CN113541139A - Double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method - Google Patents
Double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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Abstract
The invention provides a double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method, and belongs to the technical field of transformer substations. When a bus is in voltage loss, the method determines the position of the voltage loss bus and a main supply switch thereof by collecting related electric quantity and switching quantity, and can switch on the corresponding backup power supply switch according to the input section switch backup power automatic switching or main transformer backup power automatic switching function after the main supply switch of the voltage loss bus is tripped, and further judge whether the backup power automatic switching is successful according to the accelerated switching condition after the fault and the bus voltage time. The method can realize the functions of the sectional spare power automatic switching and the main transformer spare power automatic switching in any operation mode in a single-bus two-section four-section bus ring connection mode of a double-branch incoming line and during the maintenance of any switch, improves the commissioning rate of the spare power automatic switching and the power supply reliability of a 10kV system, and ensures the reliable operation of a power grid.
Description
Technical Field
The invention belongs to the technical field of transformer substations, and particularly relates to a double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method.
Background
The automatic switching device of the standby power supply (called as a spare power automatic switching device for short) is key equipment for improving the power supply reliability of a power system, when a system bus working power supply loses voltage due to reasons, the spare power automatic switching device quickly cuts off the working power supply and switches the standby power supply, and the normal running voltage of the system bus is restored, so that the continuous power supply of a 10kV bus is guaranteed.
When the 10kV bus wiring adopts a wiring mode of 'a single bus two-section four-section bus ring shape with double branch incoming lines', the load of the bus can be better distributed, and the risk that a main transformer becomes overloaded when a large-capacity main transformer is used is reduced; meanwhile, the wiring mode is more favorable for switch maintenance, the load of a certain bus is more convenient to transfer due to the annular design of the double-main-transformer double-branch incoming line and the four-section bus, and therefore normal power supply of a 10kV load can be achieved when any main-transformer variable-down branch switch is maintained.
At present, a wiring mode of 'single-bus two-section four-section bus ring shape with double branch incoming lines' is adopted for a 10kV bus, corresponding spare power automatic switching is not available, and a spare power supply source cannot be timely switched in when a main power supply source fails, so that power failure and load loss cannot be reduced to the maximum extent.
Disclosure of Invention
In view of the above, the present invention aims to solve the problem that the existing backup power automatic switching device cannot adapt to a 10kV bus in a connection manner of "a single bus two-section four-section bus ring with a double branch incoming line", and cannot timely switch in a backup power supply when a main power supply fails, so that power failure and load loss cannot be reduced to the maximum extent.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the invention provides a double-branch incoming line single-bus two-section four-section bus ring spare power automatic switching method, which is suitable for a 10kV bus adopting a double-branch incoming line single-bus two-section four-section bus ring connection mode, and a connection structure of the 10kV bus specifically comprises:
the system comprises a first main transformer, a second main transformer, a first bus connected with the first main transformer through a second low-changing branch switch, a third bus connected with the first main transformer through the first low-changing branch switch, a second bus connected with the second main transformer through a third low-changing branch switch, and a fourth bus connected with the second main transformer through a fourth low-changing branch switch, wherein the first bus is connected with the second bus through a first section switch, and the third bus is connected with the fourth bus through a second section switch;
when the first section switch and/or the second section switch are/is in the separated position, the spare power automatic switching of the section switch in the separated position carries out spare power automatic switching charging according to the first spare power automatic switching charging condition;
when the first section switch and the second section switch are both closed, the main transformer spare power automatic switching carries out spare power automatic switching charging according to a second spare power automatic switching charging condition;
the spare power automatic switching method comprises the following steps:
determining the spare power automatic switching needed to be switched according to the switch position of the section switch;
collecting switching value and electric quantity in a wiring structure of a 10kV bus;
determining a voltage-loss bus and a main supply low-voltage switch of the voltage-loss bus according to the switching value and the electrical quantity;
tripping a main supply low-level switch of the voltage-loss bus, judging whether the main supply low-level switch of the voltage-loss bus is in a separated position, if not, discharging and returning the backup power automatic switch, and if so, switching on a corresponding switch according to the input backup power automatic switch;
and judging whether an acceleration switching condition after the fault is met, if so, returning the backup power automatic switching, otherwise, judging whether the duration time of any phase voltage of any section of bus is less than a preset time threshold value, if so, returning the backup power automatic switching, and if not, successfully acting the backup power automatic switching.
Further, the first backup power automatic switching charging condition specifically includes:
the total function hard pressing plate and the total function soft pressing plate are put into operation;
the voltage of the buses at the two ends of the sectionalized switch is greater than a fixed voltage value;
there is no external blocking signal.
Further, the second backup power automatic switching charging condition specifically includes:
the total function hard pressing plate and the total function soft pressing plate are put into operation;
the voltage of any section of bus is greater than a fixed value;
there is no external blocking signal.
Further, the switching value specifically includes:
the switch position of each low-going branch switch and the switch position of each section switch.
Further, the electrical quantity specifically includes:
each low-going branch switch corresponds to the voltage and current of the branch and the voltage and current of each segment bus.
Further, the method for determining the backup power automatic switching needed to be switched according to the switch position of the section switch specifically comprises the following steps:
when the first section switch or the second section switch is in the branch position, the section switch spare power automatic switching in the branch position is the spare power automatic switching needing to be switched in;
when the first section switch and the second section switch are both in the closed position, the main transformer spare power automatic switching is the spare power automatic switching needing to be switched.
Further, when the input backup power automatic switch is a section switch backup power automatic switch, the corresponding switch according to the input backup power automatic switch is specifically:
and preparing the sectional switch which is automatically switched on in the branch position according to the sectional switch in the branch position.
Further, when the input backup power automatic switching is main backup power automatic switching, the corresponding switch according to the input backup power automatic switching specifically comprises:
and switching to the low supply according to the main transformer spare self-switching spare supply.
Further, before switching on the corresponding switch according to the input spare power automatic switching, the method further comprises the following steps:
and judging whether the voltage-loss bus has a load unit, if so, cutting off the load unit and then switching on a corresponding switch according to the input spare power automatic switching, and if not, directly switching on the corresponding switch according to the input spare power automatic switching.
In a second aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the dual-branch incoming line single bus two-section four-segment bus ring spare power automatic switching method according to the first aspect.
In summary, the present invention provides a single-bus two-section four-segment bus ring backup power automatic switching method for a dual-branch incoming line, and a sectionalizer backup power automatic switching and a main transformer backup power automatic switching are configured for a "single-bus two-section four-segment bus ring connection manner for a dual-branch incoming line". When a bus is in voltage loss, the method determines the position of the voltage loss bus and a main supply switch thereof by collecting related electric quantity and switching quantity, and can switch on the corresponding switch according to the switched sectional switch backup power automatic switching or the main transformer backup power automatic switching after the main supply switch of the voltage loss bus is tripped, and further judge whether the backup power automatic switching is successful according to the accelerated switching condition after the fault and the bus voltage time. The method realizes the functions of the sectional spare power automatic switching and the main transformer spare power automatic switching in any operation mode in a single-bus two-section four-section bus ring connection mode of a double-branch incoming line and during the maintenance of any switch, improves the commissioning rate of the spare power automatic switching and the power supply reliability of a 10kV system, and ensures the reliable operation of a power grid. The method solves the problem that the conventional spare power automatic switching device cannot adapt to a 10kV bus adopting a connection mode of 'a single-bus two-section four-section bus ring shape with double branch incoming lines', cannot timely switch into a spare power supply when a main power supply fails, and cannot reduce power failure and load loss to the maximum extent.
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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a double branch incoming line single bus two-section four-section bus ring spare power automatic switching method according to an embodiment of the present invention;
fig. 2 is a schematic wiring diagram of a double-branch incoming line single-bus two-section four-section bus ring-shaped 10kV bus provided in the embodiment of the present invention;
fig. 3 is a flowchart of the operation of the sectionalizer backup power automatic switching device according to the embodiment of the present invention;
fig. 4 is an operation flow chart of the main backup power automatic switching device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below 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.
Referring to fig. 2, fig. 2 shows a connection method of a ring-shaped 10kV bus with a single bus, two sections and four sections of buses of a double branch incoming line, the connection method mainly comprises two main transformers, four low-changing double branch switches, two section switches and four sections of 10kV buses. The four-section 10kV bus comprises a first section of bus 1M, a second section of bus 2M, a third section of bus 3M and a fourth section of bus 4M, and the four sections of buses are connected into a ring structure. The four main-section dual-branch low-voltage switches include a #1 main-section low-voltage first branch switch 1DL, a #1 main-section low-voltage second branch switch 2DL, a #2 main-section low-voltage first branch switch 4DL, and a #2 main-section low-voltage second branch switch 5 DL. The two section switches include a first section switch 3DL and a second section switch 6 DL. The first section switch 3DL is connected with the first section bus 1M and the second section bus 2M, and the second section switch 6DL is connected with the third section bus 3M and the fourth section bus 4M.
The section switch spare power automatic switching and the main transformer spare power automatic switching of the method are charged according to different switch positions of the section switch, so that when a 10kV bus operation mode changes or a certain switch is overhauled, a spare power automatic switching function can be realized through the corresponding section switch spare power automatic switching or the main transformer spare power automatic switching, and the operation rate of the spare power automatic switching is improved. The specific situation of the backup power automatic switching charging is as follows:
when the first section switch 3DL and/or the second section switch 6DL are/is in the branch position, the section switch backup power automatic switch in the branch position carries out backup power automatic switch charging according to the first backup power automatic switch charging condition.
When the first section switch 3DL and the second section switch 6DL are both in the closed position, the main transformer backup power automatic switching carries out backup power automatic switching charging according to the second backup power automatic switching charging condition.
It should be noted that the first backup power automatic switching charging condition specifically includes:
the total function hard pressing plate input, the total function soft pressing plate input and the voltage of the bus at two ends of the sectionalized section switch are all larger than a fixed value; there is no external blocking signal.
Namely, the charging conditions of the first section switch 3DL backup power automatic switch are as follows: the total function hard pressing plate and the total function soft pressing plate are put into operation; the first section of bus 1M and the second section of bus 2M of the 10kV bus connection line have voltages and meet the condition that the voltages are greater than a constant value; a 10kV bus connection first section switch 3DL is in a position division; there is no external blocking signal.
The charging conditions of the second segment 6DL backup power automatic switching are as follows: the total function hard pressing plate and the total function soft pressing plate are put into operation; the third section of bus 3M and the fourth section of bus 4M of the 10kV bus connection line have voltages which are larger than a predetermined value; the 10kV bus connection second section switch 6DL is in a position division; there is no external blocking signal.
The second backup power automatic switching charging condition specifically comprises the following steps:
the total function hard pressing plate and the total function soft pressing plate are put into operation; the first section switch 3DL and the second section switch 4DL are both in the closed position in the 10kV bus connection mode; under the wiring mode, the three phases of the two sections of buses meet the voltage, and the voltage is greater than or equal to the voltage of the detection bus and has a fixed value; there is no external blocking signal. And when the conditions are met, the main transformer spare power automatic switching device is charged.
Referring to fig. 1, since the existing backup power automatic switching devices cannot achieve the functions of the sectionalized backup power automatic switching device and the main transformer backup power automatic switching device for the connection mode, the embodiment provides a ring-shaped backup power automatic switching method for a single bus two-sectioned four-sectioned bus of a dual branch incoming line, which is suitable for a 10kV bus adopting a ring-shaped connection mode for a single bus two-sectioned four-sectioned bus of a dual branch incoming line, and specifically includes the following steps:
s101: and determining the spare power automatic switching needed to be switched according to the switch position of the section switch.
It can be understood that when at least one section switch is in the open position, the section switch is in the spare power automatic switching device. And when the two section switches are both in the closed position, the main transformer spare power automatic switching is put into operation.
S102: and collecting the switching value and the electric quantity in the wiring structure of the 10kV bus.
The switching value specifically includes the switching position of each low-level branch switch and the switching position of each section switch. Namely: the switching positions of #1 main transformer low first branch switch 1DL and second branch switch 2DL, the switching positions of #2 main transformer low first branch switch 4DL and second branch switch 5DL, and the switching positions of 10kV bus bar first section switch 3DL and second section switch 6 DL.
The electrical quantities specifically include the voltage and current of the branch corresponding to each low-voltage branch switch and the voltage and current of each section of bus. Namely, the voltage and current of the #1 main transformer low first branch (the first branch and the second branch from left to right respectively), the voltage and current of the #1 main transformer low second branch, the voltage and current of the #2 main transformer low first branch, the voltage and current of the #2 main transformer low second branch, the voltage and current of the 10kV 1M bus, the voltage and current of the 10kV 2M bus, the voltage and current of the 10kV 3M bus and the voltage and current of the 10kV 4M bus.
S103: and determining the main supply low-level switch of the voltage-loss bus and the voltage-loss bus according to the switching value and the electrical value.
S104: and jumping the main supply low-level switch of the voltage-loss bus, judging whether the main supply low-level switch of the voltage-loss bus is in a branch position, if not, discharging and returning the backup power automatic switch, and if so, switching the corresponding switch according to the input backup power automatic switch.
In this case, if the section switch is in the standby power automatic switching mode, the section switch in the branch position is closed. If the main transformer is in the spare power automatic switching operation, a spare power supply low switch is needed.
S105: and judging whether an acceleration switching condition after the fault is met, if so, returning the backup power automatic switching, otherwise, judging whether the duration time of any phase voltage of any section of bus is less than a preset time threshold value, if so, returning the backup power automatic switching, and if not, successfully acting the backup power automatic switching.
It should be noted that, the 10kV busbar is not generally configured with busbar differential protection, and when a fault occurs, in order to avoid the expansion of the accident caused by the backup power supply switching at the fault point, the 10kV backup power supply switching needs to be equipped with a function of accelerating switching after the fault. If the condition of 1M voltage loss is assumed, if the following operation conditions of the post-fault accelerated switching function are met, the section switch or the standby low-voltage switch is cut off by sending a command, the standby automatic switching is judged to fail, and the device returns. If any phase of the 1M bus has a voltage reaching a preset time threshold (actually set to be 100 ms) and the post-fault acceleration condition is not met all the time, the spare power automatic switching action is judged to be successful. In the same way, the principle of the function of the accelerated switching after the fault is the same under the condition that other buses are in voltage loss.
And (3) operating conditions of the post-fault accelerated switching function: firstly, accelerating to switch function control words to be 1 after faults; any phase of the first interval of the main transformer which becomes low or any phase of the second interval which becomes low is connected with the current out-of-limit setting value of the accelerated switching; thirdly, any phase voltage of the bus is lower than a voltage fixed value, or the zero sequence voltage of the bus is greater than a zero sequence curing fixed value, or the negative sequence voltage of the bus is greater than a negative sequence curing fixed value
In addition, in order to ensure that the load carried by the backup power supply does not exceed the power supply capacity, a small power supply (i.e., a lower-level load unit of the voltage-loss bus) needs to be switched off in a connected mode, and then the section switch is switched on. The control system cuts off the load units (small power supplies) according to the priority, controls the section switch to be switched on and off after waiting for a certain time, and directly switches the section switch (or the standby low-voltage switch) without time delay if no small power supply can be switched off.
The section switch backup power automatic switching device and the main transformer backup power automatic switching device provided by the embodiment will be further described with reference to fig. 2-4.
The first section switch spare power automatic switching comprises the condition that a first section switch is in a separation position, a second section switch is in a closing position, a second section switch is in a separation position, a first section switch is in a closing position and two section switches are in separation positions.
1) The first section switch 3DL is in the open position, the second section switch 6DL is in the closed position
When the charging of the first subsection spare power automatic switching device is finished and the spare power automatic switching device collects that a 1M bus is not voltage, a 2M bus is voltage and a #1 main transformer becomes low and a second branch switch 2DL does not flow, the #1 main transformer becomes low and the second branch switch 2DL is switched off after starting time delay and setting time, and then the first subsection switch 3DL is switched on after switching-on time delay and setting time of the #1 main transformer becomes low and the second branch switch 2DL is switched off; when the charging of the first subsection spare power automatic switching device is finished and the spare power automatic switching device collects that a 2M bus is not voltage, a 1M bus is voltage and a #2 main transformer low-voltage switch 4DL is not current, the #2 main transformer low-voltage switch 4DL is tripped after the time of starting a delay set value, then the #2 main transformer low-voltage switch 4DL is judged to be in a tripping position, and the first subsection switch 3DL is switched after the section switch switching-on delay set value.
2) The second section switch is in the open position, the first section switch is in the closed position
When the second subsection spare power automatic switching charging is completed and the spare power automatic switching device collects that a 4M bus is not voltage, a 3M bus is voltage and a #2 main transformer low-voltage switch 5DL is not current, the #2 main transformer low-voltage switch 5DL is tripped after the time of starting a delay set value, then the #2 main transformer low-voltage switch 5DL is judged to be in a disconnection state, and the second subsection switch 6DL is switched after the section switch closing delay set value; when the second subsection spare power automatic switching charging is completed and the spare power automatic switching device collects that the 3M bus is not voltage, the 4M bus is voltage and the #1 main transformer low-voltage switch 1DL is not current, the #1 main transformer low-voltage switch 1DL is tripped after the starting delay time is set, then the #1 main transformer low-voltage switch 1DL is judged to be in the off position, and the second subsection switch 6DL is switched after the subsection switch switching-on delay time is set.
3) Two section switches are in the position
When the charging of the first subsection spare power automatic switching and the charging of the second subsection spare power automatic switching are completed and the spare power automatic switching device collects that a 1M bus is not voltage, a 3M bus is not voltage, and a #1 main transformer becomes a first branch switch 1DL and a #1 main transformer becomes a second branch switch 2DL are not current, the #1 main transformer becomes a first branch switch 1DL and the #1 main transformer becomes a second branch switch 2DL after starting time delay and value setting time, and when the two switches are judged to be in the separated position, the first subsection switch 3DL and the second subsection switch 6DL are closed after the section switch closing time delay and value setting; when the first subsection spare power automatic switching and the second subsection spare power automatic switching are charged and the spare power automatic switching device collects that a 2M bus is not voltage, a 4M bus is not voltage, a #2 main transformer becomes a first branch switch 4DL and a #2 main transformer becomes a second branch switch 5DL without current, the #2 main transformer becomes a first branch switch 4DL and the #2 main transformer becomes a second branch switch 5DL are switched off after starting time delay and value time, and when the two switches are judged to be in the off-position, the first subsection switch 3DL and the second subsection switch 6DL are switched on after the subsection switch switching time delay and value.
When the main transformer is in automatic backup power switching, the two section switches are both in the closed position. The running state of the main transformer low-level switch comprises that switches 1DL and 2DL are both in on-position, switches 4DL and 5DL are both in off-position, switches 4DL and 5DL are both in on-position, switches 1DL and 2DL are both in off-position, only one of switch 1DL and switch 5DL is in off-position, and only one of switch 4DL and switch 2DL is in off-position.
1) The switches 1DL and 2DL are both in on-position, and the switches 4DL and 5DL are both in off-position
When the condition that the switches 1DL and 2DL have no current and all buses have no voltage is collected, the switches 1DL and 2DL are tripped after the time of starting the delay fixed value, and when the two switches are judged to be in the off position, the switches 4DL and 5DL are switched after the main transformer switch is switched on for the delay fixed value.
2) The switches 4DL and 5DL are both in the on position, and the switches 1DL and 2DL are both in the off position
When the condition that the switches 4DL and 5DL are zero current and all buses are not pressurized is acquired, the switches 4DL and 5DL are tripped after the time of starting the delay fixed value, and when the two switches are judged to be in the off position, the switches 1DL and 2DL are switched after the main transformer switch is switched on for the delay fixed value.
3) Only one of the switch 1DL and the switch 5DL is in the position division
A #2 main transformer low-voltage switch 5DL is in an on position and a #1 main transformer low-voltage switch 1DL is in an off position, when the switch 5DL has no current and 3M and 4M buses have no voltage, the switch 5DL is tripped and the switch 5DL is judged to be in the off position after the time of starting the delay constant value, and the switch 1DL is switched after the time of switching on the main transformer switch and the delay constant value; and when the switch 1DL is in no-current state and the 3M and 4M buses are not in voltage state, the switch 1DL is tripped after the time of starting the delay constant value, the switch 1DL is judged to be in the off state, and the switch 5DL is switched after the time of switching on the main transformer switch.
4) Only one of switch 4DL and switch 2DL is in the divide position
A #2 main transformer low-voltage switch 4DL is in an on position and a #1 main transformer low-voltage switch 2DL is in an off position, when the switch 4DL has no current and buses of 1M and 2M have no voltage, the switch 4DL is tripped and the switch 4DL is judged to be in the off position after the time of starting the delay fixed value, and the switch 2DL is switched after the time of the main transformer switch on delay fixed value; and when the switch 2DL is not in current and the 1M and 2M buses are not in voltage, the switch 2DL is tripped after the time of starting the delay fixed value, the switch 2DL is judged to be in the off position, and the switch 4DL is switched after the time of switching on the main transformer switch.
In this embodiment, the discharge logic of each backup power automatic switch is that the backup power automatic switch discharges when any one of the following discharge conditions is satisfied:
1) the total function hard pressure plate and the total function soft pressure plate discharge immediately after exiting. 2) The spare power automatic switching switch is switched on and discharges after delaying for 10 s. 3) When the device is not started, the main supply low-level switch discharges immediately after the closed position is changed from 1 → 0 (or a hand jump signal 0 → 1), and manual reset is not needed. 4) When receiving the automatic action locking signal, the automatic action locking signal is immediately discharged and needs manual reset. 5) And (4) immediately discharging after receiving the external locking action signal 1, and automatically recharging and judging after the signal disappears. 6) And the buses at the two ends are subjected to PT three-phase disconnection and immediately discharged.
In this embodiment, the backup power automatic switching non-discharge logic is to perform non-discharge when any one of the following conditions is satisfied:
1) after the device is not started, the main supply low switch is not discharged from the position 1 → 0 (or the hand jump signal 0 → 1) after being closed. 2) Under the condition of small power supply support, when the bus voltage is suspended between a voltage fixed value and a non-voltage fixed value, the device should not be started, and the device needs to be ensured not to discharge all the time. And the backup power automatic switching action is carried out until the bus voltage is lower than the non-voltage fixed value. 3) There is only one bus PT single-phase or two-phase broken line, the device should not discharge. 4) Under the main transformer spare power automatic switching mode, PT three-phase disconnection occurs to any section of bus, and the device should not discharge.
The embodiment provides a double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method, and a sectional switch spare power automatic switching device and a main transformer spare power automatic switching device are configured for a wiring mode of 'single-bus two-section four-section bus ring-shaped' of a double-branch incoming line. When a bus is in voltage loss, the method determines the position of the voltage loss bus and a main supply switch thereof by collecting related electric quantity and switching quantity, and can switch on the corresponding switch according to the switched sectional switch backup power automatic switching or the main transformer backup power automatic switching after the main supply switch of the voltage loss bus is tripped, and further judge whether the backup power automatic switching is successful according to the accelerated switching condition after the fault and the bus voltage time. To "single female two sections four sections bus ring shape of two branch inlet wires" wiring mode, for the open loop operation in normal operating, there are 8 kinds of open loop operation modes, and the combination of corresponding open loop point includes: 1DL and 2DL, 2DL and 6DL, 3DL and 1DL, 3DL and 6DL, 3DL and 5DL, 4DL and 1DL, 4DL and 6DL, and 4DL and 5DL, 6 kinds of main automatic backup automatic switching can be realized, and 6 kinds of sectional automatic backup automatic switching and 6 kinds of main automatic backup automatic switching can be realized.
The method realizes the functions of the sectional spare power automatic switching and the main transformer spare power automatic switching in any operation mode in a single-bus two-section four-section bus ring connection mode of a double-branch incoming line and during the maintenance of any switch, improves the commissioning rate of the spare power automatic switching and the power supply reliability of a 10kV system, and ensures the reliable operation of a power grid.
The above is a detailed description of an embodiment of a method for a spare power automatic switching device in a ring shape with a double branch incoming line, a single busbar, a two-section four-section busbar, and the following is a detailed description of an embodiment of a computer readable storage medium provided by the present invention.
A computer readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for standby power automatic switching of a dual branch incoming line single busbar two-section four-section busbar ring according to the foregoing embodiments is implemented.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method is characterized in that the spare power automatic switching method is suitable for a 10kV bus adopting a double-branch incoming line single-bus two-section four-section bus ring-shaped wiring mode, and a wiring structure of the 10kV bus specifically comprises the following steps:
the main control system comprises a first main transformer, a second main transformer, a first bus connected with the first main transformer through a second low-level branch switch, a third bus connected with the first main transformer through the first low-level branch switch, a second bus connected with the second main transformer through a third low-level branch switch, and a fourth bus connected with the second main transformer through a fourth low-level branch switch, wherein the first bus is connected with the second bus through a first section switch, and the third bus is connected with the fourth bus through a second section switch;
when the first section switch and/or the second section switch are/is in a separated position, the spare power automatic switching of the separated section switch carries out spare power automatic switching charging according to a first spare power automatic switching charging condition;
when the first section switch and the second section switch are both in the closed position, the main transformer spare power automatic switching carries out spare power automatic switching charging according to a second spare power automatic switching charging condition;
the spare power automatic switching method comprises the following steps:
determining the spare power automatic switching needed to be switched according to the switch position of the section switch;
collecting switching value and electric quantity in a wiring structure of the 10kV bus;
determining a voltage-loss bus and a main supply low-voltage switch of the voltage-loss bus according to the switching value and the electrical quantity;
jumping a main supply low-voltage switch of the voltage-loss bus, judging whether the main supply low-voltage switch of the voltage-loss bus is in a separated position, if not, discharging and returning the backup power automatic switch, and if so, switching a corresponding switch according to the input backup power automatic switch;
and judging whether an acceleration switching condition after the fault is met, if so, returning the backup power automatic switching, otherwise, judging whether the duration time of any phase voltage of any section of bus is less than a preset time threshold, if so, returning the backup power automatic switching, and if not, successfully acting the backup power automatic switching.
2. The double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method according to claim 1, wherein the first spare power automatic switching charging condition specifically comprises:
the total function hard pressing plate and the total function soft pressing plate are put into operation;
the voltage of the buses at the two ends of the sectionalizing switch is greater than a fixed voltage value;
there is no external blocking signal.
3. The double-branch incoming line single-bus two-section four-section bus ring-shaped spare power automatic switching method according to claim 1, wherein the second spare power automatic switching charging condition specifically comprises:
the total function hard pressing plate and the total function soft pressing plate are put into operation;
the voltage of any section of bus is greater than a fixed value;
there is no external blocking signal.
4. The method of claim 1, wherein the switching value specifically comprises:
the switch position of each low-going branch switch and the switch position of each section switch.
5. The method for standby power automatic switching of the double-branch incoming line single-bus two-section four-section bus ring according to claim 1, wherein the electrical quantity specifically comprises:
each low-going branch switch corresponds to the voltage and current of the branch and the voltage and current of each segment bus.
6. The method for double-branch incoming line single-busbar two-section four-section busbar annular spare power automatic switching according to claim 1, wherein the method for determining the spare power automatic switching required to be switched according to the switch position of the section switch specifically comprises the following steps:
when the first section switch or the second section switch is in a separated position, the section switch spare power automatic switching in the separated position is the spare power automatic switching needing to be switched;
when the first section switch and the second section switch are both in the closed position, the main transformer backup power automatic switching is the backup power automatic switching needing to be switched.
7. The method for double-branch incoming line single-busbar two-section four-section busbar annular spare power automatic switching according to claim 6, wherein when the input spare power automatic switching is a section switch spare power automatic switching, the corresponding switch according to the input spare power automatic switching specifically comprises:
and switching the sectionalized section switch according to the sectionalized section switch.
8. The method for double-branch incoming line single-busbar two-section four-section busbar annular spare power automatic switching according to claim 6, wherein when the input spare power automatic switching is main spare power automatic switching, the corresponding switch according to the input spare power automatic switching specifically comprises:
and switching to the low supply according to the main transformer spare self-switching spare supply.
9. The method for double-branch incoming line single-busbar two-section four-section busbar annular spare power automatic switching according to claim 1, wherein before switching on a corresponding switch according to the switched spare power automatic switching, the method further comprises the following steps:
and judging whether the voltage-loss bus has a load unit, if so, cutting off the load unit and then switching on a corresponding switch according to the input spare power automatic switching, and if not, directly switching on the corresponding switch according to the input spare power automatic switching.
10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the dual-branch incoming line single-busbar two-section four-segment busbar ring spare power automatic switching method according to any one of claims 1 to 9.
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