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Switch restrike limiting device

A limiting device and switch technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve problems such as re-ignition and electrical equipment insulation damage, and avoid serious Combustion, the effect of preventing overvoltage

Inactive Publication Date: 2017-08-18
ANHUI ONESKY ELECTRIC TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the circuit breakers in these power facilities can effectively disconnect the connection between the electrical load and the grid, there are also shortcomings: when the inductive or capacitive load is interrupted, the energy stored in the inductance or capacitance will be released quickly , and generate a fast recovery voltage at both ends of the breaker's fracture; at this time, if the speed of recovery voltage at both ends of the breaker is higher than the recovery speed of the insulation of the circuit breaker's arc extinguishing chamber, there will be a re-ignition phenomenon during the breaking process. This results in a high multiple restrike overvoltage, causing damage to the insulation of electrical equipment in the power system

Method used

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  • Switch restrike limiting device

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Embodiment Construction

[0014] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0015] see figure 1 , the composition of the switch restart limiting device is as follows:

[0016] Both ends of the circuit breaker 2 are connected in parallel with a reflashing branch that limits the fracture of the circuit breaker. The circuit breaker fracture restrike branch circuit is a switch 3 connected in series, a damping resistor 4 and a capacitor 5, and a zinc oxide assembly 6 connected in parallel to the two ends of the serially connected damping resistor 4 and capacitor 5, wherein the circuit breaker 2 The control terminal is electrically connected to the output terminal of the controller 7, and the control terminal of the switch 3 is electrically connected to the auxiliary switch of the circuit breaker 2; the switch 3 is a mechanical contact switch (or an electronic non-contact switch), and a damping resistor The resista...

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Abstract

The invention discloses a switch restrike limiting device. The device comprises a breaker (2) connected with a circuit in series and a controller (7) electrically connected with the control terminal of the breaker (2), a breaker fracture restrike limiting branch is connected with two ends of the breaker (2) in parallel, the breaker fracture restrike limiting branch comprises a switch (3), a damping resistor (4) and a capacitor (5) which are connected in series, a zinc oxide component (6) is parallelly connected with the damping resistor (4) and the capacitor (5) which are connected in series, the control terminal of the switch (3) is electrically connected with the auxiliary switch of the breaker (2), when the controller (7) controls breaker (2) breaking, the auxiliary switch of the breaker (2) delays to break the switch (3). According to the invention, the device can not have overvoltage when breaking inductive or capacitive load, restriking of breaker (2) fracture is avoided, and the device can be widely applied in breaker restrike-free breaking on the electric circuit.

Description

technical field [0001] The invention relates to a limiting device, in particular to a switch restart limiting device. Background technique [0002] Based on the needs of power operation and power safety, people often connect circuit breakers in series in power circuits, such as various power facilities currently in use. Although the circuit breakers in these power facilities can effectively disconnect the connection between the electrical load and the grid, there are also shortcomings: when the inductive or capacitive load is interrupted, the energy stored in the inductance or capacitance will be released quickly , and generate a fast recovery voltage at both ends of the breaker's fracture; at this time, if the recovery speed of the two ends of the fracture is higher than the recovery speed of the insulation of the circuit breaker's arc extinguishing chamber, there will be a re-ignition phenomenon during the breaking process. This results in a high multiple restrike overvol...

Claims

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Application Information

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IPC IPC(8): H02H9/04H01H73/18
CPCH02H9/042H01H73/18
Inventor 芮骏唐春林
Owner ANHUI ONESKY ELECTRIC TECH
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