CN1955749A - Broadband UHF partial discharge signal and pattern generator - Google Patents

Abstract

The invention discloses a broad band UHF local discharge signal and graphics generator. The generator comprises: a commercial power phase synchronization sensor which is connected to an inductive power phase synchronization sensor, a capacitive phase synchronization sensor, and a power phase synchronization sensor used for sensing light quantity radiated from an electrical lamp; a rectangle pulse generator connected to the commercial power synchronization sensor and designed for inputting and controlling patterns; a pulse type controller designed for reducing the rise time and the fall time of the pulse; a capacitor designed for removing DC component of a signal controlled by the pulse type controller to reduce the the rise time and the fall time of the pulse; a high pass filter designed for filtering the high frequency of AC component of the signal to generate UHF; a signal amplifier and attenuator designed for outputting a signal which has a size set by the rectangle pulse generator; and a directional coupler designed for measuring the size of the signal outputted from the signal amplifier and attenuator.

Description

Broadband UHF partial discharge signal and pattern generator

Cross References to Related Applications

This non-provisional application claims priority from Patent Application No. 10-2005-101192 filed in Korea on October 26, 2005, the entire contents of which are incorporated herein by reference.

technical field

The present invention relates to a high-voltage power device, and in particular to a broadband ultra-high frequency (UHF) partial discharge signal and pattern generator, which can be achieved by connecting a sensor or a simulated signal and pattern generator to a measuring instrument rather than to a high-voltage The partial discharge generator is used to perform the sensitivity and performance test of the measuring instrument, and it is possible to perform the measurement test of the UHF partial discharge or the defect type judgment test of the monitoring system by using the stored partial discharge pattern, and it can be easily used during the manufacturing process of the measuring instrument used in testing.

Background technique

Partial discharges occur in high voltage power equipment such as gas insulated switchgear (GIS), gas insulated transformers, oil immersed transformers, gas insulated transmission lines, power cables and rotary devices as a mechanical fault signal. Likewise, if partial discharge occurs in high-voltage power equipment, the UHF partial discharge measuring instrument measures ultra-high frequency (UHF) generated together with partial discharge, analyzes the signal type and pattern of the measured UHF and diagnoses whether partial discharge occurs and power equipment Whether it is degraded, so that the failure of power equipment can be measured or identified in advance.

So far, by using real partial discharge generators or precision measuring instruments, UHF partial discharge measurement devices have been subjected to general performance tests such as tests during the manufacturing process, operation tests and correction tests after the completion of the manufacturing process, and partial discharge reason inferred.

Fig. 1 shows a configuration diagram of a conventional real partial discharge generator and a UHF partial discharge measuring instrument.

Referring to FIG. 1 , if high voltage power equipment 110 such as GIS, transformers, rotating equipment, transmission lines and cables all applied with high voltage AC power 100 fails internally, partial discharge occurs in the high voltage power equipment 110 as a failure signal.

At this time, the UHF partial discharge measuring instrument 140 receives the partial discharge signal 150 detected by the partial discharge sensor 120 installed in the high voltage power device 110 via the coaxial transmission line 130 to measure and analyze the received partial discharge signal 150 . Likewise, the partial discharge signal 150 input via the coaxial transmission line 130 is a broadband signal with a duration of tens of nanoseconds.

When measured continuously for a long time, the partial discharge signal 150 is periodically or irregularly generated according to the phase of the applied voltage, and thus a special partial discharge signal pattern 210 appears according to the defect type as shown in FIG. 2 .

If the signal pattern 220 is enlarged for a period of time, the partial discharge pulse signal 230 occurring during tens to hundreds of nanoseconds can be observed for the phase of the applied voltage of the particular partial discharge signal pattern 210 . The partial discharge pulse signal 230 is a broadband ultra-high frequency signal of several hundred MHz to several GHz in the frequency domain 240 after Fourier transform.

The signal acquisition circuit in the UHF partial discharge measurement instrument 140 includes different types of amplifiers, signal attenuators, detection means and neural networks for signal classification, allowing analysis of the partial discharge signal 150 .

By analyzing the shape of the partial discharge signal 150 , it is possible to diagnose whether a partial discharge occurs and the deterioration state of the high voltage power device 110 , and to measure or identify a fault signal in the high voltage power device 110 in advance based on the diagnosis.

Also, for testing using the UHF partial discharge measuring instrument 140 according to the conventional method, the partial discharge generator 160 is installed in the high voltage power device 110 so that UHF partial discharge can be generated by applying the high voltage power 100 .

Testing with a UHF partial discharge measuring instrument installed inside the available equipment is almost impossible because the measuring instrument can only test when a partial discharge generator is installed in the available equipment.

For the measurement of a real partial discharge generator, it is necessary to install a partial discharge sensor 120 and a large-sized high voltage generator.

Meanwhile, the test using the UHF partial discharge measuring instrument 140 may be performed by using a combination of two or more precision high frequency measuring instruments instead of a real partial discharge generator.

Likewise, the precision high frequency measuring instruments used to test the UHF partial discharge measuring instrument 140 are bulky and expensive because of the different measuring instruments to be connected to be operated by a dedicated controller.

Conventionally, a high-frequency signal generator, a pulse generator, and a spectrum analyzer, each controlled using an integrated controller, are connected to each other. Therefore, the UHF partial discharge measuring instrument 140 can only be tested by using the integrated controller.

Therefore, in order to test the performance of the UHF partial discharge measuring instrument 140, a different high-priced measuring instrument is required. Therefore, it is very difficult to test the performance in the outdoor field where the device is installed and operated.

Furthermore, in order to perform performance testing and verification of the UHF partial discharge measuring instrument 140, a lot of time and expense are required.

Contents of the invention

Therefore, the present invention has been made to solve the above-mentioned problems existing in the prior art, and an object of the present invention is to provide a broadband UHF partial discharge signal and pattern generator, which can To the input port of the measuring instrument instead of connecting to the high-voltage partial discharge generator to perform the sensitivity and performance test of the measuring instrument, it is possible to perform the measurement test of UHF partial discharge or the defect type judgment test of the monitoring system by using the stored partial discharge pattern , and can be easily used in testing during the manufacturing process of the measuring instrument.

Another object of the present invention is to provide a broadband UHF partial discharge signal and pattern generator capable of performing an operational check, test or calibration of a UHF partial discharge measuring instrument by generating a signal and a signal pattern such as a broadband partial discharge signal, so The broadband partial discharge signal mentioned above is detected by the sensor and input to the input port of the measuring instrument when the UHF partial discharge measuring instrument is manufactured, tested, installed and maintained.

Yet another object of the present invention is to provide a broadband UHF partial discharge signal and pattern generator capable of generating signal patterns synchronously or asynchronously with the phase of the voltage applied to the high voltage partial discharge generator and UHF The basic measurement function (ie, sensitivity) of a partial discharge measuring instrument to test the signal analysis function of an on-line or off-line system.

Yet another object of the present invention is to provide a broadband UHF partial discharge signal and pattern generator capable of testing the broadband detection performance of UHF partial discharge measuring instruments in the range from 300 to 3000 MHz, and verifying the operation and discharge pattern of the entire system .

Yet another object of the present invention is to provide a broadband UHF partial discharge signal and pattern generator which can be easily portable and small in size and thus capable of calibrating measuring instruments and verifying the performance of measuring instruments at the workplace or factory.

Other advantages, objects and features of the present invention will be described in the following description, and will become apparent to those of ordinary skill in the art after reviewing the following, or can be understood from the practice of the present invention.

In one aspect of the present invention there is provided a broadband UHF partial discharge signal and pattern generator comprising: a power connected to an inductive power phase synchronous sensor, a capacitive power phase synchronous sensor and a power A commercial power phase synchronous sensor for a phase synchronous sensor; a rectangular pulse generator connected to a commercial power synchronous sensor and used for input and control pattern; a pulse type controller for reducing the rise time and fall time of the pulse; A capacitor for the direct current (DC) component of the signal controlled by the controller to shorten the rise and fall times; a high-pass filter for filtering the high frequency component of the alternating current (AC) of the signal to produce UHF; a signal amplifier and attenuator for signals of magnitude set by the generator; and a directional coupler for measuring the magnitude of the signal output from the signal amplifier and attenuator.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent with reference to the following detailed description taken in conjunction with the accompanying drawings, in which:

Fig. 1 shows the construction diagram of a traditional real partial discharge generator and a UHF partial discharge measuring instrument;

Fig. 2 shows a schematic diagram of a signal input to a UHF partial discharge measuring instrument and its graph after being measured by a conventional partial discharge sensor;

FIG. 3 shows a construction diagram of a broadband UHF partial discharge signal and pattern generator according to an exemplary embodiment of the present invention;

Figure 4 shows an example of a signal output from a broadband UHF partial discharge signal and pattern generator according to an exemplary embodiment of the present invention; and

FIG. 5 shows an example of a signal pattern output from a broadband UHF partial discharge signal and pattern generator according to an exemplary embodiment of the present invention.

Detailed ways

Many aspects and features of the present invention and methods for achieving the aspects and features will become apparent by referring to the embodiments described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. Matters defined in the specification, such as detailed construction and elements, are merely specific details provided to assist those of ordinary skill in the art in a comprehensive understanding of the invention, and limit the invention only within the scope of the appended claims. Throughout the description of the present invention, the same reference numerals are used to denote the same elements in different drawings.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 3 shows a configuration diagram of a broadband UHF partial discharge signal and pattern generator according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the broadband UHF partial discharge signal and pattern generator includes a commercial power phase synchronization sensor connected to an inductive power phase synchronization sensor 381, a capacitive power phase synchronization sensor 382, and a power phase synchronization sensor for sensing the amount of light irradiated from a lamp 383. Sensor 380, connected to commercial power phase synchronous sensor 380 and used for input and control pattern rectangular pulse generator 310, pulse type controller 320 for reducing the rise time and fall time of the pulse, for removing pulse type controller 320 Direct current (DC) component of the signal 321 controlled to shorten the rise and fall times Capacitor 330 for filtering the high frequency of the alternating current (AC) component of the signal to produce UHF High pass filter 340 for output having A signal amplifier and attenuator 350 for a signal 361 whose magnitude is set by the pulse generator 310 , and a directional coupler 360 for measuring the magnitude of a signal 361 output from the signal amplifier and attenuator 350 .

The operation of the broadband UHF partial discharge signal and pattern generator according to the exemplary embodiment of the present invention will be explained below.

If a signal similar to the signal measured by the sensor installed in the power device is supplied to the partial discharge measuring device via the coaxial transmission line 130, the power device 110, the partial discharge generator 160, and the high voltage power shown in FIG. 1 are not required. 100.

The rectangular pulse generator 310 generates a pulse signal 311 to provide the generated pulse signal to the pulse type controller 320 .

The pulse type controller 320 performs control to shorten rising and falling times, thereby generating a signal 321 . The DC component of signal 321 is removed while passing through capacitor 330 . Only the AC 331 component of signal 321 is provided to high pass filter 340 .

AC 331 passes through high pass filter 340 to form UHF band signal 341 . The resulting UHF band signal 341 is provided to a signal amplifier and attenuator 350 . FIG. 4 shows a partial signal 420 of the UHF band signal 341 .

The signal amplifier and attenuator 350 outputs a signal 361 having a magnitude set by the rectangular pulse generator 310 through the directional coupler 360 .

The magnitude of the signal 361 output from the signal amplifier and attenuator 350 is measured through the directional coupler 360 and input back to the rectangular pulse generator 310 .

The rectangular pulse generator 310 controls the signal amplifier and attenuator 350 using the control signal 312 so that the output signal 361 has the same magnitude as set by the rectangular pulse generator 310 .

Signals generated by particular defects are stored in memory 390 . The user selects the signal to input the selected signal to the rectangular pulse generator 310, if desired. The rectangular pulse generator 310 outputs the input signal as a signal pattern 510 .

To synchronize the period and phase of the feedback signal 351 from the directional coupler 360 with the power phase of the UHF partial discharge measurement instrument 140, the rectangular pulse generator 310 receives a phase signal from a commercial power synchronization sensor 380 or a power supply.

FIG. 4 shows an example of a signal 420 output by pulse modulation 410 according to a signal pattern 510 input from memory 390 to rectangular pulse generator 310 . If one of several pulses is amplified in the time domain by one period, a signal 430 that persists for tens to hundreds of nanoseconds can be observed. If the signal 430 is observed in the frequency domain 440 after Fourier transformation, the signal 430 is a broadband UHF signal ranging from hundreds of MHz to several GHz.

FIG. 5 shows some examples of partial discharge simulation signals output from the broadband UHF signal pattern generator shown in FIG. 3 .

The partial discharge signal pattern stored in memory 390 may use measured data or artificial data. The data type becomes different according to the defects 530, 540, 550, and 560, thereby causing partial discharge. The partial signal 520 of the partial discharge simulation signal 510 has a pulse waveform.

As mentioned above, since the signal and its pattern such as the broadband UHF partial discharge signal measured by the UHF partial discharge sensor are generated, the present invention connects the simulation signal and pattern generator to the sensor of all UHF partial discharge measuring instruments instead of connecting to High voltage partial discharge generators can be used for testing during the equipment manufacturing process, performance testing during its installation and operational testing. In particular, the simulation signal and pattern generator can be manufactured in a small size to be operated by a battery and thus can be used at the workplace.

The broadband UHF partial discharge signal and pattern generator according to the present invention has the following effects.

Simulation of signal and pattern generators connected to measuring instruments or sensors other than to high-voltage partial discharge generators for sensitivity testing or performance testing of measuring instruments, UHF partial discharge measurements or monitoring system defects using stored partial discharge patterns Type judgment tests are readily used in tests as well as during the manufacturing process of measuring instruments.

The preferred embodiment of the present invention has been described for illustrative purposes, and those skilled in the art will appreciate that various modifications, additions and and replace. Accordingly, the scope of the present invention should be defined by the appended claims and their legal equivalents.

Claims (4)

1. A broadband UHF partial discharge signal and pattern generator, comprising: A commercial power phase synchronous sensor connected to an inductive power phase synchronous sensor, a capacitive power phase synchronous sensor, and a power phase synchronous sensor for sensing the amount of light irradiated from an electric lamp; Rectangular pulse generators connected to commercially available power synchronous sensors and designed for input and control patterns; Pulse-type controllers designed to reduce the rise and fall times of pulses; Capacitors designed to remove the DC component of signals controlled by pulse-type controllers to shorten the rise and fall times of the pulses; High-pass filters designed to filter the high frequencies of the AC component of the signal to produce ultra-high frequencies; a signal amplifier and attenuator designed to output a signal having a magnitude set by a rectangular pulse generator; and Directional couplers designed to measure the magnitude of signals output from signal amplifiers and attenuators. 2. The broadband UHF partial discharge signal and pattern generator according to claim 1, wherein the rectangular pulse generator generates a broadband UHF signal having a length in the range of tens to hundreds of nanoseconds pulse. 3. The broadband ultra-high frequency partial discharge signal and pattern generator according to claim 1, characterized in that the signal generator is generated by performing pulse width modulation from the typical defect pattern input by the user and stored in the memory. Graph of the output signal. 4. The broadband ultra-high frequency partial discharge signal and pattern generator according to claim 1, characterized in that, by combining the internal clock such as commercial power frequency or the electric field induced by commercial power with the input of electrostatic and inductive coupling sensors or Signal synchronization of an optical signal sensor for sensing changes in the amount of light irradiated from an electric lamp, generating a signal and a signal pattern having a function of a phase angle variation according to a signal generated and output from a signal generator.

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