KR101012490B1 - Remote-monitoring system of partial discharge for a cable connecting device - Google Patents

Abstract

The present invention relates to a cable connection member partial discharge monitoring system configured to monitor in real time a cable connection member installed for cable connection to a gas insulated switchgear of a substation.
Partial discharge monitoring system of the cable connection member according to the present invention is installed on the outer periphery of the cable connection member for connecting the gas insulation switchgear (GIS) and the distribution cable installed in the indoor substation, the partial discharge detection sensor for detecting the change value of the capacitance Detecting unit including the, the capacitance value of each of the cable connection member transmitted from the partial discharge detection sensor is converted into a partial discharge value, by comparing with the predetermined abnormal partial discharge value to determine the internal failure of the cable connection member, or failure It is installed at a partial discharge measuring device and a remote site so as to anticipate the current, and receives a partial discharge value from the partial discharge measuring device through a data communication network to perform real time monitoring, and a partial discharge value above a preset value is applied. If it is a case, it generates a warning, and the manager to control the opening and closing of the breaker installed at the front of the bus. It includes a terminal.

Description

Cable connection material partial discharge monitoring system {REMOTE-MONITORING SYSTEM OF PARTIAL DISCHARGE FOR A CABLE CONNECTING DEVICE}

The present invention relates to a cable connection member partial discharge monitoring system of an indoor substation, and more particularly, to a cable connection member partial discharge monitoring system configured to monitor in real time a cable connection member installed for cable connection to a gas insulated switchgear of a substation.

Recently, due to the development of information and communication technology, the development of information providing technology that provides real-time information to various subscribers through at least one host server through a remote data communication network is actively underway.

Based on this, recently, information technology and compression technology are being developed to provide more convenient access to neighboring technologies such as cache memory expansion technology to provide accurate information to subscribers more quickly and subscribers' tastes and preferences. It is also accelerating the development of various contents and its solutions.

On the other hand, as most of the switching facilities of power plants and substations are constructed with gas insulated switchgear (GIS), the number of facilities of this gas insulated switchgear (GIS) has greatly increased, and the proportion of the distribution line system is also increasing. Increasingly, the failure of the gas insulated switchgear (GIS) not only causes power supply problems but also takes a long time to return.

Gas Insulated Switchgear (GIS) is a device that protects the system by switching the load in the transmission / transmission system or electric circuit or cutting off the current in case of an accident such as grounding or short circuit, and is filled with sulfur hexafluoride (SF6) insulation gas. It is a switchgear with built-in switchgear and busbar such as disconnector, ground switch and breaker in the steel container.

However, the device has a partial discharge (PD) due to loosening of the internal bolts, the presence of metal foreign matters, and the generation of internal voids in the space, and the partial discharge gradually increases, so that the gas insulated switchgear (GIS) Breaking the insulation will cause breakdown, one of the serious accidents of power devices (substations).

In particular, a well-known cable connecting member for connecting a gas insulated switchgear (GIS) and a distribution cable of an indoor substation does not have a regular test and measurement, such that the factor of failure occurs constantly.

In addition, there is no system for preventing the failure of the gas insulation switchgear (GIS) in which the cable connection member is installed and is exposed to the risk of failure.

Therefore, the technical problem of the present invention is to determine the possibility of failure through the partial discharge measuring device to the signal acquired through the partial discharge detection sensor, and to transmit the detection signal to the remote administrator terminal real-time monitoring and prevention of the cable connection part discharge To provide a surveillance system.

In order to achieve the above technical problem, the cable connection member partial discharge monitoring system of the present invention is installed on the outer periphery of the cable connection member for connecting a gas insulation switchgear (GIS) installed in an indoor substation and a distribution cable to detect a change in capacitance. A detection unit including a partial discharge detection sensor; By receiving the capacitance value of each cable connection member transmitted from the partial discharge detection sensor converted into a partial discharge value, and compared with a predetermined abnormal partial discharge value to determine the internal failure of the cable connection member or to predict the failure Partial discharge measuring device; And it is installed in the remote place, and receives the partial discharge value from the partial discharge measurement device through the data communication network to monitor in real time, and if a partial discharge value of more than the predetermined value is applied, generates a warning, and at the front of the bus It includes an administrator terminal for controlling the opening and closing of the installed circuit breaker.

The detection unit may further include a band filter for removing noise by filtering a predetermined band by receiving the capacitance signal value detected by the partial discharge detection sensor inside the detection unit.

The partial discharge detection sensor is configured in a flexible band form, a plurality of coils therein may be formed to be wound around the outer periphery of the cable connection member.

In the partial discharge measuring apparatus, a plurality of connection channels receive a partial discharge signal from the plurality of partial discharge detection sensors.

In the manager terminal, a plurality of warning display means may be formed as a display screen or a light emitting diode (LED) to indicate the degree of partial discharge.

The partial discharge measuring device includes a band filter for preventing the inflow of the surge voltage by removing noise for signals other than a predetermined band; A data receiver for receiving a capacitance value applied from the band pass filter; A partial discharge value conversion unit for converting the capacitance value received from each partial discharge detection sensor through the data receiver into a partial discharge value; A phase detector which detects the phase distribution of the partial discharge signal by receiving the partial discharge value converted through the partial discharge value converting unit and detects the magnitude (QMAX) of the partial discharge value and the energy amount (PDI) value of the partial discharge value; A pulse counter that detects a frequency of occurrence of partial discharge per second (PPS) by detecting a periodic distribution of the partial discharge signal by receiving the partial discharge value converted through the partial discharge value converting unit; A display unit for displaying the partial discharge data of the partial discharge occurrence frequency (PPC) per cycle through seven segments; A display driver for driving the display unit; A data transmission unit for transmitting the partial discharge data to a remote manager terminal through a data communication network; Corresponding data values of the capacitance value and the partial discharge value are stored, the position information of the partial discharge detection sensor for each channel to which the partial discharge detection sensor is connected is stored, and the reference set value at the time of warning driving is stored. Memory; And converting the capacitance value received from the partial discharge detection sensor into a partial discharge value, and detecting a phase distribution and a periodic distribution of the partial discharge signal from the converted value to predict whether or not a failure occurs and to drive an alarm. It may be configured as a control unit.

The manager terminal includes a communication module for receiving the phase distribution and the period distribution data of the partial discharge data and the partial discharge signal for each time zone transmitted from the partial discharge measurement apparatus inside the manager terminal, and transmits a cutoff signal to a power breaker; A power circuit breaker opening / closing operation unit for inputting an open / close control signal of a power circuit breaker by a manager in determining a fault or predicting a fault according to a comparison of phase distribution data and period distribution data of the partial discharge signal; A partial discharge value graphic converting unit for changing and processing the graphic data for each partial discharge measurement device for each partial discharge measurement device, for each partial discharge measurement device, the phase discharge data and the phase distribution data of the partial discharge signal transmitted from the partial discharge measurement device; A display unit for outputting a phase distribution and a period distribution data of the partial discharge signal changed into graphic data through the partial discharge value graphic conversion unit on a screen and displaying a failure or failure prediction signal due to comparison with a preset value; A warning generator configured to display and drive the warning signal when the failure signal is generated, or to generate a failure or failure warning sound through a separate buzzer or speaker; A memory for storing graphic data for converting the phase distribution signal and the periodic distribution data of the partial discharge signal into graphic data, position information of each partial discharge measurement device, breaking history information of a power breaker, and alarm generation history information; And a controller for outputting the phase distribution and the periodic distribution data of the partial discharge signal to a screen and determining whether the failure or the possibility of failure occurs due to comparison with a preset value, and controlling to generate a warning when an abnormal condition occurs. .

The manager terminal further includes an automatic power cut-off unit for automatically cutting off power transmitted to the bus by receiving a cutoff control signal from the controller to protect the bus when the controller determines a failure or a possibility of failure in the manager terminal. can do.

In order to achieve the above technical problem, the cable connection member partial discharge monitoring method of the present invention comprises: setting a warning set value in the partial discharge measuring apparatus; Receiving a detection signal from the partial discharge detection sensor and storing the detected signal in a memory; Receiving a capacitance value from the partial discharge detection sensor and converting the partial discharge value into a partial discharge value in the partial discharge measuring device; Detecting a phase distribution and a periodic distribution of the partial discharge value through the partial discharge value; Comparing the warning set value and the partial discharge value; Detecting an abnormal state by comparing the warning set value and the partial discharge value; Counting a partial discharge state when the abnormal state is detected; Determining a degree of the partial discharge state and generating a warning; Displaying a partial discharge generation position and an extraction value; Receiving a block signal; And operating a cutoff switch when the cutoff signal is received.

In the receiving of the detection signal from the partial discharge detection sensor and storing in the memory, the reception of the detection signal is applied to the capacitance signal value detected from the partial discharge monitoring sensor in the detection unit by filtering a predetermined band to remove noise It may include the step.

In the detecting of the phase distribution and the periodic distribution of the partial discharge value, the phase distribution and the periodic distribution may include the magnitude of the partial discharge value (QMAX), the amount of energy of the partial discharge value (PDI), and the frequency of partial discharge per second (PPS). ) And PPC values per cycle.

The detecting of the abnormal state may further include comparing the warning set value and the partial discharge value if the abnormal state is not detected.

In the blocking signal receiving step, if the blocking signal is not received, it is preferable to feed back to the blocking signal receiving step.

In order to achieve the above technical problem, the cable connection member partial point monitoring method of the present invention comprises the steps of setting a warning set value in the partial discharge measuring device; Receiving a detection signal from the partial discharge detection sensor and storing the detected signal in a memory; Receiving a capacitance value from the partial discharge detection sensor and converting the partial discharge value into a partial discharge value in the partial discharge measuring device; Detecting a phase distribution and a periodic distribution of the partial discharge value through the partial discharge value; Comparing the warning set value and the partial discharge value; Detecting an abnormal state by comparing the warning set value and the partial discharge value; Counting a partial discharge state when the abnormal state is detected; Determining a degree of the partial discharge state and generating a warning; Displaying a partial discharge generation position and an extraction value; Receiving a block signal; And automatically operating a disconnect switch.

In the receiving of the detection signal from the partial discharge detection sensor and storing in the memory, the reception of the detection signal is applied to the capacitance signal value detected from the partial discharge monitoring sensor in the detection unit by filtering a predetermined band to remove noise It may include the step.

In the detecting of the phase distribution and the periodic distribution of the partial discharge value, the phase distribution and the periodic distribution may include the magnitude of the partial discharge value (QMAX), the amount of energy of the partial discharge value (PDI), and the frequency of partial discharge per second (PPS). ) And through the calculation of the PPC value per cycle.

The detecting of the abnormal state may further include comparing the warning set value and the partial discharge value if the abnormal state is not detected.

As described above, the cable connection member partial discharge monitoring system of the indoor substation according to the present invention is a partial discharge detection sensor on the outer periphery of the cable connection member to detect a partial discharge of the cable connection member substantially leading to burnout of the peripheral pressure of the bus. It is possible to prevent the expansion of the fault range early due to partial discharge by installing an alarm and generating an alarm signal through real-time monitoring at a remote manager terminal and automatic comparison with the fault setting value.

1 is a view schematically showing the overall configuration of a cable connection member partial discharge monitoring system according to an embodiment of the present invention.
2 is a block diagram showing the configuration of a partial discharge measuring device included in a cable discharge member partial discharge monitoring system according to an embodiment of the present invention.
3 is a block diagram showing the configuration of an administrator terminal according to an embodiment of the present invention.
4 is a view showing a partial discharge display screen of the manager terminal according to an embodiment of the present invention.
5 is a flowchart illustrating a monitoring method of the cable connection member partial discharge monitoring system according to the first embodiment of the present invention.
6 is a flowchart illustrating a monitoring method of the cable connection member partial discharge monitoring system according to a second embodiment of the present invention.

Hereinafter, the same reference numerals will be described in detail with reference to the accompanying drawings, with reference to the same components preferred embodiments of the present invention. The terms or words used in the specification and claims are not to be construed as being limited to conventional or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical matters of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6.

1 is a view schematically showing the overall configuration of a cable connection member partial discharge monitoring system according to an embodiment of the present invention. Referring to FIG. 1, the cable connection member partial discharge monitoring system includes a partial discharge detecting sensor 2, a partial discharge measuring device 8, and an administrator terminal 10.

In the cable connection member partial discharge monitoring system according to an embodiment of the present invention, a partial discharge detection sensor (2) is attached to the outer surface of a cable connection member installed for cable connection to a gas insulated switchgear (GIS) of a substation and the power failure of the cable connection member Capacitance value (specifically, change in capacitance) is converted into a partial discharge value and partial discharge data is generated to determine a possibility of failure through a plurality of partial discharge measuring devices 8, and the partial discharge data is stored in a remote manager terminal. Partial discharge monitoring system for cable connection materials that can be sent to (10) to enable real-time monitoring and prevention, and to display the partial discharge status step by step according to the degree of the possibility of failure, so that even an inexperienced manager can take prompt action. to be.

In addition, a cable that monitors a plurality of cable connection members in real time, and when the abnormal signal occurs, the administrator terminal 10 automatically shuts off the circuit breaker of the gas insulation switchgear (GIS) and generates an alarm to prevent the spread of failure to the bus Connection material partial discharge monitoring system.

To this end, the cable connection member partial discharge monitoring system according to an embodiment of the present invention is installed on the outer periphery of the various types of cable connection member for connecting the gas insulation switchgear (GIS) installed in the indoor substation and the distribution cable capacitance value Partial Discharge Detection (PD) (2) is provided for detecting, and the band filter for removing noise by filtering a predetermined band by receiving the capacitance value detected from the Partial Discharge Detection Sensor (2) And a sensing unit 6 having 4. Here, the partial discharge detection sensor 2, the band pass filter 4 and the detection unit 6 may be provided in plurality.

At this time, the partial discharge sensor (2) is configured in the form of a flexible band different from the existing sensors, a plurality of coils are installed inside the winding around the outer periphery of the cable connecting member, the capacitance of the cable connecting member It is a sensor that can detect.

In addition, the cable connection member partial discharge monitoring system according to an embodiment of the present invention receives the capacitance value of each cable connection member transmitted from the plurality of partial discharge detection sensor 2 is converted into a partial discharge value to convert the partial discharge data And a partial discharge measuring device 8 which generates and compares the partial discharge data value with a predetermined failure value to determine the internal failure of the cable connection member or to predict the failure. Here, the partial discharge measuring device 8 may be provided in plurality.

That is, when partial discharge (PD) is generated in the cable connection material for connecting the gas insulation switchgear (GIS) and the distribution cable, the partial discharge proceeds gradually for a predetermined time. Therefore, the system of the present invention can prevent the burnout of the bus by detecting the initial state of the partial discharge occurring in the cable connecting member and preventing the burning of the cable connecting member in advance.

In this case, since the partial discharge measuring device 8 is provided with a plurality of connection channels, any one of the partial discharge measuring devices 8 can receive a capacitance value from the plurality of partial discharge detection sensors 2 and thus economically. It is also advantageous and easy to install. Preferably, it may be formed of 15 or more connection channels and the partial discharge detection sensor (2).

In addition, the cable connection member partial discharge monitoring system is installed at a remote location, receives the partial discharge data from a plurality of partial discharge measuring devices 8 through a data communication network to perform monitoring in real time, the failure of the partial discharge data value is preset If the value is greater than or equal to the warning, and includes a manager terminal 10 for controlling the opening and closing of the breaker (not shown) installed in the front of the bus.

The partial discharge data includes the magnitude (QMAX) of the partial discharge, the amount of energy (PDI) of the partial discharge, and the partial discharge occurrence frequency (partial discharge occurrence frequency (PPS) per second) and the partial discharge occurrence frequency (PPC) per cycle. It is composed of three elements, etc. Preferably, it is possible to store a predetermined failure value for the three elements. Therefore, if any one of the above three factors is determined, it is determined as the minimum required condition for precision diagnosis, and one light emitting diode (LED) is driven. In the case of driving the light emitting diodes (LEDs) and all three elements, it is preferable to drive the three warning light emitting diodes (LEDs) so that the partial discharge state can be displayed for each level.

In this case, the warning display is not limited to the display through the light emitting diodes (LEDs), but it is also possible to generate the warnings through the monitor of the manager terminal 10.

Meanwhile, the manager terminal 10 may automatically switch a breaker (not shown) according to the partial discharge value converted from the capacitance value transmitted from the partial discharge detection sensor 2 to protect equipment such as a transformer of a bus. It is possible to make it possible.

FIG. 2 is a block diagram showing in detail the configuration of the partial discharge measuring apparatus 8 of FIG. Referring to FIG. 2, the partial discharge measuring apparatus 8 includes a bandpass filter 82, a data receiver 84, a partial discharge converter 86, a phase detector 88, and a pulse counter 90.

The partial discharge measuring device 8 is provided with a bandpass filter 82 for preventing the influx of surge voltage by removing noise for a signal other than a predetermined band from the capacitance value received from the partial discharge detecting sensor 2. And converting the capacitance value received from each partial discharge detection sensor 2 through the data receiver 84 and the data receiver 84 for receiving the capacitance value applied from the band pass filter 82 into a partial discharge value. It includes a partial discharge value conversion unit 86 for.

In addition, the partial discharge value converted through the partial discharge value converting unit 86 is applied to detect a phase distribution of the partial discharge signal to detect the magnitude of the partial discharge (QMAX), the energy amount of the partial discharge (PDI), and the portion per cycle. Generation of partial discharge per second by detecting the periodic distribution of the partial discharge signal by receiving the partial discharge value converted through the phase detection unit 88 and the partial discharge value conversion unit 86 to detect the discharge occurrence frequency (PPC) value. And a pulse counter 90 for detecting a frequency (PPS) value.

In addition, the partial discharge measuring device 8 is provided with a display unit 92 for displaying the partial discharge value through the seven segments and the like, and a display driver 94 for driving the display unit 92 is provided. And a data transmission unit 96 for transmitting the partial discharge data to the remote manager terminal 10 through the data communication network.

On the other hand, the partial discharge measuring device 8 stores therein the corresponding partial discharge value converted into a capacitance value therein, and the partial discharge detection sensor 2 for each channel to which the partial discharge detection sensor 2 is connected. Location information is stored and the fault value, which is the reference for warning driving, is stored in the memory 98 and the capacitance value received from each partial discharge detection sensor 2 is converted into a partial discharge value, and the partial discharge value is converted from the converted value. The control unit 100 detects the phase distribution and the periodic distribution of the signal and predicts the failure or the possibility of the failure, and controls to drive the alarm.

3 is a block diagram showing the configuration of an administrator terminal according to an embodiment of the present invention.

Referring to FIG. 3, the manager terminal 10 according to an exemplary embodiment of the present invention may include partial discharge data (phase distribution and period of partial discharge values) according to time slots transmitted from the plurality of partial discharge measuring devices 8 therein. Communication module 102 for transmitting the cutoff signal to a power breaker (not shown), comparing the phase distribution and the periodic distribution data of the partial discharge values, and determining the failure or predicting the failure. Changing and processing the partial discharge data for each time zone and the time zone partial graphic data transmitted from the partial breaker measurement device and the power breaker opening and closing operation unit 104 for the administrator to input the open / close control signal of the power breaker. And a partial discharge value graphic converting unit 106.

In addition, the manager terminal 10 outputs the phase distribution and periodic distribution data of the partial discharge value changed and processed into graphic data through the partial discharge value graphic conversion unit 106 therein, and displays a preset fault value and A display unit 108 for displaying a failure signal (including a failure prediction signal) in comparison with the display, driving a corresponding warning signal when a failure signal is displayed on the display unit 108, or by a separate buzzer or speaker It includes a warning generating unit 110 for generating a failure or failure warning sound through (not shown).

On the other hand, the manager terminal 10 is a graphic data for changing the phase distribution and periodic distribution data of the partial discharge value to the graphic data therein, the position information of each PD measuring device, the breaking history information of the power circuit breaker, the alarm generation Memory 114 for storing the history information, phase distribution and periodic distribution data of the partial discharge value on the screen and compares with the preset failure value to determine whether the failure or the possibility of failure to generate an alarm when an abnormal condition occurs The control unit 116 is included.

Preferably, the manager terminal 10 receives the cutoff control signal from the control unit 116 to protect the bus when the failure determination or the possibility of failure of the control unit 116 therein automatically receives power transmitted to the bus. The automatic power cut-off unit 112 is further configured to cut off the power supply, and the control unit 116 outputs the phase distribution and the period distribution data of the partial discharge value on the screen and compares it with a preset failure value at a time when the probability of failure is high. By allowing the automatic power cut-off unit 112 to be automatically cut off, it is possible to automatically protect the bus or peripheral pressure even in the absence of a manager.

In addition, the control unit 116 is a block condition of the automatic power cut-off unit 112, the magnitude of the partial discharge (QMAX) detected by the analysis of the partial discharge value, the amount of energy (PDI) of the partial discharge, and the partial discharge When more than a predetermined number of three factors, including occurrence frequency (including partial discharge frequency per second (PPS) and periodic partial discharge frequency (PPC) per cycle), exceed the preset value, the automatic power cut-off unit 112 automatically Can be set to switch to

4 is a view showing a partial discharge display screen of the manager terminal according to an embodiment of the present invention.

Partial discharge display screen 12 of the manager terminal according to an embodiment of the present invention, as shown in Figure 4, the position code display unit 14 for outputting the code information for each position of the partial discharge measuring device 8, Output parts 16, 18, 20, which display the magnitude of the partial discharge (QMAX), the amount of energy of the partial discharge (PDI), the frequency of partial discharge per second (PPS) and the partial discharge occurrence frequency (PPC) per cycle, respectively. 22) the magnitude of the partial discharge (QMAX), the amount of energy of the partial discharge (PDI), the frequency of occurrence of the partial discharge per second (PPS) and the portion per cycle, which are output through the outputs 16, 18, 20, and 22; And a partial discharge warning state display unit 24 for displaying a warning state of the partial discharge in accordance with the magnitude information of the discharge occurrence frequency PPC value. Here, the partial discharge warning state display unit 24 is at an abnormal level of the magnitude of the partial discharge (QMAX), the amount of energy of the partial discharge (PDI), the occurrence frequency of the partial discharge per second (PPS) and the partial discharge occurrence frequency (PPC) per cycle. There is provided a warning light 26 indicating three warning conditions. That is, when all of the warning lights 24 are lit, it can be said to be a warning state to protect the peripheral pressure of the bus by switching the power breaker immediately.

5 is a flowchart illustrating a monitoring method of the cable connection member partial discharge monitoring system according to the first embodiment of the present invention.

Referring to Figure 5, the monitoring method of the cable connection member partial discharge monitoring system according to the first embodiment of the present invention is a warning set value setting step (S100), the detection signal receiving and storing step (S110), the step of converting into a partial discharge value (S120), phase distribution and period distribution detection step (S130), comparison step (S140), abnormal state detection step (S150), count step (S160), warning generation step (S170), display step (S180), blocking signal Receiving step (S190) and the cutoff switch comprises an operation step (S192).

First, a warning set value is set in a partial discharge measuring device for generating an alarm by receiving a capacitance value from a plurality of partial discharge detection sensors.

When the partial discharge measuring device receives the capacitance value from the partial discharge detecting sensor, the capacitance value is converted into the partial discharge value by using the previously stored matching data, and the partial discharge measuring device uses the partial discharge value. The magnitude (QMAX) of the partial discharge value, the amount of energy (PDI) of the partial discharge value, the occurrence frequency (PPS) of the partial discharges per second and the partial discharge occurrence frequency (PPC) per cycle are calculated. That is, the phase distribution and the periodic distribution of the partial discharge value are detected.

Subsequently, the partial discharge measuring apparatus includes a preset failure set value and the magnitude of the detected partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the frequency of occurrence of partial discharge per second (PPS) and the occurrence of partial discharge per cycle. Compare the frequency (PPC) values, and simultaneously measure the magnitude of the partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the frequency of occurrence of partial discharges per second (PPS) and the frequency of partial discharges per cycle (PPC). Send to remote administrator's terminal.

Next, the partial discharge measuring apparatus and the manager terminal determines whether the partial discharge state of the cable connection member is abnormal through data comparison. In other words, it is determined whether a failure is likely to occur.

In addition, the partial discharge measuring apparatus and the manager terminal may determine the magnitude of the partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the occurrence frequency (PPS) of the partial discharge per second and the partial discharge occurrence frequency (PPC) per cycle. The partial discharge status of the components is counted and a warning is issued if it is determined that the risk of failure has occurred.

In addition, the partial discharge measuring device and the manager terminal displays the location of the partial discharge and its extraction value, the manager terminal determines whether a cutoff signal for the breaker is received, and when the breaker cutoff signal is received by switching the breaker to the Protect the surrounding pressure.

6 is a flowchart illustrating a monitoring method of the cable connection member partial discharge monitoring system according to a second embodiment of the present invention.

Referring to FIG. 6, the monitoring method of the cable connection member partial discharge monitoring system according to the second embodiment of the present invention includes a warning set value setting step (S200), a detection signal receiving and storing step (S210), and a partial discharge value conversion step. (S220), phase distribution and period distribution detection step (S230), comparison step (S240), abnormal state detection step (S250), count step (S260), warning generation step (S270), display step (S280) and automatic blocking The switch includes operating step (S290).

First, a warning set value is set in a partial discharge measuring device for generating an alarm by receiving a capacitance value from a plurality of partial discharge detection sensors.

When the partial discharge measuring device receives the capacitance value from the partial discharge detecting sensor, the capacitance value is converted into the partial discharge value by using the previously stored matching data, and the partial discharge measuring device uses the partial discharge value. The magnitude (QMAX) of the partial discharge value, the amount of energy (PDI) of the partial discharge value, the occurrence frequency (PPS) of the partial discharges per second and the partial discharge occurrence frequency (PPC) per cycle are calculated. That is, the phase distribution and the periodic distribution of the partial discharge value are detected.

Subsequently, the partial discharge measuring apparatus includes a preset failure set value and the magnitude of the detected partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the frequency of occurrence of partial discharge per second (PPS) and the occurrence of partial discharge per cycle. Compare the frequency (PPC) values, and simultaneously measure the magnitude of the partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the frequency of occurrence of partial discharges per second (PPS) and the frequency of partial discharges per cycle (PPC). Send to remote administrator's terminal.

Next, the partial discharge measuring apparatus and the manager terminal determines whether the partial discharge state of the cable connection member is abnormal through data comparison. In other words, it is determined whether a failure is likely to occur.

In addition, the partial discharge measuring apparatus and the manager terminal may determine the magnitude of the partial discharge value (QMAX), the amount of energy (PDI) of the partial discharge value, the occurrence frequency (PPS) of the partial discharge per second and the partial discharge occurrence frequency (PPC) per cycle. The partial discharge status of the components is counted and a warning is issued if it is determined that the risk of failure has occurred.

In addition, the partial discharge measuring device and the manager terminal displays the partial discharge generation position and its extracted value, the manager terminal automatically generates a cutoff signal for the breaker. Therefore, even in the absence of the manager to quickly shut off the power supply of the bus bar to protect the surrounding pressure.

The cable connection member partial discharge monitoring system of the indoor substation according to the embodiment of the present invention is not limited to the above-described embodiment, but various modifications can be made without departing from the technical gist of the present invention.

Although the detailed description of the present invention described above has been described with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art, those skilled in the art will be described in the claims to be described later It is apparent that the present invention can be modified and modified in various ways without departing from the technical scope.

2: Partial discharge sensor 4: Band filter
6: sensing unit 8: partial discharge measuring device 10: manager terminal

Claims (8)

A detector including a partial discharge detection sensor installed at an outer circumference of a cable connection member for connecting a gas insulated switchgear (GIS) installed in an indoor substation and a distribution cable to detect a capacitance value;
The capacitance value of the cable connecting member transmitted from the partial discharge detection sensor is applied and converted into a partial discharge value, and the phase distribution and periodic distribution of the partial discharge signal are detected from the converted partial discharge value and compared with a preset failure value. Partial discharge measuring device to thereby determine the internal failure of the cable connection member or to predict the failure; And
It is installed at a remote location and receives the partial discharge value from the partial discharge measuring device through a data communication network to monitor in real time, and generates a warning if a partial discharge value above the failure value is applied and generates a warning. An administrator terminal for controlling the opening and closing of the installed circuit breaker,
The partial discharge detection sensor is configured in the form of a flexible band, the cable connection member partial discharge monitoring system, characterized in that a plurality of coils formed therein to be wound around the outer periphery of the cable connection member.
The method of claim 1,
The sensing unit
And a band filter for removing noise by filtering a predetermined band by receiving a capacitance signal value detected from the partial discharge detection sensor inside the detection unit.
delete The method of claim 1,
The partial discharge measuring device
And a plurality of connection channels receive capacitance values from the plurality of partial discharge detection sensors.
The method of claim 1,
The manager terminal
A cable connection member partial discharge monitoring system, characterized in that a plurality of warning display means are formed of a display screen or a light emitting diode (LED) to indicate the degree of partial discharge state.
A sensing unit installed at an outer circumference of a cable connecting member for connecting a cable to a gas insulated switchgear (GIS), the sensing unit detecting a capacitance value of the cable connecting member;
A partial discharge measuring device generating partial discharge data including the magnitude of the partial discharge, the amount of energy of the partial discharge, and the frequency of the partial discharge by converting the capacitance value into the partial discharge value; And
The manager terminal generates an alert when the partial discharge data is input through a data communication network and at least one of the magnitude of the partial discharge, the amount of energy of the partial discharge, and the frequency of the partial discharge is greater than the failure value. Including,
The sensing unit, the cable connection member partial discharge monitoring system, characterized in that a plurality of coils are inserted into the flexible band is wound around the outer periphery of the cable connection member.
The method according to claim 6,
The manager terminal,
If one of the partial discharge data is greater than the failure value, and generates a first warning,
If two of the partial discharge data is greater than the failure value, and generates a second warning,
And a third warning if all of the partial discharge data is larger than the failure value.
delete

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