KR20090081772A - System and Method for Monitoring Partial Discharge in Power Cable - Google Patents

Abstract

A system and a method for monitoring partial discharge of a power cable are provided to obtain self operation electric power by installing a current converting sensor within a connection box of the power cable and using current induced electric power as a power source. A system for monitoring partial discharge of a power cable includes a partial discharge detecting unit, a partial discharge monitoring unit and a server unit. The partial discharge detecting unit(100) is mounted within a connection box of the power cable and obtains current from the cable within the connection box. A partial discharge signal is detected from the obtained current. The partial discharge monitoring unit(200) uses a phase signal at the obtained current and obtains a pulse pattern of the partial discharge signal. The partial discharge monitoring unit determines generation of partial discharge through the obtained pulse pattern and displays the determined result. The server unit(300) receives the pulse pattern of the partial discharge signal and the determined result. When it is determined that the partial discharge occurs excessively, the server unit outputs an alarm signal.

Description

System and Method for Monitoring Partial Discharge in Power Cable

The present invention relates to a system and method for monitoring partial discharge of a power cable, and in particular, by detecting and measuring partial discharge occurring inside a power cable junction box, continuously monitoring whether excessive partial discharge occurs, and measuring and monitoring The present invention relates to a partial discharge monitoring system and method of a power cable that enables a result to be reported to a manager through wired or wireless communication.

In general, the power cable includes a plurality of power transmission cables and a junction box for connecting each power transmission cable.

Here, a partial discharge of several tens of MHz may occur inside the junction box of the power cable due to an insulator abnormality. Such partial discharge causes deterioration of the transmission cable and the junction box, which shortens the life of the line or causes damage. Therefore, it is necessary to accurately measure the partial discharge of the power cable in operation.

Therefore, conventionally, the partial discharge detection sensor for detecting the partial discharge signal is attached to the ground portion connected to the outer protective copper tube of the junction box to measure the partial discharge.

However, in the partial discharge measuring method described above, since the partial discharge detection sensor must be present at the ground line outside the junction box, the junction box external ground line is formed long and is directly within the influence range of external interference factors such as noise or corona discharge signal. There is a problem that is exposed, and it is difficult to expect the accuracy of the partial discharge signal detection.

In addition, in order to monitor the excessive occurrence of partial discharge occurring in the junction box of the power cable, the administrator must go to the site in person and check each one of the junction boxes of the power cable. There is a problem that must be taken.

The present invention has been made to solve the above problems, by installing a partial discharge detection sensor in the junction box of the power cable to detect and measure the partial discharge generated in the junction box to correlate to the noise and corona outside the junction box SUMMARY OF THE INVENTION An object of the present invention is to provide a partial discharge monitoring system and method for a power cable that can accurately measure partial discharges generated in a junction box.

In addition, the present invention by installing a current conversion sensor inside the junction box of the power cable to induce the current flowing through the power cable and by using this to obtain the power to be used as a power source, by itself operating power without a separate power supply In order to be able to obtain, the purpose is.

In addition, the present invention by measuring the partial discharge generated in the junction box of the power cable in the junction box, by continuously monitoring the occurrence of excessive partial discharge, by reporting the measurement and the monitoring result to the administrator through wired and wireless communication, Its purpose is to provide managers with the safety and convenience of their work.

In order to achieve the above object, the partial discharge monitoring system of the power cable according to an embodiment of the present invention, in the partial discharge monitoring system of the power cable, mounted in the junction box of the power cable and the corresponding connection A partial discharge detector for acquiring a current from the cable inside the box and detecting a partial discharge signal; After receiving the current and the partial discharge signal from the partial discharge detection unit and checking whether the abnormal voltage of each of the current and the partial discharge signal is generated, and if the abnormal voltage is not generated, the power is generated using the provided current and the corresponding generated voltage is generated. It operates by using a power source, obtains the pulse pattern of the partial discharge signal provided from the partial discharge detection unit using the phase signal of the provided current, and determines whether excessive partial discharge occurs by using the obtained pulse pattern, A partial discharge monitor configured to display a pulse pattern of the obtained partial discharge signal and a result of determining whether a partial discharge is excessive; When the partial discharge monitoring unit receives and displays the pulse pattern of the partial discharge signal and a result of determining whether the partial discharge is excessive, an alarm is received when the result of determining that the partial discharge is excessive is provided as a result of determining whether the partial discharge is excessive. It is preferable to include a server unit for outputting a signal.

Here, the partial discharge detection unit, the current conversion sensor for obtaining a current from the cable inside the junction box; A partial discharge detection sensor detecting a partial discharge signal from a cable inside the junction box; Formed in a detachable structure with the partial discharge monitoring unit, and when attached to the partial discharge monitoring unit, the current obtained by the current conversion sensor and the partial discharge signal detected by the partial discharge detection sensor are transferred to the partial discharge monitoring unit. It is preferable to include the first connecting portion for transmitting.

The partial discharge monitoring unit may include: a second contact unit configured to be detachable from the first connection unit, and receive current and partial discharge signals from the partial discharge detection unit; A phase detector detecting a phase signal of a current transmitted from the partial discharge detector through the second connection unit; A signal converter for converting an electric signal into an optical signal; A wireless transmission and reception unit for wirelessly transmitting data; A display unit for displaying data; After receiving and amplifying and digitizing a partial discharge signal from the partial discharge detector through the second connection unit, a pulse pattern of the corresponding amplified and digitized partial discharge signal is obtained using a phase signal of the current detected by the phase detection unit. After calculating the statistical value by applying the acquired pulse pattern to the statistical analysis algorithm, and checking whether the calculated statistical value exceeds the predetermined reference value to determine whether there is excessive partial discharge, and whether the pulse pattern and partial discharge excessive occurrence A control unit for generating data about a result and displaying the result on the display unit, transmitting the signal to the server unit through the signal conversion unit and transmitting the radio signal through the wireless transmission / reception unit;

Receives current from the partial discharge detection unit through the second connection unit to generate operating power using the received current, and supplies the power to the wireless transmitter / receiver, signal conversion unit, display unit, control unit and phase detection unit, and the received current. A power supply unit for transmitting the phase detection unit; When the current and the partial discharge signal are received from the partial discharge detection unit through the second connection unit, it is determined whether an abnormal voltage of each of the received current and the partial discharge signal is generated, and if the abnormal voltage does not occur, the corresponding acquired A plurality of currents are transmitted to the power supply unit, the detected partial discharge signal is transmitted to the control unit, and when an abnormal voltage is generated, a plurality of blocks for preventing the corresponding current and the detected partial discharge signal from being transmitted to the power supply unit and the control unit, respectively. It is preferable to include a high pressure impact resistant portion.

The apparatus may further include a portable electronic device that wirelessly receives and displays data on a pulse pattern transmitted from the wireless transmitter and receiver and a result of determining whether a partial discharge is excessive.

On the other hand, the partial discharge monitoring method of the power cable according to an embodiment of the present invention, in the partial discharge monitoring method of the power cable, the partial discharge detection unit obtains a current from the cable inside the junction box, and detects the partial discharge signal Delivering to the partial discharge monitoring unit; Determining whether an abnormal voltage is generated in each of the current and the partial discharge signal received from the partial discharge detector by the partial discharge monitor; When no abnormal voltage is generated as a result of the checking, the power is generated by using the current received from the partial discharge detection unit and operated using the generated power, and the phase signal of the received current is detected to detect the corresponding signal. Acquiring a pulse pattern of the partial discharge signal received from the partial discharge detection unit using a phase signal, and determining whether the partial discharge is excessive by using the obtained pulse pattern; Displaying, by the partial discharge monitoring unit, a pulse pattern of the obtained partial discharge signal and a result of determining whether a partial discharge is excessive, and providing the result to the server unit; Receiving and displaying, by the server unit, a pulse pattern of the partial discharge signal and a determination result of excessive partial discharge from the partial discharge monitoring unit; When the server unit receives a result of determining that the partial discharge is excessive as a result of determining whether the partial discharge is excessive, preferably comprises the step of outputting an alarm signal.

The determining of whether the partial discharge is excessive may include: calculating a statistical value of the pulse pattern by applying the obtained pulse pattern to a statistical analysis algorithm; And determining whether the partial discharge is excessive according to whether the statistical value exceeds a predetermined reference value by checking the calculated statistical value.

The statistical analysis algorithm is preferably a neural network algorithm.

The displaying and providing to the server unit may further include wirelessly transmitting a pulse pattern of the obtained partial discharge signal and a result of determining whether the partial discharge is excessive.

The partial discharge monitoring system and method of the power cable according to the present invention uses a current conversion sensor installed inside the power cable connection box to induce a current flowing in the power cable and by using this to obtain the power to be used as a power source, a separate external There is an effect that can obtain its own operating power without supplying power from the power source.

In addition, by using the partial discharge detection sensor installed in the junction box of the power cable, it detects and measures the partial discharge generated in the junction box, and continuously monitors whether there is excessive partial discharge, and wired and wireless communication the result of the measurement and monitoring By reporting to the administrator through, it is possible to accurately measure the partial discharge generated in the junction box of the power cable, regardless of the noise and corona outside the junction box, there is an effect that can provide the safety and convenience of operation to the administrator.

Hereinafter, a partial discharge monitoring system and method of a power cable according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Configuration of the partial discharge monitoring system of the power cable according to an embodiment of the present invention, as shown in Figure 1, includes a partial discharge detection unit 100, a partial discharge monitoring unit 200, the server unit 300 It is done by Here, the partial discharge detection unit 100 is mounted inside the junction box to obtain current and partial discharge signals from the power cable regardless of external interference.

The partial discharge detection unit 100 and the partial discharge monitoring unit 200 may be detachable from each other.

The partial discharge monitoring unit 200 and the server unit 300 are connected to each other to enable wired communication. For example, the partial discharge monitoring unit 200 may be connected to the server unit 300 through an optical fiber.

On the other hand, the partial discharge detection unit 100 is mounted inside the junction box to obtain a current from the power cable, detects the partial discharge signal and transmits to the partial discharge monitoring unit 200.

The partial discharge detection unit 100 includes a current conversion sensor 110, a partial discharge detection sensor 120, and a first connection unit 130. Here, the current conversion sensor 110 and the partial discharge detection sensor 120 in the form of wrapping the cable 180 inside the junction box as shown in Figure 2 to obtain and detect the current and the partial discharge signal from the power cable. It is preferable that the protective copper tube 160 is mounted inside the junction box separately from the outside.

The current conversion sensor 110 converts the electromagnetic field generated by the current flowing through the cable 180 inside the junction box into a current, and transfers the converted current to the first connection unit 130. For example, the current conversion sensor 110 may be formed of a current transformer (CT) or the like.

The partial discharge detection sensor 120 detects the partial discharge signal from the cable 180 inside the junction box and transmits the partial discharge signal to the first connection unit 130. Here, the detected partial discharge signal is formed in the form of attenuation vibration wave whose resonance frequency is changed by the partial discharge detection sensor 120. For example, the partial discharge detection sensor 120 may be formed of a high frequency current transformer (HFCT).

When the first connection unit 130 is formed to be detachable from the partial discharge monitoring unit 200 and attached to the partial discharge monitoring unit 200, the current conversion sensor 110 and the partial discharge detection sensor ( The current and the partial discharge signal transmitted from the 120 is transferred to the partial discharge monitoring unit 200. For example, as illustrated in FIG. 3, the first connection unit 130 may have a power outlet.

Meanwhile, the partial discharge monitoring unit 200 is attached to the partial discharge detection unit 100 to receive current and partial discharge signals from the partial discharge detection unit 100 to generate an abnormal voltage of each of the received current and partial discharge signals. After checking whether or not an abnormal voltage is generated, the power is generated using the received current and operated using the generated power. After detecting the phase signal of the received current, the detected phase signal is detected. Acquire a pulse pattern of the partial discharge signal received from the partial discharge detection unit 100 by using, and after determining whether the partial discharge excessive occurrence through the obtained pulse pattern, and determines whether the excessive pulse pattern and the partial discharge excessive occurrence The results are displayed and provided to the server unit 300, and wirelessly transmitted to the outside.

The partial discharge monitoring unit 200 includes a second connection unit 210, a power supply unit 220, a wireless transmission / reception unit 230, a display unit 240, a first signal conversion unit 250, a control unit 260, and a first high voltage. The impact prevention unit 270, the second high pressure impact prevention unit 280, and the phase detection unit 290 are included.

The second connection unit 210 is formed in a structure that is detachable to the partial discharge detection unit 100, that is, the first connection unit 130, and when attached to the partial discharge detection unit 100, the partial discharge detection unit ( Receives a current and a partial discharge signal from the 100, the received current is transmitted to the power supply unit 220 through the first high pressure impact prevention unit 270, the partial discharge signal is the second high pressure impact prevention unit ( Transfer to the control unit 260 through 280. For example, as shown in FIG. 3, the second connection unit 210 may be implemented in the form of a power plug.

The power supply unit 220 receives the current through the first high pressure shock prevention unit 270 from the second connection unit 210 generates the operating power using the received current to the wireless transmission and reception unit 230, The signal is supplied to the first signal converter 250, the display unit 240, the controller 260, and the phase detector 290.

Meanwhile, the power supply unit 220 transfers the current received from the second connection unit 210 through the first high pressure shock prevention unit 270 to the phase detection unit 290.

The wireless transmitter / receiver 230 wirelessly transmits the data received from the controller 260.

The display unit 240 displays the data received from the controller 260. For example, the display unit 240 may include an LCD monitor.

The first signal converter 250 converts the data received from the controller 260 into an optical signal and transmits the data to the server unit 300. For example, the first signal converter 250 may be formed of an E / O (electrical / optical) converter.

The phase detector 290 receives a current from the power supply unit 220, detects a phase signal of the received current, and transmits the phase signal to the controller 260.

The control unit 260 amplifies and digitizes the partial discharge signal received from the first connection unit 130, and then uses the phase signal received from the phase detection unit 290 to amplify and digitize the partial discharge signal. Acquire a pattern. The controller 260 calculates a statistical value of the obtained pulse pattern by using a statistical analysis algorithm, and then determines whether the partial discharge is excessive by checking whether the calculated statistical value exceeds a predetermined reference value, and determining a pulse pattern. To generate data for the result of the excessive partial discharge over whether the display unit 240, the first signal conversion unit 250 and the wireless transmission and reception unit 230.

For example, the controller 260 may use a neural network algorithm as a statistical analysis algorithm.

In addition, the controller 260 may be configured to obtain an amplifier for amplifying the partial discharge signal received from the first connection unit 130, an A / D converter for digitizing the partial discharge signal amplified from the amplifier, and a digital signal from the A / D converter. It may be made of an embedded system having an embedded central processing unit (CPU) for performing arithmetic processing.

On the other hand, the first high-voltage impact protection unit 270 receives the current from the second connection unit 210 and after confirming whether the abnormal voltage of the received current occurs, the current received when the abnormal voltage does not occur It is delivered to the power supply 220. On the other hand, when the abnormal voltage occurs, the received current is cut off so that it is not transmitted to the power supply unit 220.

When the second high voltage impact prevention unit 280 receives the partial discharge signal from the second connection unit 210 and checks whether an abnormal voltage of the received partial discharge signal is generated, the abnormal voltage does not occur. The received partial discharge signal is transmitted to the controller 260. On the other hand, when an abnormal voltage occurs, the partial discharge signal received is cut off so as not to be transmitted to the power supply unit 220.

The first and second high pressure impact protection units 270 and 280 check whether the voltage level of each of the current and the partial discharge signal received from the second connection unit 210 exceeds the predetermined reference voltage level. If it does not exceed, it is preferable to determine that no abnormal voltage has occurred.

For example, each of the first and second high pressure impact prevention parts 270 and 280 may be formed of a surge arrester or the like.

The server unit 300 receives and displays data on the pulse pattern of the partial discharge signal and the result of determining whether the partial discharge is excessive from the partial discharge monitoring unit 200.

The server unit 300 includes a second signal converter 310 and a main server 320.

The second signal converter 310 converts the data received from the partial discharge monitoring unit 200 into an electrical signal and transmits the data to the main server 320. For example, the second signal converter 310 may be formed of an optical / electrical (O / E) converter.

The main server 320 receives the data on the pulse pattern of the partial discharge signal received from the partial discharge monitoring unit 200 and the result of determining whether the partial discharge is excessive through the second signal converter 310. Display. Here, the main server 320 outputs an alarm signal when it is determined that the partial discharge is excessive as a result of determining whether the partial discharge is excessive. For example, the main server 320 may be a personal computer (PC) or the like.

In the above-described configuration, a partial discharge monitoring method for a power cable according to an embodiment of the present invention will be described. As shown in FIG. 4, first, the partial discharge detection unit mounted inside the connection box of the power cable ( When the 100 and the partial discharge monitoring unit 200 are attached, the partial discharge detection unit 100 obtains a current from the cable 180 in the junction box to which it is mounted, and detects the partial discharge signal. The partial discharge monitoring unit 200 is transferred (step S10).

Accordingly, the partial discharge monitoring unit 200 receives the current and the partial discharge signal from the partial discharge detection unit 100 and checks whether or not an abnormal voltage occurs, respectively, and when it is confirmed that no abnormal voltage is generated, the corresponding received current Generates power by using and operates using the generated power (step S20), detects a phase signal of the received current, and then uses the detected phase signal from the partial discharge detection unit 100. Acquire a pulse pattern of the received partial discharge signal (step S30), calculate the statistical value of the pulse pattern by applying the obtained pulse pattern to a statistical analysis algorithm, and check the calculated statistical value to determine whether the statistical value exceeds a predetermined reference value. It is determined whether or not partial discharge excess occurs according to whether or not (step S40), and data on the corresponding pulse pattern and the result of determining whether partial discharge excess occurs. To generate and display through the provided display unit 240, and transmits to the server unit 300 (step S50), the wireless transmission and reception via the wireless transmission and reception unit 230 provided on the other hand.

Accordingly, the server 300 receives the data about the pulse pattern of the partial discharge signal and the result of determining whether the partial discharge is excessive from the partial discharge monitoring unit 200 and displays it (step S60). Here, the server unit 300 outputs an alarm signal when the partial discharge monitoring unit 200 receives data on a result of determining that the partial discharge is excessive as a result of determining whether the partial discharge is excessive. .

Alternatively, the power cable manager is a portable electronic device having a wireless communication module for transmitting and receiving data wirelessly and a display device for outputting the received data without being close to the junction of the power cable (not shown in the drawings for convenience of description). It can be confirmed by wirelessly receiving data on the pulse pattern and the result of determining whether the partial discharge excessively transmitted from the partial discharge monitoring unit 200 by wireless.

The system and method for monitoring partial discharge of a power cable according to the present invention installs a partial discharge detection sensor inside a connection box of a power cable to detect and measure partial discharge generated in the junction box and continuously monitors whether there is excessive partial discharge. By reporting the result of the measurement and monitoring to the administrator through wired and wireless communication, it is possible to accurately measure the partial discharge generated from the junction box of the power cable regardless of the noise and corona outside the junction box, And convenience.

1 is a block diagram schematically showing the configuration of a partial discharge monitoring system of a power cable according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a cross section inside the junction box in which the current conversion sensor and the partial discharge detection sensor are mounted in FIG. 1. FIG.

FIG. 3 is a diagram illustrating a first connection part and a second connection part in FIG. 1.

4 is a process diagram sequentially illustrating a partial discharge monitoring method of a power cable according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: partial discharge detection unit 110: current conversion sensor

120: partial discharge detection sensor 130: first connection portion

160: protective copper tube 162: sheath (Sheath)

164, 166: whole semiconductor 168: insulator

170: conductor 180: cable

200: partial discharge monitoring unit 210: second connection unit

220: power supply unit 230: wireless transmission and reception unit

240: display unit 250: first signal conversion unit

260: control unit 270: first high pressure impact prevention unit

280: second high pressure impact prevention unit 290: phase detection unit

300: server unit 310: second signal conversion unit

320: main server

Claims (8)

In the partial discharge monitoring system of the power cable, A partial discharge detection unit mounted inside the junction box of the power cable to obtain a current from a cable inside the mounted junction box and detect a partial discharge signal; After receiving the current and the partial discharge signal from the partial discharge detection unit and checking whether the abnormal voltage of each of the current and the partial discharge signal is generated, and if the abnormal voltage is not generated, the power is generated using the provided current and the corresponding generated voltage is generated. It operates by using a power source, obtains the pulse pattern of the partial discharge signal provided from the partial discharge detection unit using the phase signal of the provided current, and determines whether excessive partial discharge occurs by using the obtained pulse pattern, A partial discharge monitor configured to display a pulse pattern of the obtained partial discharge signal and a result of determining whether a partial discharge is excessive; When the partial discharge monitoring unit receives and displays the pulse pattern of the partial discharge signal and a result of determining whether the partial discharge is excessive, an alarm is received when the result of determining that the partial discharge is excessive is provided as a result of determining whether the partial discharge is excessive. Partial discharge monitoring system for a power cable comprising a server unit for outputting a signal. The method of claim 1, The partial discharge detection unit includes a current conversion sensor for acquiring a current from a cable inside the junction box; A partial discharge detection sensor detecting a partial discharge signal from a cable inside the junction box; Formed in a detachable structure with the partial discharge monitoring unit, and when attached to the partial discharge monitoring unit, the current obtained by the current conversion sensor and the partial discharge signal detected by the partial discharge detection sensor are transferred to the partial discharge monitoring unit. Partial discharge monitoring system for a power cable comprising a first connection for transmitting. The method of claim 2, The partial discharge monitoring unit may include: a second connection unit formed to be detachable from the first connection unit, and receiving current and partial discharge signals from the partial discharge detection unit; A phase detector detecting a phase signal of a current transmitted from the partial discharge detector through the second connection unit; A signal converter for converting an electric signal into an optical signal; A wireless transmission and reception unit for wirelessly transmitting data; A display unit for displaying data; After receiving and amplifying and digitizing a partial discharge signal from the partial discharge detector through the second connection unit, a pulse pattern of the corresponding amplified and digitized partial discharge signal is obtained using a phase signal of the current detected by the phase detection unit. After calculating the statistical value by applying the acquired pulse pattern to the statistical analysis algorithm, and checking whether the calculated statistical value exceeds the predetermined reference value to determine whether there is excessive partial discharge, and whether the pulse pattern and partial discharge excessive occurrence A control unit for generating data about a result and displaying the result on the display unit, transmitting the signal to the server unit through the signal conversion unit and transmitting the radio signal through the wireless transmission / reception unit; Receives current from the partial discharge detection unit through the second connection unit to generate operating power using the received current, and supplies the power to the wireless transmitter / receiver, signal conversion unit, display unit, control unit and phase detection unit, and the received current. A power supply unit for transmitting the phase detection unit; When the current and the partial discharge signal are received from the partial discharge detection unit through the second connection unit, it is determined whether an abnormal voltage of each of the received current and the partial discharge signal is generated, and if the abnormal voltage does not occur, the corresponding acquired A plurality of currents are transmitted to the power supply unit, the detected partial discharge signal is transmitted to the control unit, and when an abnormal voltage is generated, a plurality of blocks for preventing the corresponding current and the detected partial discharge signal from being transmitted to the power supply unit and the control unit, respectively. Partial discharge monitoring system for a power cable comprising a high pressure shock prevention unit. The method of claim 3, Partial discharge monitoring system for a power cable characterized in that it further comprises a portable electronic device for wirelessly receiving and displaying data on the pulse pattern and the result of the partial discharge excessive determination output from the wireless transmission and reception unit. In the partial discharge monitoring method of the power cable, Acquiring a current from a cable inside the junction box by the partial discharge detection unit, detecting a partial discharge signal, and transmitting the current to the partial discharge monitoring unit; Determining whether an abnormal voltage is generated in each of the current and the partial discharge signal received from the partial discharge detector by the partial discharge monitor; When no abnormal voltage is generated as a result of the checking, the power is generated by using the current received from the partial discharge detection unit and operated using the generated power, and the phase signal of the received current is detected to detect the corresponding signal. Acquiring a pulse pattern of the partial discharge signal received from the partial discharge detection unit using a phase signal, and determining whether the partial discharge is excessive by using the obtained pulse pattern; Displaying, by the partial discharge monitoring unit, a pulse pattern of the obtained partial discharge signal and a result of determining whether a partial discharge is excessive, and providing the result to the server unit; Receiving and displaying, by the server unit, a pulse pattern of the partial discharge signal and a determination result of excessive partial discharge from the partial discharge monitoring unit; And outputting an alarm signal when the server unit receives a result of determining that the partial discharge is excessive as a result of determining whether the partial discharge is excessive. The method of claim 5, The determining whether the partial discharge is excessive may include: calculating a statistical value of the pulse pattern by applying the obtained pulse pattern to a statistical analysis algorithm; And determining whether the partial discharge is excessive according to whether the statistical value exceeds a predetermined reference value by checking the calculated statistical value. The method of claim 6, The statistical analysis algorithm is a neural network algorithm, the partial discharge monitoring method of the power cable. The method of claim 5, The displaying and providing to the server unit may include wirelessly transmitting a pulse pattern of the obtained partial discharge signal and a result of determining whether the partial discharge is excessive.

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