Local rapid isolation implementation method

Abstract

The invention discloses a local rapid isolation implementation method, and the method comprises the steps that a first intelligent device enables an optical fiber to serve as a channel so as to transmit a current to a second intelligent device; the first intelligent device is connected with the second intelligent device through an optical fiber; the first intelligent device calculates the value of the current in the channel through employing a full-wave Fourier algorithm, enables the value of the current to serve as a side collection value and transmits the side collection value to the second intelligent device through employing an optical fiber; the second intelligent device receives the transmitted current, and enables the value of the collected current to serve as a local collection value; the second intelligent device receives the side collection value, calculates and obtains a differential current through employing the side collection value and the local collection value, and judges whether a protection segment region of the first intelligent device has a fault or not according to the differential current: the second intelligent device executes optical difference protection action to get rid of the fault if the protection segment region of the first intelligent device has the fault, so as to isolate the fault. The method achieves the fast and accurate discrimination of the fault, quickly cuts off and isolates the fault, reduces the maintenance time, and achieves the recovery of power supply as quickly as possible.

Description

technical field [0001] The invention relates to the technical field of power distribution network, in particular to a method for realizing rapid local isolation. Background technique [0002] At present, the development of distribution network is proposed with the scale of urban construction, the rapid growth of power load and the reliability of power supply. Due to the separation of urban planning and power terms, an incompatible distribution network structure has been formed, making power distribution Network planning and development do not meet the needs of the city, which is highlighted in the following aspects: 1. The structure of the power grid is complex, and there are many contact points in the ring network; 2. The transformation of the urban power grid involves a wide range of areas, high requirements, and power outages are rare; 3. Urban construction is developing rapidly, load growth rate is high, power supporting construction is not timely, transmission line radi...

AI Technical Summary

Problems solved by technology

[0002] At present, the development of distribution network is proposed with the scale of urban construction, the rapid growth of power load and the reliability of power supply. Due to the separation of urban planning and power terms, an incompatible distribution network structure has been formed, making power distribution Network planning and development do not meet the needs of the city, which is highlighted in the following aspects: 1. The structure of the power grid is complex, and there are many contact points in the ring network; 2. The transformation of the urban power grid involves a wide range of areas, high requirements, and power outages are rare; 3. Urban construction is developing rapidly, load growth rate is high, power supporting construction is not timely, transmission line radius is small, line is long, "bottleneck" effect is more prominent, and power supply capacity cannot keep up; It has been in disrepair for a long time, there are many high-energy-consuming equipment, and the accident rate is high; the overall level of distribution network automation is low, and the technical support methods for distribution network dispatching operation are backward; 5. There are many station-side equipment for distribution network automation, and the communication network is complex. These problems have also brought some new problems to the relay protection device. The traditional relay protection device is greatly affected by the operation mode and system oscillation, the setting is difficult to coordinate, the protection coordination design is complicated, the power supply recovery is slow, and the fault point is not easy to determine , The number of protective devices is large

[0003] Especially for local isolation, there is currently no good method. For example, when a power supply line suddenly fails, it will cause the protection action of the incoming line circuit breaker at the power supply end to trip, resulting in a large-scale power outage in this power supply section. At this time, the other end The standby self-switching action will turn on the backup power supply and gradually restore the power supply, but because the fault has not been eliminated, when the power supply is restored to the fault point, the circuit breaker will trip again, which will cause a large impact on the circuit breaker after multiple openings and closings , may cause primary equipment damage and affect the power supply recovery time, the power outage time will be prolonged, and the fault point cannot be found quickly, and the maintenance time will also increase

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