Multifunctional monitoring device for voltage and partial discharge measurement and monitoring method thereof

Abstract

The present invention discloses a multifunctional monitoring device for voltage and partial discharge measurement and a monitoring method thereof, comprising a measuring sensor module for measuring voltage and partial discharge signals, a voltage module connected to the measuring sensor module and used for collecting and processing power frequency voltage signals, a high frequency partial discharge module connected to the measuring sensor module and used for collecting and processing high frequency partial discharge signals, and a control module, wherein the control module calculates the severity of partial discharge according to the power frequency voltage signal and the high frequency partial discharge signal. The present invention utilizes the measuring sensor module installed inside the transformer, and while measuring the power frequency voltage, extracts the high frequency component contained in the measuring sensor module, and can achieve the purpose of measuring the partial discharge phenomenon inside the transformer without the need for an additional partial discharge sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of power system transformation, and in particular to a multifunctional monitoring device for voltage and partial discharge measurement and a monitoring method thereof. Background Art

[0002] Partial discharge (PD) is a key indicator of the insulation condition of high-voltage electrical equipment. Measuring PD can identify early-stage insulation defects, allowing for planned condition-based maintenance and preventing losses caused by faults. When PD occurs within a transformer, it generates electromagnetic waves, ultrasonic waves, and physical and chemical phenomena such as transformer oil decomposition products.

[0003] Partial discharge (PD) detection in terminal transformers is typically performed through oil chromatography and the installation of a high-frequency current sensor on the transformer grounding wire to detect PD signals. Alternatively, a built-in ultra-high frequency (UHF) sensor can be installed on the transformer's oil drain valve to measure PD. When PD occurs, a distorted high-voltage electric field is generated, generating charges on the transformer casing and metal surfaces, and forming high-frequency pulse current signals in the high-voltage circuit. However, high-frequency sensors are expensive and easily damaged when installed externally on the distribution transformer. Summary of the Invention

[0004] Purpose of the invention: The first purpose of the present invention is to provide a multifunctional monitoring device for voltage and partial discharge measurement, which realizes the detection capability of partial discharge signal by separating the partial discharge high-frequency pulse signal from the capacitor voltage divider voltage transformer.

[0005] A second object of the present invention is to provide a monitoring method for the multifunctional monitoring device for voltage and partial discharge measurement.

[0006] Technical solution: To achieve the above objectives, the present invention discloses a multifunctional monitoring device for voltage and partial discharge measurement, including a measurement sensor module connected in parallel with the high-voltage input terminal of the transformer and used to measure voltage and partial discharge signals, a voltage module connected to the measurement sensor module and used to collect and process power frequency voltage signals, a high-frequency partial discharge module connected to the measurement sensor module and used to collect and process high-frequency partial discharge signals, and a control module. The control module calculates the severity of partial discharge based on the power frequency voltage signal and the high-frequency partial discharge signal.

[0007] The measurement sensor module includes three single-phase capacitor voltage divider voltage transformers.

[0008] Preferably, the capacitor voltage divider voltage transformer includes a low-voltage capacitor with one end grounded, a high-voltage capacitor connected in series with the low-voltage capacitor, a vacuum discharge tube connected in parallel with the low-voltage capacitor, and a discharge resistor connected in parallel with the low-voltage capacitor.

[0009] Furthermore, the voltage module includes a voltage conditioning circuit for performing low-pass filtering and signal amplification on analog signals and a voltage acquisition module for converting analog signals of power frequency voltage signals into digital signals.

[0010] Preferably, the high-frequency partial discharge module includes a high-frequency partial discharge signal conditioning module for extracting and modulating the high-frequency partial discharge signal and a high-frequency partial discharge signal acquisition module for converting the analog signal of the high-frequency partial discharge signal into a digital signal.

[0011] Furthermore, the measurement sensor module is connected in parallel with the high voltage input terminal of the transformer.

[0012] Furthermore, the measurement sensor module is connected in parallel with the high voltage input terminal of the primary and secondary fusion column mounted circuit breaker.

[0013] The present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0014] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0015] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0016] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0017] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0018] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0019] (6) Calculate the amount of partial discharge activity on a daily basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within a daily cycle is:

[0020]

[0021] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0022]

[0023] Partial discharge activity P (d) Represents the severity of partial discharge within the corresponding day cycle, T (d) is the time corresponding to the day, the length unit is seconds;

[0024] (7) Output the maximum value of the partial discharge amplitude A within the daily cycle maxx , average value A Avex and pulse number N x .

[0025] The present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0026] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0027] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0028] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0029] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0030] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0031] (6) Calculate the amount of partial discharge activity on a monthly basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within a monthly cycle is:

[0032]

[0033] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0034]

[0035] Partial discharge activity P (m) Represents the severity of partial discharge in the corresponding monthly cycle, T (m) The time corresponding to the month, the length unit is seconds;

[0036] (7) Output the maximum partial discharge amplitude value A within the monthly cycle maxx , average value A Avex and pulse number N x .

[0037] The present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0038] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0039] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0040] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0041] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0042] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0043] (6) Calculate the amount of partial discharge activity on an annual basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within an annual cycle is:

[0044]

[0045] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0046]

[0047] Partial discharge activity P (y) Represents the severity of partial discharge in the corresponding annual cycle, T (y) is the time corresponding to the year, the unit of length is seconds;

[0048] (7) Output the maximum PD amplitude value A within the annual cycle maxx , average value A Avex and pulse number N x .

[0049] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0050] (1) The present invention utilizes a measurement sensor module installed inside the transformer to extract the high-frequency component contained in the low-voltage part while measuring the power frequency voltage. This allows the purpose of measuring the partial discharge phenomenon inside the transformer to be achieved without the need for an additional partial discharge sensor.

[0051] (2) The present invention simultaneously realizes the measurement of power frequency voltage and partial discharge, achieves a high degree of integration of measurement devices, and reduces the cost of transformer internal status monitoring;

[0052] (3) In addition to measuring partial discharge and outputting partial discharge pulse amplitude, pulse number and measurement timing data, the present invention also calculates the partial discharge activity amount, which is used to monitor the severity of partial discharge and issue an alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the present invention;

[0054] Figure 2 This is a single-phase wiring diagram of the measurement sensor module in the present invention;

[0055] Figure 3 This is a three-phase wiring diagram of the measurement sensor module in the present invention;

[0056] Figure 4 is a control flow chart of the present invention;

[0057] Figure 5 is a circuit diagram of the voltage conditioning circuit of the present invention;

[0058] Figure 6 This is a circuit diagram of the high-frequency partial discharge signal conditioning module of the present invention;

[0059] Figure 7 This is a circuit diagram of a high-pass filter circuit in a high-frequency partial discharge signal conditioning module of the present invention;

[0060] Figure 8 This is a circuit diagram of a low-pass filter circuit in a high-frequency partial discharge signal conditioning module of the present invention;

[0061] Figure 9 This is a circuit diagram of a rectifier circuit in a high-frequency partial discharge signal conditioning module of the present invention;

[0062] Figure 10 This is a circuit diagram of an amplifier circuit in a high-frequency partial discharge signal conditioning module of the present invention;

[0063] Figure 11 This is a circuit diagram of the widening circuit in the high-frequency partial discharge signal conditioning module of the present invention. DETAILED DESCRIPTION

[0064] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0065] Example 1

[0066] like Figure 1 and Figure 2 As shown, the present invention provides a multifunctional monitoring device for voltage and partial discharge measurement, including a measuring sensor module, a voltage module, a high-frequency partial discharge module, and a communication module. The measuring sensor module is connected in parallel with the high-voltage input terminal of the transformer, and is used to measure voltage and partial discharge signals. The measuring sensor module includes three single-phase capacitor-divider voltage transformers, which include a low-voltage capacitor with one end grounded, a high-voltage capacitor connected in series with the low-voltage capacitor, a vacuum discharge tube connected in parallel with the low-voltage capacitor, and a discharge resistor connected in parallel with the low-voltage capacitor. Figure 2 As shown, a 10kV high-voltage capacitor is connected in series with a low-voltage capacitor. The other end of the low-voltage capacitor is grounded. The measurement signal is led from both ends of the low-voltage capacitor. A vacuum discharge tube and a bleeder resistor are connected in parallel to prevent high voltage caused by breakdown of the high-voltage capacitor. Figure 3 The diagram shows a three-phase wiring diagram. The measurement sensor module is packaged integrally and connected in parallel to the high-voltage input of a 10kV oil-immersed distribution transformer. The module is installed within the 10kV oil-immersed distribution transformer, insulated from other 10kV live elements by transformer insulating oil. The measurement sensor module's signal is extracted from the 10kV distribution transformer and connected to the voltage module and high-frequency partial discharge module.

[0067] The voltage module is connected to the measurement sensor module. The voltage module is responsible for processing and collecting the input power frequency voltage signal. The voltage module includes a voltage conditioning circuit and a voltage acquisition module. The voltage conditioning circuit is responsible for low-pass filtering and signal amplification of the input analog signal. The voltage acquisition module is responsible for converting the analog signal into a digital signal. The voltage acquisition module is composed of an analog-to-digital conversion chip and related peripheral circuits, and is controlled by the control module for data acquisition.

[0068] Among them, the voltage conditioning circuit is as follows Figure 5 As shown, the voltage conditioning circuit is divided into three stages: the first stage from UB_H_1 to UB_H_2 is a voltage follower; the second stage from UB_H_2 to UB_H_3 is a proportional operational amplifier with an amplification factor of 6 times; the third stage from UB_H_3 to UB_H_P is a non-inverting adder; UB_H_P is input to the sampling module for signal acquisition.

[0069] In the present invention, a signal is introduced from the measurement sensor module to the high-frequency partial discharge module. The high-frequency partial discharge module includes a high-frequency partial discharge signal conditioning module and a high-frequency partial discharge signal acquisition module. The high-frequency partial discharge signal conditioning module is responsible for signal filtering and amplification to extract high-frequency partial discharge pulses from the signal. It is also responsible for modulating the partial discharge signal, rectifying the partial discharge pulse signal into a positive pulse signal. To reduce the sampling frequency requirement, the pulse signal is widened in the circuit. The high-frequency partial discharge signal acquisition module is responsible for converting the analog signal into a digital signal. The high-frequency partial discharge signal acquisition module consists of an analog-to-digital conversion chip and related peripheral circuits, and is controlled by a control module for data acquisition.

[0070] like Figure 6 As shown, the high-frequency partial discharge signal conditioning module consists of a low-pass filter circuit, a high-pass filter circuit, a rectifier circuit, an amplifier circuit and a widening circuit.

[0071] Among them, the high-pass filter circuit is used to filter out the power frequency signal, and the low-pass filter circuit is used to filter out the unnecessary high-frequency components. The high-pass and low-pass filter circuits are respectively set to make the output signal bandwidth within the range of 500kHz to 10MHz. In this embodiment, a typical RLC filter circuit is used. The filter circuit principle is as follows Figure 7 and Figure 8 In this embodiment, the rectifier circuit is designed as a full-wave rectifier circuit composed of two operational amplifiers, as shown in FIG. Figure 9 In this embodiment, the amplifier circuit is used to amplify the input signal, such as Figure 10 In this embodiment, the stretching circuit is used to stretch the narrow pulse signal in time. The circuit principle is as follows: Figure 11 shown.

[0072] The control module is responsible for initializing the system, controlling the voltage module and the high-frequency partial discharge module to work as required, and processing the collected voltage and high-frequency partial discharge digital data. The multifunctional monitoring device for voltage and partial discharge measurement is connected to the host computer through the communication module, and provides the host computer with the measured values ​​of partial discharge and voltage, and proposes the amount of partial discharge activity as an evaluation index for the severity and aging of partial discharge. The present invention simultaneously realizes the measurement of power frequency voltage and partial discharge, achieves a high degree of integration of measuring devices, and reduces the cost of transformer internal status monitoring; it can also be used for partial discharge monitoring inside the primary and secondary fusion column circuit breaker equipment, and the measurement sensor module is connected in parallel with the high-voltage input terminal of the primary and secondary fusion column circuit breaker.

[0073] like Figure 4 As shown, the present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0074] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0075] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0076] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0077] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0078] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0079] (6) Calculate the amount of partial discharge activity on a daily basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within a daily cycle is:

[0080]

[0081] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0082]

[0083] Partial discharge activity P (d) Represents the severity of partial discharge within the corresponding day cycle, T (d) is the time corresponding to the day, the length unit is seconds;

[0084] (7) Output the maximum value of the partial discharge amplitude A within the daily cycle maxx , average value A Avex and pulse number N x .

[0085] like Figure 4 As shown, the present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0086] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0087] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0088] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0089] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0090] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0091] (6) Calculate the amount of partial discharge activity on a monthly basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within a monthly cycle is:

[0092]

[0093] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0094]

[0095] Partial discharge activity P (m) Represents the severity of partial discharge in the corresponding monthly cycle, T (m) The time corresponding to the month, the length unit is seconds;

[0096] (7) Output the maximum partial discharge amplitude value A within the monthly cycle maxx , average value A Avex and pulse number N x .

[0097] like Figure 4 As shown, the present invention provides a monitoring method for a multifunctional monitoring device for voltage and partial discharge measurement, comprising the following steps:

[0098] (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal;

[0099] (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal;

[0100] (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found. The phase value at the time corresponding to the pulse maximum value is calculated and recorded;

[0101] (4) Divide 0-1000mV and 0-360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval;

[0102] (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value of the partial discharge amplitude A collected within the time interval maxx , average value A Avex and pulse number N x , where subscript x = {1, 2, ..., M}, represents the xth time period;

[0103] (6) Calculate the amount of partial discharge activity on an annual basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within an annual cycle is:

[0104]

[0105] Where T p Indicates the sum of the periods of partial discharge pulses, in seconds;

[0106]

[0107] Partial discharge activity P (y) Represents the severity of partial discharge in the corresponding annual cycle, T (y) is the time corresponding to the year, the unit of length is seconds;

[0108] (7) Output the maximum PD amplitude value A within the annual cycle maxx , average value A Avex and pulse number N x .

Claims

1. A monitoring method of a multifunctional monitoring device for voltage and partial discharge measurement, characterized in that: The multifunctional monitoring device for voltage and partial discharge measurement comprises a measuring sensor module for measuring voltage and partial discharge signals, a voltage module connected to the measuring sensor module and used for collecting and processing power frequency voltage signals, a high frequency partial discharge module connected to the measuring sensor module and used for collecting and processing high frequency partial discharge signals, and a control module, wherein the control module calculates the severity of partial discharge according to the power frequency voltage signal and the high frequency partial discharge signal; the measuring sensor module comprises three single-phase capacitor voltage transformers, wherein the capacitor voltage transformer comprises a low voltage capacitor with one end grounded, a high voltage capacitor connected in series with the low voltage capacitor, a vacuum discharge tube connected in parallel with the low voltage capacitor, and a discharge resistor connected in parallel with the low voltage capacitor; the high frequency partial discharge module comprises a high frequency partial discharge signal conditioning module for extracting and modulating high frequency partial discharge signals and a high frequency partial discharge signal acquisition module for converting analog signals of high frequency partial discharge signals into digital signals, wherein the high frequency partial discharge signal conditioning module comprises a low pass filter circuit, a high pass filter circuit, a rectifier circuit, an amplifier circuit, and a widening circuit; The monitoring method includes the following steps: (1) The control module controls the voltage module to collect the power frequency voltage signal, and controls the high frequency partial discharge module to collect the high frequency partial discharge signal; (2) The control module extracts the fundamental signal through Fourier transform based on the current and historical data of the power frequency voltage signal collected by the voltage module, calculates and obtains the phase, frequency and effective value of the voltage at the current moment, and uses the obtained phase value as the synchronization reference of the high-frequency partial discharge signal; (3) The control module determines whether there is a pulse in the selected interval based on the current and historical data of the high-frequency partial discharge signal collected by the high-frequency partial discharge module. If there is a pulse, the maximum value is obtained and the position of the pulse maximum value is found, and the phase value at the time corresponding to the pulse maximum value is calculated and recorded; (4) Divide 0 to 1000 mV and 0 to 360° into M and N equal parts respectively, and record the amplitude, phase, and time of the partial discharge pulse whose time interval to the current moment is the set time interval; (5) From the start of work, according to the set time period T x , every time the set time period comes, count and record the maximum value A of the partial discharge amplitude collected within the time interval maxx , average value A Avex And the number of pulses N x , where the subscript x = {1, 2, ..., M}, represents the xth time period; (6) Calculate the amount of partial discharge activity on a daily, monthly, or yearly basis. When the threshold is exceeded, an alarm is issued. The calculation formula for the amount of partial discharge activity within a daily, monthly, or yearly period is: Where T p Indicates the sum of the periods during which partial discharge pulses occur; Partial discharge activity P (d、m、y) Represents the severity of partial discharge in the corresponding day, month, or year cycle, T (d、m、y) For the time corresponding to days, months, and years, the unit of length is seconds; (7) Output the maximum value of the partial discharge amplitude A within the daily, monthly and annual cycle maxx , average value A Avex And the number of pulses N x .

2. The monitoring method of a multifunctional monitoring device for voltage and partial discharge measurement according to claim 1, characterized in that: The voltage module includes a voltage conditioning circuit for low-pass filtering and signal amplification of analog signals and a voltage acquisition module for converting analog signals of power frequency voltage signals into digital signals.

3. The monitoring method of a multifunctional monitoring device for voltage and partial discharge measurement according to claim 1, characterized in that: The measuring sensor module is connected in parallel with the high voltage input terminal of the transformer.

4. The monitoring method of the multifunctional monitoring device for voltage and partial discharge measurement according to claim 1, characterized in that: The measuring sensor module is connected in parallel with the high voltage input terminal of the primary and secondary fusion column mounted circuit breaker.

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