CN2561151Y - Capacitor-embedded terminal box - Google Patents

Abstract

The utility model discloses a joint box embedded with a capacitor. The embedded capacitor joint box is made by taking the known asynchronous motor joint box as foundational model, enlarging the capacity to fill a capacitor core in the joint box; the terminal is connected with a motor terminal in parallel; the most immediate, the detailed, the closest to the motor wattless compensation natural conditions are created, the effort offering of the motor is improved, and the most economical electricity saving is achieved; the compensation of the utility model follows a load, the wattless current of the transmission line can be reduced, the over compensation and transient phenomenon of the electric network can be reduced, and a costly wattless compensator and an afterwards compensation apparatus of a wattless compensation controlling device in the electric network can be reduced; the economical efficiency of the electricity utilization is improved.

Description

Be embedded with the capacitor terminal box

The utility model belongs to the energy saving motor technical field, is the device that improves the asynchronous electric engine efficiency, specifically motor connecting cartridge type capacitor.

Constantly need electrical equipment also along with variation along with what produce, and the core of electrical equipment is a motor; In recent years interrelated data shows that China's power network accounts for maximum load (power consumption) to tool is asynchronous motor, as everybody knows: these inductive loads are in operation, need from power network, draw reactive current, set up magnetic field to supply with its stator winding, so the voltage of electrical network is reduced, electric energy loss increases, thereby has hindered the output of active power: people improve power factor (PF) in order to reduce electric energy loss at present; Power capacitor is set as reactive power compensation on grid equipment, reduces electric energy loss, improve the electricity consumption economy.And overcompensation is harmful to, though this compensation makes moderate progress to loss, root problem does not solve; Reactive power compensation should and then change along with load variations, the particularly variation of inductive load, for example: factory's underload or stop work to have a rest and just can cause the undesirable transition effect of people unavoidably.Thereby people have set up in transformer station, electrical network, electric power system, and diversified reactive-load compensator and reactive power compensation control device reduce transition effect.Just at present, people are the electricity consumption economy of monopole asynchronous motor, usually all the capacitor device of outsourcing on the body housing of motor, also the capacitor of handlebar outsourcing is assemblied in the terminal box of special increasing, therefore give the charged container of asynchronous motor (inductive load) (capacitive compensation) operation, increase trouble and increased cost and drawbacks such as overall volume and sense of insecurity, thereby the asynchronous motor ordinary practice is that not charged container moves at present, but: according to the statistics made by the departments concerned, the asynchronous motor power consumption accounts for more than 60% of national gross generation.The essential reactive current that absorbs of asynchronous motor operation reduces voltage, and electric energy loss increases, and hinders active power output: also can cause problems such as the undesirable transition effect of people owing to plant produced needs the peak of power consumption and the low ebb that produce simultaneously.

The purpose of this utility model, provide a kind of capacitor terminal box that is embedded with, it can be easily, be assemblied on the asynchronous motor,, reduce the wastage as reactive power compensation on the spot at random, reduce the reactive current of transmission line, to alleviate the power supply burden, reduce the comprehensive power loss of motor and reduce transition effect, to improve power factor and running quality; And expensive reactive-load compensator and reactive power compensation control device in the minimizing electrical network, indemnifying measure afterwards.

In order to achieve the above object, the utility model capacitor for ac motor, is made applicable to (capacitors such as flat, thin slice shape or the circle) external form that is embedded in the terminal box; Then capacitor is used the heat cured insulation material, casting is fixed on the appropriate location of (terminal box that can hold reactive-load compensation capacitor than conventional increasing) terminal box, or with additive method capacitor is fixed on the suitable orientation of terminal box, cause three-phase and monopole asynchronous motor terminal box to hold capacitor and do not hinder the function of use of terminal box; During use the parallel connection on demand of capacitor lead-out wire is connected motor winding connection end, install this terminal box, wear the natural conditions of capacitor at random, realize reactive power compensation purpose on the spot to reach asynchronous motor.

Owing to adopted such scheme, eliminated the troublesome problem when installing and fixing, provide instantaneity simultaneously, to create the natural conditions of the most economical economize on electricity of asynchronous motor; Realize asynchronous motor reactive power compensation at random, can realize naturally that the power department compensation combines, forms the compensation that can eliminate the compensating basin with user's compensation, can reduce the reactive current of transmission line, reduce electric energy loss, optimize reactive power flow, reduce inrush phenomenon, improved utilization rate of equipment and installations, improve the power of electric motor factor, reduce the electrical equipment under voltage, just load raisings of exerting oneself paid to reduce demand charge; So since it to be the switching building-out capacitor amount of the least significant end compensation of following load, the thinnest level, the branch compensation, the electricity that disperse most be the most close inductive load capacitive compensation it best compensate for ambient and the widest compensation space are arranged, she not only can compensate all lineal reactive powers, also can compensate the reactive power of first collateral line; Thereby can improve grid supply quality, reduce the overcompensation and the transition effect of electrical network; Because of its to reduce reactive-load compensator expensive in the electrical network and reactive power compensation control device, compensating device afterwards; To improve the electricity consumption economy.

Embodiment further specifies the utility model below in conjunction with accompanying drawing:

Fig. 1: be the utility model connector cover type, be embedded with capacitor terminal box embodiment schematic diagram.

Fig. 2: be the utility model junction box seat type, be embedded with capacitor terminal box embodiment schematic diagram.

Fig. 3: be the auxiliary embodiment of the utility model, threephase motor winding parallel capacitor schematic diagram.

Among the figure: 1. connector cover; 2. junction box seat; 4. capacitor termination; 5. terminal box is led to the line mouth, and it is used for the logical line of terminal box and motor; 6. junction box seat fixing hole, it is used for the hole of fixedlying connected of junction box seat and motor; 7. the terminal box entrance hole is used for power line and leads to the into entrance hole of terminal box; 8. the terminal box screw hole is used for connector cover (1) is connected usefulness with junction box seat (2) screw hole; C. compensation condenser; The Ie flow restricter; W, U, V, be three (threephase motor terminal stud) terminals; A, b, c, be respectively three phase windings, the 0th, (star connects) winding is held altogether.

Find out that in Fig. 1 the utility model is three-phase or monopole asynchronous motor connector cover (1), increasing increases volume three pairs of capacitor bodies (C) can be contained in the terminal box, and can not hinder the function of use of terminal box; Then with the technology of conventional encapsulated capacitor (as the packaging technology and the lead-out wire mode of BGMJ type self-healing low-voltage shunt capacitor, the packaging technology and the lead-out wire mode of single-phase available CBB61 type AC capacitor) capacitor (C) is used the heat cured insulation material, casting is fixed on the connector cover; Form embedded capacitor wiring hamper.Then with capacitor termination (4) with dihedral connection (Fig. 3 A) or star connection (Fig. 3 B), be connected into three lead-out wires, the centre flow restricter (Ie) of connecting, and be connected to W, U, V, three (threephase motor terminal stud) terminals of Fig. 3, realize that threephase asynchronous wears capacitor at random, (single-phase can be connected in parallel into two end points with three pairs of capacitors, also can and be connected on two terminations of motor winding with two electrode tips that embed a pair of capacitor) be the purpose of reactive power compensation on the spot; When asynchronous motor moves, supply with the reactive power of this circuit by capacitor, as the capacitive compensation of inductive load; Reduce the reactive current of transmission line, reduce the wastage, reduce the load under voltage, improve power factor; The little capacitor of the also applicable overall volume of this capacitor terminal box number is 99106700.2 publication number CN1248053A " multiple-plate energy-saving capacitor " and embeddings such as " gas-filled type shunt capacitors " as: patent Shen.

Find out that in Fig. 2 the utility model is three-phase (or single-phase) asynchronous motor junction box seat (2), widening or extending increases volume capacitor body (C) can be contained in the terminal box, and does not hinder the terminal box function of use; Described the same with Fig. 1 then, with the technology of conventional encapsulated capacitor capacitor (C) is used the heat cured insulation material, casting is fixed on the junction box seat (2), forms the embedded capacitor junction box seat; Then with the termination (4) of capacitor (C) with dihedral connection (Fig. 3 A) or star connection (Fig. 3 B), be connected into three lead-out wires, the centre flow restricter (Ie) of connecting, and being connected on W, U, the V of Fig. 3, three (threephase motor terminal stud) terminals; Realize that threephase asynchronous wears capacitor, the purpose of reactive power compensation on the spot at random; When threephase asynchronous moves, supply with the reactive power of this circuit by capacitor, as the capacitive compensation of inductive load; Reduce the reactive current of transmission line, reduce the wastage, make load terminal voltage to raise, improve power factor, because single-phase motor (master) winding has only two terminations, as long as it be embedded in a pair of capacitor body in terminal box, its two electrode tips and be connected on two terminations of motor winding, can realize that just motor wears capacitor, the purpose of reactive power compensation on the spot at random.

In Fig. 3, A is star connection winding parallel capacitor embodiment, and B is that triangle connects winding parallel capacitor embodiment, and C is the compensation condenser pole plate; Find out its star connection and delta connection all be adapted to be connected in parallel above-mentioned compensation condenser (C) (in Fig. 1, Fig. 2 to set forth) by this figure.Flow restricter (Ie) is the leading-out terminal that is connected on compensation condenser, and it limits the heavy current impact capacitor and is provided with, and can or use thermal relay with fuse on the motor relatively stably in operating mode; On the more frequent motor of actuating ratio, can use the small inductor coil.

Because it is a kind of compensation arrangement of following load variations, thus the overcompensation and the transition effect of electrical network can be reduced, to reduce reactive-load compensator expensive in the electrical network and reactive power compensation control device, indemnifying measure afterwards; Improve the power of electric motor factor, reduce the reactive current of transmission line, reduce the load under voltage, to improve motor speed and to exert oneself; Promptly improve the electricity consumption economy.

Claims (3)

1. one kind is embedded with the capacitor terminal box, it is made up of connector cover (1), junction box seat (2), the logical line mouth (5) of terminal box, junction box seat fixing hole (6), terminal box entrance hole (7), terminal box screw hole (8) etc., and it is characterized in that: this terminal box is embedded with compensation condenser (C).

2. the capacitor terminal box that is embedded with according to claim 1 is characterized in that: it is the asynchronous motor terminal box.

3. the capacitor terminal box that is embedded with according to claim 1 is characterized in that: described compensation condenser, leading-out terminal are in series with flow restricter (Ie).

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