Voltage loss network outage locking device

Abstract

The invention relates to a voltage loss network outage locking device. The voltage loss network outage locking device is characterized by comprising a power supply module, a control circuit, a voltagedetection module, a grounding wire, a grounding resistor R, a first switch K1 and a second switch K2; the power supply module supplies power to the voltage monitoring module and the control circuit;the second switch K2 and the grounding resistor R are arranged on the grounding wire; the upper end of the grounding wire is electrically connected with a user photovoltaic power line; the lower end of the grounding wire is grounded; the first switch K1 is installed on the user photovoltaic power line; the control end of the first switch K1 is connected with a first control port of the control circuit; the control end of the second switch K2 is connected with a second control port of the control circuit; the acquisition end of the voltage monitoring module is electrically connected with the user photovoltaic power line; and the signal output end of the voltage monitoring module is connected with the signal input end of the control circuit. The device disclosed by the invention has the function of releasing energy in voltage loss network outage.

Description

technical field [0001] The invention relates to a locking device for voltage loss and network disconnection. Background technique [0002] The household access scheme of the low-voltage public power grid requires the installation of an anti-islanding device on the low-voltage side of the distribution transformer. Through the device, the selection and switching of the low-voltage outgoing lines of the low-voltage integrated distribution box and the electrical blocking function are realized to prevent the maintenance of the public transformer station area. During construction, photovoltaic power supply reverses power transmission. [0003] However, according to the results of actual on-site investigations and hidden dangers in daily operation and maintenance, it is found that the installation of anti-islanding devices has the following limitations: [0004] 1. At present, the existing anti-islanding device in the power grid is only used on the low-voltage power distribution s...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, the existing anti-islanding device in the power grid is only used on the low-voltage power distribution side of the station area, and can only prevent the low-voltage distribution network from sending power back to the high-voltage power grid. The reverse power transmission can only be controlled by the user pulling the combined network switch (knife switch), and unified management and intelligent control cannot be carried out

Moreover, the existing anti-islanding device is expensive, bulky, and requires high installation and maintenance, and cannot be widely used in low-voltage photovoltaic power generation users and users with self-provided power supplies for anti-reverse power transmission.

[0005] 2. After the user-side anti-islanding device is put into operation, the power supply company has neither the obligation to periodically verify the performance of the anti-islanding device, nor does the user have the awareness of maintaining grid security

This type of equipment does not belong to the scope of the whole life cycle management of metering. The lack of routine inspection of the device will make it difficult to control the failure of the device in time. Safety and security of distribution network operating equipment causing harm

[0006] 3. With the vigorous promotion of the National Distributed Photovoltaic Poverty Alleviation Project, the number of low-voltage photovoltaic power supply users connected to public substation areas has doubled year by year. The normal operation of the anti-islanding device is particularly important, but the device does not have remote centralized control function of

The whole process is not only time-consuming and labor-intensive, but also increases the length of power outage maintenance and the risk of user complaints, and because the locking measures cannot be effectively implemented, safety risk control can only be carried out by hanging signs, which cannot effectively prevent and control low-voltage photovoltaic power supply and user-provided Electric shock safety risk of power feedback

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