KR20160021653A - Protection relay - Google Patents

Abstract

The present invention relates to a protection relay and, more specifically, to a protection relay to solve the limit of conventional technology, which resets a preset relay group, that is an observation scope observing a power distribution system, in accordance with a line and a load fluctuation of the power distribution system and observes the power distribution system in accordance with the reset relay group, thereby enabling a flexible inspection depending on a change in the power distribution system, preventing misdetection and malfunction of the relay since the change in the power distribution system is not reflected thereon, and protecting the power distribution system more stably.

Description

Protection Relay {PROTECTION RELAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection relay, and more particularly, to a protection relay included in a power distribution system in which power is distributed to a line and a load, and monitors and protects a distribution system in accordance with a line and a load variation of the power distribution system.

1 is a conceptual diagram showing the operation of a protection relay included in a conventional switchboard.

The protection relay included in the conventional switchboard as shown in FIG. 1 activates the relay element to protect the lines L1 and L2 (1). If the system line is blocked due to a temporary or permanent fault in the system line of the switchboard [1] or the protective relay, the protective relay sends a circuit breaker CLOSE command signal to change the state of the TIE VCB (3). After the grid line of the switchboard [1] is disconnected, the switchboard [2] shall reset the operating conditions of the relay elements of the protective relay in order to further protect the lines L1, L2 (2). The user must manually reset the operating conditions of the relay elements according to the increase of the load, so that the lines L1 and L2 can be protected (3). It is also possible to control the protection relay through remote control of the upper supervisor (4).

Digital protection relays must be reliably protected in various environments of the power system. In case of failure of the actual grid line, if the line is to be protected through the protection relay of the other grid line, the relay element should be reset according to the increase of the underload amount. If automatic relay elements can not be reset in this situation, if the user does not reset the relay element directly and immediate action is not taken, it will make it difficult to protect the stable power system due to additional accidents.

Therefore, in order to overcome the limitations of the prior art, the present specification discloses a method of resetting a predetermined relay group, which is a monitoring range for monitoring the power distribution system, according to the line and load fluctuation of the power distribution system and monitoring the power distribution system according to the reset relay group Protection relays.

The protection relay included in the power distribution system disclosed in this specification for solving the above problems includes a detection unit for monitoring the power distribution system according to a predetermined relay group to detect the relaying element and a control unit for comparing the detected relaying element with a preset reference value And a control unit for controlling the operation of the protection device protecting the power distribution system according to the comparison result, and resetting the predetermined relaying group and the predetermined reference value according to the variation of the power distribution system.

In one embodiment, the power distribution system may be associated with another adjacent power distribution system.

In one embodiment, the predefined relay group may be a group for the monitored range to be monitored by the protection relay.

In one embodiment, the predetermined relay group may be a group for at least one load that is powered from the distribution grid.

In one embodiment, the relay element is an element for operating the protective device, and the predetermined reference value may be an operation standard of the protective device for the relay element.

In one embodiment, the control unit controls the protective device to operate when the detected relaying element exceeds the preset reference value, and when the detected relaying element is less than the preset reference value, Can not be operated.

In one embodiment, the control unit may generate a control signal for controlling the operation of the protection device according to the comparison result, and may transmit the control signal to the protection device to control the operation of the protection device.

In one embodiment, the control unit communicates with the monitoring device for monitoring the protective device and the power distribution system, and receives information on whether the power distribution system changes from at least one of the protection device and the monitoring panel have.

In one embodiment, the control unit may reset the predetermined relay group and the preset reference based on information on whether the received distribution system changes.

In one embodiment, the control unit resets the predetermined relay group according to a variation of a load supplied with electric power from the distribution system, and when the load is added to the distribution system, To reset the predetermined relaying group, and to reset the predetermined relaying group by excluding the load from the predetermined relaying group when the load is excluded from the distribution system.

In one embodiment, the control unit may reset the predetermined reference value according to the load capacity of the resetting relay group.

In one embodiment, the control unit resets the preset reference value upward when the reset relay group is added and reset, and when the reset relay group is reset due to the load being excluded, The set reference value can be reset downward.

In one embodiment, the power distribution system can be re-monitored in accordance with the reset relay group and the reset reference value.

The protective relay disclosed in this specification has an effect of monitoring the distribution system according to the resetted relay group by resetting the predetermined relay group which is the monitoring range for monitoring the power distribution system according to the line and load variation of the power distribution system.

The protective relay disclosed in this specification has an effect that flexible monitoring can be performed according to the variation of the power distribution system by monitoring the power distribution system according to the power distribution group line and the power supply group reset in accordance with the load variation.

The protection relay disclosed in this specification monitors a distribution system according to a distribution group and a relay group that is reset in accordance with a load variation to thereby prevent erroneous detection and malfunction of the relay due to no change in the distribution system It is effective.

The protection relay disclosed in this specification has an effect of preventing an accident from spreading and preventing an abnormal generation of an additional system by monitoring the distribution system according to a distribution group and a relay group that is reset according to a load variation.

The protective relay disclosed in this specification monitors the power distribution system according to the power distribution group and the relay group reset according to the load fluctuation to prevent the accident from spreading and prevents the occurrence of abnormality of the additional system so that the power distribution system can be more stably protected There is an effect to be.

1 is a conceptual view showing the operation of a protection relay included in a conventional switchboard;
2 is a block diagram showing a configuration of a protection relay disclosed in this specification;
3 is a block diagram showing a configuration according to an embodiment of the protection relay disclosed in this specification;
4 is an exemplary view showing an application example according to an embodiment of the protection relay disclosed in this specification;
5 is a flow diagram illustrating an operational sequence according to an embodiment of the protective relay disclosed herein;

The techniques disclosed herein can be applied to protective relays. However, the technology disclosed in this specification is not limited thereto, and may be applied to all relays, breakers, controllers, switches, power protection devices, earth leakage breakers, switchgear, power distribution boards, distribution systems, distribution boards, System protection systems, system control systems, facility protection devices, facility control devices, and other protection relay systems.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Also, the technical terms used herein should be interpreted as being generally understood by those skilled in the art to which the presently disclosed subject matter belongs, unless the context clearly dictates otherwise in this specification, Should not be construed in a broader sense, or interpreted in an oversimplified sense. In addition, when a technical term used in this specification is an erroneous technical term that does not accurately express the concept of the technology disclosed in this specification, it should be understood that technical terms which can be understood by a person skilled in the art are replaced. Also, the general terms used in the present specification should be interpreted in accordance with the predefined or prior context, and should not be construed as being excessively reduced in meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising ", etc. should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted.

Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured. In addition, it should be noted that the attached drawings are only for easy understanding of the concept of the technology disclosed in the present specification, and should not be construed as limiting the idea of the technology by the attached drawings.

Hereinafter, the protection relays disclosed herein will be described with reference to FIGS. 2 and 3. FIG.

2 is a block diagram showing the configuration of the protection relay disclosed in this specification.

3 is a block diagram showing a configuration according to an embodiment of the protection relay disclosed in this specification.

The protection relay 50 disclosed in this specification includes a detection unit 10 and a control unit 20, as shown in Fig.

The protection relay 50 may be included in the power distribution system to monitor and protect the power distribution system.

The protective relay (50) is installed in the line of the power distribution system, and can detect an accident of the power distribution system.

The protection relay 50 may be either an electronic relay or a digital relay.

The protection relay 50 may monitor and protect the distribution system through the detection unit 10 and the control unit 20. [

The protection relay 50 including the detection unit 10 and the control unit 20 is included in the power distribution system 100 as shown in FIG.

The power distribution system 100 may mean a system in which the power supplied from the system is distributed.

The power distribution system 100 may be a system in which power transmitted from the system is distributed to be supplied to the lower transmission system or load.

The power distribution system 100 may include at least one load 200 to which power is supplied.

The power distribution system 100 may include at least one water distribution device.

For example, at least one of a breaker, a disconnector, a switch, a lightning arrester, a detector, a meter, a controller, a surge absorber, a communicator, a transformer, an electric switchboard,

The power distribution system 100 can be monitored and protected through the protection relay 50.

The power distribution system 100 may be associated with another adjacent power distribution system.

That is, one or more power distribution systems may be associated so that power can be distributed through the associated power distribution system.

The detection unit 10 monitors the power distribution system 100 according to a predetermined relay group to detect a relay element.

The detection unit 10 may be a part performing the detection function of the protection relay 50. [

The detecting section 10 can detect any one or more of a current and a voltage flowing in the line of the power distribution system 100. [

The detecting unit 10 may include a detector capable of detecting at least one of a current and a voltage flowing in a line of the power distribution system 100.

For example, it may include any one of a CT (Current Transformer) for detecting a current and a Potential Transformer (PT) for detecting a voltage.

The detecting unit 10 may detect any one or more of the current and voltage flowing in the line of the power distribution system 100 according to the predetermined relay group to detect the relaying element.

The predetermined relay group may be a group for a monitoring target range to be monitored by the protection relay 50.

That is, the preset relay group may be a group for a range in which the protection relay 50 monitors the power distribution system 100.

The predetermined relay group may be a group for the at least one load (200) that is powered from the power distribution system (100).

That is, the predetermined relay group may be grouped in units of the at least one load (200).

The predetermined relay group may be set in the control unit 20. [

The relay element may mean an element to be detected by the protection relay 50.

The relaying element may be a detecting element for the current and voltage flowing in the line of the power distribution system 100.

The control unit 20 compares the detected relaying element with a predetermined reference value to control the operation of the protection device 60 protecting the power distribution system 100 according to the comparison result, The predetermined relay group and the preset reference value are reset in accordance with the variation of the predetermined relay group.

The control unit 20 may be a part for performing determination and operation control on the calculation, data processing, and control of the protection relay 50.

The control unit 20 can control the overall operation of the protection relay 50. [

The control unit 20 can control the overall operation of the protection relay 50 according to the result detected by the detection unit 10.

The control unit 20 can control the operation of the protection device 60 by the overall operation of the protection relay 50. [

The control unit 20 compares the relay element with respect to the current and voltage detected by the detection unit 10 with the preset reference value and controls the operation of the protection device 60 according to the comparison result, (100) can be protected.

That is, the relay element may be an element for operating the protection device 60.

The predetermined reference value may be an operation criterion of the protection device 60 for the relay element.

For example, it may be a rated voltage, a rated current, a rated breaking current, a maximum current, a minimum current, etc. of the power distribution system 100.

The predetermined reference value may be set in the controller 20.

The control unit (20) controls the protection device (60) to operate when the detected relaying element exceeds the preset reference value, and when the detected relaying element is less than the preset reference value, So that the device 60 can be controlled not to operate.

For example, when the detected relaying element is a current of 20 [A] and the preset reference value is a current of 10 [A], the detected relaying element exceeds the preset reference value, 20 may be controlled to operate the protective device 60 and if the detected relaying element is a voltage of 19.8 KV and the predetermined reference value is a voltage of 22.9 KV, The control unit 20 may control the protection device 60 so that the protection device 60 does not operate.

The control unit 20 generates a control signal for controlling the operation of the protection device 60 according to the comparison result and transmits the control signal to the protection device 60, The operation can be controlled.

The control unit 20 controls the operation of the protection device 60 that protects the power distribution system 100 by comparing predetermined reference values according to the relay elements detected in accordance with the predetermined relay group and the predetermined relay group The predetermined relay group and the preset reference value can be reset according to the variation of the power distribution system 100. [

That is, when there is a change in the power distribution system 100, the control unit 20 resets the predetermined relay group and the predetermined reference value set based on the pre-change status of the power distribution system 100, It is possible to monitor and protect the system 100 by reflecting the fluctuation of the system 100.

The control unit 20 communicates with the protection unit 60 and the monitoring unit 70 that monitors the power distribution system 100 to detect at least one of the protection device 60 and the monitoring panel 70 Information on whether the power distribution system 100 is changed or not can be received.

The monitoring unit 70 may refer to a monitoring apparatus or a monitoring system for monitoring an upper system including the power distribution system 100. [

The monitoring unit 70 can detect whether the power distribution system 100 has changed or not and transmit information about the power distribution system 100 to the protection relay 50. [

For example, when a load is added to the power distribution system 100 or an existing load is excluded, the monitoring unit 70 detects the load and transmits the variation information to the protection relay 50 .

 The protective device 60 can also detect whether the power distribution system 100 is fluctuating and transmit information about the power distribution system 100 to the protection relay 50. [

For example, when the protection device 60 is a switch that connects the power distribution system 100 with the adjacent other power distribution system, the protection system 60 may be connected to the power distribution system 100 and the adjacent other power distribution system 100. [ The protection device 60 can recognize the load and transmit the variation information to the protection relay 50. The protective relay 60 can detect the load of the protection relay 50,

The control unit 20 may reset the predetermined relay group and the predetermined reference value based on the information on whether the received distribution system 100 is changed or not.

That is, the control unit 20 determines whether the received distribution system 100 is changed or not based on whether the received distribution system 100 is changed or not based on the predetermined relay group and the preset reference value, The predetermined relay group and the preset reference value may be reset.

The control unit 20 resets the predetermined relay group in accordance with the variation of the load 200 supplied with power from the distribution system 100 and adds the load 200 to the distribution system 100 , The load (200) is added to the predetermined relay group to reset the predetermined relay group, and when the load (200) is excluded from the distribution grid (100), the load It is possible to reset the predetermined relay group by excluding the load 200. [

That is, when the load 200 is added to the power distribution system 100, the control unit 20 adds the load 200 to the predetermined relay group to reset the predetermined relay group, When the load 200 is excluded from the power distribution system 100, the control unit 20 controls the predetermined relay group to exclude the load 200 from the predetermined relay group, By resetting the set relay group, the monitoring range of the protection relay 50 can be narrowed.

The control unit 20 may reset the preset reference value according to the load capacity of the resetting relay group.

That is, the control unit 20 may reset the predetermined reference value according to the load capacity of the reset relay group so that the operation control of the protection device 60 is performed according to the reset relay group.

The control unit 20 upwardly resets the predetermined reference value when the reset relay group is reset by adding the load 200 and the reset relay group is reset when the reset relay group is excluded from the load 200 , The predetermined reference value can be reset downward.

For example, when the load 200 of 10 [KW] is added to the predetermined relay group of 50 [KW], the load capacity of the reset relay group is 10 [ The control unit 20 sets the predetermined reference value upward according to the load capacity 60 [KW] of the resetting relay group, and the control unit 20 sets the upper limit value of 50 [KW] When the load 200 of 10 [KW] is excluded from the predetermined relay group, the load capacity of the reset relay group is reduced to 40 [KW] with a reduction of 10 [KW] in the load capacity of the predetermined relay group The control unit 20 may reset the predetermined reference value in accordance with the load capacity of the reset relay group 40 [KW].

The protection relay 50 for resetting the predetermined relay group and the predetermined reference value in the process described above can re-monitor the distribution system 100 according to the reset relay group and the reset reference value have.

An example according to an embodiment of the protective relay disclosed herein will be described below with reference to Figs. 4 and 5. Fig.

4 is an exemplary view showing an application example according to the embodiment of the protection relay disclosed in this specification.

5 is a flowchart showing an operation sequence according to an embodiment of the protection relay disclosed in this specification.

The protection relay 50 may be applied to a system including a plurality of the power distribution systems 100 as shown in FIG.

The power distribution system 100 may include a power distribution system A 100A and a power distribution system B 100B as shown in FIG.

Each of the power distribution system A 100A and the power distribution system B 100B is connected to each of loads 200A and 200B including respective protective relays 50A and 50B and respective protective devices 60A and 60B Power can be distributed to be supplied with electric power, and can be connected through the TIE protective device 60T.

The TIE protective device 60T may be connected to the power distribution system A 100A and the power distribution system B 100B to perform the connection and protection function between the power distribution systems 100A and 100B.

The protective relay A 50A included in the power distribution system A 100A sets the load A 200A included in the power distribution system A 100A as the predetermined relay group, (100A) by controlling the operation of the protective device A (60A) in accordance with the predetermined relay group and the predetermined reference value, and controlling the power distribution system B The protective relay B 50B included in the distribution system B 100B sets the load B 200B included in the distribution system B 100B as the predetermined relay group, And may monitor the power distribution system B (100B) by controlling the operation of the protective device B (60B) according to the predetermined relay group and the preset reference value.

The power distribution system A (100A) and the power distribution system B (100B) can be monitored by a monitoring panel (70).

The monitoring panel 70 monitors the power distribution system A 100A and the power distribution system B 100B to monitor the protection relay A 50A and the protection relay B 50B, The operation state of the protection device B 60B and the statuses of the load A 200A and the load B 200B are checked to determine whether or not the change of the distribution system A 100A and the distribution system B 100B To the protection relay A (50A) and the protection relay B (50B), respectively.

The protection relay A 50A and the protection relay B 50B may monitor the power distribution system A 100A and the power distribution system B 100B in the order as shown in Fig.

The protection relay A 50A and the protection relay B 50B are respectively connected to the protection relay A 50A and the protection relay B 50B in accordance with the load A 200A and the load B 200B, The protective relay B 50B sets the relay group to include the L3 and detects the relaying elements in accordance with the predetermined relay group so that each of the power distribution system A 100A and the power distribution system B 100B Can be monitored.

And controls the protective device A (60A) to operate when the relay element A (100A) has an abnormality and the relay element detected by the protective relay A (50A) exceeds the preset reference value, A 100A to be disconnected, and to control the TIE protective device 60T to operate so as to be associated with the distribution system B 100B.

When the TIE protective device 60T operates and the power distribution system A 100A and the power distribution system B 100B are connected, the load A 200A included in the power distribution system A 100A is connected to the power distribution system A B 100B and the protective relay B 50B resets the predetermined relay group so that L1 and L2 corresponding to the load A 200A are added to the predetermined relay group, L1, L2, L3 may be included in the reset relay group of the protection relay B (50B).

The protection relay B 50B resets the predetermined reference value in accordance with the reset relay group including L1, L2 and L3, and switches the power distribution system A (100A) to the reset relay group B (50A) according to the reset relay group and the reset reference value. ) And the power distribution system B (100B).

The protective relay A 50A controls the protective device A 60A and the TIE protective device 60T to return to their original state when the power distribution system A 100A is in a normal state, The load A 200A that has been supplied power from the power distribution system A (100B) is supplied again from the power distribution system A (100A), and the protection relay B (50B) It is possible to reset the reset relay group to include only L3 excluding the corresponding L1 and L2.

Thereafter, the protection relay B (50B) resets the reset reference value in accordance with the reset relay group reset to include only L3, and switches the power distribution system B (50B) according to the reset relay group and the reset reference value ) May be re-monitored.

Embodiments of the protection relays disclosed herein may be applied to relays and relay systems.

Embodiments of the protection relays disclosed in this specification can be applied to circuit breakers, controllers, switchgear, power protection devices, earth leakage breakers, and switchgear.

Embodiments of the protection relays disclosed in this specification can be applied to distribution boards, distribution apparatuses, distribution boards, power distribution apparatuses, and system systems.

Embodiments of the protection relays disclosed in this specification can be applied to equipment protection devices, facility control devices, measurement devices, and other protection relay systems.

Embodiments of the protective relays disclosed herein can be particularly usefully applied to a distribution system in which one or more switchboards are associated.

The protective relay disclosed in this specification has an effect of monitoring the distribution system according to the resetted relay group by resetting the predetermined relay group which is the monitoring range for monitoring the power distribution system according to the line and load variation of the power distribution system.

The protective relay disclosed in this specification has an effect that flexible monitoring can be performed according to the variation of the power distribution system by monitoring the power distribution system according to the power distribution group line and the power supply group reset in accordance with the load variation.

The protection relay disclosed in this specification monitors a distribution system according to a distribution group and a relay group that is reset in accordance with a load variation to thereby prevent erroneous detection and malfunction of the relay due to no change in the distribution system It is effective.

The protection relay disclosed in this specification has an effect of preventing an accident from spreading and preventing an abnormal generation of an additional system by monitoring the distribution system according to a distribution group and a relay group that is reset according to a load variation.

The protective relay disclosed in this specification monitors the power distribution system according to the power distribution group and the relay group reset according to the load fluctuation to prevent the accident from spreading and prevents the occurrence of abnormality of the additional system so that the power distribution system can be more stably protected There is an effect to be.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention as defined by the appended claims. It will be appreciated that such modifications and variations are intended to fall within the scope of the following claims.

10: detecting unit 20:
50: Protection Relay 50A: Protection Relay A
50B: Protection relay B 60: Protection device
60A: Protective device A 60B: Protective device B
60T: TIE protection device 70:
100: Power distribution system 100A: Power distribution system A
100B: Distribution system B 200: Load
200A: load A 200B: load B

Claims (11)

In a protection relay included in the power distribution system,
A detecting unit for monitoring the power distribution system according to a predetermined relay group to detect relay elements; And
And a control unit for controlling the operation of the protection device for protecting the power distribution system according to a result of the comparison by comparing the detected relaying element with a preset reference value and for resetting the predetermined relaying group and the predetermined reference value according to the variation of the power distribution system And a control unit for controlling the operation of the protection relay.
The method according to claim 1,
The power distribution system includes:
And is connected to another adjacent power distribution system.
The method according to claim 1,
The predetermined relay group includes:
And a group for at least one load supplied with power from the power distribution system.
The method according to claim 1,
Wherein the relay element comprises:
Is an element that is an operation basis of the protective device,
The predetermined reference value may be,
Wherein the protective relay is an operation criterion of the protective device with respect to the relay element.
The method according to claim 1,
Wherein,
When the detected relay element exceeds the preset reference value,
Controls the protective device to operate,
When the detected relaying element is less than or equal to the preset reference value,
And controls the protection device so as not to operate.
The method according to claim 1,
Wherein,
Generates a control signal for controlling the operation of the protective device according to the comparison result, and transmits the control signal to the protection device to control the operation of the protection device.
The method according to claim 1,
Wherein,
Wherein the protection relay device communicates with the monitoring device for monitoring the protection device and the power distribution system and receives information on whether the power distribution system changes from at least one of the protection device and the monitoring panel.
8. The method of claim 7,
Wherein,
And reestablishes the predetermined relay group and the predetermined reference based on information on whether the received distribution system is changed or not.
9. The method according to any one of claims 1 to 8,
Wherein,
Resetting the preset relay group according to a variation of a load supplied with electric power from the power distribution system,
When the load is added to the distribution system,
Resetting the predetermined relay group by adding the load to the predetermined relay group,
When the load is excluded from the distribution system,
And resetting the predetermined relay group by excluding the load from the predetermined relay group.
10. The method of claim 9,
Wherein,
And resetting the preset reference value according to the load capacity of the reset relay group.
11. The method of claim 10,
Wherein,
If the reset relay group is reset with the load added,
Resetting the preset reference value upward,
If the reset relay group is reset after the load is excluded,
Resetting the predetermined reference value downward,
Monitoring the power distribution system according to the reset relay group and the reset reference value.

Images