ZW20-12 Outdoor High Voltage Vacuum Circuit Breaker

I. Overview

ZW20-12 outdoor AC high voltage demarcation vacuum circuit breaker is a user demarcation switch. It is mainly composed of three parts: ZW20-12 vacuum circuit breaker body, fault detection controller and external voltage transformer. The three are electrically connected through aviation sockets and outdoor sealed control cables, with fault detection functions, protection control functions and communication functions for reliable judgment, detection of in-bound and out-of-boundary milliamp zero sequence currents and inter-phase short-circuit fault currents, and automatic removal of single-phase The main switch of ground fault and interphase short circuit fault is vacuum arc extinguishing and adopts SF6 gas insulation. The box body refers to the gas seal of Toshiba, Japan, explosion-proof, and the insulation structure technology has excellent overall sealing performance, and the SF6 gas filled inside does not leak. Affected by the external environment, its spring operating mechanism has been miniaturized and optimized for performance. Its operational reliability is significantly improved compared to traditional domestic spring mechanisms. The contact between the shaft and the sleeve of the main circuit adopts a retractable bracelet structure. , The contact resistance of the main circuit is small, and the temperature rise is low. Reliable product performance is a true maintenance-free product.

II. Basic structure of circuit breaker

2.1 The body structure of the circuit breaker is composed of a conductive circuit, an insulation system, a seal and a shell. The conductive loop is formed by connecting the incoming and outgoing wire conductive rod, the conductive clip, the soft connection and the vacuum interrupter. This product uses SF6 gas insulation. The inlet and outlet insulation sleeves are integrally cast with epoxy resin and silicon rubber. In order to reduce the volume of the switch, the corner sleeves are used for the A and C phases to ensure good external insulation; the internal composite insulation structure is used, and the SF6 gas is not charged. , Can also reach the corresponding insulation level. This product adopts a mature sealing structure. The mechanism cover and the upper cover of the shell are sealed by stamping and forming grooves, the output pointer shaft is sealed by double-layer "O" ring, and the inlet and outlet sleeves are integrally cast to ensure good air tightness.

2.2 Operating mechanism The operating mechanism of this product is electric energy storage, electric opening and closing, and also has manual energy storage, manual opening and closing, the whole structure closing spring, energy storage system, opening and closing coil, manual opening and closing system, auxiliary Components such as switches and energy storage indicators.

III. Use environment

1. Ambient air temperature: -40℃~+40℃; daily temperature difference: daily temperature change is not more than 25℃; According to the material properties of SF6 gas, when the ambient temperature is -40℃, if the air pressure inside the cabinet is 0.05Mpa, this When the SF6 is still in gaseous state, to ensure the normal operation of the product. (When the ambient temperature is -40°C and the gauge pressure is 0.05Mpa, the SF6 liquefaction point is -55°C; at zero gauge pressure, the SF6 liquefaction point will not exceed -60°C).

2. The wind speed is not more than 35m/s;

3. There is no place where there is flammability, explosion hazard, strong chemical corrosives (such as various acids, alkalis or dense smoke, etc.) and severe vibration.

4. Altitude: ≤1000m;

5. Covering thickness: 10mm;

6. Air pollution degree: Level IV;

7. Seismic intensity: ≤7 degrees;

8. The neutral point grounding method of the power grid: the neutral point is not grounded, the neutral point is grounded through the arc suppression coil, and the neutral point is grounded through low resistance.

IV. The main parameters

4.1 The rated parameters of the circuit breaker are shown in Table 1

Note: When the altitude of the product use site exceeds 1000m, the insulation withstand voltage should be corrected according to GB/T11022-1999.

4.2 The circuit breaker assembly adjustment parameters are shown in Table 2

4.3 Main technical parameters of operating mechanism

4.4.1. Energy storage motor: DC series motor is used. Its technical data is shown in Table 3. Model YJ220-5301BS Rated voltage (DC 220V) Normal operating range (85%~120% of rated operating voltage) Rated power (20W) Rated voltage Lower energy storage time (≤5s)

4.4.2. Manual energy storage operating force: The maximum operating force is less than 25 kg when the energy storage handle equipped with the mechanism is used.

4.4.3. Closing electromagnet: a solenoid type electromagnet is used. The technical data of the coil is shown in Table 4. Rated voltage (DC 220V) Rated current (3.9A) Rated power (860W) Coil resistance at 20°C (56Ω) Normal operating voltage range (65%~110% of rated operating voltage)

4.4.4 The technical parameters of the opening solenoid coil are the same as the closing coil.

4.4 Current transformer In the circuit breaker body, phase A and phase C are each equipped with a current transformer with a transformation ratio of 400/5 for phase-to-phase protection.

4.5 Zero sequence current transformer

One zero-sequence current transformer is installed in the circuit breaker body, with a transformation ratio of 20/1. In the zone of zero-sequence current 0.1~5A, there is a good linear relationship, and the transformation ratio error under rated load (0.1VA) is less than 3% , When the zero sequence current is 400A, the secondary output current is not less than 5A.

4.6 Operation power supply

4.6.1 The circuit breaker needs to operate the power supply when it is working. The operating current can be externally drawn AC or DC 220V power supply, but generally an external operating power transformer or voltage transformer is installed on the 10KV line to obtain AC 220V operating power supply, with a capacity of 1kva and a weight of 45kg.

4.7 The technical parameters of the controller are shown in Table 5

V. Ordering Instruction

5.1 If you have any special requirements, please contact us, our company will try our best to meet user requirements.