CN106199478B - Examination and verification device and method for high-frequency current method partial discharge detector - Google Patents
Examination and verification device and method for high-frequency current method partial discharge detector Download PDFInfo
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Abstract
The invention discloses an examination and verification device and method of a high-frequency current method partial discharge detector 0 And an injection capacitor C 0 The device comprises a first metal testing rod, a second metal testing rod, an oscilloscope and a 50 omega coaxial cable, wherein the tested instrument comprises a partial discharge detector and a high-frequency sensor; the signal excitation source is a built-in signal source of the device and is divided into a sine wave signal source and a pulse calibration source; the matching resistor R 0 A sine wave signal source and a first metal test rod are connected in series to form a sine signal loop; the injection capacitor C0 is connected with a pulse calibration source and a second metal test rod in series to form a pulse signal loop; the invention is easy to realize, simple and quick to debug and convenient and quick in test process, can freely select an internal signal source and an external signal source for signal input, and is suitable for occasions of routine maintenance, test, check and the like of a high-frequency partial discharge detector in the power detection industry.
Description
Technical Field
The invention relates to the technical field of high-voltage detection, in particular to an examination and verification device of a high-frequency current method partial discharge detector and a design method.
Background
In high voltage detection technical field, the inside partial discharge that appears of power equipment, the pulse current of production is led to the underground through ground connection downlead, and the change that the earth connection will drive magnetic field is crossed to the electric current simultaneously, through pressing from both sides high frequency sensor on ground connection downlead, high frequency sensor inner coil converts the signal of telecommunication to on the partial discharge detecting instrument under electromagnetic induction's effect. However, the high-frequency partial discharge tester has different performances and lacks of a uniform performance verification platform, so that the effectiveness and reliability of the partial discharge detection result of the power equipment are greatly influenced, and great hidden danger is brought to the safe operation of the power equipment, and therefore, the design of the assessment verification design method of the high-frequency current method partial discharge detector has great significance.
Disclosure of Invention
The invention provides an examination and verification device of a high-frequency current method partial discharge detector and a design method aiming at the defects of the prior art.
An examination and calibration device based on a high-frequency current method partial discharge detector comprises a signal excitation source and a matching resistor R 0 And an injection capacitor C 0 The device comprises a first metal testing rod, a second metal testing rod, an oscilloscope and a 50 omega coaxial cable, wherein the tested instrument comprises a partial discharge detector and a high-frequency sensor; the signal excitation source is a built-in signal source of the device and is divided into a sine wave signal source and a pulse calibration source; the matching resistor R 0 A sine wave signal source and a first metal test rod are connected in series to form a sine signal loop; the injection capacitor C 0 The pulse calibration source and the second metal test rod are connected in series to form a pulse signal loop; the two metal test rods are used for transmitting high-frequency current signals; the high frequency sensor (HFCT) is sleeved into the metal test rod in a penetrating way, and the output end of the high frequency sensor is connected to the oscilloscope or the partial discharge detector; the high-resistance voltage probe of the oscilloscope is connected with two ends of the matching resistor, and the high-frequency sensor is connected with the partial discharge detector by adopting a 50 omega coaxial cable.
The signal excitation source is divided into a sine wave signal source and a pulse calibration source and can provide continuous sine wave signals and pulse signals with adjustable amplitude and frequency for the examination and verification device; the output amplitude of the sine wave signal waveform is adjustable from 0V to 10V, and the output frequency is adjustable from 50kHz to 120 MHz; the output amplitude of the pulse signal is 1 mV-10V adjustable, the rising edge time (10% -90%) of the pulse signal is not more than 5ns, and the decay time (90% -10%) is not less than 200ns. A control panel is arranged outside the signal excitation source, and the control panel is provided with a power supply, a switch, a wiring and interface, a display part and a key; the power supply and the switch are an internal signal excitation source power supply interface and a control switch; the wiring and the interface are used for an internal signal excitation source signal output interface and can output a sine signal, a pulse signal and a synchronous signal; the display part displays parameters such as amplitude, frequency and the like of output signals of the internal signal excitation source; the key is used for controlling signal waveform, amplitude, frequency and the like output by the internal signal excitation source.
The matching resistor R 0 The impedance of the non-inductive resistor is 50 omega +/-0.2%, the matching resistor is connected with a sine wave signal source and a metal test rod in series to form a sine signal loop, and a sine current signal is generated in the loop and is used for project tests of sensor transmission impedance, detection frequency, anti-interference performance and the like.
The injection capacitor C 0 Is a high-frequency ceramic capacitor with a capacitance of 100pF +/-2% and an injection capacitor C 0 The pulse calibration source and the metal test rod are connected in series to form a pulse signal loop, and a pulse current signal is generated in the loop and is used for item tests such as detection sensitivity, linearity, anti-interference performance, pulse counting, diagnosis and identification.
The two metal test rods are respectively applied to a sine signal loop and a pulse signal loop and used for transmitting high-frequency current signals and grounding, and the rod body is made of metal copper, so that the metal test rod has good conductivity, low resistivity and small signal attenuation.
The oscilloscope is used for acquiring voltage signals acquired by two ends of the matching resistor and the high-frequency sensor, and the signal measurement bandwidth is not less than 100MHz.
The 50 omega coaxial cable is used for connecting all loops and is used as a signal transmission lead.
The high-frequency sensor is used for collecting high-frequency current signals of the signal loop and transmitting the high-frequency current signals to the partial discharge detector through a 50 omega coaxial cable signal lead.
The invention provides an examination and verification design method of a high-frequency current method partial discharge detector based on the examination and verification device of the high-frequency current method partial discharge detector, which comprises the following specific steps:
sensor transmission impedance testing
Selecting sine wave signal source to input sine signal, connecting high-frequency sensor to oscilloscope via signal cable, and matching resistor R 0 The two ends are connected to the high-resistance voltage probe of the oscilloscope through the signal cable.
The method comprises the following steps: the sine wave signal source is adjusted to output voltage with adjustable frequency, and a sine current signal with corresponding frequency and peak value between 10mA-30mA is generated in a sine signal loop;
step two: regulating the output frequency of sine wave signal source in the range of 3 MHz-30 MHz, and measuring the output voltage V of high frequency transducer (HFCT) at different frequencies f by oscilloscope 2 (f) And a matching resistor R 0 Voltage V across 1 (f)；
Step three: according to the formula Z (f) = R 0 (V 2 (f)/V 1 (f) Calculate the transmission impedance of the sensor at that frequency.
And (4) conclusion: if the transmission impedance of the high-frequency sensor in the frequency band range of 3 MHz-30 MHz is not less than 5Mv/mA, the sensor meets the performance assessment requirement.
Test for detection frequency band
Sine wave signal source is selected to input sine signal, high frequency sensor is connected to partial discharge detector through signal cable, and matching resistor R 0 Two ends of the high-resistance voltage probe are connected to the oscilloscope high-resistance voltage probe through a signal cable.
The method comprises the following steps: adjusting the voltage with adjustable output frequency of the sine wave signal source, and generating a sine current signal with corresponding frequency and peak value between 5mA and 10mA in a test loop;
step two: the frequency of the sine wave signal is changed within the range of 0.5 MHz-50 MHz, and the matching resistance R is measured by an oscilloscope 0 The voltage at the two ends monitors the loop current, and keeps the current unchanged when adjusting the frequency;
step three: and finding out the frequency f corresponding to the maximum reading (or the maximum amplitude output by the analog signal port) displayed by the partial discharge detector (comprising the HFCT).
And (4) conclusion: if the frequency f is within the frequency range of 3 MHz-30 MHz and the 6dB bandwidth is not less than 2MHz, the instrument meets the performance assessment requirement.
Sensitivity testing
The pulse calibration source is selected to input a pulse signal, and the high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: regulating pulse calibration source U p Output pulse voltage through injection capacitor C 0 Generating a pulse current in a test loop simulating an apparent charge Q (U) p ×C 0 ) The partial discharge signal of (1);
step two: the pulse current of the test loop is detected by a partial discharge detector (including HFCT), and the signal-to-noise ratio of the signal detected by the partial discharge detector is found when Q is 50 pC.
And (4) conclusion: if the signal-to-noise ratio of the partial discharge detector is not lower than 2, the partial discharge detector meets the performance assessment requirement, and the higher the signal-to-noise ratio is, the higher the detection sensitivity of the partial discharge detector is.
Linearity error test
The pulse calibration source is selected to input a pulse signal, and the high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: regulating a pulsed calibration source U p Output voltage amplitude, resulting in an apparent charge Q of about 50pC 1 Recording the amplitude V of the measurement signal displayed by the partial discharge detector (including HFCT) 1 ；
Step two: regulating a pulsed calibration source U p Output voltage amplitude, resulting in an apparent charge Q of about 5000pC 2 Recording the amplitude V of the measurement signal displayed by the partial discharge detector (including HFCT) 2 ；
Step three, such asThe signal amplitude displayed by the fruit partial discharge detector is a linear scale value, and the linearity error formula is epsilon = abs (1- (V) 2 /V 1 )/(Q 2 /Q 1 ) X 100); if the signal amplitude displayed by the partial discharge detector is logarithmic scale value, the linearity error formula is
abs denotes the absolute value.
And (4) conclusion: if the dynamic range of the partial discharge signal is 40dB, the detection linearity error is not more than 15%, and the instrument meets the performance assessment requirement.
Stability test
And selecting a pulse calibration source input signal, and connecting the high-frequency sensor to the partial discharge detector through a signal cable.
The method comprises the following steps: adjusting a pulse calibration source to output a pulse signal with a constant amplitude, and recording a detection signal amplitude a of the partial discharge detector when the partial discharge detector is just started;
step two: continuously working the partial discharge detector for 1 hour, and recording a detection signal amplitude b of the partial discharge detector at the moment;
step three: and calculating the stability error according to the recorded value and a formula (| b-a |/a) × 100%.
And (4) conclusion: if the detected peak value change detected by the partial discharge detector is not more than plus or minus 10 percent, the device accords with the requirement of instrument assessment performance.
6. Interference resistance test
Sine wave signals are input by a sine signal source, pulse signals are input by a pulse calibration source, and a high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: calibration of source U by pulse p And an injection capacitor C 0 Generating a high-frequency pulse current with apparent charge Q in a test loop, and using a sine wave signal source U s Via a resistance R 0 (50 Ω) generating interference currents of different frequencies, simultaneously applied to the input of a sensor under test (HFCT);
step two: under the condition of any given frequency interference current, when the measured charge quantity Q is 50pC and the peak value of the interference current is 25mA, observing a detection signal displayed by the partial discharge detector;
step three: changing the frequency of the sine wave signal source to 50kHz, 500kHz, 1MHz, 2MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHz, 35MHz and 40MHz, and repeating the steps.
And (4) conclusion: if the partial discharge detector can detect signals with frequencies not lower than 2:1, the instrument has good anti-interference performance.
Benefits of the invention
The invention is easy to realize, simple and quick to debug, convenient and quick to test the process, the test item includes: the sensor is suitable for routine maintenance, testing, checking and other occasions of high-frequency partial discharge detectors in the power detection industry.
Drawings
FIG. 1 is a schematic diagram of a high-frequency current method partial discharge detector calibration device;
FIG. 2 is a wiring diagram for a transmission impedance test of a sensor;
FIG. 3 is a wiring diagram for testing frequency;
FIG. 4 is a wiring diagram for sensitivity, linearity test and stability test;
fig. 5 is a wiring diagram for the anti-interference performance test.
Detailed Description
As shown in figure 1, the examination and verification device based on the high-frequency current method partial discharge detector comprises a signal excitation source and a matching resistor R 0 3. Injection capacitance C 0 4. The device comprises a first metal test rod, a second metal test rod, an oscilloscope 7 and a 50 omega coaxial cable 9, wherein the measured instrument comprises a partial discharge detector 6 and a high-frequency sensor 5; the signal excitation source is a built-in signal source of the device and is divided into a sine wave signal source 1 and a pulse calibration source 2; the matching resistor R 0 A sine wave signal source and a first metal test rod are connected in series to form a sine signal loop; the injection capacitor C 0 Are connected in seriesThe pulse calibration source and the second metal test rod are combined to form a pulse signal loop; the two metal test rods are used for transmitting high-frequency current signals; the high frequency sensor (HFCT) is sleeved into the metal test rod in a penetrating way, and the output end of the high frequency sensor is connected to the oscilloscope or the partial discharge detector; the oscilloscope high-resistance voltage probe is connected with two ends of the matching resistor.
The signal excitation source is divided into a sine wave signal source 1 and a pulse calibration source 2, and can provide continuous sine wave signals and pulse signals with adjustable amplitude and frequency for the examination and verification device; the sine wave signal waveform output amplitude is adjustable from 0V to 10V, and the output frequency is adjustable from 50kHz to 120 MHz; the output amplitude of the pulse signal is 1 mV-10V and is adjustable, the rising edge time (10% -90%) of the pulse signal is not more than 5ns, and the decay time (90% -10%) is not less than 200ns. A control panel is arranged outside the signal excitation source and is provided with a power supply, a switch, a wiring and interface, a display part and a key; the power supply and the switch are an internal signal excitation source power supply interface and a control switch; the wiring and the interface are used for an internal signal excitation source signal output interface and can output a sine signal, a pulse signal and a synchronous signal; the display part displays parameters such as amplitude, frequency and the like of output signals of the internal signal excitation source; the key is used for controlling signal waveform, amplitude, frequency and the like output by the internal signal excitation source.
The matching resistor R 0 The impedance of the non-inductive resistor is 50 omega +/-0.2%, the matching resistor is connected with a sine wave signal source and a metal test rod in series to form a sine signal loop, and a sine current signal is generated in the loop and is used for project tests of sensor transmission impedance, detection frequency, anti-interference performance and the like.
The injection capacitor C 0 Is a high-frequency ceramic capacitor with a capacitance of 100pF +/-2% and an injection capacitor C 0 The pulse calibration source and the metal test rod are connected in series to form a pulse signal loop, and a pulse current signal is generated in the loop and is used for item tests such as detection sensitivity, linearity, anti-interference performance, pulse counting, diagnosis and identification.
The two metal test rods are respectively applied to the sine signal loop and the pulse signal loop and used for transmitting high-frequency current signals and grounding, and the rod body is made of metal copper, so that the metal test rod has good conductivity, low resistivity and small signal attenuation.
The oscilloscope is used for collecting voltage signals collected by two ends of the matching resistor and the high-frequency sensor, and the signal measurement bandwidth is not lower than 100MHz.
The 50 omega coaxial cable is used for connecting all loops and is used as a signal transmission lead.
The high-frequency sensor is used for collecting high-frequency current signals of the signal loop and transmitting the high-frequency current signals to the partial discharge detector through a 50 omega coaxial cable signal lead.
The invention provides an examination and verification design method of a high-frequency current method partial discharge detector based on the examination and verification device of the high-frequency current method partial discharge detector, which comprises the following specific steps:
as shown in FIG. 2, the sensor transfer impedance test
Selecting sine wave signal source 1 to input sine signal, connecting high frequency sensor to oscilloscope via signal cable, and matching resistor R 0 The two ends are connected to the oscilloscope high resistance voltage probe through the signal cable.
The method comprises the following steps: the sine wave signal source is adjusted to output voltage with adjustable frequency, and a sine current signal with corresponding frequency and peak value between 10mA-30mA is generated in a sine signal loop;
step two: regulating the output frequency of sine wave signal source in the range of 3 MHz-30 MHz, and measuring the output voltage V of high frequency transducer (HFCT) at different frequencies f by oscilloscope 2 (f) And a matching resistance R 0 Voltage V across 1 (f)；
Step three: according to the formula Z (f) = R 0 (V 2 (f)/V 1 (f) Calculate the transmission impedance of the sensor at that frequency.
And (4) conclusion: if the transmission impedance of the high-frequency sensor in the frequency band range of 3 MHz-30 MHz is not less than 5Mv/mA, the sensor meets the performance assessment requirement.
As shown in fig. 3, the detection band test
Sine wave signal source is selected to input sine signal, high frequency sensor is connected to partial discharge detector through signal cable, and matching resistor R 0 Two ends of the high-resistance voltage probe are connected to the oscilloscope high-resistance voltage probe through a signal cable.
The method comprises the following steps: adjusting the voltage with adjustable output frequency of the sine wave signal source, and generating a sine current signal with corresponding frequency and peak value between 5mA and 10mA in a test loop;
step two: the frequency of the sine wave signal is changed within the range of 0.5 MHz-50 MHz, and the matching resistance R is measured by an oscilloscope 0 The voltage at the two ends monitors the loop current, and keeps the current unchanged when adjusting the frequency;
step three: and finding out the frequency f corresponding to the maximum reading (or the maximum amplitude output by the analog signal port) displayed by the partial discharge detector (comprising the HFCT).
And (4) conclusion: if the frequency f is within the frequency range of 3 MHz-30 MHz and the 6dB bandwidth is not less than 2MHz, the instrument meets the performance assessment requirement.
As shown in FIG. 4, the sensitivity test
The pulse calibration source is selected to input a pulse signal, and the high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: regulating pulse calibration source U p Output pulse voltage through injection capacitor C 0 Generating a pulsed current in a test loop simulating an apparent charge Q (U) p ×C 0 ) The partial discharge signal of (1);
step two: the pulse current of the test loop is detected by a partial discharge detector (including HFCT), and the signal-to-noise ratio of the signal detected by the partial discharge detector is found when Q is 50 pC.
And (4) conclusion: if the signal-to-noise ratio of the partial discharge detector is not lower than 2, the partial discharge detector meets the performance assessment requirement, and the higher the signal-to-noise ratio is, the higher the detection sensitivity of the partial discharge detector is.
Linearity error test
The pulse calibration source is selected to input a pulse signal, and the high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: regulating a pulsed calibration source U p Output voltageAmplitude, resulting in an apparent charge Q of about 50pC 1 Recording the amplitude V of the measurement signal displayed by the partial discharge detector (including HFCT) 1 ；
Step two: regulating a pulsed calibration source U p Output voltage amplitude to produce an apparent charge Q of about 5000pC 2 Recording the amplitude V of the measurement signal displayed by the partial discharge detector (including HFCT) 2 ；
If the signal amplitude displayed by the partial discharge detector is a linear scale value, the linearity error formula is epsilon = abs (1- (V) 2 /V 1 )/(Q 2 /Q 1 ) X 100); if the signal amplitude displayed by the partial discharge detector is logarithmic scale value, the linearity error formula is
abs represents the absolute value;
and (4) conclusion: if the dynamic range of the partial discharge signal is 40dB, the detection linearity error is not more than 15%, and the instrument meets the performance assessment requirement.
Stability test
And selecting a pulse calibration source input signal, and connecting the high-frequency sensor to the partial discharge detector through a signal cable.
The method comprises the following steps: adjusting a pulse calibration source to output a pulse signal with a constant amplitude, and recording a detection signal amplitude a of the partial discharge detector when the partial discharge detector is just started;
step two: continuously working the partial discharge detector for 1 hour, and recording a detection signal amplitude b of the partial discharge detector at the moment;
step three: and calculating the stability error according to the recorded value and a formula (| b-a |/a) × 100%.
And (4) conclusion: if the detected peak value change detected by the partial discharge detector does not exceed plus or minus 10%, the instrument checking performance requirement is met.
As shown in FIG. 5, the interference resistance test
Sine wave signals are input by a sine signal source, pulse signals are input by a pulse calibration source, and a high-frequency sensor is connected to the partial discharge detector through a signal cable.
The method comprises the following steps: calibration of source U by pulses p And an injection capacitor C 0 Generating a high-frequency pulse current with apparent charge Q in a test loop, and using a sine wave signal source U s Via a resistance R 0 (50 Ω) generating interference currents of different frequencies, simultaneously applied to the input of a sensor under test (HFCT);
step two: under the condition of interference current with any given frequency, when the measured electric charge quantity Q is 50pC and the peak value of the interference current is 25mA, observing a detection signal displayed by the partial discharge detector;
step three: changing the frequency of the sine wave signal source to 50kHz, 500kHz, 1MHz, 2MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHz, 35MHz and 40MHz, and repeating the steps.
And (4) conclusion: if the partial discharge detector can detect signals with frequencies not lower than 2:1, the anti-interference performance of the instrument is good.
Claims (9)
1. The utility model provides an examination verifying attachment based on high frequency current method partial discharge detector which characterized in that: the device comprises a signal excitation source and a matching resistor R 0 And an injection capacitor C 0 The device comprises a first metal testing rod, a second metal testing rod, an oscilloscope and a 50 omega coaxial cable; the measured instrument comprises a partial discharge detector and a high-frequency sensor; the signal excitation source is a built-in signal source of the device and is divided into a sine wave signal source and a pulse calibration source; the matching resistor R 0 A sine wave signal source and a first metal test rod are connected in series to form a sine signal loop; the injection capacitor C 0 The pulse calibration source and the second metal test rod are connected in series to form a pulse signal loop; the two metal test rods are used for transmitting high-frequency current signals; the high-frequency sensor is sleeved into the first metal testing rod and the second metal testing rod in a penetrating manner, and the output end of the high-frequency sensor is connected to an oscilloscope or a partial discharge detector; the high-resistance voltage probe of the oscilloscope is connected with two ends of the matching resistor, and the high-frequency sensor is connected with the partial discharge detector by adopting a 50 omega coaxial cable.
2. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the signal excitation source is divided into a sine wave signal source and a pulse calibration source and provides continuous sine wave signals and pulse signals with adjustable amplitude and frequency for the examination and verification device; the output amplitude of the sine wave signal waveform is 0-10V and is adjustable, and the output frequency is 50 kHz-120 MHz and is adjustable; the output amplitude of the pulse signal is 1 mV-10V and is adjustable, the rising edge time of the pulse signal is not more than 5ns, the rising edge time of the pulse signal starts from 10% of the amplitude of the pulse signal and ends when the rising edge time reaches 90%, the attenuation time is not less than 200ns, and the attenuation time starts from 90% of the amplitude of the pulse signal and ends when the rising edge time reaches 10%.
3. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: a control panel is arranged outside the signal excitation source and is provided with a power supply, a switch, a wiring and interface, a display part and a key; the power supply and the switch are an internal signal excitation source power supply interface and a control switch; the wiring and the interface are used for an internal signal excitation source signal output interface and can output a sine signal, a pulse signal and a synchronous signal; the display part displays the amplitude and the frequency of an output signal of the internal signal excitation source; the key is used for controlling the waveform, amplitude and frequency of the signal output by the internal signal excitation source.
4. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the matching resistor R 0 The resistance value of the non-inductive resistor is 50 omega +/-0.2 percent.
5. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the injection capacitor C 0 The capacitor is a high-frequency ceramic capacitor, and the size of the capacitor is 100pF +/-2%.
6. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the rod bodies of the first and second metal test rods are made of metal copper.
7. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the oscilloscope is used for displaying voltage signals at two ends of the matching resistor and voltage signals collected by the high-frequency sensor, and the signal measurement bandwidth is not lower than 100MHz.
8. The examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the high-frequency sensor is used for collecting high-frequency current signals of a signal loop and transmitting the high-frequency current signals to the partial discharge detector through a 50 omega coaxial cable signal lead.
9. The design method of the examination and verification device based on the high-frequency current method partial discharge detector is characterized in that: the method specifically comprises the following steps:
(1) sensor transmission impedance testing
Sleeving a high-frequency sensor into the first metal test rod, selecting a sine wave signal source to input a sine signal, connecting the high-frequency sensor to an oscilloscope through a signal cable, and matching a resistor R 0 Two ends of the high-resistance voltage probe are connected to the oscilloscope high-resistance voltage probe through a signal cable;
the method comprises the following steps: the method comprises the steps of adjusting the output voltage with adjustable frequency of a sine wave signal source, and generating a sine current signal with corresponding frequency and peak value between 10mA and 30mA in a sine signal loop;
step two: regulating the output frequency of the sine wave signal source within the range of 3 MHz-30 MHz, and simultaneously measuring the output voltage V of the high-frequency sensor under different frequencies f by using an oscilloscope 2 (f) And a matching resistance R 0 Voltage V across 1 (f)；
Step three: according to the formula Z (f) = R 0 (V 2 (f)/V 1 (f) Calculate the transmission impedance of the sensor at different frequencies;
and (4) conclusion: if the transmission impedance of the high-frequency sensor in the frequency band range of 3 MHz-30 MHz is not less than 5Mv/mA, the high-frequency sensor meets the performance assessment requirement;
(2) detection band testing
Sleeving a high-frequency sensor into the first metal test rod, selecting a sine wave signal source to input a sine signal, connecting the high-frequency sensor to a partial discharge detector through a signal cable, and matching a resistor R 0 Two ends of the high-resistance voltage probe are connected to the oscilloscope high-resistance voltage probe through a signal cable;
the method comprises the following steps: adjusting the voltage with adjustable output frequency of the sine wave signal source, and generating a sine current signal with corresponding frequency and peak value between 5mA and 10mA in a test loop;
step two: the frequency of the sine wave signal is changed within the range of 0.5 MHz-50 MHz, and the matching resistance R is measured by an oscilloscope 0 Voltage at two ends, monitoring loop current, and keeping the current unchanged when adjusting frequency;
step three: finding out the maximum reading displayed by the partial discharge detector or the frequency f corresponding to the maximum amplitude output by the analog signal port;
and (4) conclusion: if the frequency f is within the frequency range of 3 MHz-30 MHz and the 6dB bandwidth is not less than 2MHz, the partial discharge detector meets the performance examination requirement;
(3) sensitivity test
Sleeving a high-frequency sensor into a second metal test rod, selecting a pulse calibration source to input a pulse signal, and connecting the high-frequency sensor to a partial discharge detector through a signal cable;
the method comprises the following steps: regulating a pulsed calibration source U p Output pulse voltage through injection capacitor C 0 Generating a pulse current in a test loop simulating an apparent charge Q (U) p ×C 0 ) The partial discharge signal of (1);
step two: detecting the pulse current of the test loop by using a partial discharge detector, and finding out the signal-to-noise ratio of a signal detected by the partial discharge detector when Q is 50 pC;
and (4) conclusion: if the signal-to-noise ratio of the partial discharge detector is not lower than 2, the partial discharge detector meets the performance assessment requirement, and the higher the signal-to-noise ratio is, the higher the detection sensitivity of the partial discharge detector is;
(4) linearity error test
Sleeving a high-frequency sensor into a second metal test rod, selecting a pulse calibration source to input a pulse signal, and connecting the high-frequency sensor to a partial discharge detector through a signal cable;
the method comprises the following steps: regulating pulse calibration source U p Output voltage amplitude, resulting in an apparent charge Q of about 50pC 1 Recording the amplitude V of the measurement signal displayed by the partial discharge detector 1 ；
Step two: regulating pulse calibration source U p Output voltage amplitude, resulting in an apparent charge Q of about 5000pC 2 Recording the amplitude V of the measurement signal displayed by the partial discharge detector 2 ；
If the signal amplitude displayed by the partial discharge detector is a linear scale value, the linearity error formula is epsilon = abs (1- (V) 2 /V 1 )/(Q 2 /Q 1 ) X 100); if the signal amplitude displayed by the partial discharge detector is logarithmic scale value, the linearity error formula is
abs represents the absolute value;
and (4) conclusion: if the dynamic range of the partial discharge signal is 40dB, the detection linearity error is not more than 15%, and the partial discharge detector meets the performance assessment requirement;
(5) stability test
Sleeving a high-frequency sensor into a second metal test rod, selecting a pulse calibration source to input a signal, and connecting the high-frequency sensor to a partial discharge detector through a signal cable;
the method comprises the following steps: adjusting a pulse calibration source to output a pulse signal with a constant amplitude, and recording a detection signal amplitude a of the partial discharge detector when the partial discharge detector is just started;
step two: continuously working the partial discharge detector for 1 hour, and recording a detection signal amplitude b of the partial discharge detector at the moment;
step three: calculating the stability error according to the recorded value and a formula (| b-a |/a) × 100%;
and (4) conclusion: if the detected peak value change detected by the partial discharge detector does not exceed plus or minus 10%, the check performance requirement of the partial discharge detector is met;
(6) interference resistance test
Sleeving a high-frequency sensor into the first metal testing rod and the second metal testing rod, inputting a sine wave signal by a sine wave signal source, inputting a pulse signal by a pulse calibration source, and connecting the high-frequency sensor to a partial discharge detector through a signal cable;
the method comprises the following steps: calibration of source U by pulses p And an injection capacitor C 0 Generating a high-frequency pulse current with apparent charge Q in a test loop, and using a sine wave signal source U s Matched resistance R 0 Generating interference currents of different frequencies, simultaneously applying them to the input of the sensor under test, matching the resistance R 0 Is 50 omega;
step two: under the condition of interference current with any given frequency, when the measured electric charge quantity Q is 50pC and the peak value of the interference current is 25mA, observing a detection signal displayed by the partial discharge detector;
step three: changing the frequency of the sine wave signal source to 50kHz, 500kHz, 1MHz, 2MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHz, 35MHz and 40MHz, and repeating the steps;
and (4) conclusion: if the partial discharge detector can detect signals with the frequency not lower than 2:1, the partial discharge detector has good anti-interference performance.
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| CN106772178A (en) * | 2016-12-12 | 2017-05-31 | 国网北京市电力公司 | The calibration equipment of high frequency electric live testing apparatus for local discharge, method and device |
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