KR102685793B1 - Apparatus for inspecting insulator - Google Patents

Abstract

The present invention discloses an insulator inspection device. The insulator inspection device of the present invention includes a test voltage generator that generates a test voltage and applies it to the insulator string; An inspection signal measuring unit that processes the detection voltage measured from the insulator to which the test voltage is applied through the test voltage generator and measures an inspection signal for insulator inspection; A control unit that applies a test voltage to the insulator through a test voltage generator, receives the inspection signal measured from the inspection signal measurement unit, detects the insulation resistance and shared voltage of the insulator, and determines the state of the insulator; It is characterized by including an output unit that outputs the decision result from the control unit.

Description

Insulator inspection device {APPARATUS FOR INSPECTING INSULATOR}

The present invention relates to an insulator inspection device, and more specifically, to an insulator inspection device that can identify defective insulators by precisely measuring shared voltage and insulation resistance while maintaining the high voltage of the insulator in a live state.

Generally, insulators are used to support high-voltage lines such as transmission, substation, distribution lines, and subway lines while maintaining insulation from the high-voltage lines.

These insulators are deteriorating and corroding due to various environmental and mechanical factors. The main causes are damage caused by long-term mechanical stress, lightning strikes, and rapid temperature changes, which cause damage to the metal and porcelain of the insulator. Therefore, the development of a reliable condition assessment method is very important for smooth power supply and demand, proper maintenance of transmission and distribution towers, and prevention of damage to citizens.

Methods for detecting defective insulators in a live state include the shared voltage measurement method, noise propagation measurement method, ultrasonic measurement method, and the live wire Megger method that directly measures insulation resistance.

The shared voltage measurement method detects bad insulators by measuring the shared voltage applied to the insulator. There are neon lamp and electric field methods. The noise propagation measurement method detects bad insulators by detecting high frequency (radio frequency) noise generated from bad insulators. This is a method, and the ultrasonic measurement method is a method of detecting delinquent insulators by detecting the location of ultrasonic waves generated in the delinquent insulators.

Among these methods, the electric field method is commonly used, but it is difficult to quantify the criteria for detecting bad insulators, and it is known to be unreliable, with no significant difference in output when the insulator insulation resistance is over 300MΩ.

The background technology of the present invention is disclosed in Republic of Korea Patent Publication No. 10-0668952 (2007.01.12 notice, live wire insulator tester).

Meanwhile, the Megger method is a method of directly measuring insulation resistance in a live state.

The Megger method, which directly measures insulation resistance in a live state, is generally a method of accurately detecting faulty insulators, but has several technical limitations.

In other words, there is a problem in that the voltage range that can determine whether a live wire insulator is defective is limited, or the range that can measure insulation resistance is limited, making it difficult to measure the value of a signal that exceeds the measurement range.

The present invention was created to improve the problems described above, and the purpose of the present invention is to accurately measure the shared voltage and insulation resistance while maintaining the high voltage of the insulator in a live state to identify a defective insulator. It provides an insulator inspection device.

An insulator inspection device according to one aspect of the present invention includes a test voltage generator that generates a test voltage and applies it to the insulator string; An inspection signal measuring unit that processes the detection voltage measured from the insulator to which the test voltage is applied through the test voltage generator and measures an inspection signal for insulator inspection; A control unit that applies a test voltage to the insulator through a test voltage generator, receives the inspection signal measured from the inspection signal measurement unit, detects the insulation resistance and shared voltage of the insulator, and determines the state of the insulator; and an output unit that outputs the decision result from the control unit.

In the present invention, the test voltage generator includes a high voltage generator that generates a high voltage using the test voltage; And a first resistor unit that applies the high voltage generated by the high voltage generator to the insulator.

In the present invention, the first resistor unit includes: a first resistor intermediate between the insulator and the high voltage generator; and a first capacitor intermediate between the first resistor and the insulator and ground.

In the present invention, the inspection signal measuring unit includes a second resistor unit used to measure the detection voltage from the insulating circuit; A signal buffer that receives the detection voltage measured through the second resistance unit; A signal separator that separates the direct current component and the alternating current component of the detected voltage input through the signal buffer and generates a trigger signal; A signal measurement unit that measures the insulator inspection signal from the direct current component and alternating current component separated in the signal separation unit; and an interrupt generation unit that generates an interrupt based on the trigger signal generated from the signal separation unit and applies it to the signal measurement unit.

In the present invention, the second resistor unit is characterized in that it includes a fourth resistor that is connected to ground between the insulator and the signal buffer.

In the present invention, the signal buffer includes a first amplifier that receives the measured voltage from the second resistor through a fifth resistor and amplifies it; And a second capacitor connected to ground between the first amplifier and the fifth resistor.

In the present invention, the signal separation unit includes a direct current voltage generator that separates the direct current component from the detected voltage measured through a signal buffer and generates a first inspection signal; an AC voltage generator that separates the AC component from the detected voltage measured through a signal buffer and generates a second inspection signal; And a timing generator that generates a trigger signal to generate an interrupt used when measuring a signal in the signal measurement unit.

In the present invention, the direct current voltage generator includes a second amplifier that receives the measured voltage from the signal buffer through a seventh resistor and amplifies the direct current voltage; And a fourth capacitor connected to ground between the second amplifier and the seventh resistor.

In the present invention, the AC voltage generator includes a third amplifier that receives the measured voltage from a signal buffer through a third capacitor and amplifies the AC voltage; And a sixth resistor connected to ground between the third amplifier and the third capacitor.

The insulator inspection device according to one aspect of the present invention maintains the high voltage of the insulator in a live wire state, determines whether the live wire insulator is defective at an arbitrary voltage, and expands the range of measuring the insulation resistance of the insulator to precisely determine the shared voltage. By measuring insulation resistance and considering signal phase distortion, defective insulators can be identified, thereby improving the reliability of the detection work of defective insulators.

1 is a block diagram showing an insulator inspection device according to an embodiment of the present invention.
Figure 2 is a circuit diagram showing main parts of an insulator inspection device according to an embodiment of the present invention.
Figure 3 is a circuit diagram showing the flow of an alternating current signal for measuring the shared voltage of an insulator in an insulator inspection device according to an embodiment of the present invention.
Figure 4 is a circuit diagram showing the flow of a direct current signal for measuring the insulation resistance of an insulator in an insulator inspection device according to an embodiment of the present invention.
Figure 5 is a circuit diagram for analyzing phase distortion in an insulator inspection device according to an embodiment of the present invention.

Hereinafter, an insulator inspection device according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Figure 1 is a block diagram showing the insulator inspection device according to an embodiment of the present invention, Figure 2 is a circuit diagram showing main parts of the insulator inspection device according to an embodiment of the present invention, and Figure 3 is a circuit diagram showing the main parts of the insulator inspection device according to an embodiment of the present invention. A circuit configuration diagram according to the flow of an alternating current signal for measuring the shared voltage of an insulator in an insulator inspection device according to an embodiment of the present invention, and Figure 4 is a circuit diagram for measuring the insulation resistance of an insulator in an insulator inspection device according to an embodiment of the present invention. It is a circuit diagram according to the flow of a direct current signal, and Figure 5 is a circuit diagram for analyzing phase distortion in an insulator inspection device according to an embodiment of the present invention.

As shown in Figures 1 and 2, the insulator inspection device according to an embodiment of the present invention includes a test voltage generation unit 20, an inspection signal measurement unit 30, a control unit 40, and an output unit 50. It can be included.

The test voltage generator 20 generates a test voltage and applies it to the insulator chain to measure the insulation resistance and shared voltage of the insulator.

Here, the test voltage generator 20 includes a high voltage generator 220 that generates a high voltage as the test voltage and a first resistor portion 210 that applies the high voltage generated by the high voltage generator 220 to the insulator 10. can do.

In addition, the first resistor unit 210 is intermediate between the insulator 10 and the high voltage generator (V1) and is connected to the first resistor (R1) and the first resistor (R1) and the insulator to prevent damage from a short circuit between lines. It may include a first capacitor C1 that is interposed between the strings 10 and ground to prevent malfunction due to noise.

The inspection signal measuring unit 30 separates a signal containing information on insulation resistance and shared voltage from the detection voltage measured from the insulator 10 to which the test voltage is applied through the test voltage generating unit 20, and processes the signal. , you can measure the inspection signal for insulator inspection by generating a trigger signal to determine the signal acquisition timing.

Here, the inspection signal measurement unit 30 may include a second resistance unit 310, a signal buffer 320, a signal separation unit 330, a signal measurement unit 340, and an interrupt generation unit 350.

The second resistance unit 310 is used to measure the detection voltage from the insulator 10, and may include a fourth resistor R4 that is connected to the ground between the insulator 10 and the signal buffer 320. there is.

The signal buffer 320 receives the detection voltage measured from the insulator 10 through the second resistor unit 310.

Here, the signal buffer 320 includes a first amplifier (AMP1) that receives the measured voltage from the second resistor unit 310 through the fifth resistor (R5) and amplifies it, and the first amplifier (AMP1) and the fifth resistor. It may include a second capacitor (C2) connected to ground between (R5).

The signal separator 330 may separate the direct current component and the alternating current component of the detected voltage measured through the signal buffer 320 and generate a trigger signal.

Here, the signal separation unit 330 may include a direct current voltage generator 332, an alternating current voltage generator 334, and a timing generator 336.

The DC voltage generator 332 may generate a first inspection signal by separating the DC component from the detected voltage measured through the signal buffer 320.

At this time, the DC voltage generator 332 receives the measured voltage from the signal buffer 320 through the seventh resistor R7 and amplifies the DC voltage, including a second amplifier (AMP2) and a second amplifier (AMP2). 7. It may include a fourth capacitor (C4) connected to ground between the resistors (R7).

The AC voltage generator 334 may generate a second inspection signal by separating the AC component from the detected voltage measured through the signal buffer 320.

At this time, the AC voltage generator 334 receives the measured voltage from the signal buffer 320 through the third capacitor C3 and amplifies the AC voltage, including a third amplifier (AMP3) and a third amplifier (AMP3). 3 It may include a sixth resistor (R6) connected to ground between the capacitors (C3).

Additionally, the timing generator 336 may generate a trigger signal to generate an interrupt used when the signal measurement unit 340 measures a signal.

The signal measurement unit 340 can measure the insulator inspection signal from the direct current component and the alternating current component separated by the signal separator 330 and measure the insulator inspection signal based on an interrupt according to the trigger signal.

The interrupt generator 350 may generate an interrupt based on the trigger signal generated by the signal separator 330 and apply it to the signal measurement unit 340 to measure the signal.

The control unit 40 applies a test voltage to the insulator string 10 through the test voltage generator 20 and then receives the inspection signal generated from the inspection signal measurement unit 30 to determine the insulation resistance of the insulator string 10 and the The status of the insulator can be determined by detecting the shared voltage.

The output unit 50 outputs the determination result from the control unit 40 to check the state of the insulator.

Here, the insulator 10 is modeled as a second resistor (R2) connected to the test voltage generator 20 and a third resistor (R3) connected to the inspection signal measurement unit 30, as shown in FIG. It may be composed of an insulation resistance (Rx) and a shared voltage (V2) that models the voltage shared by the insulator 10.

Therefore, when checking the insulator 10 in a live state, the voltage applied to Vm1 is the AC signal applied by the shared voltage (V2) and the V1 voltage applied from the test voltage generator 20 to measure the insulation resistance. appears overlapping, and the inspection signal measurement unit 30 generates an interrupt starting from the trigger signal to measure all signals, and thus the inspection signals of the AC signal and DC signal can be measured.

Here, the shared voltage can be measured using the AC signal of the inspection signal, and the insulation resistance can be measured using the DC signal.

Figure 3 is a circuit diagram showing the flow of an alternating current signal for measuring the shared voltage of an insulator in an insulator inspection device according to an embodiment of the present invention.

As shown in Figure 3, in order to expand the input range of the insulator inspection device, designing an alternating current signal (shared voltage supported by the insulator) is essential.

Here, the range of signals that the microprocessor of the control unit 40 can accept is from 0 to Avcc. Therefore, it is assumed that the AC signal can swing up to AVCC/2-0.1V on both sides starting from the voltage of AVCC/2 for swing. In that case, if the gain of the third amplifier (AMP3) before the input to the control unit 40 is set to G, the maximum range of voltage that can be had at the Vm2 position becomes Vswing/G. At this time, the voltage that Vm1 can have is as follows.

Vm1=Vswing/G*(R5+X2)/X2, where X2=1/(jwC2), w=60Hz

To calculate the voltage (Vinac) generated in Vm1 due to Vm1 and V2, excluding the impedance due to R1 and C1, the voltage applied to Vm1 due to V2 is

Vinac=R4∥(R5+X2)/(R4∥(R5+X2)+R2+R3)*V2

At this time, if Vm > Vinac, the insulator inspection device according to this embodiment becomes stable when measuring the shared voltage of the insulator.

When V2 and Avcc are determined under these conditions, the input range of the shared voltage of the insulator of the insulator inspection device can be expanded by determining the values of R2 and R3.

Figure 4 is a circuit diagram showing the flow of a direct current signal for measuring the insulation resistance of an insulator in an insulator inspection device according to an embodiment of the present invention.

As shown in FIG. 4, the direct current voltage in the insulator inspection device is a voltage applied from the test voltage generator 20 in the insulator inspection device, and can measure the insulating magnetic field of the insulator string 10.

Here, the range of signals that the microprocessor of the control unit 40 can accept is from 0 to Avcc. At this time, if the DC voltage change is determined based on the reference voltage, Vspan=AVCC/2-0.1V. At this time, Vm1 by DC voltage is as follows.

Vm1=Vspan/Gdc

At this time, the current I4 flowing through R4 and the voltage (V4) across R4 are as follows.

I4=V1/(R1+R2+R3+R4+Rx)

V4=R4*I4

Here, the point at which I4 becomes the maximum is the same as the point at which Rx becomes the minimum, so if Rx is set to 0, the maximum value of V4 is as follows.

V4=R4/(R1+R2+R3+R4)*V1

Therefore, in the following cases, the direct current voltage for measuring the insulation resistance of the insulator string 10 in the insulator inspection device according to this embodiment is stable.

Vspan/G > V4

At this time, the maximum value that V1 can have is as follows.

V1=Vspan*(R1+R2+R3+R4)/(Gdc*R4)

When Vinac, R2, R3, and R4 that satisfy these conditions are determined, the optimal DC power value for the insulator inspection device is given as follows.

Figure 5 is a circuit diagram for analyzing phase distortion in an insulator inspection device according to an embodiment of the present invention.

As shown in FIG. 5, the phase value at the final output stage is calculated based on the model for phase analysis of the insulator inspection device according to this embodiment.

Therefore, this phase value distortion can be compensated for and used when analyzing AC signals.

As described above, according to the insulator inspection device according to an embodiment of the present invention, the range is capable of determining whether a live wire insulator is defective and measuring the insulation resistance of the insulator at an arbitrary voltage while maintaining the high voltage of the insulator in a live wire state. By expanding it, it is possible to precisely measure shared voltage and insulation resistance and identify bad insulators by taking signal phase distortion into consideration, making it possible to design insulator inspection modules that used to rely on experience in a formal manner, and to determine optimal resistance and power values. Not only can it be selected, but the accuracy of shared voltage measurement can be improved by analyzing the phase distortion part when inspecting insulators, thereby improving the reliability of the detection work of defective insulators.

Implementations described herein may be implemented, for example, as a method or process, device, software program, data stream, or signal. Although discussed only in the context of a single form of implementation (eg, only as a method), implementations of the features discussed may also be implemented in other forms (eg, devices or programs). The device may be implemented with appropriate hardware, software, firmware, etc. The method may be implemented in a device such as a processor, which generally refers to a processing device that includes a computer, microprocessor, integrated circuit, or programmable logic device. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants (“PDAs”) and other devices that facilitate communication of information between end-users.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will recognize that various modifications and other equivalent embodiments are possible therefrom. You will understand.

Therefore, the true technical protection scope of the present invention should be determined by the claims below.

10: insulator 20: test voltage generator
30: Inspection signal measuring unit 40: Control unit
50: output unit 210: first resistor unit
220: high voltage generator 310: second resistance unit
320: signal buffer 330: signal separation unit
332: DC voltage generator 334: AC voltage generator
336: Timing generator 340: Signal measurement unit
350: Interrupt generation unit

Claims (9)

a test voltage generator that generates a test voltage and applies it to the insulator;
an inspection signal measuring unit that processes the detection voltage measured from the insulator to which the test voltage is applied through the test voltage generator and measures an inspection signal for insulator inspection;
A control unit that applies a test voltage to the insulator through the test voltage generator, receives the inspection signal measured from the inspection signal measurement unit, detects the insulation resistance and shared voltage of the insulator, and determines the state of the insulator; and
Includes an output unit that outputs the decision result from the control unit,
The inspection signal measuring unit,
a second resistance unit used to measure the detection voltage from the insulator;
a signal buffer that receives the detection voltage measured through the second resistance unit;
a signal separator that separates a direct current component and an alternating current component of the detected voltage input through the signal buffer and generates a trigger signal;
A signal measuring unit that measures an insulator inspection signal from the direct current component and the alternating current component separated by the signal separation unit; and
An interrupt generation unit that generates an interrupt based on the trigger signal generated from the signal separation unit and applies it to the signal measurement unit,
The second resistance unit is an insulator inspection device characterized in that it includes a fourth resistor that is connected to ground between the insulator chain and the signal buffer.
The method of claim 1, wherein the test voltage generator,
A high voltage generator that generates a high voltage as a test voltage; and
An insulator inspection device comprising a first resistor unit that applies the high voltage generated by the high voltage generator to the insulator chain.
The method of claim 2, wherein the first resistor unit is:
a first resistor intermediate between the insulator and the high voltage generator; and
An insulator inspection device comprising a first capacitor intermediate between the first resistor and the insulator and ground.
delete delete The method of claim 1, wherein the signal buffer is:
a first amplifier that receives the measured voltage from the second resistor through a fifth resistor and amplifies it; and
An insulator inspection device comprising a second capacitor connected to ground between the first amplifier and the fifth resistor.
The method of claim 1, wherein the signal separation unit,
a direct current voltage generator that separates the direct current component from the detected voltage measured through the signal buffer and generates a first inspection signal;
an AC voltage generator that separates the AC component from the detected voltage measured through the signal buffer and generates a second inspection signal; and
A timing generator that generates a trigger signal to generate an interrupt used when measuring a signal in the signal measurement unit.
The method of claim 7, wherein the direct current voltage generator,
a second amplifier that receives the measured voltage from the signal buffer through a seventh resistor and amplifies the direct current voltage; and
An insulator inspection device comprising a fourth capacitor connected to ground between the second amplifier and the seventh resistor.
The method of claim 7, wherein the alternating voltage generator,
a third amplifier that receives the measured voltage from the signal buffer through a third capacitor and amplifies the alternating current voltage; and
An insulator inspection device comprising a sixth resistor connected to ground between the third amplifier and the third capacitor.

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