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Multifunctional integrated circuit protection device

A circuit protection, multi-functional technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as not very good results

Active Publication Date: 2019-06-28
上海舒盈科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main methods and products to solve the resonance and overvoltage of the 6-66KV power grid system in the domestic and foreign markets include: metal oxide arresters, resistance-capacity absorption protection devices, overvoltage devices such as arc suppression coils and TBP arc suppression cabinets, etc., and their effects Neither is very good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: cut off the no-load transformer to prevent cut-off overvoltage test;

[0034] When the vacuum circuit breaker cuts off the no-load transformer, it may generate a cut-off overvoltage as high as 200kV at both ends of the fracture. The multi-functional integrated circuit protection device provided by the present invention passes the no-load transformer cut-off test.

[0035] Figure 4 Shown is the wiring diagram for the no-load transformer removal test.

[0036] After testing, the maximum value of the cut-off overvoltage on the power supply side appears in phase C with an amplitude of 7880V, and the maximum value of the cut-off overvoltage on the load side appears in phase A with an amplitude of only 8487V. Using the multifunctional comprehensive circuit protection device provided by the invention can play a good protective role in preventing cut-off overvoltage.

Embodiment 2

[0037] Example 2: Single-phase intermittent arc grounding test

[0038] Single-phase grounding is the main fault form of the power system. Intermittent arcing grounding causes electromagnetic oscillation between inductors and capacitors, forming arcing grounding overvoltage throughout the entire system.

[0039] In a distribution network where the cable-based capacitive current reaches more than 100A, the test wave chart of A-phase single-phase intermittent arc grounding occurs:

[0040] Figure 5 It is the test wave chart of single-phase intermittent arc grounding without multi-functional integrated circuit protection device installed;

[0041] Image 6 It is the test wave chart of the single-phase intermittent arc grounding when the multi-functional integrated circuit protection device is installed;

[0042] After testing, there is no multifunctional integrated circuit protection device installed in the circuit, the maximum peak voltage of phase A of the normal phase reac...

Embodiment 3

[0045] Embodiment 3: Rapid breaking test of fault short-circuit current

[0046] As the transmission capacity of the power system continues to expand, the short-circuit current level of the power grid continues to increase, and there will be accidents where the maximum short-circuit current exceeds the rated short-circuit breaking current of the circuit breaker, and the arc extinguishing failure of the circuit breaker cannot break the short-circuit fault. damage electrical equipment.

[0047] The multi-functional comprehensive protection device for the power grid can effectively damp and suppress the rising rate and amplitude of the transient recovery voltage of the vacuum circuit breaker, and it has the function of commutation, energy dissipation, magnetic arc extinguishing.

[0048] Use the same vacuum circuit breaker to carry out 50KA three-phase short-circuit current breaking test respectively.

[0049] Figure 7 Shown is the three-phase circuit direct test wiring diagram;...

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Abstract

The invention provides a multi-functional integrated circuit protection device applied to a 6-66kv power grid system. The multi-functional integrated circuit protection device comprises a composite circuit formed by nonlinear damping devices Rk1 and Rk2 and a nonlinear damping resistor RG3 having the characteristic of ultra-low impedance and an oversized energy capacity. According to the invention, the multi-functional integrated circuit protection device can effective damp and suppress the rising rate and amplitude of transient recovery voltage of a vacuum circuit breaker, and prevent the generation of over voltage. In the on-off of the circuit breaker, operating over voltage of oscillation generation due to mutual conversion of electric energy and magnetic energy is damped and suppressed to switch on-off of high short circuit capacity of the vacuum circuit breaker. Through the combined application of the nonlinear damping resistors and the circuit design of an artificial neutral point O, the multi-functional integrated circuit protection device has the functions of excellent lightning protection, damping and suppression of phase-phase and phase-ground resonance and operating over voltage, and especially excellent suppression of single-phase intermittent arc grounding over voltage, and serves to eliminate electric arc over voltage.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a multifunctional comprehensive circuit protection device applied to a 6-66kv power grid system. It can prevent the generation of cut-off overvoltage, effectively damp and suppress the rising rate and amplitude of the transient recovery voltage of the vacuum circuit breaker. Realize breaking with high short-circuit capacity. It has super lightning protection, damping and suppression of phase-phase, phase-ground resonance overvoltage and operating overvoltage, and can strongly inhibit single-phase intermittent arc grounding overvoltage. Background technique [0002] Circuit breaker is a switchgear that is widely used in high-voltage electrical appliances, and it plays a very important role in maintaining the safe, economical and reliable operation of the power system. According to the arc extinguishing medium used, it can be divided into oil circuit br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H9/08
Inventor 朱仲彦
Owner 上海舒盈科技股份有限公司
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