A power testing sampling protection unit

A technology of protection unit and power test, which is applied in the direction of protection, electrical components and emergency protection circuit devices that respond to fault currents, can solve problems such as differences in insulation characteristics, achieve high sensitivity, reduce labor intensity, and test simple and efficient Effect

Inactive Publication Date: 2009-08-05
KGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the conventional insulation preventive test, there is a certain difference between the insulation characteristics of the equipment itself and the "cold state" under operating conditions

Method used

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  • A power testing sampling protection unit
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Experimental program
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Embodiment 1

[0023] This embodiment is the best implementation mode of the present invention, as figure 1 As shown, the power test sampling protection unit of the present invention is connected in series on the ground wire of the equipment under test, and is composed of a control circuit, a voltage divider circuit and a protection circuit connected in parallel with each other. The circuit is composed of a discharge tube 2, and the voltage dividing circuit is composed of a diode bridge stack. The diode bridge stack is composed of 10 diodes, and the 10 diodes are divided into 2 sides on average. The measurement terminals are connected to both ends of the power test sampling protection unit. .

[0024] When the equipment is working normally, the shorting piece 1 of the power test sampling protection unit is turned on; when it is necessary to test the equipment, disconnect the shorting piece 1 to open the circuit, then the diode is turned on, and the voltage of the final screen is less than 5V...

Embodiment 2

[0027] The power test sampling protection unit structure of this embodiment is the same as that of Embodiment 1, the difference is that the diode bridge stack is composed of 4 diodes, and the 4 diodes are evenly divided into 2 sides, as figure 2 As shown, in the case of normal operation of the equipment, the shorting piece 1 of the power test sampling protection unit is turned on; when the equipment needs to be tested, the shorting piece 1 is disconnected to open the circuit, the diode is turned on, and the voltage of the final screen is less than 5V, maintain the 5A power frequency current after it is turned on, connect a meter to the measurement terminal, and conduct a sampling test on the device.

[0028] In order to facilitate the live test, ensure the safety of on-site use, and prevent accidents (such as the disconnection of the measurement lead) from causing the open circuit of the end screen of the equipment, the necessary sampling protection unit should be installed at...

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Abstract

The invention relates to the power electronic technology field, in particular to a sampling protection unit used to test the insulation of the capacitive equipment. The protection unit is connected with the grounding wire of the tested equipment in series and is composed of a control circuit, a bleeder circuit and a protection circuit connected with each other in parallel. The control circuit is composed of a plurality of parallel connected short contact pieces. The bleeder circuit is composed of a diode bridge which makes the end screen smaller than the 5V. The protection circuit is composed of a discharge tube with the test end connected with the both ends of electric power test sampling protection unit. The input impedance of the electric power test sampling unit is too low, and is capable of being connected with the grounding wire of the tested equipment, which makes the on-line testing convenient, ensures the on-site use safety and prevents the accidental electric shock.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a sampling protection unit for testing the insulation and electrification of capacitive equipment. Background technique [0002] At present, in the detection of capacitive equipment, if the voltage carried by the equipment is very high, direct measurement with power on will bring great danger to personal safety, so the power must be turned off before detection. However, the experience of online monitoring and live testing at home and abroad shows that for the analysis of test results, the judgment of the development trend is more important, and the diagnostic method of relative measurement and comprehensive analysis can effectively eliminate the influence of external factors on the measurement results. At present, the capacitive testing equipment used in the preventive test of the insulation of high-voltage electrical equipment has problems such as many test instruments...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/16H02H7/00H02H3/16
Inventor 蔡清伟张彤区建斌徐振华汪民邓利民霍锦强张广昕
Owner KGE
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