Transformer introduction

Update date:2018-05-09 Source:MAXGE

Transformer introduction

Vacuum circuit breaker technical parameters and performance requirements

First, circuit breaker technical parameters

The technical parameters of demarcation breakers are shown in the technical parameter characteristics table of the dedicated part of this section.

Second, universal

1. Vacuum circuit breaker requirements

1 The arc extinguishing chamber used with the same type of vacuum circuit breaker should be uniform in its installation method, end connection method and connection size.

2 The external insulation of the arc extinguishing chamber of the vacuum circuit breaker can use SF6 gas, dry air or composite insulation material.

3 Vacuum circuit breakers should be equipped with counters that record the number of operations.

4 The vacuum circuit breaker shall adopt the structure where the operating mechanism and the body are integrated.

5 The vacuum interrupter should be consistent with that used in the type test.

6 The vacuum interrupter allows the storage period to be not less than 20 years. The extinguishing chamber vacuum at the factory shall not be less than 1.33×10-3Pa. In the allowable storage period, the degree of vacuum should meet the operating requirements.


7 The vacuum interrupter should be tested at the factory with the "old" test and attached with a report.

8 Insulating bushings of circuit breakers should be made of composite insulating material with strong anti-ultraviolet resistance and hydrophobic properties. The sheds should adopt alternating structures of large and small sheds, with a section of not less than 300 mm2.

9 circuit breakers should have over-current, quick-break and closing surge protection.

10 Circuit Breaker Rated Operating Sequence: Satisfy the requirements of "sub-0.3s-combination-180s-combination".

The composition of the vacuum circuit breaker

The main structure of the vacuum circuit breaker consists of a vacuum interrupter, an operating mechanism, and an insulating support base frame.

1. Vacuum interrupter

According to the different types of switch, there are an outer shield ceramic vacuum interrupter, an intermediate sealed cup-shaped vertical magnetic field miniaturized vacuum interrupter, and an inner sealed glass bubble arc extinguishing chamber. The basic structure is as follows:

1 airtight insulation system (housing)

The air-tight insulation system consisting of a hermetic insulation cylinder made of ceramic, glass or glass-ceramic, a moving end cover, a fixed end cover, and a stainless steel bellows is a vacuum-tight container. In order to ensure the airtightness, in addition to the stringent operating process in the sealing type, the permeability of the material itself and the amount of internal bleeding are also required.

2 conductive system

It consists of a fixed conducting rod, a fixed running arc, a fixed contact, a moving contact, a moving running arc, and a movable conductive rod. There are roughly three types of contact structures: cylindrical contact, transverse magnetic contact with spiral groove running, longitudinal magnetic contact. Axial magnetic field technology is currently used. This arc extinguishing chamber has a strong and stable arc breaking capacity.


3 shielding system

The shield is an indispensable element in the vacuum interrupter, and there are a plurality of main shields surrounding the contacts, a bellows shield, and a shield for voltage equalization. The role of the main shield is to: a. prevent the arc product from splashing on the inner wall of the insulating shell during the arcing process, thereby reducing the insulation strength of the shell. b Improve the uniformity of the electric field distribution inside the arc chamber, which helps to reduce the local field strength and promote the miniaturization of the vacuum interrupter. c Condensates the arc product and absorbs some of the arc energy, contributing to the restoration of the strength of the medium behind the arc.

2, operating mechanism

According to the circuit breaker type, different operating mechanisms are used. Commonly used operating mechanisms include a spring operating mechanism, a CD10 electromagnetic operating mechanism, a CD17 electromagnetic operating mechanism, a CT19 spring energy storage operating mechanism, and a CT8 spring energy storage operating mechanism.

3, other components

Bases, insulation supports, insulators, etc.

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