Capacitor protection device

Abstract

The utility model discloses a capacitor protection device, and relates to the technical field of electronics. The problems that in the power taking and voltage dividing process, due to operation overvoltage or lightning overvoltage, internal partial discharge of a high-voltage ceramic capacitor and a low-voltage ceramic capacitor can be caused, a circuit breaks down, and operation of a power system is affected are solved. The input end of the first high-voltage capacitor is electrically connected with the output end of a high-voltage power grid, and the first high-voltage capacitor is used for performing first step-down on high-voltage power from the high-voltage power grid; the input end of the second high-voltage capacitor is electrically connected with the output end of the first high-voltage capacitor, and the second high-voltage capacitor is used for reducing the high voltage passing through the first high-voltage capacitor for the second time; the input end of the low-voltage capacitor is electrically connected with the output end of the second high-voltage capacitor, and the low-voltage capacitor is used for reducing the high voltage passing through the second high-voltage capacitor for the third time to obtain the voltage used by a voltmeter and rear-end test monitoring equipment; and the piezoresistor is arranged in parallel with each second high-voltage capacitor and each low-voltage capacitor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic technology, more particularly to a capacitor protection device. BACKGROUND

[0002] The ceramic capacitor is generally used in the power system or the military industry, and plays the roles of power taking, monitoring, metering, voltage dividing, energy storage and the like. The equivalent circuit diagram of the existing ceramic capacitor for power taking and metering in the power system is shown in FIG. 1, wherein, Figure 1 and Figure 2 As shown in FIG. 1, in the A, B and C three-circuit, the high voltage from the state grid is converted into 10KV voltage through the high-voltage ceramic capacitors C1, C2 and C3, and then is lowered to 380V or 220V through the high-voltage ceramic capacitors C ′ 1, C ′ 2 and C ′ 3, and the low voltage of 380V or 220V is lowered to 36V or below through the low-voltage ceramic capacitor C4, so that the voltage meter and the rear-end test monitoring equipment can be observed through the live display. Figure 1 As shown in FIG. 2, in the A, B and C three-circuit, the high voltage from the state grid is converted into 10KV voltage through the high-voltage ceramic capacitors C1, C2 and C3, and then is lowered to 380V or 220V through the high-voltage ceramic capacitors C ′ 1, C ′ 2 and C ′ 3, and the low voltage of 380V or 220V is lowered to 36V or below through the low-voltage ceramic capacitor, so that the voltage meter and the rear-end test monitoring equipment can be observed through the live display. Figure 2 As shown in FIG. 2, in the A, B and C three-circuit, the high voltage from the state grid is converted into 10KV voltage through the high-voltage ceramic capacitors C1, C2 and C3, and then is lowered to 380V or 220V through the high-voltage ceramic capacitors C ′ 1, C ′ 2 and C ′ 3, and the low voltage of 380V or 220V is lowered to 36V or below through the low-voltage ceramic capacitor, so that the voltage meter and the rear-end test monitoring equipment can be observed through the live display.

[0003] In actual application, if the voltage meter displays the set value of 36V or below, it indicates that the entire power system is in normal operation, and if the voltage meter is not equal to the set value, the circuit will alarm to indicate the circuit failure. However, if the operating overvoltage or lightning overvoltage exists in the circuit, the internal partial discharge of the high-voltage ceramic capacitor and the low-voltage ceramic capacitor will be caused, and finally the circuit failure, the burning of the high-voltage ceramic capacitor, the low-voltage ceramic capacitor and even the rear-end test monitoring equipment and the alarm equipment will be caused, so that the alarm equipment is burned without alarm, which not only affects the operation of the entire power system, but also can cause significant economic loss. SUMMARY

[0004] The capacitor protection device provided by the embodiment of the present application can solve the problem that the internal partial discharge of the high-voltage ceramic capacitor and the low-voltage ceramic capacitor is caused due to the operating overvoltage or lightning overvoltage in the power taking and voltage dividing process, and the circuit failure, the burning of the high-voltage ceramic capacitor, the low-voltage ceramic capacitor and even the rear-end test monitoring equipment and the alarm equipment are caused, which not only affects the operation of the entire power system, but also can cause significant economic loss.

[0005] The capacitor protection device provided by the embodiment of the present application can solve the problem that the internal partial discharge of the high-voltage ceramic capacitor and the low-voltage ceramic capacitor is caused due to the operating overvoltage or lightning overvoltage in the power taking and voltage dividing process, and the circuit failure, the burning of the high-voltage ceramic capacitor, the low-voltage ceramic capacitor and even the rear-end test monitoring equipment and the alarm equipment are caused, which not only affects the operation of the entire power system, but also can cause significant economic loss.

[0006] a first high-voltage capacitor, an input end of which is electrically connected with an output end of the high-voltage power grid, for performing first voltage reduction on high-voltage power from the high-voltage power grid;

[0007] a second high-voltage capacitor, an input end of which is electrically connected with an output end of the first high-voltage capacitor, for performing second voltage reduction on high-voltage power passing through the first high-voltage capacitor;

[0008] a low-voltage capacitor, an input end of which is electrically connected with an output end of the second high-voltage capacitor, for performing third voltage reduction on high-voltage power passing through the second high-voltage capacitor, so as to obtain voltage for use by a power supply and a back-end test monitoring device;

[0009] a voltage-dependent resistor, which is arranged in parallel with each of the second high-voltage capacitor and each of the low-voltage capacitor.

[0010] Preferably, the number of the first high-voltage capacitor includes a plurality, and the plurality of the first high-voltage capacitor is arranged in parallel, and an input end of each of the plurality of the first high-voltage capacitor is electrically connected with an output end of the high-voltage power grid.

[0011] Preferably, the number of the second high-voltage capacitor includes a plurality, and one voltage-dependent resistor is arranged in parallel with each of the second high-voltage capacitor,

[0012] An input end of a branch formed by the voltage-dependent resistor and the second high-voltage capacitor is electrically connected with an output end of the first high-voltage capacitor.

[0013] Preferably, an input end of a branch formed by the low-voltage capacitor and the voltage-dependent resistor is electrically connected with an output end of the second high-voltage capacitor.

[0014] The embodiment of the present application provides a capacitor protection device, which comprises: a first high-voltage capacitor, an input end of which is electrically connected with an output end of a high-voltage power grid, and which is used for performing first voltage reduction on high-voltage power from the high-voltage power grid; a second high-voltage capacitor, an input end of which is electrically connected with an output end of the first high-voltage capacitor, and which is used for performing second voltage reduction on high-voltage power passing through the first high-voltage capacitor; a low-voltage capacitor, an input end of which is electrically connected with an output end of the second high-voltage capacitor, and which is used for performing third voltage reduction on high-voltage power passing through the second high-voltage capacitor, so as to obtain voltage for a voltage table and a back-end test monitoring device; and a voltage-dependent resistor, which is arranged in parallel with each of the second high-voltage capacitor and the low-voltage capacitor. In the protection device, the voltage-dependent resistor is arranged in parallel with the first high-voltage ceramic capacitor, the second high-voltage ceramic capacitor and the low-voltage capacitor in a circuit. In the case that overvoltage occurs in the circuit, the voltage-dependent resistor plays a role in protecting the first high-voltage capacitor, the second high-voltage capacitor, the low-voltage capacitor, the back-end test monitoring device and an alarm device. The problem that high-voltage ceramic capacitors and low-voltage ceramic capacitors are internally partially discharged and circuit failure is caused when overvoltage caused by operation or lightning occurs in the process of taking power and dividing voltage, thereby affecting power system operation, is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 A circuit schematic diagram of a power taking and monitoring device without protection provided in the prior art;

[0017] Figure 2 Another circuit schematic diagram of a power taking and monitoring device without protection provided in the prior art;

[0018] Figure 3 A capacitor protection circuit schematic diagram provided by the embodiment of the present application;

[0019] Figure 4 Another capacitor protection circuit schematic diagram provided by the embodiment of the present application;

[0020] Figure 5 A power taking and monitoring device circuit schematic diagram with protection added provided by the embodiment of the present application.

[0021] Among them, the first high-voltage capacitor 101, the second high-voltage capacitor 201, the low-voltage capacitor 301, the voltage-dependent resistor 401, the first aviation plug 501, and the second aviation plug 502. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0023] Figure 3 A capacitor protection circuit schematic diagram provided by the embodiment of the present application is provided. Figure 4 Another capacitor protection circuit schematic diagram provided by the embodiment of the present application is provided. Figures 3-4 For example, the capacitor protection device provided by the embodiment of the present application is described in detail.

[0024] As shown in Figure 1 The capacitor protection device mainly comprises: a first high-voltage capacitor 101, a second high-voltage capacitor 201, a low-voltage capacitor 301, and a pressure-sensitive resistor 401.

[0025] Specifically, the input end of the first high-voltage capacitor is electrically connected with the output end of the high-voltage power grid, for performing first voltage reduction on high-voltage power from the high-voltage power grid; the input end of the second high-voltage capacitor is electrically connected with the output end of the first high-voltage capacitor, in actual application, when the number of the first high-voltage capacitor is 3, the number of the second high-voltage capacitor is also 3 correspondingly, and the input end of each second high-voltage capacitor is electrically connected with the output end of a first high-voltage capacitor respectively, since the first high-voltage capacitor performs first voltage reduction on input high-voltage, the second high-voltage capacitor correspondingly performs second voltage reduction on the input high-voltage which has been reduced once.

[0026] Further, the low-voltage capacitor is further included, in actual application, the first high-voltage capacitor and the second high-voltage capacitor are used for reducing the voltage of the input super-high-voltage, wherein the first high-voltage capacitor can convert high-voltage into 10KV voltage, and the second high-voltage capacitor can reduce high-voltage to 380V or 220V, in the embodiment of the present application, the low-voltage capacitor is used for reducing the low-voltage of 380V or 220V to below 36V after the first high-voltage capacitor and the second high-voltage capacitor, and the voltage below 36V is mainly used for a voltmeter and a back-end test monitoring device.

[0027] In the embodiment of the utility model, in order to avoid the problem that the high-voltage ceramic capacitor and the low-voltage ceramic capacitor will cause internal partial discharge, resulting in circuit failure and affecting power system operation when overvoltage or lightning overvoltage occurs during power supply voltage division. Preferably, a voltage-dependent resistor is arranged in parallel with each second high-voltage capacitor and low-voltage capacitor, and the overvoltage in the power supply voltage division circuit can be added to the voltage-dependent resistor through the instantaneous start of the voltage-dependent resistor, thereby avoiding the problem of internal discharge of the second high-voltage capacitor and the low-voltage capacitor causing circuit failure.

[0028] Specifically, the voltage-dependent resistor is arranged in parallel with the second high-voltage capacitor to form a branch, one end of the branch is electrically connected with the output end of the first high-voltage capacitor, and the other end is electrically connected with the input end of the branch formed by the voltage-dependent resistor and the low-voltage capacitor.

[0029] For example, the capacitor protection device provided in the embodiment of the utility model comprises a plurality of first high-voltage capacitors; the plurality of first high-voltage capacitors are arranged in parallel, and the input ends thereof are electrically connected with the output end of the high-voltage power grid.

[0030] For example, the capacitor protection device provided in the embodiment of the utility model comprises a plurality of first high-voltage capacitors; the plurality of first high-voltage capacitors are arranged in parallel, and the input ends thereof are electrically connected with the output end of the high-voltage power grid.

[0031] Further, the input end of the branch formed by the low-voltage capacitor and the voltage-dependent resistor is electrically connected with the output end of the second high-voltage capacitor.

[0032] Figure 5 The power supply protection and monitoring device circuit schematic diagram provided in the embodiment of the utility model is as shown in Figure 5 As shown in the figure, three first high-voltage capacitors 101 are arranged on three circuits A, B and C, respectively, the output ends of the circuits A, B and C are electrically connected with three first aviation plugs 501, respectively, the output ends of the three first aviation plugs 501 are electrically connected with three second high-voltage capacitors 201, respectively, wherein the three second high-voltage capacitors form a branch in parallel with one voltage-dependent resistor 401, therefore, the output ends of the three first aviation plugs are electrically connected with one branch, respectively, further, the three branches are arranged in parallel, one side of the output ends thereof is electrically connected with the input end of a second aviation plug 502, and the other side is electrically connected with the input end of a branch formed in parallel by a low-voltage capacitor 301 and a voltage-dependent resistor 401.

[0033] It should be noted that in the above embodiment, the first high-voltage capacitor, the second high-voltage capacitor and the low-voltage capacitor can all be ceramic capacitors.

[0034] In summary, an embodiment of the present invention provides a capacitor protection device, comprising: a first high-voltage capacitor, whose input end is electrically connected to the output end of the high-voltage power grid, for performing a first voltage reduction on the high-voltage power from the high-voltage power grid; a second high-voltage capacitor, whose input end is electrically connected to the output end of the first high-voltage capacitor, for performing a second voltage reduction on the high-voltage power passing through the first high-voltage capacitor; a low-voltage capacitor, whose input end is electrically connected to the output end of the second high-voltage capacitor, for performing a third voltage reduction on the high-voltage power passing through the second high-voltage capacitor, to obtain a voltage for use by a voltmeter and back-end test and monitoring equipment; and a varistor, which is arranged in parallel with each of the second high-voltage capacitors and each of the low-voltage capacitors. In this protection device, the varistor is connected in parallel with the first high-voltage ceramic capacitor, the second high-voltage ceramic capacitor, and the low-voltage capacitor in the circuit, respectively. In the event of an overvoltage in the circuit, the varistor protects the first high-voltage capacitor, the second high-voltage ceramic capacitor, the low-voltage capacitor, the back-end test and monitoring equipment, and the alarm device, thereby resolving the problem that partial discharge within the high-voltage ceramic capacitor and the low-voltage ceramic capacitor caused by operational overvoltage or lightning overvoltage during the power supply voltage division process can cause circuit failure and affect the operation of the power system.

[0035] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0036] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A capacitor protection device, characterized in that: include: a first high-voltage capacitor, an input end of which is electrically connected to an output end of the high-voltage grid, for performing a first voltage reduction on the high-voltage electricity from the high-voltage grid; a second high-voltage capacitor, whose input end is electrically connected to the output end of the first high-voltage capacitor, for performing a second voltage reduction on the high voltage passing through the first high-voltage capacitor; a low-voltage capacitor, whose input end is electrically connected to the output end of the second high-voltage capacitor, for reducing the high voltage passing through the second high-voltage capacitor for a third time to obtain a voltage for use by a voltmeter and a back-end test and monitoring device; A varistor is provided in parallel with each of the second high-voltage capacitors and each of the low-voltage capacitors.

2. The capacitor protection device according to claim 1, wherein: The number of the first high-voltage capacitors includes a plurality; A plurality of the first high-voltage capacitors are arranged in parallel, and input ends thereof are all electrically connected to the output end of the high-voltage power grid.

3. The capacitor protection device according to claim 1, wherein: The number of the second high-voltage capacitors includes a plurality, and each of the second high-voltage capacitors is provided with a varistor in parallel. An input end of a branch formed by the varistor and the second high-voltage capacitor is electrically connected to an output end of the first high-voltage capacitor.

4. The capacitor protection device according to claim 1, wherein: An input end of a branch formed by the low-voltage capacitor and the varistor is electrically connected to an output end of the second high-voltage capacitor.

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