CN1355952A - Electrical machine winding ground-fault protection system - Google Patents
Electrical machine winding ground-fault protection system Download PDFInfo
- Publication number
- CN1355952A CN1355952A CN 00808738 CN00808738A CN1355952A CN 1355952 A CN1355952 A CN 1355952A CN 00808738 CN00808738 CN 00808738 CN 00808738 A CN00808738 A CN 00808738A CN 1355952 A CN1355952 A CN 1355952A
- Authority
- CN
- China
- Prior art keywords
- winding
- fault protection
- transformer
- resistance
- phase potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
Abstract
The object of the invention is a ground fault protection system of a winding of an electrical machine, especially a generator stator winding with the neutral point earthed through a first voltage transformer, applicable during the operation of the machine connected in series with a transformer or connected in parallel with a generator, or directly connected to busbars. The system according to the invention is characterised in that in the circuit formed by the primary winding of a second voltage transformer (8), the secondary winding of the first single-phase voltage transformer (5) installed in the neutral point (2) of the winding of the machine (1) and a low-resistance resistor (7). A shunt reactor (6) is connected in parallel to the primary winding of the voltage transformer (8).
Description
The purpose of this invention is to provide a kind of ground-fault protection system with motor windings of the neutral point by voltage transformer ground connection; the stator winding of generator particularly, can be applied to the transformer series connection or and the generator parallel connection or directly and bus generator coupled operating period carry out earth fault protection.
The catalogue of publishing in November nineteen ninety-five is that the 3rd page of Fig. 6 of ABB NetworkPartner of NO.1MDB 02012-EN discloses, and a kind of known ground-fault protection system with generator unit stator winding of the neutral point by voltage transformer ground connection comprises the single-phase potential transformer that is connected between generator neutral point and the ground.The secondary winding of described voltage transformer is parallel with two resistance of mutual series connection, and one of them has lower resistance, and another resistance has the big 4 times resistance of about resistance than first resistance.One contains frequency and equals the system of 1/4 voltage source of generator rated frequency and the resistance parallel connection of low resistance.Described system and the parallel connection of earth fault protection unit.The single-phase potential transformer of the input parallel connection of its secondary winding and earth fault protection unit and resistance parallel connection with the big 4 times resistance value of about resistance than first resistance.
The shortcoming of the ground-fault protection system of existing generator unit stator winding is; any part at the generator unit stator winding occurs depending primarily on the resistance value of the resistance on the secondary side that is connected the single-phase potential transformer between generator neutral point and the ground in the value of the earth fault current that earth fault is passed through under the situation of earth fault.These resistance always cause the increase of earth fault current value, make that the described earth fault current in the earth fault position always substantially exceeds 5 amperes.If earth fault occurs in the generator unit stator winding, this electric current will cause sizable destruction of stator.Another shortcoming of existing generator unit stator winding earth fault protection system is that the value that surpasses 5 amperes earth fault current has limited the length in the zone of being protected by this ground-fault protection system.
According to the motor windings that is used for of the present invention; especially the ground-fault protection system of generator unit stator winding comprises the single-phase potential transformer of a winding with ground connection; the neutral point of described instrument transformer and winding links to each other; and the resistance of a low resistance links to each other with the secondary winding of described instrument transformer; described resistance and frequency equal a voltage source parallel connection of 1/4 of the rated frequency of motor; and described voltage source and earth fault protection unit are coupled; the input of described earth fault protection unit and the secondary winding of another single-phase potential transformer link to each other; and the winding of described single-phase potential transformer and the secondary winding parallel connection of the single-phase potential transformer that links to each other with the neutral point of generator; essence of the present invention is; a winding by second single-phase potential transformer; be installed in the secondary winding of single-phase potential transformer of neutral point of winding and the circuit that low resistance resistance forms, a winding parallel connection of the divert shunt reactor and second voltage transformer.The inductance of described divert shunt reactor is in the scope of 0.01 to 2 milihenry.
Embodiment with the example of the present invention represented in the accompanying drawing illustrates purpose of the present invention; described accompanying drawing is represented the unit figure of the ground-fault protection system of generator unit stator winding, and the transformer of described generator unit stator winding and series connection with it is a cell operation.
The voltage that is injected by injected system 10 is as the conductor of the motor bias voltage with respect to ground, and it has the frequency different with the frequency of generator.Earth fault causes the electric current that depends on nature of trouble and injecting voltage.Earth fault protection unit 9 monitors this electric current and the voltage that is injected into, and has determined whether to take place the character of fault and fault.If desired, earth fault protection unit 9 operating breakers disconnect generator.
With the failure-free operation condition of transformer 3 generator coupled 1 under, the electric current and the earth fault capacitance current of the element of the secondary winding by inserting single-phase potential transformer 5 equal 0, select the inductance of the divert shunt reactor 6 link to each other with the secondary winding of single-phase potential transformer 5, make below the electric current of the main insulation of the winding of the stator by generator 1 during the earth fault is restricted to less than 5A.The scope of the value of the inductance of best described divert shunt reactor 6 is the 0.01-2 milihenry.By means of the inductance of selecting divert shunt reactor 6 rightly, for fault, guarantee that earth fault protection unit 9 can proper operation along the whole length of the rotor winding of generator 1, this has reduced even has eliminated destruction to the stator magnetic circuit of generator 1 fully.
The present invention not only can be used for the protection of generator, and can be applied to have the motor of other type of the winding that contains neutral point, for example protection of motor or transformer.
Claims (3)
1. ground-fault protection system that is used for motor windings; it comprises first single-phase potential transformer that links to each other with neutral point winding ground connection; its secondary winding links to each other with the resistance of a low resistance; described resistance and frequency equal a voltage source parallel connection of 1/4 of the rated frequency of motor; and described voltage source and earth fault protection unit are coupled; the input of described earth fault protection unit links to each other with the secondary winding of second single-phase potential transformer; and the winding of described second single-phase potential transformer and the secondary winding parallel connection of first single-phase potential transformer that links to each other with the neutral point of winding; it is characterized in that; a winding by second single-phase potential transformer (8); be installed in the secondary winding of first single-phase potential transformer (5) of neutral point (2) of winding of motor (1) and the circuit that low resistance resistance (7) forms, a winding parallel connection of a divert shunt reactor (6) and voltage transformer (8).
2. the ground-fault protection system of motor windings as claimed in claim 1 is characterized in that, the inductance of described divert shunt reactor (6) is in the scope of 0.01 to 2 milihenry.
3. the ground-fault protection system of motor windings as claimed in claim 1 is characterized in that, described motor is a generator, motor or transformer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL33371399A PL333713A1 (en) | 1999-06-11 | 1999-06-11 | Earth-fault protection circuit for a generator stator winding |
| PLP333713 | 1999-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1355952A true CN1355952A (en) | 2002-06-26 |
Family
ID=20074562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00808738 Pending CN1355952A (en) | 1999-06-11 | 2000-05-25 | Electrical machine winding ground-fault protection system |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1188211A1 (en) |
| JP (1) | JP2003502990A (en) |
| CN (1) | CN1355952A (en) |
| AU (1) | AU4532300A (en) |
| PL (1) | PL333713A1 (en) |
| WO (1) | WO2000077906A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1890369B1 (en) * | 2006-08-18 | 2013-10-02 | ABB Research Ltd | Ground fault detection |
| RU2542494C2 (en) * | 2010-07-19 | 2015-02-20 | Абб Текнолоджи Аг | Device and method for detection of ground short-circuit |
| CN104111371A (en) * | 2014-07-22 | 2014-10-22 | 中国神华能源股份有限公司 | Generator vertical zero sequence voltage acquiring method and vertical zero sequence inter-turn protection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4329382A1 (en) * | 1993-09-01 | 1995-03-02 | Abb Management Ag | Method and device for detecting earth faults on the conductors of an electrical machine |
-
1999
- 1999-06-11 PL PL33371399A patent/PL333713A1/en not_active IP Right Cessation
-
2000
- 2000-05-25 CN CN 00808738 patent/CN1355952A/en active Pending
- 2000-05-25 AU AU45323/00A patent/AU4532300A/en not_active Abandoned
- 2000-05-25 WO PCT/CH2000/000298 patent/WO2000077906A1/en not_active Application Discontinuation
- 2000-05-25 JP JP2001504056A patent/JP2003502990A/en active Pending
- 2000-05-25 EP EP00926625A patent/EP1188211A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| PL333713A1 (en) | 2000-12-18 |
| AU4532300A (en) | 2001-01-02 |
| EP1188211A1 (en) | 2002-03-20 |
| WO2000077906A1 (en) | 2000-12-21 |
| JP2003502990A (en) | 2003-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |