High voltage switchgear is a circuit breaker based electrical equipment; Manufacturers according to the requirements of the electrical primary wiring diagram, the relevant high and low voltage electrical equipment (including control electrical equipment, protection electrical equipment, measuring electrical equipment) and bus, energized conductors, insulators, etc. assembled in closed or open metal cabinets, in the power system to receive and distribute electrical energy devices, the following together to understand the basic knowledge of the high voltage switchgear details!

High voltage switchgear normal operating conditions:

1. Ambient temperature: the ambient air temperature can be below 40 (upper limit), the general area is -5) the lower limit), and the cold area is -15. When the ambient temperature is too high, the conductivity of the metal decreases, the resistance increases, and the surface oxidation is intensified. On the other hand, the temperature is too high, will greatly shorten the life of the insulation material in the cabinet, reduce the insulation strength. On the contrary, if the ambient temperature is too low, the insulation material will produce internal stress, which will then lead to the destruction of the insulation material.

2. Altitude: Generally not more than 1000 meters. The insulation level of the external insulation is determined by multiplying the required insulation withstand pressure by the correction factor ka[ka=1(1.1-h10-4)] for equipment located at a height of 1000 m above sea level. Due to the thin air in the highlands, the external insulation of electrical equipment is easy to destroy, so the use of reinforced insulation type of electrical equipment, expand the insulation distance of the air, or add insulation protection measures in the switch cabinet.

3. Ambient humidity: the daily average is below 95%, and the monthly average is below 90%.

4. Seismic degree: below 8 degrees.

5. Other conditions: no fire, explosion danger, serious pollution, chemical corrosion and violent vibration.

Four electrical states of high voltage switchgear

Operation status: the circuit breaker's handcar is in the working position, connected state, the secondary power supply is connected, the control panel is connected, the energy storage indicator is yellow, the "remote/ground switching switch" is in the "distant" position, the circuit breaker's power receiving device is running, and the measuring device displays the device operating parameters.

Hot standby state (circuit breaker manual operation state, secondary power on, control panel circuit breaker indicator green light, energy storage indicator yellow light, "remote/local" switch "remote" position, comprehensive guarantee device indicates that the power supply voltage is normal, load current 0, circuit breaker at any time according to the operation needs of the device to operate

Cold standby state: the circuit breaker is manually run in the test position and off state, the secondary power is cut off, the "remote/local" switching switch is in the "0" position, the indicator light and the integrated device of the control panel are not displayed, the circuit breaker and its connected load circuit are in good condition, and the absolute value can be measured according to the relevant regulations before operation.

The check state is that the manual handle of the high voltage switch cabinet is in the test position and the circuit breaker is in the state, the secondary power supply is cut off, the "remote/field" switching switch is in the "0" position, the indicator light of the control panel and the comprehensive guarantee device are not displayed, the grounding edge of the switch panel is in the state, and the load on the circuit breaker is checked and marked. To transfer to another state; It must be confirmed that the inspection work list has been processed, the temporary safety measures have been lifted, and the operation of separating the ground edge brake is performed. When the primary loop has inspection operations, the absolute value must be measured before moving in.

The above is a detailed explanation of the basic knowledge of high voltage switchgear, if you need to know more, you can feel free to contact us!