KR20210073877A - Partial discharge sensor for high-voltage direct current cable and method for installing the same - Google Patents

Abstract

Disclosed are an HVDC cable partial discharge measurement sensor and an attaching method thereof. According to one aspect of the present invention, the HVDC cable partial discharge measurement sensor includes: a sensor unit which is attached to a predetermined position of a high-voltage direct current (HVDC) cable and detects a partial discharge signal of the HVDC cable; and a shielding band which is disposed along the outer peripheral surface of the HVDC cable with the sensor unit and blocks external noise flowing into the sensor unit.

Description

HVDC cable partial discharge measuring sensor and its attachment method {PARTIAL DISCHARGE SENSOR FOR HIGH-VOLTAGE DIRECT CURRENT CABLE AND METHOD FOR INSTALLING THE SAME}

The present invention relates to an HVDC cable partial discharge measurement sensor and a method for attaching the same, and more particularly, to an HVDC cable partial discharge measurement sensor and method for attaching the same, which can block external noise without using a noise sensor in the HVDC partial discharge measurement system is about

High-Voltage Direct Current (HVDC) cables are not affected by capacitive charging current, so long-distance transmission is possible, and large-capacity transmission is possible because they are not affected by frequency and induction losses such as dielectric loss and sheath loss.

In addition, since the AC loss is small, the transmission loss is reduced, and the power flow and load control are easy to increase the line utilization rate, the domestic/overseas market is gradually increasing.

In Korea, the ±180kV Jeju-Haenam HVDC cable and ±250kV Jeju-Jindo HVDC cable business are gradually expanding to the onshore HVDC underground line, including the ±500kV Bukdangjin-Godeok HVDC cable business. The power system linkage project is being actively carried out.

However, the partial discharge diagnosis of HVDC cables, which is mainly applied to long-distance submarine cables, has limitations in the application of the diagnostic method due to problems such as high-frequency signal attenuation, and thus related research has not been actively conducted. However, with the recent increase in construction and operation of HVDC cables over land, various installation methods are applied to the HVDC cable system and the number of junction boxes is increasing, so the need for diagnosis through partial discharge measurement is emerging.

In general, partial discharges occurring in power cables are divided into void discharge, corona discharge, and surface discharge. Void discharge is a discharge that occurs in a void (void) in a solid insulator, and corona discharge is a discharge phenomenon that occurs at a sharp electrode in a gas/liquid. , surface discharge means the discharge that appears between different insulators.

This partial discharge phenomenon can occur in both AC (Alternating Current) cables and HVDC cables when there is a defect in the insulator when the discharge inception voltage is exceeded at the defective part by an external electric field. Depending on the pulse polarity, size, and interval between pulses, the partial discharge measurement method shown in AC cable and HVDC cable is different.

The HVDC partial discharge measurement system is manufactured based on the existing AC partial discharge measurement system, but since there is no phase in DC, it is used as a PD (Partial Discharge) measurement channel and a noise channel.

However, in the HVDC cable system, it is difficult to obtain data due to the low repetition rate of the PD signal, and even with noise gating, the DC PD signal can be removed by numerous noise signals, thereby obtaining inaccurate diagnostic results.

As a prior art related to the present invention, there is registered Patent Publication No. 10-1977916 (announced on May 13, 2019, title of the invention: partial discharge sensor).

The present invention has been devised to improve the above problems, and an object according to an aspect of the present invention is an HVDC cable partial discharge measuring sensor that can block external noise without using a noise sensor in the HVDC partial discharge measuring system, and its An attachment method is provided.

The problem to be solved by the present invention is not limited to the problem(s) mentioned above, and another problem(s) not mentioned will be clearly understood by those skilled in the art from the following description.

The HVDC cable partial discharge measurement sensor according to an aspect of the present invention is attached to a predetermined position of an HVDC (High-Voltage Direct Current) cable, and a sensor unit for detecting a partial discharge occurrence signal of the HVDC cable, the sensor unit and HVDC It is disposed along the outer circumferential surface of the cable, and includes a shielding band for blocking external noise flowing into the sensor unit.

In the present invention, the sensor unit may be a contact-type inductive sensor.

In the present invention, the shielding band includes a first insulating layer disposed at the outermost layer, a shielding layer disposed under the first insulating layer, to which eddy current shielding and magnetic flux shielding are applied, and a second insulating layer disposed under the shielding layer. may include

In the present invention, an eddy current shielding material and a magnetic flux shielding material are embedded in the shielding layer, the eddy current shielding material may be formed of a highly conductive metal material, and the magnetic flux shielding material may be formed of a ferromagnetic material.

In the present invention, the shielding band may be a wearable shielding band.

In the present invention, the shielding band may be formed with a detachable member for attaching and detaching both ends, and the detachable member may be an adhesive tape.

HVDC cable partial discharge measurement sensor attachment method according to another aspect of the present invention is a method of attaching an HVDC cable partial discharge measurement sensor to an HVDC (High-Voltage Direct Current) cable, wherein the sensor part is fixed to a predetermined position of the HVDC cable and disposing a shielding band along an outer circumferential surface of the sensor unit and the HVDC cable, and connecting both ends of the shielding band.

The HVDC cable partial discharge measuring sensor and its attachment method according to an embodiment of the present invention include a shielding band provided with a shielding material using a magnetic flux shielding method and an eddy current shielding method in combination with a sensor unit for measuring partial discharge of an HVDC cable; By integrating them, the shielding performance can be maximized and the measurement sensitivity can be improved by reducing the influence from external noise.

The HVDC cable partial discharge measuring sensor and the method for attaching the same according to an embodiment of the present invention can minimize the sensor installation time by mounting the partial discharge measuring sensor in a manner of wrapping the HVDC cable in a wearable band form.

On the other hand, the effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within the range apparent to those skilled in the art from the description below.

1 is a block diagram of an HVDC cable partial discharge measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a hardware configuration diagram of the partial discharge meter shown in FIG. 1 .
3 is an example of the installation of the partial discharge measuring sensor HVDC cable in the partial discharge measuring instrument shown in FIG.
4 is a perspective view illustrating a HVDC cable partial discharge measuring sensor according to an embodiment of the present invention.
5 is a view for explaining the structure of the HVDC cable partial discharge measurement sensor according to an embodiment of the present invention.
6 is a graph showing comparative analysis results of partial discharge measurement waveforms according to voltage sources according to an embodiment of the present invention.
7 is a view for explaining an eddy current and magnetic flux shielding method according to an embodiment of the present invention.
8 is a view for explaining the concept of measuring a partial discharge (PD) signal and shielding external noise according to an embodiment of the present invention.
9 is a perspective view illustrating a structure in which an HVDC cable partial discharge measurement sensor is coupled to an HVDC cable according to an embodiment of the present invention.
10 is a view for explaining a structure in which the HVDC cable partial discharge measurement sensor is coupled to the HVDC cable according to an embodiment of the present invention.
11 is a view for explaining a shielding material of the HVDC cable partial discharge measurement sensor according to an embodiment of the present invention.

Hereinafter, an HVDC cable partial discharge measuring sensor and a method for attaching the same according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a block diagram of an HVDC cable partial discharge measuring apparatus according to an embodiment of the present invention.

1, the HVDC cable partial discharge measuring apparatus 100 obtains measurement result information from the HVDC cable partial discharge measurement sensor 110 and the HVDC cable partial discharge measurement sensor 110 installed in the HVDC cable cable, and the A plurality of partial discharge measuring devices 130-1 to 130-n for generating partial discharge measurement information by applying the measurement result information to a preset analysis mode, and an analysis computer for determining whether partial discharge using the partial discharge measurement information (150) and the like may be configured.

In addition, the HVDC cable partial discharge measurement apparatus 100 may include a power supply 140 for continuous partial discharge measurement. The power supply 140 may be an Uninterruptible Power Supply (UPS). Of course, without separately configuring the power supply 140, each HVDC cable partial discharge measuring sensor 110, partial discharge measuring device 130-1 to 130-n, the power supply may be configured in the analysis computer 150, etc. have.

In addition, the first to nth monitors 170-1 to 170-n for receiving the analysis information by the analysis computer 150 and displaying it are configured. Of course, these monitors 170-1 to 170-n may be monitors of communication terminals. The communication terminal may be a notebook computer, a smart phone, a smart pad, a desktop computer, or the like.

Therefore, the first to nth monitors 170-1 to 170-n may be configured to correspond to the first to nth partial discharge meters 130-1 to 130-n, respectively, and the setting screen of these partial discharge meters 130-1 to 130-n. , result data, etc. can be displayed.

In addition, the HVDC cable partial discharge measuring device 100 may be configured with a remote controller 160 that can be controlled through wireless communication even at a remote location. The remote controller 160 may be a communication terminal.

A converter 120 may be configured between the HVDC cable partial discharge measuring sensor 110 and the first partial discharge measuring device 130 - 1 . The converter 120 performs a function of converting an RS232 signal into a TCP/IP (Transport Control Protocol/Internet Protocol) signal. Of course, although the converter 120 is configured and illustrated in FIG. 1, it is also possible to configure such a converter in the first to nth partial discharge measuring devices 130-1 to 130-n, and the HVDC cable partial discharge measuring sensor 110 ) and the first partial discharge meter 130-1 may be connected by wireless communication.

The first to nth partial discharge meters 130 - 1 to 130 - n are connected in series, and the first partial discharge meter 130 - n is finally connected to the analysis computer 150 . That is, the LAN1 port of the first partial discharge meter 130-1 is connected to the converter 120, and the LAN2 port of the first partial discharge meter 130-1 is connected to the LAN1 port of the second partial discharge meter 130-2. connected to the port. The rest of the partial discharge meters are connected in a similar way.

Of course, the first to nth partial discharge measuring devices 130-1 to 130-n are illustrated as being connected by wire through a LAN (Local Area Network) cable, but they may also be connected using a wireless LAN.

The first to nth partial discharge measuring instruments 130-1 to 130-n measure the frequency analysis mode for analyzing using the measured frequency, the partial discharge pulse analysis mode for analyzing using the measured pulse, and the time difference between the measured pulses. It is divided into the used time difference analysis mode, and simultaneous measurement of 8 channels is possible in each mode. The number of simultaneous measurement channels in each mode can be changed according to the condition of the measurement cable.

Finally, the partial discharge signals measured by the first to nth partial discharge measuring devices 130-1 to 130-n are subjected to calculation and signal processing to transmit data to the analysis computer 150 .

In addition, the first to n-th partial discharge measuring devices 130-1 to 130-n are given a unique IP for each device, so that the partial discharge measuring device capable of simultaneous measurement with 8 channels or more channels is one analysis computer 150 It can also be used as plural in

FIG. 2 is a hardware configuration diagram of the partial discharge meter shown in FIG. 1 .

Referring to FIG. 2 , the partial discharge measuring device can select commercial power and DC power input terminal 210 , commercial power or DC power supplied with power from a distribution line (not shown) or a power supply (140 in FIG. 1 ). Commercial power, DC power selection toggle switch 220, equipment power confirmation LED (Light Emitting Diode) (230-PWR) to check whether power is applied, equipment initial boot confirmation LED ( 230-Ready), network communication confirmation LED (③-Com) to check whether network communication is possible, data communication confirmation LED indicating whether data communication is possible (230-Data), measured in Stand Alone Mode Function to measure the equipment itself without a laptop. Operation check LED (230-SAM), LAN communication port (Port) 240, optical communication port (250), analog signal input BNC (Bayonet) capable of simultaneous measurement with 8 channels or more channels Neil-Concelman port (260), external trigger (EXTTrigger) signal input BNC port (270) in Scope mode, commercial power external synchronization (EXT SYNC) input BNC port (280) in frequency analysis mode, GPS (Global Positioning System) consists of an antenna port 290 and the like for connecting an antenna (ANT).

Of course, a processor, circuit, electronic device, memory, software, etc. are configured to be connected to these terminals, LEDs, ports, and the like to process signals and data. Memory includes flash memory disk (SSD: Solid State Disk), hard disk drive, flash memory, EEPROM (Electrically erasable programmable read-only memory), SRAM (Static RAM), FRAM (Ferro-electric RAM), PRAM (Phase-change) RAM), non-volatile memory such as magnetic RAM (MRAM), etc. and/or volatile memory such as dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double date rate-SDRAM (DDRSDRAM), etc. can

FIG. 3 is an example of installation of a partial discharge measuring sensor for an HVDC cable in the partial discharge measuring device shown in FIG. 1 .

Referring to FIG. 3 , the HVDC cable partial discharge measurement sensor 300 is installed on the HVDC cable 400 . When the HVDC cable partial discharge measurement sensor 300 is installed, it is possible to measure without going through a gating process using a noise sensor. That is, the HVDC cable partial discharge measurement sensor 300 may be connected to the port 260 by a pair (A1, A2, B1, B2, C1, C2, N1, N2) through the connection wire 265 .

4 is a perspective view showing the HVDC cable partial discharge measuring sensor according to an embodiment of the present invention, FIG. 5 is a view for explaining the structure of the HVDC cable partial discharge measuring sensor according to an embodiment of the present invention, and FIG. 6 is the present invention A graph showing a comparative analysis result of a partial discharge measurement waveform according to a voltage source according to an embodiment of the present invention, FIG. 7 is a view for explaining an eddy current and magnetic flux shielding method E according to an embodiment of the present invention, and FIG. 8 is a diagram of the present invention A diagram for explaining the concept of partial discharge (PD) signal measurement and external noise shielding according to an embodiment, FIG. 9 is a perspective view showing a structure in which an HVDC cable partial discharge measurement sensor according to an embodiment of the present invention is coupled to an HVDC cable , FIG. 10 is a view for explaining a structure in which the HVDC cable partial discharge measurement sensor according to an embodiment of the present invention is coupled to the HVDC cable, and FIG. 11 is a shielding material of the HVDC cable partial discharge measurement sensor according to an embodiment of the present invention. It is a drawing for explaining.

4 and 5 , the HVDC cable partial discharge measuring sensor 300 according to an embodiment of the present invention includes a sensor unit 310 and a shielding band 320 .

The sensor unit 310 is attached to a predetermined position of a High-Voltage Direct Current (HVDC) cable, and detects a partial discharge occurrence signal of the HVDC cable 400 . The sensor unit 310 may be, for example, a contact-type inductive sensor.

The contact-type inductive sensor is attached to the surface of the cable or junction box, and can be applied regardless of the installation location of the cable itself, the intermediate junction box, or the terminal junction box. Accordingly, the HVDC cable partial discharge measurement sensor 300 according to the present invention may use a contact-type inductive sensor. At this time, the contact-type inductive sensor may have specifications of sensitivity: 5pC±1%, measurement frequency range: 5MHz to 400MHz, characteristic impedance: 50Ω, operating temperature range: -10 to 85℃.

On the other hand, there is a difference in the electric field governing equations depending on the AC voltage source and the DC voltage source, so the mechanism of partial discharge according to the voltage source in a cable fault is different. However, when the charge accumulates in the fault and the discharge occurs locally exceeding the discharge start voltage, the frequency characteristics Because of this similarity, the measurement frequency band of the partial discharge sensor used for the existing AC cable can also be applied to the HVDC cable 400 .

As a result of performing an experiment to confirm the waveform of the partial discharge signal in the sample simulating the artificial defect of AC and DC voltage, the waveform of the partial discharge signal as shown in FIG. 6 can be confirmed. That is, when AC voltage is applied, the partial discharge waveform has a rise time of 4.3 ns to the peak, and the peak voltage is about 1 V. When DC voltage is applied, it can be confirmed that the partial discharge waveform has a rise time of 5 ns to the peak and a peak voltage of about 1.5 V. . Although there is a slight difference in the peak voltage, it can be confirmed that the highest frequency range is very similar, and it can be confirmed that the contact-type inductive sensor, which is a partial discharge sensor for an existing AC cable, can also be applied to the HVDC cable 400 .

The shielding band 320 is disposed along the outer peripheral surface of the sensor unit 310 and the HVDC cable 400 to block external noise flowing into the sensor unit 310 . The shielding band 320 is disposed under the first insulating layer 322 and the first insulating layer 322 disposed on the outermost side as shown in FIG. 5, and the shielding layer 324 to which eddy current shielding and magnetic flux shielding are applied. ), and a second insulating layer 326 disposed under the shielding layer 324 .

The first insulating layer 322 may have a structure that surrounds the shielding layer 324 to prevent damage to the shielding layer 324 , and the second insulating layer 326 is a magnetic field path from the inside of the HVDC cable 400 . It may be made thicker than the first insulating layer 322 so as to be secured and guided to the ferrite core 314 .

The shielding layer 324 includes an eddy current shielding material and a magnetic flux shielding material, so that the eddy current shielding method and the magnetic flux shielding method can be applied in combination. In this case, the eddy current shielding material may be formed of a highly conductive metal material having excellent conductivity, such as aluminum or copper, and the magnetic flux shielding material may be formed of a ferromagnetic material having high relative permeability, such as mumetal permalloy, silver fiber, and nickel.

In general, the shielding method can be divided into an eddy current shielding method and a magnetic flux shielding method.

The eddy current shielding method may be a method of shielding by installing a conductive shielding material around the formation of a magnetic field according to the application of a cable current, forming a reverse magnetic field by the reverse current according to Faraday's induction law, and partially canceling it. The shielding material for the eddy current shielding method requires a metal material of high conductivity, and in general, a light and economical aluminum material can be used. When reverse current flows through aluminum, it generates Joule heat and becomes thermal resistance, which can act as a disadvantage of reducing the allowable current of the cable and reducing the power transmission capacity. In particular, the shielding performance of the eddy current shielding method decreases as the frequency goes to a DC magnetic field of 0, which may be because the efficiency of the eddy current shielding method has a characteristic proportional to the frequency of the magnetic field. In other words, if only aluminum is applied to the HVDC cable partial discharge measurement sensor 300, the HVDC cable partial discharge measurement sensitivity may be affected by the low-frequency component of the pure DC magnetic field or ripple of the HVDC cable 400. In the eddy current shielding method, when the size of the shielding material increases, the area increases, and when the area increases, the electrical resistance decreases, so that the eddy current flows better and the shielding performance can be increased. Therefore, although the eddy current shielding method is suitable for a large-sized GIS (Gas Insulated Switchgear), there is a limit to using it as a small-sized shielding material such as a sensor, so a shielding method suitable for the HVDC cable partial discharge measurement sensor 300 is required.

The magnetic flux shielding method may be a method of shielding by blocking penetration into the sensor by using a magnetic field physics phenomenon that allows the magnetic flux of external electromagnetic waves to enter the inside of the shielding material by using a ferromagnetic material with high magnetic permeability. Since the magnetic flux shielding method has a property of entering the shielding material having high magnetic permeability compared to the surrounding medium, the magnetic field stays in the shielding material to reduce the surrounding magnetic field density. Since the shielding method using such a ferromagnetic material is a shielding method suitable for a relatively small scale, it can be used in a structure having a small size, such as the partial discharge measuring sensor 300 . In addition, since the shielding method using a ferromagnetic material does not reduce the shielding performance even in low frequency and DC magnetic fields, it is possible to fundamentally block the influence from the HVDC cable 400, and only the pure discharge signal inside the HVDC cable 400 insulator can be measured. can

Therefore, in the shielding band 320 according to the present invention, in order to use the eddy current shielding method and the magnetic flux shielding method in combination, a shielding material suitable for each method may be embedded in various configuration methods as shown in FIG. 7 . Although the eddy current shielding method is advantageous in shielding the high frequency band, it is disadvantageous to the shielding of the low frequency band. To overcome this, a composite shielding method reinforced with the magnetic flux shielding method can be used to smoothly shield from the low frequency band to the high frequency band. . Such a composite shielding method can be double-complemented by an eddy current shielding method even for electromagnetic waves that have passed through a ferromagnetic material, and on the contrary, the shielding effect can be maximized with a ferromagnetic material for the part where the reduction effect is slow due to the eddy current shielding.

When a partial discharge occurs due to a defect in the insulator of the HVDC cable 400, the partial discharge (PD) signal is moved to the ground side by the metal sheath outside the insulator as shown in FIG. 8. Measurement of partial discharge of the HVDC cable to which the composite shield is applied When the partial discharge signal is measured using the sensor 300, since the sensor of the surrounding line is also shielded, there is an advantage that the partial discharge signal is not induced. In addition, since the HVDC cable system does not apply cross bonding, if only the induction of the partial discharge signal can be prevented, the generation position of the discharge source can be easily distinguished from phase (phase). Accordingly, the HVDC cable partial discharge measurement sensor 300 according to the present invention may include a shielding band 320 as a means for shielding the HVDC cable 400 in the circumferential direction.

As described above, the shielding band 320 may use a composite shielding method in which an eddy current shielding method and a magnetic flux shielding method are combined. In addition, the shielding band 320 has a built-in shielding material capable of shielding a path through which air waves or corona noise can penetrate to the ferrite core 314 inside the sensor unit 310, and is wrapped with insulation. have.

In addition, since the shielding band 320 should be disposed along the outer diameter of the HVDC cable 400 as if wearing a watch on the wrist, it may be in a wearable form.

In addition, the shielding band 320 may be formed with a detachable member 328 for attaching and detaching both ends. Here, the detachable member 328 may be, for example, an adhesive tape. That is, the HVDC cable partial discharge measurement sensor 300 may apply the Velcro tape to the wearable shielding band 320 in order to be detachably attached to the HVDC cable 400 . In addition, since the shielding band 320 has to flexibly stretch to a certain part according to the outer diameter of the HVDC cable 400, it may be formed of a rubber material.

When the sensor unit 310 and the shielding band 320 are combined, it may have a shape as shown in FIG. 5 . That is, the HVDC cable partial discharge measurement sensor 300 includes a contact-type inductive sensor output unit 312 , a ferrite core 314 , a second insulating layer 326 , a shielding layer 324 , and a second insulating layer 326 . and a contact-type inductive sensor 310 .

When the HVDC cable partial discharge measurement sensor 300 configured as described above is to be installed on the HVDC cable 400 , first, the sensor unit 310 is fixed to the attachment position of the HVDC cable 400 . Then, when the shielding band 320 is wound thereon and attached to each other using Velcro tapes at both ends (both ends) of the shielding band, the HVDC cable partial discharge measuring sensor 300 can be attached to the HVDC cable 400 as shown in FIG. have. At this time, the HVDC cable partial discharge measurement sensor 300 may be attached to the HVDC cable 400 with a fine air layer 500 as shown in FIG. 10 . The HVDC cable 400 may include an outer layer 410 , a metal sheath 420 , an insulator 430 , and a conductor 440 .

When both ends of the shielding band 320 are attached to each other and fixed, the built-in shielding material is connected to each other in a loop shape to shield noise signals from all directions. In the HVDC cable partial discharge measurement sensor 300 to which the shielding band 320 is coupled, a shielding material of mu-metal permalloy is present as shown in red in FIG. 11 to shield external noise.

As described above, the HVDC cable partial discharge measuring sensor and its attachment method according to an embodiment of the present invention measure the partial discharge of the HVDC cable using a shielding band provided with a shielding material using a magnetic flux shielding method and an eddy current shielding method in combination. By integrating it with the sensor unit 310, it is possible to maximize the shielding performance and improve the measurement sensitivity by reducing the influence from external noise.

The HVDC cable partial discharge measurement sensor and the method for attaching the same according to an embodiment of the present invention can minimize the sensor installation time by mounting the partial discharge measurement sensor in a manner of wrapping the HVDC cable in a wearable band form.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Therefore, the true technical protection scope of the present invention should be defined by the following claims.

300: HVDC cable partial discharge measurement sensor
310: sensor unit
320: shielding band
322: first insulating layer
324: shielding layer
326: second insulating layer
400: HVDC cable

Claims (8)

a sensor unit attached to a predetermined position of a High-Voltage Direct Current (HVDC) cable and detecting a partial discharge signal of the HVDC cable; and
A shielding band disposed along the outer peripheral surface of the sensor unit and the HVDC cable to block external noise flowing into the sensor unit
HVDC cable partial discharge measurement sensor comprising a.
According to claim 1,
The sensor unit, HVDC cable partial discharge measurement sensor, characterized in that the contact-type inductive sensor.
According to claim 1,
The shielding band is
a first insulating layer disposed at the outermost;
a shielding layer disposed under the first insulating layer and to which eddy current shielding and magnetic flux shielding are applied; and
HVDC cable partial discharge measurement sensor, characterized in that it comprises a second insulating layer disposed under the shielding layer.
4. The method of claim 3,
An eddy current shielding material and a magnetic flux shielding material are embedded in the shielding layer,
The eddy current shielding material is formed of a highly conductive metal material, the HVDC cable partial discharge measuring sensor, characterized in that the magnetic flux shielding material is formed of a ferromagnetic material.
According to claim 1,
The shielding band, HVDC cable partial discharge measurement sensor, characterized in that the wearable shielding band.
6. The method of claim 5,
The shielding band, HVDC cable partial discharge measurement sensor, characterized in that the detachable member for attaching and detaching both ends is formed.
7. The method of claim 6,
The detachable member is an HVDC cable partial discharge measuring sensor, characterized in that the adhesive tape.
In the method of attaching the HVDC cable partial discharge measurement sensor to the HVDC (High-Voltage Direct Current) cable,
fixing the sensor unit to a predetermined position of the HVDC cable;
disposing a shielding band along an outer circumferential surface of the sensor unit and the HVDC cable; and
Connecting both ends of the shielding band
HVDC cable partial discharge measurement sensor attachment method comprising a.

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