CN113960434B - Gate valve abrupt slope front surge voltage test circuit and test method thereof - Google Patents
Gate valve abrupt slope front surge voltage test circuit and test method thereof Download PDFInfo
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- CN113960434B CN113960434B CN202111128701.XA CN202111128701A CN113960434B CN 113960434 B CN113960434 B CN 113960434B CN 202111128701 A CN202111128701 A CN 202111128701A CN 113960434 B CN113960434 B CN 113960434B
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000010998 test method Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 44
- 238000013016 damping Methods 0.000 claims description 27
- 238000004146 energy storage Methods 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000009863 impact test Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention provides a circuit and a method for testing surge voltage before abrupt slope of a thyristor valve. The invention simply and conveniently completes the steep wave front surge voltage test of the thyristor valve, generates the steep wave front surge voltage with controllable wave front time and half peak time for the thyristor valve, and compared with the traditional method of reducing the wave head resistance of the surge voltage generator and the direct wave cutting method, the invention ensures that the steep wave front surge voltage test of the thyristor valve is safer and easier, greatly reduces the test risk and difficulty and greatly improves the test efficiency.
Description
Technical Field
The invention relates to a thyristor valve steep front surge voltage test circuit and a test method thereof, belonging to the technical field of high voltage tests.
Background
The thyristor valve is a key device in the high-voltage direct-current transmission engineering, and can bear high voltage for a long time to pass through large current in the operation process, so that a large amount of heat is generated, and the junction temperature of the thyristor is increased. In addition, when the AC inlet line of the thyristor valve is in ground fault, transient impulse voltage with very high steepness is generated, and great test is caused on the insulation of the thyristor valve. Thus, according to IEC 60700-1-2015 and GB/T20990.1-2020, part 1: the electrical test standard requires that the surge voltage tolerance capability of the thyristor valve before the gradient under the highest junction temperature condition needs to be verified in the thyristor type test stage, and the gradient is generally required to be not less than 1200 kV/mu s. Because the thyristor valve is internally provided with capacitive loads such as damping capacitance, the equivalent capacitance is larger, the surge voltage with high gradient is required to be generated, the general test loop is difficult to realize, the test risk is very high, and the thyristor is extremely easy to damage.
The current test mode of the steep front surge voltage of the thyristor valve comprises the following steps: the first is to directly reduce the wave head resistance of the impulse voltage generator to generate the steep wave front impulse voltage with required steepness, which is very high in risk, because the wave head resistance must be reduced very little to reach the required steepness, so that the impulse voltage test circuit is insufficiently damped, the outgoing line oscillates at high frequency, and the thyristor is easily damaged. The second is a direct chopping mode, although the mode can generate the steep wave front surge voltage with required steepness, the surge voltage in the mode has no wave tail, the voltage is directly reduced to zero and reversely oscillates at the chopping moment, the amplitude and the frequency of the reversely oscillating voltage are high, and the thyristor is also easily damaged. The two test modes are high in risk and difficulty for a laboratory, and the test process is difficult to control and is easy to cause damage to the thyristor.
Disclosure of Invention
The invention aims to provide a thyristor valve steep wave front surge voltage test circuit and a test method thereof, which are used for solving the problems of high risk, high difficulty and difficult control of the conventional thyristor valve steep wave surge voltage test.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the first aspect of the invention provides a thyristor valve abrupt slope front surge voltage test circuit, which comprises a surge voltage generator, a power frequency energy storage power supply, a chopper ball gap, a thyristor valve and a control module;
the surge voltage generator is used for generating a surge voltage with a certain gradient so as to be applied to the thyristor valve;
the power frequency energy storage power supply provides power for an electronic control unit of the thyristor valve;
the chopper ball gap is used for generating a steep front surge voltage with required steepness and half peak value so as to be applied to the thyristor valve;
the control module is used for controlling the ignition time of the impulse voltage generator and the cutting time of the cutting spherical gap.
Further, the surge voltage generator includes: the main capacitor Cs, the ignition ball gap G1, the wave head resistor R1, the wave tail resistor R2, the isolation ball gap G2 and the weak damping voltage divider;
the main capacitor Cs is connected with the ignition ball gap G1 in series and then connected with the wave tail resistor R2 in parallel, then connected with the wave head resistor R1 in series and then connected with the weak damping voltage divider in parallel, and finally connected with the thyristor valve TO through the isolation ball gap G2.
Further, the weak damping voltage divider comprises a resistor R11, a capacitor C11, a resistor R12 and a capacitor C12 which are sequentially connected in series.
Further, the power frequency energy storage power supply includes: the power frequency power supply AC, the protection resistor R3, the protection capacitor C3, the lightning arrester F and the capacitor voltage divider are respectively connected in parallel with the protection capacitor C3 and the lightning arrester F at two ends of the power frequency power supply AC, then connected in series with the protection resistor R3, connected in parallel with the capacitor voltage divider and finally connected TO two ends of the thyristor valve TO.
Further, the chopping ball gap comprises a damping resistor R4, a chopping ball g1, a voltage-equalizing capacitor c1 thereof, a chopping ball g2, a voltage-equalizing capacitor c2 thereof, which are sequentially connected in series and finally connected TO two ends of the thyristor valve TO in parallel.
Further, the control module comprises an ignition ball gap control module and a chopping ball gap control module of the impulse voltage generator, which are respectively used for controlling the ignition time of the ignition ball gap and the chopping time of the chopping ball gap.
The second aspect of the invention provides a test method of the pre-steep slope surge voltage test circuit of the thyristor valve, which comprises the following steps:
step 1: according to the charge-discharge loop principle of the impulse voltage generator and the wave head time T1 and half-peak time T2 required by the impulse voltage waveform, calculating the resistance values of the wave head resistor R1 and the wave tail resistor R2 in the impulse voltage generator; calculating the resistance value of the damping resistor R4 under the condition of clipping;
step 2: building the thyristor valve steep front impact test circuit according to the resistance value calculated in the step 1;
step 3: operating a power frequency power supply AC, applying a required energy storage voltage TO the thyristor valve TO, and enabling an electronic control unit of the thyristor valve TO TO work;
step 4: the impulse voltage is regulated, an impulse voltage generator is operated, a main capacitor Cs is charged TO a required voltage, then an ignition ball gap G1 is triggered by an impulse voltage generator control module after the power frequency voltage is in positive zero crossing, the main capacitor Cs charges a thyristor valve TO through a wave head resistor R1 and a wave tail resistor R2, impulse voltage is generated on the thyristor valve TO, the amplitude, the wave head time and the half-peak time of the impulse voltage are measured, and the resistance values of the wave head resistor R1 and the wave tail resistor R2 are finely regulated as required until the impulse voltage waveform meets the requirement;
step 5: according to the gradient calculation requirement, calculating 100% of test voltage and the time of the wave head corresponding to the required gradient, wherein the time is the cutting-off time of the shock voltage wave head;
step 6: setting the ignition time of a chopper ball gap control module as the cut-off time calculated in the step 5, then operating a surge voltage generator, and charging a main capacitor Cs TO a required voltage, wherein the control module controls the ignition time and the cut-off time, automatically triggers an ignition ball gap G1 and the chopper ball gap, and charges a thyristor valve TO through a wave head resistor R1, a wave tail resistor R2, a damping resistor R4 and the chopper ball gap TO generate steep wave front surge voltage;
step 7: and (3) measuring the amplitude, the steepness and the half-peak time of the steep front surge voltage of the thyristor valve, if the waveform does not meet the requirement, trimming the resistance value of the damping resistor R4 and the Cs precharge voltage value according to the requirement, and repeating the operation of the step (6) until the steep front surge voltage test meets the requirement.
Further, the step 1 includes:
under the condition of no clipping: according to the formula r1=t1/2.4 [ (CsCt)/(cs+ct)]，R2＝T2/0.7(Cs+Ct)，Calculating the resistance of the wave head resistor R1 and the wave tail resistor R2; wherein T1 is the wave head time, T2 is the half peak time, ct is the thyristor valve TO capacitance, cs is the main capacitance, and L is the loop inductance;
under the condition of cutting wave: and calculating the resistance value of the damping resistor R4 corresponding to the half-peak time T2 meeting the requirement according to the formula R4 = T2/0.7 Cs.
Further, according to the formula s=0.6u/0.6T1, calculating the corresponding time T1 of the wave head under the required steepness, wherein the time is the cutting-off time of the impact voltage wave head; wherein S is steepness, U is test voltage, and T1 is wave head time.
In summary, the invention provides a circuit and a method for testing the surge voltage of a thyristor valve before abrupt slope, wherein the circuit comprises a surge voltage generator, a power frequency energy storage power supply, a chopper ball gap, a thyristor valve and a control module; the surge voltage generator is used for generating a surge voltage with a certain gradient so as to be applied to the thyristor valve; the power frequency energy storage power supply provides power for an electronic control unit of the thyristor valve; the chopper ball gap is used for generating a steep front surge voltage with required steepness and half peak value so as to be applied to the thyristor valve; the control module is used for controlling the ignition time of the impulse voltage generator and the cutting time of the cutting spherical gap. The invention simply and conveniently completes the steep wave front surge voltage test of the thyristor valve, generates the steep wave front surge voltage with controllable wave front time and half peak time for the thyristor valve, and compared with the traditional method of reducing the wave head resistance of the surge voltage generator and the direct wave cutting method, the invention ensures that the steep wave front surge voltage test of the thyristor valve is safer and easier, greatly reduces the test risk and difficulty and greatly improves the test efficiency.
Drawings
FIG. 1 is a schematic circuit diagram of a thyristor valve steep front surge voltage test circuit according to an embodiment of the invention;
fig. 2 is a test waveform diagram of a method for testing a steep front surge voltage of a thyristor valve according to an embodiment of the invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
As shown in FIG. 1, the circuit comprises a surge voltage generator, a power frequency energy storage power supply, a chopper ball gap, a thyristor valve and a control module, and forms a complete thyristor valve steep front surge voltage test circuit together. The surge voltage generator is used for generating a surge voltage with a certain gradient so as to be applied to the thyristor valve; the power frequency energy storage power supply provides power for the electronic control unit of the thyristor valve; the chopper ball gap is used for generating a steep front impact voltage with required steepness and half peak value so as to be applied to the thyristor valve; the control module is used for controlling the ignition time of the impulse voltage generator and the cutting time of the cutting spherical gap. The impulse voltage generator comprises a main capacitor Cs, an ignition ball gap G1, a wave head resistor R1, a wave tail resistor R2, an isolation ball gap G2 and a weak damping voltage divider, can generate impulse voltage with certain gradient, and is applied to the thyristor valve; the power frequency energy storage power supply comprises a power frequency power supply AC, a protection resistor R3, a protection capacitor C3, a lightning arrester F and a capacitive voltage divider, and provides energy required by work for an electronic control unit of the thyristor valve TO; the chopping ball gap comprises a damping resistor R4, a chopping ball gap g1, a voltage-equalizing capacitor c1 thereof, a chopping ball gap g2, and a voltage-equalizing capacitor c2 thereof; the control module comprises an ignition ball gap control module and a chopping ball gap control module of the impulse voltage generator.
The impulse voltage generator comprises a main capacitor Cs, an ignition ball gap G1, a wave head resistor R1, a wave tail resistor R2, an isolation ball gap G2 and a weak damping voltage divider, wherein the main capacitor Cs is connected with the ignition ball gap G1 in series, then connected with the wave tail resistor R2 in parallel, connected with the wave head resistor R1 in series and connected with the weak damping voltage divider in parallel, and finally connected with a thyristor valve TO through the isolation ball gap G2. The weak damping voltage divider comprises a resistor R11, a capacitor C11, a resistor R12 and a capacitor C12 which are sequentially connected in series, and is the prior art in the field.
The power frequency energy storage power supply comprises a power frequency power supply AC, a protection resistor R3, a protection capacitor C3, a lightning arrester F and a capacitive voltage divider, wherein the protection capacitor C3 and the lightning arrester F are connected in parallel at two ends of the power frequency power supply AC, then connected in series with the protection resistor R3, connected in parallel with the capacitive voltage divider and finally connected TO a thyristor valve TO.
The chopper ball gap comprises a damping resistor R4, a chopper ball g1, a voltage-sharing capacitor c1 thereof, a chopper ball g2, a voltage-sharing capacitor c2 thereof, which are sequentially connected in series and finally connected in parallel TO the thyristor valve TO.
The control module comprises an ignition ball gap control module and a chopping ball gap control module of the impulse voltage generator, and the control module is respectively used for controlling the ignition time of the ignition ball gap and the chopping time of the chopping ball gap.
The second aspect of the invention provides a test method of the surge voltage test circuit before the abrupt slope of the thyristor valve, which comprises the following operation steps:
step 1: according to the charge-discharge loop principle of the impulse voltage generator and the wave head time T1 and half-peak time T2 required by the impulse voltage waveform, calculating the resistance values of the wave head resistor R1 and the wave tail resistor R2 in the impulse voltage generator; and calculating the resistance value of the damping resistor R4 under the chopping condition.
Specifically, under the condition of no clipping: according to the formula r1=t1/2.4 [ (CsCt)/(cs+ct)]，R2＝T2/0.7(Cs+Ct)，Wherein T1 is the wave head time, T2 is half-peak time, ct is the thyristor valve TO capacitor, cs is the main capacitor and L loop inductance, and the resistance values of the wave head resistor R1 and the wave tail resistor R2 are calculated; under the condition of cutting wave: and calculating the resistance value of the damping resistor R4 corresponding to the half-peak time T2 meeting the requirement according to the formula R4 = T2/0.7 Cs.
Step 2: according to the resistance value calculated in the step 1, a thyristor valve steep front impact test circuit is built according to the test circuit.
Step 3: and operating a power frequency power supply AC, applying a required energy storage voltage TO the thyristor valve TO, and enabling an electronic control unit of the thyristor valve TO TO work.
Step 4: the surge voltage wave-regulating test is carried out, a surge voltage generator is operated, a main capacitor Cs is charged TO a required voltage, then a control module of the surge voltage generator triggers an ignition ball gap G1 after the power frequency voltage is in positive zero crossing, the main capacitor Cs charges a thyristor valve TO through a wave head resistor R1 and a wave tail resistor R2, surge voltage is generated on the thyristor valve TO, the amplitude, wave head time and half-peak time of the surge voltage are measured, and the resistance values of the wave head resistor R1 and the wave tail resistor R2 are finely adjusted as required until the surge voltage waveform meets the requirement.
Step 5: according to the gradient calculation requirement, calculating 100% of test voltage and the time of the wave head corresponding to the required gradient, wherein the time is the cutting-off time of the shock voltage wave head.
Specifically, according to the formula s=0.6u/0.6T1, where S is the steepness, U is the test voltage, T1 is the time of the wave head, and the time of the wave head T1 corresponding to 100% U and the required steepness is calculated, which is the chopping time of the impact voltage wave head.
Step 6: setting the ignition time of the chopping ball gap control module as the chopping time calculated in the step 5, then operating the impulse voltage generator, charging the main capacitor Cs TO the required voltage, controlling the ignition time and the chopping time by the control module, automatically triggering the ignition ball gap G1 and the chopping ball gap, and charging the thyristor valve TO by the main capacitor Cs through the wave head resistor R1, the wave tail resistor R2, the damping resistor R4 and the chopping ball gap TO generate steep wave front impulse voltage.
Step 7: and (3) measuring the amplitude, the steepness and the half-peak time of the steep front surge voltage of the thyristor valve, if the waveform does not meet the requirement, trimming the resistance value of the damping resistor R4 and the Cs precharge voltage value according to the requirement, and repeating the operation of the step (6) until the steep front surge voltage test meets the requirement.
The waveform of the test of the steep front surge voltage of the thyristor valve obtained by the embodiment is shown in figure 2.
In summary, the invention provides a circuit and a method for testing the surge voltage of a thyristor valve before abrupt slope, wherein the circuit comprises a surge voltage generator, a power frequency energy storage power supply, a chopper ball gap, a thyristor valve and a control module; the surge voltage generator is used for generating a surge voltage with a certain gradient so as to be applied to the thyristor valve; the power frequency energy storage power supply provides power for an electronic control unit of the thyristor valve; the chopper ball gap is used for generating a steep front surge voltage with required steepness and half peak value so as to be applied to the thyristor valve; the control module is used for controlling the ignition time of the impulse voltage generator and the cutting time of the cutting spherical gap. The invention simply and conveniently completes the steep wave front surge voltage test of the thyristor valve, generates the steep wave front surge voltage with controllable wave front time and half peak time for the thyristor valve, and compared with the traditional method of reducing the wave head resistance of the surge voltage generator and the direct wave cutting method, the invention ensures that the steep wave front surge voltage test of the thyristor valve is safer and easier, greatly reduces the test risk and difficulty and greatly improves the test efficiency.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (8)
1. The test method of the thyristor valve abrupt slope front surge voltage test circuit is characterized in that the thyristor valve abrupt slope front surge voltage test circuit comprises a surge voltage generator, a power frequency energy storage power supply, a wave cutting ball gap, a thyristor valve and a control module;
the surge voltage generator is used for generating a surge voltage with a certain gradient so as to be applied to the thyristor valve;
the power frequency energy storage power supply provides power for an electronic control unit of the thyristor valve;
the chopper ball gap is used for generating a steep front surge voltage with required steepness and half peak value so as to be applied to the thyristor valve;
the control module is used for controlling the ignition time of the impulse voltage generator and the cutting time of the cutting spherical gap;
the test method comprises the following steps:
step 1: according to the charge-discharge loop principle of the impulse voltage generator and the wave head time T1 and half-peak time T2 required by the impulse voltage waveform, calculating the resistance values of the wave head resistor R1 and the wave tail resistor R2 in the impulse voltage generator; calculating the resistance value of the damping resistor R4 under the condition of clipping;
step 2: building the thyristor valve steep front impact test circuit according to the resistance value calculated in the step 1;
step 3: operating a power frequency power supply AC, applying a required energy storage voltage TO the thyristor valve TO, and enabling an electronic control unit of the thyristor valve TO TO work;
step 4: the impulse voltage is regulated, an impulse voltage generator is operated, a main capacitor Cs is charged TO a required voltage, then an ignition ball gap G1 is triggered by an impulse voltage generator control module after the power frequency voltage is in positive zero crossing, the main capacitor Cs charges a thyristor valve TO through a wave head resistor R1 and a wave tail resistor R2, impulse voltage is generated on the thyristor valve TO, the amplitude, the wave head time and the half-peak time of the impulse voltage are measured, and the resistance values of the wave head resistor R1 and the wave tail resistor R2 are finely regulated as required until the impulse voltage waveform meets the requirement;
step 5: according to the gradient calculation requirement, calculating 100% of test voltage and the time of the wave head corresponding to the required gradient, wherein the time is the cutting-off time of the shock voltage wave head;
step 6: setting the ignition time of a chopper ball gap control module as the cut-off time calculated in the step 5, then operating a surge voltage generator, and charging a main capacitor Cs TO a required voltage, wherein the control module controls the ignition time and the cut-off time, automatically triggers an ignition ball gap G1 and the chopper ball gap, and charges a thyristor valve TO through a wave head resistor R1, a wave tail resistor R2, a damping resistor R4 and the chopper ball gap TO generate steep wave front surge voltage;
step 7: and (3) measuring the amplitude, the steepness and the half-peak time of the steep front surge voltage of the thyristor valve, if the waveform does not meet the requirement, trimming the resistance value of the damping resistor R4 and the Cs precharge voltage value according to the requirement, and repeating the operation of the step (6) until the steep front surge voltage test meets the requirement.
2. The method of testing a pre-steep slope surge voltage test circuit for a thyristor valve according to claim 1, wherein the surge voltage generator comprises: the main capacitor Cs, the ignition ball gap G1, the wave head resistor R1, the wave tail resistor R2, the isolation ball gap G2 and the weak damping voltage divider;
the main capacitor Cs is connected with the ignition ball gap G1 in series and then connected with the wave tail resistor R2 in parallel, then connected with the wave head resistor R1 in series and then connected with the weak damping voltage divider in parallel, and finally connected with the thyristor valve TO through the isolation ball gap G2.
3. The method for testing the pre-steep slope surge voltage test circuit of the thyristor valve according to claim 2, wherein the weak damping voltage divider comprises a resistor R11, a capacitor C11, a resistor R12 and a capacitor C12 which are sequentially connected in series.
4. A method of testing a thyristor valve pre-steep slope surge voltage test circuit according to any of claims 1-3, wherein the mains frequency energy storage power supply comprises: the power frequency power supply AC, the protection resistor R3, the protection capacitor C3, the lightning arrester F and the capacitor voltage divider are respectively connected in parallel with the protection capacitor C3 and the lightning arrester F at two ends of the power frequency power supply AC, then connected in series with the protection resistor R3, connected in parallel with the capacitor voltage divider and finally connected TO two ends of the thyristor valve TO.
5. A test method of a pre-steep slope surge voltage test circuit of a thyristor valve according TO any of claims 1-3, wherein the chopper ball gap comprises a damping resistor R4, a chopper ball g1 and a equalizing capacitor c1 thereof, a chopper ball g2 and an equalizing capacitor c2 thereof, which are sequentially connected in series and finally connected in parallel TO both ends of the thyristor valve TO.
6. A method of testing a pre-steep slope surge voltage test circuit for a thyristor valve according to any of claims 1-3, wherein the control module comprises a surge voltage generator ignition ball gap control module and a chopping ball gap control module for controlling the ignition time of the ignition ball gap and the chopping time of the chopping ball gap, respectively.
7. The method for testing the pre-steep slope surge voltage test circuit according to claim 1, wherein the step 1 comprises:
under the condition of no clipping: according to the formula r1=t12.4 [ (CsCt)/(cs+ct)]，R2＝T20.7(Cs+Ct)，Calculating the resistance of the wave head resistor R1 and the wave tail resistor R2; wherein T1 is the wave head time, T2 is the half peak time, ct is the thyristor valve TO capacitance, cs is the main capacitance, and L is the loop inductance;
under the condition of cutting wave: and calculating the resistance value of the damping resistor R4 corresponding to the half-peak time T2 meeting the requirement according to the formula R4 = T20.7Cs.
8. The test method of a pre-steep slope surge voltage test circuit of a thyristor valve according to claim 1 or 7, wherein 100% u and a corresponding time T1 of the wave head under the required steepness, which is the break time of the surge voltage wave head, are calculated according to the formula s= 0.6U0.6T1; wherein S is steepness, U is test voltage, and T1 is wave head time.
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