Arrester full current continuous amplifying circuit and method thereof

An amplifying circuit and full current technology, applied in the direction of measuring current/voltage, instruments, measuring electricity, etc., can solve the problems of poor detection accuracy, high detection cost, and failure to promote, and achieve improved accuracy, low detection cost, and easy promotion. Effect

Inactive Publication Date: 2010-06-30
SHANGHAI ELECTRICAL AUTOMATION R&D INST
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Problems solved by technology

The two fatal flaws of the conventional detection method are: poor detection accuracy, inability to truly reflect the working status of the arrester, and high detection cost. Due to the need to use high-voltage PTs with sampling voltages, they cannot be popularized

Method used

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  • Arrester full current continuous amplifying circuit and method thereof
  • Arrester full current continuous amplifying circuit and method thereof

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Embodiment Construction

[0015] The present invention will be further described in detail through specific embodiments below.

[0016] A kind of lightning arrester full-current equal-amplitude amplifying circuit of one of the present invention, comprises operational amplifier (4) and field effect tube (3); Current input terminal (1) connects the normal phase input terminal of operational amplifier, and the output terminal of operational amplifier connects The current output terminal (2) is connected to the field effect transistor (3), and the source of the field effect transistor (3) is connected to the inverting input terminal of the operational amplifier (4).

[0017] A second full-current equal-amplitude amplification method of a lightning arrester of the present invention comprises the following steps:

[0018] Step 1: Input the full leakage current to the positive phase input terminal of the operational amplifier (4) of model TL062 through the current input terminal (1) to amplify the full leakag...

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Abstract

The invention discloses an arrester full current continuous amplifying circuit and a method thereof. The method can promote the detecting precision, is capable of really reflecting the working state of the arrester, has low detecting cost, and is easy to popularize. The technical scheme of the invention is that the arrester full current continuous amplifying circuit comprises an operational amplifier and a field-effect tube, wherein a current input end is connected with a normal phase input end of the operational amplifier; an output end of the operational amplifier is connected with a current output end and the field-effect tube; and the source electrode of the field-effect tube is connected with an inverted phase input end of the operational amplifier.

Description

technical field [0001] The invention relates to a full current constant amplitude amplification circuit and method, in particular to a lightning arrester full current equal amplitude amplification circuit and method. technical background [0002] The full leakage current of the arrester includes two parts: capacitive leakage current and resistive leakage current. Among them, the resistive leakage current is a technical parameter that truly reflects the operating state of the arrester. Since the detection of resistive leakage current must sample the full leakage current and voltage, the resistive current can be calculated by calculating the angle between the voltage and the full current, and then using the trigonometric function relationship. Therefore, the resistive current usually only accounts for 10% to 15% of the full current, and the error of the resistive current value calculated after two multiplications is relatively large. Two fatal defects of the conventional det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R19/00
Inventor 李新育陈冰朱蕴石磊
Owner SHANGHAI ELECTRICAL AUTOMATION R&D INST
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