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Online calibration method for error characteristics of voltage transformer for power system

A technology for voltage transformer and error characteristics, which is applied in the field of on-line verification of error characteristics of voltage transformers used in power systems, and can solve problems such as difficulty in detecting voltage transformers during power outages in power grids

Inactive Publication Date: 2010-06-09
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide an online verification method for the error characteristics of voltage transformers used in power systems. This verification method can realize the detection of error characteristics of voltage transformers in operation without power failure, and solve the problem of power grids that are difficult to detect voltage transformers during power outages. It also reduces the cost of power grid operation and maintenance, and improves the reliability of power grid operation

Method used

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  • Online calibration method for error characteristics of voltage transformer for power system
  • Online calibration method for error characteristics of voltage transformer for power system
  • Online calibration method for error characteristics of voltage transformer for power system

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Embodiment 1

[0059] see figure 1 , Put the special power frequency voltage proportional standard device directly into the power grid, and the VT X (Here is an electromagnetic voltage transformer) in parallel on the line, and the transformer error measuring device constitutes a detection loop.

[0060] This wiring method is suitable for on-line verification of voltage transformers with semi-insulated structures in distribution networks, for on-line verification of line voltage transformers for 110kV and 220kV voltage levels, and can also be used for higher voltage levels (such as 500kV, 750kV or even 1000kV) ) The voltage transformer on the line is checked online. It is not only suitable for electromagnetic voltage transformers (including tank voltage transformers for 110kV~500kV GIS), but also for capacitive voltage transformers of various voltage levels.

[0061] When the voltage level of the calibrated voltage transformer is not higher than 110kV, the type of special power frequency voltage p...

Embodiment 2

[0065] figure 2 with image 3 Among them, the voltage transformer to be calibrated is a fully insulated structure, figure 2 The special power frequency voltage ratio standard device used in the image 3 In the middle, two semi-insulating structure special power frequency voltage ratio standard devices are used. Fully insulated voltage transformers are mainly used in power distribution networks with voltage levels of 35kV and below, including 10kV and 20kV. In addition to the different structure of the special power frequency voltage ratio standard device, figure 2 and image 3 Verification method and figure 1 no difference.

[0066] The secondary output voltage of the fully insulated voltage transformer in the distribution network is usually 100V, and the secondary output voltage of the semi-insulated voltage transformer in the distribution network is usually Two sets of special power frequency proportional standard devices are used to verify the fully insulated voltage transf...

Embodiment 3

[0068] Figure 4 with Figure 5 The second method is described. Now a short-time offline voltage transformer is obtained according to the conventional method to obtain the error characteristics, and then it is put into the line to verify other voltage transformers. In the conventional method, an ordinary standard voltage transformer can be used as a standard device to verify the voltage transformer to be calibrated. The insulation level of ordinary standard voltage transformers is not high, and usually only requires short-time power frequency withstand requirements of 1.3 to 1.5 times the rated working voltage. In the routine calibration process, a power circuit composed of a voltage regulator and a step-up transformer can be used to slowly apply voltage to the calibrated voltage transformer and the standard voltage transformer.

[0069] In the conventional testing method, the tested voltage transformer is set according to the rated secondary load and the lower limit load. The te...

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Abstract

The invention relates to an online calibration method for error characteristics of a voltage transformer for a power system, which is an online calibration method for the error characteristics of the voltage transformer working in an energized state in a power network under the condition that the power network is not powered off. Particularly, a special power frequency voltage proportion standardized device of which the insulation level is not lower than that of the voltage transformer to be calibrated is adopted as a standard and is connected with the power network for online calibration of the error characteristics of the running voltage transformer; or a voltage transformer, which is offline in a short term, is calibrated by a normal detection method to acquire error detection data, and then is connected with the power network to serve as a reference voltage transformer for the online calibrate of other inphase voltage transformers and the necessary processing of measured data errors. By means of the calibration method, the error characteristics of the running voltage transformer can be calibrated in the power-on state, so the problem that the power network can be hardly powered off for calibration is solved, the cost for running and maintaining the power network is reduced and the running reliability of the power network is improved.

Description

Technical field [0001] The invention relates to an online verification method for the error characteristics of a voltage transformer for a power system, and belongs to the field of calibration, verification and detection of power equipment. Background technique [0002] Transformers for power systems, including voltage transformers and current transformers, are metering devices, relay protection devices, automatic devices, and monitoring and recording devices that transmit information about high voltage and high current of the power grid to the secondary side of low voltage and low current. A special transformer for devices and other equipment. The error performance of transformers used in power systems directly affects the accuracy of power system measurement and metering and the reliability of relay protection devices. According to the requirements of the electric energy measurement system and transformer verification regulations, transformers should be regularly tested for er...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 王晓琪余春雨吴士普李璿汪本进费烨陈晓明毛安澜陈心佳王铃
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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