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CT polarity testing device

A technology of polarity testing and anode, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., which can solve the problems of high cost, high precision requirements, and small current, and achieve low energy consumption, low power consumption, and convenience. carrying effect

Active Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the current transformer is relatively large, the secondary induced current will be very small, which requires high accuracy of the ammeter on the secondary side, and the cost will be high, and this method cannot be used for currents with relatively large transformation ratios. The transformer responds very well

Method used

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] figure 1 It shows the circuit structure of the embodiment of the present invention, and the circuit connection structure between it and the current transformer CT.

[0017] Such as figure 1 As shown, the embodiment of the present invention includes resistor R1, resistor R2, resistor RS, diode D, relay CJ, switch AN1, switch AN2, switch AN3, single pole double throw switch K2, switch K1, DC power supply EC1, DC power supply EC2, lighting Diode LED1, Light Emitting Diode LED2.

[0018] Specifically, the first end of the resistor R1 is connected to the first end of the switch AN2, the second end of the resistor R1 is connected to the anode of the diode D, and the second end of the switch AN2 is simultaneously connected to the first end of the SPDT switch K2. The moving terminal K21, the first terminal of the switch K1, and the ...

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Abstract

The invention discloses a CT polarity testing device, comprising a resistor (R1), a resistor (R2), a resistor (RS), a diode (D), a relay (CJ), a switch (AN1), a switch (AN2), a switch (AN3), a single-pole double-throw switch (K2), a switch (K1), a DC power supply (EC1), a DC power supply (EC2), a light emitting diode (LED1), and a light emitting diode (LED2). The CT polarity testing device satisfies the practical needs of the relay protection working site, and has advantages of sensitivity in testing, easy operation, portability, reliability and practicability. The CT polarity testing device can greatly improve the working efficiency and has direct and specific testing lamp indication. Furthermore, the CT polarity testing device is less in electric consumption, low in cost, low in energy consumption, and is applicable to the long time testing.

Description

technical field [0001] The invention relates to the technical field of power equipment maintenance and power meter testing, in particular to a CT polarity testing device. Background technique [0002] Based on the principle of electromagnetic induction, a current transformer (CT) converts a large current on the primary side into a small current on the secondary side for use. It is usually composed of a closed iron core and a winding. Its primary side winding is connected in series in the circuit of the current to be measured, and the secondary side winding is connected in series in the measuring instrument and the protection circuit. When the current transformer is working, the secondary side circuit is always closed, the working state of the current transformer is close to short circuit, and the secondary side cannot be opened. [0003] In the secondary production work of the power system, the current transformer replacement and overhaul projects are often involved, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06
Inventor 崔良张立辉刘守瑞李晓影乔辉王江涛
Owner STATE GRID CORP OF CHINA
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