CN203242926U - Low-voltage power distribution cabinet with residual current protection function - Google Patents

Abstract

A low-voltage power distribution cabinet with a residual current protection function, which includes a cabinet body and a primary circuit installed in the cabinet body, a secondary control circuit, a leakage protector, a metering anti-theft module and a current measurement circuit on the outlet side. After adopting the above structure, the low-voltage power distribution cabinet integrates the low-voltage incoming and outgoing lines, which not only reduces the cost, saves space, but also improves the safety factor, and allows users to use it with confidence, reducing the chance of leakage and electric shock. The utility model connects the internal components through the shortest distance and the least use of electric connecting wires. It not only has the characteristics of simple structure, convenient use, safe and reliable operation, etc., but also can perform trip protection according to different leakage conditions. It can be used with metering Cabinets and capacitor cabinets are installed in conjunction with a unified busbar copper bar, which can meet the power supply and distribution, compensation, and billing issues of small-capacity transformers in rural power grids.

Description

A low-voltage power distribution cabinet with residual current protection function

technical field

The utility model relates to the technical field of a low-voltage power distribution cabinet, in particular to a low-voltage power distribution cabinet with a residual current protection function.

Background technique

With the rapid development of the rural economy, the power consumption in rural areas is increasing, and the reliability requirements for power supply are getting higher and higher. The original low-voltage power distribution cabinets such as PGL and GGD can no longer meet the needs of rural power supply. The components installed inside the cabinet are relatively single, and the functions are relatively backward, and the equipment of different cabinet types needs to be installed in different types of cabinets, which wastes space and has a wide range of impacts after a fault occurs, which brings a lot of inconvenience to users, especially when the circuit breaks down. In case of leakage, if the power cannot be cut off in time, it will cause a safety accident.

Utility model content

In view of the above shortcomings, the utility model provides a low-voltage power distribution cabinet with the characteristics of convenient installation, space saving and residual current protection, which is not only easy to install, but also occupies a small space.

In order to solve the above problems, the utility model adopts the following technical solutions: a low-voltage power distribution cabinet with residual current protection function, including a cabinet body and a primary circuit and a secondary control circuit installed in the cabinet body. It is characterized in that,

The primary circuit includes an input isolating switch, a main circuit breaker, a shunt residual current protection circuit breaker, and an output isolating switch. The low-voltage incoming line is connected to the upper static contact of the input isolating switch through an incoming copper bar. The lower static contact of the isolating switch is connected to the upper static contact of the main circuit breaker through the connecting busbar, and the lower static contact of the main circuit breaker is respectively connected to the upper port of the shunt residual current protection circuit breaker through the horizontal row. The static contact is connected, the static contact at the lower port of the shunt residual current protection circuit breaker is connected with the static contact at the upper port of the output isolating switch, and the static contact at the lower port of the output isolating switch is connected with the load;

The secondary control circuit includes a leakage protection circuit, a closing circuit, a tripping circuit and a residual current protection circuit breaker. The A-phase power terminal is connected, and the output ends are respectively connected with the lower moving contacts of the main circuit breaker.

Further, a leakage protector is also included, and the leakage protector controls the leakage tripping of the main circuit breaker.

Further, a metering anti-theft module is also included, and the metering anti-theft module is connected to the power distribution cabinet door node.

Further, a current measuring circuit on the outlet side is also included, and a current transformer is additionally connected to an ammeter to measure and monitor the load current of the outlet.

Further, the front door of the cabinet includes an upper and lower door structure, the upper front door is provided with an ammeter, a voltmeter, a transfer switch, a circuit breaker opening and closing indicator light and a button, and the lower front door is provided with a main circuit breaker opening and closing hand switch with nameplate.

The beneficial effect of the utility model is: after adopting the above structure, the low-voltage power distribution cabinet integrates low-voltage incoming and outgoing lines, which not only reduces the cost, saves space, but also improves the safety factor, and allows users to use it with confidence and reduces leakage , The probability of electric shock.

The utility model connects the internal components through the shortest distance and the least electrical connection wires. It not only has the characteristics of simple structure, convenient use, safe and reliable operation, etc., but also can perform trip protection according to different leakage conditions. It can be used with metering Cabinets and capacitor cabinets are installed in conjunction with a unified busbar copper bar, which can meet the power supply and distribution, compensation, and billing issues of small-capacity transformers in rural power grids.

Description of drawings

Fig. 1 is the front panel diagram of the present utility model;

Fig. 2 is a front internal structure diagram of the utility model;

Fig. 3 is a back internal structure diagram of the utility model;

Fig. 4 is a schematic diagram of the primary loop circuit of the present utility model;

Fig. 5 is the schematic diagram of the secondary control loop circuit of the present utility model;

In the figure, 1 cabinet body, 2 voltmeter, 3 transfer switch, 4 ammeter, 5 indicator light, 6 button, 7 upper cabinet door, 8 lower cabinet door, 9 brow, 10 main circuit breaker opening and closing, 11 main circuit breaker Opening and closing handle, 12 bus bars, 13 front horizontal bars, 14 incoming copper bars, 15 input isolating switch, 16 main circuit breaker, 17 residual current protection circuit breaker, 18 leakage protector, 19 nameplate, 20 output isolating switch, 21 zero line row, 22 rear horizontal row.

Detailed ways

As shown in Figures 1 to 5, a low-voltage power distribution cabinet with residual current protection function of the utility model includes a cabinet body and a primary circuit installed in the cabinet body, a secondary control circuit, a leakage protector 18, a metering Anti-theft module and current measurement circuit on the outlet side.

The primary circuit includes an input isolating switch 15, a main circuit breaker 16, a shunt residual current protection circuit breaker 17, and an output isolating switch 20. The lower static contact of the input isolating switch 15 is connected to the upper static contact of the main circuit breaker 16 by connecting the front row 13 and the bus bar 12, and the lower static contact of the main circuit breaker 16 The upper static contacts of the shunt residual current protection circuit breaker 17 are respectively connected through the rear horizontal row 22, the lower static contact of the shunt residual current protection circuit breaker 17 is connected with the upper static contact of the output isolating switch 20 The lower static contact of the output isolating switch 20 is connected to the load.

The secondary control loop includes a leakage protection circuit, a closing circuit, a tripping circuit and a residual current protection circuit breaker 17, and the input ends of the leakage protection circuit, the closing circuit, a tripping circuit and the residual current protection circuit breaker 17 are respectively fused The switch is connected to the A-phase power supply terminal, and the output ends are respectively connected to the lower moving contacts of the main circuit breaker 16.

The leakage protector 18 controls the leakage tripping of the main circuit breaker; the metering anti-stealing module is connected to the node of the distribution cabinet door; Perform measurement monitoring.

The front door of the cabinet body 1 includes an upper and lower door structure, the upper front door 7 is provided with an ammeter 4, a voltmeter 5, a transfer switch 3, a circuit breaker opening and closing indicator light 5 and a button 6, and the lower front door 8 is provided with a main Circuit breaker opening and closing hand brake 10, main circuit breaker opening and closing hand brake handle 11 and nameplate 19; the upper end of the cabinet body 1 is provided with a brow 9.

The utility model has the following characteristics:

1. Copper busbars are used for the connection of various components, which can reduce the specifications compared with aluminum plates on the basis of meeting the rated current, and are easy to install and beautiful in craftsmanship.

2. The incoming line isolating switch adopts the arc-extinguishing type isolating switch, so that an obvious current disconnection point is set in the main current circuit, and it can play the role of arc extinguishing when the switch is opened and closed, which is also very convenient for the user's maintenance.

3. The main circuit breaker adopts DW type universal circuit breaker, which can not only realize electric operation, but also has the breaking capacity of frame circuit breaker, and its small size saves installation space. The shunt coil installed inside the air can realize arrears tripping and leakage Protection tripping function.

4. The output residual current circuit breaker configures the size of the rated current according to the calculated current of the user's downstream load, and the circuit breaker enables the power distribution cabinet to have the following functions:

(1) Residual current detection protection function, leakage self-recovery power transmission function. However, the circuit breaker is only equipped with a leakage detection trip self-recovery function. If the line leakage persists, the circuit breaker self-recovery function will be self-locked and no longer closed.

(2) Residual current and load current are adjustable. The residual current automatic tracking function adjustment can automatically set the appropriate residual current action value according to the actual situation of the line, and carry out tracking processing for changes in the actual situation of the line. The load current of the circuit breaker can be adjusted to realize reasonable shunt power distribution.

(3) The baud function can automatically distinguish between human body and equipment grounding faults. The circuit breaker can distinguish between human body and equipment grounding faults, which is convenient for operation and management personnel to quickly judge the fault site situation and shorten the fault handling time.

(4) Real-time display of three-phase current conditions to avoid unbalanced three-phase. For the residual current operated circuit breaker, you can check the three-phase current situation on the circuit breaker body, which is convenient for adjusting the unbalanced three-phase current, effectively improving the reliability of the leakage operation of the residual current operated circuit breaker, and protecting the transformer from overload operation.

(5) The residual current operated circuit breaker is used as a branch outlet switch, which can be combined with the company's existing centralized copy host and remote negative control terminal to realize remote control of the residual current operated circuit breaker. Remote implementation, sub-circuit breaker tripping, SMS notification function. It is also possible to query the cause of the remote tripping of the host, realize remote unlocking, and remotely control the emergency closing of the residual current action circuit breaker. This function, combined with existing resources, basically requires no investment, realizes low-network intelligence, and has good applicability.

5. The outlet isolating switch uses a knife fuse switch, and a fuse is installed inside. First, it can play the role of an obvious disconnection point, which is convenient for maintenance; second, when the load outlet fails or the current is large, the fuse core can be burned out to protect the load equipment. role.

The above is only a preferred embodiment of the utility model, and for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, and these improvements and modifications are also regarded as It is the protection scope of the utility model.

Claims (5)

1. the low-voltage distribution cabinet with residual current protecting function comprises cabinet and is installed in cabinet interior primary circuit and secondary control loop, it is characterized in that,

Described primary circuit comprises the input isolating switch, main circuit breaker, the shunt Aftercurrent protection circuit breaker, the output isolating switch, described low pressure inlet wire is connected to the fixed contact suitable for reading of input isolating switch by the inlet wire copper bar, the end opening fixed contact of described input isolating switch is connected with the fixed contact suitable for reading of main circuit breaker by connecting busbar, the end opening fixed contact of described main circuit breaker is connected with the fixed contact suitable for reading of shunt Aftercurrent protection circuit breaker respectively by horizontally-arranged, described shunt Aftercurrent protection circuit breaker end opening fixed contact is connected with the fixed contact suitable for reading of output isolating switch, and the end opening fixed contact of described output isolating switch is connected with load;

Described secondary control loop comprises leakage protection loop, closing circuit, trip(ping) circuit and Aftercurrent protection circuit breaker; described leakage protection loop, closing circuit, trip(ping) circuit and Aftercurrent protection circuit breaker are connected input and are connected with A phase power supply terminal by fuse respectively, and output is connected with the end opening moving contact of main circuit breaker respectively.

2. a kind of low-voltage distribution cabinet with residual current protecting function according to claim 1 is characterized in that, also comprises earth leakage protective device, the leakage tripping of described earth leakage protective device control main circuit breaker.

3. a kind of low-voltage distribution cabinet with residual current protecting function according to claim 1 is characterized in that, also comprises the metering module for anti-fraudulent, and described metering module for anti-fraudulent is connected with described distribution cabinet door node.

4. a kind of low-voltage distribution cabinet with residual current protecting function according to claim 1 is characterized in that, also comprises the outgoing line side current measurement circuit, installs current transformer additional and connects ammeter, and the outlet load current is measured monitoring.

5. according to claim 1 to 4 each described a kind of low-voltage distribution cabinets with residual current protecting function; it is characterized in that; described cabinet Qianmen comprises the upper-lower door structure; described upper Qianmen is provided with ammeter, voltmeter, change over switch, circuit-breaker switching on-off indicator light and button, and described lower Qianmen is provided with main circuit breaker deciliter rim brake and nameplate.

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