CN220271483U - Direct-current voltage superposition impulse voltage test loop with protection device - Google Patents
Direct-current voltage superposition impulse voltage test loop with protection device Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 claims abstract description 20
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Abstract
A direct-current voltage superposition impulse voltage test loop with a protection device comprises an impulse voltage source, a direct-current voltage source, a protection device, measurement equipment and a test article; the impulse voltage source comprises an impulse voltage generator and a weak damping voltage divider which are arranged in parallel; the direct-current voltage source comprises a direct-current voltage generator, a grounding loop and a resistor voltage divider; the protection device comprises an isolation device, a blocking capacitor and a protection resistor; the measuring device comprises a universal voltage divider and a multichannel measuring instrument. The protection device is added in the direct-current voltage superposition impulse voltage test loop, so that the protection of the impulse voltage generator is realized, and reliable guarantee is provided for long-term electrified operation of the extra-high voltage electrical appliance test product.
Description
Technical Field
The utility model relates to the field of high-voltage electrical appliance detection, and is used for a direct-current voltage superposition impulse voltage test loop with a protection device.
Background
Along with the construction of extra-high voltage alternating current transmission engineering and extra-high voltage direct current transmission engineering of a power grid company, the adoption of intelligent electric equipment to form an intelligent transformer substation becomes the key point of future power grid construction.
The data indicate that the annual accident rate and failure rate of the electrical equipment are continuously reduced, but the actual operation condition and the type test condition indicate that the reasons of accidents or failures are mostly unstable in terms of reliability. In order to improve the reliability of the power grid, an electric company often requires a certain screening operation experience of the electric equipment when selecting the electric equipment, however, the current practical situation is that the direct screening operation opportunity is often difficult to obtain for new products of many factories, especially products with extra-high voltage level. Therefore, in order to solve this contradiction, it is necessary to provide a simulation test device for a net hanging operation for a device manufacturing factory to check the long-term reliability of the device. The direct current superposition impulse voltage test loop consists of an impulse voltage source, a direct current voltage source, measuring equipment and a test sample. The test sample is subjected to a long-term live test and a state check after the live test, and the test sample is subjected to a state check of a direct-current voltage superposition impulse voltage test after the long-term live test, and the intermediate interval time is short, so that the test sample cannot be grounded, an impulse voltage source is strung in a test loop at the beginning of the test, the direct-current voltage is blocked by a blocking capacitor, and if the blocking capacitor is subjected to discharge or breakdown, the direct-current voltage is directly added to lightning impulse equipment, so that the equipment is damaged.
Disclosure of Invention
In order TO solve the problems, the utility model provides a direct-current voltage superposition surge voltage test loop with a protection device, which comprises a surge voltage source, a direct-current voltage source, a protection device, measurement equipment and a test sample TO. When the test sample TO is electrified for a long time, the ground knife is closed by the disconnecting and isolating device TO isolate the impulse voltage generator, so that the protection of the impulse voltage generator is realized, the safety of the long-term operation of the test sample is obviously improved, and the test delay or failure caused by additional factors in the test process is eliminated.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme:
a DC voltage superposition surge voltage test loop with a protection device comprises a surge voltage source and a DC voltageThe device comprises a pressure source, a protection device, measurement equipment and a test sample TO; the impulse voltage source comprises an impulse voltage generator IG and a weak damping voltage divider which are arranged in parallel; the direct-current voltage source comprises a direct-current voltage generator DCG, a grounding loop and a resistor divider, and the direct-current voltage generator DCG is connected with a protection resistor R of the equipment in series p Then, the ground loop and the resistor divider are connected in parallel; the protection device comprises an isolation device DS and a blocking capacitor C p Protection resistor R p2 The high-voltage end of the impulse voltage generator IG is connected with the No. 2 point of the isolation device DS and one end of the weak damping voltage divider, and the No. 1 point of the isolation device DS is connected with the blocking capacitor C p One end of the blocking capacitor C p The other end is connected with the high-voltage end of the test sample TO and the protection resistor R p2 High voltage end of (2) protection resistor R p2 The low-voltage end of the test sample TO is connected with the resistor voltage divider, and the other end of the weak damping voltage divider is connected with the low-voltage end of the impulse voltage generator IG; the measuring device comprises a universal voltage divider and a multi-channel measuring instrument, wherein the universal voltage divider is connected with the test sample TO in parallel, and the multi-channel measuring instrument is used for measuring the voltage of the weak damping voltage divider, the voltage of the universal voltage divider and the voltage of the resistor voltage divider.
Further, the surge generator IG comprises a charging capacitor C and a surge generator protection resistor R t And a charging resistor R f One end of the charging capacitor C is connected with one end of the ball gap triggering device S of the impulse voltage generator, and the other end of the ball gap triggering device S of the impulse voltage generator is connected with the protection resistor R of the impulse voltage generator t And a charging resistor R f One end of (1) is connected with a charging resistor R f The other end of the (2) is connected with the point 2 of the isolation device DS and one end of the weak damping voltage divider, and the surge voltage generator protection resistor R t The other end of the charge capacitor C is connected with the other end of the weak damping voltage divider.
Further, the weak damping voltage divider comprises a damping resistor R 1 High voltage arm capacitor C 1 And low voltage arm capacitor C 2 Damping resistor R 1 One end of (2) and a charging resistor R f The other end of the damping resistor R is connected with the No. 2 point of the isolation device DS 1 Is electrically connected with the other end of the high-voltage armCapacitor C 1 Is connected with one end of the high-voltage arm capacitor C 1 And the other end of the low voltage arm capacitor C 2 Is connected with one end of the low-voltage arm capacitor C 2 The other end of (2) is connected with a surge voltage generator protection resistor R t Is connected TO the other end of the sample TO.
Further, the direct current voltage generator DCG comprises a transformer TT, two capacitors C s Protective resistor R of transformer c Two silicon stacks D and a device protection resistor R p Device protection resistor R p The high voltage end of the (2) is connected with the high voltage end of the grounding loop, and the equipment protection resistor R p Is connected to the first capacitor C s A first capacitor C connected to the high voltage end of the first silicon stack D s The other end of the second silicon stack D is connected with the high voltage end of the second silicon stack D and the transformer protection resistor R c Transformer protection resistor R c The other end of the transformer TT is connected in series with one end of a second capacitor C s One end of the second capacitor C s The other end of the (C) is connected with the low-voltage ends of the two silicon stacks D.
Further, the ground loop comprises a discharge resistor R arranged in series e With a grounding switch K, the resistor divider comprises a high-voltage arm resistor R arranged in series 4 And low voltage arm resistor R 5 Discharge resistor R e High voltage terminal of (2) and protection resistor R p2 High voltage end of (2) 、 High voltage arm resistor R 4 High voltage terminal and equipment protection resistor R of (2) p Is connected with the high voltage end of the discharge resistor R e The low voltage end of the grounding switch K is connected with one end of the grounding switch K, and the other end of the grounding switch K is connected with the low voltage arm resistor R 5 Low voltage terminals of two silicon stacks D and a second capacitor C s Is connected with the other end of the connecting rod.
Further, the universal voltage divider comprises a high voltage arm resistor R 2 Low voltage arm resistor R 3 High voltage arm capacitor C 3 Low voltage arm capacitor C 4 And a digital voltmeter V, a high voltage arm resistor R 2 And high voltage arm capacitor C 3 The parallel connection forms a high-voltage arm and a low-voltage arm resistor R 3 Low voltage arm capacitor C 4 And digital electricityThe high-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is connected with the high-voltage end of the test sample TO, and the low-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is grounded; the multichannel measuring instrument is particularly used for measuring the resistance R of the high-voltage arm 2 And low voltage arm resistor R 3 Voltage between 、 Low-voltage arm capacitor C 2 Voltage across 、 Voltage of digital voltmeter V 、 High voltage arm capacitor C 3 And low voltage arm capacitor C 4 Voltage between them and high voltage arm resistance R 4 And low voltage arm resistor R 5 Voltage between them.
Further, the isolating device DS includes an isolating switch and a grounding switch for grounding one side of the isolating switch.
Further, the isolator includes wiring board I, wiring board II, first insulator, the moving contact, the stationary contact, the switch base, vertical connecting rod, operating device case and second insulator, wiring board I is as the No. 1 point of isolating device DS, wiring board II is as the No. 2 point of isolating device DS, wiring board I and moving contact are connected, wiring board II and stationary contact are connected, first insulator and second insulator upper end are connected with moving contact and stationary contact respectively, first insulator lower extreme and switch base fixed connection, the vertical connecting rod lower extreme is installed at operating device case upper surface, the vertical connecting rod can drive moving contact and stationary contact or disconnection under the control of operating device case.
Further, the earthing switch includes ground sword mechanism, ground sword connecting rod and ground sword, and ground sword mechanism sets up in switch base lower part, and ground sword mechanism is located operating device case side, and ground sword connecting rod and ground sword assemble in switch base upper end, and during the use, ground sword mechanism can drive ground sword connecting rod, and then drives ground sword and contact or disconnection of stationary contact.
Further, the earth-knife mechanism is grounded, and the earth-knife mechanism is operated by an operating mechanism box.
Compared with the prior art, the utility model has the following beneficial technical effects:
a DC voltage superposition surge voltage test loop with a protection device comprises a surge voltage source, a DC voltage source and a protection deviceThe device comprises a protection device, measurement equipment and a test sample TO; the impulse voltage source comprises an impulse voltage generator IG and a weak damping voltage divider which are arranged in parallel; the direct-current voltage source comprises a direct-current voltage generator DCG, a grounding loop and a resistor divider, and the direct-current voltage generator DCG is connected with a protection resistor R of the equipment in series p Then, the ground loop and the resistor divider are connected in parallel; the protection device comprises an isolation device DS and a blocking capacitor C p Protection resistor R p2 The high-voltage end of the impulse voltage generator IG is connected with the No. 2 point of the isolation device DS and one end of the weak damping voltage divider, and the No. 1 point of the isolation device DS is connected with the blocking capacitor C p One end of the blocking capacitor C p The other end is connected with the high-voltage end of the test sample TO and the protection resistor R p2 High voltage end of (2) protection resistor R p2 The low-voltage end of the test sample TO is connected with the resistor voltage divider, and the other end of the weak damping voltage divider is connected with the low-voltage end of the impulse voltage generator IG; the measuring device comprises a universal voltage divider and a multi-channel measuring instrument, wherein the universal voltage divider is connected with the test sample TO in parallel, and the multi-channel measuring instrument is used for measuring the voltage of the weak damping voltage divider, the voltage of the universal voltage divider and the voltage of the resistor voltage divider. By adding an isolation device DS and a blocking capacitor C in the direct-current voltage superposition impulse voltage test loop p Protection resistor R p2 When the test product is electrified for a long time, the disconnecting switch is disconnected, the earth knife is closed TO protect the impulse voltage generator IG, and when the state is checked after the test, the disconnecting switch is closed TO separate the earth knife TO carry out the superposition test, so that the impulse voltage generator IG is effectively protected, and reliable guarantee is provided for the long-term electrified operation of the extra-high voltage electrical appliance test product TO.
Drawings
Fig. 1 is a schematic diagram of a dc voltage superimposed surge voltage test circuit according to the present utility model.
Wherein DCG is a direct current voltage generator, TT is a transformer, C s Is a capacitor, S is a ball gap trigger device of a surge voltage generator, R c R is the protection resistance of the transformer p For protecting the resistor, D is a silicon stack, R e Is a discharge resistor, K is a grounding switch, R 4 R is high voltage arm resistance 5 Is a low voltage arm resistor, C 3 Is at high pressureArm capacitance, C 4 Is a low-voltage arm capacitor, R 2 R is high voltage arm resistance 3 Is a low-voltage arm resistor, V is a resistor-capacitor voltage divider, R p2 To protect the resistance, C p Is a blocking capacitor, TO is a sample, IG is a surge voltage generator, C is a charging capacitor, R t Protection resistor for impulse voltage generator, R f For charging resistance, R 1 Is a damping resistor, C 1 Is a high-voltage arm capacitor C 2 The low-voltage arm capacitor is DS is an isolation device, and the DIVMS is a multi-channel measuring instrument.
Fig. 2 is a schematic structural view of the protective isolation device DS for long-term live superposition test according to the present utility model.
Wherein, 1 is wiring board I,2 is wiring board II,3 is first insulator, 4 is the moving contact, 5 is the static contact, 6 is the switch base, 7 is vertical connecting rod, 8 is ground sword mechanism, 9 is operating device case, 10 is the second insulator, 11 is ground sword connecting rod, 12 is the ground sword.
Detailed Description
The utility model is described in further detail below with reference to the attached drawing figures:
a direct-current voltage superposition impulse voltage test loop with a protection device comprises an impulse voltage source, a direct-current voltage source, a protection device, measurement equipment and a test sample TO; the impulse voltage source comprises an impulse voltage generator IG and a weak damping voltage divider which are arranged in parallel; the direct-current voltage source comprises a direct-current voltage generator DCG, a grounding loop and a resistor divider, and the direct-current voltage generator DCG is connected with a protection resistor R of the equipment in series p Then, the ground loop and the resistor divider are connected in parallel; the protection device comprises an isolation device DS and a blocking capacitor C p Protection resistor R p2 The high-voltage end of the impulse voltage generator IG is connected with the No. 2 point of the isolation device DS and one end of the weak damping voltage divider, and the No. 1 point of the isolation device DS is connected with the blocking capacitor C p One end of the blocking capacitor C p The other end is connected with the high-voltage end of the test sample TO and the protection resistor R p2 High voltage end of (2) protection resistor R p2 The low-voltage end of the test sample TO is connected with the resistor voltage divider, and the other end of the weak damping voltage divider is connected with the low-voltage end of the impulse voltage generator IG; the measuring device comprising a common partial pressureThe device is connected with the multichannel measuring instrument in parallel with the test sample TO, and the multichannel measuring instrument is used for measuring the voltage of the weak damping voltage divider, the voltage of the universal voltage divider and the voltage of the resistance voltage divider.
Specifically, the surge voltage generator IG includes a charging capacitor C and a surge voltage generator protection resistor R t And a charging resistor R f One end of the charging capacitor C is connected with one end of the ball gap triggering device S of the impulse voltage generator, and the other end of the ball gap triggering device S of the impulse voltage generator is connected with the protection resistor R of the impulse voltage generator t And a charging resistor R f One end of (1) is connected with a charging resistor R f The other end of the (2) is connected with the point 2 of the isolation device DS and one end of the weak damping voltage divider, and the surge voltage generator protection resistor R t The other end of the charge capacitor C is connected with the other end of the weak damping voltage divider.
In particular, the weak damping voltage divider comprises a damping resistor R 1 High voltage arm capacitor C 1 And low voltage arm capacitor C 2 Damping resistor R 1 One end of (2) and a charging resistor R f The other end of the damping resistor R is connected with the No. 2 point of the isolation device DS 1 And the other end of the capacitor (C) and the high voltage arm capacitor (C) 1 Is connected with one end of the high-voltage arm capacitor C 1 And the other end of the low voltage arm capacitor C 2 Is connected with one end of the low-voltage arm capacitor C 2 The other end of (2) is connected with a surge voltage generator protection resistor R t Is connected TO the other end of the sample TO.
Specifically, the dc voltage generator DCG includes a transformer TT, two capacitors C s Protective resistor R of transformer c Two silicon stacks D and a device protection resistor R p Device protection resistor R p The high voltage end of the (2) is connected with the high voltage end of the grounding loop, and the equipment protection resistor R p Is connected to the first capacitor C s A first capacitor C connected to the high voltage end of the first silicon stack D s The other end of the second silicon stack D is connected with the high voltage end of the second silicon stack D and the transformer protection resistor R c Transformer protection resistor R c The other end of the transformer is connected in series with the TTIs connected with a second capacitor C in series with the other end of the transformer TT s One end of the second capacitor C s The other end of the (C) is connected with the low-voltage ends of the two silicon stacks D.
Specifically, the ground circuit includes a discharge resistor R arranged in series e With a grounding switch K, the resistor divider comprises a high-voltage arm resistor R arranged in series 4 And low voltage arm resistor R 5 Discharge resistor R e High voltage terminal of (2) and protection resistor R p2 High voltage end of (2) 、 High voltage arm resistor R 4 High voltage terminal and equipment protection resistor R of (2) p Is connected with the high voltage end of the discharge resistor R e The low voltage end of the grounding switch K is connected with one end of the grounding switch K, and the other end of the grounding switch K is connected with the low voltage arm resistor R 5 Low voltage terminals of two silicon stacks D and a second capacitor C s Is connected with the other end of the connecting rod.
In particular, the universal voltage divider comprises a high voltage arm resistor R 2 Low voltage arm resistor R 3 High voltage arm capacitor C 3 Low voltage arm capacitor C 4 And a digital voltmeter V, a high voltage arm resistor R 2 And high voltage arm capacitor C 3 The parallel connection forms a high-voltage arm and a low-voltage arm resistor R 3 Low voltage arm capacitor C 4 The high-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is connected with the high-voltage end of the test sample TO, and the low-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is grounded; the multichannel measuring instrument is particularly used for measuring the resistance R of the high-voltage arm 2 And low voltage arm resistor R 3 Voltage between 、 Low-voltage arm capacitor C 2 Voltage across 、 Voltage of digital voltmeter V 、 High voltage arm capacitor C 3 And low voltage arm capacitor C 4 Voltage between them and high voltage arm resistance R 4 And low voltage arm resistor R 5 Voltage between 。
More preferably, the isolating device DS includes an isolating switch and a grounding switch for grounding one side of the isolating switch.
Specifically, the isolating switch comprises a wiring board I1, a wiring board II2, a first insulator 3, a moving contact 4, a fixed contact 5, a switch base 6, a vertical connecting rod 7, an operating mechanism box 9 and a second insulator 10, wherein the wiring board I1 is used as a No. 1 point of the isolating device DS, the wiring board II2 is used as a No. 2 point of the isolating device DS, the wiring board I1 is connected with the moving contact 4, the wiring board II2 is connected with the fixed contact 5, the upper ends of the first insulator 3 and the second insulator 10 are respectively connected with the moving contact 4 and the fixed contact 5, the lower end of the first insulator 3 is fixedly connected with the switch base 6, the lower end of the vertical connecting rod 7 is arranged on the upper surface of the operating mechanism box 9, and the vertical connecting rod 7 can drive the moving contact 4 to contact or disconnect with the fixed contact 5 under the control of the operating mechanism box 9.
Specifically, the grounding switch comprises a grounding knife mechanism 8, a grounding knife connecting rod 11 and a grounding knife 12, wherein the grounding knife mechanism 8 is arranged at the lower part of the switch base 6, the grounding knife mechanism 8 is positioned on the side surface of the operating mechanism box 9, the grounding knife connecting rod 11 and the grounding knife 12 are assembled at the upper end part of the switch base 6, and when the grounding knife mechanism is used, the grounding knife mechanism 8 can drive the grounding knife connecting rod 11 so as to drive the grounding knife 12 to contact or disconnect with the fixed contact 5.
More preferably, the earth-moving mechanism 8 is grounded, and the earth-moving mechanism 8 is operated by an operating mechanism box 9.
As shown in fig. 1, the capacitor C and the resistor R are charged t In parallel with the charging resistor R f Forming an impulse voltage generator IG in series; damping resistor R 1 High voltage arm capacitor C 1 And low voltage arm capacitor C 2 The series connection forms a weak damping voltage divider; high voltage arm resistor R 2 And high voltage arm capacitor C 3 The parallel connection forms a high-voltage arm and a low-voltage arm resistor R 3 Low voltage arm capacitor C 4 The low-voltage arm is connected with the digital voltmeter V in parallel, and the high-voltage arm and the low-voltage arm are connected in series to form a universal voltage divider; transformer TT and capacitor C s And transformer protection resistor R c Connected in series with the silicon stack D in parallel with the equipment protection resistor R p A DC voltage generator DCG formed by series connection; discharge resistor R e A grounding loop of the direct-current voltage generator is formed by the grounding loop and the grounding switch K; high voltage arm resistor R 4 And low voltage arm resistor R 5 A resistive voltage divider constituting the direct voltage generator DCG. The high voltage end of the DC voltage generator DCG is connected with the grounding loop and the high voltage end of the resistor divider in parallel, and the grounding ends are grounded, and the DC voltage is appliedGenerator DCG connects protection resistance R p2 Is provided with a protection resistor R p2 The other end of the resistor is connected with the high-voltage end of the test sample TO, and the resistor R is protected p2 Is grounded. The high-voltage end of the test sample TO is connected with the high-voltage end of the universal voltage divider, and the base of the universal voltage divider is grounded. The high-voltage end of the impulse voltage generator IG is connected with the high-voltage end of the weak damping voltage divider, and the low-voltage ends are grounded and connected in parallel to form an impulse voltage source.
As shown in fig. 1 and fig. 2, the high voltage end of the surge voltage generator IG in fig. 1 is connected to the point No. 2 of the isolation device DS in fig. 2, and the point No. 1 of the isolation device DS is connected to the blocking capacitor C p One end of the blocking capacitor C p The other end of the capacitor is connected with the high-voltage end of the test sample TO, and the blocking capacitor C p And the base of the isolation device is grounded. When the test sample is electrified for a long time, the disconnecting switch is disconnected, the earth knife 12 is closed to protect the impulse voltage generator IG, and when the test sample is checked in a post-test state, the disconnecting switch is closed, and the earth knife 12 is separated, so that a superposition test can be performed. The utility model aims TO provide protection for the impulse voltage generator IG and provide reliable guarantee for long-term electrified operation of the extra-high voltage electrical appliance test product TO.
Claims (10)
1. The direct-current voltage superposition impulse voltage test loop with the protection device is characterized by comprising an impulse voltage source, a direct-current voltage source, the protection device, measurement equipment and a test sample TO;
the impulse voltage source comprises an impulse voltage generator IG and a weak damping voltage divider which are arranged in parallel;
the direct-current voltage source comprises a direct-current voltage generator DCG, a grounding loop and a resistor divider, and the direct-current voltage generator DCG is connected with a protection resistor R of the equipment in series p Then, the ground loop and the resistor divider are connected in parallel;
the protection device comprises an isolation device DS and a blocking capacitor C p Protection resistor R p2 The high-voltage end of the impulse voltage generator IG is connected with the No. 2 point of the isolation device DS and one end of the weak damping voltage divider, and the No. 1 point of the isolation device DS is connected with the blocking capacitor C p One end of the blocking capacitor C p The other end is connected with the high-voltage end of the test sample TO and the protection resistor R p2 High pressure of (2)Terminal, protection resistor R p2 The low-voltage end of the test sample TO is connected with the resistor voltage divider, and the other end of the weak damping voltage divider is connected with the low-voltage end of the impulse voltage generator IG;
the measuring device comprises a universal voltage divider and a multi-channel measuring instrument, wherein the universal voltage divider is connected with the test sample TO in parallel, and the multi-channel measuring instrument is used for measuring the voltage of the weak damping voltage divider, the voltage of the universal voltage divider and the voltage of the resistor voltage divider.
2. The direct-current voltage superposition surge voltage testing circuit with protection device according to claim 1, wherein the surge voltage generator IG comprises a charging capacitor C and a surge voltage generator protection resistor R t And a charging resistor R f One end of the charging capacitor C is connected with one end of the ball gap triggering device S of the impulse voltage generator, and the other end of the ball gap triggering device S of the impulse voltage generator is connected with the protection resistor R of the impulse voltage generator t And a charging resistor R f One end of (1) is connected with a charging resistor R f The other end of the (2) is connected with the point 2 of the isolation device DS and one end of the weak damping voltage divider, and the surge voltage generator protection resistor R t The other end of the charge capacitor C is connected with the other end of the weak damping voltage divider.
3. The direct-current voltage superposition surge voltage testing loop with protection device according to claim 2, wherein said weak damping voltage divider comprises a damping resistor R 1 High voltage arm capacitor C 1 And low voltage arm capacitor C 2 Damping resistor R 1 One end of (2) and a charging resistor R f The other end of the damping resistor R is connected with the No. 2 point of the isolation device DS 1 And the other end of the capacitor (C) and the high voltage arm capacitor (C) 1 Is connected with one end of the high-voltage arm capacitor C 1 And the other end of the low voltage arm capacitor C 2 Is connected with one end of the low-voltage arm capacitor C 2 The other end of (2) is connected with a surge voltage generator protection resistor R t Is connected TO the other end of the sample TO.
4. A direct voltage superposition surge voltage testing loop with protecting equipment according to claim 3, wherein said direct voltage generator DCG comprises a transformer TT, two capacitors C s Protective resistor R of transformer c Two silicon stacks D and a device protection resistor R p Device protection resistor R p The high voltage end of the (2) is connected with the high voltage end of the grounding loop, and the equipment protection resistor R p Is connected to the first capacitor C s A first capacitor C connected to the high voltage end of the first silicon stack D s The other end of the second silicon stack D is connected with the high voltage end of the second silicon stack D and the transformer protection resistor R c Transformer protection resistor R c The other end of the transformer TT is connected in series with one end of a second capacitor C s One end of the second capacitor C s The other end of the (C) is connected with the low-voltage ends of the two silicon stacks D.
5. The direct-current voltage superposition surge voltage testing circuit with protecting equipment according to claim 4, wherein said grounding circuit comprises a series-arranged discharge resistor R e With a grounding switch K, the resistor divider comprises a high-voltage arm resistor R arranged in series 4 And low voltage arm resistor R 5 Discharge resistor R e High voltage terminal of (2) and protection resistor R p2 High voltage end of (2) 、 High voltage arm resistor R 4 High voltage terminal and equipment protection resistor R of (2) p Is connected with the high voltage end of the discharge resistor R e The low voltage end of the grounding switch K is connected with one end of the grounding switch K, and the other end of the grounding switch K is connected with the low voltage arm resistor R 5 Low voltage terminals of two silicon stacks D and a second capacitor C s Is connected with the other end of the connecting rod.
6. The direct-current voltage superposition surge voltage testing circuit with protection device according to claim 5, wherein said universal voltage divider comprises a high-voltage arm resistor R 2 Low voltage arm resistor R 3 High voltage arm capacitor C 3 Low voltage arm capacitor C 4 And a digital voltmeter V, a high voltage arm resistor R 2 And high voltage arm capacitor C 3 The parallel connection forms a high-voltage arm and a low-voltage arm resistor R 3 Low voltage arm capacitor C 4 The high-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is connected with the high-voltage end of the test sample TO, and the low-voltage end of the high-voltage arm and the low-voltage arm which are connected in series is grounded;
the multichannel measuring instrument is particularly used for measuring the resistance R of the high-voltage arm 2 And low voltage arm resistor R 3 Voltage, low voltage arm capacitance C between 2 Voltage at two ends, voltage of digital voltmeter V and high voltage arm capacitor C 3 And low voltage arm capacitor C 4 Voltage between them and high voltage arm resistance R 4 And low voltage arm resistor R 5 Voltage between them.
7. The direct-current voltage superposition surge voltage testing circuit with protection device according to claim 1, wherein said isolation device DS comprises an isolation switch and a grounding switch for grounding one side of the isolation switch.
8. The direct-current voltage superposition surge voltage test circuit with the protection device according to claim 7, wherein the isolating switch comprises a wiring board I (1), a wiring board II (2), a first insulator (3), a moving contact (4), a fixed contact (5), a switch base (6), a vertical connecting rod (7), an operating mechanism box (9) and a second insulator (10), the wiring board I (1) is used as a No. 1 point of the isolating device DS, the wiring board II (2) is used as a No. 2 point of the isolating device DS, the wiring board I (1) is connected with the moving contact (4), the wiring board II (2) is connected with the fixed contact (5), the upper ends of the first insulator (3) and the second insulator (10) are respectively connected with the moving contact (4) and the fixed contact (5), the lower end of the first insulator (3) is fixedly connected with the switch base (6), the lower end of the vertical connecting rod (7) is arranged on the upper surface of the operating mechanism box (9), and the vertical connecting rod (7) can drive the moving contact (4) to be in contact with or disconnected under the control of the operating mechanism box (9).
9. The direct-current voltage superposition impulse voltage test circuit with the protection device according to claim 7, wherein the grounding switch comprises a grounding knife mechanism (8), a grounding knife connecting rod (11) and a grounding knife (12), the grounding knife mechanism (8) is arranged at the lower part of the switch base (6), the grounding knife mechanism (8) is positioned on the side face of the operating mechanism box (9), the grounding knife connecting rod (11) and the grounding knife (12) are assembled at the upper end part of the switch base (6), and in use, the grounding knife mechanism (8) can drive the grounding knife connecting rod (11) to further drive the grounding knife (12) to be in contact with or disconnected from the fixed contact (5).
10. A direct voltage superposition surge voltage testing circuit with protection device according to claim 9, wherein said ground knife mechanism (8) is grounded, the ground knife mechanism (8) being operated by an operating mechanism box (9).
Priority Applications (1)
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