CN204835513U - Voltage type arc light protection device - Google Patents

Abstract

The utility model relates to the field of electric safety, and discloses a voltage-type arc protection device, which comprises a low-voltage detection unit (1), which is used to detect the bus voltage during a short circuit, and sends out a first signal; an arc light sensor (2) ), used to detect the instantaneously increased light intensity, and send a second signal; and a judging device (3), connected with the low voltage detection unit (1) and the arc light sensor (2), for receiving at the same time When the first signal from the low voltage detection unit (1) and the second signal from the arc light sensor (2) are received, a third signal for controlling the disconnection of the incoming line switch is sent out. The utility model provides a voltage-type arc protection device to ensure the sensitivity, selectivity and instantaneousness of the arc protection, simplifies the electrical circuit of the protection, improves the reliability of the arc protection, eliminates the protection dead zone, and reduces the investment and cost at the same time. Operating costs.

Description

Voltage type arc protection device

technical field

The utility model relates to electrical safety, in particular to a voltage type arc protection device.

Background technique

In the medium and low voltage power supply and power consumption system, the main electrical protection of the busbar with instantaneous action has been in a blank state, and all the overcurrent delay protection devices are installed. When the electrical equipment of the busbar system fails, due to the overcurrent delay protection The device cannot remove the fault instantaneously, which often causes serious damage to electrical equipment and power failure accidents. If people pass near the faulty equipment, it may also cause casualties.

Although current-type arc protection is relatively mature, it still has the disadvantages of protection dead zone and complex electrical circuit. The protection dead zone of the current-type arc protection is the area between the current transformer of the incoming line switch and the incoming line switch and between the incoming line switch and the outlet terminal of the power supply transformer.

Due to the arc protection between the current transformer of the working (or standby) incoming line switch and the working (or standby) incoming line switch, the arc protection between the working (or standby) incoming line switch and the outlet terminal of the working (or standby) power supply transformer They must be opened with their corresponding upper-level overcurrent signals to protect the area, so the electrical circuit is complicated and increases a lot of investment, and reduces the sensitivity and reliability of arc protection, so basically no Arranging arc protection in this part of the area means that there is a protection dead zone, which itself has a great potential safety hazard.

Utility model content

The purpose of this utility model is to provide a voltage-type arc protection device, which ensures the sensitivity, selectivity and instantaneousness of arc protection, simplifies the electrical circuit of protection, and improves the reliability of arc protection , Eliminate the protection dead zone, while reducing investment and operating costs.

In order to achieve the above purpose, the utility model provides a voltage-type arc protection device, which includes: a low voltage detection unit, used to detect the bus voltage during a short circuit, and send out a first signal; an arc sensor, used to detect instantaneous increase the light intensity, and send a second signal; and a judging device, connected to the low voltage detection unit and the arc light sensor, for receiving the first signal from the low voltage detection unit and the arc light sensor at the same time The second signal of the arc light sensor sends out the third signal for controlling the disconnection of the incoming line switch.

Preferably, the arc light sensor includes a light sensing element.

Preferably, the photosensitive element is a photoresistor.

Preferably, both ends of the low voltage detection unit are connected to both ends of any one of the multiple bus bars, and are connected in parallel with any one of the multiple bus bars.

Preferably, the protection device further includes an incoming line switch control loop, the judging device is connected to the incoming line switch control loop, and the incoming line switch control loop disconnects the incoming line switch after receiving the third signal from the judging device .

Preferably, the arc light sensor is placed adjacent to electrical equipment.

Through the above technical solution, the voltage-type arc protection device provided by the utility model is used to detect the bus voltage when the short circuit is detected by the low voltage detection unit, and the arc light is detected by the arc light sensor. When the short circuit is detected, the bus voltage decreases and light is generated , the judging device controls the incoming line switch control loop to disconnect the incoming line switch.

The voltage type arc protection device ensures the sensitivity, selectivity and instantaneity of arc protection, simplifies the electrical circuit of protection, improves the reliability of arc protection, eliminates the protection dead zone, and reduces investment and operation costs.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a structural schematic diagram of a voltage-type arc protection device provided by the utility model.

Explanation of reference signs

1 Low voltage detection unit 2 Arc light sensor

3 judging device

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

Fig. 1 is a structural schematic diagram of a voltage-type arc protection device provided by the utility model. As shown in Figure 1, a voltage-type arc protection device, the protection device includes: a low-voltage detection unit (1), used to detect the bus voltage during a short circuit, and send a first signal; an arc light sensor (2), used To detect the instantaneously increased light intensity, and send a second signal; and a judging device (3), connected with the low voltage detection unit (1) and the arc light sensor (2), for receiving signals from the arc sensor (2) at the same time When the first signal of the low voltage detection unit (1) and the second signal of the arc light sensor (2) are used, the third signal for controlling the disconnection of the incoming line switch is sent out.

When a short-circuit fault occurs in the electrical equipment, arc light will be generated. At this time, the arc light sensor (2) will detect the instantaneously changing light intensity and send out a second signal. The arc light sensor (2) is a device that converts light signals into high potential (or switching) signals by using light sensing elements, and includes light sensing elements such as photoresistors. Usually the arc light sensor (2) can adjust the sensitivity to light. In the utility model, the sensitivity of the arc light sensor (2) to light can be appropriately increased to improve the sensitivity of the voltage type arc light protection device.

Although the sensitivity of the arc light sensor (2) to light can be adjusted, it is still impossible to completely prevent the arc light sensor (2) from acting on lights other than arc light. Therefore, a low voltage detection unit (1) is additionally provided. It is used to detect the bus voltage during short circuit. When a short circuit fault occurs in the electrical equipment, the bus voltage will decrease. The low voltage detection unit (1) will only act when it detects a sufficiently low voltage at this time, and send out the first signal. It will not act when the voltage is high, so the judging device (3) sends a control switch when receiving the second signal sent by the arc light sensor (2) and the first signal sent by the low voltage detection unit (1) at the same time. The disconnected third signal causes the bus bar or power unit to be powered off, thereby achieving the purpose of protecting electrical equipment, personnel safety and reliable operation of the power system. The judging device (3) is an AND gate.

The judging device (3) of the protection device is connected with the incoming line switch control circuit, and the incoming line switch control circuit disconnects the incoming line switch after receiving the third signal from the judging device (3).

The arc light protection between the current transformer of the working incoming line switch and the working incoming line switch, and the arc light protection between the working incoming line switch and the outlet terminal of the working power supply transformer can be protected by the voltage type arc light protection device provided by the utility model at the same time, and Electrical equipment such as a backup incoming line switch, a backup power supply transformer, etc. can also use the voltage-type arc protection device provided by the utility model, which will not be repeated here.

Through the above technical solution, the voltage-type arc protection device provided by the utility model is used to detect the bus voltage when the short circuit is detected by the low voltage detection unit, and the arc light is detected by the arc light sensor. , the judging device controls the incoming line switch control loop to disconnect the incoming line switch.

The voltage type arc protection device ensures the sensitivity, selectivity and instantaneity of arc protection, simplifies the electrical circuit of protection, improves the reliability of arc protection, eliminates the protection dead zone, and reduces investment and operation costs.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment, and within the scope of the technical concept of the utility model, the technical solution of the utility model can be carried out in many ways. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be explained separately.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (6)

1. A voltage type arc protection device, characterized in that the protection device comprises: A low-voltage detection unit (1), used to detect the bus voltage during a short circuit and send out a first signal; an arc light sensor (2) for detecting a momentary increase in light intensity and sending a second signal; and A judging device (3), connected to the low voltage detection unit (1) and the arc light sensor (2), for simultaneously receiving the first signal from the low voltage detection unit (1) and the The second signal of the arc light sensor (2) sends out the third signal for controlling the disconnection of the incoming line switch. 2. The voltage type arc protection device according to claim 1, characterized in that the arc light sensor (2) comprises a light sensing element. 3. The voltage type arc protection device according to claim 2, characterized in that the photosensitive element is a photoresistor. 4. The voltage-type arc protection device according to claim 1, characterized in that, the two ends of the low-voltage detection unit (1) are connected to the two ends of any one of the multiple bus bars, and are connected to any of the multiple bus bars. One in parallel. 5. The voltage-type arc protection device according to claim 1, characterized in that, the protection device also includes an incoming line switch control loop, the judging device (3) is connected to the incoming line switch control loop, and the incoming line switch After the control circuit receives the third signal from the judging device (3), the incoming line switch is disconnected. 6. The voltage-type arc protection device according to claim 1, characterized in that the arc sensor (2) is placed adjacent to electrical equipment.