High-capacity high-voltage pulse direct current generator

Abstract

The utility model belongs to the technical field of high-voltage test equipment, and particularly relates to a high-capacity high-voltage pulse direct-current generator, which comprises a power supply, the power supply is connected with the input side of a voltage regulator through a disconnecting link and a fuse, and the output side of the voltage regulator is connected with the low-voltage side of a boosting transformer. A live wire port of the high-voltage side of the boosting transformer is connected with an anode of the high-voltage rectification silicon stack, a cathode of the high-voltage rectification silicon stack is connected with an anode of the discharge gap ball, a cathode of the discharge gap ball is connected with an anode of a tested device, and a cathode of the tested device is connected with a null line port of the high-voltage side of the boosting transformer. A high-voltage capacitor is connected in parallel between the positive electrode of the discharge gap ball and the negative electrode of the tested equipment, and the high-capacity capacitor unit is formed by connecting two capacitors in parallel, so that compared with the direct purchase of a high-capacity capacitor, not only is the equipment cost reduced, but also the capacity of the capacitor is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high pressure test equipment technical field, concretely relates to a large capacity high pressure pulse DC generator. BACKGROUND

[0002] In the 6kv transformer substation of a chemical plant of our group, about 60000kwh load is provided by the power supply of buried cable, and the load mainly includes various types of motors, transformers and electric fields. The equipment of our group is complex, and there is equipment vibration and machine running sound. The cables in the factory area are mostly buried cables. Once the buried cable fails, it is often difficult to locate the fault point. The detection and measurement method of cable fault mainly depends on the nature of the fault, so the detection work should start from determining the nature of the fault. It is necessary to determine whether the fault resistance is high or low, whether it is flashover or closed fault, whether it is grounding, short circuit, broken line or mixed, whether it is single phase, two phase or three phase fault. For the above situation, the general high voltage DC generator has small capacity and small discharge sound, and there are various noises in the factory area, so it is extremely difficult to locate the fault point, which is time-consuming and laborious, and the continuous production requirement of chemical equipment production is particularly high, which seriously affects the production. In the process of cable fault detection, high resistance grounding fault often occurs, which makes it difficult to measure the fault point and makes it more difficult to determine the fault location. Negative polarity voltage must be used during DC burn-through, because positive polarity voltage will cause water evaporation in the medium, which will dry out the fault point, resulting in an increase in the insulation resistance of the fault point, thereby reducing the burn-through speed. The rated current of the high voltage DC generator produced on the market is mostly in the mA (milliampere) level, and the rated capacity is several hundred W (watt). The current and capacity are too small, and it is time-consuming and laborious to burn the fault point. Finally, it may not be able to achieve low resistance burn. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a large capacity high pressure pulse DC generator for the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A large capacity high pressure pulse DC generator, comprising a power supply, the power supply is connected with the input side of the voltage regulator through the knife gate and the fuse, the output side of the voltage regulator is connected with the low voltage side of the step-up transformer, the fire line port of the high voltage side of the step-up transformer is connected with the anode of the high voltage rectifier silicon pile, the cathode of the high voltage rectifier silicon pile is connected with the positive electrode of the discharge gap ball, the negative electrode of the discharge gap ball is connected with the positive electrode of the measured equipment, and the negative electrode of the measured equipment is connected with the zero line port of the high voltage side of the step-up transformer. A high voltage capacitor is connected in parallel between the positive electrode of the discharge gap ball and the negative electrode of the measured equipment.

[0006] The high-voltage capacitor is composed of at least two groups of large-capacity capacitor units in series, and each large-capacity capacitor unit is composed of two capacitors in parallel.

[0007] Further, a current meter is connected in series between the live port on the output side of the voltage regulator and the live port on the low-voltage side of the step-up transformer, and a voltage meter is connected in parallel between the live port on the low-voltage side of the step-up transformer and the zero line port on the low-voltage side of the step-up transformer.

[0008] Still further, a contactor KM is arranged between the fuse and the voltage regulator, the coil of the contactor KM is connected in series with a reset switch SB2 and a power-on switch SB1, the normally open contact of the contactor KM is connected in parallel across the power-on switch SB1, and the contactor KM, the power-on switch SB1 and the reset switch SB2 jointly form a control loop for the voltage regulator.

[0009] Still further, one end of the A-phase coil and the C-phase coil on the low-voltage side of the step-up transformer is connected to the live port on the output side of the voltage regulator, the other end of the A-phase coil and the C-phase coil on the low-voltage side of the step-up transformer is connected to the zero line port on the output side of the voltage regulator, one end of the A-phase coil and the C-phase coil on the high-voltage side of the step-up transformer is connected to the anode of the high-voltage rectification silicon stack, and the other end of the A-phase coil and the C-phase coil on the high-voltage side of the step-up transformer is connected to the negative electrode of the device under test.

[0010] Still further, the discharge gap ball comprises a base, two insulating rods are symmetrically arranged on the left and right sides of the base, an adjusting bolt is threadedly connected to the insulating rod, and a discharge ball is fixedly arranged on the inner side of the adjusting bolt.

[0011] Still further, a plurality of universal wheels are arranged at the bottom of the step-up transformer to facilitate the movement of the step-up transformer.

[0012] Still further, the contactor KM and the voltage regulator are arranged in the interior of a protective shell, the power-on switch SB1 and the reset switch SB2 are arranged on the upper surface of the protective shell, and a plurality of universal wheels are arranged on the lower surface of the protective shell to facilitate the movement of the voltage regulator.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The large-capacity capacitor unit is composed of two capacitors in parallel, which not only reduces the equipment cost, but also significantly improves the capacity of the capacitor, and meanwhile, the A-phase and the C-phase of the step-up transformer are connected in parallel in the utility model, thereby further improving the overall capacity of the equipment; the capacity of the equipment is improved through the above two methods, thereby increasing the discharge sound of the discharge gap ball, which is helpful for locating the fault point.

[0015] The utility model discantly sets control loop for voltage regulator, further realizes the safety protection to operating personnel.

[0016] The utility model can adjust the distance between two clearance balls through adjusting bolt, and the middle part is directly connected without clearance. This operation can burn through the fault point of cable. When the current on the measured equipment is 1-2A, the stable output realizes the function of burning the high resistance fault point of cable to low resistance. It realizes one machine with two functions, which can be used for clearance discharge when locating the fault point of cable by flashover method, and can also realize the function of burning the high resistance fault point of cable to low resistance when it is difficult to locate the high resistance fault point of cable, which provides favorable conditions for the next step of locating the fault point. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is the circuit diagram of the utility model;

[0018] Fig. 2 It is the structure diagram of discharge clearance ball of the utility model;

[0019] Fig. 3 It is the installation diagram of voltage regulator and protective shell of the utility model;

[0020] In the drawing, power supply 1, knife gap 2, fuse 3, voltage regulator 4, step-up transformer 5, high voltage rectifier silicon pile 6, discharge clearance ball 7, measured equipment 8, high voltage capacitor 9, ammeter 10, voltmeter 11, protective shell 12, universal wheel 13, base 701, insulating rod 702, adjusting bolt 703, discharge ball 704. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical scheme of the utility model, the utility model is further illustrated through examples below.

[0022] For example, Figs. 1 to 3As shown, a large-capacity high-voltage pulse DC generator includes a power supply 1 connected to the input side of a voltage regulator 4 through a knife switch 2 and a fuse 3, a contactor KM provided between the fuse 3 and the voltage regulator 4, the coil of the contactor KM connected in series with a reset switch SB2 and a power-on switch SB1, the normally open contact of the contactor KM connected in parallel across the power-on switch SB1, the contactor KM, the power-on switch SB1 and the reset switch SB2 together forming a control loop for the voltage regulator 4, one end of the A-phase coil and the C-phase coil of the low-voltage side of a step-up transformer 5 connected to the firewire port of the output side of the voltage regulator 4, the other end of the A-phase coil and the C-phase coil of the low-voltage side of the step-up transformer 5 connected to the zero line port of the output side of the voltage regulator 4, one end of the A-phase coil and the C-phase coil of the high-voltage side of the step-up transformer 5 connected to the anode of a high-voltage rectifier silicon stack 6, the cathode of the high-voltage rectifier silicon stack 6 connected to the positive electrode of a discharge gap ball 7, the negative electrode of the discharge gap ball 7 connected to the positive electrode of a device under test 8, the other end of the A-phase coil and the C-phase coil of the high-voltage side of the step-up transformer 5 connected to the negative electrode of the device under test 8, a high-voltage capacitor 9 connected in parallel between the positive electrode of the discharge gap ball 7 and the negative electrode of the device under test 8, an ammeter 10 connected in series between the firewire port of the output side of the voltage regulator 4 and the firewire port of the low-voltage side of the step-up transformer 5, and a voltmeter 11 connected in parallel between the firewire port of the low-voltage side of the step-up transformer 5 and the zero line port of the low-voltage side of the step-up transformer 5.

[0023] The high-voltage capacitor 9 is composed of at least two groups of large-capacity capacitor units connected in series, and each large-capacity capacitor unit is composed of two capacitors connected in parallel.

[0024] The discharge gap ball 7 includes a base 701, two insulating rods 702 symmetrically arranged on the left and right sides of the base 701, an adjusting bolt 703 threadedly connected to the insulating rods 702, and a discharge ball 704 fixedly arranged on the inner side of the adjusting bolt 703.

[0025] A plurality of universal wheels 13 are arranged at the bottom of the step-up transformer 5 to facilitate the movement of the step-up transformer 5, the contactor KM and the voltage regulator 4 are arranged inside a protective housing 12, the power-on switch SB1 and the reset switch SB2 are arranged on the upper surface of the protective housing 12, and a plurality of universal wheels 13 are arranged on the lower surface of the protective housing 12 to facilitate the movement of the voltage regulator 4.

[0026] The main features and advantages of the present application are shown and described above, for those skilled in the art, it is clear that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0027] In addition, it should be understood that, although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A high-capacity high-voltage pulsed DC generator, characterized in that: The power supply (1) is connected with the input side of the voltage regulator (4) through the knife switch (2) and the fuse (3), the output side of the voltage regulator (4) is connected with the low voltage side of the step-up transformer (5), the live port of the high voltage side of the step-up transformer (5) is connected with the anode of the high voltage rectifier silicon stack (6), the cathode of the high voltage rectifier silicon stack (6) is connected with the positive electrode of the discharge gap ball (7), the negative electrode of the discharge gap ball (7) is connected with the positive electrode of the measured device (8), the negative electrode of the measured device (8) is connected with the zero line port of the high voltage side of the step-up transformer (5), and the high voltage capacitor (9) is connected in parallel between the positive electrode of the discharge gap ball (7) and the negative electrode of the measured device (8). The high voltage capacitor (9) is composed of at least two groups of large-capacity capacitor units connected in series, and each large-capacity capacitor unit is composed of two capacitors connected in parallel.

2. A high-power pulsed DC generator according to claim 1, characterized in that: The ammeter (10) is connected in series between the live port of the output side of the voltage regulator (4) and the live port of the low voltage side of the step-up transformer (5), and the voltmeter (11) is connected in parallel between the live port of the low voltage side of the step-up transformer (5) and the zero line port of the low voltage side of the step-up transformer (5).

3. A high-power pulsed DC generator according to claim 1, characterized in that: The contactor KM is arranged between the fuse (3) and the voltage regulator (4), the coil of the contactor KM is connected in series with the reset switch SB2 and the power-on switch SB1, the normally open contact of the contactor KM is connected in parallel across the power-on switch SB1, and the contactor KM, the power-on switch SB1 and the reset switch SB2 together constitute a control circuit for the voltage regulator (4).

4. A high-power pulsed DC generator according to claim 1, characterized in that: One end of the A-phase coil and the C-phase coil of the low voltage side of the step-up transformer (5) is connected with the live port of the output side of the voltage regulator (4), the other end of the A-phase coil and the C-phase coil of the low voltage side of the step-up transformer (5) is connected with the zero line port of the output side of the voltage regulator (4), one end of the A-phase coil and the C-phase coil of the high voltage side of the step-up transformer (5) is connected with the anode of the high voltage rectifier silicon stack (6), and the other end of the A-phase coil and the C-phase coil of the high voltage side of the step-up transformer (5) is connected with the negative electrode of the measured device (8).

5. A high-power pulsed DC generator according to claim 1, characterized in that: The discharge gap ball (7) comprises a base (701), two insulating rods (702) are symmetrically arranged on the left and right sides of the base (701), an adjusting bolt (703) is threadedly connected to the insulating rod (702), and a discharge ball (704) is fixedly arranged on the inner side of the adjusting bolt (703).

6. A high-power pulsed DC generator according to claim 1, characterized in that: A plurality of universal wheels (13) are arranged at the bottom of the step-up transformer (5) to facilitate the movement of the step-up transformer (5).

7. A high-power pulsed DC generator according to claim 3, characterized in that: The contactor KM and the voltage regulator (4) are arranged in the interior of the protection shell (12), the power-on switch SB1 and the reset switch SB2 are arranged on the upper surface of the protection shell (12), and a plurality of universal wheels (13) are arranged on the lower surface of the protection shell (12) to facilitate the movement of the voltage regulator (4).

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