KR20170037347A

KR20170037347A - Diagnostic device and method for partial discharge of solid insulated switchgear

Info

Publication number: KR20170037347A
Application number: KR1020150136823A
Authority: KR
Inventors: 이승용
Original assignee: 한국전력공사
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2017-04-04

Abstract

The solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention includes a first sensor unit for sensing a temperature of a solid insulated switchgear and outputting temperature data; A second sensor unit for sensing electromagnetic waves generated from the solid insulation switching device and outputting electromagnetic wave data; And a monitoring unit comparing the temperature data with a first threshold value and comparing the electromagnetic wave data with a second threshold value to determine whether the solid insulated switchgear is partially discharged.

Description

TECHNICAL FIELD [0001] The present invention relates to a solid insulated switchgear, and more particularly,

The present invention relates to a solid insulated switchgear partial discharge monitoring apparatus and method.

A gas insulated switchgear (GIS) is often used as a line switchgear for receiving and distributing ultra-high voltage power to the customer.

However, the SF6 gas sealed in the enclosure of the switchgear is one of the representative greenhouse gases in order to quickly extinguish the arc generated when the circuit breaks or breaks the superhigh-pressure line.

Accordingly, a solid insulated switchgear (SIS) using a solid insulator using an epoxy or the like has been developed to replace the SF6 gas.

Partial discharge due to insulator defects in solid insulated switchgear may cause accidents such as fire. Therefore, in order to prevent accidents and to operate steadily, the above monitoring device capable of rapid diagnosis and precise analysis is needed.

Currently, the method of monitoring the partial discharge of the solid insulated switchgear is to measure the discharge current leaked to the ground using a HFCT (High Frequency Current Transformer) sensor and to measure the temperature according to the inspection cycle using the portable temperature measuring device Has been used.

However, the method using the HFCT sensor is difficult to track the position of the partial discharge, and the method using the portable temperature measuring device poses a risk of electric shock, and it is difficult to continuously monitor.

The prior art related to the solid insulated switchgear can be understood with reference to the following Patent Document.

Korea Patent Publication No. 2012-0077703

According to an embodiment of the present invention, there is provided a solid insulated switchgear partial discharge monitoring apparatus and method for always monitoring partial discharge of a solid insulated switchgear device through a two-stage terminal using an infrared thermopile array sensor and a microwave sensor.

The solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention includes a first sensor unit including a plurality of infrared thermopile array sensors and sensing a temperature of the solid insulated switchgear and outputting temperature data; A second sensor unit including a plurality of ultra-high frequency (UHF) sensors, for sensing electromagnetic waves generated by the solid insulation switching device and outputting electromagnetic wave data; And a monitoring unit comparing the temperature data with a first threshold value and comparing the electromagnetic wave data with a second threshold value to determine whether the solid insulated switchgear is partially discharged.

The apparatus and method for monitoring partial discharge of a solid insulated switchgear according to an embodiment of the present invention monitor a partial discharge of a solid insulated switchgear device through a two-stage terminal using an infrared thermopile array sensor and a microwave sensor, Effect.

1 is a schematic diagram showing a solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention.
2 is a configuration diagram of a solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention.
3 is a flowchart of a method for monitoring partial discharge of a solid insulated switchgear according to an embodiment of the present invention.
4 is temperature map data based on the temperature data output from the infrared thermopile array sensor.
5 is a three-dimensional graph of a PRPS (Phase Resolved Pulse Sequence) signal based on electromagnetic wave data output from a microwave sensor.
6 is a two-dimensional graph of a PRPS system signal based on electromagnetic wave data output from an ultrasonic wave sensor.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment.

Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a schematic diagram showing a solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the solid insulated switchgear partial discharge monitoring device 200 according to an embodiment of the present invention can be installed in a cubic metal 10 accommodating a solid insulated switchgear 100.

For example, the solid insulated switchgear 100 includes a bus connection part 110, a vacuum cut-off part 120, a ground switch part 130, a disconnector 140, a surge absorption part 150 and a current transformer 160 can do.

The current transformer 160 provides a detection current signal that is proportional to the current of the received power, and the surge absorption unit 150 can absorb a surge caused by lightning or the like.

The disconnecting unit 140 may cut off the current flow to the grounding switching unit 130 at the rear end by cutting off the electric current and the grounding switching unit 130 may supply the current to the vacuum interrupting unit 120 Current flow can be blocked.

The vacuum interrupter 120 may be driven by the actuator to the shutoff position.

The configurations of the solid insulated switchgear 100 can be insulated with solid insulators, and partial discharges can be caused by insulator defects.

The solid insulated switchgear partial discharge monitoring apparatus 200 according to an embodiment of the present invention includes a first sensor unit 210, a second sensor unit 220, and a monitoring unit 230, It is possible to determine whether or not the discharge lamp 100 is partially discharged. Although the first sensor unit 210 and the second sensor unit 220 are shown as being installed close to the bus connection unit 110 in FIG. 1, the solid-state insulation switchgear 100 may be installed The position can be changed.

The first sensor unit 210 is constituted by a plurality of infrared thermopile array sensors, and can sense temperature of the solid insulation switching device and output temperature data.

Specifically, the infrared thermopile array sensor may include a plurality of infrared absorbers and a plurality of thermocouples receiving the thermal energy generated by the plurality of infrared absorbers to generate electromotive force.

The second sensor unit 220 is composed of a plurality of ultra-high frequency (UHF) sensors, and can sense electromagnetic waves generated by the solid insulation switching device and output electromagnetic wave data.

Since the entrance of the external noise can be blocked by the cubicle 10 made of the metal in the inside of the cubicle 10 in which the second sensor unit 220 is mounted, the accuracy of the electromagnetic wave data output from the second sensor unit 220 Can be improved.

The microwave sensor may have a frequency detection band in the UHF band (300 to 3000 MHz) and may include a plurality of microwave sensors according to the configuration of the solid insulated switchgear 100 to be monitored.

The monitoring unit 230 may compare the temperature data with a first threshold value and compare the electromagnetic wave data with a second threshold value to determine whether the solid insulated switchgear is partially discharged.

The temperature data may include at least one of a temperature instantaneous value and a temperature change value.

2 is a configuration diagram of a solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention.

2, the solid insulated switchgear partial discharge monitoring apparatus 200 according to an embodiment of the present invention includes a first sensor unit 210, a second sensor unit 220, and a monitoring unit 230 do.

For example, the first sensor unit 210 may include eight infrared thermopile array sensors 210-1 through 210-8, and each infrared thermopile array sensor may be connected to the monitoring unit 230. [ Here, the first sensor unit 210 may have a resolution of 80 X 60.

In addition, the second sensor unit 210 may include eight microwave (UHF) sensors, and each microwave sensor may be connected to the monitoring unit 230 through an SMA jack.

The monitoring unit 230 may be implemented by a combination of hardware such as a microprocessor and software programmed to perform the predetermined operation. The first sensor unit 210 and the second sensor unit 220 may include an A / D converter for converting the analog data output from the first sensor unit 210 and the second sensor unit 220 into digital data.

In addition, the monitoring unit 230 may transmit the partial discharge alarm to the remote control unit 320 through the remote transmission apparatus 310. [

Meanwhile, the remote controller 320 may be included in a SCADA (Supervisory Control and Data Acquisition) system or may be associated with a SCADA system.

Also, the monitoring unit 230 can output temperature map data based on the temperature data and a PRPS (Phase Resolved Pulse Sequence) signal based on the electromagnetic wave data.

Here, the phase resolved pulse sequence (PRPS) is a partial discharge analysis method considering a time factor in a phase resolved partial discharge (PRPD) which is one of waveform pattern analysis methods.

Meanwhile, the HMI (Human Machine Interface) connected to the monitoring unit 230 can receive and display the temperature map data and the PRPS signal.

Accordingly, the solid insulated switchgear partial discharge monitoring apparatus according to an embodiment of the present invention can constantly monitor the solid insulated switchgear, and can detect the portion of the insulator defect due to the insulator defect or the like through the second stage using the infrared thermopile array sensor and the microwave sensor. The discharge position can be precisely analyzed.

3 is a flowchart of a method for monitoring partial discharge of a solid insulated switchgear according to an embodiment of the present invention.

Referring to FIG. 3, the solid insulated switchgear partial discharge monitoring method according to the present embodiment starts by setting an alarm condition (S310).

Meanwhile, the monitoring unit 230 (FIG. 2) may instruct the sensing of the temperature and the electromagnetic wave of the solid insulation switching device when the detection cycle is set in advance (S320).

Thereafter, the monitoring unit can sense the temperature of the solid insulation switching device using a plurality of infrared thermopile array sensors (S330), and can sense electromagnetic waves of the solid insulation switching device using a plurality of microwave sensors (S340 ).

Next, the monitoring unit acquires the temperature data output from the first sensor unit 210 (FIG. 2) and the electromagnetic wave data output from the second sensor unit 220 (FIG. 2), compares the temperature data with the first threshold value (S335), and the electromagnetic wave data may be compared with a second threshold value (S345).

If the temperature data exceeds the first threshold and the electromagnetic wave data exceeds the second threshold, the monitoring unit may determine whether the alarm condition is satisfied (S350).

If the alarm condition is satisfied, the monitoring unit may transmit the partial discharge information to the remote control unit through the remote transmission apparatus (S360).

In addition, the monitoring unit may output temperature map data based on the temperature data and a PRPS (phase resolved pulse sequence) signal based on the electromagnetic wave data (S370). On the other hand, the temperature map data and the PRPS signal can be output in real time immediately after the temperature and the electromagnetic wave are sensed.

4 is temperature map data based on the temperature data output from the infrared thermopile array sensor.

Referring to FIG. 4, the configuration including the solid insulated switchgear and the temperature distribution of the connection section can be confirmed.

FIG. 5 is a three-dimensional graph of a PRPS (Phase Resolved Pulse Sequence) signal based on electromagnetic wave data output from a microwave sensor, and FIG. 6 is a two-dimensional graph of the PRPS signal.

5 and 6, the phase and magnitude of the electromagnetic wave signal acquired from the microwave sensor can be confirmed with time.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

210: a first sensor unit
220: second sensor unit
230:

Claims

A first sensor unit for sensing a temperature of the solid insulated switchgear and outputting temperature data;
A second sensor unit for sensing electromagnetic waves generated from the solid insulation switching device and outputting electromagnetic wave data; And
A monitoring unit for comparing the temperature data with a first threshold value and for comparing the electromagnetic wave data with a second threshold value to determine whether the solid insulation switching on /
Wherein the solid insulated switchgear partial discharge monitoring device comprises:

The method according to claim 1,
Wherein the first sensor unit comprises a plurality of infrared thermopile array sensors,
Wherein the second sensor unit comprises a plurality of ultra-high frequency (UHF) sensors.

The method according to claim 1,
Wherein the monitoring unit transmits the partial discharge alarm to the remote control unit via the remote transfer device.

The method according to claim 1,
Wherein the monitoring unit outputs temperature map data based on the temperature data and a signal of a PRPS (Phase Resolved Pulse Sequence) method based on the electromagnetic wave data.

Sensing the temperature of the solid insulated switchgear;
Sensing an electromagnetic wave of the solid insulated switchgear;
Acquiring temperature data and electromagnetic wave data;
Comparing the temperature data with a first threshold value and comparing the electromagnetic wave data with a second threshold value to determine whether the solid insulated switchgear is partially discharged;
Wherein the solid insulated switchgear partial discharge monitoring method comprises:

6. The method of claim 5,
Wherein the sensing temperature senses the temperature of the solid insulated switchgear using a plurality of infrared thermopile array sensors,
Wherein the sensing of the electromagnetic waves senses electromagnetic waves of the solid insulated switchgear using a plurality of ultra-high frequency (UHF) sensors.

6. The method of claim 5,
Further comprising transmitting a partial discharge alarm through a remote transfer device to a remote control point.

6. The method of claim 5,
Further comprising the step of outputting temperature map data based on the temperature data and a signal of a PRPS (Phase Resolved Pulse Sequence) method based on the electromagnetic wave data.