ZW32-12FG/630A vacuum circuit breaker

1ZW32-12FG/630A vacuum circuit breakerOverview

ZW32-12F boundary (watchdog) outdoor intelligent high-voltage vacuum circuit breaker is an outdoor distribution equipment with a rated voltage of 12KV three-phase AC 50HZ. This circuit breaker is mainly used for breaking and closing load current, overload current, short circuit, quick break, grounding protection, selectable reclosing times, local remote control and remote communication in power systems. It is suitable for protection and control in substations and industrial and mining enterprise distribution systems. When there is an internal fault in the user of the T-shaped connection of the 12KV line, or when the protection action time limit is not in line with the protection of the substation outgoing switch, even if it occurs inside the user's incoming switch, it will cause the protection of the substation outgoing switch to disconnect. If the substation fails to coincide, an accident within the medium voltage user boundary will cause a power outage to the entire distribution line. This kind of common ripple accident in the power grid will cause significant losses to society. ZW32-12F boundary (watchdog) outdoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker), installed at the responsibility boundary of the overhead line, that is, the front end of the user's incoming line, will automatically cut off single-phase ground faults and phase to phase short circuit faults within the user's boundary, avoiding faults within the user's boundary from affecting the transmission line, ensuring the electrical safety of non faulty users, and improving electrical reliability.

IIZW32-12FG/630A vacuum circuit breakerEnvironmental conditions for use

Surrounding air temperature: -40 ℃~+40 ℃; Altitude: not exceeding 2000m; wind speed not exceeding 34m/s (equivalent to 700Pa on the surface of a cylinder); Pollution level: Level IV; No frequent severe vibrations, with an earthquake intensity not exceeding 8 degrees; A place without fire, explosion, or chemical corrosion.

　　Terms of Use

3.1 Normal usage conditions

a) The ambient air temperature does not exceed 40 ℃, and the average value measured within 24 hours does not exceed 35 ℃; The ambient air temperature is -25 ℃.

b) The impact of sunlight radiation up to 1000W/m2 (sunny noon) should be considered.

c) Altitude: not exceeding 2000m.

D) The surrounding air can be contaminated by dust, smoke, corrosive and/or flammable gases, vapors, or salt spray; The pollution level shall not exceed Grade III in GB/T5582.

e) The wind speed does not exceed 34m/s

f) Vibration or ground motion from switchgear and control equipment can be ignored.

g) The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6KV.

3.2 If the above normal usage conditions are exceeded, the user shall negotiate with the manufacturer. Circuit breaker arc extinguishing chamber

The arc extinguishing chamber is the main component of a circuit breaker, as shown in Figure 1.

The vacuum arc extinguishing chamber equipped with the circuit breaker has a vacuum degree of *. Due to the CuCr50 material used as the contact of the arc extinguishing chamber and the cup-shaped longitudinal magnetic field structure, it has the characteristics of large breaking capacity, insulation water, strong arc extinguishing ability, long service life, small volume, simple maintenance, no explosion hazard, no pollution, and low noise. The vacuum arc extinguishing chamber is installed inside the upper porcelain bottle, which not only avoids many drawbacks caused by oil flushing and SF6 gas filling, but also makes maintenance and repair more convenient. The insulation material silicone ester is filled between the arc extinguishing chamber and the porcelain bottle to solve the problem of anti condensation. This insulation material has good insulation performance, aging resistance, outdoor resistance, and high temperature resistance.

10KV vacuum circuit breaker with remote control operation details introduction

　　Maintenance and repair

7.1 Product maintenance methods and precautions

7.1.1 Circuit breakers that operate normally should be regularly maintained, and the surface dust of each insulation component should be cleaned. All friction parts should be regularly lubricated with lubricating oil;

7.1.2 Every 2000 operations, check whether the screws in each part are loose. If they are found to be loose, they should be tightened in a timely manner;

7.1.3 During and after installation, the vacuum arc extinguishing chamber casing should not be subjected to a longitudinal pressure of 1000N, nor should it be subjected to significant tensile or transverse stress;

7.1.4 During installation and use, it is strictly prohibited to hit the shell of the vacuum arc extinguishing chamber with hard objects (such as tools).

7.2 Fault Handling

7.2.1 When the operating mechanism cannot reliably open and close the circuit breaker, it shall be debugged according to the requirements of the operating mechanism debugging to achieve reliable opening and closing;

7.2.2 Regularly use the power frequency withstand voltage method to check the vacuum degree of the vacuum extinguishing chamber during use. The method is to adjust the contact stroke to 11 ± 1mm and apply a 42kV power frequency voltage to the extinguishing chamber for 1 minute. There should be no continuous discharge inside the extinguishing chamber. If continuous discharge is found inside the extinguishing chamber, it cannot be used.

7.2.3 The thickness of contact burnout should be checked regularly. The specific method is to check the change in the extension length of the vacuum circuit breaker guide rod. If the total change exceeds 3mm, the vacuum arc should be extinguished when measuring

The electrical lifespan of the chamber has come to an end, and the vacuum arc extinguishing chamber must be replaced.

8. Usage and Operation

8.1 Preparation before use

Before use, the following preparations should be made:

a) Check the circuit breaker for damage or any other hazardous environmental impact. If this phenomenon occurs, it should be eliminated in advance to restore the normal working conditions of the circuit breaker.

b) Clean the insulation surface of the circuit breaker with a clean silk cloth and anhydrous ethanol. These dirt and stains have a significant impact on the insulation performance of the product.

8.2 On site testing

a) Power frequency withstand voltage test: pole to pole, ground to ground, and fracture test voltage of 95kV, test time of 1 minute; During the period, there was no breakdown or flashover phenomenon;

b) Insulation test of auxiliary circuit: test voltage to ground: 2000V1min; During this period, there was no breakdown or flashover phenomenon. The electronic components in the auxiliary circuit are not subjected to voltage withstand tests, and are subjected to voltage withstand tests

Remove or take isolation measures during the experiment;

c) The insulation test of the energy storage motor adopts a voltage of 1600V 1min for the withstand voltage test;

d) Main circuit resistance measurement: measured with a circuit resistance tester, in accordance with the provisions of Table 2;

e) Mechanical stroke characteristic test: Operate the circuit breaker at rated operating voltage and use a mechanical characteristic tester to measure the value, which meets the requirements of Table 2.