KR101904648B1 - Wavelength division multiplexing system for detecting partial discharge - Google Patents
Wavelength division multiplexing system for detecting partial discharge Download PDFInfo
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- KR101904648B1 KR101904648B1 KR1020170033322A KR20170033322A KR101904648B1 KR 101904648 B1 KR101904648 B1 KR 101904648B1 KR 1020170033322 A KR1020170033322 A KR 1020170033322A KR 20170033322 A KR20170033322 A KR 20170033322A KR 101904648 B1 KR101904648 B1 KR 101904648B1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a partial discharge monitoring system using a wavelength division multiplexing method and a partial discharge monitoring system using a wavelength division multiplexing method according to an embodiment of the present invention includes a partial discharge monitoring system for monitoring a partial discharge of a substation, A plurality of partial discharge detection devices for allocating a unique wavelength band through a light conversion of a detection signal and transmitting the wavelength band by a wavelength division multiplexing method; And a signal processing / analyzing device for dividing the multiplexed optical signal by wavelength and performing signal processing and analysis of the optical signal.
Description
More particularly, the present invention relates to a wavelength division multiplexing type partial discharge monitoring system, and more particularly, to a partial discharge monitoring system for connecting a partial discharge detection device and a signal processing / analysis device to an optical fiber (optical fiber) To a signal processing / analyzing device through a wavelength division multiplexing method to monitor a partial discharge, thereby reducing the installation and maintenance cost of the system.
In recent years, there is an urgent need for stable supply of power, high quality, and high reliability due to the transition to an advanced industrial society, a knowledge information society, and changes in urban life. Accordingly, in order to secure the operation reliability of the power facilities, the maintenance method of the main substations of the substation is to be carried out at a time based maintenance (TBM: Time Based Maintenance) State-of-the-art (CBM) system that predicts and repairs the state of the system is introduced to strategically manage and manage efficient and economical maintenance plans.
For the state-based maintenance strategy of substation facilities (for example, gas insulated switchgear (GIS), transformers, lightning arresters, etc.), it is essential to deploy a substation surveillance system to diagnose the state of the power facilities in operation .
Diagnostic equipment applied to substation GIS or transformers includes a partial discharge monitoring system. 1 is a diagram showing a conventional substation partial discharge monitoring system.
The conventional partial discharge monitoring system includes a
The coaxial cable connecting the
Conventionally, three to six
In addition, in this conventional method, there is a high possibility that a connection failure occurs due to a plurality of connection points using a connector, and a poor contact due to a change in ambient temperature or deterioration of a coaxial cable may occur during long-term use outdoors.
In addition, since the conventional method places individual cables from the
The
On the other hand, when the partial discharge sensor and the signal processing apparatus are integrated, it is possible to connect to the control server by using the optical cable. In this method, since each of the partial discharge sensors individually performs signal processing and transmits data, signal processing for eliminating the influence of external noise through comparison after measuring the partial discharge signals detected by the respective partial discharge sensors is difficult . In this case, it is also difficult to calculate the discharge position in the time-of-arrival method using the time difference of the nanosecond (ns) region detected by each partial discharge sensor. In this case, it is mainly used as a low-cost monitoring apparatus which measures only the partial discharge around the partial discharge sensor.
An object of the present invention is to provide a signal processing / analyzing apparatus and a signal processing / analyzing apparatus, which connect a partial discharge detecting apparatus and a signal processing / analyzing apparatus to each other through an optical fiber (optical fiber), photodetect a partial discharge signal measured by the partial discharge detecting apparatus, To monitor the partial discharge, thereby reducing the installation and maintenance cost of the system.
It is another object of the present invention to provide a partial discharge monitoring system for integrating the functions of a signal processing unit (DAU) installed in various places of a substation into a single structure.
It is another object of the present invention to provide a partial discharge monitoring system for integrating a signal processing unit (DAU) and a control server into a single signal processing / analyzing unit and concentrating the signal processing / analyzing unit in a central monitoring center.
The wavelength division multiplexing type partial discharge monitoring system according to an embodiment of the present invention generates a partial discharge sensed signal by monitoring the partial discharge of the substation and converts the partial discharge sensed signal into an optical signal through photo- A plurality of partial discharge detection devices for allocating the optical signal to a specific wavelength band divided in the optical fiber wavelength band and transmitting the wavelength division multiplexed optical signal; And a signal processing / analysis apparatus for performing signal processing and analysis on the optical signal by demultiplexing the optical signal transmitted from each of the partial discharge detection devices into the specific wavelength band allocated to the optical signal, Each of the sensing devices includes: a partial discharge sensor for measuring the partial discharge detection signal; A light conversion unit for converting the partial discharge detection signal into the optical signal; And a multiplexer for allocating the specific wavelength band to the optical signal and transmitting the optical signal in a wavelength division multiplexing manner, wherein the signal processing / analysis apparatus comprises: It may be to identify each of the discharge sensing devices.
The partial discharge sensing device and the signal processing / analyzing device may be interconnected using one or more optical cables (optical fibers).
The partial discharge detection signal may include an abnormal signal and a normal signal of the substation.
delete
The signal processing / analysis apparatus includes a demultiplexer for demultiplexing the multiplexed optical signal by wavelength, A signal converter for converting the divided optical signal into a partial discharge detection signal and converting the divided optical signal into a digital electrical signal; A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And a partial discharge analyzer for analyzing the signal processed signal.
The WDM monitoring system according to an embodiment of the present invention generates a partial discharge sensed signal by monitoring the partial discharge of the substation and generates an optical signal through the optical conversion, A plurality of partial discharge detection devices for allocating the wavelength bands to a specific wavelength band divided in a wavelength band and transmitting the wavelength bands in a wavelength division multiplexing manner; And a signal processing / analysis apparatus for performing signal processing and analysis on the optical signal by demultiplexing the optical signal transmitted from each of the partial discharge sensing apparatuses to the specific wavelength band allocated to the optical signal, Each of the sensing devices includes: a partial discharge sensor for measuring the partial discharge detection signal; A digital converter for converting the partial discharge detection signal into a digital signal; A light converter for converting the digital signal into an optical signal; And a multiplexer for allocating the specific wavelength band to the optical signal and transmitting the optical signal in a wavelength division multiplexing manner, wherein the signal processing / analyzing apparatus comprises: It may be to identify each of the discharge sensing devices.
The signal processing / analysis apparatus includes a demultiplexer for demultiplexing the multiplexed optical signal by wavelength, A signal converter for converting the divided optical signal into a digital electrical signal; A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And a partial discharge analysis unit for analyzing the signal processed signal.
The partial discharge sensor may be one of a UHF sensor, a VHF / HF sensor, and an ultrasonic sensor.
The digital converter converts the partial discharge detection signal into one of a Pulse Code Modulation (PCM), a Pulse Width Modulation (PWM), and a Quadrature Amplitude Modulation (QAM) It can be converted into a digital signal according to the method.
The partial discharge monitoring system may further include a partial discharge sensing device and a signal processing / analyzing device, wherein the partial discharge sensing device and the signal processing / / Analyzing apparatus transmits and receives signals in a wavelength division multiplexing manner by interconnecting using one or more optical cables (optical fibers), and the partial discharge detecting apparatus detects a partial discharge detection signal measured to monitor a partial discharge of the substation A partial discharge sensor for measuring; A light conversion unit for converting the partial discharge detection signal into an optical signal; And a multiplexer for allocating the wavelength to the optical signal and transmitting the optical signal by a wavelength division multiplexing method, wherein the signal processing / analyzing apparatus comprises: a demultiplexer for dividing the multiplexed optical signal by wavelength; A signal converter for converting the divided optical signal into a digital electric signal; A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And a partial discharge analyzer for analyzing the signal processed signal.
The partial discharge monitoring system may further include a partial discharge sensing device and a signal processing / analyzing device, wherein the partial discharge sensing device and the signal processing / / Analyzing apparatus transmits and receives signals in a wavelength division multiplexing manner by interconnecting using one or more optical cables (optical fibers), and the partial discharge detecting apparatus detects a partial discharge detecting signal measured to detect a partial discharge of the substation facility A partial discharge sensor for measuring; A digital converter for converting the partial discharge detection signal into a digital signal; A light converter for converting the digital signal into an optical signal; And a multiplexer for allocating the wavelength to the optical signal and transmitting the optical signal by a wavelength division multiplexing method, wherein the signal processing / analyzing apparatus comprises: a demultiplexer for dividing the multiplexed optical signal by wavelength; A signal converter for converting the divided optical signal into a digital electrical signal; A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And a partial discharge analysis unit for analyzing the signal processed signal.
In the present invention, the partial discharge detection device and the signal processing / analysis device are connected by an optical cable (optical fiber), and the partial discharge signal measured by the partial discharge detection device is photo-converted and transmitted to the signal processing / So that the partial discharge can be monitored.
In addition, the present invention can integrate the functions of a signal processing unit (DAU) installed in various places of a substation into one configuration.
In addition, the present invention can be configured such that the signal processing unit (DAU) and the control server are integrated into a single signal processing / analysis apparatus and concentrated in a central monitoring center.
In addition, the present invention does not use a coaxial cable by wavelength division multiplexing the signals measured by a plurality of partial discharge sensors through one optical fiber from a partial discharge sensor to a signal processing / analyzing device by wavelength division multiplexing , Installation and maintenance costs can be greatly reduced.
In addition, since there is no loss due to loss or deterioration due to aging of an RF connector connecting a plurality of partial discharge sensors and a signal processing unit (DAU), system stability is improved and maintenance can be minimized.
In addition, since the functions of the signal processing unit (DAU) are integrated and concentrated in the central monitoring center, maintenance and management are easy since there is no influence due to changes in ambient conditions such as weather and temperature.
1 shows a conventional substation partial discharge monitoring system,
FIG. 2 illustrates a partial discharge monitoring system using a wavelength division multiplexing method according to an embodiment of the present invention; FIG.
3 is a diagram showing a detailed configuration of the partial discharge monitoring system of FIG. 2,
4 is a diagram illustrating an example of a wavelength spectrum of an optical signal transmitted through an optical fiber,
FIG. 5A is a diagram showing another embodiment of the partial discharge monitoring apparatus of FIG. 3,
FIG. 5B is a diagram showing another embodiment of the signal conversion unit of FIG. 3,
6 is a diagram showing redundancy of an optical cable (optical fiber) in the partial discharge monitoring system of FIG.
For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.
2 is a diagram illustrating a partial discharge monitoring system using a wavelength division multiplexing method according to an embodiment of the present invention.
2, a partial discharge monitoring system (hereinafter referred to as a "partial discharge monitoring system") 100 using a wavelength division multiplexing method according to an embodiment of the present invention includes a partial
The partial
Here, the partial
The optical fiber is easy to install in the field and is not affected by electromagnetic fields (EMI, EMF) of substation facilities. In particular, the optical fiber has no limitation on the length because there is no transmission loss, and even a very large substation, such as a 756 kV substation, can accommodate the whole with one line.
The signal processing /
When connecting the signal processing unit (DAU) to the partial discharge sensor, there is no distance restriction due to the loss of the coaxial cable. That is, since the signal processing unit DAU is conventionally connected to the partial discharge sensor through the coaxial cable, the signal processing unit DAU is disposed around the partial discharge sensor, and the management server is disposed in the central monitoring center. However, in the present invention, the signal processing unit (DAU) and the management server can be integrated into the signal processing /
FIG. 3 is a diagram illustrating a detailed configuration of the partial discharge monitoring system of FIG. 2, and FIG. 4 is a diagram illustrating an example of a wavelength spectrum of an optical signal transmitted through an optical fiber.
Referring to FIG. 3, the partial
The partial
At this time, the partial
Hereinafter, the partial
First, the partial
The partial
The
Here, the
Particularly, UHF method is a method of detecting the partial discharge detection signal of UHF band (300 MHz ~ 3,000 MHz) which receives relatively little external noise among the method of measuring partial discharge, , Now known as the most reliable way. Accordingly, the
The
The
Specifically, the plurality of individual devices 110-1 to 110-N do not allocate an arbitrary wavelength band to each optical signal through the commonly applied multiplexing
However, since most of the individual devices 110-1 to 110-N are disposed at a considerable distance in various positions of the electric power facility, the
Referring to FIG. 4, the wavelength band of the first PDE 110-1 is assigned 'λ1', the wavelength band of the second PDE 110-2 is assigned 'λ2' The wavelength band of the third partial discharge detection device 110-3 is allocated to '? 3', and the wavelength band of the Nth partial discharge detection device 110-N is allocated to? N '. In this way, each optical signal can be transmitted in the form of a wavelength spectrum through one optical fiber after being assigned a unique wavelength according to the WDM scheme. At this time, the signal processing /
Next, the signal processing /
The signal processing /
The
The
The
At this time, the
The
FIG. 5A is a diagram illustrating another embodiment of the partial discharge sensing apparatus of FIG. 3, and FIG. 5B is a diagram illustrating another embodiment of the signal conversion unit of FIG.
The partial
The
6 is a diagram showing redundancy of an optical cable (optical fiber) in the partial discharge monitoring system of FIG.
The partial
It will be apparent to those skilled in the art that various modifications and variations may be made in the present invention. Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
110: partial discharge sensor 111: partial discharge sensor
112: optical conversion unit 113: multiplexing unit
120: signal processing / analyzing apparatus 121: demultiplexing unit
122: signal conversion unit 123: signal processing unit
124: partial discharge analysis unit 125:
Claims (11)
And a signal processing / analysis apparatus for performing signal processing and analysis on the optical signal by demultiplexing the optical signal transmitted from each of the partial discharge detection apparatuses to the specific wavelength band allocated to the optical signal,
Each of the partial discharge sensing devices includes:
A partial discharge sensor for measuring the partial discharge detection signal;
A light conversion unit for converting the partial discharge detection signal into the optical signal; And
And a multiplexer for allocating the specific wavelength band to the optical signal and transmitting the optical signal by a wavelength division multiplexing method,
Wherein the signal processing / analysis device identifies each of the partial discharge sensing devices using the optical signal transmitted in the specific wavelength band.
Wherein the partial discharge sensing device and the signal processing /
Wavelength Division Multiplexing Partial Discharge Monitoring System interconnecting one or more optical cables (optical fibers).
The partial discharge detection signal may be generated by,
Wherein the abnormal signal and the normal signal of the power transmission facility are included in the partial discharge monitoring system.
Wherein the signal processing /
A demultiplexer for demultiplexing the multiplexed optical signal by the specific wavelength band allocated to the multiplexed optical signal;
A signal converter for converting the divided optical signal into a partial discharge detection signal and converting the divided optical signal into a digital electrical signal;
A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And
A partial discharge analyzer for analyzing the signal processed signal;
Wherein the wavelength division multiplexed partial discharge monitoring system comprises:
And a signal processing / analysis apparatus for performing signal processing and analysis on the optical signal by demultiplexing the optical signal transmitted from each of the partial discharge detection apparatuses to the specific wavelength band allocated to the optical signal,
Each of the partial discharge sensing devices includes:
A partial discharge sensor for measuring the partial discharge detection signal;
A digital converter for converting the partial discharge detection signal into a digital signal;
A light converter for converting the digital signal into an optical signal; And
And a multiplexer for allocating the specific wavelength band to the optical signal and transmitting the optical signal by the wavelength division multiplexing method,
Wherein the signal processing / analysis device identifies each of the partial discharge sensing devices using the optical signal transmitted in the specific wavelength band.
Wherein the signal processing /
A demultiplexer for dividing the multiplexed optical signal by wavelengths;
A signal converter for converting the divided optical signal into a digital electrical signal;
A signal processing unit for performing signal processing on the digital electric signal in a form suitable for signal analysis; And
A partial discharge analyzer for analyzing the signal processed signal;
Wherein the wavelength division multiplexed partial discharge monitoring system comprises:
The partial discharge sensor includes:
UHF sensor, VHF / HF sensor, and ultrasonic sensor.
Wherein the digital conversion unit comprises:
The partial discharge detection signal may be a digital signal according to one of a pulse code modulation (PCM), a pulse width modulation (PWM), and a quadrature amplitude modulation (QAM) Wavelength Division Multiplexing Partial Discharge Monitoring System.
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KR1020170033322A KR101904648B1 (en) | 2017-03-16 | 2017-03-16 | Wavelength division multiplexing system for detecting partial discharge |
PCT/KR2017/008458 WO2018169141A1 (en) | 2017-03-16 | 2017-08-04 | Wavelength division multiplexing partial discharge monitoring system |
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KR102039837B1 (en) * | 2018-10-12 | 2019-11-01 | 한국전력공사 | Partial discharge sensor including optical converter and partial discharge detection system including the same |
CN110470960B (en) * | 2019-09-05 | 2021-03-09 | 国网北京市电力公司 | Cable partial discharge analysis method and device, storage medium and processor |
CN110514974B (en) * | 2019-10-14 | 2021-05-04 | 云南电网有限责任公司电力科学研究院 | Partial discharge positioning system and method |
CN113899995A (en) * | 2021-09-30 | 2022-01-07 | 哈尔滨理工大学 | Partial discharge detection method and device based on distributed feedback fiber laser |
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WO2012008929A1 (en) * | 2010-07-16 | 2012-01-19 | Agency For Science, Technology And Research | Sensor and method of manufacturing the same, and system for detecting a partial discharge signal and a method of forming the same |
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KR100722736B1 (en) * | 2005-08-12 | 2007-05-30 | 연세대학교 산학협력단 | Wavelength Division Multiplexed Passive Optical Network System |
EP2213020A4 (en) * | 2007-10-25 | 2013-03-27 | Battelle Memorial Institute | Optical-to-millimeter wave conversion |
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