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Method for testing capacitance type mutual inductor on site high voltage dielectric loss

A test method and capacitive technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of difficult high-voltage dielectric loss tests of capacitive transformers, threats to field operation equipment, inaccurate test results, etc., to reduce physical Volume and weight, flexible and convenient adjustment, the effect of volume and weight reduction

Active Publication Date: 2008-11-12
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the high test voltage, the equipment in the power supply part is very heavy, requiring large loading and unloading and lifting vehicles to complete the test equipment in place, which poses a great threat to the field operation equipment; and requires a large output power of the power supply (generally not less than 50kVA), the general maintenance power supply is difficult to meet the test requirements
This method can only be used for power frequency testing, and cannot avoid on-site interference, and the test results are inaccurate
Therefore, it is very difficult to conduct high-voltage dielectric loss tests of capacitive transformers on site.

Method used

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  • Method for testing capacitance type mutual inductor on site high voltage dielectric loss
  • Method for testing capacitance type mutual inductor on site high voltage dielectric loss

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Experimental program
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Embodiment

[0032] This embodiment includes the following method steps (see figure 1 , 2 ):

[0033] (1) Using frequency conversion series resonance method:

[0034] The series resonant circuit is composed of building block adjustable reactor L and the tested capacitive transformer (Cxa, Cxb, Cxc) in series;

[0035] The power supply of the series resonant circuit is composed of variable frequency power supply BPDY and excitation transformer B, the primary of excitation transformer B is connected to the output terminal of variable frequency power supply BPDY (see figure 1 );

[0036] (2) The method of three-phase parallel connection and simultaneous pressurization is adopted:

[0037] That is, the three-phase capacitive transformers (Cxa, Cxb, Cxc) under test are connected in parallel and then pressurized at the same time;

[0038] (3) Control the resonant frequency at 50±1Hz by adjusting the overlapping mode and tap position of the building block adjustable reactor L;

[0039] (4) ...

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Abstract

The invention relates to a testing method for the field high-voltage dielectric dissipation of capacitive transformers, which adopts a frequency modulation series resonance set-up and a cordwood reactance for lap join compensation, three phases are connected in parallel and pressured at the same time, and the three phases are measured one by one or at the same time, thereby overcoming a plurality of defects of the testing power of the traditional method of large volume, cumbersome equipment, troublesome operations and certain influence on the onsite safe operation, etc. The whole testing device has the advantages of less parts, small volume, light weight and functions of anti-interference and testing three to-be-tested devices at the same time, thus being suitable for application on site.

Description

technical field [0001] The invention relates to a method for measuring the on-site high-voltage dielectric loss of a capacitive transformer. It is suitable for on-site testing of capacitive transformers with voltage levels of 220kV and below. Background technique [0002] At present, the on-site capacitive transformer high-voltage dielectric loss test uses a power frequency test transformer to obtain the test high voltage. The test requires a power control box, a high-voltage test transformer, a high-voltage standard capacitor, a high-voltage dielectric loss bridge and other equipment. Due to the high test voltage, the equipment in the power supply part is very heavy, requiring large loading and unloading and lifting vehicles to complete the test equipment in place, which poses a great threat to the field operation equipment; and requires a large output power of the power supply (generally not less than 50kVA), the general maintenance power supply is difficult to meet the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R31/00
Inventor 李璠阎春雨刘海峰刘晓冬
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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