CN214626350U

CN214626350U - Low residual voltage bus protector

Info

Publication number: CN214626350U
Application number: CN202120769526.1U
Authority: CN
Inventors: 单章
Original assignee: Anhui Giant Forest Electric Co ltd
Current assignee: Anhui Giant Forest Electric Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-11-05
Anticipated expiration: 2031-04-15

Abstract

The utility model provides a low residual voltage bus protection device, which comprises a machine body, wherein the machine body is divided into an external connection structure and an internal circuit structure, and the internal circuit structure comprises a low residual voltage protector connected with a high-voltage current-limiting fuse, the device can eliminate various overvoltage of the system, the protective residual voltage is lower than that of a conventional lightning arrester, and the overvoltage protection level of the system is effectively improved; and when the single-phase earth fault of the system is eliminated, the impact charging current passing through the PT can be effectively limited, the safety problems of the PT and the fuse are protected, and meanwhile, the device has the advantages of wide application range, convenience in operation and the like.

Description

Low residual voltage bus protector

Technical Field

The utility model relates to a circuit protection field especially relates to low residual voltage generating line protection device.

Background

The 3-35kV system in China has several overvoltage such as operation overvoltage generated in the opening and closing action process of a circuit breaker, arc overvoltage generated in single-phase grounding, atmospheric overvoltage and resonance overvoltage generated in lightning stroke and the like. In the future, no complete protection scheme aiming at the overvoltage exists, and accidents such as cable blasting, motor insulation breakdown, lightning arrester explosion, voltage transformer burnout and the like often occur. The reasons for such accidents, in addition to being related to the performance of the overvoltage protection products installed in the system, the complexity of the system itself has a significant impact on the overvoltage. For different systems, the overvoltage protection product needs to be used by considering the type of the transmission line of the system, the network structure of the transmission and distribution line, the nature of the load, the grounding mode of the system and the like. The rapid development of the modern power industry places new requirements on insulation coordination and overvoltage protection. On the one hand, environmental pollution is becoming more and more serious, climatic conditions are worsening, and the design of the switch cabinet is becoming more and more miniaturized. The probability of insulation flashover tripping and electricity interference is higher and higher no matter on a line or in a switch cabinet, and the problems are particularly prominent in special industries such as petroleum, chemical engineering, metallurgy, steel and the like. On the other hand, a large amount of solid insulation equipment and materials, particularly the extensive application of the XLPE power cable, cause the frequent occurrence of insulation accidents and greatly influence the service life of the solid insulation due to the cumulative damage of overvoltage to the solid insulation. Due to the reasons, the protection performance of the arrester in the traditional design is not ideal enough, and the arrester is required to provide a better protection effect, namely, the protection residual voltage of the arrester is reduced so as to greatly reduce the probability of insulation flashover and electricity interference, better protect solid insulation equipment, prolong the service life of the solid insulation equipment and improve the reliability of system operation.

With the rapid increase of the user system capacitance current, the PT failure rate is also in an increasing trend. In a PT cabinet, a primary winding of an electromagnetic voltage transformer for insulation monitoring is connected into a star shape, and a neutral point is grounded. When some operation is performed or after the ground fault disappears, the excitation impedance of the PT and the ground capacitance of the system form a nonlinear resonance loop. Due to the difference of loop parameters and external excitation conditions, high-frequency, smooth and frequency-division resonance overvoltage can be caused, and the system frequently breaks down. When the single-phase earth fault disappears, the energy released by the system capacitance current through the PT neutral point causes the PT fuse and the primary winding to flow a large low-frequency oscillation current. The conditions can cause the PT fuse wire to be blown out, and in severe cases, the PT is burnt, so that the safe operation of the power grid is influenced. Since PT faults occur frequently, the operating regulations of the power system put explicit requirements on PT fault protection. National nets, south nets, various local industries and the like require key protection in anti-accident measures. Besides controlling the manufacturing quality of the PT, the protection measure of PT faults is mainly to add various primary harmonic elimination or secondary harmonic elimination devices. These measures are generally used individually, each with its advantages and limitations, and do not form a comprehensive solution with complementary advantages.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low residual voltage generating line protection device to solve above-mentioned technical problem.

The utility model discloses a solve above-mentioned technical problem, adopt following technical scheme to realize:

low residual voltage bus protection device, including the organism, the organism divide into external connection structure and inner circuit structure, and inner circuit structure is including the low residual voltage protector who is connected with high-pressure current-limiting fuse.

Preferably, the external connection structure is including device controller, electrified display, the condensation controller, the pilot lamp, the wall bushing, auxiliary switch, the electromagnetic lock, operation structure, observation window and device data plate, wherein the front end at the organism is fixed to the device controller, and electrified display, the condensation controller, pilot lamp horizontal distribution to the front end of organism, the wall bushing is located the side of organism simultaneously, the front end fixedly connected with auxiliary switch of organism, the electromagnetic lock, the observation window, the device data plate, and auxiliary switch's one end fixedly connected with operation structure.

Preferably, the device controller, the electrified display, the condensation controller and the indicator light are electrically connected with each other, and the indicator light is divided into an abnormal state mode and a normal operation mode.

Preferably, a wall bushing is connected to a side end of the machine body and is horizontally distributed, and one end of the wall bushing penetrates into the machine body.

Preferably, the internal circuit structure is including support insulator, high voltage isolator, high voltage current limiting fuse, low residual voltage protector, ground bar, harmonic elimination ware, high pressure sensor, high voltage fuse and voltage transformer, and wherein the support insulator is located inner wall one side of organism, and support insulator and high voltage isolator's input fixed connection, and high voltage isolator's output is connected with high voltage current limiting fuse, high voltage current limiting fuse and low residual voltage protector fixed connection, the inner wall department fixedly connected with ground bar of organism, harmonic elimination ware and voltage transformer once, and voltage transformer and high voltage sensor's output fixed connection, high voltage sensor's output and high voltage fuse fixed connection, high voltage fuse and high voltage isolator's output fixed connection.

Preferably, the support insulator is provided with three and three support insulators all with high voltage isolator's input fixed connection, and support insulator is female arranging for giving first place to simultaneously.

The utility model has the advantages that:

the device can eliminate various overvoltage of the system, has lower protection residual voltage than a conventional lightning arrester, and effectively improves the overvoltage protection level of the system; and when the single-phase earth fault of the system is eliminated, the impact charging current passing through the PT can be effectively limited, the safety problems of the PT and the fuse are protected, and meanwhile, the device has the advantages of wide application range, convenience in operation and the like.

Drawings

Fig. 1 is a schematic front view of the low residual voltage bus protection device of the present invention;

FIG. 2 is a schematic diagram of a side view structure of the low residual voltage bus bar protection device of the present invention;

FIG. 3 is a schematic diagram of the low residual voltage bus protection device of the present invention;

reference numerals: 1. a device controller; 2. a charged display; 3. a condensation controller; 4. an indicator light; 5. a wall bushing; 6. an auxiliary switch; 7. an electromagnetic lock; 8. an operating structure; 9. an observation window; 10. installing a nameplate; 11. a support insulator; 12. a high voltage isolation switch; 13. a high voltage current limiting fuse; 14. a low residual voltage protector; 15. a ground bar; 16. a first harmonic eliminator; 17. a high pressure sensor; 18. a high voltage fuse; 19. a voltage transformer; 20. a body.

Detailed Description

Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1

As shown in fig. 1-3, the low residual voltage bus protection device includes a body 20, the body 20 is divided into an external connection structure and an internal circuit structure, and the internal circuit structure includes a low residual voltage protector 14 connected to a high voltage current limiting fuse 13, the external connection structure includes a device controller 1, an electrified display 2, a condensation controller 3, an indicator lamp 4, a wall bushing 5, an auxiliary switch 6, an electromagnetic lock 7, an operation structure 8, an observation window 9 and a device nameplate 10, wherein the device controller 1 is fixed at a front end of the body 20, the electrified display 2, the condensation controller 3 and the indicator lamp 4 are horizontally distributed at the front end of the body 20, the wall bushing 5 is located at a side end of the body 20, the front end of the body 20 is fixedly connected with the auxiliary switch 6, the electromagnetic lock 7, the observation window 9 and the device nameplate 10, and one end of the auxiliary switch 6 is fixedly connected with the operation structure 8, the internal circuit structure comprises a supporting insulator 11, a high-voltage isolating switch 12, a high-voltage current-limiting fuse 13, a low residual voltage protector 14, a grounding bar 15, a primary harmonic eliminator 16, a high-voltage sensor 17, a high-voltage fuse 18 and a voltage transformer 19, wherein the supporting insulator 11 is positioned on one side of the inner wall of the machine body 20, the supporting insulator 11 is fixedly connected with the input end of the high-voltage isolating switch 12, the output end of the high-voltage isolating switch 12 is connected with a high-voltage current-limiting fuse 13, the high-voltage current-limiting fuse 13 is fixedly connected with a low residual voltage protector 14, the inner wall of the machine body 20 is fixedly connected with a grounding bar 15, a primary resonance eliminator 16 and a voltage transformer 19, and the voltage transformer 19 is fixedly connected with the output end of the high-voltage sensor 17, the output end of the high-voltage sensor 17 is fixedly connected with the high-voltage fuse 18, and the high-voltage fuse 18 is fixedly connected with the output end of the high-voltage isolating switch 12.

The invention can inhibit the peak of overvoltage, the device adopts the zinc oxide valve plate of high-capacity dynamic resistance, can reduce the residual voltage value to a great extent, and can eliminate a great deal of energy generated when the system is in overvoltage, thus effectively ensuring the self-safety of the device, and adopts the special technology, thus being capable of eliminating the lightning overvoltage, arc overvoltage, operation overvoltage, resonance overvoltage, disconnection overvoltage and the like in the system at the same time.

Claims

1. Low residual voltage bus protection device, including organism (20), its characterized in that: organism (20) divide into external connection structure and internal circuit structure, and internal circuit structure is including low residual voltage protector (14) be connected with high-pressure current-limiting fuse (13), external connection structure is including device controller (1), electrified display (2), condensation controller (3), pilot lamp (4), wall bushing (5), auxiliary switch (6), electromagnetic lock (7), operation structure (8), observation window (9) and device data plate (10), wherein device controller (1) is fixed at the front end of organism (20), and electrified display (2), condensation controller (3), pilot lamp (4) horizontal distribution to the front end of organism (20), simultaneously wall bushing (5) are located the side of organism (20), the front end fixedly connected with auxiliary switch (6) of organism (20), electromagnetic lock (7), An observation window (9), a nameplate (10) and an operation structure (8) fixedly connected with one end of the auxiliary switch (6).

2. The low residual voltage bus bar protection device according to claim 1, wherein: the device is characterized in that the device controller (1), the electrified display (2), the condensation controller (3) and the indicator lamp (4) are electrically connected with one another, and the indicator lamp (4) is divided into an abnormal state mode and a normal operation mode.

3. The low residual voltage bus bar protection device according to claim 1, wherein: the side end of the machine body (20) is connected with a wall bushing (5) which is horizontally distributed, and one end of the wall bushing (5) penetrates into the machine body (20).

4. The low residual voltage bus bar protection device according to claim 1, wherein: the internal circuit structure comprises a supporting insulator (11), a high-voltage isolating switch (12), a high-voltage current-limiting fuse (13), a low residual voltage protector (14), a grounding bar (15), a primary harmonic eliminator (16), a high-voltage sensor (17), a high-voltage fuse (18) and a voltage transformer (19), wherein the supporting insulator (11) is positioned on one side of the inner wall of a machine body (20), the supporting insulator (11) is fixedly connected with the input end of the high-voltage isolating switch (12), the output end of the high-voltage isolating switch (12) is connected with the high-voltage current-limiting fuse (13), the high-voltage current-limiting fuse (13) is fixedly connected with the low residual voltage protector (14), the grounding bar (15), the primary harmonic eliminator (16) and the voltage transformer (19) are fixedly connected with the inner wall of the machine body (20), and the voltage transformer (19) is fixedly connected with the output end of the high-voltage sensor (17), the output end of the high-voltage sensor (17) is fixedly connected with a high-voltage fuse (18), and the high-voltage fuse (18) is fixedly connected with the output end of the high-voltage isolating switch (12).

5. The low residual voltage bus bar protection device according to claim 4, wherein: the support insulator (11) is provided with three and three support insulator (11) and all with high voltage isolator's (12) input fixed connection, support insulator (11) are the main bus bar simultaneously.