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Power capacitor operation state monitoring method based on voltage comparison

A technology for power capacitors and operating status, which is applied in the direction of measuring current/voltage, instruments, and measuring electricity. It can solve the problems of power capacitor explosion, temperature rise, and affecting the safe operation of power capacitors, so as to prevent accidents and improve reliability. high effect

Inactive Publication Date: 2018-04-06
SHANDONG UNIV OF TECH +2
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  • Claims
  • Application Information

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Problems solved by technology

The above reasons all make the temperature in the shell rise, accelerate the thermal aging of the insulation, and even cause an explosion accident of the power capacitor due to excessive gas production, which affects the safe operation of the power capacitor

Method used

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Embodiment 1

[0022] Such as Figure 1-2 As shown, the method for monitoring the operating state of power capacitors based on voltage comparison of the present invention includes the following steps:

[0023] 1) After the measuring device is started, pretreatment is carried out. First, self-inspection is performed. The self-inspection error gives a device fault signal. After the self-inspection is normal, first obtain it from the secondary circuit of the voltage transformer TV of the substation bus where the complete set of power capacitor C is located. Bus voltage value U;

[0024] 2) Through the logical operation unit, the theoretical value U'c of the operating voltage of the power capacitor C is calculated, U'c=U / (1-β), where β is the rated reactance rate of the complete set of power capacitor C under power frequency ;

[0025] 3) Obtain the actual operating voltage value Uc of the power capacitor C from the secondary side of the voltage transformer TV connected in parallel to both end...

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Abstract

The present invention relates to the field of power system fault detection technology, especially to a power capacitor operation state monitoring method based on voltage comparison. The method comprises the following steps that: 1) a measurement device obtains a bus voltage value U from a secondary circuit of a voltage transformer TV of a transformer substation bus where a power capacitor C complete device is located; 2) a theoretical value U'c of a running voltage of the power capacitor C is obtained through calculation, wherein U'c=U / (1-[Beta]; 3) an actual running voltage value Uc of the power capacitor C is obtained from a secondary side of the voltage transformer TV being connected in parallel with two ends of the power capacitor C; and 4) the theoretical value U'c of the running voltage of the power capacitor C and the measured actual running voltage value Uc of the power capacitor C are analyzed and compared. The method provided by the invention can perform voltage parameter measurement and analysis calculation in the actual running condition to really reflect the running state of the power capacitor, performs three-phase simultaneous online detection to allow the measurement result credibility to be higher, and can discover defects which cannot be discovered in a low voltage and a small current, of a black-out test.

Description

technical field [0001] The invention relates to the technical field of power system fault detection, in particular to a method for monitoring the operating state of a power capacitor based on voltage comparison. Background technique [0002] In order to improve the utilization efficiency of grid equipment, improve the power factor of power supply and consumption equipment, and reduce the power loss in power transmission and transformation and power consumption, it is necessary to compensate the reactive power consumed by resistive and inductive loads in the power system. Therefore, the power system substation is equipped with A large number of complete sets of power capacitors, he is the most traditional, the most widely used and the largest number of reactive power compensation equipment in the power system. , Improve power quality, reduce power loss, increase the transmission capacity of transmission and distribution lines and power transformers, and play a very good role....

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/12G01R19/165
CPCG01R19/16576G01R31/1263G01R31/50
Inventor 咸日常刘兴华孙学锋王涛于洋安韵竹胡元潮
Owner SHANDONG UNIV OF TECH
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