CN111668922B

CN111668922B - 10kV spare power automatic switching action method for transformer substation

Info

Publication number: CN111668922B
Application number: CN202010594900.9A
Authority: CN
Inventors: 樊新启; 吴海涛; 王世祥; 谷斌; 梁嘉俊
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2022-07-26
Anticipated expiration: 2040-06-28
Also published as: CN111668922A

Abstract

The invention relates to a 10kV spare power automatic switching action method for a transformer substation, which is realized based on the following wiring structure: the transformer comprises a first main transformer, a first bus connected with the first main transformer through a first low-changing switch, a second main transformer, a second bus connected with the second main transformer through a second low-changing switch, a third bus connected with the second main transformer through a third low-changing switch, a third main transformer, a fourth bus connected with the third main transformer through a fourth low-changing switch, a first grounding transformer connected with the first bus, a second grounding transformer connected with the second bus, a third grounding transformer connected with the fourth bus, a first section switch connecting the first bus with the second bus, and a second section switch connecting the fourth bus with the third bus; the method comprises the steps that when any bus is detected to be in voltage loss, the low-voltage switch of the bus has no current, the position of the low-voltage switch after being switched on is 1, and other normal buses have voltages, the low-voltage switch and a grounding transformer on the voltage-loss bus are switched off again in a delayed mode. The invention can realize automatic cutting off of the grounding transformer after 10kV spare power automatic switching.

Description

10kV spare power automatic switching action method for transformer substation

Technical Field

The invention relates to the technical field of substation spare power automatic switching, in particular to a 10kV spare power automatic switching action method for a substation.

Background

The power consumption has the symbolic effect of an economic barometer, and the electric energy as a high-quality energy plays an indispensable role in the rapid development of economy in various regions, so that the safety and reliability of a power supply system of a transformer substation become the focus of attention. In order to ensure the operation stability of a power grid and reduce short-circuit current when a fault occurs, a 10kV low-voltage side of a main transformer in a 220kV or 110kV transformer substation is generally in split operation, a line or equipment is in fault in a split operation mode, so that the voltage of a 10kV low-voltage side bus of the transformer substation is easily lost, and after a working power supply of normal operation of the equipment is cut off, an automatic standby power supply switching device can automatically and rapidly switch on a standby power supply to ensure the continuous operation of electric equipment. The spare power automatic switching device is mainly applied to a medium-low voltage distribution system below 110kV and is an important means for quickly recovering bus voltage and improving the requirement on power supply reliability. In recent years, the design and application of the backup power automatic switching device are developed and strengthened, and a plurality of relay protection equipment manufacturers in China also develop respective backup power automatic switching devices. The requirement on the spare power automatic switching is higher and higher, and if the voltage loss caused by faults can be correctly identified, the spare power supply is switched on, the spare power supply is suitable for main wiring modes of different transformer substations, and the structure is simple. At present, most of the design schemes for 110kV transformer substations are that a 110kV line supplies power to a 110kV transformer through a 110kV bus, and the transformer converts 110kV voltage into 10kV and then supplies power to a 10kV bus. When the 110kV main transformer breaks down and the fault equipment is removed, the 10kV bus which is supplied with power by the fault main transformer loses the power supply, so that a user on the 10kV feeder line cannot normally use the power, and the normal power supply of the voltage-losing bus is recovered by the spare power automatic switching action. The 10kV spare power automatic switching function is that when the main power supply disappears, the bus tie switch is automatically switched on, and the other normally running main power supply changes to the power supply of the voltage-loss bus.

Three transformers are commonly adopted in a 110kV transformer substation, a single-bus four-section wiring mode on a 10kV side is adopted, a second main transformer becomes in split operation, only one grounding transformer is provided for the 10kV bus carried by each main transformer, and a main wiring diagram is shown in figure 1. When a first main transformer fails to cause 10kV 1M voltage loss, a segmented 521 circuit breaker is converged according to the action logic of the conventional spare power automatic switching protection device, and at the moment, a first grounding transformer operating on 10kV 1M and a second grounding transformer operating on 10kV 2AM run in parallel, so that zero sequence current passing through the grounding transformers is reduced, the sensitivity is reduced, and the influence on quick grounding short circuit fault of a cut feeder is large.

Disclosure of Invention

The invention aims to provide a method for operating a 10kV spare power automatic switching device of a transformer substation, and aims to solve the technical problem that a dispatcher needs to remotely and manually cut off a grounding transformer or inform an operator to cut off the grounding transformer on the transformer substation site after the current 10kV spare power automatic switching device of the transformer substation operates, and manpower is consumed.

In order to achieve the above object, an embodiment of the present invention provides a method for operating a 10kV backup power automatic switching device of a substation, which is implemented based on a wiring structure, where the wiring structure includes: the transformer comprises a 110kV first main transformer, a 10kV first bus connected with the 110kV first main transformer through a first low-changing switch, a 110kV second main transformer, a 10kV second bus connected with the 110kV second main transformer through a second low-changing switch, a 10kV third bus connected with the 110kV second main transformer through a third low-changing switch, a 110kV third main transformer, a 10kV fourth bus connected with the 110kV third main transformer through a fourth low-changing switch, a first grounding transformer connected with the 10kV first bus, a second grounding transformer connected with the 10kV second bus, a third grounding transformer connected with the 10kV fourth bus, a first section switch connecting the 10kV first bus with the 10kV second bus, and a second section switch connecting the 10kV fourth bus with the 10kV third bus;

the spare power automatic switching method comprises the following steps:

and when the voltage of any section of bus is detected to be lost, the low-voltage switch of the section of bus has no current, the position of the low-voltage switch after being switched on is switched on, and other normal buses have voltages, the low-voltage switch and the grounding transformer on the voltage-lost bus are switched off again according to the set time delay of the backup power automatic switching device.

The spare power automatic switching method specifically comprises the following steps: when the spare power automatic switching average voltage division plate is in an input state, carrying out spare power automatic switching in a first mode according to the following first charging condition, first discharging condition and first action logic;

the first charging condition includes: all buses are three-phase and have pressure; all the low-change switches are in closed positions; the first section switch and the second section switch are in a position division state; the load sharing pressure plate corresponding to the second section switch is in an input state; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 1 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the first discharge condition includes: the voltage of more than two sections of buses disappears simultaneously; the spare power automatic switching device collects the trip-in of a first low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the first low-voltage switch is abnormal; the first low-changing switch can not be switched off; the spare power automatic switching quits operation; the first section switch is in an on position;

the first action logic comprises: the spare power automatic switching charging is normal, when the voltage of the first bus is detected to be out of voltage and the first low-voltage switch has no current, and the voltages of the second bus, the third bus and the fourth bus are normal, the first low-voltage switch and the first grounding variable switch are switched off in a delayed mode, after the first low-voltage switch is confirmed to be switched off, the second section switch is switched on in a delayed mode, the third low-voltage switch is switched off, and after the second section switch is confirmed to be switched on, the first section switch is switched on in a delayed mode.

The spare power automatic switching method further comprises the following steps: when the spare power automatic switching average voltage division plate is in the switching state, carrying out spare power automatic switching in a second mode according to the following second charging condition, second discharging condition and second action logic;

the second charging condition includes: all buses are three-phase and have pressure; all the low-change switches are in closed positions; the first section switch and the second section switch are in a position division; the load sharing pressure plate corresponding to the first section switch is in a switching state; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 2 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the second discharge condition includes: the voltages of more than two sections of buses disappear simultaneously; the spare power automatic switching device acquires the tripping-in of a fourth low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the fourth low-voltage switch is abnormal; the fourth low-change switch can not be switched off; the spare power automatic switching quits the operation; the second section switch is in the on position;

the second action logic comprises: the spare power automatic switching charging is normal, when the voltage of the fourth bus is detected to be out of voltage and the fourth low-voltage switch has no current, and the voltages of the second bus, the third bus and the first bus are normal, the fourth low-voltage switch and the third grounding transformer are switched off in a delayed mode, after the fourth low-voltage switch is confirmed to be switched off, the first section switch is switched on in a delayed mode, the second low-voltage switch is switched off in a delayed mode, and after the first section switch is confirmed to be switched on, the second section switch is switched on in a delayed mode.

The spare power automatic switching method further comprises the following steps: when the spare power automatic switching sharing pressure plate is in an exiting state, carrying out spare power automatic switching in a third mode according to the following third charging condition, third discharging condition and third action logic;

the third charging condition includes: the first bus and the second bus are both provided with three-phase voltage; the first low-changing switch and the second low-changing switch are both in on-position; the first section switch is in a section position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 3 control word switching; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the third discharge condition includes: the first bus and the second bus are both three-phase and pressureless; the spare power automatic switching device collects the trip-in of a first low-change switch; opening a spare power automatic switching locking total signal; the first low-changing switch TWJ is abnormal; the first low-changing switch can not be switched off; the spare power automatic switching quits the operation; the first section switch is in an on position;

the third action logic comprises: the backup power automatic switching charging is normal, when the first bus voltage loss and the first low-changing switch have no current are detected, and the second bus voltage is normal, the first low-changing switch and the first grounding transformer are switched off in a delayed mode, and after the first low-changing switch is confirmed to be switched off, the first section switch is switched on in a delayed mode.

The spare power automatic switching method further comprises the following steps: when the spare power automatic switching sharing pressure plate is in a quit state, carrying out spare power automatic switching in a fourth mode according to the following fourth charging condition, fourth discharging condition and fourth action logic;

the fourth charging condition includes: the first bus and the second bus are both provided with three-phase voltage; the first low-changing switch and the second low-changing switch are both in on-position; the first section switch is in a section position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 4 control words switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the fourth discharge condition includes: the first bus and the second bus are both three-phase and pressureless; the spare power automatic switching device acquires the second low-voltage switch which is switched on by hand; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the second low-voltage switch is abnormal; the second low-change switch can not be switched off; the spare power automatic switching quits the operation; the first section switch is in an on position;

the fourth action logic comprises: the backup power automatic switching charging is normal, when the second bus voltage loss is detected, the second low-voltage switch has no current, and the first bus voltage is normal, the second low-voltage switch and the second grounding transformer are switched off in a delayed mode, and after the second low-voltage switch is confirmed to be switched off, the first section switch is switched on in a delayed mode.

The spare power automatic switching method further comprises the following steps: when the spare power automatic switching sharing pressure plate is in a quitting state, carrying out spare power automatic switching in a fifth mode according to the following fifth charging condition, fifth discharging condition and fifth action logic;

the fifth charging condition includes: the fourth bus and the third bus have three-phase voltage; the fourth low-changing switch and the third low-changing switch are both in on-position; the second section switch is in a branching position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 5 control words switching; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the fifth discharge condition includes: the fourth bus and the third bus are both three-phase and pressureless; the spare power automatic switching device acquires the tripping-in of a third low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the third low-voltage switch is abnormal; the third low-changing switch can not be switched off; the spare power automatic switching quits operation; the second section switch is in the closed position;

the fifth action logic comprises: when the voltage of the fourth bus is normal, the third low-voltage switch is tripped out in a delayed mode, and the second section switch is switched on in a delayed mode after the third low-voltage switch is confirmed to be switched off.

The spare power automatic switching method further comprises the following steps: when the spare power automatic switching uniform pressure plate is in the withdrawing state, carrying out spare power automatic switching according to the following sixth charging condition, sixth discharging condition and sixth action logic in a sixth mode;

the sixth charging condition includes: the fourth bus and the third bus have three-phase voltage; the fourth low-changing switch and the third low-changing switch are in closed positions; the second section switch is in a sub position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 6 control words switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the sixth discharge condition includes: the fourth bus and the third bus are both three-phase and pressureless; the spare power automatic switching device acquires the tripping-in of a fourth low-change switch; opening a spare power automatic switching locking total signal; the adjustment position relay TWJ corresponding to the fourth low-voltage switch is abnormal; the fourth low-change switch can not be switched off; the spare power automatic switching quits the operation; the second section switch is in the closed position;

the sixth action logic comprises: when the voltage of the third bus is normal, the fourth low-voltage switch and the third grounding switch are delayed to be opened, and the second section switch is delayed to be closed after the fourth low-voltage switch is confirmed to be opened.

The embodiment of the invention provides a 10kV spare power automatic switching action method for a transformer substation, which can automatically cut off a grounding transformer without a dispatcher who manually cuts off the grounding transformer remotely or informs an operator to cut off the grounding transformer on the transformer substation site, can avoid manual operation, reduce the manual workload, avoid the parallel operation of the grounding transformers, avoid the reduction of the sensitivity of the grounding transformer, improve the safety and stability of a power grid, and automatically judge the grounding transformer needing to be cut off according to the adjustment of an operation mode.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of a 110kV line protection wiring structure according to an embodiment of the present invention.

Detailed Description

Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means within the skill of those in the art have not been described in detail so as not to obscure the invention.

The embodiment of the invention provides a 10kV spare power automatic switching action method for a transformer substation, which is realized based on a wiring structure, and as shown in figure 1, the wiring structure comprises: 110kV #1 main transformer (first main transformer), 10kV bus 1M (first bus) connected with 110kV #1 main transformer through a step-down switch 501 (first step-down switch), 110kV #2 main transformer (second main transformer), 10kV bus 2AM (second bus) connected with 110kV #2 main transformer through a step-down switch 502A (second step-down switch), 10kV bus 2BM (third bus) connected with 110kV #2 main transformer through a step-down switch 502B (third step-down switch), 110kV #3 main transformer (third main transformer), 10kV bus 3M (fourth bus) connected with 110kV #3 main transformer through a step-down switch 503 (fourth step-down switch), grounding transformer D01 (first grounding transformer) connected with 10kV bus 1M, grounding transformer D02 (second grounding transformer) connected with 10kV bus 2AM, grounding transformer D03 (third grounding transformer) connected with 10kV # 3M, section switch 521 (first section switch) connected with 10kV bus 1M and 10kV # 2AM, and a section switch 532 (second section switch) connecting the 10kV bus 3M and the 10kV bus 2 BM;

the spare power automatic switching method comprises the following steps: and when detecting that any section of bus is in voltage loss, the low-level switch of the section of bus has no current, the position of the low-level switch is 1 (namely the closing position) after the low-level switch is closed and other normal buses have voltage, tripping the low-level switch and the grounding transformer on the voltage-loss bus again according to the set time delay of the backup power automatic switch.

It can be understood that, due to the addition of the circuit of the trip grounding transformer, on the one hand, a trip outlet pressing plate of the trip grounding transformer needs to be added on the backup power automatic switching protection device, and on the other hand, an open terminal of the trip grounding transformer needs to be added on an open plate of the backup power automatic switching protection device.

Specifically, for the operation mode of fig. 1, the 10kV backup power automatic switching has an operation mode of 6, that is: 1M voltage loss action of the 10kV bus (equal division of the pressing plate for putting in and the equal division of the pressing plate for withdrawing); 2AM voltage loss action of the 10kV bus; 2BM voltage loss action of the 10kV bus; the 3M voltage loss action (equal division of the pressing plate for putting in, and equal division of the pressing plate for withdrawing) of the 10kV bus is sequentially defined as spare power automatic switching modes 1-6 in the embodiment.

As in the wiring structure of fig. 1, the current operation logic of the backup power automatic switching device is as follows: when the voltage of the 10kV bus is detected to be lost, the low-voltage switch of the section of bus has no current, the low-voltage switch is switched to be 1 and the normal bus has voltage, the low-voltage switch is switched off again according to the time delay set by the spare power automatic switching device, the section switch is switched on in a time delay manner after the low-voltage switch is confirmed to be switched off by the device, so that the normal voltage bus and the voltage-lost bus run in parallel, and at the moment, the grounding transformer running on the voltage-lost bus and the grounding transformer running on the voltage-lost bus run in parallel.

In the method of this embodiment, consideration of the operating state of the ground fault is added to the operation logic of the current backup power automatic switching device, and the backup power automatic switching method of this embodiment specifically includes the following backup power automatic switching methods (1) to (6) corresponding to the backup power automatic switching methods 1 to 6:

(1) when the spare power automatic switching average voltage division plate is in an input state, carrying out spare power automatic switching in a first mode according to the following first charging condition, first discharging condition and first action logic;

the first charging condition includes: 1. all buses are three-phase and have pressure; 2. all the low-change switches are in closed positions; 3. the section switches 521 and 532 are in the branch position; 4. the load sharing pressure plate corresponding to the section switch 532 is in the input state; 5. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 1 control word switching; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the first discharge condition includes: 1. the voltages of more than two sections of buses disappear simultaneously; 2. the spare power automatic switching device collects the low-change switch 501 and then switches on; 3. opening a spare power automatic switching locking total signal; 4. the trip position relay TWJ corresponding to the low-level switch 501 is abnormal; 5. the low-level switch 501 cannot be opened; 6. the spare power automatic switching quits the operation; 7. switch 521 is in the on position;

the first action logic comprises: when the bus 1M is detected to be out of voltage and the low-voltage switch 501 has no current, and the bus 2AM, the bus 2BM and the bus 3M are all normal in voltage, the low-voltage switch 501 and the grounding transformer D01 are switched off in a delayed mode, after the low-voltage switch 501 is confirmed to be switched off, the section switch 532 is switched on in a delayed mode, the low-voltage switch 502B is switched off, and after the section switch 532 is confirmed to be switched on, the section switch 521 is switched on in a delayed mode.

(2) When the spare power automatic switching equalizing pressure plate is in the switching state, carrying out spare power automatic switching in a second mode according to the following second charging condition, second discharging condition and second action logic;

the second charging condition includes: 1. all buses are three-phase and have pressure; 2. all the low-change switches are in closed positions; 3.

segments

521 and 532 are in quantiles; 4. the load sharing pressure plate corresponding to the section switch 521 is in a switching state; 5. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 2 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the second discharge condition includes: 1. the voltage of more than two sections of buses disappears simultaneously; 2. the spare power automatic switching device collects the low-level switch 503 and then opens the switch; 3. opening a spare power automatic switching locking total signal; 4. the trip position relay TWJ corresponding to the low-level switch 503 is abnormal; 5. the low-level switch 503 cannot be opened; 6. the spare power automatic switching quits the operation; 7. segmented switch 532 is on;

the second action logic comprises: when the backup power automatic switching charging is normal, when detecting that the bus 3M is out of voltage and the low-voltage switch 503 has no current, and the bus 2AM, 2BM and 1M are all normal in voltage, the low-voltage switch 503 and the grounding transformer D03 are switched off in a delayed mode, after confirming that the low-voltage switch 503 is switched off, the switch 521 is switched on and the switch 502A is switched off in a delayed mode, and after confirming that the switch 521 is switched on, the switch 532 is switched on in a delayed mode.

(3) When the spare power automatic switching sharing pressure plate is in the exit state, carrying out spare power automatic switching in a third mode according to the following third charging condition, third discharging condition and third action logic;

the third charging condition includes: 1. the bus 1M and the bus 2AM are both provided with three-phase pressure; 2. low going

switches

501 and 502A are both on; 3. the section switch 521 is in a sub-position; 4. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 3 control word switching; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the third discharge condition includes: 1. the bus 1M and the bus 2AM are both three-phase and pressureless; 2. the spare power automatic switching device collects the low-change switch 501 and then switches on; 3. opening a spare power automatic switching locking total signal; 4. low-going switch 501TWJ is abnormal; 5. the low-level switch 501 cannot be opened; 6. the spare power automatic switching quits operation; 7. switch 521 is in the on position.

The third action logic comprises: when the backup power automatic switching charging is normal, when detecting that the bus 1M is out of voltage and the low-level switch 501 has no current and the bus 2AM is normal in voltage, the low-level switch 501 and the grounding transformer D01 are switched off in a delayed mode, and after confirming that the low-level switch 501 is switched off, the section switch 521 is switched on in a delayed mode.

(4) When the spare power automatic switching sharing pressure plate is in a quitting state, carrying out spare power automatic switching in a fourth mode according to the following fourth charging condition, fourth discharging condition and fourth action logic;

the fourth charging condition includes: 1. the buses 1M and 2AM are both provided with three-phase pressure; 2. low going

switches

501 and 502A are both on; 3. the section switch 521 is in a branching position; 4. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 4 control words switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the fourth discharge condition includes: 1. the buses 1M and 2AM are three-phase and have no voltage; 2. the spare power automatic switching device collects the low-level switch 502A and then the hand is tripped in; 3. opening a spare power automatic switching locking total signal; 4. trip position relay TWJ corresponding to low-change switch 502A is abnormal; 5. the low-going switch 502A cannot open; 6. the spare power automatic switching quits the operation; 7. segmented switch 521 is in the on position;

the fourth action logic comprises: when the backup power automatic switching charging is normal, when detecting that the bus 2AM is in voltage loss, the low-level switch 502A is not in current, and the bus 1M is in normal voltage, the low-level switch 502A and the grounding transformer D02 are switched off in a delayed mode, and after confirming that the low-level switch 502A is switched off, the section switch 521 is switched on in a delayed mode.

(5) When the spare power automatic switching sharing pressure plate is in a quitting state, carrying out spare power automatic switching in a fifth mode according to the following fifth charging condition, fifth discharging condition and fifth action logic;

the fifth charging condition includes: 1. the three phases of the buses 3M and 2BM have pressure; 2. low going

switches

503 and 502B are both on; 3. segmented switches 532 are in the divide position; 4. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 5 control words switching; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the fifth discharge condition includes: 1. the buses 3M and 2BM are both three-phase and have no voltage; 2. the spare power automatic switching device acquires that the hand of a low-voltage switch 502B is tripped in; 3. opening a spare power automatic switching locking total signal; 4. trip position relay TWJ corresponding to low-level switch 502B is abnormal; 5. low-going switch 502B cannot open; 6. the spare power automatic switching quits operation; 7. segmented switch 532 is on;

the fifth action logic comprises: when the backup power automatic switching charging is normal, when detecting that the bus 2BM is out of voltage and the low-voltage switch 502B has no current, and the bus 3M voltage is normal, the low-voltage switch 502B is switched off in a delayed mode, and the section switch 532 is switched on in a delayed mode after confirming that the low-voltage switch 502B is switched off.

(6) When the spare power automatic switching uniform pressure plate is in the withdrawing state, carrying out spare power automatic switching according to the following sixth charging condition, sixth discharging condition and sixth action logic in a sixth mode;

the sixth charging condition includes: 1. the three phases of the buses 3M and 2BM have pressure; 2.

low switches

503 and 502B are in the on position; 3. the section switch 532 is in the divide position; 4. the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 6 control words; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the sixth discharge condition includes: 1. the bus 3M and the bus 2BM are both three-phase and have no voltage; 2. the spare power automatic switching device collects the low-voltage switch 503 and then switches on; 3. opening a spare power automatic switching locking total signal; 4. the adjustment position relay TWJ corresponding to the low switch 503 is abnormal; 5. the low-going switch 503 cannot be opened; 6. the spare power automatic switching quits the operation; 7. section switch 532 is on;

the sixth action logic comprises: when the backup power automatic switching charging is normal, when detecting that the bus 3M is out of voltage and the low-level switch 503 has no current, and the bus 2BM voltage is normal, the low-level switch 503 and the grounding transformer D03 are switched off in a delayed mode, and after confirming that the low-level switch 503 is switched off, the section switch 532 is switched on in a delayed mode.

It can be understood that, due to the addition of the circuit of the jump grounding transformer, on the one hand, a trip outlet pressing plate of the jump grounding transformer needs to be added on the backup power automatic switching protection device, and on the other hand, an open terminal of the jump grounding transformer needs to be added on an open plate of the backup power automatic switching protection device, which is a design that is easy to be made based on the backup power automatic switching action of the method of the embodiment. Besides, such as the equalizing pressure plate, the functional pressure plate, and the like are conventional component elements of the backup power automatic switching device, and this embodiment aims to improve and adjust the action logic of the backup power automatic switching device, and therefore, detailed descriptions of the specific structure of the backup power automatic switching device are omitted.

As can be seen from the description of the above embodiment, the method for operating a 10kV backup power automatic switching device of a substation provided by the embodiment of the present invention has the following advantages:

(1) the grounding transformer can be automatically cut off, and a dispatcher does not need to remotely and manually cut off one grounding transformer or inform an operator to cut off one grounding transformer on the site of the transformer substation;

(2) manual operation can be avoided, and the manual workload is reduced;

(3) the grounding transformer can be prevented from operating in parallel, the sensitivity of the grounding transformer is prevented from being reduced, the safety and stability of a power grid are improved, and the grounding transformer which needs to be disconnected can be automatically judged according to the adjustment of the operation mode.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A10 kV spare power automatic switching action method of a transformer substation is realized based on a wiring structure, and is characterized in that the wiring structure comprises: the transformer comprises a 110kV first main transformer, a 10kV first bus connected with the 110kV first main transformer through a first low-changing switch, a 110kV second main transformer, a 10kV second bus connected with the 110kV second main transformer through a second low-changing switch, a 10kV third bus connected with the 110kV second main transformer through a third low-changing switch, a 110kV third main transformer, a 10kV fourth bus connected with the 110kV third main transformer through a fourth low-changing switch, a first grounding transformer connected with the 10kV first bus, a second grounding transformer connected with the 10kV second bus, a third grounding transformer connected with the 10kV fourth bus, a first section switch connecting the 10kV first bus with the 10kV second bus, and a second section switch connecting the 10kV fourth bus with the 10kV third bus;

the spare power automatic switching action method comprises the following steps:

detecting that any section of bus is in voltage loss, the low-change switch of any section of bus has no current, the position of the low-change switch after being switched on is switched on, and other normal buses have voltage, and then tripping the low-change switch and the grounding low-change switch on any section of bus again according to the set time delay of the backup power automatic switching;

when the spare power automatic switching average voltage division plate is in an input state, carrying out spare power automatic switching in a first mode according to the following first charging condition, first discharging condition and first action logic; the first charging condition includes: all buses have three-phase voltage; all the low-change switches are in the on position; the first section switch and the second section switch are in the position division; the load sharing pressure plate corresponding to the second section switch is in an input state; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 1 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions; the first discharge condition includes: the voltage of more than two sections of buses disappears simultaneously; the spare power automatic switching device collects the trip-in of a first low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the first low-changing switch is abnormal; the first low-change switch can not be switched off; the spare power automatic switching quits operation; the first section switch is in an on position; the first action logic comprises: when the voltage of the second bus, the third bus and the fourth bus is detected to be in a normal state, the first low-voltage switch and the first grounding variable switch are switched off in a delayed mode, after the first low-voltage switch is confirmed to be switched off, the second section switch is switched on in a delayed mode, the third low-voltage switch is switched off, and after the second section switch is confirmed to be switched on, the first section switch is switched on in a delayed mode;

when the spare power automatic switching equalizing pressure plate is in the switching state, carrying out spare power automatic switching in a second mode according to the following second charging condition, second discharging condition and second action logic; the second charging condition includes: all buses have three-phase voltage; all the low-change switches are in closed positions; the first section switch and the second section switch are in a position division; the load sharing pressure plate corresponding to the first section switch is in a switching state; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 2 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions; the second discharge condition includes: the voltage of more than two sections of buses disappears simultaneously; the spare power automatic switching device acquires the tripping-in of a fourth low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the fourth low-voltage switch is abnormal; the fourth low-change switch can not be switched off; the spare power automatic switching quits operation; the second section switch is in the closed position; the second action logic comprises: the spare power automatic switching charging is normal, when the voltage of the fourth bus is detected to be out of voltage and the fourth low-voltage switch has no current, and the voltages of the second bus, the third bus and the first bus are normal, the fourth low-voltage switch and the third grounding transformer are switched off in a delayed mode, after the fourth low-voltage switch is confirmed to be switched off, the first section switch is switched on in a delayed mode, the second low-voltage switch is switched off in a delayed mode, and after the first section switch is confirmed to be switched on, the second section switch is switched on in a delayed mode.

2. The substation 10kV spare power automatic switching action method according to claim 1, further comprising: when the spare power automatic switching sharing pressure plate is in an exiting state, carrying out spare power automatic switching in a third mode according to the following third charging condition, third discharging condition and third action logic;

the third charging condition includes: the first bus and the second bus are three-phase and have voltage; the first low-changing switch and the second low-changing switch are both in closed positions; the first section switch is in a sub position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 3 control word switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the third discharge condition includes: the first bus and the second bus are both three-phase and pressureless; the spare power automatic switching device collects the trip-in of a first low-change switch; opening a spare power automatic switching locking total signal; the first low change switch TWJ is abnormal; the first low-change switch can not be switched off; the spare power automatic switching quits the operation; the first section switch is in an on position;

3. The substation 10kV spare power automatic switching action method according to claim 2, characterized in that the spare power automatic switching action method further comprises: when the spare power automatic switching sharing pressure plate is in a quitting state, carrying out spare power automatic switching in a fourth mode according to the following fourth charging condition, fourth discharging condition and fourth action logic;

the fourth charging condition includes: the first bus and the second bus are three-phase and have voltage; the first low-changing switch and the second low-changing switch are both in closed positions; the first section switch is in a section position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 4 control words switching; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;

the fourth discharge condition includes: the first bus and the second bus are both three-phase and pressureless; the spare power automatic switching device acquires the second low-voltage switch which is switched on by hand; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the second low-voltage switch is abnormal; the second low-voltage switch cannot be switched off; the spare power automatic switching quits operation; the first section switch is in an on position;

4. The substation 10kV spare power automatic switching action method according to claim 3, further comprising: when the spare power automatic switching sharing pressure plate is in a quitting state, carrying out spare power automatic switching in a fifth mode according to the following fifth charging condition, fifth discharging condition and fifth action logic;

the fifth charging condition includes: the fourth bus and the third bus are both provided with three-phase voltage; the fourth low-changing switch and the third low-changing switch are both in closed positions; the second section switch is in a sub position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 5 control words; the backup automatic switching meeting the conditions is completed after the preset time is reached;

the fifth discharge condition includes: the fourth bus and the third bus are both three-phase and pressureless; the spare power automatic switching device acquires the tripping-in of a third low-change switch; opening a spare power automatic switching locking total signal; the trip position relay TWJ corresponding to the third low-voltage switch is abnormal; the third low-voltage switch cannot be switched off; the spare power automatic switching quits the operation; the second section switch is in the closed position;

5. The substation 10kV spare power automatic switching action method according to claim 4, characterized in that the spare power automatic switching action method further comprises: when the spare power automatic switching uniform pressure plate is in the withdrawing state, carrying out spare power automatic switching according to the following sixth charging condition, sixth discharging condition and sixth action logic in a sixth mode;

the sixth charging condition includes: the fourth bus and the third bus have three-phase voltage; the fourth low-changing switch and the third low-changing switch are in closed positions; the second section switch is in a branching position; the spare power automatic switching function pressing plate is in a switching state and the spare power automatic switching mode is 6 control words; the charging is completed after the preset time is reached after the backup automatic switching meeting the conditions;