Temperature control low-voltage power distribution cabinet

Abstract

The utility model relates to a temperature-control low-voltage power distribution cabinet, which is characterized by comprising a wire inlet chamber, a capacitance compensation chamber and a wire outlet chamber, the wire inlet chamber is provided with a three-phase copper bar connected to the intelligent frame circuit breaker, the wire outlet end of the intelligent frame circuit breaker in the wire outlet chamber is connected to the molded case circuit breaker through the three-phase copper bar, and the capacitance compensation chamber is provided with a compensation controller, a compensation knife switch, a compensation alternating current contactor and a compensation capacitance device; the wire inlet end of the compensation knife switch is connected to the intelligent frame circuit breaker, and the wire outlet end of the compensation knife switch is connected to the compensation alternating current contactor, the compensation capacitor device and the compensation controller through a three-phase copper bar; the compensation capacitor device comprises a temperature controller, a temperature sensor and a heat dissipation fan; the temperature sensor and the heat dissipation fan are respectively connected to the temperature controller; the power distribution cabinet has an incoming line voltage and current short-circuit protection function and an outgoing line branch circuit breaker electric leakage, overcurrent and short-circuit protection function, integrates capacitor temperature monitoring alarm and automatic heat dissipation functions, avoids equipment damage, and is safe to use.

Description

Technical Field

[0001] The utility model belongs to the field of low-voltage power distribution, and particularly relates to a temperature-controlled low-voltage power distribution cabinet. Background Technique

[0002] For special transformer users whose transformer capacity may be in the range of (100 kVA - 315 kVA), the low-voltage side electrical equipment needs to be equipped with a switch cabinet with negative control metering functions. Existing such switch cabinets are costly, occupy a large floor area when installed on the ground, and also require the construction of a distribution room, resulting in waste of resources. The floor area is at least 5 - 6 square meters. Moreover, the combined cabinet is tall and large in volume, still occupying a large space, and is extremely inconvenient to use and operate, with relatively high costs. At the same time, there are safety hazards in the low-voltage power distribution cabinets configured on the user's low-voltage side. Especially in high-temperature climates, when operating for a long time, the electrical components heat up, and the live electrical components may produce sparks due to leakage, overcurrent, and short circuit, and the electrical components are more likely to catch fire.

[0003] Therefore, for a large number of special transformer users, when solving the problem of simplifying the equipment of the low-voltage side electrical power distribution cabinet, the floor area of the combined power distribution cabinet is relatively reduced, and the cost is relatively reduced. At the same time, it is necessary to consider improving the performance of the low-voltage side electrical equipment, considering the safe use problem of temperature control, fire prevention, and explosion prevention of the power distribution equipment, and facilitating wide promotion and use. Summary of the Invention

[0004] The problem to be solved by the utility model is that the functional cabinets configured for the low-voltage side electrical equipment of existing special transformer users not only occupy a large floor area, are large in volume and occupy a large space, and have high cost, but also have safety problems such as explosion and combustion due to leakage, overcurrent, and short circuit of the existing power distribution cabinets caused by too high temperature. A temperature-controlled low-voltage power distribution cabinet is provided, which integrates the functions of capacitor temperature monitoring and warning and automatic heat dissipation while having the functions of short-circuit protection for incoming line voltage and current and leakage, overcurrent, and short-circuit protection for outgoing branch circuit breakers, improving the safety of using the power distribution cabinet.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a temperature-controlled low-voltage power distribution cabinet, mainly including an incoming line chamber, a capacitor compensation chamber, and an outgoing line chamber;

[0006] A three-phase copper busbar is installed in the incoming line chamber to connect to an intelligent frame circuit breaker, and the intelligent frame circuit breaker is connected to an ammeter;

[0007] A three-phase copper busbar is installed in the outgoing line chamber to connect to a molded case circuit breaker; the outgoing end of the intelligent frame circuit breaker is connected to the molded case circuit breaker through a three-phase copper busbar, and the molded case circuit breaker is connected to an ammeter;

[0008] The capacitor compensation chamber is equipped with a compensation controller, a compensation knife switch, a compensation AC contactor, and a compensation capacitor device; the incoming line terminal of the compensation knife switch is connected to the intelligent frame circuit breaker, the outgoing line terminal of the compensation knife switch is connected to the compensation AC contactor through a three-phase copper busbar, the compensation capacitor device is connected to the compensation AC contactor, and the compensation AC contactor is connected to the compensation controller;

[0009] The compensation capacitor device includes a temperature controller, a temperature sensor, and a cooling fan. The temperature sensor and the cooling fan are respectively connected to the temperature controller, and the temperature controller is connected to the compensation AC contactor;

[0010] The three-phase copper busbars in the incoming line chamber are connected to the incoming line cable, the three-phase copper busbars in the outgoing line chamber are connected to the outgoing line cable, and the other ends of the three-phase copper busbars in the outgoing line chamber are lapped at the lower end of the molded case circuit breaker; the three-phase copper busbars connect the incoming line cable, the intelligent frame circuit breaker, the molded case circuit breaker, and the outgoing line cable to form a main circuit.

[0011] Preferably, buttons and indicator lights are installed on the intelligent frame circuit breaker, and indicator lights are installed on the molded case circuit breaker.

[0012] The advantages and positive effects of the present utility model are:

[0013] 1. Capacitor compensation unit: The compensation controller automatically issues on / off control signals according to the magnitude of the user load current and the change of the power factor, controls the compensation AC contactor to disconnect and close, and the compensation capacitor device emits capacitive current to balance the inductive current on the user's power consumption side, so as to compensate and improve the power factor to meet the requirements. The capacitor compensation function is controlled by the knife switch in the capacitor compensation chamber to be put into and withdrawn from operation; at the same time, a temperature sensor is set on the compensation capacitor device to monitor the ambient temperature, and the alarm temperature and forced cooling temperature are set on the temperature controller. When the capacitor temperature reaches the alarm temperature, the temperature controller starts to alarm and issue an alarm. When it reaches the forced cooling temperature, the temperature controller starts to control the cooling fan to cool the capacitor forcibly.

[0014] 2. Incoming line chamber unit: The intelligent frame circuit breaker is used to monitor and protect the user's outgoing line electrical equipment in real time, providing protection functions such as overcurrent, short circuit, over- and under-voltage, etc. As the main switch, the intelligent frame circuit breaker provides real-time protection for the electrical equipment at the user's end and provides real-time current data for the user to view the magnitude of the power consumption load.

[0015] 3. Outgoing line chamber unit: The branch molded case circuit breaker reasonably distributes the power consumption load current of the electrical equipment in each outgoing line circuit of the user. The indicator lights feedback the on / off operation status of the molded case circuit breakers in each branch outgoing line circuit and provide leakage, overcurrent, and short circuit protection functions for the branch, and has the function of automatically cutting off the power supply for fire alarm to avoid equipment damage.

[0016] 4. In this utility model, a temperature-controlled low-voltage power distribution cabinet adopts an incoming line chamber, a metering chamber, and an outgoing line chamber. Three-phase copper bars connect the incoming line cable, intelligent frame circuit breaker, molded case circuit breaker, and outgoing line cable to form a main circuit. The capacitor compensation chamber balances the inductive current on the user's power consumption side to compensate and improve the power factor to meet the requirements. The branch circuit breaker in the outgoing line chamber has functions of leakage, overcurrent, and short-circuit protection for leakage, overcurrent, and short-circuit protection. It has the function of automatically cutting off the power supply for fire alarm. At the same time, the capacitor compensation chamber monitors the capacitor temperature and has an automatic heat dissipation function, and conducts overvoltage protection to avoid equipment damage and ensure safe use, which is convenient for extensive promotion among a large number of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic side view structure of a temperature-controlled low-voltage power distribution cabinet of this utility model;

[0018] Figure 2 Schematic front view structure of a temperature-controlled low-voltage power distribution cabinet of this utility model.

[0019] 1 - Incoming line chamber, 2 - Three-phase copper bar, 3 - Intelligent frame circuit breaker, 4 - Ammeter, 5 - Outgoing line chamber, 6 - Molded case circuit breaker, 7 - Capacitor compensation chamber, 8 - Compensation controller, 9 - Compensation knife switch, 10 - Compensation AC contactor, 11 - Compensation capacitor device, 12 - Temperature controller, 13 - Temperature sensor, 14 - Cooling fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will further elaborate on this utility model in combination with specific embodiments.

[0021] As Figure 1 、 2 shown, a temperature-controlled low-voltage power distribution cabinet includes an incoming line chamber 1, a capacitor compensation chamber 7, and an outgoing line chamber 5. The incoming line chamber 1 is in the front half of the cabinet body, and the capacitor compensation chamber 7 is in the rear half of the cabinet.

[0022] The incoming line chamber 1 is installed with three-phase copper bars 2 connected to an intelligent frame circuit breaker 3. The negative control terminal is connected to the intelligent frame circuit breaker 3, serving as the main switch on the user's power consumption side. The intelligent frame circuit breaker 3 monitors the user's load current and voltage in real time, providing protection functions such as overcurrent, short-circuit, over- and under-voltage, etc., and providing real-time protection for the electrical equipment at the user's end. On the cabinet body of the incoming line chamber 1, incoming line instrument buttons and indicator lights are installed. The buttons control the opening and closing of the intelligent frame circuit breaker 3, and the indicator lights feedback the current opening and closing operation status of the intelligent frame circuit breaker 3.

[0023] The capacitor compensation chamber 7 is installed with a compensation knife switch 9, a compensation controller 8, several compensation AC contactors 10, a thermal relay, and a compensation capacitor device 11 through three-phase copper bars 2. The incoming line end of the compensation knife switch 9 is connected to the intelligent frame circuit breaker 3 through the three-phase copper bars 2. The outgoing line end of the compensation knife switch 9 is connected to several compensation AC contactors 10 by the three-phase copper bars 2. The main contacts of the compensation AC contactors 10 are connected to the compensation capacitor device 11. The compensation capacitor device 11 emits capacitive current to balance the inductive current on the user's power consumption side. The compensation knife switch 9 controls the input and output operation of the capacitor compensation function. The auxiliary contacts of the compensation AC contactors 10 are connected to the compensation controller 8 and are controlled by it to perform opening and closing. The compensation controller 8 is installed on the cabinet body on one side of the capacitor compensation chamber 7. The compensation capacitor device 11 consists of a temperature controller 12, a temperature sensor 13, and a cooling fan 14. The temperature sensor 13 is connected to the temperature controller 12, and the cooling fan 14 is also connected to the temperature controller 12. The warning temperature and forced cooling temperature are set on the temperature controller 12. When the capacitor temperature reaches the warning temperature, the temperature controller 12 starts to give an alarm and issues an alert.

[0024] The outgoing line chamber 5 connects the outgoing line end of the intelligent frame circuit breaker 3 to the molded case circuit breaker 6 through the three-phase copper bars 2. The molded case circuit breaker 6 reasonably distributes the power consumption load of the electrical equipment in each outgoing line circuit of the user and provides overcurrent and short-circuit protection for this branch. The outgoing line instrument indicator lights are installed on the cabinet body of the outgoing line chamber 5 to feedback the on-off operation status of the molded case circuit breaker 6 in each outgoing line circuit.

[0025] When the temperature-controlled low-voltage power distribution cabinet is working, the three-phase copper bars 2 in the incoming line chamber 1 are connected to the power supply cable, and the three-phase copper bars 2 in the outgoing line chamber 5 are connected to the outgoing line cable and are lapped on the outgoing line end of the molded case circuit breaker 6. The three-phase copper bars 2 connect the incoming line cable, the intelligent frame circuit breaker 3, the molded case circuit breaker 6, and the outgoing line cable to form a loop.

[0026] In the incoming line chamber 1, the intelligent frame circuit breaker 3 monitors the user's load current and voltage in real time, provides protection functions such as overcurrent, short-circuit, over- and under-voltage, and provides real-time protection for the electrical equipment at the user's end. The buttons and indicator lights control the opening and closing states of the intelligent frame circuit breaker 3. The outgoing line chamber 5 reasonably distributes the load of the user's electrical equipment and provides protection, and has the function of automatically cutting off the power supply for fire alarm to avoid equipment damage.

[0027] The capacitor compensation chamber 7 collects the user's current and voltage data, calculates the active power, reactive power and power factor during the user's power consumption, and automatically issues on / off control signals to control the disconnection and closing of the compensation AC contactor 10, balancing the inductive current on the user's power consumption side. When the power factor fails to meet the requirements of the power company, capacitors are put into operation to improve the power factor to meet the requirements of the power company. The temperature sensor 13 of the compensation capacitor device 11 is connected to the temperature controller 12 to monitor the ambient temperature. The alarm temperature and forced cooling temperature are set on the temperature controller 12. When the capacitor temperature reaches the alarm temperature, the temperature controller 12 starts to alarm and issue an alarm. If the temperature reduction treatment fails to be carried out in time and the temperature rises sharply, it will immediately reach the forced cooling temperature. If the forced cooling temperature is reached, the temperature controller 12 will start to control the cooling fan 14 to forcibly cool the capacitor at this time.

[0028] The above has described the embodiments of the present invention in detail, but the described content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention shall still fall within the scope covered by this patent.

Claims

1. A temperature-controlled low-voltage power distribution cabinet, characterized in that: The power distribution cabinet includes an incoming line room, a capacitor compensation room, and an outgoing line room; The incoming line room is equipped with a three-phase copper busbar connected to an intelligent frame circuit breaker, and the intelligent frame circuit breaker is connected to an ammeter; The outlet room is equipped with a three-phase copper busbar connected to a molded case circuit breaker; the outlet end of the intelligent frame circuit breaker is connected to the molded case circuit breaker through the three-phase copper busbar, and the molded case circuit breaker is connected to an ammeter; The capacitor compensation room is equipped with a compensation controller, a compensation knife switch, a compensation AC contactor, and a compensation capacitor device; the inlet end of the compensation knife switch is connected to the intelligent frame circuit breaker, the outlet end of the compensation knife switch is connected to the compensation AC contactor through a three-phase copper busbar, the compensation capacitor device is connected to the compensation AC contactor, and the compensation AC contactor is connected to the compensation controller; The compensation capacitor device includes a temperature controller, a temperature sensor, and a heat dissipation fan. The temperature sensor and the heat dissipation fan are respectively connected to the temperature controller, and the temperature controller is connected to the compensation AC contactor; The three-phase copper busbar in the incoming line room is connected to the incoming cable, the three-phase copper busbar in the outgoing line room is connected to the outgoing cable, and the other end of the three-phase copper busbar in the outgoing line room is overlapped on the lower end of the molded case circuit breaker; the three-phase copper busbar connects the incoming cable, the intelligent frame circuit breaker, the molded case circuit breaker, and the outgoing cable to form a main circuit.

2. A temperature-controlled low-voltage power distribution cabinet according to claim 1, characterized in that: The intelligent frame circuit breaker is equipped with a button and an indicator light, and the molded case circuit breaker is equipped with an indicator light.

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