KR20180106129A - System and Method for measuring On-line Trip/Close Surge for Circuit Breaker Equipment - Google Patents

Abstract

The present invention relates to a switching surge live wire measuring technique. More specifically, the present invention relates to a system and a method for measuring a switching surge live wire capable of measuring a switching surge when switching a switching device of a gas insulated switchgear (GIS) structure in a live wire state. According to the present invention, the present invention can ensure an analysis technique for a signal measured through switching surge waveform data accumulation by utilizing a high frequency property in the live wire state. The switching surge live wire measuring system comprises: multiple measuring sensors; an input part; an acquisition processing part; and a display analysis part.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and method for measuring an open /

More particularly, the present invention relates to an open / closed surge active line measurement system capable of measuring an open / close surge when opening / closing a GIS (Gas Insulated Switchgear) And methods.

A paper on the detection of re - pointing by non - invasive method was presented when the circuit breaker was opened and closed. As a result, there have been reported cases in which open-circuit surge is measured and used in a transformer, a power capacitor, and a parallel reactor bank when a breaker is opened and closed (IEEE, 2014 CMD).

In addition, a circuit breaker disclosed in overseas is applied so that the opening / closing surge is minimized by using a circuit breaker equipped with a synchronous phase control device used for preventing re-issuance or re-opening at the time of opening and closing. However, it is still under development in Korea and is not applied.

In addition, the circuit breaker was operated after a high voltage was applied through a separate device capable of applying a high voltage after the shutdown device was generally shut down. The signals generated at this time were measured to analyze the re - visit or re - call signals.

In the case of overseas, technology for measuring the high and low frequency voltage waveforms occurring during the reactor opening and closing operation by applying the non-invasive measurement technique to the open-circuit bus, the circuit breaker and the point connected by the parallel reactor is applied. However, in Korea, most of the facilities are composed of GIS (Gas Insulated Switchgear). GIS (Gas Insulated Switchgear) is a device that protects the power system by opening and closing the line safely not only in the normal state of opening and closing but also in the abnormal state such as accident or short circuit.

Measuring with non-invasive measurement techniques typically requires significant time outages for expensive equipment and circuit breakers. That is, there is a problem that it is impossible to measure in the live state.

1. Korean Registered Patent No. 10-0305615 (Registered Date: August 1, 2001) 2. Japanese Laid-Open Patent No. 1993-300617

The present invention has been proposed in order to solve the problem according to the above background art, and it is an object of the present invention to provide an open / close surge capable of improving the facility reliability by analyzing the deterioration factor of the facility by measuring the open / close surge when the open / And to provide a live-line measurement system and method.

The present invention provides an open / closed surge active line measurement system capable of improving facility reliability by analyzing deterioration factors of facilities by measuring open / close surge when opening / closing the open / close apparatus in a live state to achieve the above problems.

The open / close surge active line measuring system includes:

A plurality of measurement sensors installed on the opening and closing device for measuring the opening and closing surge on the live line;

An input unit for receiving an analog measurement signal from the plurality of measurement sensors and converting the analog measurement signal into a digital measurement signal;

An acquisition processing unit for processing the digital measurement signal using a measurement waveform; And

And analyzing the frequency of the measured waveform to determine whether the open / close surge has occurred according to the frequency magnitude, and displaying a result of the determination.

The acquisition processing unit may include a watch dog unit that generates a reset signal and performs initialization when the acquisition processing unit is stopped due to noise or an error.

In addition, the frequency band for the frequency analysis may be selected to be 1 MHz or less.

In addition, the plurality of measurement sensors may be a sensor made of a printed circuit board (PCB) to ensure the same performance.

In this case, the plurality of measurement sensors may be a flexible material.

In addition, the plurality of measurement sensors may further include a case for avoiding exposure of the PCB.

Further, the case may be characterized by being flexible so as to be easily attached to the spacer of the opening / closing apparatus.

Further, the case may be characterized in that a plurality of fluorescent portions are repeatedly formed on the outside in order to facilitate identification.

Further, the opening / closing device may be a gas insulated switchgear (GIS).

The input unit may include: a filter unit for receiving an analog measurement signal from the measurement sensor and removing noise; An amplification unit for amplifying the analog measurement signal from which the noise is removed to generate an amplification measurement signal; And an A / D (Analog / Digital) converter for converting the amplified measurement signal into a digital measurement signal.

The filter unit may include a high-pass filter that passes an analog measurement signal that is greater than 60 Hz of the analog measurement signal, and a low-pass filter that passes an analog measurement signal that is less than 1 MHz in the analog measurement signal.

The A / D converter may be a high-speed A / D converter.

On the other hand, another embodiment of the present invention is a measurement method comprising: a measurement step of measuring an opening / closing surge on a live line using a plurality of measurement sensors installed in an opening / closing device; A converting step of an input unit receiving an analog measurement signal from the plurality of measurement sensors and converting the analog measurement signal into a digital measurement signal; A waveform processing step in which the acquisition processing section processes the digital measurement signal into a measurement waveform; And a display analyzing step of analyzing the frequency of the measurement waveform to determine whether the open / close surge has occurred according to the frequency magnitude, and displaying a determination result.

The step of processing may include the step of generating a reset signal and performing initialization when the watch dog unit is stopped due to noise or an error.

The converting step may include a noise removing step of receiving noise from an analog measurement signal from the measurement sensor using a filter unit, A measurement signal generation step of amplifying an analog measurement signal from which noise has been removed by using an amplification unit to generate an amplification measurement signal; And an A / D (Analog / Digital) converter to convert the amplified measurement signal into a digital measurement signal.

The noise removing step may include: passing an analog measurement signal greater than 60 Hz of the analog measurement signal using a high-pass filter; And passing an analog measurement signal less than 1 MHz out of the analog measurement signal using a low-pass filter.

According to the present invention, it is possible to secure an analytical technique for a signal measured through the accumulation of waveform data of an open / close surge by utilizing a high frequency characteristic in a live state.

Another advantage of the present invention is that it is possible to improve the reliability and / or performance of the electric power facility by setting appropriate improvement measures for electric power facilities by continuous measurement.

1 is a circuit diagram of a conventional capacitive divider.
2 is an equivalent circuit diagram for Fig.
3 is a circuit diagram 300 illustrating the principle of live sensor measurement according to an embodiment of the present invention.
4 is a conceptual diagram showing the resonant mode of the reactor circuit according to FIG.
5 is a block diagram of the open / closed surge active line measurement system 500 according to an embodiment of the present invention.
FIG. 6 is a detailed configuration diagram of the input unit 540 shown in FIG.
7 is a front view of a sensor for attaching a spacer, which is connected to the input unit 540 shown in FIG. 5 and provides a measurement signal.
FIG. 8 is an example in which the open / close surge active line measurement system 500 shown in FIG. 5 is applied.
9 is a perspective view of the spacer mounting sensor shown in Fig.
10 is a front view of a sensor for measuring a ground portion as another embodiment.
11 is an example of attaching to the spacer with the spacer mounting sensor shown in Fig.
Fig. 12 is an example of attaching an epoxy to the sensor for measuring the ground portion shown in Fig.
FIG. 13 is a waveform graph obtained by analyzing the measured waveform frequency in the open / close surge active line measurement system 500 shown in FIG.
14 is an example of a measurement program installed in the open / close surge active line measurement system 500 shown in Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an open / closed surge active line measuring system and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of a conventional capacitive divider, and FIG. 2 is an equivalent circuit diagram of FIG. Referring to FIGS. 1 and 2, when a circuit breaker is cut off, the transient phenomenon signal is measured by the current flowing through the actual load and the voltage at the time of interruption although the current does not flow because the voltage after the cutoff is ideally zero. The high-voltage conductor can generate a surge waveform around the conductor and measure the surge waveform with the voltage induced in this electric field. Measure the radio (radio / radio wave) pulse that occurs at this time.

3 is a circuit diagram 300 illustrating the principle of live sensor measurement according to an embodiment of the present invention. Referring to FIG. 3, the sensor capable of performing live-line measurement includes a shielded passive antenna corresponding to a high-low frequency by coupling a capacitive sensor structure to a spacer 350 near a power line to connect RC terminals 370 and 380 between the sensor and ground. The overvoltage flowing from the transformer 320 to the switching device 330 is measured. In other words, the sensor and the antenna are integrated together.

4 is a conceptual diagram showing the resonant mode of the reactor circuit according to FIG. Referring to FIG. 4, in the frequency band and the measurement principle, the overvoltage frequency by the capacitor bank is about 1.2 kHz, the chopping by the reactor bank, the voltage frequency is about 5 kHz, Can be measured at several hundred kHz.

Since the first parallel oscillation 410 and the second parallel oscillation 420 can occur up to about 1 MHz during the oscillation, the sensor can be configured to measure the measurement frequency up to 10 MHz. This oscillation is described in the paper " INVESTIGATION OF CIRCUIT BREAKER SWITCHING TRANSIENTS FOR SHUNT REACTORS AND SHUNT CAPACITORS ", 2008, Mohd Shamir Ramli, B. Eng.

In addition, it is difficult to distinguish the oscillation signal to be measured, and the measurement frequency can be selected to be 1 MHz or less.

5 is a block diagram of the open / closed surge active line measurement system 500 according to an embodiment of the present invention. 5, the open / close surge active line measurement system 500 includes a plurality of measurement sensors installed in the opening / closing device for measuring an open / close surge on a live line, An acquisition unit 550 for converting the measurement waveform into a measurement signal, an acquisition unit 550 for processing the measurement waveform using the digital measurement signal, a frequency analysis unit 560 for determining whether the open / close surge has occurred according to the frequency, A communication unit 530 for connecting the acquisition processing unit 550 and the display analysis unit 520 by communication, a main power supply unit 510 for supplying power to the components, and the like. .

The input unit 540 includes first through n-th filter units 541-1 through 541-n, first through n-th amplifying units 542-1 through 541-n for each channel for receiving and processing measurement signals from a plurality of measurement sensors, To 542-n, first to nth A / D (Analog / Digital) converters 543-1 to 543-n, and the like.

The acquisition processing unit 550 includes a DSP (Digital Signal Processor) 551 that processes the digital measurement signal input from the input unit 540 to generate measurement waveform information, a processor 551 that processes information received from the DSP 551, A programmable logic device (PLD) 553 that performs a function of storing the processed signal in the communication unit 530 and transmitting it to the communication unit 530, a program having an algorithm for storing the processed signal and processing the input digital measurement signal to generate measurement waveform information A clock generator 554 for providing real-time clock information to the PLD 553, and the like.

The storage unit 555 may be a flash memory (SSD), a hard disk drive, a flash memory, an electrically erasable programmable read-only memory (EEPROM), a static random access memory (SRAM), a ferro- Volatile memory such as a phase-change RAM, an MRAM (Magnetic RAM), and / or a volatile memory such as a DRAM (Dynamic Random Access Memory), an SDRAM (Synchronous Dynamic Random Access Memory), a DDR-SDRAM (Double Date Rate- Memory. ≪ / RTI >

The watch dog unit 552 performs a function of generating a reset signal and performing initialization when the operation of the DSP 551 and / or the PLD 553 is stopped due to noise or an error or in an infinite loop.

The display analysis unit 520 may be connected to an external USB (Universal Serial Bus). Also, the main power supply 510 performs a function of supplying power (for example, about 12 V) to other components from a battery (not shown). Of course, the main power supply 510 may be supplied with external power.

FIG. 6 is a detailed configuration diagram of the input unit 540 shown in FIG. 6, the input unit 540 includes a high pass filter 610 for passing an analog measurement signal larger than 60 Hz among the analog measurement signals, a low pass filter 610 for passing an analog measurement signal smaller than 1 MHz An amplifier 630 for amplifying the signal passed through the filter 630, an A / D converter 640 for converting the amplified analog signal into a digital signal, a buffer 650 for temporarily storing the converted signal, and the like .

In addition, the signal measured through the sensor has several frequency components, including noise. Therefore, if the size of the signal is small, the sharpness of the measurement signal may be lowered, so that the input unit 540, which is an input channel, is constructed as shown in FIG.

7 is a front view of a sensor for attaching a spacer, which is connected to the input unit 540 shown in FIG. 5 and provides a measurement signal. Referring to Fig. 7, a measurement sensor 331 is installed inside the case. The measurement sensor 331 may be a sensor made of a printed circuit board (PCB) to ensure the same performance. In addition, the measurement sensor 331 may be a flexible material so as to easily attach to the spacer (350 in FIG. 3).

The case may be characterized in that a plurality of fluorescent portions 730 are repeatedly formed outside to facilitate identification. That is, when the user of the open / close surge active line measurement system 500 carries the measurement sensor 331 and installs the measurement sensor 331, the position is easily found.

FIG. 8 is an example in which the open / close surge active line measurement system 500 shown in FIG. 5 is applied. 8, the measurement sensor 331 of the open / close surge active line measuring system 500 is installed in the spacer 350 of the opening and closing device 330, connected to the external power source 810, connected to the ground 820, do.

9 is a perspective view of the spacer mounting sensor shown in Fig. Referring to FIG. 9, in the structure of the opening / closing device 330 such as a GIS, the tank portion (not shown) is connected to the ground and the capacitive signal can not be measured. Therefore, the sensor is attached to the epoxy spacer, Measure the signal by connecting a spacer mounting sensor to the connected epoxy. Of course, the measurement sensor 331 may be formed on the inner side of the case 710, and the case 710 may be formed of a flexible material to facilitate attachment to the spacer 350 of the opening / closing device 330. In addition, the case is designed to avoid PCB exposure during field installation.

10 is a front view of a sensor for measuring a ground portion as another embodiment. Referring to FIG. 10, the sensor is similar to the measurement sensor shown in FIG. 7, and has a reduced width for installation in a portion that is difficult to measure.

11 is an example of attaching to the spacer with the spacer mounting sensor shown in Fig.

Fig. 12 is an example of attaching an epoxy to the sensor for measuring the ground portion shown in Fig.

13 is a waveform graph obtained by analyzing the measured waveform frequency in the open / close surge active line measurement system 500 shown in FIG. Referring to FIG. 13, the frequency of the red square box is measured in the frequency analysis of the acquired signal. That is, this represents the occurrence of open / close surge. The magnitude of this signal is about -65 dBm and the frequency is about 178 kHz. When the frequency of other signals measured is analyzed, frequencies of about 150 kHz to 200 kHz or less are the largest measured. 13, the upper graph shows a measurement waveform 1310 as an entire measurement signal, and the lower graph shows a frequency size according to a frequency analysis result. The green graph is an example in which 1 MHz LPF is applied.

Referring to FIG. 13, the frequency of the red square box appears once. In this case, the open / close surge is removed to show a stabilized state.

14 is an example of a measurement program installed in the open / close surge active line measurement system 500 shown in Fig. Referring to Fig. 14, the measurement program is developed similar to Oscilloscope to be familiar with the use. Time adjustment and / or size adjustment is possible and measurement data is automatically stored in the storage unit (555 in FIG. 5).

Therefore, live-line measurement is possible, measurement method is easy, and it is easy to construct on-site.

500: Open / closed surge live wire measurement system
510: main power supply
520: display analysis unit
530:
540: Input section
550:

Claims (20)

A plurality of measurement sensors installed on the opening and closing device for measuring the opening and closing surge on the live line;
An input unit for receiving an analog measurement signal from the plurality of measurement sensors and converting the analog measurement signal into a digital measurement signal;
An acquisition processing unit for processing the digital measurement signal using a measurement waveform; And
A display analyzer for frequency-analyzing the measured waveform to determine whether the open / close surge has occurred according to a frequency magnitude and display a determination result;
Wherein the open / close surge active line measurement system comprises:
The method according to claim 1,
Wherein the acquisition processing unit includes a watch dog unit configured to generate a reset signal to perform initialization when a noise or an error causes the stop signal to stop.
The method according to claim 1,
Wherein the frequency band for the frequency analysis is selected to be 1 MHz or less. The method according to claim 1,
Wherein the plurality of measurement sensors are sensors made of PCBs (Printed Circuit Boards) to ensure the same performance.
5. The method of claim 4,
Wherein the plurality of measurement sensors are of a flexible material.
5. The method of claim 4,
Wherein the plurality of measurement sensors further include a case for avoiding exposure of the PCB.
The method according to claim 6,
Wherein the case is made of a flexible material so as to be easily attached to a spacer of the opening / closing device. The method according to claim 6,
Wherein the case has a plurality of fluorescent parts repeatedly formed on the outside so as to easily identify the opening / closing surge active line.
The method according to claim 1,
Wherein the opening / closing device is a gas insulated switchgear (GIS).
The method according to claim 1,
Wherein the input unit comprises:
A filter unit for receiving an analog measurement signal from the measurement sensor and removing noise;
An amplification unit for amplifying the analog measurement signal from which the noise is removed to generate an amplification measurement signal; And
And an A / D (Analog / Digital) converter for converting the amplified measurement signal into a digital measurement signal.
11. The method of claim 10,
Wherein the filter unit comprises a high-pass filter that passes an analog measurement signal that is greater than 60 Hz of the analog measurement signal, and a low-pass filter that passes an analog measurement signal that is less than 1 MHz in the analog measurement signal.
11. The method of claim 10,
Wherein the A / D converter is a high-speed A / D converter.
A measurement step of measuring an open / close surge on a live line using a plurality of measurement sensors provided on the opening / closing device;
A converting step of an input unit receiving an analog measurement signal from the plurality of measurement sensors and converting the analog measurement signal into a digital measurement signal;
A waveform processing step in which the acquisition processing section processes the digital measurement signal into a measurement waveform; And
A display analyzing step of frequency analyzing the measurement waveform to determine whether the opening / closing surge has occurred according to a frequency magnitude and displaying a determination result;
And measuring the open / closed surge active line.
14. The method of claim 13,
Wherein the step of processing comprises the step of generating a reset signal and performing initialization when the watch dog is stopped due to noises or errors.
14. The method of claim 13,
Wherein the plurality of measurement sensors are sensors made of PCBs (Printed Circuit Boards) to ensure the same performance.
16. The method of claim 15,
Wherein the plurality of measurement sensors further include a case for avoiding exposure to the PCB.
14. The method of claim 13,
Wherein the opening / closing device is a gas insulated switchgear (GIS). 14. The method of claim 13,
Wherein,
A noise removing step of receiving noise from an analog measurement signal from the measurement sensor using a filter unit;
A measurement signal generation step of amplifying an analog measurement signal from which noise has been removed by using an amplification unit to generate an amplification measurement signal; And
And converting the amplified measurement signal into a digital measurement signal using an A / D (Analog / Digital) converter.
19. The method of claim 18,
Removing the noise comprises passing an analog measurement signal greater than 60 Hz of the analog measurement signal using a high pass filter; And passing an analog measurement signal smaller than 1 MHz among the analog measurement signals using a low pass filter.
20. The method of claim 19,
Wherein the A / D converter is a high-speed A / D converter.

Images