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A method and device for quickly judging internal faults of electrical equipment

A technology for electrical equipment and internal faults, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of low efficiency of electrical equipment judgment, and achieve the effect of rapid judgment

Active Publication Date: 2022-05-06
STATE GRID HEBEI ELECTRIC POWER CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to Solve the Technical Problem of Low Efficiency of Internal Fault Judgment of Electrical Equipment

Method used

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  • A method and device for quickly judging internal faults of electrical equipment
  • A method and device for quickly judging internal faults of electrical equipment
  • A method and device for quickly judging internal faults of electrical equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the present invention discloses a method for quickly judging internal faults of electrical equipment, including the following steps:

[0033] S1 extracts the induced voltage data

[0034] Obtain the induced voltage value on the high voltage side of the transformer from the dispatching control system and store the acquired value in the database.

[0035] S2 establish transformer insulation characteristic criterion database

[0036] S201 Establishing an induction voltage calculation model

[0037] The induced voltage calculation model includes transformer model, circuit breaker fracture capacitance, current transformer to ground capacitance, voltage transformer to ground capacitance, lightning arrester to ground capacitance and lead wire to ground capacitance. The transformer model includes transformer equivalent resistance and transformer equivalent capacitance.

[0038] S202 Establish internal insulation criteria after electrical equipment...

Embodiment 2

[0049] Such as figure 2 As shown, the present invention discloses a device for quickly judging internal faults of electrical equipment, including a module for extracting induced voltage data, a module for establishing an induced voltage calculation model, a module for establishing internal insulation criteria after a fault in electrical equipment, an analysis and judgment module, and a module for outputting conclusions. Five program modules, the program modules run on the computer.

[0050] The module for extracting induced voltage data is used to obtain the induced voltage value of the high-voltage side of the transformer from the dispatching control system and store the obtained value in the database.

[0051] Establish an induced voltage calculation model module, which is used for the induced voltage calculation model including a transformer model, a circuit breaker fracture capacitance, a current transformer to ground capacitance, a voltage transformer to ground capacitan...

example 1

[0087] Example 1: Numerical calculation of the equivalent ground capacitance and ground resistance of the main transformer

[0088] Taking a phase of transformer #3 in Linhe Station as an example, the rated line voltage on the high voltage side of the transformer is 525kV, the corresponding phase voltage is about 300kV, the rated capacity is 250MVA, the no-load voltage loss is 74.9kW, and the no-load current percentage is 0.047. The equivalent resistance and capacitance on the high voltage side are:

[0089] Equivalent resistance:

[0090]

[0091] Equivalent capacitance:

[0092]

[0093]

[0094]

[0095]

[0096]

[0097] Resistors and capacitors are connected in parallel.

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Abstract

The invention discloses a method and device for quickly judging internal faults of electrical equipment, and relates to the technical field of power equipment monitoring; the method includes presetting the criterion voltage of each type of insulation state of electrical equipment, and obtaining the induced voltage at the high voltage side of the transformer to be determined U test, compare the induced voltage U test on the high voltage side of the transformer with the criterion voltage and determine the fault condition of the electrical equipment; the device includes an analysis and judgment module, which is used to measure and judge the measured transformer high voltage side induced voltage U test after the transformer branch circuit is tripped According to the voltage comparison and determination of the fault condition of the electrical equipment; through the above method, etc., the internal fault of the electrical equipment can be quickly judged.

Description

technical field [0001] The invention relates to the technical field of electric equipment monitoring, in particular to a method and device for quickly judging internal faults of electric equipment. Background technique [0002] Current transformers and their associated circuit breaker switches, enclosed busbar GIS leads, current transformers CT, voltage transformers PT, lightning arresters and other electrical equipment have internal faults, and the equipment can only be checked by means of test equipment or disassembly after the equipment is powered off. Specific failure conditions. [0003] Taking the transformer fault detection method as an example to introduce: if the traditional transformer fault detection method is used, the insulation resistance, leakage current and other characteristics of the transformer can be obtained, but when using the detection equipment such as megohmmeter, it may be necessary for the detection personnel to contact the transformer, and also I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/62G01R31/56G01R31/12
CPCG01R31/62G01R31/56G01R31/12
Inventor 赵春雷王鑫明孙广辉曹树江李世辉曹欣贾晓卜张飞飞刘宏亮张学伟尹燕哲
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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