KR101181713B1 - The apparatus and method of hybrid partial discharge detector - Google Patents

Abstract

PURPOSE: A hybrid PC detector for electric power change and distribution and an electric power changing and distributing facility PD(Partial Discharge) diagnosis method using the same are provided to improve measuring accuracy of an electric power changing and distributing facility by measuring surface partial discharge and internal partial discharge at once with a hybrid structure. CONSTITUTION: A supersonic wave type PD measuring module emits supersonic waves on the surface of an electric power changing and distributing facility. The supersonic wave type PD measuring module senses partial discharge of the surface and transfers it to a main control unit. An electromagnetic wave type PD measuring module sends electromagnetic wave pulses from the surface of the electric power changing and distributing facility to an internal direction. The electromagnetic wave type PD measuring mod senses internal partial discharge and transfers it to the main control unit. A first external connector is combined with an external mike by a pin. A second external connector(70) is combined with an external parabola dish by the pin. The main control unit selects the supersonic wave type PD measuring module or the electromagnetic wave type PD measuring module according to an input signal selected in a key input unit. The main control unit stores a sensing value of the partial discharge of the surface and the internal partial discharge and outputs the sensing value in a display unit.

Description

Hybrid PD detector for substation and distribution, and diagnostic method for substation and distribution facilities through the same. {THE APPARATUS AND METHOD OF HYBRID PARTIAL DISCHARGE DETECTOR}

In the present invention, through the hybrid structure of the ultrasonic PD detection module + electromagnetic wave PD detection module, the sub-distribution and distribution that can detect the surface partial discharge and the internal partial discharge of the substation and distribution facilities at a time by a single device in a hybrid structure. The present invention relates to a hybrid PD detector and a PD diagnosis method for a substation and distribution facility.

Transmission system for power transmission (Power System) is a transmission or substation that transmits electricity from a power plant to a large-scale use, such as a city, is installed power equipment including a transformer using a high pressure and a special high pressure (100,000 volts or more).

Such electric power facilities cause insulation deterioration due to mechanical stress, temperature, etc., which causes local partial discharge in the internal insulation part, and this partial discharge phenomenon occurs continuously for a long time even if there is no problem in the performance and operation of the system. In this case, the degree of insulation deterioration increases due to the oxide generated during the electric tree and the partial discharge.

Such insulation deterioration may cause the power equipment to stop functioning, and in extreme cases, it may lead to an explosion, causing a problem such as a power failure (shutdown). This paralyzing fatal situation will occur.

In order to prevent this problem in advance, various methods have been taken. As a method for measuring and diagnosing the insulation deterioration state of a power plant in real time, ultrasonic sensors are mounted on the outer wall of the power plant and installed as a detection device installed outside the power plant. It was used by connecting through each sensor cable. The reason for using the ultrasonic sensor is to detect the partial discharge signal generated by the insulation deterioration of the power equipment.

However, in the case of a power equipment diagnosis system, a diagnostic system for diagnosing a partial discharge signal caused by insulation deterioration from a live power facility is equipped with a plurality of ultrasonic sensors for detecting a partial discharge phenomenon on the exterior wall of the power equipment. Since the sensor is connected to the diagnosis system through a coaxial cable, there is a problem that there is always a risk of an electric accident due to leakage current when the operator diagnoses the insulation deterioration characteristics of the power equipment in an environment using high pressure or extra high pressure.

In addition, the ultrasonic sensor for detecting the partial discharge of the surface can detect physical quantities such as electromagnetic waves, ultrasonic waves, partial discharge charges, etc., which occur when the partial discharge occurs, but it is difficult to find the location of the discharge.

In addition, the partial discharge detector through the ultrasonic sensor can estimate the position of the partial discharge generated on the surface by the ultrasonic wave, but the output of the sensor is weak, it is impossible to accurately detect the occurrence position of the partial discharge generated inside, and to prevent this In order to carry a separate internal partial discharge detector while carrying a problem.

1. Domestic Publication No. 10-2008-0030185 (published 04/04/2008) 2. Domestic Patent Publication No. 10-1040110 (June 09, 2011)

In order to achieve the above object, in the present invention, the TV remote control is made slim and easy to carry, and the surface partial discharge and the internal partial discharge of the transformation / distribution facility can be detected at a time by a hybrid structure with a single device. Time and cost can be reduced, measured and databased at regular intervals, and based on this data, the analysis of trends in deterioration status of substation and distribution facilities, and maintenance based on the State Standards Law, It is possible to minimize the damage, and above all, through the hybrid structure of the ultrasonic PD detection module + electromagnetic wave PD detection module, hybrid PD detector for substation and distribution, which can improve the measurement accuracy of substation and distribution equipment, compared to the existing one. Its purpose is to provide PD diagnosis method through substation and distribution facilities through power supply.

Hybrid PD detector for substation and distribution according to the present invention to achieve the above object

Partial discharge (PD) of the surface is sensed by shooting ultrasonic waves on the surface of substation and distribution facilities, and electromagnetic waves are flowed inward from the surface of the substation and distribution facilities to generate partial discharge (PD). The hybrid structure is configured to sense and is configured to display the sensing values of the surface partial discharge and the internal partial discharge on the screen.

The hybrid PD detector for substation and distribution

PD detector body (10) consisting of a slim rectangular shape having a TV remote control size, to protect each device from external pressure,

A display unit 20 positioned at one side of the upper center of the PD detector body to display sensing values of the surface partial discharge and the internal partial discharge on the screen;

A key input unit 30 which is located at the bottom of the display unit and transmits an input signal (Input) selected for the function and operation of each device to the main controller;

Ultrasonic wave is formed inside one side of the tip head of PD detector body and inside PD detector body to detect partial discharge of PD by transmitting ultrasonic wave to the surface of substation and distribution equipment, and then deliver it to main controller. PD detection module 40,

It is formed on the other end of the PD detector body and inside the PD detector body, and flows electromagnetic wave pulses inward from the surface of substation and distribution equipment to sense internal partial discharge (PD), and then the main control unit. Electromagnetic wave PD detection module 50 to be transmitted to

Located inside the rear end of the PD detector body, the charge battery unit for supplying power to each device,

A first external connection connector 60 positioned at one side of the PD detector body and pin-coupled with an external microphone,

A second external connection connector 70 positioned at one side of the first external connection connector and pin-coupled with an external parabolic dish;

Controls the overall operation of each device, hybrid control by switching any one of the ultrasonic PD detection module and the electromagnetic wave PD detection module is selected according to the input signal selected by the key input unit, the ultrasonic PD detection module and the electromagnetic wave PD detection It is characterized in that the main control unit 80 for controlling the display to display on the display after storing the sensing value of the surface partial discharge and the internal partial discharge sensed by the module.

In addition, the PD diagnosis method of the substation and distribution facility through the hybrid PD detector for substation and distribution according to the present invention

The electromagnetic wave pulse of the electromagnetic wave PD detection module is located in the substation / distribution facility and the short distance (1m to 3m) and flows electromagnetic pulses toward the substation / distribution facility. Detecting the discharge (S10),

Measuring the background noise level of the substation and distribution facility (S20);

Detecting the partial discharge of the surface of the substation and distribution equipment through the ultrasonic PD detection module (S30);

Measuring the internal partial discharge of the substation and distribution equipment through the electromagnetic wave PD detection module (S40);

Determining an alarm level mode according to the ultrasonic sensor output voltage of the ultrasonic PD detection module and the TEV sensor output voltage of the electromagnetic wave PD detection module through an alarm level discrimination unit of the main controller (S50);

Expressing the ultrasonic sensor output voltage of the ultrasonic PD detection module, the TEV sensor output voltage of the electromagnetic wave PD detection module, and the alarm level mode by the main controller (S60);

It is achieved by the step (S70) of searching for the surface partial discharge position and the internal partial discharge position of the substation distribution system through the hybrid locator.

As described above, in the present invention, the TV remote control is made slim and easy to carry, and it is possible to detect the surface partial discharge and the internal partial discharge of the substation / distribution facility in a single structure at a time by using a single device. It is possible to reduce the cost and cost, and to prevent safety accidents such as the electric shock of the operator due to high voltage or extra high voltage current, which can occur during wiring work. By analyzing trends of deterioration status of power distribution facilities and maintenance by the State Standards Act, it is possible to minimize human and physical damages caused by accidents of power distribution and distribution facilities. Compared with the existing one, it is possible to improve the measurement accuracy of substation and distribution facilities by 70%.

1 is a perspective view showing the configuration of a hybrid PD detector 1 for substation and distribution according to the present invention;
2 is a front view of the hybrid PD detector 1 for substation and distribution according to the present invention;
Figure 3 is a full exploded perspective view showing the components of the hybrid PD detector (1) for substation and distribution according to the present invention,
4 is a block diagram showing the components of the ultrasonic PD detection module 40 according to the present invention,
5 is a block diagram showing the components of the electromagnetic wave PD detection module 50 according to the present invention,
Figure 6 is an embodiment showing that the external microphone 71 is pin-coupled to the first external connection connector according to the present invention,
Figure 7 is an embodiment showing that the outer parabola plate 81 is pin-coupled to the second external connection connector according to the present invention,
Figure 8 is an embodiment showing the configuration of a hybrid locator 100 according to the present invention,
Figure 9 is an embodiment showing the detection of the partial discharge of the surface of the power distribution equipment through the ultrasonic PD detection module 40 according to the present invention,
Figure 10 is an embodiment showing that the outer parabola plate 81 is pin-coupled to the second external connection connector according to the present invention to detect the surface partial discharge of the power distribution equipment from a distance,
11 is a diagram illustrating an external partial discharge expression mode displayed on a display unit according to the present invention;
12 is a diagram illustrating an internal partial discharge expression mode displayed on a display unit according to the present invention;
Figure 13 is an embodiment showing the operation of the hybrid PD detector for substation and distribution consisting of the ultrasonic PD detection module 40 according to the present invention,
14 is an embodiment showing the operation of the hybrid PD detector for substation and distribution consisting of the electromagnetic wave PD detection module 50 according to the present invention,
15 is an embodiment showing the components of the TEV sensor unit according to the present invention,
Figure 16 is located in the substation and distribution facility and the short distance (1m to 3m) using the electromagnetic wave pulse of the electromagnetic wave PD detection module according to the present invention, the electromagnetic wave pulse flows toward the substation and distribution facility, the first substation and distribution facility. In one embodiment, showing the detection of partial discharge (PD) of,
17 is a flowchart illustrating a method for diagnosing PD of a substation and distribution facility through a hybrid PD detector for substation and distribution according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing the configuration of the hybrid PD detector 1 for substation and distribution according to the present invention, and FIG. 2 is a front view of the hybrid PD detector 1 for substation and distribution according to the present invention. 3 is a total exploded perspective view showing the components of the hybrid PD detector for substation and distribution according to the present invention, which is a partial discharge (PD) of the surface by shooting ultrasonic waves on the surface of the substation and distribution facility. : It is composed of hybrid structure to sense Partial Discharge and flow electromagnetic wave pulse inward from the surface of substation and distribution equipment to sense PD (Partial Discharge). It serves to express the sensing value of the discharge.

The hybrid PD detector 1 for substation and distribution includes a PD detector body 10, a display unit 20, a key input unit 30, an ultrasonic PD detection module 40, and an electromagnetic wave PD detection module 50. The rechargeable battery unit 60 includes a first external connection connector 70, a second external connection connector 80, and a main controller 90.

First, the PD detector body 10 according to the present invention will be described.

The PD detector body 10 has a slim rectangular shape having a TV remote control size, and serves to protect each device from external pressure.

The storage frame is formed to accommodate the display unit, the ultrasonic PD detection module, the electromagnetic wave PD detection module, the charging battery unit, and the main control unit therein.

And, the PD detector body according to the present invention is manufactured by extrusion molding with excellent durability and insulation,

20 to 70wt% of Thermoplastic Polyurethane,

10-50 wt% of Thermoplastics Elastomer,

10 to 45 wt% of Thermoplastics Polystyrene,

It is prepared by extrusion molding a mixture composed of a mixture of thermoplastic polyolefin (Thermoplastics Polyolefin) 10 ~ 45wt%.

More specifically, a resin mixture composed of 30 wt% of thermoplastic polyurethane, 20 wt% of thermoplastic elastomer, 15 wt% of thermoplastic polystyrene, and 35 wt% of thermoplastic polypropylene may be used for the screw of the extruder. The L / D (length / diameter ratio) is 28 to 32: 1, and the compression ratio is extrusion molded in the range of 2.5 to 3.0.

The thermoplastic polyurethane has excellent mechanical strength and abrasion resistance, and has excellent properties in flex resistance, colorability, and texture. When the thermoplastic polyurethane is less than 20 wt%, durability may be reduced, resulting in damage to the product, and 70 wt% If it exceeds, the moldability may be reduced, the amount of the thermoplastic polyurethane (Thermoplastic Polyurethane) is preferably limited within the range of 20 to 70wt% based on the total mixture.

The thermoplastic elastomer (Thermoplastics Elastomer) is used to increase the moldability, when the amount of use is less than 10wt%, the moldability is inferior, if it exceeds 45wt%, the durability may be reduced, the thermoplastic elastomer (Thermoplastics Elastomer ) Is preferably used in the range of 10 to 45wt% based on the total mixture.

When the amount of the polystyrene (Thermoplastics Polystyrene) is less than 10wt% there is a relatively uneconomical problem to increase the cost of the use of other components relatively, if the amount exceeds 45wt%, the characteristics of the article such as durability rapidly Since there is a problem falling, the amount of the polystyrene (Thermoplastics Polystyrene) is preferably limited to within the range of 10 ~ 45wt% of the total mixture.

The thermoplastic polyolefin (Thermoplastics Polyolefin) is the lightest plastic having a low coefficient of friction and excellent durability, heat resistance, chemical resistance and non-toxic and transparent properties, high density polyethylene, ultra high density polyethylene, low density polyethylene, ultra low density polyethylene, linear low density polyethylene , At least one selected from polypropylene and ethylene vinyl acetate resin is used.

If the capacity of the thermoplastic polyolefin is less than 10wt%, the durability of the product is lowered, and if it exceeds 45wt%, the moldability of the product may be deteriorated, so the amount of the thermoplastic polyolefin (Thermoplastics Polyolefin) is used in an amount of 10 to It is preferable to limit in the range of 45 wt%.

Next, the display unit 20 according to the present invention will be described.

The display unit 20 is located on one side of the upper center of the PD detector body, and serves to express sensing values of the surface partial discharge and the internal partial discharge on the screen.

It consists of an external partial discharge mode display unit and an internal partial discharge mode display unit.

As shown in FIG. 11, the external partial discharge mode display unit is an ultra mode, in which a dB measurement value display unit is formed at the center, a two-stage bar graph is formed at one side of the dB measurement value display unit, and the lower end of the dB measurement value display unit. An amplification factor adjusting section and a volume setting section are formed.

And, as a setting mode, the user can adjust, and the dB measurement value display section that can display red / green immediately according to the alarm level is formed, and the amplification factor adjustment (Gain) and the store & exit unit at the bottom of the dB measurement value display unit Is formed.

As shown in FIG. 12, the internal partial discharge mode display unit is a TEV mode, and a dB measurement value display unit is formed at the center, and a three-stage bar consisting of a good step, a attention step, and a precision inspection request step on one side of the dB measurement value display part. A graph is formed, and a graphic display unit is formed at the bottom of the dB measurement display to display the magnitude of the signal, the number of pulses per cycle, and the severity value.

In the pulse mode, a dB measurement value display section is formed at the center, and the number of pulses, pulses per cycle, and severity are formed at the bottom of the dB measurement value display section.

Next, the key input unit 30 according to the present invention will be described.

The key input unit 30 is located at the bottom of the display unit to deliver an input signal (Input) selected for the function and operation of each device to the main controller.

It consists of front and rear left and right selection button, OK setting button, power on / off selection button, Ultra mode and TEV mode selection button.

Next, the ultrasonic PD detection module 40 according to the present invention will be described.

The ultrasonic PD detection module 40 is formed at one end of the PD detector body and inside the PD detector body to sense partial discharge (PD) of the surface by shooting an ultrasonic wave on the surface of the substation and distribution facility. After that, it serves to deliver to the main control unit.

As shown in FIG. 4, the ultrasonic sensor unit 41, the first preamplifier unit 42, the first analog-to-digital converter (AD) converter 43, and the first microcomputer unit 44 are configured.

The ultrasonic sensor unit 41 is located on one side of the tip head of the PD detector body and serves to detect a partial discharge signal generated on the surface of the substation and distribution facility by shooting an ultrasonic wave on the surface of the substation and distribution facility.

It consists of an AE sensor with a bandpass filter band of 75 ~ 300 [kHz], center frequency 150 [kHz], and 40dB amplification.

The reason for this is that AE (Acoustic Emission) signal accompanying partial discharge is generally the most sensitive when detected in the range of 20 ~ 40 [kHz] in the air, about 10 [kHz] in the sound absorbing gas such as SF6. In a liquid such as a transformer insulating oil, it is desirable to select and detect a sensor having good sensitivity in the band of 30 to 300 [kHz], so the band pass filter band has a 75 to 300 [kHz], a center frequency of 150 [kHz], and a 40 dB amplification. It consists of AE sensor.

In addition, the AE sensor according to the present invention is configured to include a piezoelectric vibrator.

The piezoelectric vibrator serves to vibrate a portion of the medium at the same frequency as ultrasonic waves.

The piezoelectric effect is a phenomenon in which the positive and negative charges appear on both sides of the plate when pressure is applied to the both sides of the plate, and the opposite-signal charges appear on both sides of the plate. On the contrary, when a DC voltage is applied to both sides of the plate, the plate is compressed or expanded, which is called a piezoelectric adverse effect, and is used when used as a transmitter.

As described above, the ultrasonic sensor unit according to the present invention detects the partial discharge signal generated on the surface of the substation / distribution facility by shooting an ultrasonic wave on the surface of the substation / distribution facility through the piezoelectric effect and the piezoelectric reverse effect.

Alternatively, only the piezoelectric effect is used to detect the noise flowing out of the surface of the substation and distribution facility, that is, the background noise, and detect the partial discharge signal generated on the surface of the substation and distribution facility.

In the present invention, only the piezoelectric effect of the ultrasonic sensor unit detects the background noise flowing from the surface of the substation and distribution equipment.

The first preamplifier 42 amplifies the signal measured by the ultrasonic sensor unit.

It is configured to get 60dB of gain.

The first analog-to-digital converter (AD) converter 43 converts the analog amplified ultrasonic sensor output voltage output from the first preamplifier to digital.

The first microcomputer unit 44 receives the driving signal from the main control unit and is driven by the partial discharge mode using ultrasonic waves or when the electromagnetic wave PD detection module error occurs, in response to the emergency driving signal of the main control unit. After analyzing the digital signal of the ultrasonic sensor output voltage converted through the AD (Analog to Digital Converter) converter, it controls to convert to dB in the preset dB conversion table, and controls the operation of each device.

It consists of the PIC16C711 one-chip microcomputer.

That is, the first AD (Analog to Digital Converter) converter is connected to one side of the input terminal to receive the surface partial discharge detection signal converted into a digital signal, and the output terminal of the main controller is connected to one side of the other input terminal. Receives a driving signal and emergency drive signal from the control unit to drive each device of the ultrasonic PD detection module, and an input terminal of the main control unit is connected to one output terminal, and converted to dB in a preset dB conversion value table. It is configured to output the ultrasonic sensor output voltage value to the main control unit.

The first microcomputer unit according to the present invention includes a first signal analyzer and a first dB conversion value table.

The first signal analyzer analyzes the digital signal of the ultrasonic sensor output voltage converted through the first analog to digital converter (AD) converter and converts the digital signal into dB in the preset first dB conversion value table.

The first dB conversion table serves to preset and store the dB value according to the ultrasonic sensor output voltage.

Next, the electromagnetic wave PD detection module 50 according to the present invention will be described.

The electromagnetic wave PD detection module 50 is formed at the other end of the head of the PD detector body and inside the PD detector body, and flows electromagnetic wave pulses inward from the surface of the substation / distribution facility. After sensing Partial Discharge), it delivers to main controller.

As shown in FIG. 5, this includes a TEV sensor unit 51, a second preamplifier unit 52, a second AD (Analog to Digital Converter) converter 53, and a second microcomputer unit 54.

The TEV (Transient Earth Voltage) sensor unit 51 is located on one side of the ultrasonic sensor located at one end of the PD detector body, and flows electromagnetic wave pulses inward from the surface of the substation and distribution equipment. It plays a role of sensing PD (Partial Discharge).

As shown in FIG. 15, the copper coil is wound around the ferrite core, and is configured to be covered by a rectangular cover cover on the outside.

In the present invention is formed to form a horseshoe type excellent in the concentration characteristics of the cylindrical and magnetic field is configured to improve the measurement sensitivity of the sensor.

The second preamplifier 52 amplifies the signal measured by the TEV sensor unit.

It is configured to get 60dB of gain.

The second analog-to-digital converter (AD) converter 53 converts the analog amplified TEV sensor output voltage output from the second preamplifier to digital.

The second microcomputer 54 receives the drive signal from the main controller and is driven by an internal partial discharge mode using electromagnetic wave pulses or is driven immediately by an emergency drive signal of the main controller when an ultrasonic PD detection module error occurs. 2 Analyzes digital signal of TEV sensor output voltage converted through AD (Analog to Digital Converter) converter and converts it to dB in preset dB conversion table and controls the operation of each device. .

It consists of the PIC16C711 one-chip microcomputer.

That is, a second AD (Analog to Digital Converter) converter is connected to one input terminal to receive an internal partial discharge detection signal converted into a digital signal, and an output terminal of the main control unit is connected to one input terminal, and the main control unit is connected. It receives the drive signal and emergency drive signal from the controller to control each device of the electromagnetic wave PD detection module, and the input terminal of the main control unit is connected to one output terminal, and converted to dB in the preset dB conversion value table. It is configured to output the TEV sensor output voltage to the main controller.

The second microcomputer unit according to the present invention includes a second signal analyzer and a second dB conversion value table.

The second signal analyzer plays a role of converting the digital signal of the TEV sensor output voltage converted through the second analog to digital converter (AD) converter into dB in a preset second dB conversion table.

The second dB conversion table serves to preset and store the dB value according to the TEV sensor output voltage.

This is shown in Table 1 below.

dB mV dB mV dB mV dB mV 0 1.00 20 10.0 40 100 60 1000 One 1.12 21 11.2 41 112 61 1120 2 1.26 22 12.6 42 126 62 1260 3 1.41 23 14.1 43 141 63 1410 4 1.58 24 15.8 44 158 64 1580 5 1.78 25 17.8 45 178 65 1780 6 2.00 26 20.0 46 200 66 2000 7 2.24 27 22.4 47 224 67 2240 8 2.51 28 25.1 48 251 68 2510 9 2.82 29 28.2 49 282 69 2820 10 3.16 30 31.6 50 316 70 3160 11 3.55 31 35.5 51 355 71 3550 12 3.98 32 39.8 52 398 72 3980 13 4.47 33 44.7 53 447 73 4470 14 5.01 34 50.1 54 501 74 5010 15 5.62 35 56.2 55 562 75 5620 16 6.31 36 63.2 56 638 76 6320 17 7.08 37 70.8 57 708 77 7080 18 7.94 38 79.4 58 794 78 7940 19 8.91 39 89.1 59 891 79 8910

In Table 1, the dB conversion value of TEV sensor output voltage is calculated by setting dB value = 20log [mV]. And dB = dBmV.

And, dB according to the EMP measurement distance is shown in Table 2 below.

EMP measuring distance (d) dBmV 1m 32 dB 2m ~ 6m 32-31 dB 7m ~ 8m 30-29 dB 9m ~ 10m 32-28 dB 11m 27-26 dB 12 ~ 13m 23 dB

In addition, the electromagnetic wave PD detection module 50 according to the present invention uses electromagnetic wave pulses, and does not directly contact the substation / distribution facility in which high current flows in the substation / distribution facility PD diagnosis method. It is located at, and is configured to quantify partial discharge (PD) of primary substation / distribution equipment by sending electromagnetic wave pulses to substation / distribution equipment.

At this time, if the numerical value of the primary PD through the electromagnetic wave PD detection module 50 is greater than or equal to the reference set value, the surface contact is directly made with the substation and distribution equipment to be detected. It is configured to sense internal partial discharge of secondary substation and distribution equipment.

Next, the charge battery unit 60 according to the present invention will be described.

The rechargeable battery unit 60 is located inside the rear end of the PD detector body, and serves to supply power to each device.

It consists of a lithium ion polymer battery.

Next, the first external connection connector 70 according to the present invention will be described.

The first external connection connector 70 is located at one side of the PD detector body, and serves to pin-couple with an external microphone.

This is a detector assist device, as shown in Figure 6, is pin-coupled with the external microphone 71 to measure the noise of the substation / distribution facility, and then transfer the measured value to the main control unit.

The first external connection connector according to the present invention is connected to one side of the input terminal of the main control unit.

Next, the second external connection connector 80 according to the present invention will be described.

The second external connection connector 80 is located at one side of the first external connection connector, and serves to be pin-coupled with the external parabolic dish.

This is a detector assist device, as shown in Fig. 7 and 10, by pinned to the external parabolic dish 81 to shoot the ultrasonic wave at a position 2m ~ 10m away from the substation and distribution facility through which high pressure flows. And to check for surface partial discharge.

The second external connection connector according to the present invention is connected to one side of the input terminal of the main control unit.

Further, in the present invention, in addition to the first and second external connection connectors, a third external connection connector is formed to pin-couple the headphone connection jack to the third external connection connector.

Here, the headphone is combined with the ultrasonic PD detection module, the external microphone, and the external parabola plate, and serves to output the background noise of the substation and distribution equipment so as to hear crackling, crackling, and sizzling sounds.

Next, the main control unit 90 according to the present invention will be described.

The main controller 90 controls the overall operation of each device, hybrid control by switching any one of the ultrasonic PD detection module and the electromagnetic wave PD detection module is selected according to the input signal selected by the key input unit. It stores the sensing values of the surface partial discharge and the internal partial discharge sensed by the detection module and the electromagnetic wave PD detection module and controls them to be displayed on the display unit.

It consists of the PIC16C711 one-chip microcomputer.

That is, a key input unit is connected to one side of the input terminal, an input signal selected by the key input unit is input, and an output terminal of the first microcomputer unit of the ultrasonic PD detection module is connected to one side of another input terminal, and converted into dB. A voltage is input, the output terminal of the second microcomputer of the electromagnetic wave PD detection module is connected to the other input terminal, and the TEV sensor output voltage converted into dB is input, and the output terminal is connected to the first terminal of the ultrasonic PD detection module. The input terminal of the microcomputer unit is connected, and outputs the driving signal and the emergency drive signal to the first microcomputer unit of the ultrasonic PD detection module, and the input terminal of the second microcomputer unit of the electromagnetic wave PD detection module is connected to one output terminal, Outputs the drive signal and the emergency drive signal to the second microcomputer of the PD detection module, the display is connected to one output terminal, the ultrasonic PD detection Is configured to output the ultrasonic sensor output voltage and the TEV sensor output voltage of the electromagnetic wave detection-type PD module of the module.

In addition, the main control unit according to the present invention includes an external partial discharge mode and an internal partial discharge mode.

The external partial discharge mode is an ultra mode, and drives an ultrasonic PD detection module to send a command signal to sense a partial discharge (PD) of the surface by shooting an ultrasonic wave on the surface of the substation and distribution facility.

The internal partial discharge mode is a TEV mode, which drives the electromagnetic wave PD detection module to send an electromagnetic wave pulse inward from the surface of the substation and distribution facility to sense a partial discharge (PD) inside. It plays a role of sending.

In addition, the main control unit according to the present invention includes an alarm level discrimination unit for determining an alarm level mode according to the ultrasonic sensor output voltage of the ultrasonic PD detection module and the TEV sensor output voltage of the electromagnetic wave PD detection module.

This is expressed as shown in Table 3.

No TEV value and pulse count Alarm level measure One Less than 20dB
Less than 50 pulses Noise Level Mode Low level. Regular inspection required every year 2 20dB or more
Or more than 50 pulses Caution mode Periodic observation required, monitoring of changes 3 Less than 30dB ~ 50dB Warning mode Requires further investigation. Identify discharge sources,
Use hybrid locator, partial discharge monitor to check position and change of partial discharge 4 50dB or more Bad Mode Check discharge source and check or replace 5 More than 1000 pulses Caution mode Electromagnetic background noise may be coming from the area. If it is 20dB or more, install a partial discharge monitor to check external electromagnetic activity.
If the number of pulses is high, it may be due to surface discharge. In this case, it is recommended to measure with ultrasonic PD detection module.

In addition, the present invention includes a hybrid locator 100 for connecting the two to 10 hybrid PD detector (1) for substation and distribution for searching the surface partial discharge position and the internal partial discharge position of the substation distribution system. do.

In the present invention, a description will be given based on the configuration of two hybrid PD detectors 1 for substation and distribution.

As illustrated in FIG. 8, the hybrid locator 100 includes a locator terminal 110 and a plurality of hybrid PD detectors 1 for power transmission and distribution.

The hybrid locator 100 according to the present invention displays a pulse and a severity per cycle, and is applied to the ultrasonic PD detection module to detect the internal surface partial discharge, partial discharge generated in the distribution (cable) using RFCT It detects temperature, measures non-contact temperature, analyzes ambient temperature and humidity, and stores data.

Hereinafter, the PD diagnosis method of the substation and distribution facility through the hybrid PD detector for substation and distribution according to the present invention will be described.

First, as shown in FIG. 16, by using electromagnetic wave pulses of the electromagnetic wave PD detection module, the electromagnetic wave pulses are flown toward the substation and distribution facility and located at a short distance (1m to 3m), and the primary power is converted. Detection of partial discharge (PD) of the distribution equipment (S10).

Next, the background noise value of the substation and distribution facility is measured (S20).

It consists of a headphone + external microphone and a headphone + external parabolic dish to measure the background noise of substation and distribution equipment.

The headphone + external microphone is pin-coupled to a third external connection connector on one side of the PD detector body, and the external microphone is pin-coupled to the first external connection connector, and is spaced 2 m to 10 m from a power distribution and distribution facility. In this position, the background noise of the substation and distribution system is measured through the headphones + external microphone.

The headphone + external parabola plate is pin-coupled to a third external connection connector on one side of the PD detector body, and an external parabola plate is pin-coupled to a second external connection connector, and the substation and distribution facility is 2m ~. The background noise of substation and distribution equipment is measured through headphone + external parabolic dish at 10m apart.

The reason for measuring the background noise of the substation / distribution facility in the present invention is to distinguish the background noise value from the numerical value of the surface partial discharge through the ultrasonic PD detection module.

Next, the partial discharge of the surface of the substation distribution system is detected through the ultrasonic PD detection module (S30).

As shown in FIG. 13, the ultrasonic wave is shot on the surface of the substation / distribution facility to sense partial discharge (PD) of the surface.

In other words, a pin is coupled to the third external connection connector on one side of the PD detector body, and the PD detector body is configured to be set to Ultra mode, which is an external partial discharge display mode, and is located close to the substation and distribution equipment. (Example: 5cm ~ 10cm) Check the external partial discharge value displayed on the display while listening to headphones with noise such as "sizzling, cracking, cracking, warming" of the substation and distribution equipment.

Next, the internal partial discharge of the substation distribution system is measured through the electromagnetic wave PD detection module (S40).

As shown in FIG. 14, the electromagnetic wave pulse flows inward from the surface of the substation / distribution facility in direct contact with the substation / distribution facility to sense a partial discharge (PD) therein.

Next, the alarm level mode is discriminated according to the ultrasonic sensor output voltage of the ultrasonic PD detection module and the TEV sensor output voltage of the electromagnetic wave PD detection module through the alarm level discrimination unit of the main controller (S50).

As shown in Table 3, if the TEV value is less than 20 dB and the number of pulses is less than 50, it is determined as a noise level mode. If the TEV value is more than 20 dB and the number of pulses is more than 50, it is determined as a caution mode. If the value is less than 30dB ~ 50dB, it is determined as a warning mode. If the TEV value is more than 50dB, it is determined as a bad mode.

Next, the main control unit displays the ultrasonic sensor output voltage of the ultrasonic PD detection module, the TEV sensor output voltage of the electromagnetic wave PD detection module, and the alarm level mode (S60).

At this time, the operator visually checks the appearance of the substation and distribution facility once again.

Finally, the surface partial discharge position and the internal partial discharge position of the substation distribution system are searched through the hybrid locator (S70).

1: Hybrid PD detector for substation and distribution
10: PD detector body 20: display unit
30: key input unit 40: ultrasonic type PD detection module
50: electromagnetic wave PD detection module 60: charging battery unit
70: first external connection connector 80: second external connection connector
90: main control unit

Claims (6)

Partial discharge (PD) of the surface is sensed by shooting ultrasonic waves on the surface of substation and distribution facilities, and electromagnetic waves are flowed inward from the surface of the substation and distribution facilities to generate partial discharge (PD). A hybrid PD detector for substation and distribution, comprising a hybrid structure for sensing and expressing sensing values of surface partial discharge and internal partial discharge on a screen.
The hybrid PD detector of claim 1, wherein the substation-distribution hybrid PD detector
PD detector body 10 formed of a rectangular shape to protect each device from external pressure,
A display unit 20 positioned at one side of the upper center of the PD detector body to display sensing values of the surface partial discharge and the internal partial discharge on the screen;
A key input unit 30 which is located at the bottom of the display unit and transmits an input signal (Input) selected for the function and operation of each device to the main controller;
Ultrasonic wave is formed inside one side of the tip head of PD detector body and inside PD detector body to detect partial discharge of PD by transmitting ultrasonic wave to the surface of substation and distribution equipment, and then deliver it to main controller. PD detection module 40,
It is formed on the other end of the PD detector body and inside the PD detector body, and flows electromagnetic wave pulses inward from the surface of substation and distribution equipment to sense internal partial discharge (PD), and then the main control unit. Electromagnetic wave PD detection module 50 to be transmitted to
Located inside the rear end of the PD detector body, the charge battery unit for supplying power to each device,
A first external connection connector 60 positioned at one side of the PD detector body and pin-coupled with an external microphone,
A second external connection connector 70 positioned at one side of the first external connection connector and pin-coupled with an external parabolic dish;
Controls the overall operation of each device, hybrid control by switching any one of the ultrasonic PD detection module and the electromagnetic wave PD detection module is selected according to the input signal selected by the key input unit, the ultrasonic PD detection module and the electromagnetic wave PD detection A hybrid PD detector for substation and distribution, comprising: a main controller 80 for storing the surface partial discharge sensed by the module and the sensing values of the internal partial discharge and then displaying them on the display unit.
According to claim 2, wherein the ultrasonic PD detection module 40
An ultrasonic sensor unit 41 positioned on one side of the tip head of the PD detector body to detect a partial discharge signal generated on the surface of the substation and distribution facility by shooting an ultrasonic wave on the surface of the substation and distribution facility;
A first preamplifier 42 for amplifying the signal measured by the ultrasonic sensor unit;
A first analog-to-digital converter (AD) converter 43 for converting an analog amplified ultrasonic sensor output voltage output from the first preamplifier into digital;
When the surface partial discharge mode using ultrasonic waves is received or the electromagnetic wave PD detection module error is received by the drive signal of the main controller, the first AD (Analog to Digital Converter) converter is directly driven according to the emergency drive signal of the main controller. After analyzing the digital signal of the ultrasonic sensor output voltage converted through the control, it is converted to dB in the preset dB conversion table, characterized in that it comprises a first microcomputer unit 44 for controlling the operation of each device Hybrid PD detector for substation and distribution.
The method of claim 2, wherein the electromagnetic wave PD detection module 50
TEV sensor unit located on one side of the ultrasonic sensor located on one side of the head of the PD detector body to sense the partial discharge (PD) by sending electromagnetic wave pulses inward from the surface of the substation and distribution equipment With 51,
A second preamplifier 52 which amplifies the signal measured by the TEV sensor unit;
A second analog-to-digital converter (AD) converter 53 for converting an analog amplified TEV sensor output voltage output from the second preamplifier into digital;
A second AD (Analog to Digital Converter) converter is directly driven according to the emergency drive signal of the main control unit when the internal partial discharge mode using the electromagnetic wave pulse or the ultrasonic PD detection module error is received by receiving the drive signal from the main control unit. After analyzing the digital signal of the TEV sensor output voltage converted through the control, and converted to dB in the preset dB conversion value table, it characterized in that it comprises a second microcomputer unit 54 for controlling the operation of each device Hybrid PD detector for substation and distribution.
The electromagnetic wave pulse of the electromagnetic wave PD detection module is located in the substation / distribution facility and the short distance (1m to 3m) and flows electromagnetic pulses toward the substation / distribution facility. Detecting the discharge (S10),
Measuring the background noise level of the substation and distribution facility (S20);
Detecting the partial discharge of the surface of the substation and distribution equipment through the ultrasonic PD detection module (S30);
Measuring the internal partial discharge of the substation and distribution equipment through the electromagnetic wave PD detection module (S40);
Determining an alarm level mode according to the ultrasonic sensor output voltage of the ultrasonic PD detection module and the TEV sensor output voltage of the electromagnetic wave PD detection module through an alarm level discrimination unit of the main controller (S50);
Expressing the ultrasonic sensor output voltage of the ultrasonic PD detection module, the TEV sensor output voltage of the electromagnetic wave PD detection module, and the alarm level mode by the main controller (S60);
Substation and distribution facility PD diagnostic method using a hybrid PD detector for substation and distribution, characterized in that the step (S70) of searching the surface partial discharge position and the internal partial discharge position of the substation distribution system through a hybrid locator.
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