Combined type auxiliary switch used for circuit breaker mechanism

Abstract

The invention discloses a combined type auxiliary switch used for a circuit breaker mechanism. The combined type auxiliary switch comprises a square shaft, a front cover plate, a rear cover plate, a pull rod, a first contact box assembly and a second contact box assembly, wherein the first contact box assembly and the second contact box assembly have same outline shapes and are provided with pull rod through holes and square shaft through holes; the thickness of the first contact box assembly is greater than that of the second contact box assembly; the opening distance between movable and static contacts of the first contact box assembly is greater than the opening distance between movable and static contacts of the second contact box assembly; the first contact box assembly is used for controlling an electric circuit with great current or great inductance component; and the second contact box assembly is used for controlling a signal switching circuit. According to the combined type auxiliary switch used for the circuit breaker mechanism, the two contact box assemblies are arranged on one auxiliary switch and combines different requirements of a switching-off / on coil circuit for executing electromagnet movement, and a position and state indication signal switching circuit; and the reliability and the sensitivity of the auxiliary switch are improved and the service life is prolonged.

Description

technical field [0001] The invention relates to a switch electrical device, in particular to an auxiliary switch (also known as a universal transfer switch), in particular to a combined auxiliary switch used on a circuit breaker mechanism in high-voltage electrical equipment, and belongs to the technical field of switch electrical appliances. Background technique [0002] Auxiliary switch is a commonly used switching device in the high and low voltage circuit control system. Because it can not only control the electrical circuit with large current and large inductance component in the secondary circuit, it can also be used in switching electrical interlocks and relays. Many kinds of small current control signals are manipulated in the protection system, so the auxiliary switch is widely used in the existing high and low voltage electrical control systems. , such as the Chinese Patent Publication No. CN101106030 patent document discloses an auxiliary switch, which includes a ...

AI Technical Summary

Problems solved by technology

The former circuit has a large current and a large inductance component, requiring the auxiliary switch to have a large current breaking capacity and arc extinguishing capacity; the latter is a signal switching circuit, which controls electrical signals and controls milliampere level The small current, and the loop is almost a pure resistance loop, requires the auxiliary switch to have high sensitivity, and the contact resistance between the switch contacts should be as small as possible. However, the existing auxiliary switches all have the same structure. The contact box components are stacked together, and all the switch contacts have the same breaking capacity, and the different conditions of the two types of control circuits required by the circuit breaker mechanism are not considered separately.

Therefore, it often occurs that the breaking capacity of the auxiliary switch is insufficient, the contacts are burned, and the circuit breaker refuses to open or close, resulting in serious power failures; The vulcanization produces a high-resistance film layer, which makes the contact resistance between the contacts larger; when the signal current passes through, the resistance in the circuit is larger, so that the current between the contacts cannot be conducted, causing the circuit breaker Problems such as position signal indication errors will affect the normal operation of the circuit breaker and even cause electrical accidents

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