High voltage circuit breaker test selection scheme

1) 1 to 3 years

2) After overhaul

1) The overall insulation resistance is self-regulated

2) The insulation resistance of the lifting rod made of fracture and organic matter should not be lower than the following table: MΩ

Use 2500V megohmmeter

Test category

Rated voltage kV

<24

24~40.5

72.5~252

363

1000

2500

5000

10000

1000

2500

5000

10000

1) 1 to 3 years

2) After overhaul

1) Non-pure porcelain casing tgδ (%) value inspection casing section of multi-oil circuit breaker at 20 °C;

2) The tgδ(%) value of the impure porcelain casing circuit breaker at 20 °C can be increased by the following values ​​compared to the corresponding tgδ(%) value in the casing section:

1) Measure each bushing in the open state. When the measured tgδ exceeds the specified value or there is a significant increase, the tank must be dropped for the decomposition test. For circuit breakers that cannot drop the fuel tank, the oil should be released from the rent, so that the lower part of the casing and the arc extinguishing chamber are exposed to the oil surface, and then the partial pressure test is carried out.

2) When the circuit breaker is overhauled and the casing is not overhauled, it should be increased according to the corresponding value specified in the casing operation.

3) The overall tgδ(%) with shunt resistor breaker can be increased accordingly

Rated voltage
(kV)

≥126

<126

40.5 (DW1-35DW1-35D)

The increase in the value of tgδ(%)

1

2

3

1) After overhaul

2) When necessary

Test voltage is 80% of the value specified in DL/T593

1) Pressure-resistant equipment can not meet the requirements of time segmentation
In progress, the number of segments should not exceed 6 segments (252kV).
Or three segments (126kV), pressurization time is 5min

2) Each test voltage can take the entire test voltage value
Divided by 1.2 times the value obtained by the number of segments or self-regulated

1) 1 to 3 years (12kV and below)

2) After overhaul

3) When necessary (72.5kV and above)

The circuit breakers are separately operated in the divided and closed states. The test transformer values ​​are as follows:

The 12~40.5kV circuit breaker is grounded and phased according to the specified value of DL/T593;

80% of the value specified in DL/T593 for 72.5kV and above

For the three-phase common-box type oil circuit breaker, the phase-to-phase withstand voltage should be used, and the test voltage value is the same as the ground pressure resistance value.

1) 1 to 3 years

2) After overhaul

1) After the overhaul, it should meet the manufacturer's regulations.

2) Self-regulation during operation

Measured by DC voltage drop method, current is not less than 100A

1) After overhaul

2) After the institution is overhauled

Unless otherwise specified by the manufacturer, the circuit breaker's division and closing synchronicity shall meet the following requirements:

The phase closure is not more than 5ms in different periods;

The phase between the phases is not more than 3ms;

Closing between the same phase breaks is not more than 3ms;

The different periods between the fractures of the same phase are not more than 2ms;

After overhaul

Should comply with manufacturer regulations

Under rated operating voltage (air pressure, hydraulic pressure)

After overhaul

DC resistance should comply with manufacturer's regulations

1) 1 to 3 years

2) After overhaul

1) The test voltage of each component is as follows:

252kV and above oil-less circuit breaker lifting rods (including
When the leakage current of the supporting porcelain sleeve is greater than 5μA,
Attention

Rated voltage kV

40.5

72.5~252

≥363

DC test voltage kV

20

40

60

Big and small repair time

Self-regulation

When conditions permit