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Analysis method and control method of sudden change distance relay in impedance plane

A technology of distance relay and analysis method, applied in electrical components, emergency protection circuit devices, etc., can solve the problem that the relationship between the action boundary of distance protection and the calculated impedance cannot be quantitatively outlined.

Active Publication Date: 2019-07-26
南京合智电力科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an analysis method and analysis system for the action behavior of relays, which are used to analyze the action behavior of the sudden change distance relay, and then solve the current method of analyzing the action behavior of distance protection based on the impedance plane, which only has qualitative features and cannot be quantified The technical problem of clearly delineating the relationship between the action boundary of distance protection and the calculated impedance

Method used

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  • Analysis method and control method of sudden change distance relay in impedance plane
  • Analysis method and control method of sudden change distance relay in impedance plane
  • Analysis method and control method of sudden change distance relay in impedance plane

Examples

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Embodiment 1

[0064] Such as figure 1 As shown, this embodiment provides a method for analyzing the action behavior of the relay, that is, through the constructed impedance plane, the action behavior of the sudden change distance relay is analyzed.

[0065] Wherein, the abrupt amount distance relay described in this embodiment may include an abrupt amount grounding distance relay and an abrupt amount phase-to-phase distance relay, that is, the present embodiment obtains the sudden amount grounding distance relay and the abrupt amount phase-to-phase distance when the line is short-circuited in the forward / reverse direction. The equation of action of the relay.

[0066] The analysis method of the action behavior of the relay is because the secondary equipment such as general protection and wave recorder can record the data of 2 to 4 cycles before the system disturbance, and the wave recording file generated by the existing IED (Intelligent Electronic Device) equipment can be used to quantitat...

Embodiment 2

[0150] On the basis of Embodiment 1, this embodiment provides a control method for a relay, such as Figure 4 As shown, the control method includes the following steps:

[0151] Step S1, establishing the action equation of the sudden change distance relay based on the impedance plane;

[0152] Step S2, determine the action boundary of the sudden change distance relay according to the above action equation.

[0153] In this embodiment, the method of establishing the action equation of the relay based on the sudden change in the impedance plane in step S1 can be implemented by using the analysis method of the relay action behavior as described in the first embodiment.

Embodiment 3

[0155] Such as Figure 5 As shown, on the basis of Embodiment 1, this embodiment provides a relay action behavior analysis system.

[0156] The relay action behavior analysis system includes:

[0157] The equivalent impedance calculation module is used to solve the equivalent impedance of each sequence subsystem; and

[0158] The action equation building block is used to establish the action equation of the sudden change distance relay based on the impedance plane.

[0159] In this implementation, the action equation of the sudden change distance relay can be implemented by using the analysis method of the action behavior of the relay as described in Embodiment 1.

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Abstract

The present invention relates to an analysis method of a fault component impedance relay under an impedance plane and a control method. The analysis method comprises a step of analyzing the action behaviors of the fault component impedance relay by the constructed impedance plane, namely a step Sa of when an electric power system goes wrong, dividing the electric power system into the positive, negative and zero sequence sub-systems, and solving the equivalent impedance of the sequence sub-systems; a step Sb of establishing an action equation of the fault component impedance relay based on theimpedance plane. The analysis method of the relay utilizes the current and voltage data to real-timely calculate the positive, negative and zero sequence impedances of the system, so that the distance protection behaviors can be analyzed point by point, at the same time, the calculated positive, negative and zero sequence impedances of the system are accurate, the change of the primary operationmode of the electric power system can be reflected real-timely.

Description

technical field [0001] The invention relates to the technical field of sudden distance distance relays for transmission lines, in particular to an analysis method for analyzing the action behavior of sudden distance distance relays based on an impedance plane. Background technique [0002] Distance protection is a kind of protection widely used in medium and high voltage power system transmission lines. It has the characteristics of being less affected by changes in system operation mode and easy to set; it is also applicable to various systems (grounded or ungrounded), various fault types ( Symmetrical and asymmetrical faults, grounded and ungrounded faults). The essence of distance protection is to reflect the impedance value of the protection installation from the fault point, and judge whether the fault point is located in or outside the area. The overcurrent and undervoltage relays only do simple phasor amplitude comparisons, and the direction relays only do simple pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 冯畅陈勇冯亚东
Owner 南京合智电力科技有限公司
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