CN201440575U - Low voltage distribution transformer fuse box with reactive power compensation - Google Patents

Abstract

A low-voltage distribution transformer fuse box with reactive power compensation, including a fuse box body, and two compartments at the front and rear are arranged in the box, and a knife-melt isolating switch, a load tester, and several lightning arresters are installed in the front compartment , A number of current transformers and connection terminals, the load tester and connection terminals are set at the upper left of the front compartment, the knife fuse isolating switch is set at the upper right of the front compartment, and the lightning arrester is set at the lower left of the front compartment, The current transformer is set at the lower right of the front compartment; the rear compartment is equipped with a regulated power supply, a transformer alarm, an automatic compensation controller, a knife fuse switch, several fuses, several composite switches, and several capacitive overcurrent protectors And several capacitors, regulated power supply, transformer alarm device, automatic compensation controller and knife fuse switch are arranged side by side above the rear compartment. Below the rear format, electrical connections are made between the components inside the box.

Description

Low voltage distribution transformer fuse box with reactive power compensation

【Technical field】

The utility model relates to a low-voltage distribution device, in particular to a low-voltage distribution transformer fuse box with reactive power compensation.

【Background technique】

In recent years, with the rapid development of my country's industry, some high-power nonlinear loads are increasing, and the impact on the power grid and harmonic pollution are also on the rise. Due to the lack of reactive power adjustment means, the bus voltage varies greatly with the operation mode, causing various power quality problems.

With the increasingly strong requirements for the modernization of power distribution management in various power supply companies, the measurement, analysis and statistics of distribution transformer operating parameters are realized through comprehensive power distribution monitoring devices, and the automatic compensation and optimization of distribution reactive power and voltage are realized through low-voltage reactive power compensation devices. The method of reducing the power loss of distribution network, improving the utilization rate of power distribution equipment, and improving the power quality of power distribution to a certain extent has been generally recognized and highly valued. In order to ensure the reliability, high quality and high efficiency of power supply, dynamic reactive power compensation technology has been adopted in various countries.

The low-voltage power distribution monitoring and reactive power compensation box commonly used at present is assembled in an outdoor equipment box by a comprehensive power distribution measurement and control device, several low-voltage power capacitors, switches for switching low-voltage power capacitors, and some protection components. , its products are large in size, complicated in wiring, poor in maintainability, and simple in function. It is difficult to realize a relatively complete fault self-diagnosis function and three-phase current protection and temperature protection of each capacitor through modern technical means, which causes serious damage to operation and maintenance work. Great inconvenience.

【Content of utility model】

In order to solve the above problems in the prior art, the utility model provides a low-voltage distribution transformer fuse box with reactive power compensation. The low-voltage distribution transformer fuse box with reactive power compensation is small in size, reasonable in internal layout, and Simple and easy to maintain, it is more conducive to the expansion of the configuration scheme and the operation of the staff.

The technical scheme that the utility model takes is as follows:

A low-voltage distribution transformer fuse box with reactive power compensation, comprising a fuse box body, the fuse box body is provided with two compartments at the front and rear, the front compartment is provided with a knife-melt isolating switch, Load test recorder, several lightning arresters, several current transformers and connection terminals, the load test recorder and connection terminals are arranged at the upper left of the front compartment, the knife fuse isolating switch is arranged at the upper right of the front compartment, and the lightning arrester Set the lower left of the front compartment, and the current transformer is set at the lower right of the front compartment; the rear compartment is equipped with a regulated power supply, a transformer alarm, an automatic compensation controller, a knife fuse switch, and several fuses , several compound switches, some capacitive overcurrent protectors and some capacitors, and the stabilized power supply, transformer alarm device, automatic compensation controller and knife melting switch are arranged side by side above the rear compartment in sequence, and the fuses, compound switches, capacitors Overcurrent protectors and capacitors are arranged sequentially under the rear format from top to bottom, and the components in the box are electrically connected.

The knife fuse isolating switch provided in the front compartment of the fuse box is equipped with a knife fuse seat for the isolating switch.

The knife fuse isolating switch installed in the front compartment of the fuse box is equipped with an arc shield between phases.

The knife fuse isolating switch provided in the front compartment of the fuse box is equipped with a wide-band contact surface type static contact.

The capacitance automatic compensation in the fuse box box adopts two compensation methods: single-phase separate compensation and three-phase co-compensation, wherein the co-compensation switch is used for switching three-phase capacitors, and the Δ connection method is used; the sub-compensation switch is used for switching Single-phase capacitors are connected in Y shape.

The beneficial effect of the utility model is that, on the basis of the function of the existing low-voltage distribution transformer fuse box, a reactive power compensation control and capacitance compensation device is added, so that the function of the low-voltage distribution transformer fuse box is broken through and extended. The low-voltage distribution transformer fuse box with reactive power compensation of the utility model integrates the functions of switch box, overcurrent protection, lightning strike protection, overvoltage protection, undervoltage protection, wire theft alarm, reactive power compensation, etc., and has a wide range of functions. The application prospect is convenient for the operation and maintenance of the staff.

【Description of drawings】

Fig. 1 is a schematic diagram of the layout of the front compartment of the low-voltage distribution transformer fuse box with reactive power compensation of the present invention;

Fig. 2 is a schematic diagram of the layout of the rear compartment of the low-voltage distribution transformer fuse box with reactive power compensation of the present invention;

Fig. 3 is a schematic diagram of the wiring principle of the primary circuit of the present invention.

The reference signs and components involved in the figure are as follows:

1. Knife fuse isolating switch 2. Load test recorder

3. Automatic compensation controller 4. Current transformer

5. Terminal block 6. Transformer alarm device

7. Composite switch 8. Capacitor overcurrent protector

9. Capacitor 10. Knife fuse seat for isolating switch

11. Arc barriers between phases 12. Broad-band contact surface type static contacts

13. Lightning arrester 14. Fuse

15. Regulated power supply 16. Speaker

17. Knife fuse switch

【Detailed ways】

Below in conjunction with embodiment and with reference to accompanying drawing, the utility model is further described:

Referring to Figures 1 and 2, a low-voltage distribution transformer fuse box with reactive power compensation includes a fuse box body, and the fuse box body is provided with two compartments at the front and rear, and the front compartment It is provided with a knife melting isolating switch 1, a load measuring instrument 2, several lightning arresters 13, several current transformers 4 and connecting terminals 5. The melting isolating switch 1 is arranged on the upper right of the front compartment, the lightning arrester 13 is arranged on the lower left of the front compartment, and the current transformer 4 is arranged on the lower right of the front compartment; a stabilized power supply is arranged in the rear compartment 15. Transformer alarm device 6, automatic compensation controller 3, knife fuse switch 17, several fuses 14, several composite switches 7, several capacitive overcurrent protectors 8 and several capacitors 9, the regulated power supply 15, transformer alarm device 6. The automatic compensation controller 3 and the knife fuse switch 17 are arranged side by side above the rear compartment in sequence, and the fuse 14, composite switch 7, capacitive overcurrent protector 8 and capacitor 9 are arranged sequentially below the rear compartment from top to bottom , In this specific embodiment, a speaker 16 is also included, and the components in the box are electrically connected.

In addition, in order to improve the electrical properties and safety of the low-voltage distribution transformer fuse box with reactive power compensation, in this specific embodiment, the knife-fuse isolating switch 1 installed in the front compartment of the fuse box box is also equipped with an isolating switch Use the knife melting seat 10, the arc barrier 11 between the phases and the broadband contact surface type static contact 12.

Referring to Fig. 3, it is a schematic diagram of the primary line wiring principle of the present invention, wherein the automatic compensation of the capacitance in the fuse box adopts two compensation methods: single-phase separate compensation and three-phase co-compensation, and the co-compensation switch is used for switching three phases The phase capacitance adopts the Δ connection method; the sub-compensation switch is used for switching single-phase capacitance and adopts the Y-shaped connection method.

The low-voltage distribution transformer fuse box with no power compensation of the utility model is used as a new type of energy-saving and intelligent power distribution equipment for the outlet of the distribution transformer on the column. The non-power compensation control and capacitor supplementary device make the distribution transformer fuse box compact, reasonable in structure, easy to maintain and simple to operate.

The above is only a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the concept of the present utility model. Should be regarded as within the protection scope of the present utility model.

Claims (5)

1. A low-voltage distribution transformer fuse box with reactive power compensation, comprising a fuse box body, characterized in that, the fuse box body is provided with two compartments at the front and rear, and the front compartment is provided with There are knife-melt isolating switch, load tester, several lightning arresters, some current transformers and connecting terminals. The lightning arrester is set on the lower left of the front compartment, and the current transformer is set on the lower right of the front compartment; the rear compartment is equipped with a regulated power supply, a transformer alarm, an automatic compensation controller, a knife Melting switch, fuse, composite switch, capacitive overcurrent protector and capacitor, the stabilized power supply, transformer alarm, automatic compensation controller and knife melting switch are arranged side by side above the rear compartment in sequence, and the fuse, composite switch , Capacitive overcurrent protector and capacitors are arranged in turn below the rear format from top to bottom, and the components in the box are electrically connected. 2. The low-voltage distribution transformer fuse box with reactive power compensation according to claim 1, characterized in that, the knife fuse isolating switch provided in the front compartment of the fuse box is equipped with a knife fuse seat for the isolating switch . 3. The low-voltage distribution transformer fuse box with reactive power compensation according to claim 1, characterized in that, the knife-melt isolating switch provided in the front compartment of the fuse box box is equipped with a phase-to-phase switch. Arc barrier. 4. The low-voltage distribution transformer fuse box with reactive power compensation according to claim 1, characterized in that, the knife-melt isolating switch provided in the front compartment of the fuse box is equipped with a wide-band contact surface type static switch. contacts. 5. The low-voltage distribution transformer fuse box with reactive power compensation according to claim 1, characterized in that, the automatic compensation of capacitance in the fuse box box adopts two compensation methods: single-phase separate compensation and three-phase co-compensation , where the common compensation switch is used for switching three-phase capacitors, using the △ connection method; the sub-compensation switch is used for switching single-phase capacitors, using the Y-shaped connection method.

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