CN115622228A - Spare power automatic switching method for 35kV line - Google Patents

Abstract

The invention relates to a spare power automatic switching method for a 35kV line, which comprises the following steps: step (1), constructing a double-end power supply grid system, wherein the grid system comprises two 220kV transformer substations and is defined as a transformer substation A and a transformer substation B; the 35kV outgoing line end on the low-voltage side of the transformer substation A and the 35kV outgoing line end on the low-voltage side of the transformer substation B are connected through a 35kV connecting line to be connected with a group of 35kV transformer substations, the 35kV connecting line is located on the 35kV outgoing line side of the low-voltage side of the transformer substation A, on the 35kV outgoing line side of the low-voltage side of the transformer substation B and on the two sides of each 35kV transformer substation, and contact switches are arranged on the two sides of each 35kV transformer substation, one contact switch is set to be an open-loop point, and the contact switch is defined as a standby switch. The invention can effectively solve the problem that the power cannot be transferred through the spare power supply in the fault process in the double-end power supply system between two 220kV transformer substations.

Description

Spare power automatic switching method for 35kV line

Technical Field

The invention relates to a spare power automatic switching method for a 35kV line.

Background

Most of the power distribution networks in China are in a radial single-loop wiring mode. When a line breaks down, a power supply needs to be cut off, short-time power failure of the branch user end can be caused, the stability of system power supply is damaged, and the requirement of a user on the continuity of the power supply cannot be met.

The local spare power automatic switching device only controls circuit breakers which are mutually standby in the substation after being installed, when a transformer substation supplies power for a single line and other spare lines supply power for cold standby, even if the local spare power automatic switching device acts, the transformer substation is still in a power failure state and needs manual operation for recovery.

It is necessary to design a method for realizing backup power switching and supply in case of failure in a double-end power supply system between two 220kV substations.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a spare power automatic switching method for a 35kV line, which solves the problem that the switching can not be realized through the spare power automatic switching in the fault process in a double-end power supply system between two 220kV transformer substations.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a spare power automatic switching method for a 35kV line comprises the following steps:

step (1), constructing a double-end power supply grid system, wherein the grid system comprises two 220kV transformer substations and is defined as a transformer substation A and a transformer substation B; a 35kV transformer substation is connected between a 35kV outlet end on a low-voltage side of the transformer substation A and a 35kV outlet end on a low-voltage side of the transformer substation B through 35kV connecting lines, the 35kV connecting lines are positioned on the 35kV outlet side of the low-voltage side of the transformer substation A, the 35kV outlet side of the low-voltage side of the transformer substation B and two sides of each 35kV transformer substation are respectively provided with a connecting switch, one connecting switch is set as an open loop point and is defined as a standby switch;

defining a power supply line from the transformer substation A to the standby switch as a power supply line A, and defining a power supply line from the transformer substation B to the standby switch as a power supply line B; each 35kV transformer substation is provided with a spare power automatic switching device for controlling an interconnection switch and a spare switch; a master control device is arranged in the transformer substation A or the transformer substation B, and the spare automatic switching devices are in signal connection with the master control device through optical fibers; a spare power automatic switching control system is formed by the master control device, each spare power automatic switching device and the optical fiber;

step (3) each spare power automatic switching device monitors the voltage and current conditions of the corresponding 35kV transformer substation in real time, can control the working states of interconnection switches or standby switches on two sides of the corresponding 35kV transformer substation, and sends signals to a main control device in real time;

step (4), when the master control device receives a voltage loss signal of the 35kV transformer substation transmitted by the spare power automatic switching device, judging that a fault occurs; when only receiving a voltage loss signal of a 35kV transformer substation, the controller transmits a control signal to a standby automatic device of the 35kV transformer substation, trips off an interconnection switch on one side of the 35kV transformer substation close to the 220kV transformer, and transmits the trip signal back to the master controller; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be switched on to complete the standby automatic switching; when voltage loss signals of a plurality of 35kV transformer substations are received, turning to the step (5);

step (5), when receiving the voltage loss signals of a plurality of 35kV transformer substations, the master control device firstly judges whether the voltage loss signals are on a power supply line A or a power supply line B, if the voltage loss signals are on the same power supply line, a control signal is sent to a standby automatic device of the most upstream voltage loss 35kV transformer substation according to the current flow direction, a contact switch on one side, close to a 220kV transformer, of the voltage loss 35kV transformer substation is controlled by the standby automatic device to be tripped, and the tripping signal is transmitted back to the master control device; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be switched on to complete the standby automatic switching; if not, turning to the step (/ 6);

and (6) when the voltage loss signals of a plurality of 35kV transformer substations are received and are not in the same power supply line, the master control device does not send a self-switching signal to the spare self-switching device of any 35kV transformer substation and sends an alarm signal.

(III) advantageous effects

Compared with the prior art, the main control device and the spare automatic switching devices arranged in the 35kV transformer substation are arranged, the main control device and the spare automatic switching devices are connected through optical fiber signals, the running state of each spare automatic switching device can be controlled through the main control device, switching of the connection switch and the spare switch of the 35kV transformer substation is controlled, and switching in the switching-on and switching-off states is finally achieved when faults occur.

The invention provides a spare power automatic switching control system which is formed by a master control device and each spare power automatic switching device through optical fibers.

The spare power switching device completely collects signals of all the automatic switching devices through the master control device, carries out master control on all the spare power automatic switching devices, does not relate to other parameters such as protection fixed values and the like, and is simple in method.

Drawings

Fig. 1 is a schematic diagram of the present invention, and the number of 35kV substations in the diagram is only an exemplary number, and can be increased or decreased according to actual circumstances.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a spare power automatic switching method for a 35kV line includes the following steps:

step (1), constructing a double-end power supply grid system which comprises two 220kV substations and is defined as a substation A and a substation B; a 35kV transformer substation is connected between a 35kV outlet end on a low-voltage side of the transformer substation A and a 35kV outlet end on a low-voltage side of the transformer substation B through 35kV connecting lines, the 35kV connecting lines are positioned on the 35kV outlet side of the low-voltage side of the transformer substation A, the 35kV outlet side of the low-voltage side of the transformer substation B and two sides of each 35kV transformer substation are respectively provided with a connecting switch, one connecting switch is set as an open loop point and is defined as a standby switch;

defining a power supply line from the transformer substation A to the standby switch as a power supply line A, and defining a power supply line from the transformer substation B to the standby switch as a power supply line B; each 35kV transformer substation is provided with a spare power automatic switching device for controlling an interconnection switch and a spare switch; a master control device is arranged in the transformer substation A or the transformer substation B, and the spare automatic switching devices are in signal connection with the master control device through optical fibers; a spare power automatic switching control system is formed by the master control device, each spare power automatic switching device and the optical fiber;

step (3) each spare power automatic switching device monitors the voltage and current conditions of the corresponding 35kV transformer substation in real time, can control the working states of interconnection switches or standby switches on two sides of the corresponding 35kV transformer substation, and sends signals to a main control device in real time;

step (4), when the master control device receives a voltage loss signal of the 35kV transformer substation transmitted by the spare power automatic switching device, judging that a fault occurs; when only receiving a voltage loss signal of a 35kV transformer substation, the control device transmits a control signal to a standby automatic device of the 35kV transformer substation, and trips off an interconnection switch on one side of the 35kV transformer substation close to the 220kV transformer, and transmits the trip-off signal back to the main control device; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be closed to complete the standby automatic switching; when voltage loss signals of a plurality of 35kV transformer substations are received, turning to the step (5);

step (5) when voltage loss signals of a plurality of 35kV transformer substations are received, the master control device firstly judges whether the voltage loss signals are in a power supply line A or a power supply line B, if the voltage loss signals are in the same power supply line, a control signal is sent to a standby automatic device of the most upstream voltage loss 35kV transformer substation according to the current flow direction, a contact switch of the 35kV transformer substation close to one side of a 220kV transformer is tripped, and the tripped signal is transmitted back to the master control device; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be switched on to complete the standby automatic switching; if not, turning to the step (/ 6);

and (6) when the voltage loss signals of a plurality of 35kV transformer substations are received and are not in the same power supply line, the master control device does not send a self-switching signal to the spare self-switching device of any 35kV transformer substation and sends an alarm signal.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A spare power automatic switching method for a 35kV line is characterized by comprising the following steps: comprises the following steps:

step (1), constructing a double-end power supply grid system, wherein the grid system comprises two 220kV transformer substations and is defined as a transformer substation A and a transformer substation B; a 35kV transformer substation is connected between a 35kV outlet end on a low-voltage side of the transformer substation A and a 35kV outlet end on a low-voltage side of the transformer substation B through 35kV connecting lines, the 35kV connecting lines are positioned on the 35kV outlet side of the low-voltage side of the transformer substation A, the 35kV outlet side of the low-voltage side of the transformer substation B and two sides of each 35kV transformer substation are respectively provided with a connecting switch, one connecting switch is set as an open loop point and is defined as a standby switch;

defining a power supply line from the transformer substation A to the standby switch as a power supply line A, and defining a power supply line from the transformer substation B to the standby switch as a power supply line B; each 35kV transformer substation is provided with a spare power automatic switching device for controlling an interconnection switch and a spare switch; a master control device is arranged in the transformer substation A or the transformer substation B, and the spare automatic switching devices are in signal connection with the master control device through optical fibers; a spare power automatic switching control system is formed by the master control device, each spare power automatic switching device and the optical fiber;

step (3), each spare power automatic switching device monitors the voltage and current conditions of the corresponding 35kV transformer substation in real time, can control the working states of contact switches or standby switches on two sides of the corresponding 35kV transformer substation, and sends signals to a master control device in real time;

step (4), when the master control device receives a voltage loss signal of the 35kV transformer substation transmitted by the spare power automatic switching device, judging that a fault occurs; when only receiving a voltage loss signal of a 35kV transformer substation, the controller transmits a control signal to a standby automatic device of the 35kV transformer substation, trips off an interconnection switch on one side of the 35kV transformer substation close to the 220kV transformer, and transmits the trip signal back to the master controller; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be switched on to complete the standby automatic switching; when voltage loss signals of a plurality of 35kV transformer substations are received, turning to the step (5);

step (5), when receiving the voltage loss signals of a plurality of 35kV substations, the main control device firstly judges whether the voltage loss signals are in a power supply line A or a power supply line B, if the voltage loss signals are in the same power supply line, a control signal is sent to a standby automatic device of the most upstream voltage loss 35kV substation according to the current flow direction, a contact switch at one side, close to a 220kV transformer, of the voltage loss 35kV substation is controlled by the standby automatic device to be tripped, and the tripping signal is transmitted back to the main control device; after receiving the tripping signal, the main control device gives a control signal to the standby automatic device of the 35kV transformer where the standby switch is located, and the standby automatic device of the 35kV transformer where the standby switch is located controls the standby switch to be switched on to complete the standby automatic switching; if not, turning to the step (/ 6);

and (6) when the voltage loss signals of a plurality of 35kV transformer substations are received and are not in the same power supply line, the master control device does not send a self-switching signal to the spare self-switching device of any 35kV transformer substation and sends an alarm signal.

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