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A self-learning differential protection maloperation device for transformers in traction substations

A traction substation, differential protection technology, applied in emergency protection circuit devices, electrical components, petroleum industry and other directions, can solve the problem of difficult to ensure that the phase angles are completely equal, unable to achieve the purpose of operation, misoperation, etc. Low cost to manufacture, fewer errors, ease of use

Active Publication Date: 2017-10-10
SHANDONG SHANDA CENTURY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic principle of phase selection closing is to select the appropriate voltage phase angle for closing according to the information of the last opening. However, due to the discreteness of the controller accuracy and the action time of the operating mechanism, it is difficult to ensure that the actual closing phase angle of the switch is the same as that of the switch. The theoretically calculated phase angles are completely equal, and the error directly determines the suppression effect of the excitation inrush current
[0005] At present, when operating the differential protection maloperation device, misoperation is easy to occur, and sometimes the operation purpose cannot be achieved, and even the opposite effect is caused in serious cases, and serious accidents occur

Method used

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  • A self-learning differential protection maloperation device for transformers in traction substations
  • A self-learning differential protection maloperation device for transformers in traction substations
  • A self-learning differential protection maloperation device for transformers in traction substations

Examples

Experimental program
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Effect test

Embodiment 1

[0020]A lubricating paste, in parts by weight, consists of the following components: 3 parts of aluminum hydroxide, 2 parts of magnesium oxide, 15 parts of white oil, 5 parts of melamine, 4 parts of ethylene glycol ethyl ether acetate, 3 parts of pentaerythritol stearate 8 parts of lanolin, 10 parts of ethylene glycol, 5 parts of ultra-high molecular weight polyethylene fiber, 15 parts of silicone oil and 20 parts of modified polyoxymethylene powder;

[0021] The modified polyoxymethylene powder is obtained according to the following method: in parts by weight, 100 parts of polyoxymethylene, 0.05 parts of 2,6-di-tert-butyl-4-methylphenol, 0.5 parts of carbamoyl urea, and 0.5 parts of calcium carbonate 5 parts, 5 parts of graphite and 5 parts of molybdenum disulfide are mixed in a high-speed mixer, and then melted and mixed with a vented twin-screw extruder at a screw speed of 100 rpm and a barrel temperature of 190 ° C, extruded and granulated After that, it was pulverized wit...

Embodiment 2

[0023] A lubricating paste, in parts by weight, consists of the following components: 6 parts of aluminum hydroxide, 5 parts of magnesium oxide, 25 parts of white oil, 8 parts of melamine, 8 parts of ethylene glycol ether acetate, 6 parts of pentaerythritol stearate 12 parts of lanolin, 15 parts of ethylene glycol, 8 parts of ultra-high molecular weight polyethylene fiber, 20 parts of silicone oil and 25 parts of modified polyoxymethylene powder;

[0024] The modified polyoxymethylene powder is obtained according to the following method: in parts by weight, 100 parts of polyoxymethylene, 0.08 parts of 2,6-di-tert-butyl-4-methylphenol, 1 part of carbamoyl urea, and 0.8 parts of calcium carbonate 10 parts, 10 parts of graphite and 15 parts of molybdenum disulfide are mixed in a high-speed mixer, and then melted and mixed with a vented twin-screw extruder at a screw speed of 150 rpm and a barrel temperature of 230 ° C, extruded and granulated After that, it was pulverized with a ...

Embodiment 3

[0026] A lubricating paste, in parts by weight, consists of the following components: 4 parts of aluminum hydroxide, 4 parts of magnesium oxide, 20 parts of white oil, 6 parts of melamine, 6 parts of ethylene glycol ethyl ether acetate, 5 parts of pentaerythritol stearate 9 parts of lanolin, 13 parts of ethylene glycol, 7 parts of ultra-high molecular weight polyethylene fiber, 18 parts of silicone oil and 22 parts of modified polyoxymethylene powder;

[0027] The modified polyoxymethylene powder is obtained according to the following method: in parts by weight, 100 parts of polyoxymethylene, 0.07 parts of 2,6-di-tert-butyl-4-methylphenol, 0.6 parts of carbamoyl urea, and 0.7 parts of calcium carbonate Parts, 8 parts of graphite and 12 parts of molybdenum disulfide are mixed in a high-speed mixer, and then melted and mixed with a vented twin-screw extruder at a screw speed of 120 rpm and a barrel temperature of 210 ° C, extruded and granulated After that, it was pulverized wit...

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Abstract

A self-learning differential protection misoperation device for transformers in traction substations, including a main engine, an operating panel is arranged on the front side of the main engine, a shield is arranged on the front of the operating panel, and guide seats are arranged on both sides of the shield. The inner side of the guide seat is provided with a guide groove matching the side of the shield. The guide seat is fixedly installed on the shell of the main engine. Both sides of the guide seat are provided with a lubricating paste box and an elastic bag. The outlet of the lubricating paste box is connected to one end of the elastic bag. The other end of the bladder is connected to the guide groove on the guide seat through a connecting tube. Both ends of the elastic bladder are equipped with a one-way valve. The upper part of the elastic bladder is equipped with a fixing plate. The seat is parallel to the pull rod, the lower end of the pull rod is provided with a pressure plate, the pull rod passes through the fixed plate, the horizontal plate of the baffle is matched with a screw rod, the upper end of the screw rod is connected to the motor, and the start button is set on the baffle, and the start button controls the start and turn of the motor. The motor, lubricating paste box and fixing plate are all installed on the shell of the main engine.

Description

technical field [0001] The invention belongs to the field of electric equipment, in particular to a self-learning differential protection maloperation device used on a transformer of a traction substation. Background technique [0002] When the transformer is switched on without load, due to the saturation of the transformer iron core flux, the existence of residual magnetic flux and the nonlinear characteristics of the iron core material, an excitation inrush current with a relatively large amplitude will be generated, and it will reach a steady state after several cycles of transient process. , this impulsive closing current can often reach 6-8 times the rated current. In addition, the excitation inrush current will cause voltage fluctuations in this area, resulting in changes in the excitation current of transformers running in parallel with it, that is, the generation of inrush currents. This may cause misoperation of transformer differential protection, transformer ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045C10M169/04C10N30/06C10N30/12C10N50/10C10N40/14
Inventor 崔玉新谢士雷张荣泽王建徐富祥王月兰
Owner SHANDONG SHANDA CENTURY TECH
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