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Method and device for fault detection of electric equipment

A power equipment and fault detection technology, applied in the field of power systems, can solve problems such as false alarms, temperature or temperature rise is not fixed, etc.

Active Publication Date: 2021-08-10
SIEMENS POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the temperature or temperature rise of the switchgear is not fixed under different loads, it is possible to use a unified maximum allowable heating temperature and allowable temperature rise to determine whether the contact point is faulty, and false alarms may occur

Method used

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  • Method and device for fault detection of electric equipment
  • Method and device for fault detection of electric equipment
  • Method and device for fault detection of electric equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a method for detecting a fault of a switchgear, and the execution subject is a device for detecting a fault of the switchgear. The device can be integrated in a temperature measuring sensor, a computer or a relay protection device, or can be set separately, which will not be repeated here.

[0047] Such as figure 1 As shown, is a schematic flow chart of the method for fault detection of a switchgear according to this embodiment. The method includes:

[0048] Step 101, obtain the primary current of the switch cabinet and the real-time temperature rise of a contact point of the switch cabinet, the contact point being the contact position of at least two components of the switch cabinet.

[0049]The primary current in this embodiment refers to the current at the high voltage side, and the real-time temperature rise of the contact point refers to the difference between the current temperature of the contact point and the ambient temperature. In a...

Embodiment 2

[0059] This embodiment provides a further supplementary description of the method for detecting a switchgear failure in the first embodiment.

[0060] The following describes how to determine the preset relational expression with an example. In the normal working state of the switch cabinet, the temperature rise and the corresponding primary current of the contact point in each sampling period are obtained, specifically, the temperature rise within 8-9 hours can be obtained. Then, the preset relational expression is determined according to the temperature rise of each sampling period, the primary current, and the target parameter of the contact point. The switchgear is in normal working state, which means that the switchgear itself can work normally, and the contact points are in good contact, that is, it is in a normal contact state. With the accumulation of primary current, the temperature rise at the contact point will gradually increase until finally reaching a stable val...

Embodiment 3

[0082] This embodiment provides a device for fault detection of a switchgear, which is used to implement the method for fault detection of a switchgear in Embodiment 1.

[0083] Such as image 3 Shown is a schematic structural diagram of a device for detecting a switch cabinet fault according to this embodiment. The device includes a first acquiring unit 301 , a second acquiring unit 302 and a determining unit 303 .

[0084] Wherein, the first obtaining unit 301 is used to obtain the primary current of the switch cabinet and the real-time temperature rise of a contact point of the switch cabinet, the contact point being the contact position of at least two components of the switch cabinet; the second obtaining Unit 302 is used to obtain a target parameter of a contact point according to the primary current, the real-time temperature rise and a preset relational expression, the preset relational expression being the primary current of the switchgear, the temperature of the con...

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Abstract

The present invention relates to a method and device for fault detection of electric equipment. The method includes: obtaining the primary current of the electric equipment and the real-time temperature rise of a contact point of the electric equipment, where the contact point is the contact position of at least two parts of the electric equipment; Obtain the target parameter of a contact point according to the primary current, real-time temperature rise and the preset relational expression, the preset relational expression is the corresponding relationship between the primary current of the power equipment, the temperature rise of the contact point and the target parameter; according to the obtained target parameter , to determine if the contact point has failed. By pre-obtaining the corresponding relationship between the primary current of the power equipment, the temperature rise of the contact point and the target parameter, and then obtaining the primary current of the power equipment and the temperature rise of the contact point in real time to determine the target parameter of the contact point, and then through the target parameter to determine if the contact point is faulty.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and device for fault detection of power equipment. Background technique [0002] The switchgear is an important power transmission and distribution device in the power system, so it is necessary to monitor the operation of the switchgear in real time. Switchgear usually has various contact points, such as the position where the plum blossom contact contacts the static contact, the position where the copper bar connects to external equipment, etc. When the current flows through the contact point, the contact point will heat up, so the national standard specifies the contact point The maximum allowable heating temperature and the maximum allowable temperature rise of the point. Due to factors such as manufacturing, installation, transportation or long-term operation, the contact point may have problems such as contact oxidation, deformation and looseness. When these problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 付俊华王浩官建涛赵吉生周寻
Owner SIEMENS POWER AUTOMATION