KR200322462Y1 - Apparatus of Preventing Over-voltage of the Excitation System in the Power Generator - Google Patents

Abstract

The present invention relates to an overvoltage protection device of a generator field that protects a field directly by using a field circuit breaker in a generator and simultaneously monitors overvoltage using a power device and protects it when an overvoltage occurs. And overvoltage monitoring circuits to monitor the overvoltage and discharge the overvoltage using a power device when the overvoltage occurs, thereby simplifying the circuit and affecting the two fields. Considering that two factors can be protected by only one power device at the same time, it can be designed and manufactured to improve the system in terms of reliability and economics.

Description

Apparatus of Preventing Over-voltage of the Excitation System in the Power Generator}

The present invention relates to an overvoltage protection device of a generator field, and more particularly, to an overvoltage protection device of a generator field that protects a field directly by using a field circuit breaker in a generator and simultaneously monitors overvoltage using a power device and protects it when an overvoltage occurs. It is about.

In general, the basic role of a generator field is to generate a magnetic field with a size and shape that can be coupled to the stator and armature windings to induce an output voltage. The principle of voltage induction in the armature winding is that the field By rotating according to the principle of Faraday's law, a voltage is induced in the armature winding.

The field is a large rotating electromagnet with polar polarities in the south and north poles, and the magnetic flux radiating from the field forms a magnetic closed circuit that returns through the voids, stator cores and back to the voids. In addition, the MMF (Magnetic Motive Force) of the field requires the shape of the sine wave in order for electricity to induce the sine wave voltage in the winding, the size and shape of the field depends on the position and spacing of the field winding and the magnitude of the field current To be controlled.

On the other hand, as a general method for preventing overvoltage induced in the generator field, there is a direct protection method using the contact of the field circuit breaker and for the overvoltage detection using the power device.

Recently, the overvoltage protection method of the field using the power device occupies the majority, but when the circuit is implemented using the auxiliary contact of the field circuit breaker, a separate line such as a bus bar must be connected. .

By the way, in the prior art, since the overvoltage protection device of the generator field is largely divided into the direct protection method by the auxiliary contact of the field circuit breaker and the method using the power element detected after monitoring the voltage, as described above, It is considered that the ripple effect due to non-operation of the installed facilities is increased according to the purpose and should be emphasized in terms of reliability.

In order to solve the necessity as described above, the present invention provides an overvoltage protection device of the generator field to protect the field directly by using a field circuit breaker in the generator and at the same time to monitor the overvoltage by using a power element and to protect against the occurrence of overvoltage To provide, the purpose is.

In addition, the present invention protects the field directly by using a field circuit breaker in the generator, and at the same time to monitor the overvoltage using a power device and to protect against overvoltage, there is no need for a separate line connection when using a conventional field breaker, overvoltage protection The use of the circuits simultaneously seeks to simplify the circuits.

In addition, the present invention protects the field directly by using a field circuit breaker in the generator and simultaneously monitors the overvoltage using a power device and protects it when an overvoltage occurs, thereby simultaneously causing two factors for the cause factors affecting the two fields. The purpose of the present invention is to provide an improved system implementation in terms of reliability and economy by enabling protection of only one power device.

1 is a schematic view showing the configuration of an overvoltage protection device of a generator field according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a circuit for preventing overvoltage in FIG. 1. FIG.

FIG. 3 is a layout diagram illustrating a detection board in FIG. 1. FIG.

Explanation of symbols on the main parts of the drawings

10: field breaker 20: generator field

30: detection board 31: power device

32: field breaker contact input

40: generator

50: controller

The overvoltage protection device of the generator field according to the embodiment of the present invention for achieving the above object is to protect the field directly by using a field circuit breaker in the generator, and to monitor the overvoltage, using a power device when the overvoltage occurs And an overvoltage prevention circuit for discharging the overvoltage.

Preferably, the over-voltage prevention circuit includes a detection board for generating an over-voltage generation notification signal upon generation of an over-voltage of a generator and turning on the power device to discharge the over-voltage; A controller configured to generate an on / off control signal by receiving an overvoltage occurrence notification signal of the detection board; And a field breaker for turning on / off power applied to the field according to the on / off control signal of the controller.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention for achieving the object as described above in detail as follows.

The overvoltage protection device of the generator field according to the embodiment of the present invention, as shown in Figure 1, the field breaker 10, the generator field 20, the detection board 30, the generator 40, the controller 50, which is configured to implement a circuit for preventing overvoltage in order to prevent overvoltage generation of the generator 40 from being induced.

The circuit for preventing overvoltage inserts the field breaker 10 in front of the generator field 20 in the case of a field breaker to directly protect the generator field 20 by on / off driving and monitors the occurrence of overvoltage. Then, in the event of an overvoltage, protection is performed using only the power element 31 as shown in FIG.

For this purpose, the input uses a contact point 32 of the field circuit breaker 10 and a direct current (DC) voltage sensor (not shown in the drawing for convenience of description) in the detection board 30. When the situation occurs, the power element 31 is automatically turned on to be discharged so that the generator field 10 can be stably protected even if any one of the two operation causes factors occurs first. Is done.

In other words, the overvoltage protection circuit includes a field circuit breaker 10, a detection board 30, and a controller 50.

The field circuit breaker 10 is provided at the front end of the generator field 20, the power is applied to the generator field 20 in accordance with the on / off control signal applied from the controller 50 to turn on / off The generator field 20 is protected.

The detection board 30 is provided with a DC voltage sensor to detect that overvoltage generation of the generator 40 is induced, that is, when the overvoltage occurs in the generator 40, the generated overvoltage is a reference voltage (about). , 2400V) or more, and when the generated overvoltage is equal to or greater than the reference voltage, an overvoltage generation notification signal is generated and notified to the controller 50, and the power device 31 is turned on to generate the overvoltage. To be discharged.

The controller 50 receives an overvoltage generation notification signal from the detection board 30 and applies an on / off control signal to the field breaker 10 to protect the generator field 20. ) Control on / off.

As described above, by using the present invention to protect the field directly by using a field circuit breaker in the generator, and to monitor the overvoltage using a power device and to protect against the occurrence of overvoltage, the circuit implementation using the auxiliary contact of the field circuit breaker in the prior art In this case, it is possible to overcome the disadvantage that a separate line such as a bus bar must be connected, and the circuit can be simplified by simultaneously using an overvoltage protection circuit.

In addition, the present invention can be designed and manufactured to improve the system in terms of reliability and economics in consideration of the two factors to be protected by only one power element at the same time for the cause factors affecting the two fields.

Claims (2)

An overvoltage protection device for a generator field, comprising an overvoltage protection circuit that directly protects a field using a field circuit breaker in a generator and monitors overvoltage, and discharges the overvoltage using a power device when an overvoltage occurs. The method of claim 1, The overvoltage prevention circuit, A detection board which generates an overvoltage generation notification signal when the generator generates an overvoltage, and turns on the power device to discharge the overvoltage; A controller configured to generate an on / off control signal by receiving an overvoltage occurrence notification signal of the detection board; And a field circuit breaker for turning on / off power applied to the field according to the on / off control signal of the controller.