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Protection device outlet relay circuit impedance matching calculation method and system

A relay circuit and impedance matching technology, applied in the computer field, can solve the problems of poor relay accuracy, relay coil resistance mismatch, affecting reliable operation of power system protection devices, etc., and achieve the effect of improving reliability

Active Publication Date: 2019-03-26
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of the relay, its operating voltage is often in the range of 40% to 80%, which is highly discrete and does not match the resistance of the relay coil, resulting in poor accuracy of the relay and affecting the reliable operation of the power system protection device.

Method used

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  • Protection device outlet relay circuit impedance matching calculation method and system
  • Protection device outlet relay circuit impedance matching calculation method and system
  • Protection device outlet relay circuit impedance matching calculation method and system

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0036] like figure 2 As shown in the figure, a method for calculating impedance matching of an outlet relay circuit of a protection device includes the following steps:

[0037] Step 1, according to the input voltage range of the outlet relay circuit, calculate the input target voltage of the outlet relay circuit.

[0038] The input target voltage is the ideal output relay circuit input voltage, and the specific formula is as follows:

[0039]

[0040]

[0041] Among them, U option is the input target voltage; the input voltage range is [U nQD , U QD ]; U nQD option ≤U QD ;U nQD Equal to 55% of the input power supply voltage, the input power supply voltage is generally...

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Abstract

The invention discloses a protection device outlet relay circuit impedance matching calculation method. The method comprises the steps that the input target voltage of an outlet relay circuit is calculated according to the input voltage range of the outlet relay circuit; according to the input target voltage, the action current of a relay and the resistance of a relay coil, the resistance of series resistors of the relay is calculated; the percentage of the resistance of the relay coil to the total resistance of the outlet relay circuit is calculated; and according to the percentage, the action voltage range of the relay is calculated. According to the invention, the reliable action voltage range of the relay is calculated according to the input voltage range of the outlet relay circuit and the percentage of the resistance of the relay coil; the voltage matches the rated resistance of the relay; and the reliability of a power system protection device is improved.

Description

technical field [0001] The invention relates to a method and a system for calculating impedance matching of an outlet relay circuit of a protection device, and belongs to the field of computers. Background technique [0002] figure 1 It is the outlet relay circuit of the protection device, including relays and resistors. Of course, multiple relays and multiple resistors may be connected in series. At this time, multiple resistors can be equal to one large resistor, and the coils of multiple relays are equal to one large resistor in resistance value. The coil, the outlet relay circuit of the protection device should be within the range of 55% to 70% of the input power supply voltage, 55% of which is reliable without action, and 70% of which is reliable. However, due to the inherent characteristics of the relay, its operating voltage is often in the range of 40% to 80%, the dispersion is large, and the resistance of the relay coil does not match, resulting in poor relay accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G06F17/18
CPCG01R31/3278G06F17/18
Inventor 徐丽青吴焱肖文张玮阮青亮卢家力岳峰陈新之余华武
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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