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High-precision fast measuring circuit and method for wide-range currents in power system

A power system and measurement circuit technology, applied in the field of high-precision and fast measurement circuits, can solve problems such as affecting measurement speed, and achieve the effects of improving measurement accuracy, good scalability, popularization and application value, and fast measurement speed.

Inactive Publication Date: 2014-01-29
STATE GRID CORP OF CHINA +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this solution requires the cooperation of software and hardware to measure the signal twice or even multiple times, and it needs to be tried step by step to achieve the best magnification, which affects the measurement speed

Method used

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  • High-precision fast measuring circuit and method for wide-range currents in power system
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  • High-precision fast measuring circuit and method for wide-range currents in power system

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Embodiment Construction

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like figure 1 and 2 As shown, the high-precision and fast measurement circuit for wide-range current in the power system includes: current transformer 1, signal conditioning circuit, limiter 5, A / D converter 6 and CPU7 connected in sequence,

[0039] The signal conditioning circuit includes a preamplifier 2, a main amplifier 3, and an adaptive amplifier 4 connected in sequence, the preamplifier 2 is connected with the current transformer 1, and the adaptive amplifier 4 is connected with the limiter 5,

[0040]The node between the main amplifier 3 and the adaptive amplifier 4 is connected with three branches, and each branch is provided with an average value extraction circuit 8 and a voltage comparator 9 connected in sequence, wherein the average value extraction circuit 8 is connected to The input end of adaptive amplifier 4, voltage comparator ...

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Abstract

The invention discloses a high-precision fast measuring circuit and method for wide-range currents in a power system. The circuit comprises a current transformer, a signal processing circuit, an amplitude limiter, an A / D converter (analog to digital converter) and a CPU (central processing unit) which are connected in sequence. The signal processing unit comprises a pre-amplifier, a main amplifier and a self-adaptive amplifier which are connected in sequence. The pre-amplifier is connected with the current transformer. The self-adaptive amplifier is connected with the amplitude limiter. The node between the main amplifier and the self-adaptive amplifier is connected with three branches. Each branch is provided with an average value extracting circuit and a voltage comparator which are connected in sequence. Each average value extracting circuit is connected to the input end of the self-adaptive amplifier. Each voltage comparator is connected with a multi-way switch through a first level converter. Due to the fact that the circuit has the automatic level judging and encoding circuits of the multi-stage voltage comparators, appropriate feedback resistance and amplification factors can be selected for the amplifiers automatically, and wide-range current signal measuring precision is increased while fast measuring is achieved.

Description

technical field [0001] The invention relates to the field of analog quantity measurement for power systems, in particular to a high-precision fast measurement circuit and a measurement method for wide-range currents in the power system. Background technique [0002] The current of the power system is an important parameter that reflects the operating state of the power system. During normal operation, the power system needs to obtain the current value for various analysis and calculation of the power system. To protect the safety of systems and equipment, current measuring equipment is one of the necessary equipment for power systems. However, since the current value is affected by the working conditions of the user equipment, the current value varies in a large range during normal operation. Ordinary measuring equipment can only guarantee high measurement accuracy near the rated current value, and the measurement accuracy will decrease when the current value changes in a w...

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 黄振华张大海田质广魏恒胜郑玉实张刚赵秉聪
Owner STATE GRID CORP OF CHINA
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