CN107797033B - Detection platform for simulating partial discharge test of transformer - Google Patents
Detection platform for simulating partial discharge test of transformer Download PDFInfo
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- CN107797033B CN107797033B CN201710909404.6A CN201710909404A CN107797033B CN 107797033 B CN107797033 B CN 107797033B CN 201710909404 A CN201710909404 A CN 201710909404A CN 107797033 B CN107797033 B CN 107797033B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The invention relates to the technical field of partial discharge detection, in particular to a detection platform for simulating a partial discharge test of a transformer, which comprises a detection sensor, a signal processing unit, an A/D conversion unit, a Central Processing Unit (CPU), a voltage dividing circuit unit, an external synchronous voltage input unit, a voltage detection unit, a synchronous signal forming circuit unit, an embedded industrial computer and a power supply unit, wherein the detection sensor is connected with the signal processing unit; the invention has the advantage of multi-channel synchronous detection, and can be optionally provided with an impedance matching unit, a high-frequency broadband transformer, an ultrasonic detector, an antenna amplifier and other detection sensors, and each channel can acquire signals from a plurality of measuring points of the tested equipment simultaneously by selecting an appropriate detection sensor. The invention can conveniently finish simultaneous measurement of multiple discharge models or simultaneous measurement of multiple positions of a single discharge model, can analyze discharge properties, identify discharge types and determine the space position for generating partial discharge while detecting the partial discharge quantity.
Description
Technical Field
The invention relates to the technical field of partial discharge detection, in particular to a detection platform for simulating a partial discharge test of a transformer.
Background
Partial discharge is one of important characteristic parameters reflecting insulation performance of power transformer equipment, and is a sign and a manifestation form of insulation degradation of the power transformer equipment, and is a cause of further degradation of equipment insulation. In addition, the insulation fault is an important reason for influencing the safe and stable operation of the power transformer, so that the detection of the partial discharge characteristic of the power transformer equipment can help to discover the insulation defect in the early stage, and through timely fault diagnosis and state evaluation, specific treatment measures are adopted to avoid the malignant development of the power transformer equipment.
At present, the real partial discharge inside the transformer can be simulated through a power transformer partial discharge simulation test system, so that the technical means of recording, checking and researching characteristic parameters such as detection frequency, sensitivity, linearity, pulse counting, dynamic range, diagnosis and identification and the like of various partial discharge monitoring devices and detection instruments aiming at the partial discharge are realized, and the quality control, health level and use efficiency of monitoring equipment are improved.
Disclosure of Invention
In order to solve the problems, the invention provides a detection platform for simulating a partial discharge test of a transformer, which comprises the following specific technical scheme:
the detection platform for simulating the partial discharge test of the transformer comprises a detection sensor, a signal processing unit, an A/D conversion unit, a Central Processing Unit (CPU), a voltage dividing circuit unit, an external synchronous voltage input unit, a voltage detection unit, a synchronous signal forming circuit unit, an embedded industrial computer and a power supply unit;
the detection sensor is connected with the signal processing unit, the signal processing unit is respectively connected with the CPU and the A/D conversion unit, and the A/D conversion unit is connected with the embedded industrial computer;
the voltage dividing circuit unit is connected with the external synchronous voltage input unit, the external synchronous voltage input unit is connected with the voltage detection unit, the voltage detection unit is connected with the central processing unit CPU, the central processing unit CPU is connected with the embedded industrial computer, and the synchronous signal forming circuit unit is respectively connected with the central processing unit CPU unit and the A/D conversion unit;
the detection sensor is used for detecting partial discharge signals and transmitting the detected partial discharge signals to the signal processing unit, the signal processing unit is used for amplifying and filtering the partial discharge signals and inputting the processed partial discharge signals to the A/D conversion unit, the A/D conversion unit is used for converting the partial discharge signals processed by the signal processing unit into digital signals and inputting the digital signals to the embedded industrial computer, and the embedded industrial computer is used for processing the digital signals and realizing waveform display, waveform analysis, digital display and detection report generation; the CPU unit is used for controlling gain and frequency band selection of the signal processing unit, measuring the test voltage signal detected by the voltage detection unit, and detecting the synchronous signal and the selection synchronous signal formed by the synchronous pulse forming circuit;
the external synchronous voltage input unit, the central processing unit CPU, the power supply unit and the synchronous signal forming circuit unit are respectively connected with the single-pole double-throw relay;
the voltage dividing circuit unit is used for dividing the test voltage signal into two paths of test voltage signals, one path of test voltage signal is transmitted to the voltage detection unit through the outer synchronous voltage input unit to detect the test voltage signal, the other path of test voltage signal is used as an outer synchronous signal, and the power supply unit is used as an inner synchronous signal; the CPU selects an external synchronous signal or an internal synchronous signal to be input into the synchronous signal forming circuit unit by controlling the single-pole double-throw relay to provide a phase reference for determining the phase of the partial discharge signal.
Further, the signal processing unit comprises an isolation protection module, a high-pass filtering module, a multiplying power attenuation module, an isolation amplifier, a primary filtering module, a secondary filtering module, an amplifier and a signal driver;
the isolation protection module comprises an isolation transformer and a gas discharge tube and is used for isolating a high-voltage discharge signal on the detection loop;
the high-pass filtering module is used for filtering interference signals outside the detection frequency band, and the passband range is 10 kHz-1 MHz;
the multiplying power attenuation module is used for attenuating the signal to enable the signal to meet the voltage input range of the back-end circuit, and the attenuation range is 0-60 dB;
the isolation amplifier comprises an isolation step-up transformer and is used for amplifying signals to enable the signals to meet the electric acquisition voltage range of the A/D conversion unit;
the primary filtering module comprises a high-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet the partial discharge measurement standard, and the passband range is 20 kHz-1 MHz;
the secondary filtering module comprises a low-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet the partial discharge measurement standard, and the passband range is 10 kHz-400 kHz;
the amplifier comprises an operational amplifier, a first amplifier and a second amplifier, wherein the operational amplifier is used for amplifying signals to enable the signals to meet the acquisition voltage range of the A/D conversion unit;
the signal driver includes an operational amplifier for increasing the load carrying capacity of the output signal;
the isolation protection module, the high-pass filtering module, the multiplying power attenuation module, the isolation amplifier, the primary filtering module, the secondary filtering module, the amplifier and the signal driver are sequentially connected.
Further, the A/D conversion unit adopts a chip AD8031, and the resolution is 12 bits.
Further, the CPU adopts an intel Atom D425 processor with a main frequency of 1.8GHz.
Further, the CPU comprises a gain control module, a frequency band selection module, a voltage measurement module, an internal and external synchronous selection module and a synchronous detection module;
the gain control module is connected with the signal processing unit and used for controlling the gain multiple of the signal processing unit;
the frequency band selection module is connected with the signal processing unit and is used for selecting the frequency band of the signal processing unit;
the voltage measuring module is connected with the voltage detecting unit and is used for monitoring test voltage signals;
the internal and external synchronization selection module is used for switching the synchronous input signals and selecting external synchronization signals or internal synchronization signals;
the synchronous detection module is connected with the synchronous pulse forming circuit unit and is used for detecting the partial discharge synchronous signal generated by the synchronous pulse forming circuit unit.
Further, the synchronous pulse forming circuit unit comprises an input isolation protection module, a band-pass filtering module, an amplitude limiting module, a zero crossing detection module, a synchronous pulse forming module and a driver;
the input isolation protection module comprises an isolation transformer and a gas discharge tube and is used for isolating a high-voltage pulse signal on the detection loop;
the band-pass filtering module comprises an active filter and is used for removing interference signals outside the frequency range of the synchronous signals, wherein the frequency range of the synchronous signals is 50-400 Hz;
the amplitude limiting module comprises a TVS transient suppression diode and is used for absorbing high-voltage signals and ensuring that the passing signals are within the acquisition voltage range of the A/D conversion unit;
the zero-crossing detection module comprises a voltage comparator and is used for realizing zero-crossing detection and converting a sine wave signal into a square wave signal;
the synchronous pulse forming module comprises an NE555 timer and is used for shaping the square wave signal output by the zero crossing detection module to form a synchronous pulse signal;
the driver includes an operational amplifier for increasing the load carrying capacity of the output signal;
the input isolation protection module, the band-pass filtering module, the amplitude limiting module, the zero-crossing detection module, the synchronous pulse forming module and the driver are sequentially connected.
Further, the main frequency of the CPU of the embedded industrial computer is 1.6GHz or more, and the embedded industrial computer comprises an embedded integrated keyboard, a liquid crystal display screen, a mouse interface, a keyboard interface, a CRT interface, a USB interface, a printer interface and a hard disk.
Further, the CPU comprises an RS232 interface, and the CPU is connected with the embedded industrial computer through the RS232 interface.
Further, the voltage output from the power supply unit was 220V, and the frequency was 50Hz.
Further, the amplitude of the test voltage signal is 0-200V, and the frequency is 50-400 Hz.
The invention provides a partial discharge detection platform for simulating a partial discharge test of a transformer, which has the advantage of synchronous detection of multiple channels, and can be optionally provided with an impedance matching unit, a high-frequency broadband transformer, an ultrasonic detector, an antenna amplifier and other detection sensors, wherein each channel can acquire signals from multiple measuring points of tested equipment simultaneously by selecting an appropriate detection sensor. The invention can conveniently finish simultaneous measurement of multiple discharge models or simultaneous measurement of multiple positions of a single discharge model, can analyze discharge properties, identify discharge types and determine the space position for generating partial discharge while detecting the partial discharge quantity. Through application, test and research of the invention on the simulation transformer partial discharge test system, data and experience of the partial discharge live detection of the large transformer can be accumulated, and live assessment and diagnosis of the partial discharge part of the large transformer are possible.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an isolation protection module of a signal processing unit according to the present invention;
fig. 3 is a schematic structural diagram of a high-pass filtering module of the signal processing unit according to the present invention;
fig. 4 is a schematic structural diagram of a multiplying power attenuation module of the signal processing unit according to the present invention;
FIG. 5 is a schematic diagram of an isolation amplifier of a signal processing unit according to the present invention;
FIG. 6 is a schematic diagram of a first stage filter module of the signal processing unit according to the present invention;
fig. 7 is a schematic structural diagram of a two-stage filtering module of the signal processing unit according to the present invention;
fig. 8 is a schematic diagram of an amplifier of the signal processing unit of the present invention;
fig. 9 is a schematic diagram of a driver of a signal processing unit according to the present invention;
FIG. 10 is a schematic diagram of an input isolation protection module of a synchronous pulse forming circuit unit according to the present invention;
FIG. 11 is a schematic diagram of a band-pass filter module of a synchronous pulse forming circuit unit according to the present invention;
fig. 12 is a schematic diagram of a zero-crossing detection module of a synchronous pulse forming circuit unit according to the present invention;
fig. 13 is a schematic diagram of a driver of a synchronous pulse forming circuit unit according to the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description of the invention, taken in conjunction with the accompanying drawings and specific examples:
the detection platform for simulating the partial discharge test of the transformer comprises a detection sensor, a signal processing unit, an A/D conversion unit, a Central Processing Unit (CPU), a voltage dividing circuit unit, an external synchronous voltage input unit, a voltage detection unit, a synchronous signal forming circuit unit, an embedded industrial computer and a power supply unit;
the detection sensor is connected with the signal processing unit, the signal processing unit is respectively connected with the CPU and the A/D conversion unit, and the A/D conversion unit is connected with the embedded industrial computer;
the voltage dividing circuit unit is connected with the external synchronous voltage input unit, the external synchronous voltage input unit is connected with the voltage detection unit, the voltage detection unit is connected with the central processing unit CPU, the central processing unit CPU is connected with the embedded industrial computer, and the synchronous signal forming circuit unit is respectively connected with the central processing unit CPU unit and the A/D conversion unit;
the detection sensor is used for detecting partial discharge signals and transmitting the detected partial discharge signals to the signal processing unit, the signal processing unit is used for amplifying and filtering the partial discharge signals, the processed partial discharge signals are input to the A/D conversion unit, the A/D conversion unit is used for converting the partial discharge signals processed by the signal processing unit into digital signals and inputting the digital signals to the embedded industrial computer, and the embedded industrial computer is used for processing the digital signals and realizing waveform display, waveform analysis, digital display and detection report generation; the CPU unit is used for controlling gain and frequency band selection of the signal processing unit, measuring the test voltage signal detected by the voltage detection unit, and detecting the synchronous signal and the selection synchronous signal formed by the synchronous pulse forming circuit;
the external synchronous voltage input unit, the central processing unit CPU, the power supply unit and the synchronous signal forming circuit unit are respectively connected with the single-pole double-throw relay;
the voltage dividing circuit unit is used for dividing the test voltage signal into two paths of test voltage signals, one path of test voltage signal is transmitted to the voltage detection unit through the outer synchronous voltage input unit to detect the test voltage signal, the other path of test voltage signal is used as an outer synchronous signal, and the power supply unit is used as an inner synchronous signal; the CPU selects the external synchronous signal or the internal synchronous signal to be input into the synchronous signal forming circuit unit by controlling the single-pole double-throw relay to provide a phase reference for determining the phase of the partial discharge signal. The single pole double throw relay comprises A, B, C three electric shocks, wherein the electric shock C is selected as an external synchronous signal when the electric shock A is connected, and the electric shock C is selected as an internal synchronous signal when the electric shock B is connected.
The detection sensor is one of a high-frequency broadband transformer, an ultrasonic detector and an antenna amplifier.
The signal processing unit comprises an isolation protection module, a high-pass filtering module, a multiplying power attenuation module, an isolation amplifier, a primary filtering module, a secondary filtering module, an amplifier and a signal driver.
The isolation protection module comprises an isolation transformer T1 and a gas discharge tube D1, and is used for isolating high-voltage discharge signals on a detection loop, such as high-voltage pulses generated during equipment breakdown, flashover or lightning strike and the like, so as to prevent the high-voltage discharge signals from damaging a circuit, specifically, the isolation is realized through the isolation transformer, pulse signals are absorbed through the gas discharge tube for protection, as shown in fig. 2, wherein D1 is a gas discharge tube with breakdown voltage of 100V, T1 is the isolation transformer, and the voltage transformation ratio is 1:1.
the high-pass filtering module is used for filtering interference signals outside the detection frequency band, and is specifically realized by utilizing an LC filtering principle, as shown in fig. 3, C1 and C2 are 330nF capacitors, L1 is 470uH inductors, and the passband range is 10 kHz-1 MHz.
The multiplying power attenuation module is used for attenuating the signal to enable the signal to meet the voltage input range of the back-end circuit, and the signal is realized by adopting the principle of resistor voltage division, wherein the attenuation range is 0-60 dB; as shown in fig. 4, JD1, JD2, JD3, and JD4 are relays, R1, R2, R4, R5 are 50 ohm resistors, and R3, R6 are 250 ohm resistors.
The isolation amplifier includes an isolation step-up transformer for amplifying a signal so that it satisfies a voltage range of the electrical collection of the a/D conversion unit, as shown in fig. 5, T2 is the isolation step-up transformer, and a voltage transformation ratio is 1:3, the magnification is 3 times.
The primary filtering module comprises a high-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet IEC60270 partial discharge measurement standards, and the passband range is 20 kHz-1 MHz; the implementation is specifically realized by using the LC filtering principle, as shown in FIG. 6, wherein C3 and C4 are 150nF capacitors, L2 is 220uH inductor, and JD5 and JD6 are relays.
The secondary filtering module comprises a low-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet the partial discharge measurement standard, and the passband range is 10 kHz-400 kHz; the implementation is specifically realized by using the LC filtering principle, as shown in FIG. 7, wherein L3 and L4 are 20uH inductors, C5 is 15nF capacitors, and JD7 and JD8 are relays. The passband range is 20 kHz-400 kHz after the combination of the two stages of filters.
The amplifier includes an operational amplifier for amplifying weak signals to meet the acquisition voltage range of the a/D conversion unit, specifically, as shown in fig. 8, the operational amplifier is an AD8031, R7 is a 1k resistor, R8 is a 100k resistor, and the amplification factor is 100 times.
The signal driver includes an operational amplifier for increasing the load carrying capacity of the output signal, and specifically, the load carrying capacity of the output signal is increased by using the following function of the operational amplifier, as shown in fig. 9, U2 is an operational amplifier AD8031.
The isolation protection module, the high-pass filtering module, the multiplying power attenuation module, the isolation amplifier, the primary filtering module, the secondary filtering module, the amplifier and the signal driver are sequentially connected; the isolation protection module is connected with the detection sensor, and the signal driver is connected with the A/D conversion unit. The invention is provided with 4 signal processing units, and can process 4 paths of partial discharge signals simultaneously.
The CPU adopts an intel Atom D425 processor with a main frequency of 1.8GHz. The CPU comprises a gain control module, a frequency band selection module, a voltage measurement module, an internal and external synchronous selection module and a synchronous detection module.
The gain control module is connected with the multiplying power attenuation module of the signal processing unit and used for controlling the multiplying power of the signal processing unit; the gain control module controls the on-off of the relays JD1, JD2, JD3 and JD4 in the figure 4, so as to realize the control of the gain; when the signal is stronger, the relays JD1, JD2, JD3 and JD4 are controlled to be switched to a resistance attenuation network, so that the attenuation of the signal is realized; when the signal is weaker, the control relay skips the resistance attenuation network, namely, the direct conduction does not attenuate the signal.
The frequency band selection module is respectively connected with the primary filtering module and the secondary filtering module of the signal processing unit and is used for selecting the frequency band of the signal processing unit; the band selection module controls the on-off of the relays JD5, JD6, JD7, JD8 shown in fig. 6 and 7, thereby realizing the selection of the filter. When the interference signal is large and needs to be filtered, the relays JD5, JD6, JD7 and JD8 are controlled to be switched to a filter circuit, so that high-pass filtering and low-pass filtering are realized; when filtering is not needed, the control relay skips the filter circuit, i.e. is turned on directly.
The voltage measuring module is connected with the voltage detecting unit and is used for monitoring test voltage signals; the test voltage signal is introduced into a voltage detection module through a capacitive voltage divider of the front-end voltage division circuit module, and the voltage detection module comprises a voltage transformer and an A/D converter; the test voltage signals are converted into low-voltage signals which can be collected by the A/D converter of the voltage detection module through the voltage transformer of the voltage detection module, and finally the low-voltage signals are collected through the A/D converter of the voltage detection module.
The internal and external synchronous selection module is used for controlling the single-pole double-throw relay to switch synchronous input signals and selecting external synchronous signals or internal synchronous signals; when an external synchronous signal exists in the test, the internal and external synchronous selection module controls the electric shock A and the electric shock C of the single-pole double-throw relay to be connected and switched to an external synchronous input mode, and at the moment, the A/D conversion unit performs trigger acquisition according to the external synchronous signal; when the external synchronization signal is not generated, the internal and external synchronization selection module controls the electric shock B and the electric shock C of the single-pole double-throw relay to be connected, and the internal synchronization mode is switched to, namely, the power supply module is used as a trigger signal to trigger acquisition.
The synchronous detection module is connected with the synchronous pulse forming circuit unit and is used for detecting the partial discharge synchronous signal generated by the synchronous pulse forming circuit unit. The synchronous detection module triggers the acquisition after detecting the rising edge of the synchronous pulse, completes the acquisition of partial discharge signals according to the set duration, and then analyzes.
The synchronous pulse forming circuit unit comprises an input isolation protection module, a band-pass filtering module, a limiting module, a zero crossing detection module, a synchronous pulse forming module and a driver.
The input isolation protection module comprises an isolation transformer and a gas discharge tube, and is used for isolating high-voltage pulse signals on a detection loop, preventing the high-voltage pulse signals on the test loop from damaging a circuit, isolating the circuit through the isolation transformer, and enabling the gas discharge tube to absorb the pulse signals for protection, wherein D2 is the gas discharge tube with breakdown voltage of 20V, T3 is a voltage transformer with voltage transformation ratio of 1:1, and high-voltage pulses in the synchronous signals are absorbed through the gas discharge tube D2 and isolated through the voltage transformer T3, so that the safe operation of the circuit at the back is ensured.
The band-pass filtering module comprises an active filter for removing interference signals outside the frequency range of the synchronous signals, wherein the frequency range of the synchronous signals is 50-400 Hz; specifically, an active filter is used for removing interference signals outside the frequency range of 50-400Hz of the synchronous signals, so that stable synchronous signals are ensured to be output; as shown in fig. 11, R9 is a 3k resistor, C6 is a 100nF capacitor, and U3 is an operational amplifier AD8031.
The amplitude limiting module comprises a TVS transient suppression diode and is used for absorbing high-voltage signals and ensuring that the passing signals are within the acquisition voltage range of the A/D conversion unit; the TVS transient suppression diode is SA5.0CA TVS transient suppression diode, and signals with the amplitude of more than 5V are limited to enter the circuit.
The zero-crossing detection module comprises a voltage comparator and is used for realizing zero-crossing detection and converting a sine wave signal into a square wave signal; specifically, zero-crossing detection is realized by utilizing the voltage comparator function of the operational amplifier, low level is output when the signal amplitude is higher than 0V, high level is output when the signal amplitude is lower than 0V, and the conversion of a sine wave signal into a square wave signal is realized, wherein U4 is the operational amplifier AD8031, and R10 is a 10k resistor as shown in FIG. 12.
The synchronous pulse forming module comprises an NE555 timer and is used for shaping the square wave signal output by the zero crossing detection module to form a synchronous pulse signal.
The driver includes an operational amplifier for increasing the load carrying capacity of the output signal; as shown in fig. 13, U5 is an AD8031 operational amplifier, and specifically, the load-carrying capacity of the output signal is increased by the follower circuit of the operational amplifier AD 8031U 5.
The input isolation protection module, the band-pass filtering module, the amplitude limiting module, the zero crossing detection module, the synchronous pulse forming module and the driver are sequentially connected, and the driver is connected with the A/D conversion unit.
The A/D conversion unit adopts an AD conversion chip AD8031, and the resolution is 12 bits.
The main frequency of CPU of the embedded industrial computer is 1.6GHz or above, including embedded integrated keyboard, liquid crystal display, mouse interface, keyboard interface, CRT interface, USB interface, printer interface, hard disk; the embedded integrated keyboard comprises a touch pad and a keyboard.
The CPU comprises an RS232 interface, is connected with the embedded industrial computer through the RS232 interface, and is also connected with keys and an indicator lamp.
The voltage output by the power supply unit is 220V, and the frequency is 50Hz.
The amplitude of the test voltage signal is 0-200V, and the frequency is 50-400 Hz.
The present invention is not limited to the specific embodiments described above, but is to be construed as being limited to the preferred embodiments of the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a test platform for simulating transformer partial discharge test which characterized in that: the device comprises a detection sensor, a signal processing unit, an A/D conversion unit, a Central Processing Unit (CPU), a voltage dividing circuit unit, an external synchronous voltage input unit, a voltage detection unit, a synchronous pulse forming circuit unit, an embedded industrial computer and a power supply unit;
the detection sensor is connected with the signal processing unit, the signal processing unit is respectively connected with the CPU and the A/D conversion unit, and the A/D conversion unit is connected with the embedded industrial computer;
the voltage dividing circuit unit is connected with the external synchronous voltage input unit, the external synchronous voltage input unit is connected with the voltage detection unit, the voltage detection unit is connected with the central processing unit CPU, the central processing unit CPU is connected with the embedded industrial computer, and the synchronous pulse forming circuit unit is respectively connected with the central processing unit CPU unit and the A/D conversion unit;
the detection sensor is used for detecting partial discharge signals and transmitting the detected partial discharge signals to the signal processing unit, the signal processing unit is used for amplifying and filtering the partial discharge signals and inputting the processed partial discharge signals to the A/D conversion unit, the A/D conversion unit is used for converting the partial discharge signals processed by the signal processing unit into digital signals and inputting the digital signals to the embedded industrial computer, and the embedded industrial computer is used for processing the digital signals and realizing waveform display, waveform analysis, digital display and detection report generation; the CPU unit is used for controlling gain and frequency band selection of the signal processing unit, measuring the test voltage signal detected by the voltage detection unit, and detecting the synchronous signal and the selection synchronous signal formed by the synchronous pulse forming circuit unit;
the external synchronous voltage input unit, the central processing unit CPU, the power supply unit and the synchronous pulse forming circuit unit are respectively connected with the single-pole double-throw relay;
the voltage dividing circuit unit is used for dividing the test voltage signal into two paths of test voltage signals, one path of test voltage signal is transmitted to the voltage detection unit through the outer synchronous voltage input unit to detect the test voltage signal, the other path of test voltage signal is used as an outer synchronous signal, and the power supply unit is used as an inner synchronous signal; the CPU selects an external synchronous signal or an internal synchronous signal to be input into the synchronous pulse forming circuit unit by controlling the single-pole double-throw relay to provide a phase reference for determining the phase of the partial discharge signal;
the signal processing unit comprises an isolation protection module, a high-pass filtering module, a multiplying power attenuation module, an isolation amplifier, a primary filtering module, a secondary filtering module, an amplifier and a signal driver;
the isolation protection module comprises an isolation transformer and a gas discharge tube and is used for isolating a high-voltage discharge signal on the detection loop;
the high-pass filtering module is used for filtering interference signals outside the detection frequency band, and the passband range is 10 kHz-1 MHz;
the multiplying power attenuation module is used for attenuating the signal to enable the signal to meet the voltage input range of the back-end circuit, and the attenuation range is 0-60 dB;
the isolation amplifier comprises an isolation step-up transformer and is used for amplifying signals to enable the signals to meet the electric acquisition voltage range of the A/D conversion unit;
the primary filtering module comprises a high-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet the partial discharge measurement standard, and the passband range is 20 kHz-1 MHz;
the secondary filtering module comprises a low-pass filter, and is used for filtering interference signals and enabling the frequency band of the signals to meet the partial discharge measurement standard, and the passband range is 10 kHz-400 kHz;
the amplifier comprises an operational amplifier, a first amplifier and a second amplifier, wherein the operational amplifier is used for amplifying signals to enable the signals to meet the acquisition voltage range of the A/D conversion unit;
the signal driver includes an operational amplifier for increasing the load carrying capacity of the output signal;
the isolation protection module, the high-pass filtering module, the multiplying power attenuation module, the isolation amplifier, the primary filtering module, the secondary filtering module, the amplifier and the signal driver are sequentially connected;
the CPU comprises a gain control module, a frequency band selection module, a voltage measurement module, an internal and external synchronous selection module and a synchronous detection module;
the gain control module is connected with the signal processing unit and used for controlling the gain multiple of the signal processing unit;
the frequency band selection module is connected with the signal processing unit and is used for selecting the frequency band of the signal processing unit;
the voltage measuring module is connected with the voltage detecting unit and is used for monitoring test voltage signals;
the internal and external synchronization selection module is used for switching the synchronous input signals and selecting external synchronization signals or internal synchronization signals;
the synchronous detection module is connected with the synchronous pulse forming circuit unit and is used for detecting partial discharge synchronous signals generated by the synchronous pulse forming circuit unit;
the main frequency of the CPU of the embedded industrial computer is 1.6GHz or more, and the embedded industrial computer comprises an embedded integrated keyboard, a liquid crystal display screen, a mouse interface, a keyboard interface, a CRT interface, a USB interface, a printer interface and a hard disk.
2. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the A/D conversion unit adopts a chip AD8031, and the resolution is 12 bits.
3. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the CPU adopts an intel Atom D425 processor with a main frequency of 1.8GHz.
4. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the synchronous pulse forming circuit unit comprises an input isolation protection module, a band-pass filtering module, an amplitude limiting module, a zero-crossing detection module, a synchronous pulse forming module and a driver;
the input isolation protection module comprises an isolation transformer and a gas discharge tube and is used for isolating a high-voltage pulse signal on the detection loop;
the band-pass filtering module comprises an active filter and is used for removing interference signals outside the frequency range of the synchronous signals, wherein the frequency range of the synchronous signals is 50-400 Hz;
the amplitude limiting module comprises a TVS transient suppression diode and is used for absorbing high-voltage signals and ensuring that the passing signals are within the acquisition voltage range of the A/D conversion unit;
the zero-crossing detection module comprises a voltage comparator and is used for realizing zero-crossing detection and converting a sine wave signal into a square wave signal;
the synchronous pulse forming module comprises an NE555 timer and is used for shaping the square wave signal output by the zero crossing detection module to form a synchronous pulse signal;
the driver includes an operational amplifier for increasing the load carrying capacity of the output signal;
the input isolation protection module, the band-pass filtering module, the amplitude limiting module, the zero-crossing detection module, the synchronous pulse forming module and the driver are sequentially connected.
5. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the CPU comprises an RS232 interface, and is connected with the embedded industrial computer through the RS232 interface.
6. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the voltage output by the power supply unit is 220V, and the frequency is 50Hz.
7. The test platform for simulating partial discharge testing of a transformer of claim 1, wherein: the amplitude of the test voltage signal is 0-200V, and the frequency is 50-400 Hz.
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| CN109459674B (en) * | 2018-12-28 | 2020-12-22 | 国家电网有限公司 | Multi-node monitoring system synchronization device for local discharge of switch cabinet |
| CN111025099B (en) * | 2019-12-05 | 2022-03-22 | 国网宁夏电力有限公司电力科学研究院 | Simulation model and method for partial discharge detection |
| CN111736049B (en) * | 2020-08-05 | 2023-03-21 | 广东电网有限责任公司 | Generator for simulating partial discharge signal |
| CN111913027A (en) * | 2020-08-05 | 2020-11-10 | 青岛鼎信通讯股份有限公司 | Voltage detection circuit applied to high voltage and wide frequency of power electronic transformer |
| CN112485623B (en) * | 2020-12-16 | 2021-08-13 | 南方电网电力科技股份有限公司 | Multi-path accidental transient partial discharge rapid detection device |
| CN117092457A (en) * | 2023-02-02 | 2023-11-21 | 特变电工山东鲁能泰山电缆有限公司 | Filtering method and device for cable alternating-current voltage-withstanding partial discharge test external synchronous signals |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990025593A (en) * | 1997-09-13 | 1999-04-06 | 이종규 | Partial discharge on-line diagnostic system |
| CN103296903A (en) * | 2013-05-29 | 2013-09-11 | 西安建筑科技大学 | Direct-current silicon commutating power supply |
| CN103308828A (en) * | 2013-05-22 | 2013-09-18 | 广西大学 | Partial discharge electro-acoustic signals synchronous monitoring device for CPLD (complex programmable logic device)-based transformer |
| CN203950012U (en) * | 2014-05-29 | 2014-11-19 | 广州供电局有限公司 | Switch cubicle partial simulation discharging detection device |
| CN104865511A (en) * | 2015-06-23 | 2015-08-26 | 国家电网公司 | Partial discharge detection device |
| CN205982523U (en) * | 2016-08-04 | 2017-02-22 | 许继集团有限公司 | High -speed capture card suitable for GIS local discharge on -line monitoring |
| CN207281236U (en) * | 2017-09-29 | 2018-04-27 | 广西电网有限责任公司电力科学研究院 | A kind of partial discharge of transformer emulation test system |
-
2017
- 2017-09-29 CN CN201710909404.6A patent/CN107797033B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990025593A (en) * | 1997-09-13 | 1999-04-06 | 이종규 | Partial discharge on-line diagnostic system |
| CN103308828A (en) * | 2013-05-22 | 2013-09-18 | 广西大学 | Partial discharge electro-acoustic signals synchronous monitoring device for CPLD (complex programmable logic device)-based transformer |
| CN103296903A (en) * | 2013-05-29 | 2013-09-11 | 西安建筑科技大学 | Direct-current silicon commutating power supply |
| CN203950012U (en) * | 2014-05-29 | 2014-11-19 | 广州供电局有限公司 | Switch cubicle partial simulation discharging detection device |
| CN104865511A (en) * | 2015-06-23 | 2015-08-26 | 国家电网公司 | Partial discharge detection device |
| CN205982523U (en) * | 2016-08-04 | 2017-02-22 | 许继集团有限公司 | High -speed capture card suitable for GIS local discharge on -line monitoring |
| CN207281236U (en) * | 2017-09-29 | 2018-04-27 | 广西电网有限责任公司电力科学研究院 | A kind of partial discharge of transformer emulation test system |
Non-Patent Citations (1)
| Title |
|---|
| 电力变压器局部放电在线检测系统;朱德恒等;华北电力技术(第04期);全文 * |
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