CN209419232U - A three-phase unbalance compensation device and system - Google Patents

Abstract

The utility model relates to a kind of three-phase imbalance compensation device and systems, the three-phase imbalance compensation device, including compensating cabinet, sidecar and middle cabinet are equipped with inside the compensating cabinet, it is separated by partition between sidecar and middle cabinet, capacitor is equipped in sidecar, reactor and switching unit are set in middle cabinet, switching unit is set on the pull mounting plate of pull-out mechanism, pull-out mechanism include telescoping mechanism and and pull mounting plate connected to it, telescoping mechanism includes two telescopic rods arranged in a crossed manner, two telescopic rods are hinged by pin shaft, the lower end of one telescopic rod and fixed frame are hinged, the lower end of another telescopic rod and adjustable shelf are hinged；The utility model divides space in compensating cabinet cabinet, and capacitor is independently installed in sidecar, heat exchange when avoiding air-cooled, so that the temperature of environment where capacitor be effectively reduced, extends capacitor service life, is worth promoting.

Description

A three-phase unbalance compensation device and system

technical field

The utility model belongs to the technical field of electric power, in particular to a three-phase unbalance compensation device.

Background technique

The three-phase unbalance of the power system is caused by the unbalanced three-phase load and the asymmetry of the three-phase parameters of the system components. The state of the three-phase voltage balance of the power system is one of the main indicators of power quality. Three-phase unbalance will lead to additional heating and vibration of the rotating machine, increased magnetic flux leakage and local overheating of the transformer, increased line loss of the power grid, and misoperation of various protection and automatic devices, etc. Most of the solutions to the problem of unbalanced three-phase in the prior art are to use reactive power compensation devices to adjust the unbalanced active current. Most of the reactive power compensation devices in the prior art are to switch capacitors, reactors and Units and other equipment are installed in the cabinet. Because the reactor and the switching unit generate a lot of heat, heat will spread during the internal ventilation and cooling, which will cause the temperature of the space where the capacitor is located to rise accordingly, which will easily lead to the life of the capacitor that is more sensitive to temperature. reduce.

Utility model content

The purpose of this utility model is to provide a three-phase unbalance compensation device for independently installing capacitors and prolonging the service life of the capacitors in order to solve the above problems.

The utility model realizes above-mentioned purpose through following technical scheme:

A three-phase unbalance compensation device, including a compensation cabinet, the compensation cabinet is equipped with a side cabinet and a middle cabinet, the side cabinet and the middle cabinet are separated by a partition, and the side cabinet is equipped with a capacitor, a reactor and a power switch. The cutting unit is set in the middle cabinet, and the switching unit is set on the pull-out installation plate of the pull-out mechanism. The pull-out mechanism includes a telescopic mechanism and a pull-out installation plate connected to it. The telescopic mechanism includes two cross-set telescopic rods. The two telescopic rods are hinged by pin shafts, the lower end of one telescopic rod is hinged with the fixed frame, the lower end of the other telescopic rod is hinged with the movable frame, and the bottom of the movable frame is provided with guide wheels, which are set on the pull-out guide rails. The guide rail is fixedly connected to the compensation cabinet, and the fixing frame is fixedly connected to the inner walls of both sides of the compensation cabinet; the telescopic rod can rotate at the hinged part, and when the drawing installation plate is pulled out, the telescopic rod is driven to rotate, and then the telescopic mechanism is contracted, and the drawing installation plate is drawn along the When the guide rail is put back, it will drive the telescopic rod to reset and expand the telescopic mechanism; the pull-out structure of the pull-out mounting plate greatly facilitates the installation and maintenance of the capacitor, and the structure is stable; the reactor and the switching unit are located in a fixed installation On the board, the fixed mounting plate is fixedly connected with the partition.

As a further optimization scheme of the utility model, the top of the compensation cabinet is provided with a windshield, the top of the windshield is provided with an air inlet, the air inlet is provided with a fan, and the tops of the side cabinet and the middle cabinet are respectively provided with a There are air outlets on the lower part of the side cabinet and the middle cabinet, and the air outlet is connected to the exhaust pipe; the air enters the wind hood through the action of the fan, and then enters the side cabinet and the middle cabinet through the opening on the top of the compensation cabinet. The cabinets are separated by partitions, so independent air ducts are formed in the side cabinets and the middle cabinet, the air is taken in from the top and exhausted from the bottom, and the reactor and the switching unit with a large calorific value are arranged in the middle cabinet. Capacitors with low calorific value are placed in side cabinets to reduce mutual air circulation and heat exchange, reduce the temperature of the environment where the capacitors are located, protect temperature-sensitive capacitors, increase their operating stability, and prolong their life. The air is exhausted to the outside through the exhaust duct.

As a further optimization scheme of the present invention, the upper ends of the two telescopic rods are respectively connected to rollers through axles, and the rollers are arranged on the vertical guide rails on the fixed frame and the movable frame. The movement of the telescopic rod during the stretching process of the telescopic mechanism is guided by the vertical guide rail.

As a further optimization scheme of the utility model, the fan is an axial flow fan connected to the power supply through a switch.

As a further optimization solution of the utility model, a tension spring is provided between the two telescopic rods, and the reset of the pulling installation plate is realized through the energy storage and energy release of the tension spring.

A compensation system for a three-phase unbalance compensation device, including a reactive power compensation controller connected to a switching unit, the reactive power compensation controller collects three-phase power supply for sampling, and then obtains the real-time power factor of the current power grid through certain calculations. This power factor is compared with the set input threshold and cut-off threshold, and the switching unit is controlled to connect or disconnect the capacitor.

The beneficial effects of the utility model are:

1) The utility model divides the space in the compensation cabinet, and the capacitor is independently installed in the side cabinet to avoid heat exchange during air cooling, thereby effectively reducing the temperature of the environment where the capacitor is located and prolonging the service life of the capacitor;

2) The capacitor of the utility model is installed through a pulling mechanism, which can be manually pulled out of the cabinet, which is convenient for installation and maintenance.

Description of drawings

Fig. 1 is the structural representation of the utility model among the embodiment one;

Fig. 2 is a schematic structural view of the pulling mechanism of the present invention in Embodiment 1;

Fig. 3 is a side view 1 of the telescoping mechanism of the present utility model in the first embodiment;

Fig. 4 is the second side view of the telescoping mechanism of the present utility model in the first embodiment;

Fig. 5 is a structural schematic diagram of the telescoping mechanism of the present invention in the second embodiment.

In the figure: 1 compensation cabinet, 2 side cabinets, 3 middle cabinets, 4 partitions, 5 capacitors, 6 reactors, 7 switching units, 8 telescopic mechanisms, 9 pull-out mounting plates, 10 telescopic rods, 11 fixed frames, 12 Movable frame, 13 guide wheels, 14 pull-out guide rails, 15 fixed mounting plates, 16 air covers, 21 extension springs.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.

In describing the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" , "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the utility model; in the description of the utility model, unless otherwise stated, "plurality", "Several" means two or more.

Embodiment one

As shown in Figure 1-4, a three-phase unbalance compensation device includes a compensation cabinet 1, the compensation cabinet 1 is equipped with a side cabinet 2 and a middle cabinet 3, and the side cabinet 2 and the middle cabinet 3 are separated by a partition 4 separated, the side cabinet 2 is provided with a capacitor 5, the reactor 6 and the switching unit 7 are provided in the middle cabinet 3, the switching unit 7 is provided on the drawing installation plate 9 of the drawing mechanism, and the drawing mechanism includes a telescopic Mechanism 8 and the pull-out mounting plate 9 connected thereto, the telescopic mechanism 8 includes two telescopic rods 10 arranged crosswise, the two telescopic rods 10 are hinged by pin shafts, the lower end of one telescopic rod 10 is hinged with the fixed frame 11, and the other The lower end of the telescopic rod 10 is hinged with the movable frame 12, the bottom of the movable frame 12 is provided with a guide wheel 13, and the guide wheel 13 is arranged on the drawing guide rail 14, the drawing guide rail 14 is fixedly connected to the compensation cabinet 1, and the fixed frame 11 is fixedly connected to the compensation cabinet The inner walls of both sides of 1; the telescopic rod 10 can rotate at the hinged position, and when the drawing installation plate 9 is pulled out, the telescopic rod 10 is driven to rotate, thereby making the telescopic mechanism 8 shrink, and when the drawing installation plate 9 is put back along the drawing guide rail 14 It will also drive the telescopic rod 10 to reset, so that the telescopic mechanism 8 is launched; the drawing structure of the drawing installation plate 9 greatly facilitates the installation and maintenance of the capacitor 5, and the structure is stable.

The reactor 6 and the switching unit 7 are arranged on the fixed mounting plate 15, and the fixed mounting plate 15 is fixedly connected with the partition plate 4;

The top of the compensation cabinet 1 is provided with a windshield 16, the top of the windshield is provided with an air inlet, and a fan is arranged in the air inlet, and the tops of the side cabinet 2 and the middle cabinet 3 are respectively provided with an opening communicating with the inside of the windshield, and the side cabinet 2 and the lower part of the middle cabinet 3 are provided with an air outlet, and the air outlet is connected to the exhaust pipe; the air enters the wind cover through the action of the fan, and then enters the side cabinet 2 and the middle cabinet 3 through the opening on the top of the compensation cabinet 1. The middle cabinets 3 are separated by partition boards 4, so independent air passages are formed in the side cabinets 2 and the middle cabinet 3, the top intake air is exhausted from the bottom, and the reactor 6 with a large calorific value and the switching unit 7 is set in the middle cabinet 3, and the capacitor 5 with a small calorific value is set in the side cabinet 2, which reduces the air circulation and heat exchange between each other, reduces the temperature of the environment where the capacitor 5 is located, and protects the temperature-sensitive capacitor 5, Increase the stability of its operation, prolong its life, and finally the air is exhausted to the outside through the exhaust pipe.

As mentioned above, the upper ends of the two telescopic rods 10 are respectively connected to the rollers through the axles, and the rollers are arranged on the vertical guide rails on the fixed frame 11 and the movable frame 12 . The movement of the telescopic rod 10 during the telescoping process of the telescopic mechanism 8 is guided by the vertical guide rail.

As mentioned above, the fan is an axial flow fan connected to the power supply through a switch.

As mentioned above, the telescoping mechanisms 8 of multiple sets of drawing mechanisms in the side cabinet 2 share the same fixing frame 11 .

A compensation system for a three-phase unbalance compensation device, including a reactive power compensation controller connected to the switching unit 7, the reactive power compensation controller collects three-phase power supply for sampling, and then obtains the real-time power factor of the current power grid through certain calculations . This power factor is compared with the set input threshold and cut-off threshold, and the switching unit 7 is controlled to connect or disconnect the capacitor 5 .

It should be noted that the switching unit 7, reactor 6, capacitor 5 and reactive power compensation controller in the above-mentioned device and system are all existing mature equipment, and their structure, principle and connection will not be described here. The reactive power compensation control The connection between the switch and the switching unit 7 is also a prior art, and will not be described in detail here.

The above-mentioned dividing plate 4 is provided with a line hole for the passage of lines.

Embodiment two

As shown in FIG. 5 , the difference from the first embodiment is that a tension spring 21 is provided between the two telescopic rods 10 , and the reset of the pull-out mounting plate 9 is realized through the energy storage and release of the tension spring 21 .

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (6)

1. a kind of three-phase imbalance compensation device, including compensating cabinet, it is characterised in that: be equipped with sidecar inside the compensating cabinet in Between cabinet, be separated by partition between sidecar and middle cabinet, capacitor be equipped in sidecar, reactor and switching unit are set to middle cabinet Interior, switching unit is set on the pull mounting plate of pull-out mechanism, and pull-out mechanism includes telescoping mechanism and and pumping connected to it Mounting plate is drawn, telescoping mechanism includes two telescopic rods arranged in a crossed manner, and two telescopic rods are hinged by pin shaft, telescopic rod Lower end is hinged with fixed frame, and the lower end of another telescopic rod and adjustable shelf are hinged, and the bottom of adjustable shelf is equipped with directive wheel, directive wheel In pull guide, pull guide is connected compensating cabinet, and fixed frame is fixedly connected with the two sides inner wall of compensating cabinet；Reactor and switching Unit is set in fixed mounting plate, and fixed mounting plate is connected partition.

2. a kind of three-phase imbalance compensation device according to claim 1, it is characterised in that: set at the top of the compensating cabinet There is a fan housing, the top of fan housing is equipped with air inlet, and blower is equipped in air inlet, is respectively equipped at the top of sidecar and middle cabinet and fan housing The lower part of the opening of inside connection, sidecar and middle cabinet is provided with air outlet, and air outlet connects air-exhausting duct.

3. a kind of three-phase imbalance compensation device according to claim 1, it is characterised in that: described two telescopic rods it is upper Respectively by wheel axis connection idler wheel, idler wheel is set on the upright guide rail on fixed frame and adjustable shelf at end.

4. a kind of three-phase imbalance compensation device according to claim 2, it is characterised in that: the blower is axis stream wind Machine connects power supply by switch.

5. a kind of three-phase imbalance compensation device according to claim 1, it is characterised in that: between described two telescopic rods Equipped with tension spring.

6. the compensation system of a three-phase imbalance compensation device as claimed in claims 1-5, which is characterized in that including with switching Unit connects idle compensating control, and idle compensating control acquisition three phase mains is sampled.