Jump reactance current limiter

Abstract

A jump reactance current limiter is composed of a jump reactance, a degaussing circuit and a circuit for preventing the jump reactance from vibrating, wherein the jump reactance is composed of a main loop (1), a degaussing loop (2), a fixed core (3), a movable core (6) and a spring (5) between the two cores, and the main loop is connected with the power supply circuit in series to constitute a series loop; the degaussing circuit is composed of the degaussing loop, a degaussing switch (9), a stroke switch (10) and a stroke compression bar (11); the degaussing loop is wound on a bobbin bracket (8) having the same magnetic circuit core with the main magnetic circuit, and when the degaussing circuit is switched on, the netic potentials of the two loops is equal or reverse in the phase. When no short circuit is provided between the series loops, air gaps (12) are arranged between twp cores, and the jump reactance is the micro-impedance; which is provided with a short circuit, the two coresare closed, and the jump reactance is the high impedance. The invention is used as the initiative type protection key apparatus, which is widely used in the power system and the electric apparatus ofthe high level, the middle level and the low level.

Description

technical field [0001] The present invention relates to reactance devices, in particular to a jump reactance current limiter, which is an electromagnetic combined reactance device without electrical switching, because its core device jump reactance is low reactance and overload current within the rated operating current The lower jump becomes high reactance, so it is called a jump reactance current limiter. Background technique [0002] Among the existing current limiting technology and structural technology, there are the following problems: [0003] 1. The greater the current limiting effect of fixed impedance and semiconductor components, the greater the loss ratio during normal operation; [0004] 2. When the current of the semiconductor element is limited, the waveform of the power supply is changed; [0005] 3. In the state of short-circuit in the electrical circuit, the traditional technology has a scheme of connecting the current-limiting resistor in series with th...

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Problems solved by technology

[0005] 3. In the state of short-circuit in the electrical circuit, the traditional technology has a scheme of connecting the current-limiting resistor in series with the circuit through switching. The problem is that the main short-circuit circuit must be disconnected first, thus requiring the circuit breaker to have a large short-circuit current Interruption capacity

[0006] 4. The superconducting current limiter has good current limiting effect and superconducting recovery characteristics, but requires an ultra-low temperature operating environment, high investment and operation and maintenance costs; and it is resistive current limiting, with large active power loss and rapid temperature rise, limiting streaming time is limited

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