CN103117533B - The method of motor malfunction is prevented during a kind of PT maintenance - Google Patents
The method of motor malfunction is prevented during a kind of PT maintenance Download PDFInfo
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- CN103117533B CN103117533B CN201310074746.2A CN201310074746A CN103117533B CN 103117533 B CN103117533 B CN 103117533B CN 201310074746 A CN201310074746 A CN 201310074746A CN 103117533 B CN103117533 B CN 103117533B
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Abstract
The invention provides a kind of method preventing motor malfunction when PT overhauls, it comprises high-tension motor under-voltage protection, it is characterized in that: PT breakage lock device logic has been set up in under-voltage protection: when phases line voltage arbitrary in three line voltage is lower than 42V, when other two line voltages are greater than 42 simultaneously, locking under-voltage protection; If three line voltages are simultaneously lower than 10V, protective current is greater than the rated current that 0.1Ie(Ie is motor) and be less than 1.2Ie, locking under-voltage protection.To ensure when power supply buses voltage is normal like this, because of during voltage transformer itself fail or when PT overhauls, under-voltage protection is failure to actuate, and reaches under-voltage protection false action-proof object, thus guarantees the normal operation of high-tension motor.
Description
Technical field
The invention provides a kind of method preventing the malfunction of motor low-voltage when PT overhauls, belong to electric power system relay protection control technology field.
Background technology
When the power supply buses short time voltage of high-tension motor reduces or interrupts recovering again, during for preventing motor self-staring, the serious reduction of supply voltage, configures under-voltage protection usually on high capacity motor.When power supply buses voltage drop is low to moderate certain value, time delay, by high capacity motor or the excision of secondary motor, makes power supply buses have enough voltage to ensure prior motor self-staring.High-tension motor under-voltage protection General Judging three line voltages send trip signal lower than during definite value through time delay simultaneously; defect is the reason that this protection can not distinguish voltage reduction; when power supply buses break down cause voltage to reduce time; it makes tripping operation export tripping high-tension motor; when voltage transformer breaks down; it also can trip and export tripping high-tension motor, i.e. so-called misoperation.
Summary of the invention
The object of this invention is to provide and a kind ofly can prevent the high-tension motor method of undervoltage protection of misoperation when can overcome above-mentioned defect, PT maintenance.
Prevent the method for motor malfunction during PT maintenance of the present invention, original under-voltage protection logical foundations sets up following logic: the under-voltage protection of PT breakage lock device.
Above-mentioned PT prevents the method for motor malfunction when overhauling; the logic that its PT breaks is: when phases line voltage arbitrary in three line voltage is lower than 42V; when other two line voltages are greater than 42V simultaneously, or the while of three line voltages, lower than 10V, protective current is greater than the rated current that 0.1Ie(Ie is motor) and be less than 1.2 Ie.
The present invention compared with prior art; tool has the following advantages: on the basis of original high-tension motor under-voltage protection function; set up PT breakage lock device low-voltage function; can ensure when power supply buses voltage is normal, because of during voltage transformer itself fail or when PT overhauls; under-voltage protection is failure to actuate; reach under-voltage protection false action-proof object, thus ensure the normal operation of high-tension motor.
Accompanying drawing explanation
Fig. 1 is the logic diagram of under-voltage protection of the present invention.
Embodiment
Technical scheme of the present invention is described further by specific embodiment below in conjunction with accompanying drawing.
The high-tension motor under-voltage protection of the present embodiment, is characterized in that: PT breakage lock device logic has been set up in under-voltage protection: when phases line voltage arbitrary in three line voltage is lower than 42V, when other two line voltages are greater than 42V simultaneously, and locking under-voltage protection; If three line voltages are simultaneously lower than 10V, protective current is greater than the rated current that 0.1Ie(Ie is motor) and be less than 1.2 Ie, locking under-voltage protection.During PT maintenance, although line voltage meets operation condition, protective current meets barring condition simultaneously; the under-voltage protection of PT breakage lock device, can ensure that under-voltage protection is failure to actuate when PT overhauls like this; reach under-voltage protection false action-proof object, thus guarantee the normal operation of high-tension motor.
Although the present invention is with preferred embodiment openly as above, they are not for limiting the present invention, anyly haveing the knack of this those skilled in the art, without departing from the spirit and scope of the invention, from when making various changes or retouch, but same within protection scope of the present invention.What therefore protection scope of the present invention should define with the claims of the application is as the criterion.
Claims (1)
1. prevent a method for motor malfunction during PT maintenance, comprise high-tension motor under-voltage protection, it is characterized in that, PT broken string logic is set up in under-voltage protection: the under-voltage protection of PT breakage lock device; Described PT broken string logic, specifically refers to: when phases line voltage arbitrary in three line voltage is lower than 42V, when other two line voltages are greater than 42V simultaneously, and locking under-voltage protection; If three line voltages are simultaneously lower than 10V, protective current is greater than 0.1Ie and is less than 1.2 Ie, and Ie is the rated current of motor, locking under-voltage protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310074746.2A CN103117533B (en) | 2013-03-11 | 2013-03-11 | The method of motor malfunction is prevented during a kind of PT maintenance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310074746.2A CN103117533B (en) | 2013-03-11 | 2013-03-11 | The method of motor malfunction is prevented during a kind of PT maintenance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103117533A CN103117533A (en) | 2013-05-22 |
| CN103117533B true CN103117533B (en) | 2015-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310074746.2A Active CN103117533B (en) | 2013-03-11 | 2013-03-11 | The method of motor malfunction is prevented during a kind of PT maintenance |
Country Status (1)
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| CN (1) | CN103117533B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297625A (en) * | 2014-11-07 | 2015-01-21 | 安徽马钢自动化信息技术有限公司 | PT wire breakage diagnosis system and method |
| CN106207973B (en) * | 2016-08-24 | 2018-10-23 | 北京德威特电气科技股份有限公司 | Motor protection method and apparatus |
| CN109066604B (en) * | 2018-09-27 | 2020-04-14 | 岭澳核电有限公司 | Generator low-voltage protection system of million-kilowatt nuclear power station |
| CN112751316B (en) * | 2020-12-31 | 2023-05-05 | 广东电网有限责任公司 | Configuration method and device for power failure of bus voltage transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6020702A (en) * | 1998-01-12 | 2000-02-01 | Tecumseh Products Company | Single phase compressor thermostat with start relay and motor protection |
| CN2437069Y (en) * | 2000-07-28 | 2001-06-27 | 肖金星 | Low-voltage protector with wrong action resistance for high-voltage motor |
| CN102694369A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for preventing low-voltage protection misoperation of motor caused by PT disconnection |
-
2013
- 2013-03-11 CN CN201310074746.2A patent/CN103117533B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6020702A (en) * | 1998-01-12 | 2000-02-01 | Tecumseh Products Company | Single phase compressor thermostat with start relay and motor protection |
| CN2437069Y (en) * | 2000-07-28 | 2001-06-27 | 肖金星 | Low-voltage protector with wrong action resistance for high-voltage motor |
| CN102694369A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for preventing low-voltage protection misoperation of motor caused by PT disconnection |
Non-Patent Citations (1)
| Title |
|---|
| 朱法强,邹言云.关于PT断线误动的事故分析.《江西电力职业技术学院学报》.2010,第23卷(第2期),正文第2栏第14-22行. * |
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| CN103117533A (en) | 2013-05-22 |
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