KR101904648B1 - Wavelength division multiplexing system for detecting partial discharge - Google Patents

Wavelength division multiplexing system for detecting partial discharge Download PDF

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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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signal
partial discharge
optical
optical signal
signal processing
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KR1020170033322A
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Korean (ko)
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KR20180105954A (en
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박기준
구선근
주형준
유승덕
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한국전력공사
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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
    • 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
    • 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
    • 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

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.

Figure R1020170033322

Description

[0001] WAVELENGTH DIVISION MULTIPLEXING SYSTEM FOR DETECTING PARTIAL DISCHARGE [0002]

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 partial discharge sensor 10, a data acquisition unit (DAU) 20, and a control server 30. The partial discharge sensor 10 and the signal processing apparatus 20 are connected to a high frequency low loss type coaxial cable and the signal processing apparatus 20 and the control server 30 are connected to each other through an Ethernet or a dedicated line It is connected by optical cable.

The coaxial cable connecting the partial discharge sensor 10 and the signal processor 20 has a limited length. This is because the transmission loss is generated in the UHF band of the coaxial cable, so that the distance between the partial discharge sensor 10 and the signal processing device 20 should be limited within the transmission loss tolerance range of the coaxial cable. The plurality of partial discharge sensors 10 are installed at 10 to 20 m intervals in a substation such as a GIS or a transformer. Thus, the partial discharge sensor 10 and the signal processor 20 have a limitation in that they are located at a close distance due to the signal attenuation of the coaxial cable.

Conventionally, three to six partial discharge sensors 10 and the signal processor 20 are connected using a coaxial cable within 15 m. Thus, in order to connect the signal processing apparatus 20 to all the partial discharge sensors 10 by using a coaxial cable, a predetermined number (i.e., three to six) of the partial discharge sensors 10 are grouped into one group Management. That is, since a plurality of groups including a predetermined number of partial discharge sensors 10 are formed, the signal processing apparatuses 20 are also arranged for each group, so that a plurality of groups should be provided.

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 partial discharge sensor 10 to the signal processing device 20, it involves material cost and installation cost. Due to the limitation of the distance of the coaxial cable, three to six partial discharge sensors A plurality of signal processing apparatuses 20 connected to a plurality of signal processing apparatuses 10 need to be installed.

The signal processing apparatus 20 installed in various places of the substation is connected to the control server 30 through an optical cable such as a dedicated line. In this conventional method, since a plurality of signal processing apparatuses 20 are installed in various places, the manufacturing cost and the installation cost can be increased as the area of the substation and the number of the partial discharge sensors 10 are increased.

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.

Japanese Patent Application Laid-Open No. 1999-287838 Japanese Patent No. 5,414,413 (registered on November 22, 2013)

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 discharge detection device 110, And a processing / analysis apparatus 120.

The partial discharge detection device 110 measures a partial discharge signal (hereinafter, referred to as a partial discharge detection signal) in the form of a pulse and transmits it to the signal processing / analysis device 120 as a sensing device for sensing a partial discharge of the substation , The signal processing / analysis apparatus 120 performs signal processing and analysis on the partial discharge detection signal transmitted from the partial discharge detection apparatus 110 to monitor the partial discharge. At this time, the partial discharge detection signal is a signal measured for the partial discharge monitoring of the substation, and the abnormal signal of the substation (that is, the partial discharge is generated) and the normal signal (that is, .

Here, the partial discharge sensing device 110 and the signal processing / analyzing device 120 are connected to each other through an optical fiber (optical fiber), and transmit and receive signals using Wavelength Division Multiplexing (WDM).

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 / analyzing apparatus 120 is connected to the partial discharge detecting apparatus 110 using a single optical fiber (optical fiber), while the partial discharge detecting apparatus 110 is installed at various points in the substation, And the wavelength division multiplexing system, the functions of the signal processing unit (DAU) installed in various places of the substation can be integrated into one configuration due to the distance restriction due to the loss of the signal line.

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 / analyzing apparatus 120, which is a single component, and concentrated in the central monitoring center.

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 discharge monitoring system 100 includes a partial discharge sensing device 110 and a signal processing / analyzing device 120.

The partial discharge sensing device 110 and the signal processing / analyzing device 120 are connected to each other through an optical fiber (optical fiber) to perform optical communication. Therefore, an electric signal representing information is converted into an optical signal, And converts the optical signal into an electrical signal to reproduce desired information.

At this time, the partial discharge sensing device 110 and the signal processing / analyzing device 120 use a wavelength division multiplexing method. That is, each of the partial discharge detection devices 110 functions as a transmitter for transmitting an optical signal having a predetermined wavelength, and the signal processing / analysis apparatus 120 functions as a receiver for receiving and dividing the received optical signal . Accordingly, the partial discharge sensing apparatus 110 is provided with a multiplexer (MUX) function and the signal processing / analysis apparatus 120 is provided with a demultiplexer (De-MUX) function.

Hereinafter, the partial discharge detection device 110 and the signal processing / analysis device 120 will be described in detail.

First, the partial discharge sensing device 110 is installed at a plurality of points of the substation facility with a plurality of discrete devices 110-1 to 110-N. Here, for convenience, the plurality of individual devices 110-1 to 110-N will be collectively referred to as the partial discharge detection device 110. [

The partial discharge sensing apparatus 110 includes a partial discharge sensor 111, a light conversion unit 112, and a multiplexing unit 113. Here, the partial discharge sensor 111, the photo-conversion unit 112, and the multiplexing unit 113 are collectively included in the plurality of individual devices 110-1 to 110-N.

The partial discharge sensor 111 measures a partial discharge detection signal, that is, a partial discharge detection signal, for the substation facility (e.g., GIS, etc.).

Here, the partial discharge sensor 111 can measure the partial discharge detection signal using, for example, a UHF method, a VHF / HF method, an ultrasonic method, or the like. That is, the partial discharge sensor 111 may be a UHF sensor, a VHF / HF sensor, or an ultrasonic sensor.

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 partial discharge sensor 111 may be a UHF sensor when the partial discharge detection signal is measured using the UHF method. In this case, the UHF sensor can select and use a certain band at a frequency between 300 MHz and 2,500 MHz in consideration of the influence of external noise, the structure of the object to be measured, and the transfer characteristics of the partial discharge detection signal. In order to measure the partial discharge detection signal, a partial discharge sensor 111 is built in for the internal measurement of the substation, or a spacer (not shown) installed for the purpose of supporting the gas partition of the GIS and the conductor for external measurement of the substation spacer can be measured by attaching the partial discharge sensor 111.

The light conversion unit 112 converts the partial discharge detection signal measured by the partial discharge sensor 111 into an optical signal. That is, the optical conversion unit 112 corresponds to an electrical to optical converter (E / O converter) that converts an electrical signal into an optical signal. The light conversion unit 112 is provided with a conversion element such as a semiconductor laser (PN junction diode) or an infrared LED.

The multiplexing unit 113 multiplexes the optical signal converted by the optical conversion unit 112 into a plurality of wavelength bands by dividing the entire optical fiber wavelength band (for example, the optical fiber low-loss wavelength band 1550 nm band) And allocates a specific wavelength band to the optical signal input from the post-optical conversion unit 112. [ In other words, the multiplexing unit 113 converts a source of the optical signal transmitted from the optical conversion unit 112 into a specific optical signal that can be confirmed.

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 unit 113, And assigns a specific wavelength band to each optical signal through the optical fiber 113. That is, the plurality of individual devices 110-1 to 110-N transmit optical signals having respective intrinsic wavelengths to the optical fibers, and the signal processing / analysis apparatus 120 identifies the wavelengths of the optical signals, The devices 110-1 to 110-N can be distinguished.

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 multiplexing unit 113 includes a plurality of individual devices 110-1 to 110- As shown in Fig.

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 / analysis apparatus 120 can identify the partial discharge sensing apparatus 110 by discriminating the wavelength of the optical signal.

Next, the signal processing / analysis apparatus 120 monitors whether a partial discharge occurs in the substation using the optical signal transmitted from the partial discharge detection apparatus 110. [

The signal processing / analyzing apparatus 120 includes a demultiplexing unit 121, a signal converting unit 122, a signal processing unit 123, a partial discharge analyzing unit 124, and a storage unit 125.

The demultiplexer 121 separates the 'multiplexed optical signal' transmitted through one optical fiber. That is, the demultiplexer 121 demultiplexes the 'multiplexed optical signal' for each wavelength. In FIG. 4, the multiplexed optical signal '? 1 +? 2 +? 3 + + ΛN 'is the optical signal' λ1 ', the optical signal' λ2 ', the optical signal' λ3 ', ... , And the optical signal '? N'.

The signal conversion unit 122 restores the optical signals separated by the demultiplexing unit 121 into partial discharge detection signals (i.e., electrical signals). In this case, the signal conversion unit 122 may include an optical to electrical converter (O / E converter) that restores the optical signal to a partial discharge detection signal, and a converted partial discharge detection signal To-analog converter (A / D converter). The signal converting unit 122 may include a conversion device such as a photo diode or a photo transistor to convert an optical signal into an electrical signal. The signal conversion unit 122 stores the restored partial discharge detection signal in the storage unit 125 after analog-to-digital conversion.

The signal processing unit 123 performs a signal processing process for changing the electric signal output from the signal converting unit 122 into a form suitable for signal analysis. The signal processing unit 123 performs a signal processing process for changing the unprocessed electrical signal (partial discharge signal) output from the signal converting unit 122 into a form suitable for analyzing the partial discharge signal of the power device. That is, the signal processor 123 converts the electrical partial discharge signal into an analog-to-digital converted signal to facilitate the signal analysis and visualization. The signal processor 123 converts the voltage and phase of the voltage to be monitored, Can be converted.

At this time, the signal processing unit 123 stores the result of the signal processing process in the storage unit 125 for each of the partial discharge sensors 111 of the partial discharge detection apparatus 110.

The partial discharge analyzer 124 analyzes the signal processed by the partial discharge sensors 111 of the partial discharge detector 110. At this time, the partial discharge analyzer 124 can perform analysis such as the presence or absence of the partial discharge, the position estimation using the arrival time difference of the partial discharge detection signal, and the discharge power estimation according to the classification of the partial discharge detection signal. The partial discharge analysis unit 124 outputs the analysis result through a display unit (not shown) and provides the result to the user or the storage unit 125.

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 discharge sensing apparatus 110a of FIG. 5A performs a digital conversion on the partial discharge detection signal and then performs the light conversion. That is, the partial discharge detection signal measured by the partial discharge sensor 111a is converted into a digital signal by the digital conversion unit 114 and then optically converted through the light conversion unit 112a. Here, the digital converter 114 converts the partial discharge detection signal measured by the partial discharge sensor 111a into pulse code modulation (PCM), pulse width modulation (PWM), quadrature amplitude (Quadrature Amplitude Modulation) method according to the present invention.

The signal converter 122a of FIG. 5B demodulates each optical signal into a digital signal for each wavelength when the optical signal is received from the PD detection device 110a of FIG. 5A. At this time, the signal converting unit 122a may use any one of a pulse code modulation (PCM), a pulse width modulation (PWM), and a quadrature amplitude modulation (QAM) do.

6 is a diagram showing redundancy of an optical cable (optical fiber) in the partial discharge monitoring system of FIG.

The partial discharge sensing apparatus 100 and the signal processing / analysis apparatus 120 can form a redundant path when they are connected to each other through an optical fiber (optical fiber). Such a redundant path can secure the reliability and stability of signal transmission by securing another line when there is a physical defect in one of the lines, a disconnection due to an external influence, or a failure. Accordingly, the partial discharge sensing apparatus 100 and the signal processing / analysis apparatus 120 can further constitute a second optical fiber (second optical fiber) as well as a first optical cable (first optical fiber). Here, the first optical fiber (first optical fiber) may be used as a main line, and the second optical cable (second optical fiber) may be used as a spare line. The second optical fiber (second optical fiber) is transferred to the main line when there is an abnormality in the first optical cable (first optical fiber).

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)

In order to monitor a partial discharge of a substation, a measured partial discharge detection signal is generated as an optical signal through photo-conversion, and then the optical signal is allocated to a specific wavelength band divided in the entire optical fiber wavelength band and transmitted through a wavelength division multiplexing A plurality of partial discharge detection devices And
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.
The method according to claim 1,
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 method according to claim 1,
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.
delete The method according to claim 1,
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:
delete In order to monitor a partial discharge of a substation, a measured partial discharge detection signal is generated as an optical signal through photo-conversion, and then the optical signal is allocated to a specific wavelength band divided in the entire optical fiber wavelength band and transmitted through a wavelength division multiplexing A plurality of partial discharge detection devices And
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.
8. The method of claim 7,
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:
delete 8. The method of claim 1 or 7,
The partial discharge sensor includes:
UHF sensor, VHF / HF sensor, and ultrasonic sensor.
8. The method of claim 7,
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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