KR20120124569A - A Measuring Device For A Partial Discharge Signal Of A High Voltage Rotating Machinery And A Method Thereof - Google Patents

Abstract

PURPOSE: A device for measuring the partial discharge of a high voltage rotor and a measuring method thereof is provided to accurately check an abnormal state of stator windings by accurately dividing the polarity of a partial discharge signal generated in a high voltage rotor. CONSTITUTION: A receiving unit receives an original partial discharge signal generated from a high voltage rotor(S110). A channel unit measures the received partial discharge signal and inverts the partial discharge signal to measure the same(S120). A peak value extracting unit extracts a first peak value and a second peak value from the signal measured by the channel unit(S130). A signal polarity determining unit determines the polarity of the partial discharge signal by using the first and the second peak values(S140). [Reference numerals] (AA) Start; (BB) Extracting the first peak value; (CC) Extracting the second peak value; (DD) Comparator; (EE) Setting the polarity of a partial discharge signal; (FF) Outputting; (GG) Finish; (S110) Original partial discharge signal receiving unit; (S121) Measuring a partial discharge signal; (S122) Measuring an inverted partial discharge signal

Description

A measuring device for a partial discharge signal of a high voltage rotating machinery and a method thereof}

The present invention is a partial discharge measuring device for diagnosing the insulation state of a high-voltage rotating device, and more particularly, the peak value of each signal is extracted by measuring the received partial discharge signal as it is and inverting the received partial discharge signal. In comparison, the present invention relates to an apparatus for enabling polarity discrimination of partial discharge signals.

As industrial production facilities are expanded and automated, rotating machinery is becoming larger and reliability of operation becomes a prerequisite, and sudden stoppages caused by deterioration due to long-term operation of the rotating machinery cause huge disruption to production. In order to prevent such a sudden stop, such as measures to improve the performance of the rotating machine, preventive diagnosis and economic maintenance methods are required. The preventive diagnosis of the rotary device is divided into a mechanical diagnosis and an electrical diagnosis. The mechanical diagnosis is a technology for diagnosing an abnormal state by measuring noise and vibration, and the electrical diagnosis is a diagnosis technology for an insulation state of the stator winding of the rotating device. The electrical diagnosis is divided into a method performed during the stop of the rotating device and a method performed during the operation. Diagnosis method during the stop has to stop the rotating device, especially in the case of high-voltage rotary device has the disadvantage that can not detect the abnormal state occurring in the actual operating state as well as the economic loss due to the operation stop of the device. In order to compensate for these disadvantages, a method of diagnosing the insulation state of the stator windings by measuring the partial discharge signal generated during the actual operation of the high voltage rotating device is widely used.

Among the methods of diagnosing the insulation state of the stator windings by measuring the partial discharge signal of a high voltage rotating machine, a diagnostic method according to the polarity of the partial discharge signal is typically used. Specifically, in case of break between wire insulation, break between turns insulation, and breakdown between strand and winding conductor and main insulation interface, the magnitude of negative partial discharge is large, and the semi-conductive layer insulation of main insulation surface In case of breakage and discharge in the stator slot or surface discharge of the endwinding portion, positive partial discharge is large, so that a diagnostic method according to the polarity of the partial discharge signal is useful.

The method of distinguishing the polarity of the current partial discharge signal is that a signal measured between 0 and 180 degrees is a negative partial discharge signal, and 180 to 360 degrees based on the fact that most partial discharge signals have the same polarity in a specific phase. The signal measured in between is divided into a positive partial discharge signal. However, the phase may have a different reference according to the person analyzing the partial discharge signal.

According to the conventional method of distinguishing the polarity of the partial discharge signal, as shown in FIG. 3A, the first peak value 30, which is the largest value of the partial discharge signal, cannot be extracted, and the second peak value is extracted to polarity. There is a disadvantage of not accurately grasping. This is a problem caused by discriminating polarity through phases without considering the actual polarity of the partial discharge signal. The accuracy of analysis of the polarity of the partial discharge signal is inaccurate, especially when the phase synchronization is not accurate or the size of the adjacent phase. It can be seen that there is a problem in that the reliability of polarity determination is low when a large partial discharge signal is induced and measured or there is noise.

The present invention is to provide a partial discharge measuring device and a method for measuring the insulation of the high-voltage rotary device to accurately diagnose the insulation state as described above, while measuring the received partial discharge signal as it is while receiving the received partial discharge signal Extract the peak value of each signal by inverting it? By comparing the polarity of the partial discharge signal by comparing the polarity of the partial discharge signal, to improve the accuracy of the analysis of the polarity of the partial discharge signal, and to provide a partial discharge measurement device and method of the high-voltage rotary equipment that can be used to remove the noise to increase the reliability. There is this.

The partial discharge measuring device of the high voltage rotary machine as described above,

A signal receiver for receiving a partial discharge signal generated from the high voltage rotating device;

A channel unit for measuring the received partial discharge signal as it is and inverting the received partial discharge signal;

A peak value extraction unit for obtaining a first peak value extracted from the signal measured as it is in the channel unit and a second peak value extracted from the inverted signal;

A signal polarity determining unit for determining the polarity of the partial discharge signal according to the peak value extracting unit;

Characterized in that it comprises a.

In particular, the channel unit may include a first channel unit for measuring the received partial discharge signal as it is and a second channel unit for inverting and measuring the received partial discharge signal.

In addition, the first peak value and the second peak value in the peak value extracting section are first extracted from two positive partial discharge signals obtained by passing diodes for each of the two signals measured in the channel section. Characterized in that the peak value is determined.

In addition, the signal polarity determining unit recognizes the positive partial discharge signal when the first peak value is larger than the second peak value when the first peak value and the second peak value are compared. If the value is larger than the first peak value, it is recognized as a negative partial discharge signal.

On the other hand, a partial discharge measurement method of a high voltage rotating device, which is another aspect of the present invention,

(a) receiving a partial discharge signal generated from a high voltage rotating machine;

(b) measuring the received partial discharge signal as it is while inverting the received partial discharge signal;

(c) extracting a first peak value from the measured signal as it is and extracting a second peak value from the inverted measured signal;

(d) determining the polarity of the partial discharge signal according to the extracted first peak value and the second peak value;

Characterized in that it comprises a.

Particularly, the received partial discharge signal is measured as it is in the first channel unit, and the measured partial discharge signal is inverted in the second channel unit.

In addition, the extracted first peak value and the extracted second peak value are first extracted from two positive partial discharge signals obtained by passing diodes for each of the two signals measured in the channel unit. Characterized in that determined.

The polarity determination of the partial discharge signal may be regarded as a positive partial discharge signal when the first peak value is larger than the second peak value when the first peak value and the second peak value are compared. If the second peak value is larger than the first peak value, it is recognized as a negative partial discharge signal.

When the partial discharge signal is measured by using the partial discharge measurement apparatus of the high voltage rotating apparatus of the present invention as described above,

First, it is possible to improve the accuracy of the analysis of the abnormal state of the stator winding through the accurate polarization of the partial discharge signal generated in the high-voltage rotating equipment,

Second, the partial discharge signal is generally generated in the rising section of the sine wave, and most of the partial discharge signals show the same polarity in each rising section. It is possible to increase the reliability of the partial discharge analysis by leaving the partial discharge signal of the polarity occupying and leaving the other polarity signal noise processed.

Third, it is easy to interwork with the polarity determination technique of the existing partial discharge signal, and there is an advantage that does not require a separate expensive equipment, commercial? Economic effects are expected.

1 is a flowchart illustrating a partial discharge measuring apparatus and a measuring method thereof of a high voltage rotating apparatus including a first channel unit and a second channel unit according to an embodiment of the present invention;
Figure 2a is a graph showing the measurement of the partial discharge signal received in the first channel portion of Figure 1 according to an embodiment of the present invention,
FIG. 2B is a graph illustrating an inverted measurement of the partial discharge signal received at the second channel unit of FIG. 1 according to one embodiment of the present invention; FIG.
3A and 3B are signal graphs after wave shaping with respect to an original partial discharge signal.

DETAILED DESCRIPTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which the configuration and operation of the present invention shown in the drawings and described by the present invention will be described as one embodiment, whereby the present invention is described above. The technical idea and its core composition and operation are not limited.

In addition, the terminology used in the present invention is to select a general term widely used as possible at present, but in certain cases using a term arbitrarily selected by the applicant, in this case, the meaning is clearly described in the detailed description of the part. However, the terms used in the description of the present invention should not be simply interpreted, but should be interpreted by grasping the meaning of the corresponding terms.

The configuration of the measuring device for distinguishing the polarity of the partial discharge signal generated in the high voltage rotary machine according to the present invention is as follows. Iii) a signal receiver for receiving a partial discharge signal generated from a high voltage rotating machine, ii) a channel portion for measuring the received partial discharge signal as it is while inverting the received partial discharge signal, and iii) the channel. A peak value extracting unit for obtaining a first peak value extracted from the signal measured as it is, and a second peak value extracted from the inverted signal, i) a partial discharge signal according to the result of the peak value extracting unit; And a signal polarity determining portion for determining the polarity.

Hereinafter, the present invention will be described in more detail with reference to FIG. 1.

The i) signal receiving unit s110 receives an original partial discharge signal generated from a high voltage rotating device. In particular, the signal receiver may simultaneously receive the partial discharge signal of the three-phase power source, and the measurer may select and receive only the partial discharge signal of any particular phase of the three-phase power source. At the same time, this means that two or more original partial discharge signals may be received at a time interval selected by the measurer.

Thereafter, the received partial discharge signals are measured as ii) the received partial discharge signal in the channel unit s120 as it is, and the received partial discharge signal is inverted. The channel unit may include a first channel unit s121 for measuring the received partial discharge signal as it is and a second channel unit s122 for inverting and measuring the received partial discharge signal. Of course, it is also possible to invert the signal in the first channel unit and measure the signal as it is in the second channel unit. As an example, an original partial discharge signal generated in one of three phase power sources is received and measured as shown in FIG. 2A in the first channel unit, and as shown in FIG. 2B in the second channel unit. It can be measured by inverting it as well.

Next, the peak value extracting unit s130 extracts the first peak value and the second peak value from the signal measured by the channel unit. As an example, as shown in FIG. 1, a first peak value may be extracted from the signal measured by the first channel unit, and a second peak value may be extracted from the signal measured by the second channel unit. In particular, since the partial discharge signal is generated through charging / discharging, it is characterized by an oscillation and disappearing after the signal is generated. Most of the partial discharge signals after the process are the first among the peak values extracted. Has a peak value generated by the maximum value. For this reason, the first peak value extracted from the positive partial discharge signal obtained by passing a diode with respect to the signal measured in the first channel portion is the first peak value, and the diode with respect to the signal measured in the second channel portion. The first peak value extracted from the positive partial discharge signal obtained by passing through may be determined as the second peak value, respectively.

As an example, as shown in FIGS. 2A and 2B, x2 is the first peak value in the left signal of FIG. 2A measured by the first channel unit, and x3 is the first peak value in the right signal of FIG. 2A. Extracted to peak value. And it can be seen that x1- is the second peak value in the left signal of FIG. 2b measured by the second channel unit, and x4- is the second peak value in the right signal of FIG. 2b. That is, based on the present embodiment, in extracting the first peak value and the second peak value, the first (x1, x3) and the second (x2) of the original partial discharge signal shown in FIG. 2A are extracted. , x4) peak value.

Finally, the signal polarity determining unit s140 determines the polarity of the partial discharge signal using the first peak value and the second peak value extracted from the peak value extracting unit s130. The signal polarity determining unit s140 recognizes the positive partial discharge signal when the first peak value is larger than the second peak value when comparing the first peak value with the second peak value. If the second peak value is larger than the first peak value, the peak value is recognized as the negative partial discharge signal and the determined polarity is output. The above-described signal polarity crystal configuration is applied even if the configuration of measuring the original partial discharge signal and the original partial discharge signal inverted as it is or the configuration of extracting the first peak value and the second peak value are different. This is possible.

By using such a partial discharge measuring device, it is possible to accurately distinguish the polarity of the partial discharge signal generated in the high-voltage rotating device, and it is possible to interwork with the existing measuring device while improving the reliability of the analysis.

In addition, the configuration of the measuring method for distinguishing the polarity of the partial discharge signal generated in the high voltage rotary device according to the present invention is as follows: i) receiving the partial discharge signal generated from the high voltage rotary device, ii) the received Measuring the partial discharge signal as it is while inverting the received partial discharge signal, i) extracting a first peak value from the measured signal as it is, and extracting a second peak value from the measured signal by inverting it And iii) determining the polarity of the partial discharge signal according to the extracted first peak value and the second peak value.

Hereinafter, the present invention will be described in more detail with reference to FIG. 1.

In the step iii), an original partial discharge signal generated from the high voltage rotating device is received (s110). In particular, at the time of reception, the partial discharge signal of the three-phase power source can be simultaneously received, and it is also possible for the measurer to select and receive only the partial discharge signal of any particular phase of the three-phase power source. At the same time, this means that two or more original partial discharge signals may be received at a time interval selected by the measurer.

Thereafter, the received partial discharge signals are measured as they are in step ii) while the received partial discharge signals are inverted (S120). The received partial discharge signal may be measured in the first channel unit s121 as it is, and the received partial discharge signal may be inverted and measured in the second channel unit s122. Of course, it is also possible to invert the signal in the first channel unit and measure the signal as it is in the second channel unit. As an example, an original partial discharge signal generated in one of three phase power sources is received and measured as shown in FIG. 2A in the first channel unit, and as shown in FIG. 2B in the second channel unit. It can be measured by inverting it as well.

In operation iii), the first peak value is extracted from the measured signal as it is, and the second peak value is extracted from the measured signal by inversion (s130). As an example, as shown in FIG. 1, a first peak value may be extracted from the signal measured by the first channel unit, and a second peak value may be extracted from the signal measured by the second channel unit. To extract the peak value, a peak-hold method, which is one of partial discharge signal measurement methods, may be used. Specifically, the method performs wave shaping using only signals having a positive value after passing through the diode by using the signals measured in the first channel portion and the second channel portion as inputs. In order to measure the partial discharge signal, the peak values of the signal after the waveform shaping are held and analyzed through analog / digital conversion. Here, the present invention can extract the first peak value from the signal measured in the first channel portion and the second peak value from the signal measured in the second channel portion from the signal after the waveform shaping shown in FIG. 3B. have.

In particular, since the partial discharge signal is generated through charging / discharging, it is characterized in that it oscillates and disappears after the signal is generated. Most of the partial discharge signals after the waveform shaping are the first peaks among the held peak values. Has the maximum value. For this reason, the first peak value extracted from the positive partial discharge signal obtained by passing a diode with respect to the signal measured in the first channel portion is the first peak value, and the diode with respect to the signal measured in the second channel portion. The first peak value extracted from the positive partial discharge signal obtained by passing through may be determined as the second peak value, respectively.

As an example, as shown in FIGS. 2A and 2B, x2 is the first peak value in the left signal of FIG. 2A measured by the first channel unit, and x3 is the first peak value in the right signal of FIG. 2A. Extracted to peak value. And it can be seen that x1- is the second peak value in the left signal of FIG. 2b measured by the second channel unit, and x4- is the second peak value in the right signal of FIG. 2b. That is, based on the present embodiment, in extracting the first peak value and the second peak value, the first (x1, x3) and the second (x2) of the original partial discharge signal shown in FIG. 2A are extracted. , x4) peak value.

In the last step iii), the polarity of the partial discharge signal is determined according to the result of the first peak value and the second peak value extracted in the step iv) (s140). In determining the polarity of the partial discharge signal, when the first peak value and the second peak value are compared, if the first peak value is larger than the second peak value, it is recognized as a positive partial discharge signal. If the second peak value is larger than the first peak value includes a configuration that outputs the determined polarity by recognizing the negative partial discharge signal. At this time, since the partial discharge signal is generated through charging / discharging, it is characterized in that it disappears while oscillating after the signal is generated. The case where the difference between the first peak value and the second peak value is 0 is not assumed. In addition, the above-described method of determining the signal polarity may be applied even when the original partial discharge signal and the original partial discharge signal inverted are measured as they are or the method of extracting the first peak value and the second peak value is different. This is possible.

Through this, it is possible to improve the accuracy of the analysis of the abnormal state of the stator winding through the accurate polarization of the partial discharge signal, and to improve the reliability of the partial discharge analysis by noise processing on the polarity signal that is different from the expected polarity.

Although the present invention has been illustrated and described by way of one embodiment and some drawings, those of ordinary skill in the art can modify the embodiment without departing from the spirit or spirit of the invention. You will see that.

Claims (8)

Partial discharge measuring device of a high voltage rotating machine,
A signal receiver for receiving a partial discharge signal generated from the high voltage rotating device;
A channel unit for measuring the received partial discharge signal as it is and inverting the received partial discharge signal;
A peak value extraction unit for obtaining a first peak value extracted from the signal measured as it is in the channel unit and a second peak value extracted from the inverted signal; And
A signal polarity determining unit for determining the polarity of the partial discharge signal according to the peak value extracting unit;
Partial discharge measurement device of a high voltage rotary device comprising a.
The partial discharge of the high voltage rotating device of claim 1, wherein the channel unit includes a first channel unit measuring the received partial discharge signal as it is and a second channel unit inverting and measuring the received partial discharge signal. Measuring device.
The method of claim 1, wherein the first peak value and the second peak value in the peak value extracting section are first from two positive partial discharge signals obtained by passing diodes for each of the two signals measured in the channel section. Partial discharge measuring device of a high voltage rotary machine, characterized in that determined by the peak value extracted second.
The polarity determining method according to any one of claims 1 to 3, wherein the signal polarity determining unit has a positive polarity when the first peak value is larger than the second peak value when comparing the first peak value and the second peak value. Recognizing a partial discharge signal, and if the second peak value is larger than the first peak value, the partial discharge measuring device of the high voltage rotary device, characterized in that it is recognized as a negative partial discharge signal.
As a method of measuring partial discharge of a high voltage rotating machine,
(a) receiving a partial discharge signal generated from a high voltage rotating machine;
(b) measuring the received partial discharge signal as it is while inverting the received partial discharge signal;
(c) extracting a first peak value from the measured signal as it is and extracting a second peak value from the inverted measured signal; And
(d) determining the polarity of the partial discharge signal according to the extracted first peak value and the second peak value;
Partial discharge measurement method of a high voltage rotary device comprising a.
The method of claim 5, wherein the received partial discharge signal is measured as it is in the first channel unit and the received partial discharge signal is inverted in the second channel unit.
The method of claim 5, wherein the extracted first peak value and the extracted second peak value are first extracted from two positive partial discharge signals obtained by passing diodes for each of the two signals measured in the channel unit. Partial discharge measurement method of a high voltage rotary machine, characterized in that determined by the peak value.
The polarity determination of the partial discharge signal is the first peak value is more than the second peak value when comparing the first peak value and the second peak value. If it is large, it is recognized as a positive partial discharge signal, and if the second peak value is greater than the first peak value, it is recognized as a negative partial discharge signal.

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