Lightning impulse testing device of high-power high-voltage resistor

Abstract

The utility model provides a lightning impulse testing device for a high-power high-voltage resistor, which is used for solving the technical problem that the conventional lightning impulse testing device can only carry out lightning impulse testing on a high-resistance high-power high-voltage resistor and cannot carry out lightning impulse testing on a low-resistance high-power high-voltage resistor below dozens of ohms. According to the lightning impulse testing device of the high-power high-voltage resistor provided by the utility model, the pulse capacitor is arranged in the power supply module, and the pulse capacitor is composed of a plurality of pulse capacitors; the lightning impulse test of the high-power high-voltage resistor with different resistance values can be realized by simply adjusting the connection mode of the plurality of pulse capacitors in the pulse capacitor or increasing or decreasing the number of the pulse capacitors, and a rapid and efficient lightning impulse measurement mode is provided for the high-power high-voltage resistor with a wide resistance value range.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lightning impact testing device of resistor especially relates to a lightning impact testing device of high -power high -voltage resistor. BACKGROUND

[0002] At present, high -power high -voltage resistor is famous in the world because of its thermal capacity, withstand voltage, low temperature rise, inductance, and its short -time heat absorption capacity can reach 600J / cm3, and it has been widely used in high -voltage, superhigh -voltage transmission, distribution field and power station, vehicle, radar, laser field etc. Because the electrical equipment of these fields is usually arranged outdoors, often affected by lightning impact, so high -power high -voltage resistor needs to carry out lightning impact test before being put into use to confirm whether its lightning resistance meets the requirements, thereby avoiding the failure caused by unqualified lightning resistance.

[0003] The resistance range of high -power high -voltage resistor is relatively large, but the existing lightning impact testing device can only carry out lightning impact test of high -power high -voltage resistor of large resistance, and cannot carry out lightning impact test to high -power high -voltage resistor of small resistance below several tens of ohms, so how to effectively carry out lightning impact test to high -power high -voltage resistor of resistance range becomes the urgent need of electric power industry. UTILITY MODEL CONTENTS

[0004] The utility model discloses a lightning impact testing device of high -power high -voltage resistor, and the lightning impact testing device comprises a power supply module, a discharge gap, a lightning wave generating module and a measuring module.

[0005] In order to realize the above-mentioned purpose, the utility model provides the technical scheme as follows:

[0006] A lightning impact testing device of high -power high -voltage resistor, which is characterized by comprising a power supply module, a discharge gap, a lightning wave generating module and a measuring module.

[0007] The power supply module comprises an alternating current power supply, a rectifier transformer, a pulse capacitor, a first current -limiting resistor and a second current -limiting resistor.

[0008] One end of the primary side of the rectifier transformer is connected with the positive terminal of the alternating current power supply through the first current -limiting resistor, and the other end of the primary side is connected with the negative terminal of the alternating current power supply, for boosting and converting alternating current into direct current.

[0009] The pulse capacitor comprises n pulse capacitors, and n is greater than or equal to 1;The n pulse capacitors are connected in parallel with each other, or the n pulse capacitors are connected in series one by one, and n is greater than or equal to 2;Or, every m pulse capacitors are connected in series and then connected in parallel with each other, n is an even number greater than or equal to 4, and 2 is less than n.

[0010] The output positive terminal of the rectifier transformer is connected with the high terminal of the pulse capacitor through a second current-limiting resistor, and the output negative terminal is connected with the low terminal of the pulse capacitor and grounded, for supplying power to the pulse capacitor;

[0011] One end of the discharge gap is connected with the high terminal of the pulse capacitor, for discharging the pulse capacitor;

[0012] The input terminal of the lightning wave generating module is connected with the other end of the discharge gap, and the output terminal is connected with one end of the test product, and the other end of the test product is grounded, for generating a lightning impulse waveform according to the discharge voltage of the pulse capacitor to perform lightning impulse test on the test product;

[0013] The measuring module is used for measuring the voltage value and the current value passing through the test product during the lightning impulse test.

[0014] Further, a voltage divider is further included;

[0015] The voltage divider is connected in parallel between the high terminal and the low terminal of the pulse capacitor, for measuring the charging voltage between the two terminals of the pulse capacitor.

[0016] Further, the lightning wave generating module includes a front wave resistance, a tail wave resistance and a front wave inductance;

[0017] One end of the front wave resistance is connected with the other end of the discharge gap, and the other end is connected with one end of the front wave inductance; one end of the test product is connected with the other end of the front wave inductance, and the other end is grounded; one end of the tail wave resistance is connected with the other end of the discharge gap, and the other end is connected with the other end of the test product.

[0018] Further, the measuring module includes a resistance-capacitance voltage divider and a Rogowski coil;

[0019] The resistance-capacitance voltage divider is connected in parallel between the two terminals of the test product, for measuring the voltage value between the two terminals of the test product during the lightning impulse test;

[0020] One end of the test product is grounded after passing through the Rogowski coil, for measuring the current value passing through the test product during the lightning impulse test through the Rogowski coil.

[0021] Further, the measuring module further includes an oscilloscope;

[0022] The input terminals of the oscilloscope are respectively connected with the low voltage output terminal of the resistance-capacitance voltage divider and the output terminal of the Rogowski coil, for waveform display of the measured voltage and current.

[0023] Further, a touch screen is further included;

[0024] The input end of the touch screen is connected with the output end of the voltage divider, and is used for displaying the current charging voltage value of the pulse capacitor measured by the voltage divider and a speed curve in the charging process, so as to control the charging process.

[0025] Further, the rectifier transformer comprises a step-up transformer and a rectifier silicon stack.

[0026] One end of the primary side of the step-up transformer is connected with the positive end of the AC power supply through a first current-limiting resistor, and the other end of the primary side is connected with the negative end of the AC power supply.

[0027] One end of the secondary side of the step-up transformer is connected with the input end of the rectifier silicon stack, the output end of the rectifier silicon stack is connected with the high end of the pulse capacitor through a second current-limiting resistor, and the other end of the secondary side of the step-up transformer is connected with the low end of the pulse capacitor and grounded.

[0028] Further, the AC power supply is an AC 220 power supply or an AC 380V power supply.

[0029] Compared with the prior art, the utility model has the beneficial effects that:

[0030] 1、The lightning impulse test device of the high-power high-voltage resistor provided by the utility model is provided with a pulse capacitor in the power supply module, and the pulse capacitor is composed of multiple pulse capacitors, and the lightning impulse test of the high-power high-voltage resistor with different resistance values can be realized by simply adjusting the connection mode of the multiple pulse capacitors in the pulse capacitor or increasing or decreasing the number of pulse capacitors, thereby providing a fast and efficient lightning impulse measurement mode for the high-power high-voltage resistor with a wide resistance range.

[0031] 2、The lightning impulse test device improves the lightning impulse resistance performance of the high-power high-voltage resistor through the large capacity of the pulse capacitor, and verifies the energy performance of the test product through the output voltage of the pulse capacitor, which can not only meet the lightning impulse test of the high-power high-voltage resistor with medium and large resistance values, but also meet the lightning impulse test of the high-power high-voltage resistor with small resistance values, and has the advantages of simple structure, compact connection, convenient assembly, small equipment area, and the use of conventional materials for electrical components, thereby effectively reducing the cost and being suitable for the lightning impulse test of high-energy chip resistors, ceramic thick film resistors, metal film resistors and high-energy wire wound resistors. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic view of the lightning impulse test device of the high-power high-voltage resistor of the utility model;

[0033] Figure 2The voltage waveform graph and the current waveform graph obtained by using the embodiment of the utility model for the lightning impulse test on the test product of 5.09 ohm when the charging voltage is 25kV and the impulse voltage is 11.25kV, wherein the red curve is the voltage waveform, and the blue curve is the current waveform.

[0034] Figure 3 The voltage waveform graph and the current waveform graph obtained by using the embodiment of the utility model for the lightning impulse test on the test product of 5.09 ohm when the charging voltage is 35kV and the impulse voltage is 15.83kV, wherein the red curve is the voltage waveform, and the blue curve is the current waveform.

[0035] Figure 4 The voltage waveform graph and the current waveform graph obtained by using the embodiment of the utility model for the lightning impulse test on the test product of 5.09 ohm when the charging voltage is 45kV and the impulse voltage is 20.49kV, wherein the red curve is the voltage waveform, and the blue curve is the current waveform.

[0036] Specific reference signs are:

[0037] 1 - AC power supply; 2 - first current-limiting resistor; 3 - step-up transformer; 4 - rectifier silicon stack; 5 - second current-limiting resistor; 6 - voltage divider; 7 - pulse capacitor; 8 - discharge gap; 9 - tail resistance; 10 - head resistance; 11 - head inductance; 12 - test product; 13 - resistance-capacitance voltage divider; 14 - oscilloscope; 15 - grounding point; 16 - Rogowski coil. DETAILED DESCRIPTION

[0038] In order to make the advantages and characteristics of the utility model more clear, the utility model is further described in detail below in combination with the drawings and specific embodiments.

[0039] As Figure 1 shown, a lightning impulse test device for a high-power high-voltage resistor comprises a power supply module, a voltage divider 6, a discharge gap 8, a lightning wave generating module, and a measurement module.

[0040] The power supply module comprises an AC power supply 1, a rectifier transformer, a pulse capacitor 7, a first current-limiting resistor 2, and a second current-limiting resistor 5. The AC power supply 1 is an AC 220 power supply or an AC 380V power supply, and in this embodiment, the AC power supply 1 is an AC 380V power supply; the rectifier transformer comprises a step-up transformer 3 and a rectifier silicon stack 4, one end of the primary side of the step-up transformer 3 is connected to the positive terminal of the AC power supply 1 through the first current-limiting resistor 2, the other end of the primary side is connected to the negative terminal of the AC power supply 1, one end of the secondary side of the step-up transformer 3 is connected to the input end of the rectifier silicon stack 4, for boosting through the step-up transformer 3 and converting AC into DC through the rectifier silicon stack 4. The first current-limiting resistor 2 is mainly used for limiting voltage to prevent the rectifier transformer from failing due to too fast charging.

[0041] The pulse capacitor 7 comprises n pulse capacitors, n≥1, which are respectively denoted as a pulse capacitor C1, a pulse capacitor C2, …, and a pulse capacitor Cn, and four pulse capacitors are connected in parallel in this embodiment. The output end of the rectifier silicon stack 4 is connected to one end of the four pulse capacitors through the second current-limiting resistor 5, and the other end of the secondary side of the step-up transformer 3 is connected to the other end of the four pulse capacitors and grounded, for inputting the converted direct current into the pulse capacitor 7 and supplying power to the pulse capacitor 7. The second current-limiting resistor 5 is used for limiting the charging speed and preventing overcharging caused by too fast charging, and is also used for current limiting, so that the pulse capacitor 7 can be quickly discharged (high voltage stored in the pulse capacitor 7) through the second current-limiting resistor 5 when an emergency fault occurs in the circuit.

[0042] In other embodiments of the utility model, the plurality of pulse capacitors in the pulse capacitor 7 can also be connected in series in turn, or when n is an even number greater than or equal to 4, every m pulse capacitors are connected in series and then connected in parallel with each other, and m is less than n and greater than or equal to 2. The parallel connection of the plurality of pulse capacitors is used to realize the lightning impulse test of small resistance test samples, the series connection of the plurality of pulse capacitors is used to realize the lightning impulse test of large resistance test samples, and the series connection of every m pulse capacitors and then the parallel connection of each other can realize the lightning impulse test of test samples with resistance values between large resistance and small resistance.

[0043] The voltage divider 6 is connected in parallel between the high end and the low end of the pulse capacitor 7, that is, one end of the voltage divider 6 is connected between the second current-limiting resistor 5 and the pulse capacitor C1, and the other end is grounded, for measuring the charging voltage between the two ends of the pulse capacitor 7. One end of the discharge gap 8 is connected to one end of the pulse capacitor Cn, for discharging the pulse capacitor 7.

[0044] The lightning wave generating module comprises a wave head resistor 10, a wave tail resistor 9, and a wave head inductor 11. One end of the wave head resistor 10 is connected to the other end of the discharge gap 8, and the other end thereof is connected to one end of the wave head inductor 11. One end of the wave tail resistor 9 is connected to the other end of the discharge gap 8, and the other end thereof is grounded. One end of the test sample 12 is connected to the other end of the wave head inductor 11, and the other end thereof is grounded. When the lightning impulse test is performed on test samples 12 with different resistance values, not only the connection mode of the plurality of pulse capacitors in the pulse capacitor 7 and the number of pulse capacitors need to be adjusted according to the lightning impulse resistance of the test sample 12, but also the sizes of the wave head resistor 10, the wave tail resistor 9, and the wave head inductor 11 need to be adjusted to generate different lightning impulse waveforms.

[0045] The measuring module comprises a resistance-capacitance voltage divider 13, a Rogowski coil 16 and an oscilloscope 14. The resistance-capacitance voltage divider 13 is connected in parallel across the high-power high-voltage resistor to be measured, and is used to measure the voltage across the test piece 12 during a lightning impulse. The wire connected to the other end of the test piece 12 passes through the Rogowski coil 16 and is then connected to the ground 15, and is used to measure the current flowing through the test piece 12 via the Rogowski coil 16. The input terminals of the oscilloscope 14 are connected to the low-voltage output terminals of the resistance-capacitance voltage divider and the output terminal of the Rogowski coil 16, respectively, and are used to display the waveforms of the measured voltage and current. In addition, a touch screen is also provided in the embodiment, and the input terminal of the touch screen is connected to the output terminal of the voltage divider 6, and is used to display the current charging voltage of the pulse capacitor 7 measured by the voltage divider 6 and the speed curve during the charging process, and to control the charging process.

[0046] The rectifier silicon stack 4, the n pulse capacitors, the tail resistance 9, the resistance-capacitance voltage divider 13, the oscilloscope 14 and the test piece 12 are all connected to the ground.

[0047] The following are the voltage waveform and current waveform obtained by the lightning impulse test device of the present application when the test piece 12 (high-power high-voltage resistor) with a resistance of 5.09 ohms (small resistance) is subjected to a lightning impulse test, wherein Figure 2 The voltage waveform and current waveform obtained by the lightning impulse test device of the present application when the test piece 12 is subjected to a lightning impulse test at a charging voltage of 25 kV and an impulse voltage of 11.25 kV, Figure 3 The voltage waveform and current waveform obtained by the lightning impulse test device of the present application when the test piece 12 is subjected to a lightning impulse test at a charging voltage of 35 kV and an impulse voltage of 15.83 kV, Figure 4 The voltage waveform and current waveform obtained by the lightning impulse test device of the present application when the test piece 12 is subjected to a lightning impulse test at a charging voltage of 45 kV and an impulse voltage of 20.49 kV. The red curve is the voltage waveform, and the blue curve is the current waveform. It can be seen that the lightning impulse test device of the present application can satisfy the lightning impulse test of a small-resistance high-power high-voltage resistor.

[0048] The above description is only to illustrate the technical solutions of the present application, and is not a limitation. For ordinary professional technicians in the field, the specific technical solutions described in the above embodiments can be modified, or some technical features can be replaced, and these modifications or replacements do not change the essence of the corresponding technical solutions from the scope of the technical solutions protected by the present application.

Claims

1. A lightning impulse test device for high-power high-voltage resistors, comprising a power supply module, a discharge gap (8), a lightning wave generating module and a measurement module; the power supply module comprises an AC power supply (1), a rectifier transformer, a pulse capacitor (7), a first current-limiting resistor (2) and a second current-limiting resistor (5); one end of the primary side of the rectifier transformer is connected to the positive terminal of the AC power supply (1) through the first current-limiting resistor (2), and the other end of the primary side is connected to the negative terminal of the AC power supply (1) for boosting and converting AC to DC; the pulse capacitor (7) comprises n pulse capacitors, n≥1; the n pulse capacitors are connected in parallel with each other, or the n pulse capacitors are connected in series one by one, n≥2; or, every m pulse capacitors are connected in series and then connected in parallel with each other, n is an even number greater than or equal to 4, and 2≤m<n; the output positive terminal of the rectifier transformer is connected to the high terminal of the pulse capacitor (7) through the second current-limiting resistor (5), and the output negative terminal is connected to the low terminal of the pulse capacitor (7) and grounded for supplying power to the pulse capacitor (7); one end of the discharge gap (8) is connected to the high terminal of the pulse capacitor (7) for discharging the pulse capacitor (7); the input end of the lightning wave generating module is connected to the other end of the discharge gap (8), and the output end is connected to one end of the test sample (12), and the other end of the test sample (12) is grounded for generating a lightning impulse waveform according to the discharge voltage of the pulse capacitor (7) to perform lightning impulse test on the test sample (12); and the measurement module is used for measuring the voltage across the test sample (12) and the current through the test sample (12) during the lightning impulse test. 2.The lightning impulse test device for high-power high-voltage resistors according to claim 1, further comprising a voltage divider (6); the voltage divider (6) is connected in parallel between the high terminal and the low terminal of the pulse capacitor (7) for measuring the charging voltage across the pulse capacitor (7). 3.The lightning impulse test device for high-power high-voltage resistors according to claim 2, wherein the lightning wave generating module comprises a wave head resistor (10), a wave tail resistor (9) and a wave head inductor (11); one end of the wave head resistor (10) is connected to the other end of the discharge gap (8), and the other end is connected to one end of the wave head inductor (11); one end of the test sample (12) is connected to the other end of the wave head inductor (11), and the other end is grounded; one end of the wave tail resistor (9) is connected to the other end of the discharge gap (8), and the other end is connected to the other end of the test sample (12). 4.The lightning impulse test device for high-power high-voltage resistors according to any one of claims 1-3, wherein the measurement module comprises a resistor-capacitor voltage divider (13) and a Rogowski coil (16); the resistor-capacitor voltage divider (13) is connected in parallel across the test sample (12) for measuring the voltage across the test sample (12) during the lightning impulse test. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One end of the test product (12) is connected to the ground after passing through the Rogowski coil (16) for measuring the current value flowing through the test product (12) during the lightning impulse test.

5. The lightning impulse test device for high-power high-voltage resistors according to claim 4, characterized in that: The measuring module further comprises an oscilloscope (14); The input end of the oscilloscope (14) is connected to the low-voltage output end of the resistance-capacitance voltage divider (13) and the output end of the Rogowski coil (16) respectively, for waveform display of the measured voltage and current.

6. The lightning impulse test device for high-power high-voltage resistors according to claim 5, characterized in that: It further comprises a touch screen; The input end of the touch screen is connected to the output end of the voltage divider (6), for display of the current charging voltage value of the pulse capacitor (7) measured by the voltage divider (6) and the speed curve in the charging process, thereby controlling the charging process.

7. The lightning impulse test device for high-power high-voltage resistors according to claim 1, characterized in that: The rectifier transformer comprises a step-up transformer (3) and a rectifier silicon stack (4); One end of the primary side of the step-up transformer (3) is connected to the positive terminal of the AC power supply (1) through a first current-limiting resistor (2), and the other end of the primary side is connected to the negative terminal of the AC power supply (1); One end of the secondary side of the step-up transformer (3) is connected to the input end of the rectifier silicon stack (4), the output end of the rectifier silicon stack (4) is connected to the high end of the pulse capacitor (7) through a second current-limiting resistor (5), and the other end of the secondary side of the step-up transformer (3) is connected to the low end of the pulse capacitor (7) and grounded.

8. The lightning impulse test device for high-power high-voltage resistors according to claim 1, characterized in that: The AC power supply (1) is an AC 220 power supply or an AC 380V power supply.

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