CN213986665U - Quantifiable direct current support capacitor self-healing performance test system - Google Patents
Quantifiable direct current support capacitor self-healing performance test system Download PDFInfo
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- CN213986665U CN213986665U CN202022879271.2U CN202022879271U CN213986665U CN 213986665 U CN213986665 U CN 213986665U CN 202022879271 U CN202022879271 U CN 202022879271U CN 213986665 U CN213986665 U CN 213986665U
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Abstract
The utility model discloses a can quantify DC and support condenser self-healing capability test system, its charging resistor R0One end of the voltage stabilizing capacitor C is connected with one pole of the direct current power supplypOne end of the charging resistor R is connected with0Another terminal of (1), a voltage stabilizing capacitor CpThe other end of the resistor is connected with the other pole of the direct current power supply and a current-limiting resistor RxOne end of the charging resistor R is connected with0The other end of (1), a current limiting resistor RxThe other end of the test piece is connected with a test piece capacitance element CsOne end of (1), a sample capacitance element CsThe other end of the sampling resistor is connected with a sampling resistor RcOne end of (1), a sampling resistor RcThe other end of the sampling resistor R is connected with the other pole of the direct current power supplycThe other end of the voltage recorder is grounded, and one end of the voltage recorder is connected with a sampling resistor RcOne end of the voltage recorder and the other end of the voltage recorder are connected with a sampling resistor RcAnd the other end of the same. The utility model discloses can realize accurate direct current and support condenser self-healing capability test.
Description
Technical Field
The utility model relates to an electric power system electric power equipment technical field specifically indicates a quantifiable direct current supports condenser self-healing capability test system.
Background
At present, in high-voltage and high-power current converters such as flexible direct-current transmission engineering and the like, a direct-current supporting capacitor adopts a metallized film capacitor, and the converter has the performance characteristics of high voltage resistance, high current resistance, low inductance, low loss, good temperature performance, safety, explosion prevention, good stability and the like, and has high technical requirements, so that the medium-high end market of the domestic products mainly depends on import at present, and the demand is increased year by year, because the reliability and the safety requirements of the direct-current supporting capacitor for the flexible direct-current transmission engineering are high, the service life and the reliability of the domestic direct-current supporting capacitor cannot meet the long-time operation requirements, the self-healing capability of the capacitor under the overvoltage condition through a self-healing performance test is very necessary, and the description of the current checkup phenomenon test method comprises the following steps: the sound method (a silent chamber type and a water immersion type), the ultrasonic detection method, the oscilloscope detection method, the infrared imaging method and the chromatographic analysis method cannot quantitatively measure the self-healing performance, and further cannot realize the online sorting and checking of the quality of the self-healing performance.
Disclosure of Invention
The utility model aims at providing a can quantify the direct current and support condenser self-healing capability test system, the utility model discloses can realize accurate direct current and support condenser self-healing capability test.
To achieve the object, the utility model relates to a can quantify DC and support condenser self-healing capability test system, it includes charging resistor R0Voltage stabilizing capacitor CpAnd a test sample capacitance element CsCurrent limiting resistor RxSampling resistor RcAnd a voltage recorder, wherein the charging resistor R0One end of the voltage stabilizing capacitor C is connected with one pole of the direct current power supplypOne end of the charging resistor R is connected with0Another terminal of (1), a voltage stabilizing capacitor CpThe other end of the resistor is connected with the other pole of the direct current power supply and a current-limiting resistor RxOne end of the charging resistor R is connected with0The other end of (1), a current limiting resistor RxThe other end of the test piece is connected with a test piece capacitance element CsOne end of (1), a sample capacitance element CsThe other end of the sampling resistor is connected with a sampling resistor RcOne end of (1), a sampling resistor RcThe other end of the sampling resistor R is connected with the other pole of the direct current power supplycThe other end of the voltage recorder is grounded, and one terminal of the voltage recorder is connected with a sampling resistor RcOne end of the voltage recorder, the other terminal of the voltage recorder is connected with a sampling resistor RcAnd the other end of the same.
The prior art only adopts means such as sound wave record to record the self-healing number of times of unit time, checks whether it exceeds the standard requirement, and the check surface is comparatively single, is limited by the test principle and the self-healing number of times that its record and condenser actually take place the self-healing number often come in and go out very greatly, the utility model discloses a resistance terminal voltage change of connecting in series with the measured capacitor is tested in the indirect test, from the self-healing energy size; self-healing starting voltage; the self-healing times in unit time; the three dimensions are used for comprehensive quantitative assessment of the self-healing performance, and the assessment result can reflect the comprehensive self-healing capability and reliability of the capacitor.
Drawings
FIG. 1 is a current diagram of the present invention;
fig. 2 is the waveform diagram of the self-healing voltage and current in the present invention.
In FIG. 2, U1For sampling the voltage across the resistor before self-healing, U2The voltage t at two ends of the self-healing sampling resistorshFor the duration of the self-healing to take place, udIs a self-healing voltage.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1 and 2, the system for testing the self-healing performance of the quantifiable dc-supported capacitor includes a charging resistor R0Voltage stabilizing capacitor CpAnd a test sample capacitance element CsCurrent limiting resistor RxSampling resistor RcAnd a voltage recorder, wherein the charging resistor R0One end of the voltage stabilizing capacitor C is connected with one pole of the direct current power supplypOne end of the charging resistor R is connected with0Another terminal of (1), a voltage stabilizing capacitor CpThe other end of the resistor is connected with the other pole of the direct current power supply and a current-limiting resistor RxOne end of the charging resistor R is connected with0The other end of (1), a current limiting resistor RxThe other end of the test piece is connected with a test piece capacitance element CsOne end of (1), a sample capacitance element CsThe other end of the sampling resistor is connected with a sampling resistor RcOne end of (1), a sampling resistor RcThe other end of the sampling resistor R is connected with the other pole of the direct current power supplycThe other end of the voltage recorder is grounded, and one terminal of the voltage recorder is connected with a sampling resistor RcOne end of the voltage recorder, the other terminal of the voltage recorder is connected with a sampling resistor RcAnd the other end of the same.
In the above technical scheme, Cp>>10Cs，R0Cp>>RxCsTherefore, in the self-healing process, the voltage-stabilizing capacitor C is connected in parallelpThe voltage on the capacitor remains unchanged. The energy consumed by the self-healing process will result in CsA significant change in the upper voltage.
The technical proposal is thatThe voltage recorder is used for comparing with a sample capacitive element CsSeries sampling resistor RcCollecting voltage signal, and testing the self-healing performance of the capacitor by DC power supplysTest voltage is applied to two ends, and a voltage recorder records a sampling resistor RcThe rate of change of voltage at each sampling time at both ends with time, as the sampling resistor RcWhen the time-varying rate of the voltages at the two ends is equal to the preset time-varying rate threshold value of the voltage, the capacitance element C represents a test samplesSelf-healing occurs. Sampling resistor RcThe time-varying rate of the voltage at both ends is calculated by
Wherein u represents the sampling resistance RcThe real-time voltage across, t represents the sampling time.
According to the technical scheme, a preset threshold value of the voltage change rate along with time, namely the slope of a voltage change curve, can be set according to experience, the number of self-healing points counted under the set threshold value is compared with the number of actually released self-healing points for correction, if the number of the counted self-healing points is less than that of the actually released self-healing points, the sensitivity is insufficient, the threshold value is properly reduced, and otherwise, the threshold value is increased.
In the above technical scheme, the voltage recorder is used for recording the capacitance element C of the test samplesSampling resistor R at sampling moment before self-healing occurscVoltage U across1And a sample capacitor element CsSampling resistor R at sampling moment after self-healingcVoltage U across2Calculating sample capacitance element CsEnergy W generated during self-healingsh。
In the above technical scheme, the test article capacitance element CsEnergy W generated during self-healingshThe calculation is made according to the following formula:
c in the formulasPresentation testThe capacitance value of the product capacitor element.
In the above technical scheme, the dc power supply supplies a test article capacitance element CsCapacitive element C with test voltage applied at two ends as samples1.5 times the rated voltage.
In the technical scheme, the counter arranged in the voltage recorder is used for recording the sampling resistor RcThe frequency that the time change rate of the voltage at the two ends is equal to the preset threshold value of the time change rate of the voltage at the two ends is recorded to record the capacitance element C of the test samplesThe number of self-healing times.
In the above technical solution, the charging resistor R0And a voltage-stabilizing capacitor CpA filtering module is formed. The filtering module is used for realizing low-pass filtering and stabilizing constant output voltage, filtering out clutter with high frequency and ensuring that an input signal has no influence of the clutter.
In the technical scheme, the voltage recorder is a high-speed voltage recorder, the measuring range is +/-10 Vdc, the recording speed is 100KS/s, and the highest precision is 1 mV.
In the above technical scheme, the current limiting resistor RxCapacitive element C for preventing test samplesSample capacitor element C caused by overlarge current during self-healingsSelf-healing failure, sampling resistance RcIs a non-inductive resistor, and is used for measuring a sample capacitance element CsSelf-healing voltage changes.
A capacitor self-healing performance testing method using the system comprises the following steps:
step 1: capacitor element C for sample supplied by DC power supplysTest voltage is applied to two ends, and a voltage recorder records a sampling resistor RcThe rate of change of voltage at each sampling time at both ends with time, as the sampling resistor RcWhen the time-varying rate of the voltages at the two ends is equal to the preset time-varying rate threshold value of the voltage, the capacitance element C represents a test samplesSelf-healing occurs;
step 2: sample capacitor element C recorded by voltage recordersSampling resistor R at sampling moment before self-healing occurscVoltage U across1And a sample capacitor element CsSampling at the next sampling time after self-healingResistance RcVoltage U across2Calculating sample capacitance element CsEnergy W generated during self-healingsh；
And step 3: each tested capacitor is connected into the test system for self-healing test, and the quantifiable direct current support capacitor self-healing performance test system respectively records the self-healing energy and the self-healing initial voltage of each tested capacitor (namely the sampling resistor R when the tested capacitor self-heals)cVoltage at two ends), self-healing times in unit time, a set self-healing energy threshold value, a self-healing initial voltage threshold value and a self-healing time threshold value are compared, and if any one exceeds the corresponding threshold value, the measured capacitor is judged to be unqualified.
In the step 1, the direct current power supply starts to apply the direct current voltage at the speed of 200V/s, and the voltage is maintained for 10 seconds after rising to the specified test voltage. The 10-second time can fully ensure that most self-healing can effectively occur under the specified test voltage, and the slow increase at a certain speed is to ensure that the voltage value at which the self-healing occurs at the beginning is recorded.
Among the above-mentioned technical scheme, after the test of first time, need disassemble to be surveyed the capacitor and check whether the number of the self-healing points of actual self-healing point and system record is unanimous, if the number of the self-healing points of actual self-healing point is greater than the number of the self-healing points of system record then suitably reduce the trigger threshold value of voltage change slope, if the number of the self-healing points of actual self-healing point is less than the number of the self-healing points of system record then suitably improve the trigger threshold value of voltage change slope, then repeat step one and two again until the test is unanimous.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (8)
1. The utility model provides a can quantify DC support capacitor self-healing performance test system which characterized in that: it includes a charging resistor R0Voltage stabilizing capacitor CpAnd a test sample capacitance element CsCurrent limiting resistor RxSampling resistor RcAnd a voltage recorder, wherein the charging resistor R0One end of the voltage stabilizing capacitor C is connected with one pole of the direct current power supplypOne end of the charging resistor R is connected with0Another terminal of (1), a voltage stabilizing capacitor CpThe other end of the resistor is connected with the other pole of the direct current power supply and a current-limiting resistor RxOne end of the charging resistor R is connected with0The other end of (1), a current limiting resistor RxThe other end of the test piece is connected with a test piece capacitance element CsOne end of (1), a sample capacitance element CsThe other end of the sampling resistor is connected with a sampling resistor RcOne end of (1), a sampling resistor RcThe other end of the sampling resistor R is connected with the other pole of the direct current power supplycThe other end of the voltage recorder is grounded, and one terminal of the voltage recorder is connected with a sampling resistor RcOne end of the voltage recorder, the other terminal of the voltage recorder is connected with a sampling resistor RcAnd the other end of the same.
2. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 1, further comprising: the voltage recorder is used for comparing with a test article capacitance element CsSeries sampling resistor RcCollecting voltage signal, and testing the self-healing performance of the capacitor by DC power supplysTest voltage is applied to two ends, and a voltage recorder records a sampling resistor RcThe rate of change of voltage at each sampling time at both ends with time, as the sampling resistor RcWhen the time-varying rate of the voltages at the two ends is equal to the preset time-varying rate threshold value of the voltage, the capacitance element C represents a test samplesSelf-healing occurs.
3. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 2, further comprising: sample capacitor element C recorded by voltage recordersSampling resistor R at sampling moment before self-healing occurscVoltage U across1And a sample capacitor element CsSampling resistor R at sampling moment after self-healingcVoltage U across2Calculating sample capacitance element CsEnergy W generated during self-healingsh。
4. A quantifiable dc supporting capacitor self-healing according to claim 3The performance test system is characterized in that: test capacitor element CsEnergy W generated during self-healingshThe calculation is made according to the following formula:
c in the formulasThe capacitance value of the sample capacitive element is indicated.
5. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 2, further comprising: the DC power supply supplies a test article capacitance element CsCapacitive element C with test voltage applied at two ends as samples1.5 times the rated voltage.
6. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 2, further comprising: a counter built in the voltage recorder by recording a sampling resistor RcThe frequency that the time change rate of the voltage at the two ends is equal to the preset threshold value of the time change rate of the voltage at the two ends is recorded to record the capacitance element C of the test samplesThe number of self-healing times.
7. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 1, further comprising: the charging resistor R0And a voltage-stabilizing capacitor CpA filtering module is formed.
8. A quantifiable dc-supported capacitor self-healing performance testing system according to claim 1, further comprising: the current limiting resistor RxCapacitive element C for preventing test samplesSample capacitor element C caused by overlarge current during self-healingsSelf-healing failure, sampling resistance RcIs a non-inductive resistor, and is used for measuring a sample capacitance element CsSelf-healing voltage changes.
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