side primary terminals together and to the ground terminal of the vacuum checker or AC hi-pot machine.

3. Increase the voltage from zero to 22kV AC at a rate of approximately 2kV per second. Hold the voltage at this value for 1 minute and observe the current drawn by the interrupter.

Note: If the ammeter fluctuates violently as the voltage increases to AC22 kV, repeat the voltage increase procedure two or three times. If the current still rises when the voltage is increased, the vacuum level may be insufficient;

replace the vacuum interrupter.

1 minute

4. Decrease the voltage back to zero.

22kV AC

 

(31kV DC)

 

 

 

CRITERIA:

 

 

1. If a current flow above 5 milliamperes is observed or

Voltage

 

if breakdown occurs, one or more of the interrupters

 

 

 

has insufficient vacuum and must be replaced.

 

 

Exception: If the current exceeds 5 milliamperes the

Zero

 

first time the voltage is brought up, reduce the

 

 

 

voltage to zero and increase it again. It may be

15 sec

15 sec

necessary to repeat this procedure a few times.

 

Time

 

 

2. If the breaker fails to meet criteria 1, then repeat the

Figure 24 Application of Test

Voltage for Vacuum Check

test on each pole separately to identify the damaged

 

 

interrupter or interrupters.

 

 

3.If the voltage can be held for 1 minute and the current flow does not exceed 5 milliamperes, the interrupter has a sufficient vacuum level.

After the test is complete, discharge any residual static charge from the primary terminals of the circuit breaker.

If a vacuum checker or AC hi-pot tester is not available, a DC hi potential test may be conducted. If a DC test is conducted, the test voltage must be increased to 31kV DC. The test duration for DC tests and the criteria for acceptance remain the same as for AC tests.

WARNING

Do not use DC hi-pot testers which employ unfiltered half-wave rectifiers. The peak voltages produced by these testers may exceed the recommended value of 31kV. This can result in the production of harmful X-rays

and may invalidate the test results.

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Contents HV6CS-MLD Page Important Notice About This Manual Contacting TIC’s Customer Support Center Table of Contents General Safety Information Safety Alert SymbolEquipment Warning Labels Equipment Inspection Connecting and disconnecting the main circuit Operating the VCBInstallation location During UseSpecial environmental conditions Applicable standards pertaining to switching surges Part Names Drawout Type Circuit BreakerFrom Receipt to Storage Receipt and UnpackingTransport Hoisting the Circuit BreakerDrawout Cell Lifting the Drawout CellStorage Mounting the Drawout Cell InstallationMounting in the panel Place the VCB on the lifter Location of VCB holding pin with chain Closing the Circuit OperationManual Operation For Motorized Spring-operated VCBsWhen the spring is taut Perform the step shown in Figure Opening the Circuit Electrical Operation Control Circuit Motorized OperationPlug Installed in UV Trip Device Undervoltage TripPage Maintenance/Inspections Maintenance RecordTypes of Maintenance and Inspection Work During Maintenance/InspectionsInspection Frequency Periodic Inspection Checkpoints Vacuum Check Location Inspection Criteria Disposition Remarks MethodPrecautions Test Procedure Dielectric Breakdown Characteristics Page Page Toshiba

H6A-HLS, HV6CS-MLD specifications

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