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Secondary side output signal cable transmission device of voltage transformer

A technology for voltage transformer and output signal, which is applied in the field of output signal cable transmission device on the secondary side of voltage transformer, can solve the problems of attenuation and low signal accuracy, and achieves investment saving, high signal transmission accuracy and strong anti-interference performance. Effect

Active Publication Date: 2010-11-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In short, the disadvantage of the existing technology is that the output voltage signal of the voltage transformer is attenuated through cable transmission, so the accuracy of the transmitted signal is low

Method used

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  • Secondary side output signal cable transmission device of voltage transformer
  • Secondary side output signal cable transmission device of voltage transformer
  • Secondary side output signal cable transmission device of voltage transformer

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] Such as figure 1 , image 3 with Figure 4 As shown, the voltage transformer secondary side output signal cable transmission device is composed of a cable 1, and a CPU-containing local signal transmitter 2 and a signal restoration receiver 3 at the front and rear ends. The CPU-containing local signal transmitter includes a small voltage mutual inductance Device 5, CPU6, analog / digital converter 7, input operational amplifier 8, digital / analog converter 9 with 4 to 20mA or 0 to 20mA current output. Among them, the small voltage transformer can convert the AC 0 to 100V or 0 to 57.7V voltage output by the voltage transformer into an AC 0 to 5V voltage, and the signal is input to the analog / digital converter after passing through the proportional adder composed of the operational amplifier. , the CPU6 controls the analog / digital converter 7 and the reference voltage source 15 to convert the input signal into 4 to 20mA or 0 to 20mA current.

[0036] The signal restoration...

Embodiment approach 2

[0041] Such as figure 2 with Figure 5 As shown, the output signal cable transmission device of the voltage transformer secondary side is composed of a cable 1 and its local signal transmitter 4 and signal restoration receiver 3 at the front and rear ends. The local signal transmitter 4 includes a small voltage transformer 5, an input operational amplifier 8, and a voltage / current converter 14 whose input is an AC signal and outputs a 4-20mA or 0-20mA current signal. Among them, the small voltage transformer can convert the AC 0 to 100V or 0 to 57.7V voltage output by the voltage transformer into an AC 0 to 5V voltage. After the signal passes through the proportional adder formed by the operational amplifier, it is input to the input as an AC signal and the output is In the voltage / current converter of 4 to 20mA or 0 to 20mA current signal, output 4 to 20mA or 0 to 20mA current signal.

[0042] The signal restoration receiver 3 includes a current / voltage converter 10 , an o...

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Abstract

The invention discloses a secondary side output signal long-distance no-loss cable transmission device of a voltage transformer; the transmission device comprises a cable, and a local signal transmitter and a signal recover receiver which are respectively connected on the front end and the rear end of the cable; the local signal transmitter converts the AC voltage output by the secondary side of the voltage transformer into current signals, the cable transmits the signals to the signal recovery receiver, and the receiver reduces the signals into voltage signals. The signals have no loss during the transmission process, and the transmission precision is high. The device is applicable to 500kV,220 kV,110 kV,35 kV,60 kV,10 kV,380kV and other voltage transformers with various voltage classes.

Description

technical field [0001] The invention relates to the improvement of an electric signal transmission device, in particular to a secondary side output signal cable transmission device of a voltage transformer. Background technique [0002] The accuracy of electric energy measurement depends on the error of electric energy meter, current transformer (CT), potential transformer (PT), and the error of PT secondary circuit voltage drop. In recent years, in production, the accuracy of electric energy meters has been generally increased from 1.0 to 0.5, and the accuracy of metering transformers has been increased from 0.5 to 0.2, creating conditions for improving the accuracy of electric energy metering devices. At present, in the electric energy metering system, the only problem that has not been well resolved is the metering error problem caused by the voltage drop of the PT secondary circuit, which seriously affects the electric energy metering accuracy. Due to the existence of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/00
Inventor 李岩松齐郑刘君
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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