KR20140132262A - Apparatus and method for generating synchronous signal used to detect partial discharge - Google Patents

Abstract

The present invention relates to a device for producing a synchronous signal for partial discharge detection and a method thereof. The device detects a signal of a frequency component corresponding to a commercial frequency of power supplied to an electronic device from a signal generated from inside or outside the electronic device according to a motion of the electronic device. The device produces a signal having a property which is synchronized to the commercial frequency by correcting a wave of the detected signal and is converted. The device outputs a signal which is produced according to a successive congruence degree between a cycle calculated by the operation of the signal and a cycle of the commercial frequency as the synchronous signal for the partial discharge detection of the electronic device.

Description

[0001] Apparatus and method for generating synchronous signal for partial discharge detection [0002]

And an apparatus and method for generating a synchronization signal for a partial discharge signal.

Power plants such as power plants and substations include various power devices such as generators, gas insulated switchgears, gas insulated transformers, and oil immersed transformers. Since a high-voltage current flows in such a power device, a partial discharge occurs as a precursor to the failure of the power device. In this way, if a partial discharge occurs in the power device, there is a possibility of reaching an insulation breakdown, and finally, the operation of the entire power equipment can be stopped. Therefore, it is essential to diagnose the partial discharge in advance to diagnose the occurrence of the partial discharge and take appropriate measures to prevent the failure of the power equipment.

On the other hand, in the conventional partial discharge diagnosis system, a sensor for detecting the partial discharge is installed in the power device, and the partial discharge signal detected by the partial discharge sensor is transmitted to the partial discharge signal processing device. Subsequently, the partial discharge signal processing apparatus detects the partial discharge based on the frequency phase of the voltage output from the voltage transformer (PT) installed in the power device. Since the partial discharge is characterized by the characteristics of each cause in synchronism with the frequency of the power supplied to the power device, it is possible to prevent the partial discharge from being generated in the partial discharge sensor in comparison with the reference synchronous signal synchronized with the frequency phase of the power source supplied to the power device To be displayed. The manager of the electric power facility determines from this indication whether the electric discharge is partial or not.

However, depending on the field conditions or operating conditions of the electric power facilities, there is a case where the signal source for generating such a synchronous signal does not exist or can not be used, and it has been difficult to judge whether or not a partial discharge occurs. In addition, the synchronous signal may be extracted from a commercial power supply supplied to the power equipment, but may not be supplied with commercial power. In addition, the frequency phase of the power supplied to the power equipment And the phase difference between the frequency phases of the commercial power supply, there is a problem that the partial discharge is not accurately detected.

There is provided an apparatus and method for generating a synchronous signal capable of more accurately detecting a partial discharge without a high voltage equipment such as a voltage transformer for extracting a synchronous signal as described above, a commercial power supply, or the like, or a signal source for generating a synchronous signal . The present invention is not limited to the above-described technical problems, and another technical problem may be derived from the following description.

According to an aspect of the present invention, there is provided an apparatus for generating a synchronization signal for detecting a partial discharge, the apparatus comprising: A signal detector for detecting a signal of a component; A signal generating unit for generating a signal having characteristics that are more synchronously changed with respect to the commercial frequency by correcting the wave of the signal detected by the signal detecting unit; And a signal generator for generating a signal generated by the signal generator according to a degree of consecutive coincidence between a period calculated by the operation of the signal generated by the signal generator and a period of the commercial frequency, As shown in FIG. Signals generated from the inside or outside of the power device may include a commutated frequency component due to at least one of a vibration of the inside or outside of the power device, a change in the magnetic field, and a change in the electric field.

And a sensor connection part for receiving a signal generated from the inside or the outside of the power device from at least one sensor attached to or connected to the power device. Wherein the at least one sensor comprises a sensor for converting the vibration of the power device itself into electrical energy, a sensor for converting a magnetic field change in the power device into electrical energy, And a coupling capacitor for converting a change in electric field caused by a current flowing in the power transmission line of the power device into electrical energy.

The power generation unit may further include a power unit that generates power using the electrical energy converted by the at least one sensor and supplies the generated power to the components of the apparatus for generating the partial discharge detection sync signal. Wherein the power unit generates power using the electrical energy converted by the at least one sensor and supplies the generated power to the components of the apparatus for generating the partial discharge detection synchronizing signal; And generating power by using the commercial power supplied from the power company when the amount of power consumed in the components of the apparatus for generating the partial discharge detection synchronizing signal exceeds the power amount of the power generated by the autonomous power source, And a commercial power source for supplying the generated power to the components of the apparatus for generating the partial discharge detecting synchronization signal.

The power supply unit charges the remaining power supplied to the components of the apparatus for generating the partial discharge detection synchronizing signal and supplies remaining power to the battery. When the power generation by the power supply unit is not possible, To the components of the device that generates the signal. The power generation unit may further include a power unit for generating power by using electric energy converted from solar energy by a solar cell and supplying the generated power to the components of the apparatus for generating the partial discharge detection synchronizing signal .

The signal detector may detect a signal of a frequency component corresponding to the commercial frequency by extracting and amplifying a frequency component corresponding to the commercial frequency from a signal generated inside or outside the power device. Wherein the signal detector comprises: a first filter for passing a low frequency band below the commercial frequency and for blocking the remaining high frequency bands from a signal generated inside or outside the power device; An amplifying unit amplifying a signal output from the first filter with a predetermined amplification degree; A second filter for passing a low frequency band below the commercial frequency and blocking the remaining high frequency bands from the signal amplified by the amplifier; And a variable amplification unit for amplifying the signal output from the second filter with an amplification degree that varies according to an average size of a signal output from the signal operation unit.

An integrator for correcting a distortion of a wave of a signal output from the signal detector by integrating a signal output from the signal detector according to a degree of distortion of a signal output from the signal calculator; And a synchronization signal comparing unit for generating a signal having a characteristic of being regularly changed in synchronization with the commercial frequency by comparing the signal output from the integrating unit and the signal fed back from the signal computing unit.

Wherein the signal generating unit further includes a wave correcting unit for calculating a time constant used for integrating a signal output from the signal detecting unit in accordance with a degree of distortion of a signal output from the signal calculating unit, The distortion of the wave of the signal output from the signal detecting unit can be corrected by integrating the signal output from the signal detecting unit using the time constant.

Wherein the signal operation unit calculates a period of the signal generated by the signal generation unit by calculating a signal generated by the signal generation unit, and when the difference between the calculated period and the period of the commercial frequency is within the reference range A synchronous signal generator for outputting a signal generated by the signal generator as a synchronous signal for partial discharge detection of the power device; And a comparison signal generation unit for generating a reference comparison signal in which the phase of the frequency of the signal output from the synchronization signal generation unit is fixed by correcting the phase of the frequency of the signal output from the synchronization signal generation unit based on the phase of the reference signal .

And a communication unit for transmitting the partial discharge detection synchronization signal output from the signal calculation unit to at least one other device and for receiving the partial discharge detection synchronization signal from the at least one other device, It is possible to generate the reference signal in accordance with the phase of the partial discharge detection synchronizing signal received via the signal line. The signal operation unit may further include a correction control unit that calculates a degree of distortion of the signal generated by the signal generation unit based on the operation result of the synchronization signal generation unit.

According to another aspect of the present invention, there is provided a method of generating a synchronization signal for detecting a partial discharge, the method comprising the steps of: generating a synchronization signal for detecting a partial discharge from a signal generated inside or outside of the power device, Detecting a signal of the component; Generating a signal having characteristics that are more synchronously and variably shifted to the commercial frequency by correcting the wave of the detected signal; And outputting the generated signal as a synchronizing signal for detecting partial discharge of the power device according to a degree of consecutive matching between the period calculated by the operation of the generated signal and the period of the commercial frequency.

A signal synchronized with a commercial frequency of a power source actually flowing in the power device can be generated by generating a synchronization signal for detecting a partial discharge from a signal generated inside or outside the power device according to the operation of the power device, So that the partial discharge generated in the power device can be detected more accurately. Also, the power source necessary for driving the apparatus for generating the partial discharge detection synchronizing signal can be obtained by converting the vibration of the power device, the change of the magnetic field, and the change of the electric field into electric energy using the energy harvesting technique So it is excellent in field application.

In addition, power supply can be supplied more stably by power supply redundancy that simultaneously operates the commercial power supply together with the autonomous power supply. In addition, since the autonomous power source and the battery for charging the spare power source in emergency can not be obtained from the commercial power source, power can be supplied even in an emergency, and partial discharge can be detected even in a non-power source environment in which the commercial power source is shut off. Further, since the synchronization signal for detecting the partial discharge is generated in accordance with the phase of the synchronization signal of the other apparatus, the phase difference of the synchronization signals generated by the various apparatuses can be corrected.

1 is a diagram illustrating an example in which various sensors are mounted on the power device 10 according to an embodiment of the present invention.
2 is a configuration diagram of an apparatus for generating a partial discharge detection sync signal according to an embodiment of the present invention.
3 is a diagram showing an example of an a signal output from the sensor connection unit 11 shown in Fig.
4 is a diagram showing an example of the b signal output from the variable amplification unit 15 shown in Fig.
5 is a diagram showing an example of a c signal output from the integrator 21 shown in Fig.
6 is a detailed configuration diagram of the synchronization signal comparison unit 22 shown in FIG.
7 is a diagram showing an example of the d signal output from the synchronizing signal comparator 22 shown in FIG.
8 is a detailed configuration diagram of the comparison signal generator 32 shown in FIG.
Fig. 9 is a configuration diagram of the power supply unit 5 shown in Fig.
Fig. 10 is a configuration diagram of the communication unit 4 shown in Fig.
FIG. 11 is a diagram showing a network environment in which devices and other devices shown in FIG. 2 are assembled and assembled.
12 is a flowchart of a method of generating a synchronization signal for detecting a partial discharge according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Partial discharge refers to a discharge occurring at a local part other than between the electrodes. Examples of the discharge include a corona discharge, a floating discharge, a particle discharge, a void discharge, void discharge, surface discharge, and the like. This is the cause of insulation breakdown of the power equipment, so it is used as an index to prevent the failure of the power equipment. The partial discharge has characteristics that are repeatedly generated every period of the commercial frequency of the power supplied to the power device. Thus, a signal that varies in synchronism with the commercial frequency of the power supply can be used to determine whether a partial discharge has occurred in the power supply. Embodiments of the present invention to be described below relate to an apparatus and method for generating a synchronous signal used for detecting such a partial discharge, wherein the synchronous signal may be a single-phase signal depending on whether the power source is a single-phase or three- Phase signal.

1 is a diagram illustrating an example in which various sensors are mounted on the power device 10 according to an embodiment of the present invention. Power plants such as power plants and substations include various power devices 10 such as a generator, a gas insulated switchgear, a gas insulated transformer, and an oil immersed transformer . FIG. 1 shows a generator as an example of the power device 10. As shown in FIG. When power is supplied to the power device 10 and the operation of the power device 10 is started, the power device 10 vibrates in synchronization with a commercial frequency of the power source and is supplied to the inside of the power device 10, A magnetic field and an electric field which are changed in synchronization with the frequency are generated. Such changes in vibration, magnetic field, and electric field appear as sinusoidal frequency components and can be converted into electrical energy using specific sensors. Generally, the commercial frequency is 50 Hz or 60 Hz.

For example, a vibration sensor 101 attached to the outside of the power device 10 converts the vibration of the power device 10 itself into electrical energy. An example of such a vibration sensor 101 is a piezoelectric transducer. A magnetic sensor 102 attached inside the power device 10 converts a magnetic field change inside the power device 10 into electrical energy. An example of such a magnetic sensor 102 is a hall sensor. An RFCT (Radio Frequency Current Transducer) 103 connected to the power line 10, that is, the ground line of the neutral point of the generator, converts the electric field change at the winding neutral point of the generator into electrical energy. A coupling capacitor 104 connected to the power transmission line of the power device 10 converts the electric field change caused by the current flowing in the power transmission line into electrical energy. Thus, the electrical energy generated by the various sensors has a wave that changes in synchronization with the commercial frequency of the high voltage flowing into the power device 10. [

As described above, the signal detected by the sensor, that is, the signal generated from the inside or the outside of the power device 10 in accordance with the operation of the power device 10, And a change in electric field. However, when power is supplied to the power device 10 having a nonlinear characteristic such as a generator or a transformer, noise in frequency components corresponding to an integral multiple of the sinusoidal wave form frequency is also applied to the inside or the outside of the power device 10 . Thus, the signal detected by the sensor may include other frequency components due to noise other than the common frequency component. The present embodiment removes frequency components other than the commercial frequency component from the signal output from the sensor connection section 11 and corrects the distortion of the signal due to the noise, in order to generate a synchronization signal to be used for detecting the partial discharge.

2 is a configuration diagram of an apparatus for generating a partial discharge detection sync signal according to an embodiment of the present invention. Referring to FIG. 2, the apparatus according to the present embodiment includes a signal detection unit 1, a signal generation unit 2, a signal calculation unit 3, a communication unit 4, and a power supply unit 5. The signal detecting unit 1 detects a signal of a frequency component corresponding to a commercial frequency of a power source supplied to the power device 10 from a signal generated in the power device 10 or in accordance with an operation of the power device 10 do. More specifically, the signal detection unit 1 extracts and amplifies a frequency component corresponding to a commercial frequency of a power source from a signal generated from the inside or outside of the power device 10, thereby generating a signal of a frequency component corresponding to the commercial frequency . The signal detection unit 1 includes a sensor connection unit 11, a first filter 12, an amplification unit 13, a second filter 14, a variable amplification unit 15, and an amplification control unit 16 ).

The sensor connection unit 11 receives signals generated inside or outside the power device 10 according to the operation of the power device 10 from at least one sensor attached to or connected to the power device 10. The sensor connection 11 includes circuit elements for matching with various sensors as described above. The sensor connection unit 11 may further include an overvoltage protection element or an optical isolator, for example, a photocoupler, for preventing an overvoltage from being drawn into the apparatus shown in FIG. 2 from the outside. The signal output from the sensor connection unit 11 is a signal generated inside or outside the power equipment 10 in accordance with the operation of the power equipment 10.

3 is a diagram showing an example of an a signal output from the sensor connection unit 11 shown in Fig. 3, the signal detected by the sensor is divided into a commercial frequency component due to at least one of a vibration of the inside or the outside of the power device 10, a change in the magnetic field, and a change in the electric field, The a signal output from the sensor connection unit 11 is also caused by the frequency of the commercial frequency and noise due to at least one of the vibration of the power device 10 inside or outside, the change of the magnetic field, and the change of the electric field It can be seen that it contains one other frequency component. If the commercial frequency of the power source is 60 Hz, one period "T" of the a signal shown in Fig. 3 becomes 1/60 second. The a signal shown in FIG. 3 is only an example for helping understanding of the present embodiment, and can be a very complicated form in practice.

The first filter 12 passes a low frequency band below a commercial frequency and a remaining high frequency band from a signal output from the sensor connector 11, that is, a signal generated from the inside or the outside of the power device 10, The noise component in the high frequency band other than the commercial frequency component contained in the signal output from the signal processor 11 is removed. That is, the first filter 12 extracts the envelope of the commercial frequency from the signal output from the sensor connection unit 11. The first filter 12 may be implemented as a low pass filter (LPF) having a commercial frequency as a cutoff frequency.

The amplifying unit 13 amplifies the signal output from the first filter 12 with a constant amplification degree. Since the signal detected by the sensor as described above is generally a very weak signal, a very weak signal is also output from the first filter 12. When this weak signal is amplified by a general amplifier, a signal output from the first filter 12 can be severely deformed due to the noise generated in the amplifier, which is an active element. The amplifier 13 is preferably implemented as a low-noise amplifier for amplifying a weak signal output from the first filter 12. In addition, the amplification section 13 may be designed using a differential amplifier method in order to increase the discrimination power against noise.

The second filter 14 passes a low frequency band below the commercial frequency and cuts off the remaining high frequency band from the signal output from the amplifying unit 13 so that high frequencies other than the commercial frequency component included in the signal output from the amplifying unit 13 Thereby removing the noise component of the band. The second filter 14 serves to remove the noise generated in the amplifying unit 13 as described above. The second filter 14 may be implemented as a low-pass filter having a commercial frequency as a cut-off frequency as the first filter 12.

The variable amplification unit 15 amplifies the signal output from the second filter 14 to an amplification degree that varies according to the average size of the signal output from the signal operation unit 3. [ That is, the variable amplification unit 15 amplifies the signal output from the second filter 14 by the amplification degree calculated by the amplification control unit 16. Since the signal output from the sensor connection unit 11 is amplified by the amplification unit 13 with a constant degree of amplification, the magnitude of the signal output from the second filter 14 follows the magnitude of the signal output from the sensor connection unit 11 . The average size of the signal output from the sensor connection unit 11 is not constant due to various factors such as the type of the partial discharge, the degree of the partial discharge, the type of the sensor, Is not constant. The variable amplifying unit 15 amplifies the output signal from the second filter 14 so that the average size of the signal output from the second filter 14 becomes more constant regardless of the average size of the signal output from the sensor connection unit 11. [ And the magnitude of the signal is corrected according to the characteristics of the output signal of the sensor connection unit 11. [

The amplification control unit 16 controls the gain of the variable amplification unit 15 based on the average size of the signal output from the signal calculation unit 3, that is, the average size of the comparison synchronization signal fed back from the comparison signal generation unit 32. [ . More specifically, the amplification control unit 16 calculates the average size of the comparison synchronization signal output from the comparison signal generation unit 32 for a predetermined period of time, and controls the variable amplification unit 15 in inverse proportion to the average size of the comparison synchronization signal. . In this way, since the amplification degree of the variable amplification section 15 is calculated in inverse proportion to the average size of the comparison synchronization signal, if the average size of the comparison synchronization signal is large, the amplification degree of the variable amplification section 15 becomes small, When the size is small, the amplification degree of the variable amplification part 15 becomes large. Therefore, the average size of the signal output from the second filter 14 becomes more constant irrespective of the average size of the signal output from the sensor connection unit 11.

4 is a diagram showing an example of the b signal output from the variable amplification unit 15 shown in Fig. Referring to FIG. 4, the b signal output from the variable amplification unit 15 is a frequency component corresponding to a commercial frequency of a power source from the a signal shown in FIG. 3, that is, It can be seen that the noise component in the other high frequency band is removed and the signal is amplified five times.

Referring again to FIG. 2, the signal generating unit 2 generates a signal having characteristics that are more synchronously changed to the commercial frequency of the power source by correcting the wave of the signal detected by the signal detecting unit 1. The signal generating section 2 is composed of an integrating section 21, a synchronizing signal comparing section 22 and a wave modifying section 23. [ The integrating unit 21 corrects the distortion of the wave of the signal output from the signal detecting unit 1 by integrating the signal output from the signal detecting unit 1 according to the degree of distortion of the signal outputted from the signal calculating unit 3. [ The synchronizing signal comparator 22 compares the signal output from the integrator 21 with the signal fed back from the signal processor 3 to generate a signal having characteristics that are more synchronized with the commercial frequency of the power supply. The signal fed back from the signal operation unit 3, that is, the reference comparison signal may be a single-phase signal or a three-phase signal depending on whether the power source is a single-phase or three-phase. When the reference comparison signal is a three-phase signal, the synchronizing signal comparator 22 generates three signals having characteristics that are more synchronously changed in phase with respect to the three frequencies of the three signals constituting the three-phase signal.

5 is a diagram showing an example of a c signal output from the integrator 21 shown in Fig. The wave of the b signal outputted from the signal detecting section 1 can be distorted by the noise as shown in Fig. This wave distortion is represented by the distortion and the phase offset of a portion of the signal that is independent of the commercial frequency of the power supply. Referring to FIG. 5, when the b signal output from the signal detector 1 is integrated by the integrator 21, the distortion of a part of the signal irrespective of the commercial frequency of the power source can be eliminated. Particularly, the phase of the peak portion of the b signal is delayed by the integration of the integrating portion 21, and the larger the value of the time constant used for this integration is, the more the delay is. Thus, the phase offset described above can be corrected by adjustment of the integral time constant.

The wave correction section 23 corrects the waveform of the signal outputted from the signal detection section 1 based on the degree of distortion of the signal output from the signal calculation section 3, Calculate the number. Then, the integrating section 21 integrates the signal output from the signal detecting section 1 using the time constant calculated by the wave correcting section 23, thereby correcting the distortion of the wave of the signal output from the signal detecting section 1 do. More specifically, the wave correction section 23 calculates the time constant to be used for integrating the signal output from the signal detection section 1 in proportion to the distortion degree of the signal calculated by the correction control section 33. As the degree of distortion of the signal output from the signal operation unit 3 increases, the size of the time constant increases accordingly. As a result, the phase of the peak portion of the signal is further delayed and the phase of the signal output from the signal detection unit 1 The offset is corrected.

6 is a detailed configuration diagram of the synchronization signal comparison unit 22 shown in FIG. Referring to FIG. 6, the synchronizing signal comparator 22 includes a comparator 221, a comparison offset controller 222, and a zero offset controller 223. The comparator 221 compares the signal output from the integrator 21 with the signal output from the comparison offset controller 222 and outputs the signal output from the integrating unit 21 rather than the signal output from the comparison offset controller 222 A square wave having a large section as a high section and a remaining section as a low section is generated. Then, the comparator 221 compares the square wave thus generated with the signal output from the zero offset control unit 223, sets the section having a larger square wave signal as a high section than the signal output from the zero offset control unit 223, And generates a square wave having the section as the low section.

The comparison offset controller 222 generates a comparison offset signal having a high section of the feedback signal as a low section and a low section of the feedback signal as a high section from a signal fed back from the signal computing section 3, . The magnitude of the high period of the comparison offset signal is set to be larger than the maximum value of the peaks of the signal output from the integrator 21. [ Accordingly, the section corresponding to the low section of the signal fed back from the signal operation section 3 in the section of the signal output from the integrator section 21 is processed as low. That is, the section corresponding to the low section of the signal fed back from the signal operation section 3 is removed from the signal output from the integrator section 21. Thus, the offset between the signal output from the integrator 21 and the signal fed back from the signal calculator 3 is corrected.

The zero offset control unit 223 generates a comparison offset signal having a high section of the feedback signal as a low section and a low section of the feedback signal as a high section from a signal fed back from the signal computing section 3, . The magnitude of the high period of the comparison offset signal is set to be larger than the maximum value of the peaks of the signal output from the integrator 21. [ In this way, the zero offset control unit 223 performs the same operation as the comparison offset control unit 222, and the offset between the signal output from the integrator 21 and the signal fed back from the signal operation unit 3 is more reliably zero zero. As described above, the comparator 221 can generate a square wave more completely synchronized with the commercial frequency of the signal fed back from the signal operating unit 3. [

7 is a diagram showing an example of the d signal output from the synchronizing signal comparator 22 shown in FIG. The d signal shown in FIG. 7 and the c signal shown in FIG. 5 are compared with the signal c shown in FIG. 7 from the signal c shown in FIG. 5 corresponding to the low section of the signal fed back from the signal processor 3 It can be seen that the section is a removed signal. As described below, when the cycle of the d signal shown in FIG. 7 and the cycle of the commercial frequency of the power source are continuously equal to or more than the reference, they are output as the synchronization signal for detecting the partial discharge of the power device 10. 7 is a signal synchronized with the commercial frequency of the power source actually flowing in the power device 10, unlike the frequency of the commercial power source supplied by the power company, so that the power device 10 It is possible to detect the partial discharge more accurately.

Referring again to FIG. 2, the signal calculating unit 3 calculates the signal generating unit 2 according to the degree of consecutive matching between the period calculated by the operation of the signal generated by the signal generating unit 2 and the period of the commercial frequency of the power source ) As a synchronous signal for partial discharge detection of the power device 10. [ More specifically, when the period calculated by the operation of the signal generated by the signal generator 2 and the cycle of the commercial frequency of the power source are continuously equal to or greater than the reference, the signal generator 3 ) As a synchronous signal for partial discharge detection of the power device 10. [ If the degree of consecutive agreement between the period calculated by the calculation of the signal generated by the signal generating section 2 and the cycle of the commercial frequency of the power source is less than the reference value, the signal generated by the signal generating section 2 is not outputted And it is processed as a fail indicating a state in which the synchronization signal for partial discharge detection can not be generated. In the case where the signal of the commercial frequency component caused by the vibration of the power device 10 due to noise, the change of the magnetic field, and the change of the electric field is severely distorted or the power device 10 does not operate normally, .

The signal calculating section 3 is composed of a synchronous signal generating section 2, a correction controlling section 33, and a comparison signal generating section 32. [ The synchronous signal generating section 2 calculates the period of the signal generated by the signal generating section 2 by calculating the signal generated by the signal generating section 2. [ For example, the synchronization signal generating section 2 calculates the period of the signal generated by the signal generating section 2 by calculating the signal generated by the signal generating section 2 using an autocorrelation function Can be calculated. When the difference between the cycle of the output signal of the signal generator 2 and the cycle of the commercial frequency of the power source obtained through the above calculation is within the reference range for a predetermined time, the synchronizing signal generator 2 generates a signal 2 as a synchronous signal for detecting the partial discharge of the electric power machine 10. Here, the value of the commercial frequency period, which is compared with the period of the signal obtained through the calculation, may be 60 Hz as a fixed value.

When the difference between the period of the output signal of the signal generator 2 and the period of the commercial frequency of the power source is within the reference range for a certain period of time, the period of the signal generated by the signal generator 2, Are consecutively matched. Here, the predetermined time and the reference range should be set to the maximum time and maximum range at which the noise can be distinguished from the signal synchronized with the commercial frequency of the current flowing through the power device 10. [ That is, if the predetermined time and the reference range are too small, the signal may be processed as a fail signal even if the signal is synchronized with the commercial frequency of the current flowing in the power device 10, It can be outputted as a synchronous signal for partial discharge detection. For example, the predetermined time may be set to 1 ms, and in the case where the commercial frequency is 60 Hz, the reference range may be set to 55 to 65 Hz.

The comparison signal generating section 32 corrects the phase of the frequency of the signal output from the synchronizing signal generating section 2 based on the phase of the reference signal so that the phase of the frequency of the signal output from the synchronizing signal generating section 2 is fixed Thereby generating a reference comparison signal. As described above, this reference comparison signal is used to correct the phase fluctuation of the synchronizing signal due to noise or the like. More specifically, the comparison signal generating unit 32 generates a comparison signal having a phase of a frequency of a signal output from the synchronizing signal generating unit 2 based on the phase of a reference signal using a phase locked loop (PLL) .

8 is a detailed configuration diagram of the comparison signal generator 32 shown in FIG. Referring to FIG. 8, the comparison signal generator 32 includes a reference signal generator 321, a first loop filter 322, a second loop filter 323, a first divider 324, a second divider 325 A phase detector 326, a mixer 327, and a voltage controlled oscillator (VCO) 328. The configuration of the comparison signal generating unit 32 shown in Fig. 8 may be another type of phase locked loop circuit as an example of a general phase locked loop circuit. For example, the first divider 324 and the second divider 325 of the components shown in FIG. 8 may be omitted.

The reference signal generator 321 generates a reference signal. For example, when the commercial frequency of the power source is 60 Hz, the reference signal generator 321 can generate a square wave having a frequency of 60 Hz as a reference signal. In particular, the reference signal generator 321 generates a reference signal in accordance with the phase of the synchronization signal of the other apparatus received through the communication unit 4, thereby generating a plurality of synchronous signals Signals can be synchronized. Meanwhile, when a plurality of synchronization signals are received from a plurality of other devices through the communication unit 4, the reference signal generation unit 321 generates a reference signal according to an average of phases of a plurality of synchronization signals.

The first loop filter 322 passes the low frequency band of the reference signal generated by the reference signal generator 321 and blocks the high frequency band to remove noise in the high frequency band included in the reference signal. The second loop filter 323 passes the low frequency band of the error signal generated by the phase detector 326 and blocks the high frequency band, thereby eliminating the high frequency band noise included in the error signal. The first divider 324 divides the frequency of the signal output from the first loop filter 322 by an N value. The second divider 325 divides the frequency of the signal output from the VCO 328 by M values.

The phase detector 326 detects the phase difference between the signal divided by the first divider 324 and the signal divided by the second divider 325 to generate an error signal corresponding to the phase difference. Accordingly, the comparison signal generator 32 outputs a signal having a frequency corresponding to the result of multiplying the frequency of the reference signal by N / M. The mixer 327 mixes the synchronization signal output from the synchronization signal generator 2 and the error signal output from the second loop filter 323. The VCO 328 generates an oscillation signal having a frequency corresponding to the voltage of the signal output from the mixer 327, and outputs the oscillation signal thus generated as a comparison synchronization signal. When the phase of the oscillation signal output from the VCO 328 is shifted, the error signal is increased and the VCO 328 is controlled so that the phase is shifted in the opposite direction to reduce such error. Thus, an output signal insensitive to phase fluctuation due to noise can be obtained.

The correction control section 33 calculates the distortion degree of the signal generated by the signal generation section 2 based on the calculation result of the synchronization signal generation section 2. [ The greater the difference between the period of the output signal of the signal generator 2 obtained by the operation of the synchronous signal generator 2 and the period of the commercial frequency of the power source, the greater the degree of distortion of the signal generated by the signal generator 2 .

Fig. 9 is a configuration diagram of the power supply unit 5 shown in Fig. Referring to FIG. 9, the power supply unit 5 generates power using electrical energy converted by at least one sensor as described above, and supplies the generated power to a signal To the detecting unit 1, the signal generating unit 2, the signal calculating unit 3, and the communication unit 4. That is, the power supply unit 5 generates a power supply from the electric energy of the signal output from the sensor connection unit 11 by using an energy harvesting technique, and supplies the generated power supply to the configuration of the apparatus shown in FIG. 2 Lt; / RTI > The power line representing the flow of power supplied from the power supply unit 5 is omitted in order to prevent the drawing from being complicated.

As described above, the power source necessary for driving the apparatus shown in FIG. 2 uses the energy harvesting technique to change the vibrations, the magnetic field, the electric field, and the electric current of the power device 10, The apparatus shown in Fig. 2 can be easily applied to a mountainous area where a separate commercial power supply is difficult. Thus, the device shown in FIG. 2 has excellent field applicability.

The power source unit 5 includes an autonomous power source unit 51, a commercial power source unit 52, and a battery 53. The autonomous power supply unit 51 generates electric power using the electric energy converted by the at least one sensor, and supplies the thus generated electric power to the components of the apparatus shown in Fig. The commercial power supply unit 52 is a power supply unit that is configured such that the amount of power consumed in the signal detection unit 1, the signal generation unit 2, and the signal calculation unit 3, which are components of the apparatus shown in FIG. 2, Power is generated using the commercial power supplied from the power company, and the thus-generated power is supplied to the components of the apparatus shown in Fig. Power can be supplied to the apparatus shown in FIG. 2 more stably through such power duplication.

The power supply unit 5 charges the remaining battery power supplied to the components of the apparatus shown in Fig. 2 to the battery 53. When the power supply unit 5 can not generate the power supply, To the components of the apparatus shown in Fig. More specifically, at least one of the autonomous power supply unit 51 and the commercial power supply unit 52 of the power supply unit 5 is supplied to the components of the apparatus shown in FIG. 2, and the surplus power supply is charged to the battery 53 The autonomous power source unit 51 and the commercial power source unit 52, the power charged in the battery 53 is supplied to the components of the apparatus shown in FIG. To this end, the power supply unit 5 may include a circuit for charging the battery 53. [ As described above, the power source unit 5 includes the battery 53 that is charged with the spare power source in case of emergency that can not be generated by the power source unit 5, so that power can be supplied to the apparatus shown in FIG. 2 even in an emergency, Further, it is possible to detect the partial discharge even in the non-power source environment where the commercial power is cut off.

The power supply unit 5, that is, the autonomous power supply unit 51 generates power using electric energy converted from solar energy by a solar cell (not shown), and supplies the generated power to the device To the components of the system. Those skilled in the art will appreciate that the power source 5 can generate power using other alternative energy sources such as geothermal, wind, tidal, and wave power in addition to sunlight.

Fig. 10 is a configuration diagram of the communication unit 4 shown in Fig. 10, the communication unit 4 transmits the partial discharge detection synchronizing signal output from the signal operation unit 3 to at least one other apparatus, and receives the partial discharge detection synchronizing signal from at least one other apparatus . The communication unit 4 includes a wireless communication unit 41 and a wired communication unit 42. The wireless communication unit 41 transmits the synchronization signal for partial discharge detection outputted from the signal calculation unit 3 to the at least one other device connected to the network of the plurality of devices for generating the synchronization signal for partial discharge detection via the wireless network , And receives a partial discharge detection synchronization signal from at least one other apparatus. The wired communication unit 42 transmits the synchronization signal for detecting the partial discharge, which is output from the signal calculation unit 3 via the wired network, to at least one other device connected to the network of the plurality of devices for generating the synchronization signal for partial discharge detection , And receives a partial discharge detection synchronization signal from at least one other apparatus.

FIG. 11 is a diagram showing a network environment in which devices and other devices shown in FIG. 2 are assembled and assembled. Referring to FIG. 11, the apparatus shown in FIG. 2 and a network of other apparatuses for generating a synchronization signal for detecting a partial discharge include N apparatuses corresponding to a local apparatus and N apparatuses corresponding to a master apparatus Devices are interconnected. Here, the local device is a device for generating a partial discharge detection synchronizing signal in accordance with the phase of a synchronizing signal of another device. The master device is a device for providing a synchronizing signal serving as a reference of a partial discharge detecting synchronizing signal. The number of master devices may be generally one or more. When there are a plurality of master devices, a synchronization signal for detecting the partial discharge is generated in accordance with the average of the phases of the synchronization signals received from the master devices.

As described above, since the comparison signal generator 32 generates the reference signal in accordance with the phase of the synchronization signal of the other device received through the communication unit 4, the comparison signal generator 32 generates the synchronization signal for partial discharge detection A signal can be generated. Thereby, the phase difference of the synchronization signals generated by the various devices can be corrected. As a result, since the synchronization signals of the various devices for generating the partial discharge detection synchronizing signal are synchronized with each other, a signal which is not actually synchronized to the commercial frequency by a certain device can be prevented from being generated as the synchronization signal for detecting the partial discharge.

12 is a flowchart of a method of generating a synchronization signal for detecting a partial discharge according to an embodiment of the present invention. Referring to FIG. 12, the synchronizing signal generating method according to the present embodiment is comprised of steps that are performed in a time-series manner in the apparatus shown in FIG. Therefore, even if omitted below, the contents described above with respect to the apparatus shown in FIG. 2 also apply to a method of generating a synchronous signal, which will be described below.

In operation 121, the signal detector 1 detects a frequency component corresponding to a commercial frequency of a power supplied to the power device 10 from a signal generated in the power device 10 or in accordance with an operation of the power device 10 Signal. In step 122, the signal generator 2 corrects the wave of the signal detected in step 121, thereby generating a signal having characteristics that are more synchronized with the commercial frequency of the power source. In step 123, the signal operation unit 3 outputs the signal generated in step 122 to the part of the power device 10 according to the degree of consecutive matching between the period calculated by the operation of the signal generated in step 122 and the period of the commercial frequency of the power source And outputs it as a discharge detection sync signal. The detailed operation of each step will be replaced with the contents already described in detail regarding the operation of the signal detecting unit 1, the signal generating unit 2, and the signal calculating unit 3. [

As described above, since the partial discharge detection synchronizing signal according to the above-described embodiments is a signal synchronized with the commercial frequency of the power source actually flowing in the power device 10, the part generated by the power device 10 The discharge can be detected more accurately. Further, the power source necessary for driving the apparatus for generating the partial discharge detection synchronizing signal uses the energy harvesting technique to change the vibrations, the magnetic field, the electric field, Energy, the above-described embodiments can be easily applied to a mountainous area where a separate commercial power supply is difficult.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1 ... signal detector
2 ... signal generator
3 ... signal operation section
4 ... communication unit
5 ... power supply unit
11 ... sensor connection
12 .... first filter
13:
14 ... second filter
15 ... variable amplifier section
16:
21 ... integral part
22 ... synchronizing signal comparator
23 ... wave correction unit
31 ... synchronous signal generator
32 ... comparison signal generator
33 ... correction control section
51 ... autonomous power section
52 ... commercial power supply
53 ... battery

Claims (15)

An apparatus for generating a partial discharge detection synchronizing signal,
A signal detector for detecting a signal of a frequency component corresponding to a commercial frequency of a power supplied to the power device from a signal generated in the power device according to an operation of the power device;
A signal generating unit for generating a signal having characteristics that are more synchronously changed with respect to the commercial frequency by correcting the wave of the signal detected by the signal detecting unit; And
A signal generated by the signal generator according to a degree of consecutive coincidence between a period calculated by the operation of the signal generated by the signal generator and a period of the commercial frequency is used as a partial discharge detection synchronizing signal of the power device And a signal calculation section for outputting the signal. The method according to claim 1,
Wherein the signal generated from the inside or the outside of the power device includes a commutated frequency component due to at least one of a change in an internal or external vibration of the power device, a change in a magnetic field, and a change in an electric field. The method according to claim 1,
Further comprising a sensor connection portion for receiving signals generated from the inside or the outside of the power device from at least one sensor attached to or connected to the power device,
Wherein the at least one sensor comprises a sensor for converting the vibration of the power device itself into electrical energy, a sensor for converting a magnetic field change in the power device into electrical energy, And a coupling capacitor for converting a change in an electric field caused by a current flowing in the transmission line of the power device into electric energy. The method of claim 3,
Further comprising a power supply for generating power by using the electrical energy converted by the at least one sensor and for supplying the generated power to the components of the apparatus for generating the synchronization signal for partial discharge detection. 5. The method of claim 4,
The power supply unit
An autonomous power supply unit for generating power by using the electrical energy converted by the at least one sensor and supplying the generated power to the components of the apparatus for generating the partial discharge detecting synchronization signal; And
When the amount of electric power consumed by the components of the apparatus for generating the partial discharge detection synchronizing signal exceeds the amount of electric power generated by the autonomous power source unit, the electric power is generated by using the commercial power supplied from the electric power company, And a commercial power source for supplying the generated power to the components of the apparatus for generating the partial discharge detection synchronizing signal. The method of claim 3,
The power supply unit charges the remaining power supplied to the components of the apparatus for generating the partial discharge detection synchronizing signal and supplies remaining power to the battery. When the power generation by the power supply unit is not possible, To the components of the apparatus that generate the signal. The method according to claim 1,
Further comprising a power supply unit for generating power by using electric energy converted from solar energy by the solar cell and supplying the generated power to the components of the apparatus for generating the synchronization signal for detecting the partial discharge. The method according to claim 1,
Wherein the signal detector detects a frequency component corresponding to the commercial frequency by extracting and amplifying a frequency component corresponding to the commercial frequency from a signal generated inside or outside the power device. 9. The method of claim 8,
The signal detector
A first filter for passing a low frequency band below the commercial frequency and blocking the remaining high frequency bands from a signal generated inside or outside the power device;
An amplifying unit amplifying a signal output from the first filter with a predetermined amplification degree;
A second filter for passing a low frequency band below the commercial frequency and blocking the remaining high frequency bands from the signal amplified by the amplifier; And
And a variable amplification unit amplifying the signal output from the second filter with an amplification degree that varies according to an average size of a signal output from the signal operation unit. The method according to claim 1,
The signal generator
An integrator for correcting a distortion of a wave of a signal output from the signal detector by integrating a signal output from the signal detector according to a degree of distortion of the signal output from the signal calculator; And
And a synchronizing signal comparator for comparing the signal output from the integrating unit and the signal fed back from the signal computing unit to generate a signal having a characteristic of being regularly synchronized with the commercial frequency. 11. The method of claim 10,
Wherein the signal generating unit further includes a wave correcting unit for calculating a time constant used for integrating a signal output from the signal detecting unit in accordance with a distortion degree of a signal output from the signal calculating unit,
And the integrating unit corrects the distortion of the wave of the signal output from the signal detecting unit by integrating the signal output from the signal detecting unit using the time constant calculated by the wave correcting unit. The method according to claim 1,
The signal operation unit
A signal generation unit for generating a signal generated by the signal generation unit; and a control unit for calculating a period of the signal generated by the signal generation unit when the difference between the calculated period and the period of the commercial frequency is within a reference range, A synchronous signal generator for outputting a signal generated by the synchronous signal generator as a synchronous signal for partial discharge detection of the power device; And
And a comparison signal generating unit for generating a reference comparison signal in which the phase of the frequency of the signal output from the synchronization signal generating unit is fixed by correcting the phase of the frequency of the signal output from the synchronization signal generating unit based on the phase of the reference signal . 13. The method of claim 12,
And a communication unit for transmitting the partial discharge detection synchronizing signal output from the signal operation unit to at least one other apparatus and for receiving the partial discharge detection synchronizing signal from the at least one other apparatus,
Wherein the comparison signal generator generates a reference signal in accordance with the phase of the synchronization signal for partial discharge detection received through the communication unit. 13. The method of claim 12,
Wherein the signal operation unit further comprises a correction control unit for calculating a degree of distortion of the signal generated by the signal generation unit based on a result of the operation of the synchronization signal generation unit. A method for generating a partial discharge detection synchronizing signal,
Detecting a signal of a frequency component corresponding to a commercial frequency of a power source supplied to the power device from a signal generated inside or outside the power device according to operation of the power device;
Generating a signal having characteristics that are more synchronously and variably shifted to the commercial frequency by correcting the wave of the detected signal; And
And outputting the generated signal as a synchronization signal for partial discharge detection of the power device according to a degree of consecutive matching between the period calculated by the calculation of the generated signal and the period of the commercial frequency.

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