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CN1355952A - Electrical machine winding ground-fault protection system - Google Patents

Electrical machine winding ground-fault protection system Download PDF

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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
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China
Prior art keywords
winding
fault protection
motor
transformer
ground
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CN 00808738
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Chinese (zh)
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M·福尔茨克
J·博特施
M·普菲夫纳
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ABB Power Automation AG
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ABB Power Automation AG
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Publication of CN1355952A publication Critical patent/CN1355952A/en
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    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

本发明的目的在于提供一种用于电机绕组,尤其是具有通过第一电压互感器接地的中性点的发电机定子绕组的接地故障保护系统,所述系统可以在电机的操作期间应用,所述电机和变压器串联,或和发电机并联,或直接和母线相连。按照本发明的系统的特征在于由第二单相电压互感器(8)的一次绕组、被安装在电机(1)的绕组的中性点(2)的第一单相电压互感器(5)的二次绕组以及低阻值电阻(7)形成的电路。一个分流电抗器(6)和电压互感器(8)的一次绕组并联。

Figure 00808738

The object of the present invention is to provide a ground fault protection system for a motor winding, especially a generator stator winding with a neutral point grounded through a first potential transformer, which system can be applied during operation of the motor, so that The motor is connected in series with the transformer, or connected in parallel with the generator, or directly connected with the busbar. The system according to the invention is characterized in that it consists of a primary winding of a second single-phase voltage transformer (8), a first single-phase voltage transformer (5) mounted at the neutral point (2) of the winding of the motor (1) The circuit formed by the secondary winding and the low resistance resistor (7). A shunt reactor (6) is connected in parallel with the primary winding of the voltage transformer (8).

Figure 00808738

Description

电机绕组接地故障保护系统Motor Winding Ground Fault Protection System

本发明的目的是提供一种具有通过电压互感器接地的中性点的电机绕组的接地故障保护系统，特别是发电机的定子绕组，可以应用于在和变压器串联的或者和发电机并联的或者直接和母线相连的发电机操作期间进行接地故障保护。The object of the present invention is to provide a ground fault protection system for a motor winding with a neutral point grounded through a voltage transformer, in particular a stator winding of a generator, which can be applied in series with a transformer or in parallel with a generator or Earth fault protection during operation of generators directly connected to the bus.

在1995年11月出版的目录为NO.1MDB 02012-EN的ABB NetworkPartner第3页图6披露的一种已知的具有通过电压互感器接地的中性点的发电机定子绕组的接地故障保护系统包括被连接在发电机中性点和地之间的单相电压互感器。所述电压互感器的二次绕组并联有相互串联的两个电阻，其中一个具有较低的阻值，另一个电阻具有大约比第一个电阻的阻值大4倍的阻值。一个含有频率等于发电机额定频率的1/4的电压源的系统和低阻值的电阻并联。所述系统和接地故障保护单元并联。一个其二次绕组和接地故障保护单元的输入并联的单相电压互感器和具有大约比第一个电阻的阻值大4倍的电阻值的电阻并联。A known ground fault protection system for generator stator windings with a neutral point grounded through a voltage transformer disclosed in Figure 6 on page 3 of ABB NetworkPartner catalog No. 1MDB 02012-EN published in November 1995 Consists of single-phase voltage transformers connected between generator neutral and ground. The secondary winding of the voltage transformer is connected in parallel with two resistors connected in series, one of which has a lower resistance value, and the other resistor has a resistance value approximately four times greater than that of the first resistor. A system consisting of a voltage source with a frequency equal to 1/4 the rated frequency of the generator is connected in parallel with a low value resistor. The system is connected in parallel with the ground fault protection unit. A single-phase potential transformer with its secondary winding connected in parallel with the input of the ground fault protection unit is connected in parallel with a resistor having a resistance value approximately four times greater than that of the first resistor.

现有的发电机定子绕组的接地故障保护系统的缺点在于，在发电机定子绕组的任何部分出现接地故障的情况下，在接地故障点通过的接地故障电流的值主要取决于被连接在发电机中性点和地之间的单相电压互感器的二次侧上的电阻的电阻值。这些电阻总是引起接地故障电流值的增加，使得在接地故障位置的所述接地故障电流总是大大超过5安培。如果接地故障发生在发电机定子绕组，这个电流将引起定子的相当大的破坏。现有的发电机定子绕组接地故障保护系统的另一个缺点在于，超过5安培的接地故障电流的值限制了由这种接地故障保护系统保护的区域的长度。A disadvantage of existing ground fault protection systems for generator stator windings is that, in the event of a ground fault in any part of the generator stator winding, the value of the ground fault current passing at the ground fault point depends primarily on the The resistance value of the resistor on the secondary side of a single-phase voltage transformer between neutral and ground. These resistances always cause an increase in the value of the ground fault current so that said ground fault current at the ground fault location is always well above 5 amperes. If a ground fault occurs in a generator stator winding, this current will cause considerable damage to the stator. Another disadvantage of existing generator stator winding ground fault protection systems is that values of ground fault current in excess of 5 amperes limit the length of the area protected by such ground fault protection systems.

按照本发明的用于电机绕组，尤其是发电机定子绕组的接地故障保护系统包括具有接地的一次绕组的单相电压互感器，所述互感器和绕组的中性点相连，并且一个低阻值的电阻和所述互感器的二次绕组相连，所述电阻和一个频率等于电机的额定频率的1/4的一个电压源并联，并且所述电压源和接地故障保护单元耦连，所述接地故障保护单元的输入和另一个单相电压互感器的二次绕组相连，并且所述单相电压互感器的一次绕组和与发电机的中性点相连的单相电压互感器的二次绕组并联，本发明的实质在于，由第二单相电压互感器的一次绕组、被安装在绕组的中性点的单相电压互感器的二次绕组以及低阻值电阻形成的电路，一个分流电抗器和第二电压互感器的一次绕组并联。所述分流电抗器的电感在0.01到2毫亨的范围内。The ground fault protection system for motor windings, in particular generator stator windings, according to the invention comprises single-phase voltage transformers with grounded primary windings, said transformers being connected to the neutral point of the windings and having a low resistance The resistor is connected to the secondary winding of the transformer, the resistor is connected in parallel with a voltage source with a frequency equal to 1/4 of the rated frequency of the motor, and the voltage source is coupled to the ground fault protection unit, the ground The input of the fault protection unit is connected to the secondary winding of another single-phase voltage transformer, and the primary winding of the single-phase voltage transformer is connected in parallel with the secondary winding of the single-phase voltage transformer connected to the neutral point of the generator , the essence of the present invention is that the circuit formed by the primary winding of the second single-phase voltage transformer, the secondary winding of the single-phase voltage transformer installed at the neutral point of the winding, and the low resistance resistor, a shunt reactor It is connected in parallel with the primary winding of the second voltage transformer. The inductance of the shunt reactor is in the range of 0.01 to 2 millihenries.

以附图中表示的本发明的一个示例的实施例说明本发明的目的，所述附图表示发电机定子绕组的接地故障保护系统的单元图，所述发电机定子绕组和与其串联的变压器为一个单元工作。The object of the invention is illustrated by means of an exemplary embodiment of the invention represented in the accompanying drawing showing a unit diagram of an earth fault protection system for a stator winding of a generator with a transformer connected in series as A unit works.

具有中性点2的发电机1通过母线4和变压器3相连。在发电机中性点2和地之间连接有单相电压互感器5，其一次绕组接地。所述互感器的二次绕组并联有分流电抗器6，其和几百欧姆的低阻值电阻7串联。分流电抗器6和单相电压互感器8的一次绕组并联，所述单相电压互感器的二次绕组和接地故障保护单元9并联。电阻7和频率等于发电机1的额定频率的1/4的电压源并联，所述电压源是注入系统10，所述系统和接地故障保护单元9并联。A generator 1 with a neutral point 2 is connected to a transformer 3 via a bus 4 . A single-phase potential transformer 5 is connected between the neutral point 2 of the generator and the ground, and its primary winding is grounded. The secondary winding of the transformer is connected in parallel with a shunt reactor 6, which is connected in series with a low resistance resistor 7 of several hundred ohms. The shunt reactor 6 is connected in parallel with the primary winding of the single-phase voltage transformer 8 , and the secondary winding of the single-phase voltage transformer is connected in parallel with the ground fault protection unit 9 . Resistor 7 is connected in parallel with a voltage source having a frequency equal to 1/4 of the rated frequency of generator 1 , said voltage source being an injection system 10 , said system being connected in parallel with earth fault protection unit 9 .

由注入系统10注入的电压作为电机的导体相对于地的偏压，其具有和发电机的频率不同的频率。接地故障引起取决于故障性质和注入电压的电流。接地故障保护单元9监视这个电流和被注入的电压，确定是否发生了故障和故障的性质。如果需要，接地故障保护单元9操作断路器使发电机断开。The voltage injected by the injection system 10 acts as a bias voltage for the conductors of the electric machine with respect to ground, which has a frequency different from that of the generator. A ground fault induces a current that depends on the nature of the fault and the injected voltage. The ground fault protection unit 9 monitors this current and the injected voltage to determine if a fault has occurred and the nature of the fault. If required, the ground fault protection unit 9 operates the circuit breaker to disconnect the generator.

在和变压器3相连的发电机1的无故障操作条件下，通过接入单相电压互感器5的二次绕组的元件的电流和接地故障电容电流等于0，选择和单相电压互感器5的二次绕组相连的分流电抗器6的电感，使得在接地故障期间通过发电机1的定子的绕组的主绝缘的电流被限制为小于5A以下。最好所述分流电抗器6的电感的值的范围为0.01-2毫亨。借助于恰当地选择分流电抗器6的电感，对于沿着发电机1的转子绕组的整个长度的故障，保证接地故障保护单元9能够正确操作，这减少了甚至完全消除了对发电机1的定子磁路的破坏。Under the fault-free operating condition of the generator 1 connected to the transformer 3, the current and the ground fault capacitance current of the components connected to the secondary winding of the single-phase voltage transformer 5 are equal to 0, and the selection and single-phase voltage transformer 5 The inductance of the shunt reactor 6 connected to the secondary winding is such that the current through the main insulation of the winding of the stator of the generator 1 is limited to less than 5A during an earth fault. Preferably, the value of the inductance of the shunt reactor 6 is in the range of 0.01-2 millihenry. By means of a proper selection of the inductance of the shunt reactor 6, correct operation of the earth fault protection unit 9 is guaranteed for faults along the entire length of the rotor winding of the generator 1, which reduces or even completely eliminates the stator destruction of the magnetic circuit.

本发明不仅可以用于发电机的保护，而且可以应用于具有含有中性点的绕组的其它类型的电机，例如电动机或变压器的保护。The invention can be used not only for the protection of generators, but also for other types of electrical machines having windings with a neutral point, such as motors or transformers.

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.
CN 00808738 1999-06-11 2000-05-25 Electrical machine winding ground-fault protection system Pending CN1355952A (en)

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)

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CN1355952A true CN1355952A (en) 2002-06-26

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JP (1) JP2003502990A (en)
CN (1) CN1355952A (en)
AU (1) AU4532300A (en)
PL (1) PL333713A1 (en)
WO (1) WO2000077906A1 (en)

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Publication number Priority date Publication date Assignee Title
EP1890369B1 (en) * 2006-08-18 2013-10-02 ABB Research Ltd Ground fault detection
EP2596373B1 (en) * 2010-07-19 2015-01-21 ABB Technology AG Device and method for detecting a ground fault
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

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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

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AU4532300A (en) 2001-01-02
JP2003502990A (en) 2003-01-21
WO2000077906A1 (en) 2000-12-21
PL333713A1 (en) 2000-12-18
EP1188211A1 (en) 2002-03-20

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