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Harmonic protection device for capacitor bank

A capacitor bank and protection device technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as fault expansion, protection devices cannot act in time, and achieve the effect of providing protection

Inactive Publication Date: 2015-05-27
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In actual operation, it is found that the result obtained by this algorithm is often lower than the actual effective value of the current, resulting in the protection device not being able to act in time to cut off the capacitor bank, thereby expanding the fault

Method used

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  • Harmonic protection device for capacitor bank
  • Harmonic protection device for capacitor bank
  • Harmonic protection device for capacitor bank

Examples

Experimental program
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Embodiment Construction

[0023] See figure 1 The harmonic protection device of the capacitor bank of the present embodiment includes a CPU unit 20, a communication interface 22 connected to the CPU unit 20, a current and voltage sampling unit 21 connected to the CPU unit 20 for current and voltage sampling of the capacitor bank A protection device 23 connected to the CPU unit 20 and controlled by the CPU unit 20 to cut off the capacitor bank, and a switching value input unit 24 connected to the CPU unit for detecting position information such as circuit breakers and isolating knife switches. The protection device includes: a relay connected to the CPU unit, which is used to control the circuit breaker and the isolating switch to disconnect the capacitor bank from the bus.

[0024] The CPU unit obtains the fundamental current RMS value I on the capacitor bank through the current and voltage sampling unit 1 And the effective value of each harmonic I n , where: n is the harmonic order, and the range of...

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Abstract

The invention provides a harmonic protection device for a capacitor bank. The harmonic protection device comprises a CPU unit, a current and voltage sampling unit and a protection device, wherein the CPU unit calculates the true root mean square I of a current on the capacitor bank after obtaining the root mean square I1 of a fundamental current and the root mean square In of each subharmonic on the capacitor bank, and when I is larger than 1.3 IN, the capacitor bank is turned off by the protection device under the control of the CPU unit; IN is the rated current of the capacitor bank. The harmonic protection device not only can realize conventional protection functions on over-current, over-voltage and the like, but also can calculate 2-13 subharmonics in the current and voltage in real time, comprehensively provide harmonic protection functions on the single harmonic current, single harmonic voltage, full current, full voltage and the like, and better provide protection for the capacitor bank.

Description

[0001] This application is a divisional application of an invention patent application with the patent application number 201010582083.1, the application date is December 10, 2010, and the title is "Harmonic Protection Method for Capacitor Bank". technical field [0002] The invention relates to a harmonic protection device for a power capacitor bank in a power system. Background technique [0003] In recent years, with the development of power systems and the wide application of power electronics technology, the structure of power loads has undergone major changes. The operation of a large number of nonlinear loads such as electric arc furnaces, electrified railways, thyristor voltage regulation and frequency conversion adjustment devices has become the main harmonic source in the power grid, injecting a large amount of harmonic current into the power system, resulting in voltage waveform distortion of the power grid. Harmonics have different degrees of impact on the normal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/16
Inventor 曹良罗皎虹张雄伟许箴
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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