CN205195071U - Novel low pressure rural power grids switch board - Google Patents

Abstract

The utility model provides a dedicated novel rural power grids switch board of rural power grids. The utility model discloses a cabinet body, electrical component two parts, the front panel is equipped with in the front of the cabinet body, and to be instrument door, operation protection panel, preceding panel triplex down in proper order, the rear panel is installed at the back to the cabinet body on follow, and the panel hinged on the cabinet is personally experienced sth. Part of the body under to down in proper order for fixed shrouding, back panel down, fixed shrouding is opened had the observation window on follow after, the roof is equipped with at cabinet body top, and the roof board is provided with a plurality of cable entrance holes, and the bottom plate is installed to cabinet body bottom, and the bottom plate is equipped with a plurality of cable outlet. The utility model discloses a cabinet height degree and volume, weight reduction are compressed in the redesign and the optimization of structure, be convenient for transportation and transport, and the interior space utilization of improvement cabinet, through addding viewing device, the fortune of being convenient for dimension is observed, and operational structure or warning marker is prevented missing in the increase, improves the security, through increasing fixed class of device of inlet wire installation of cable, easy to assemble and use.

Description

A New Type of Low-Voltage Rural Power Distribution Cabinet

technical field

The utility model relates to a low-voltage power distribution cabinet, in particular to a novel rural power distribution cabinet.

Background technique

At present, in the power system, low-voltage rural power distribution cabinets mostly adopt traditional cabinet types such as GGD and PGL. Since the above-mentioned traditional cabinet types are mostly general-purpose cabinet types, there are many shortcomings when used as rural power distribution cabinets. Because the original cabinet-type cabinet is tall and heavy, and the space of the rural power distribution room is relatively small, large tools such as cranes cannot be used, and transportation and installation are more difficult. Moreover, the observation window of the cabinet is relatively high, which is inconvenient to observe the situation inside the cabinet. The bottom of the cabinet is designed with a fixed baffle, which is inconvenient for personnel to construct. The space inside the cabinet is large but there are fewer components installed, and the space utilization rate is low. There is no anti-misoperation mechanism or warning signs in the original cabinet type, which is not safe enough. The installation and fixation of the incoming cables are not fully considered during the design, and it is extremely inconvenient to install and fix the incoming cables in actual operation.

Contents of the invention

In order to provide a new type of low-voltage rural power distribution cabinet dedicated to rural power grids, through structural redesign and optimization, the height and volume of the cabinet body are reduced, and the weight is reduced, which is convenient for transportation and handling, facilitates on-site construction, and improves the utilization rate of the cabinet space. In addition, by adding an observation device, it is convenient for operation and maintenance observation, adding an anti-misoperation structure or warning signs to improve safety, and adding installation and fixing devices for incoming cables to facilitate installation and use.

In order to achieve the above object, the technical solution adopted by the utility model is:

A new type of low-voltage rural power distribution cabinet, including two parts: the cabinet body and electrical components. The front panel of the cabinet body is equipped with a front panel. Hinged on the cabinet body, the instrument door is equipped with instruments and indicator lights, the operation protection panel has a valve-type locking mechanism, and the front lower panel is hinged with the cabinet body;

There is a rear panel installed on the back of the cabinet, from top to bottom there are fixed sealing plate and rear lower panel. The fixed sealing plate has an observation window, and the rear lower panel is hinged on the cabinet body;

The top of the cabinet is equipped with a top plate, which is provided with multiple cable entry holes, and the bottom of the cabinet is equipped with a bottom plate, which is provided with multiple cable exit holes.

According to the new low-voltage rural power distribution cabinet, the operation protection panel and the fixed sealing plate are respectively affixed with warning signs, and the middle part of the fixed sealing plate is provided with a rectangular observation window sealed with a transparent cover.

According to the new low-voltage rural power distribution cabinet, one side of the front and rear open panels is hinged to the cabinet body through a hinge, and the other side is equipped with a lock.

According to the new type of low-voltage rural power distribution cabinet, the top plate is provided with a cable inlet hole for each phase cable to enter separately. Corresponding number of cable outlets.

The valve-type locking mechanism is composed of a guide groove, a valve baffle, and a locking coil. The guide groove is welded on the operation protection panel, the locking coil is fixed on the guide groove, the valve baffle is installed in the guide groove, the locking shaft of the locking coil is stuck on the upper part of the valve baffle, and the power supply of the locking coil is drawn from the lower port of the circuit breaker.

According to the new low-voltage rural power distribution cabinet, the electrical components in the distribution cabinet include isolating switches, circuit breakers, transformers, fuses, and lightning arresters.

The isolating switch is connected to the upper port of the circuit breaker through the conductor equipped with the transformer, and the neutral line is directly connected to the circuit breaker from the upper port of the isolating switch through the conductor without passing through the isolating switch;

The lower port of the circuit breaker is connected to the fuse, and each phase line outlet of the fuse is connected to a lightning arrester, and the other end of the lightning arrester is connected together through a conductor, and then connected to the grounding point through a wire, and the zero line outlet terminal is not connected to the lightning arrester.

According to the new low-voltage rural power distribution cabinet, the instrument current loop is connected to the current transformer through wires, the voltage loop is connected to the voltage conversion switch through wires, the voltage conversion switch is connected to the secondary fuse, and the other end of the secondary fuse is connected to To each phase conductor, the indicator light is respectively connected to the outlet side of the fuse of phase A and phase C of each circuit through wires.

The new power distribution cabinet reduces the height of the traditional power distribution cabinet, reduces the volume, reduces the weight at the same time, facilitates the handling during construction, and reduces the consumption of manpower and material resources. Since the components in the cabinet remain unchanged, the cabinet body is reduced, which improves the utilization rate of the space in the cabinet. As the height is reduced, the instrument observation window and the operation knob are also lowered, which facilitates the operation and maintenance observation of the staff, and an observation window is set at the back, so that the staff can observe the situation inside the cabinet without opening the cabinet door, which further facilitates the work Operation and maintenance observation of personnel, and reduce the possibility of accidental electric shock. The operation protection panel is designed to be fixed, and the isolation switch lock procedure is added, and the correct operation process and eye-catching warning signs are posted to remind operators to operate in accordance with the correct operation process, which improves the safety of personnel and equipment, and improves The protection level of the cabinet is guaranteed to prevent the operator from accidentally touching and misoperating. The original fixed lower sealing plate is changed into a split panel, which increases the construction space of the lower part of the cabinet and facilitates the construction personnel's operation. The original cabinet top has only one incoming cable hole, and the cable cannot be fixed. Now it is changed to four cable holes for each phase cable to enter separately, and each hole is equipped with a screw-on cable retainer. The cables are fixed firmly and at the same time blocked to prevent foreign matter from entering the cabinet and improve the protection level.

Description of drawings

Fig. 1 is a front view of the utility model.

Fig. 2 is a top view of the utility model.

Fig. 3 is a rear view of the utility model.

Fig. 4 is a left view of the utility model.

Fig. 5 is a bottom view of the utility model.

Fig. 6 is the electrical schematic diagram of the utility model.

Fig. 7 The assembly diagram of the valve type locking mechanism.

Figure 8 is a diagram of the guide groove of the valve-type locking mechanism.

Figure 9 is a diagram of the valve baffle of the valve type locking mechanism.

In the attached picture:

1. Meter 2. Indicator light 3. Isolation switch 4. Warning sign

5. Circuit breaker 6. Lock 7. Fuse 8. Zero line outlet row

9. Front lower panel 10. Operation protection panel 11. Instrument door 12. Cabinet body

13. Observation window 14. Fixed sealing plate 15. Rear lower panel 16. Cable entry hole

17. Top plate 18. Cable outlet hole 19. Bottom plate 20. Grounding point

21. Secondary fuse 22. Current transformer 23. Lightning arrester 24. Valve type locking mechanism

25. Locking coil 26. Guide slot 27. Valve baffle.

detailed description

A new low-voltage rural power distribution cabinet includes two parts: a cabinet body 12 and electrical components, and the internal electrical components include an isolating switch 3 , a circuit breaker 5 , a transformer 22 , a fuse 7 , and a lightning arrester 23 .

The isolating switch 3 is respectively connected to the upper port of the circuit breaker 5 through a conductor, and a current transformer 22 is installed on the conductor. The lower port of the circuit breaker 5 is connected with the fuse 7 . The fuse 7 is not connected to the lightning arrester 23 except for the outgoing terminal of the neutral line, and the lightning arrester 23 is connected to each outgoing terminal of the other phase lines. The other ends of the lightning arrester 23 are connected together through a conductor, and then connected to the grounding point 20 through a wire.

Cabinet body 12 fronts are equipped with front panel, are divided into three parts, are instrument door 11, operation protection panel 10, front lower panel 9 successively from top to bottom. Instrument door 11 one side links to each other with cabinet body by hinge, and lockset 6 is equipped with on the other side, can open to one side by special tool. Meter 1 and indicator light 2 are housed on the meter door 11. Among them, the instrument current loop is connected to the current transformer 22 through wires, the voltage loop is connected to the voltage conversion switch through wires, the voltage conversion switch is connected to the secondary fuse 21, and the other end of the secondary fuse 21 is connected to each phase conductor, The indicator lights 2 are respectively connected to the outlet sides of the fuses of the two phases A and C of each circuit through wires.

Below the instrument door 11 is a fixed operation protection panel 10, which is equipped with a valve-type locking mechanism 24, and the correct operation process and eye-catching warning signs 4 are pasted on the bottom. Below the operation protection panel 10 is the front lower panel 9, which is respectively equipped with hinges to be connected with the cabinet body 12, and lockset 6 is installed, which can be opened to both sides by a special tool.

Back panel is equipped with in the back of cabinet body 12, is divided into two parts, is successively fixed sealing plate 14, rear lower panel 15 from top to bottom. Wherein the middle of the fixed sealing plate 14 is provided with a rectangular observation window 13, and a striking warning sign 4 is posted below it. Rear lower panel 15 is the same as front lower panel 9, links to each other with cabinet body hinge, and lockset 6 is housed, can open to both sides by special tool. A top plate 17 is installed on the top surface of the cabinet body 12, and a cable inlet hole 16 is provided on the top plate 17, and a screw-on cable retainer is provided. A base plate 19 is installed on the bottom surface of the cabinet body 12, and a corresponding number of cable outlet holes 18 are set according to the number of outlet switches.

The working principle of this power distribution cabinet is: the incoming cables A, B, and C are connected to the isolating switch 3, and the operating mechanism of the isolating switch 3 is located on the operation protection panel 10, which is closed or disconnected by manual control with special tools , but it cannot be used to break the current, it can only be used as an obvious disconnection point in the line.

The lower port of the isolating switch 3 is connected to the upper port of the circuit breaker 5 using a branch conductor, and the neutral line does not pass through the isolating switch 3, but is directly connected to the circuit breaker 5 by the incoming cable through the conductor. The current flows through the isolating switch 3 from the incoming cable, and flows to the circuit breaker 5 through the branch conductor. The circuit breaker 5 can break the current, open and close with load, and can be disconnected in case of leakage on the outgoing line side to prevent accidents. The three phases A, B, and C below the circuit breaker 5 correspond to a fuse 7, except for the neutral line, and are connected by conductors. The neutral line does not pass through the fuse 7, and is directly connected to the position of the fuse 7 by a conductor from the lower port of the circuit breaker 5 as the neutral line outlet bar 8. The current flows out through the circuit breaker 5, and the phase line current flows out to the outgoing cable through the fuse 7. The neutral line current flows directly from the circuit breaker 5 to the outgoing cable.

The fuse 7 can blow the fuse core when the current is too large to protect the circuit. The bottom of each fuse 7 corresponds to a lightning arrester 23, and one side of each lightning arrester 23 is connected to the outlet side of the fuse 7 through a conductor. The other grounding sides of all the lightning arresters 23 are connected together through conductors, and finally connected to the grounding point 20 . The lightning arrester 23 can be turned on when the outgoing line encounters a lightning strike and the voltage and current rise instantaneously, leading a large current to the grounding point 20 .

The current transformer 22 senses the current of each phase and transmits it to the meter 1 through the wire. The voltage conversion switch transfers the voltage obtained from the upper port of the isolating switch 3 to the voltage circuit of the instrument 1 in the form of the phase-to-phase voltage between each two phases, and the instrument 1 displays the voltage between each two phases. When the cable on the outlet side is energized, the corresponding indicator light 2 is on. In case of a power failure or fault, the outlet cable loses power, and the indicator light 2 goes out.

When all the circuit breakers 5 are in the opening state, the locking coil 25 is energized and closed, the valve baffle 27 of the valve type locking mechanism 24 can be pushed upward, the operating hole of the isolating switch 3 is opened, and the isolating switch 3 can be opened and closed. Operation, when any circuit breaker 5 is in the closed state, the blocking coil 25 loses power, the blocking shaft of the blocking coil 25 is stuck on the upper part of the valve baffle 27, the valve baffle 27 cannot be pushed upward, and the isolating switch 3 cannot be operated .

Example

The dimensions of the low-voltage rural power distribution cabinet are: width 1000mm, thickness 600mm, height 1800mm. The electrical system of this cabinet adopts the isolating switch model HD13BX-1000/311000A. The lower part of the isolating switch 3 is processed into a branch mode with a copper bar. The lower part is three circuit breakers, two of which are GM30L-400/H3NPE, and the model is GM6L. A circuit breaker for -250/H3NZE.

The A, B, and C phases below the circuit breaker, except for the neutral line, correspond to a fuse, and are connected by copper bars. The fuse model corresponding to the GM30L-400/H3NPE circuit breaker is HDLRT0-400/400A, and the fuse model corresponding to the GM6L-250/H3NZE circuit breaker is HDLRT0-400/250A. Below each fuse corresponds to a surge arrester, the model is HY1.5WS-0.28/1.3. Each lightning arrester is connected to the lower port of the fuse with a 6mm2 wire, and the other grounding side of all lightning arresters is connected through an aluminum row. grounding point.

Claims (7)

1. a New Low Voltage rural power grids power distribution cabinet, comprise cabinet (12), appliance component two parts, it is characterized in that: front panel is equipped with in the front of cabinet (12), be followed successively by instrument door (11), operation protection face board (10), front lower panel (9) three part from top to bottom, instrument door (11) is hinged on cabinet, instrument (1) and indicator light (2) instrument door (11) be equipped with, operation protection face board (10) is provided with shutter-type blocking mechanism (24), and front lower panel (9) is hinged with cabinet;

Cabinet (12) is equipped with rear board below, is followed successively by fixing shrouding (14), rear lower panel (15) from top to bottom, and fixing shrouding (14) is provided with observation window (13), and rear lower panel (15) is hinged on cabinet;

Top board (17) is equipped with at cabinet (12) top, and top board (17) is provided with multiple long cable section of ingoing line hole (16), and the base plate (19) of cabinet (12) bottom is provided with multiple cable outlet hole (18).

2. New Low Voltage rural power grids power distribution cabinet according to claim 1, is characterized in that: described operation protection face board (10), fixing shrouding (14) post alarming sign (4) respectively, and fixing shrouding (14) middle part is provided with observation window (13).

3. New Low Voltage rural power grids power distribution cabinet according to claim 1, is characterized in that: described instrument door (11) is one-sided to be connected with cabinet by hinge, and opposite side is equipped with lockset (6); Front lower panel (9) is opposite opened, is connected with cabinet by hinge, and is provided with lockset (6); Rear lower panel (15) is also opposite opened, is connected with cabinet by hinge, and is provided with lockset (6).

4. New Low Voltage rural power grids power distribution cabinet according to claim 1, it is characterized in that: described top board (17) is provided with the long cable section of ingoing line hole (16) of the independent inlet wire of every phase cable, long cable section of ingoing line hole (16) is furnished with screwing type cable guard ring, and base plate (19) is provided with the cable outlet hole (18) of outlet switch way respective amount.

5. New Low Voltage rural power grids power distribution cabinet according to claim 1, it is characterized in that: described shutter-type blocking mechanism (24) is made up of gathering sill (26), valve baffle plate (27), blocking coil (25), gathering sill (26) is welded in operation protection face board (10), blocking coil (25) is fixed on gathering sill (26), valve baffle plate (27) is arranged in gathering sill (26), and the latch shaft of blocking coil (25) is stuck in valve baffle plate (27) top.

6. New Low Voltage rural power grids power distribution cabinet according to claim 1, is characterized in that: the appliance component in power distribution cabinet comprises isolating switch (3), circuit breaker (5), current transformer (22), fuse (7), lightning arrester (23);

The conductor of isolating switch (3) through being equipped with current transformer (22) is connected respectively with circuit breaker (5) upper port, and zero line is directly connected to circuit breaker (5) by conductor from isolating switch (3) upper port position without isolating switch (3);

Circuit breaker (5) lower port is connected with fuse (7), each phase line leading-out terminal of fuse (7) is all connected with lightning arrester (23), lightning arrester (23) other end is linked together by conductor, and then being connected to earth point (20) by wire again, zero line leading-out terminal does not connect lightning arrester (23).

7. New Low Voltage rural power grids power distribution cabinet according to claim 6, it is characterized in that: instrument current circuit is connected with current transformer (22) by wire, voltage circuit is connected to voltage change-over switch by wire, voltage change-over switch is connected to secondary fuse (21), secondary fuse (21) other end is connected to each phase electric conductor, and indicator light (2) connects the fuse outgoing line side of every primary Ioops A, C two-phase respectively by wire.