Equivalent simulation method of small-range current transformer

A current transformer and equivalent simulation technology, applied in the field of effective simulation, can solve the problem that the current power amplifier cannot simulate the small-scale current transformer, etc.

Pending Publication Date: 2020-10-23
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an equivalent simulation method for a small-range current transformer to so

Method used

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  • Equivalent simulation method of small-range current transformer
  • Equivalent simulation method of small-range current transformer
  • Equivalent simulation method of small-range current transformer

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] Current transformer: A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction for measurement.

[0033] Current power amplifier: The current power amplifier is a high-precision, high-current, fast-response, linear current power amplifier specially developed for the CT characteristics of the power system. The small signal output by the simulation system can be amplified to the CT rated value and system fault level for test use.

[0034] An embodiment of the present invention provides an equivalent simulation method for a small-range current transformer to solve the technical problem that conventional current power amplifiers cannot accurately simulate the small-range current transformer.

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associ...

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Abstract

The invention provides an equivalent simulation method of a small-range current transformer. The equivalent simulation method comprises the following steps: measuring a resistance value of a samplingresistor in a small-current acquisition board card of a control protection device; in a power system real-time simulation system, simulating a secondary current value of the current transformer, and performing I/V conversion according to the resistance value and the secondary current value to obtain a corresponding voltage signal; converting the voltage signal into a voltage analog quantity and outputting the voltage analog quantity to the low current acquisition card of the control protection device; and the low current acquisition card obtains a low current value according to the voltage analog quantity and the resistance value, thereby realizing equivalent simulation of the small-range current transformer. According to the method, the accurate equivalence of the small-range current transformer is realized in an economical and flexible manner, the precision of the output small current is high, no additional test equipment is needed, the economy is better, the parameter setting and adjustment in the I/V conversion process are flexible, and the adaptive performance is good.

Description

technical field [0001] The invention relates to the technical field of electric equipment dynamic model detection, in particular to an equivalent simulation method for a small-range current transformer. Background technique [0002] In the dynamic model test of power equipment, the power system real-time simulator is used to simulate the power primary system. After the system fails, the simulation system converts the current value of the secondary side of the current transformer and outputs it in the form of small signal analog. The current power amplifier reproduces the fault current characteristics of the secondary side of the current transformer. Under special circumstances, there are current transformers with a small range in the power grid system, and their rated current values ​​are not within the normal operating range of conventional current power amplifiers. The use of current power amplifiers cannot accurately output current values, resulting in the inability to co...

Claims

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Application Information

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IPC IPC(8): G01R35/02
CPCG01R35/02Y02E60/00
Inventor 索江镭刘琨陈志光李一泉陈桥平邓旭阳袁亮荣王增超
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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