Power grid structure for avoiding override tripping of small switch station suitable for urban residential

Abstract

The invention discloses a power grid structure for avoiding override tripping of a small switch station suitable for urban residential. The structure comprises: a junction box, a digital display, a differential relay, a magnetic seat button, a shell frame cover, a breaker square box, a storage battery box and a line cap crimping device. Through cooperation of the breaker square box and the line cap crimping device, a substation lead is inserted into a line cap shaft rod cover, when an impact current is mistakenly operated, an insulating folded plate drives a rotating eccentric wire pressing head to form a circuit breaking protection effect, a cover cap square groove of a closing contact is erected on each air switch gate of a switch station, so that a jumper switching circuit to be subjected to override tripping obtains the filtering shielding effect of closed insulation arc extinction of a pin column barrel, and an I-shaped sectional column rotates to form a sectional treatment effectof the insulating folded plate, thereby achieving the carding protection of one-to-one pipeline embedding, facilitating time division line detection during maintenance, and when the tripping is achieved, the armature frame is high in on-off attraction definition, and the safe and accurate tripping protection circuit effect of the power grid of the urban residential is guaranteed.

Description

Technical field [0001] The invention is a power grid structure suitable for small switch stations of urban residences to prevent over-level tripping, and belongs to the field of urban power grid structures. Background technique [0002] The work between substations and switchyards distributed in urban residences is provided through high-voltage line towers for power distribution, transmission and supply, which has strict requirements for the structure of the urban power grid. Switchyards are connected to the main gates and substations one by one. The high precision ensures the safety of people when they need electricity. The disadvantages of current technology to be optimized are: [0003] Because the time limit setting value of the switchyard is very small, the switchyard uses the de-shunt method to trip. Once the substation trips before the switchyard and cuts off the fault current, the switchyard switch will lose the opening current and cannot trip; , When the outgoing switch o...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a power grid structure suitable for urban residential small-scale switching stations to prevent over-level tripping, so as to solve the problem of tripping in switching stations due to the small time limit setting value of switching stations. Once the substation trips before the switch station and cuts off the fault current, the switch station switch will not trip due to the loss of opening current; at this time, the outlet switch of the substation will close on the fault line when it is reclosing. Resulting in reclosing failure, when there is a line failure in the switch station, the switch station will not trip, and the substation outlet switch will trip, causing the closing surge current to cause a false tripping phenomenon, which will also affect other switch linkages in the switch station Problems with tripping, conditions that cause circuit disturbances

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