CN104283221A - Low-voltage reactive power compensation device - Google Patents

Abstract

The low-voltage reactive power compensation device of the present invention includes a box body, a control panel is arranged on the front of the box body, a knife melting switch is arranged in the box, the input end of the knife melting switch is connected to a controller, and the knife melting switch The three output ends of the battery are respectively connected to a copper bar through a current transformer, and each copper bar is connected to 6 smart capacitors and two harmonic suppression capacitors through copper core wires, and the output end of the smart capacitor is connected to the zero row. The device utilizes the isolation and protection functions of the knife fuse switch and the buffering effect of the copper bar to greatly improve the safety and stability of the compensation device; the addition of harmonic suppression capacitors can filter and eliminate harmonics in the power system, greatly Improve the quality of power grid power; through the temperature and humidity controller and fan, the intelligent control of the temperature and humidity in the box can be realized, which ensures the operating status of the equipment in the box and prolongs the service life of the equipment.

Description

Low-voltage reactive power compensation device

technical field

The invention relates to a compensation device, in particular to a low-voltage reactive power compensation device.

Background technique

At this stage, the reactive power compensation devices used by most factories and enterprises are composed of fuses, contactors, thermal relays, capacitors, etc., which are assembled and connected with wires in sequence, and have no harmonic suppression function. Automatically control the pull-in of the contactor to control the switching of the capacitor. Since the frequency of automatic switching is high, the pull-in frequency of the contactor is high. If there is a harmonic source, the probability of burning out is very high. big.

Contents of the invention

In order to solve the above problems, the present invention provides a low-voltage reactive power compensation device, which solves the problems of low reliability and easy damage of existing devices.

The present invention adopts the following technical solutions: the low-voltage reactive power compensation device includes a box body, and a control panel is provided on the front of the box body. The control panel includes a display screen, a controller, buttons, a current and voltage meter, and a voltage conversion switch. That is, a knife fuse switch is provided in the box, the input terminal of the knife fuse switch is connected to the controller, and the three output terminals of the knife fuse switch are respectively connected to a copper bar through a current transformer, and each A copper bar is connected to 6 smart capacitors and two harmonic suppression capacitors respectively through copper core wires, and the output terminal of the smart capacitor is connected to the zero row.

Further, the copper core wire used for connecting the copper bar and the two harmonic suppression capacitors is a BVR copper core wire with a diameter of 25 mm.

Further, the copper core wire used for connecting the copper bar and the six smart capacitors is a BVR copper core wire with a diameter of 35 mm.

Further, the control panel also includes a temperature and humidity controller, a fan is arranged on the rear side of the box, a temperature sensor and a humidity sensor are arranged in the box, and the fan, the temperature sensor and the humidity sensor Connect with the temperature and humidity controller respectively.

The beneficial effects of the present invention are:

1. By setting the knife melting switch and the copper bar, the safety and stability of the compensation device are greatly improved by using the isolation and protection function of the knife melting switch and the buffering effect of the copper bar. Even if the harmonic suppression capacitor is added, The compensation device can still ensure long-term stable operation, and the harmonic suppression capacitor is equipped with a reactor, which can filter and eliminate harmonics in the power system and greatly improve the quality of power grid power.

2. The temperature inside the cabinet is measured in real time by the temperature sensor and the humidity sensor, and the intelligent control of the temperature and humidity inside the cabinet is realized by using the temperature and humidity controller and the fan, which ensures the operation status of the equipment inside the cabinet and prolongs the service life of the equipment.

Description of drawings

Fig. 1 is a schematic diagram of the internal main view structure of the cabinet of the present invention;

Fig. 2 is a schematic diagram of the internal rear view structure of the cabinet of the present invention;

Fig. 3 is the schematic diagram of circuit control of the present invention.

In the figure: 1 cabinet, 2 control panel, 3 knife melting switch, 4 current transformer, 5 copper bar, 6 copper core wire, 7 smart capacitor, 8 harmonic suppression capacitor.

Detailed ways

The low-voltage reactive power compensation device shown in Figure 1 and Figure 2 includes a box body 1, a fan is arranged on the rear side of the box body, and a control panel 2 is arranged on the front side of the box body, and the control panel 2 includes a display screen , controller, buttons, current and voltmeter, voltage conversion switch, temperature and humidity controller, said box body 1 is provided with temperature sensor, humidity sensor, knife melting switch 3, and said fan, temperature sensor and humidity sensor are respectively Connect with the temperature and humidity controller, the input end of the knife melting switch 3 is connected to the controller, and the three output ends of the knife melting switch are respectively connected to a copper bar 5 through a current transformer 4, each copper bar 5 Connect with six intelligent capacitors 7 and two harmonic suppression capacitors 8 respectively through copper core wire 6, the output end of intelligent capacitor connects zero row, wherein, the copper core wire used for connecting copper row and two harmonic suppression capacitors is diameter 25 mm BVR copper core wire, the copper core wire used to connect the copper bar and 6 smart capacitors is a BVR copper core wire with a diameter of 35 mm.

When in use, the controller realizes man-machine interconnection through the controller and buttons in the control panel. As shown in Figure 3, the capacitors 1CA-9CA are used in the network. After connecting with the RS485 communication cable, they will automatically form a queue with the controller online. The switching state of the capacitor can be viewed and controlled manually through the controller, or it can be automatically switched according to the controlled physical quantities such as reactive power, reactive current, power factor, voltage, and time period. Circular switching, capacitors with different capacities are switched in the way of reactive power shortage selection.

During the entire switching process, the temperature sensor and humidity sensor detect the temperature and humidity in the cabinet in real time, and the temperature and humidity controller controls the operation of the fan to realize the regulation of the temperature and humidity in the cabinet.

Except the structure described in the present invention, all the others are prior art.

The above is only a preferred embodiment of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered as the present invention. protection scope of the invention.

Claims (4)

1. The low-voltage reactive power compensation device comprises a box body, and a control panel is provided on the front side of the box body, and the control panel includes a display screen, a controller, buttons, a current and voltage meter, and a voltage conversion switch, and it is characterized in that the There is a knife melting switch in the box, the input end of the knife melting switch is connected to the controller, and the three output ends of the knife melting switch are respectively connected to a copper bar through a current transformer, and each copper bar passes through a copper The core wires are respectively connected to 6 smart capacitors and two harmonic suppression capacitors, and the output terminals of the smart capacitors are connected to the zero row. 2. The low-voltage reactive power compensation device according to claim 1, characterized in that, the copper core wire used to connect the copper bar and the two harmonic suppression capacitors is a BVR copper core wire with a diameter of 25 mm. 3. The low-voltage reactive power compensation device according to claim 1, characterized in that, the copper core wire used to connect the copper bar and the six smart capacitors is a BVR copper core wire with a diameter of 35 mm. 4. The low-voltage reactive power compensation device according to any one of claims 1-3, characterized in that, the control panel also includes a temperature and humidity controller, and a fan is arranged on the rear side of the box, and the A temperature sensor and a humidity sensor are arranged in the box, and the fan, the temperature sensor and the humidity sensor are respectively connected with the temperature and humidity controller.