CN204633338U - A capacitor reactive power compensation cabinet - Google Patents

Abstract

The utility model discloses a kind of capacitance reactive compensation cabinet, comprise cabinet and cabinet door, basement, breaker chamber and element interstar connection room is provided with in described cabinet, three-phase entrance hole is provided with in its basement, copper bar is provided with as main bus bar in three-phase entrance hole, three-phase total compensation unit and phase splitting compensation unit is provided with in cabinet, described three-phase total compensation unit is three common benefit single phase circuits of connecting corresponding to each phase copper bar respectively, it is mended single phase circuit altogether and is provided with fuse, controllable silicon composite switching switch, reactor and capacitor, and is linked together by wire; Described phase splitting compensation unit is also divided into three point benefit single phase circuits of connecting corresponding to three-phase copper bar respectively, and be also electrically connected with fuse, controllable silicon composite switching switch, reactor and capacitor, the utility model when reactive power compensation can according to the concrete condition of electric power system by fling-cut switch complete complete mend with point separate compensation of mending and with the use of, be conducive to the technical problem solving the compensation of three-phase imbalance impact load.

Description

A capacitor reactive power compensation cabinet

technical field

The utility model relates to an electrical control cabinet, in particular to a capacitor reactive power compensation cabinet, which belongs to the technical field of electrical engineering.

Background technique

Reactive power compensation plays a role in improving the power factor of the power grid in the power supply system, reducing the loss of power supply transformers and transmission lines, improving power supply efficiency, and improving the power supply environment. Therefore, reactive power compensation devices play a very important role in the power supply system. The location of the compensation device and the reasonable selection of the compensation device can minimize the loss of the network and improve the quality of the power grid. However, if it is improperly selected or used, it may cause many factors such as voltage fluctuations and harmonic increases in the power supply system. In the power system, most of the loads are asynchronous motors. The equivalent circuit of an asynchronous motor can be regarded as a series circuit of resistance and inductance, the phase difference between the voltage and current is relatively large, and the power factor is low, and the function of the capacitance compensation cabinet is equivalent to connecting a capacitor in parallel on it. It will offset part of the inductor current, so that the inductor current will decrease, the total current will decrease accordingly, the phase difference between voltage and current will become smaller, and the power factor will be improved. However, in the existing technology, such as the Chinese patent application number 201310578419.0 The patent document provides a reactive power compensation cabinet. Although it can play a role of co-complementation, it cannot play a role of reasonable allocation under different circumstances. Most of the switching switches used in the system are contact connections, and there are disadvantages such as power compensation switching contactor contacts are prone to burnout, large capacitive current impact, etc., and the existing compensation methods are generally three-phase common compensation and separate compensation. However, there are many situations in which the power factor may decrease in the power system, and some of them are single-phase lack of reactive power. If the full compensation is used at this time, it seems that the loss outweighs the gain. Only using single-phase compensation will fail to meet the requirements when the three-phase power factors are all reduced.

Utility model content

Aiming at the above-mentioned deficiencies in the prior art, the utility model proposes a capacitor reactive power compensation cabinet, which includes a cabinet body and a cabinet door, and the cabinet body is provided with an incoming line room, a circuit breaker room and a component wiring room, and its incoming line There are three-phase wire inlets in the room, and copper bars are arranged in the three-phase wire inlets as the main busbar. There are three-phase common compensation units and phase-separated compensation units in the cabinet. The three-phase common compensation units are three and respectively connected to each The co-complementary single-phase circuit correspondingly connected to the phase copper bar is provided with a fuse, a thyristor compound switching switch, a reactor and a capacitor, and is connected together by wires; the phase-splitting compensation unit is also It is divided into three sub-compensation single-phase circuits that are respectively connected to the three-phase copper bars, and are also electrically connected to fuses, thyristor composite switching switches, reactors and capacitors. The utility model can be used in reactive power compensation according to According to the specific situation of the power system, the individual compensation and joint use of full compensation and partial compensation can be completed through switching switches, which is conducive to solving the technical problem of three-phase unbalanced impact load compensation.

The utility model solves the technical problem. The adopted technical solution is: a capacitor reactive power compensation cabinet, including a cabinet body and a cabinet door, the cabinet body and the cabinet door are connected by hinges, and a controller is arranged on the cabinet door. Its structural features are: the inside of the cabinet is provided with an inlet room, a circuit breaker room and a component wiring room from top to bottom, and three-phase wire inlet holes are arranged in the wire inlet room, and the three-phase wire inlet holes are arranged side by side. , a copper bar is set in the three-phase inlet hole as the main busbar; a three-phase common compensation unit, a phase-separated compensation unit, a circuit breaker and a contactor are also arranged in the cabinet, and the three-phase common compensation unit is three respectively connected to each The co-complementary single-phase circuit connected correspondingly to the phase copper bar, the co-complementary single-phase circuit is provided with a fuse, a thyristor composite switching switch, a reactor and a capacitor, and is connected together by wires; the phase-splitting compensation unit It is also divided into three sub-complementary single-phase circuits that are respectively connected to the three-phase copper bars, and the sub-complementary single-phase circuits are also electrically connected with fuses, thyristor compound switching switches, reactors and capacitors.

Further, the fuse, thyristor compound switching switch, reactor and capacitor are placed in the element wiring room, the element wiring room is divided into a front part and a rear part, and the capacitor is arranged in the rear part, and the possible The silicon-controlled compound switching switch, reactor and fuse are placed in the front in sequence from top to bottom.

Further, the circuit breaker is arranged in the circuit breaker room, and the circuit breaker is a handcart type circuit breaker.

Preferably, the capacitors of the co-complementary single-phase circuit are connected end-to-end through a contactor.

Preferably, the capacitors of the sub-complementary single-phase circuit are six capacitors connected in parallel through a contactor, and are grounded through a ground wire.

Preferably, both the three-phase common compensation unit and the split-phase compensation unit are electrically connected to the copper bar through a transformer and the circuit breaker.

Preferably, a temperature and humidity sensor is provided inside the cabinet, and a receiving display is provided on the cabinet or the cabinet door, and the receiving display is electrically connected to the controller.

Preferably, a heating sheet is also provided inside the cabinet, and the heating sheet is electrically connected to the controller.

Further, a lightning arrester is also provided on the cabinet, and the lightning arrester is grounded through a grounding wire.

Preferably, a cooling fan is also provided on the top of the cabinet.

Compared with the prior art, the beneficial effect of the utility model is: a reactive power compensation cabinet proposed by the utility model, by placing the three-phase full compensation circuit and the single-phase compensation circuit in the same cabinet and connecting with the non-contact It can be used together with the thyristor compound switching switch at the point of reactive power compensation. According to the specific conditions of the power system, the separate compensation and cooperative use of the full compensation and partial compensation can be completed through the switching switch, which solves the three-phase unbalanced impact load. The technical problem of compensation, the use of intelligent controller control also optimizes its switching mode. According to the lack of reactive power in the power system, it can be reasonably selected for sub-complementation and co-compensation, and it also achieves high-efficiency work that realizes multiple compensations through one cabinet. Purpose, and the thyristor compound switching switch can realize fast switching without transition of multi-stage capacitor bank, which overcomes the shortcomings of traditional reactive power compensation switching contactor contact burnout and large capacitive current impact.

Description of drawings

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.

Fig. 1 is a schematic structural diagram of a reactive power compensation cabinet of the present invention.

Fig. 2 is a structural schematic diagram of a reactive power compensation cabinet of the present invention when the door is closed.

FIG. 3 is a rear view of FIG. 1 .

Fig. 4 is a left side view of Fig. 1 .

FIG. 5 is a top view of FIG. 1 .

Fig. 6 is a schematic circuit diagram of a reactive power compensation cabinet of the present invention.

In the figure: 1. Capacitor reactive power compensation cabinet; 2. Cabinet body; 201. Cabinet door; 3. Inlet room; 4. Circuit breaker room; 5. Component wiring room; row; 401. circuit breaker; 8. controller; 9. contactor; 10. thyristor compound switching switch; 11. reactor; 12. capacitor; 501. front; 502. rear; 13. transformer ; 14. Temperature and humidity sensor; 15. Receiving display; 16. Heating sheet; 17. Lightning arrester; 18. Ground wire; 19. Cooling fan;

specific implementation plan

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 6, the first specific embodiment of the utility model is: a capacitor reactive power compensation cabinet, including a cabinet body 2 and a cabinet door 201, and the cabinet body 2 and the cabinet door 201 are connected by hinges , the interior of the cabinet body 2 is provided with an incoming line room 3, a circuit breaker room 4, and a component wiring room 5 from top to bottom, and the left side of the incoming line room 3 is provided with a three-phase line-in hole 6, and the three-phase line-in The holes 6 are arranged side by side, and a copper bar 7 is arranged in the three-phase incoming hole 6 as the main busbar. The capacitor reactive power compensation cabinet 1 is provided with a three-phase common compensation unit, a phase-splitting compensation unit, a circuit breaker 401, a contactor 9 and The controller 8, the three-phase co-compensation unit is three co-compensation single-phase circuits that are respectively connected to the copper bars 7 of each phase, and the co-complement single-phase circuit is provided with a fuse 20 and a thyristor composite switching switch 10 , a reactor 11 and a capacitor 12, and are connected together by wires; the phase-splitting compensation unit is three separate-complement single-phase circuits that are respectively connected to the three-phase copper bars 7, and the separate-compensation single-phase circuits are also connected to the fuse 20 , Thyristor composite switching switch 10, reactor 11 and capacitor 12 are connected by wires, that is, the common complementary single-phase circuit and the sub-complementary single-phase circuit share electrical components.

The fuse 20, the thyristor compound switching switch 10, the reactor 11 and the capacitor 12 are placed in the component wiring compartment 5, and the component wiring compartment 5 is divided into a front part 501 and a rear part 502, and the capacitor 12 is arranged in The rear part 502, the thyristor compound switching switch 10, the reactor 11, and the fuse 20 are arranged in the front part 501 sequentially from top to bottom, and the controller 8 is a DSP digital signal processor and is arranged on the cabinet door 201 In fact, because the existing compensation methods are generally three-phase co-compensation and sub-complementation are carried out separately, there is no cooperative auxiliary role between the two, and there are many situations in which the power factor may decrease in the power system. Some single-phase lacks reactive power. If the full compensation is used at this time, the loss outweighs the gain, and only single-phase compensation will fail to meet the requirements when the power factors of the three phases are all reduced. In this embodiment, by combining the three The phase co-compensation circuit and the single-phase compensation circuit are placed in the same cabinet and used in conjunction with the non-contact thyristor composite switching switch 10. During reactive power compensation, the thyristor can be used according to the specific conditions of the power system. Composite switching switch 10 completes separate compensation and joint use of common compensation and sub-compensation, solves the technical problem of three-phase unbalanced impact load compensation, uses intelligent controller 8 to realize intelligent control, and intelligently optimizes the switching mode. Within the dynamic response time, the multi-level compensation is in place at one time, which also achieves the high-efficiency work purpose of realizing multiple compensations through one cabinet, and the thyristor composite switching switch 10 can realize fast and non-transition switching of multi-level capacitor banks , to overcome the shortcomings of traditional reactive power compensation switching contactor contact burnout and large capacitive current impact, the controller 8 is a dynamic reactive power compensation controller, an intelligent product using a DSP digital signal processor structure, dedicated The new power distribution monitoring equipment developed for the dynamic reactive power compensation control system integrates multiple functions such as dynamic reactive power compensation control, harmonic filtering, power parameter measurement, limit detection, event recording and data communication.

It is worth noting that the capacitor units of the three-phase co-complementing single-phase circuit are connected end to end through a contactor 9, and the capacitor units of the split-complementing single-phase circuit of the phase-splitting compensation unit are six capacitors 12 connected in parallel through the contactor 9 And grounded through the ground wire 18, the three-phase common compensation unit and the phase-splitting compensation unit share electrical components. When the contactor 9 connects the wires connected from end to end of the capacitor 12, it is disconnected by the contactor 9 when the sub-complement is used, so as to realize the automatic switching operation of the common compensation and the sub-complement, and through the available The silicon-controlled composite switching switch 10 can also realize fast transition-free switching of multi-stage capacitor banks.

In addition, both the three-phase co-complementary unit and the split-phase compensation unit are connected to the copper bar 7 through the transformer 13 and the circuit breaker 401. The copper bar 7 is used as the main bus to transmit the rated current. Considering To the skin effect of the copper bar 7, the selection of the copper bar 7 needs to be selected according to the national standard, and the circuit breaker 401 is a handcart circuit breaker, and is placed in the circuit breaker room 4 together with the contactor, so that It is relatively convenient to install, and the inside of the cabinet 2 is provided with a temperature and humidity sensor 14, and the cabinet is provided with a receiving display 15, and the receiving display 15 is electrically connected to the controller 8, and the inside left surface of the cabinet 2 and A heating sheet 16 is arranged on the right surface, and the heating sheet 16 is connected to the controller 8 by wires. The temperature and humidity sensor 14 is inside the cabinet 2. It can detect and collect the temperature and humidity inside the cabinet 2, and then transmit the collected temperature and humidity to the controller 8 through the data line. The controller 8 and the receiving display 15 Electrically connected, and display the temperature and humidity inside the cabinet 2 through the receiving display 15, and the controller 8 controls the heating sheet 16 to generate heat when the cabinet 2 needs to be heated and dehumidified. Such safety settings can ensure safe and reasonable work of the cabinet under various circumstances.

At the same time, as shown in Figure 3, the present embodiment is also fixed with a lightning arrester 17 on the cabinet body 2. The lightning arrester 17 is threadedly connected with the cabinet body and grounded through the grounding wire 18. voltage and resonance overvoltage, when the utility model has an overvoltage, the arrester 17 can transmit the voltage to the earth, as shown in Figure 5, the top of the cabinet 2 is provided with 4 cooling fans 19, and evenly Placement, the effect of the cooling fan 19 is to discharge the heat generated inside the compensation cabinet into the air to prevent it from being too high due to insufficient heat dissipation, and the protection level of the cabinet shell is IP40, which meets the national standard and can achieve the purpose of use.

The above is only the preferred embodiment of the utility model, it should be pointed out that, for those of ordinary skill in the art, without departing from the inventive concept of the utility model, some deformations and improvements can also be made. Belong to the protection scope of the utility model.

Claims (7)

1. a capacitance reactive compensation cabinet, comprise cabinet and cabinet door, described cabinet and cabinet door are connected through the hinge, cabinet door is provided with controller, it is characterized in that: described cabinet inside is provided with basement, breaker chamber and element interstar connection room from top to bottom, in described basement, be provided with three-phase entrance hole, described three-phase entrance hole is arranged side by side, and is provided with copper bar as main bus bar in three-phase entrance hole; Three-phase total compensation unit, phase splitting compensation unit, circuit breaker and contactor is also provided with in cabinet, described three-phase total compensation unit is three common benefit single phase circuits of connecting corresponding to each phase copper bar respectively, described single phase circuit of mending altogether is provided with fuse, controllable silicon composite switching switch, reactor and capacitor, and is linked together by wire; Described phase splitting compensation unit is also divided into three point benefit single phase circuits of connecting corresponding to three-phase copper bar respectively, and described point of benefit single phase circuit is also electrically connected with fuse, controllable silicon composite switching switch, reactor and capacitor.

2. a kind of capacitance reactive compensation cabinet according to claim 1, it is characterized in that: described fuse, controllable silicon composite switching switch, reactor and capacitor are placed in element interstar connection room, described element interstar connection room is divided into front and rear, described capacitor is located at rear portion, and described controllable silicon composite switching switch, reactor, fuse are placed on front portion from top to bottom successively.

3. a kind of capacitance reactive compensation cabinet according to claim 1, is characterized in that: described circuit breaker is arranged on breaker chamber, and described circuit breaker is handcart type breaker.

4. a kind of capacitance reactive compensation cabinet according to any one of claim 1 to 3, is characterized in that: described cabinet inside is also provided with Temperature Humidity Sensor, cabinet or cabinet door are also provided with reception display, and described reception display is electrically connected with controller.

5. a kind of capacitance reactive compensation cabinet according to claim 4, is characterized in that: described cabinet inside is also provided with fever tablet, and described fever tablet is electrically connected with controller.

6. a kind of capacitance reactive compensation cabinet according to any one of claim 1 to 3, it is characterized in that: on described cabinet, be also provided with lightning arrester, described lightning arrester passes through ground connection.

7. a kind of capacitance reactive compensation cabinet according to any one of claim 1 to 3, is characterized in that: be also provided with radiator fan at described cabinet top.