A circuit and method for eliminating voltage drop in PT secondary circuit

A secondary circuit and circuit technology, applied in the electric power industry, can solve problems such as compensating voltage harmonics, electromagnetic interference, and overcompensation, and achieve the effects of accurate voltage drop elimination, convenient installation and construction, and easy procurement and production

Active Publication Date: 2015-10-07
钱坤 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Method (4) The compensator needs to lay cables to obtain the comparison signal, there is a certain amount of electromagnetic interference, the compensation voltage also has harmonic problems, and there is a risk of overcompensation

Method used

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  • A circuit and method for eliminating voltage drop in PT secondary circuit
  • A circuit and method for eliminating voltage drop in PT secondary circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] 1. The complete device of the present invention (including resistance module, switching module, voltage follower module, monitoring module, temperature module, power supply module, communication module, display module, which can be quickly connected to the original circuit to eliminate voltage drop.):

[0051] 1. Realize three-phase three-wire, three-phase four-wire PT secondary circuit voltage drop automatic and accurate elimination.

[0052] 2. The device is installed on a rack with an engineering plastic (or cast aluminum) shell, and the working power supply is 220V AC.

[0053] 3. Adopt electronic principle circuit, DSP technology, GPRS (Ethernet) communication technology, and modularize each function.

[0054] 4. The monitoring module monitors the input and output voltage of the following circuit module, the PT secondary circuit voltage, the input and output voltage of the working power supply of the complete set of devices, the device load, the device temperature,...

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PUM

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Abstract

The invention discloses a circuit for eliminating PT secondary circuit voltage drop. The circuit comprises a voltage transformer secondary circuit and an electric energy meter, wherein the outlet end of a voltage transformer in a secondary circuit is connected with a resistance module in parallel, and a wiring terminal of the electric energy meter in the secondary circuit is connected with a voltage follower module in series; the resistance module and the voltage follower module are connected with a switching module, and are controlled by the switching module to be in connecting or disconnecting state simultaneously in the secondary circuit of the voltage transformer. The invention also discloses a method for eliminating PT secondary circuit voltage drop.

Description

technical field [0001] The invention relates to the electric power industry, in particular to a circuit and a method for eliminating the voltage drop of a PT secondary circuit realized based on the principle of a voltage follower. Background technique [0002] DL / T448-2000 "Management Regulations for Electric Energy Metering Management Technology" stipulates the allowable range of voltage drop in the PT secondary circuit of various electric energy metering devices. The pressure drop of the PT secondary circuit is a long-standing problem in the power metering system. In recent years, the research results of solving the problem have been reported one after another. There are mainly the following methods: [0003] (1) Reduce the impedance of the secondary circuit wire. Increase the cross-section of the PT secondary circuit wire, reduce the length of the wire, and reduce the contact resistance of the contact points of the components in the circuit. [0004] (2) Reduce the PT s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 李鹏程肖永王玉萍杨沁晖钱坤
Owner 钱坤
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