CN112260235B - Control method and device for grounding mode of grounding transformer on bus - Google Patents
Control method and device for grounding mode of grounding transformer on bus Download PDFInfo
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- CN112260235B CN112260235B CN202011164384.2A CN202011164384A CN112260235B CN 112260235 B CN112260235 B CN 112260235B CN 202011164384 A CN202011164384 A CN 202011164384A CN 112260235 B CN112260235 B CN 112260235B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The invention discloses a control method and a device for a grounding mode of a grounding transformer on a bus, wherein the control method comprises the following steps: acquiring a switching state of a main transformer electrically connected with a bus, a switching state of a grounding transformer electrically connected with the bus and a state of a sectionalizing switch between the buses; determining whether the switch state of the main transformer and the switch state of the ground transformer meet the preset switch state conditions; in the power supply main transformer switching process of the bus, if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state conditions, the grounding mode of the grounding transformer is controlled according to the switching state of the main transformer, the switching state of the grounding transformer and the states of the sectional switches. The control method and the device for the grounding mode of the grounding change on the bus can improve the control reliability.
Description
Technical Field
The invention relates to a power grid control technology, in particular to a control method and a device for a grounding mode of a grounding transformer on a bus.
Background
In order to ensure that the grounding faults of the 10kV buses can be quickly isolated in a power grid, a grounding transformer is arranged on the 10kV buses of each transformer to provide a circuit for grounding current, the grounding transformer arranged on the 10kV buses is grounded through a small resistor or through an arc suppression coil, and a corresponding grounding mode is needed for grounding the buses under the condition of planned work power conversion or accident.
At present, when a bus fault needs to switch the grounding mode, the conventional control method of the grounding mode on the bus is generally operated and controlled by a dispatcher, so that the speed is low, the reliability is poor, if the grounding mode is not switched in time, the protection misoperation can be possibly caused, and in addition, the situation of switching errors can be possibly caused in the control process.
Disclosure of Invention
The invention provides a control method and a control device for a grounding mode of a grounding transformer on a bus, which are used for improving the reliability of control.
In a first aspect, the present invention provides a method for controlling a grounding mode of a grounding transformer on a bus, including:
acquiring a switching state of a main transformer electrically connected with a bus, a switching state of a grounding transformer electrically connected with the bus and a state of a sectionalizing switch between the buses;
determining whether the switch state of the main transformer and the switch state of the ground transformer meet the preset switch state conditions;
in the power supply main transformer switching process of the bus, if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state conditions, the grounding mode of the grounding transformer is controlled according to the switching state of the main transformer, the switching state of the grounding transformer and the states of the sectional switches.
Optionally, determining whether the switching state of the main transformer meets the preset switching state condition includes:
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is at the closing position, the disconnecting link at the two sides of the low-voltage side breaker is at the closing position, and the high-voltage side breaker of the main transformer is at the closing position, determining that the switching state of the main transformer meets a first preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is in the split position or the disconnecting link at the two sides of the low-voltage side breaker is in the split position or the high-voltage side breaker of the main transformer is in the split position, determining that the switching state of the main transformer meets the second preset switching state condition.
Optionally, controlling the grounding mode of the grounding transformer according to the switch state of the main transformer, the switch state of the grounding transformer and the states of the sectionalizing switches includes:
if the switch of the main transformer accords with the preset switch state conditions of the high-voltage side breaker, the low-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, and the two side disconnecting links of the low-voltage side breaker, the switch of the grounding transformer accords with the preset switch state conditions of the high-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, the sectionalizing switch is in a sectionalizing state, and the grounding transformer of each section of bus electrically connected is grounded through a small resistor, the sectionalizing switch is controlled to be closed, the switch of the main transformer is opened, and the high-voltage side breaker of the grounding transformer is opened.
Optionally, controlling the grounding mode of the grounding transformer according to the switch state of the main transformer, the switch state of the grounding transformer and the states of the sectionalizing switches includes:
if the switch of the main transformer accords with the preset switch state conditions of the high-voltage side breaker, the low-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, and the two side disconnecting links of the low-voltage side breaker, the switch of the grounding transformer accords with the preset switch state conditions of the high-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, the sectionalizing switch is in a sectionalizing position, and the grounding transformer of each section of bus electrically connected is grounded through an arc suppression coil, the sectionalizing switch is controlled to be closed, and the switch of the main transformer is opened.
Optionally, controlling the grounding mode of the grounding transformer according to the switch state of the main transformer, the switch state of the grounding transformer and the states of the sectionalizing switches includes:
if the switch of the main transformer accords with the preset switch state conditions of the high-voltage side breaker, the low-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, and the two side disconnecting links of the low-voltage side breaker, the switch of the grounding transformer accords with the preset switch state conditions of the high-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, the sectionalizing switch is in a separated position, and the grounding transformer of each section of bus electrically connected is provided with the grounding transformer grounded through the arc suppression coil and the grounding transformer grounded through the small resistor, and corresponding alarm signals are sent out.
Optionally, before controlling the grounding mode of the grounding transformer, the method includes:
and delaying for a preset time to control the grounding mode of the grounding transformer.
Alternatively, one end of the bus is electrically connected with the low-voltage side breaker and the sectionalizing switch of the main transformer, and the other end of the bus is electrically connected with the high-voltage side breaker of the ground transformer.
Optionally, the switch state of the main transformer includes the on-off state of the two side disconnecting link of the high-voltage side breaker of the main transformer, the on-off state of the two side disconnecting link of the low-voltage side breaker, and the on-off state of the high-voltage side breaker of the main transformer, and the switch state of the ground transformer includes the on-off state of the two side disconnecting link of the high-voltage side breaker of the ground transformer and the on-off state of the high-voltage side breaker of the ground transformer.
Alternatively, the voltage on the bus is 10kV.
In a second aspect, the present invention further provides a control device for a grounding mode of a grounding transformer on a bus, including:
the switch state acquisition module is used for acquiring the switch state of the main transformer electrically connected with the bus, the switch state of the grounding transformer electrically connected with the bus and the state of the sectionalizing switch between the buses;
the state condition determining module is used for determining whether the switch state of the main transformer and the switch state of the ground transformer accord with preset switch state conditions or not;
and the grounding mode control module is used for controlling the grounding mode of the grounding transformer according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectional switch if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state condition in the switching process of the power supply main transformer of the bus.
According to the control method and the device for the grounding mode of the grounding transformer on the bus, whether the switching state of the main transformer and the switching state of the grounding transformer accord with the preset switching state condition or not is determined by acquiring the switching state of the main transformer electrically connected with the bus, the switching state of the grounding transformer electrically connected with the bus and the state of the sectionalized switch between the buses, so that in the switching process of the power supply main transformer of the bus, if the switching state of the main transformer and the switching state of the grounding transformer accord with the preset switching state condition, the grounding mode of the grounding transformer is controlled according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectionalized switch. Compared with the existing control method of the grounding mode of the grounding change on the bus, the control method and the device of the grounding mode of the grounding change on the bus, provided by the embodiment of the invention, automatically switch the grounding mode of the grounding change on the bus according to the switch state of the main transformer, the switch state of the grounding change and the state of the sectionalizing switch without manual operation, thereby improving the control reliability.
Drawings
Fig. 1 is a flowchart of a control method for a grounding mode of a grounding transformer on a bus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bus bar wiring provided in accordance with a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a switch state logic according to a first embodiment of the present invention;
fig. 4 is a flowchart of a control method of a grounding mode of a grounding transformer on a bus according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of control logic of a grounding mode of a grounding transformer on a bus according to a second embodiment of the present invention;
fig. 6 is a block diagram of a control device for a grounding mode of a bus-bar grounding transformer according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a method for controlling a grounding mode of a bus with a grounding change, which is provided in an embodiment of the present invention, and the method may be implemented by a device for controlling a grounding mode of a bus with a grounding change, and the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device, such as a computer, having a function of controlling a grounding mode of a bus with a grounding change, and specifically includes the following steps:
step 110, acquiring a switching state of a main transformer electrically connected with the bus, a switching state of a ground transformer electrically connected with the bus and a state of a sectionalizing switch between the buses.
The bus is a 10kV bus, one end of the bus is electrically connected with the low-voltage side circuit breaker of the main transformer and the sectionalizing switch, and the other end of the bus is electrically connected with the high-voltage side circuit breaker of the grounding transformer. The switching state of the main transformer comprises the switching state of the disconnecting link at the two sides of the high-voltage side breaker of the main transformer, the switching state of the disconnecting link at the two sides of the low-voltage side breaker, the switching state of the high-voltage side breaker of the main transformer and the switching state of the low-voltage side breaker, and the switching state of the grounding transformer comprises the switching state of the disconnecting link at the two sides of the high-voltage side breaker of the grounding transformer and the switching state of the high-voltage side breaker of the grounding transformer. The control device of the grounding mode of the grounding transformer on the bus can acquire the switch state of the main transformer electrically connected with the bus, the switch state of the grounding transformer electrically connected with the bus and the state of the sectionalized switch between the buses through the input port arranged on the control device, so as to control the grounding mode of the grounding transformer on the bus.
Specifically, fig. 2 is a schematic diagram of a bus connection provided in the first embodiment of the present invention, referring to fig. 2, the section i bus is connected with a high-voltage side breaker BG1, a low-voltage side breaker BD1, a sectionalizing switch FD12 and a high-voltage side breaker JD1 of a ground transformer 1, the section ii bus is connected with a low-voltage side breaker BD2, a high-voltage side breaker JD2, a sectionalizing switch FD12 and an FD23 of a main transformer 2, the section iii bus is connected with a high-voltage side breaker BG3, a low-voltage side breaker BD3, a high-voltage side breaker JD3 and a sectionalizing switch FD23 of a main transformer 3, the grounding of the section i bus and the section iii bus is grounded through a small resistor, and the grounding of the section ii bus is grounded through a grounding arc suppression coil. Under normal conditions, the main transformer 1, the main transformer 2 and the main transformer 3 respectively supply power for the I section bus, the II section bus and the III section bus, and if the main transformer 1 fails or needs to be overhauled, the power supply main transformer of the I section bus needs to be transferred from the main transformer 1 to the main transformer 2, and the main transformer 2 is used for supplying power for the I section bus and the II section bus so as to ensure that the buses work normally.
Step 120, determining whether the switch state of the main transformer and the switch state of the ground transformer meet the preset switch state condition.
Specifically, fig. 3 is a schematic diagram of a switch state logic provided in the first embodiment of the present invention, referring to fig. 3, BDi represents a low-voltage side breaker of a main transformer i, BGi represents a high-voltage side breaker of the main transformer i, if the BDi switch is on and the two side switches of the BDi switch are on, the BGi switch is on and the two side switches of the BGi switch are on, ZBi may be defined as 1, i.e., the BDi switch is on and the two side switches of the BDi switch are on, the BGi switch is off and the two side switches of the BGi switch are on, and BDi and BGi conform to a preset switch state ZBi =1; if the BDi switch is split or the two side knife switches of the BDi switch are split, or the BGi switch is split or the two side knife switches of the BGi switch are split, ZBi is defined as 0.JDi it is indicated that the low-voltage side breaker with the grounding switch i is turned on, the JDi switch is turned on, and the two side switches of the JDi switch are turned on, so JDi meets the preset switch state JDi =1, and the grounding mode of the grounding switch is controlled according to the switch state of the main transformer and the switch state of the grounding switch.
And 130, in the switching process of the main transformer for supplying power to the bus, if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state conditions, controlling the grounding mode of the grounding transformer according to the switching state of the main transformer, the switching state of the grounding transformer and the states of the sectional switches.
Specifically, referring to fig. 2, when the main transformer 1 fails or needs to be overhauled, the power supply main transformer of the section i bus needs to be transferred from the main transformer 1 to the main transformer 2, the section i bus and the section ii bus are connected through the sectionalized switch FD12, and the main transformer 2 supplies power for the section i bus and the section ii bus, so as to ensure that each section of bus works normally. When the power supply main transformer of the section I bus needs to be transferred from the main transformer 1 to the main transformer 2, if the switching state of the main transformer and the switching state of the grounding transformer, which are connected with the section I bus and the section II bus, respectively, meet preset switching state conditions of ZBi =1 and JDi =1, namely, the switching states of the high-voltage side circuit breaker BG1 and the low-voltage side circuit breaker BD1 of the main transformer 1 and the switching state of the high-voltage side circuit breaker BG2 and the low-voltage side circuit breaker BD2 of the main transformer 2 respectively meet ZBi =1, the switching state of the high-voltage side circuit breaker JD1 of the grounding transformer 1 and the switching state of the high-voltage side circuit breaker JD2 of the grounding transformer 2 respectively meet JDi =1, and the grounding arc extinction of the section I bus and the section II bus respectively are grounded through coils, the section FD12 is controlled to be closed, the low-voltage side circuit breaker BD1 of the main transformer 1 is opened, and the section FD12 is controlled to be opened, and the section 1 is also controlled to be opened by a preset time such as BD 8ms, so that the main transformer 1 is automatically switched to realize the power supply main transformer is reliably.
According to the control method for the grounding mode of the grounding transformer on the bus, whether the switching state of the main transformer and the switching state of the grounding transformer accord with the preset switching state condition or not is determined by acquiring the switching state of the main transformer electrically connected with the bus, the switching state of the grounding transformer electrically connected with the bus and the state of the sectionalizing switch between the buses, so that the grounding mode of the grounding transformer is controlled according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectionalizing switch if the switching state of the main transformer and the switching state of the grounding transformer accord with the preset switching state condition in the power supply main transformer switching process of the bus is determined. Compared with the existing control method of the grounding mode of the grounding change on the bus, the control method and the device of the grounding mode of the grounding change on the bus, provided by the embodiment, automatically switch the grounding mode of the grounding change on the bus according to the switch state of the main transformer, the switch state of the grounding change and the state of the sectionalizing switch, and do not need manual operation, so that the control reliability is improved.
Example two
Fig. 4 is a flowchart of a method for controlling a grounding mode of a bus with a grounding change, which is provided in a second embodiment of the present invention, where the method may be implemented by a device for controlling a grounding mode of a bus with a grounding change, and the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device, such as a computer, having a function of controlling a grounding mode of a bus with a grounding change, and specifically includes the following steps:
step 210, acquiring a switching state of a main transformer electrically connected with a bus, a switching state of a ground transformer electrically connected with the bus and a state of a sectionalizing switch between the buses.
The bus can be a 10kV bus, one end of the bus is electrically connected with the low-voltage side circuit breaker of the main transformer and the sectionalizing switch, and the other end of the bus is electrically connected with the high-voltage side circuit breaker of the grounding transformer. The switch states of the main transformer comprise the switch states of the two side disconnecting links of the low-voltage side breaker of the main transformer and the switch states of the low-voltage side breaker of the main transformer, and the switch states of the ground transformer comprise the switch states of the two side disconnecting links of the high-voltage side breaker of the ground transformer and the switch states of the high-voltage side breaker of the ground transformer. The control device of the grounding mode of the grounding transformer on the bus can acquire the switch state of the main transformer electrically connected with the bus, the switch state of the grounding transformer electrically connected with the bus and the state of the sectionalized switch between the buses through the input port arranged on the control device, so as to control the grounding mode of the grounding transformer on the bus.
Step 220, if the two side disconnecting link of the high-voltage side breaker of the main transformer are at the closing position, the two side disconnecting link of the low-voltage side breaker are at the closing position, and the high-voltage side breaker of the main transformer are at the closing position, and the low-voltage side breaker are at the closing position, determining that the switching state of the main transformer meets the first preset switching state condition.
Specifically, referring to fig. 2 and fig. 3, if the high-voltage side circuit breaker BG1 and the low-voltage side circuit breaker BD1 of the main transformer 1 are in the closed position and the two side switches of the high-voltage side circuit breaker BG1 and the low-voltage side circuit breaker BD1 of the main transformer 1 are in the closed position, the main transformer 1 meets a first preset switch state condition, that is, meets a preset switch state condition of ZBi =1.
Step 230, if the two side disconnecting link of the high-voltage side breaker of the main transformer are in the split position or the two side disconnecting link of the low-voltage side breaker are in the split position or the high-voltage side breaker of the main transformer are in the split position, determining that the switch state of the main transformer meets the second preset switch state condition.
Similarly, referring to fig. 2 and 3, if the high-voltage side circuit breaker BG1 of the main transformer 1 is separated into the separated position or the low-voltage side circuit breaker BD1 is separated into the separated position or the two side switches of the high-voltage side circuit breaker BG1 of the main transformer 1 are separated from each other, the BD1 and BG1 meet the second preset switch state condition, that is, the BD1 and BG1 meet the preset switch state condition of ZBi =0, and the two side switches of the low-voltage side circuit breaker BD1 of the main transformer 1 may be separated from each other.
Step 240, if the two side disconnecting link of the high-voltage side circuit breaker with the ground transformer is in the on-position and the high-voltage side circuit breaker with the ground transformer is in the on-position, determining that the on-off state of the ground transformer meets a third preset on-off state condition.
Specifically, referring to fig. 2, if the high-voltage side circuit breaker JD1 with the ground level 1 is in the closed position and the two side switches of the high-voltage side circuit breaker JD1 with the ground level 1 are in the closed position, the high-voltage side circuit breaker JD1 with the ground level 1 meets a third preset switch state condition, i.e. meets a preset switch state condition of JDi =1.
Step 250, if the disconnecting link at two sides of the high-voltage side circuit breaker with the ground change is in the split position or the high-voltage side circuit breaker with the ground change is in the split position, determining that the switch state of the ground change meets a fourth preset switch state condition.
Similarly, referring to fig. 2, if the high-voltage side circuit breaker JD1 with the ground level changed to 1 is in the split position or the two side switches of the high-voltage side circuit breaker JD1 with the ground level changed to 1 are in the split position, the high-voltage side circuit breaker JD1 with the ground level changed to 1 meets the fourth preset switch state condition, that is, meets the preset switch state condition of JDi =0. The switch at two sides of the high-voltage side breaker JD1 switch with the grounding change 1 can be one switch at the split position of the switch at two sides of the high-voltage side breaker JD1 switch with the grounding change 1.
Step 260, if the switch state of the main transformer meets the first preset switch state condition, the switch state of the grounding transformer meets the third preset switch state condition, the sectionalizing switch is in a sectionalizing state, and the grounding transformer of each section of bus electrically connected is grounded through a small resistor, the sectionalizing switch is controlled to be closed, the switch of the main transformer is opened, and the high-voltage side breaker of the grounding transformer is opened.
Specifically, fig. 5 is a schematic diagram of control logic of a grounding mode of a bus-bar grounding mode provided in the second embodiment of the present invention, in fig. 5, ZBi corresponds to BDi and BGi, ZBj corresponds to BDj and BGj, BGi and BDi respectively represent a high-voltage side circuit breaker and a low-voltage side circuit breaker of the main transformer i that have a fault or need to be repaired, BGj and BDj respectively represent a high-voltage side circuit breaker and a low-voltage side circuit breaker of the main transformer j, BDi and BDj are connected by a sectionalizer FDij, fdij=0 represents a sectionalizer FDij, the power supply main transformer of the bus-bar that is originally supplied by the main transformer i is converted to the main transformer j, the grounding on the bus-bar that is supplied by the main transformer i is defined as pi=0, the grounding on the main transformer of the main transformer i is defined as pi=1, Σp=0 represents the grounding on each section of the bus-bar that is supplied by the main transformer i and the main transformer j is connected by the small resistance, and the main transformer i is grounded by the small resistance on the main transformer i. Referring to fig. 2, 3 and 5, when the main transformer 1 fails or needs to be overhauled, the power supply main transformer of the section i bus is transferred from the main transformer 1 to the main transformer 2, if the switching state of the high-voltage side circuit breaker BG1, the switching state of the low-voltage side circuit breaker BD1 and the switching state of the high-voltage side circuit breaker BG2 of the main transformer 1, the switching state of the low-voltage side circuit breaker BD2 all conform to ZBi =1, the switching state of the high-voltage side circuit breaker JD1 of the ground transformer 1 and the switching state of the high-voltage side circuit breaker JD2 of the ground transformer 2 all conform to JDi =1, the section switch FD12 between the section i bus and the section ii bus is controlled to be closed at the split position, namely FD 12=0, and the ground transformer 1 and the ground transformer 2 all conform to Σp=0 through small resistors, the section switch FD12 can be controlled to be opened, and the low-voltage side circuit breaker BD1 of the main transformer 1 is opened.
In addition, if the switch state of the main transformer accords with the second preset switch state condition, and the switch state of the ground transformer accords with the fourth preset switch state condition, corresponding prompt information can be sent out so that relevant staff can take corresponding measures in time.
Step 270, if the switch state of the main transformer meets the first preset switch state condition, the switch state of the grounding transformer meets the third preset switch state condition, the sectional switch is in a split position, and the grounding transformers of all the electrically connected bus sections are grounded through the arc suppression coil, the sectional switch is controlled to be closed, and the switch of the main transformer is controlled to be opened.
Specifically, referring to fig. 2, 3 and 5, when the main transformer 1 fails or needs to be overhauled, the power supply main transformer of the section i bus is transferred from the main transformer 1 to the main transformer 2, if the switching state of the high-voltage side circuit breaker BG1, the switching state of the low-voltage side circuit breaker BD1 and the switching state of the high-voltage side circuit breaker BG2 and the switching state of the low-voltage side circuit breaker BD2 of the main transformer 1 respectively conform to ZBi =1, the switching state of the high-voltage side circuit breaker JD1 of the grounding transformer 1 and the switching state of the high-voltage side circuit breaker JD2 of the grounding transformer 2 respectively conform to JDi =1, and the section switch FD12 between the section i bus and the section ii bus is at the split position, namely FD 12=0, and the grounding transformer 1 and the grounding transformer 2 are grounded through the arc suppression coil, the section switch FD12 is controlled to be closed, and the low-voltage side circuit breaker BD1 of the main transformer 1 is opened.
Step 280, if the switch state of the main transformer meets the first preset switch state condition, and the switch state of the grounding transformer meets the third preset switch state condition, the sectional switch is in a split position, and the grounding transformer of each section of bus electrically connected is provided with a grounding transformer grounded through the arc suppression coil and a grounding transformer grounded through the small resistor, and then a corresponding alarm signal is sent out.
Specifically, referring to fig. 2, 3 and 5, when the main transformer 1 fails or needs to be overhauled, the power supply main transformer of the section i bus is transferred from the main transformer 1 to the main transformer 2, if the switching state of the high-voltage side circuit breaker BG1, the switching state of the low-voltage side circuit breaker BD1 and the switching state of the high-voltage side circuit breaker BG2 and the switching state of the low-voltage side circuit breaker BD2 of the main transformer 1 respectively conform to ZBi =1, the switching state of the high-voltage side circuit breaker JD1 of the grounding transformer 1 and the switching state of the high-voltage side circuit breaker JD2 of the grounding transformer 2 respectively conform to JDi =1, and if one of the section i bus and the section ii bus is grounded through an arc suppression coil in the switching position, namely FD 12=0, and the other is grounded through a small resistor, alarm information which cannot be configured can be sent out to prompt relevant staff to take measures in time.
According to the control method for the grounding mode of the grounding transformer on the bus, whether the switching state of the main transformer and the switching state of the grounding transformer meet the preset switching state condition is determined, and therefore, if the switching state of the main transformer and the switching state of the grounding transformer are determined to meet the preset switching state condition in the power supply main transformer switching process of the bus, the grounding mode of the grounding transformer is controlled according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectionalizing switch. Compared with the existing control method of the grounding mode of the grounding change on the bus, the control method and the device of the grounding mode of the grounding change on the bus, provided by the embodiment, automatically switch the grounding mode of the grounding change on the bus according to the switch state of the main transformer, the switch state of the grounding change and the state of the sectionalizing switch, and do not need manual operation, so that the control reliability is improved.
Example III
Fig. 6 is a block diagram of a control device for a grounding mode of a bus-bar grounding change, which includes a switch status acquisition module 310, a status condition determination module 320, and a grounding mode control module 330; the switch state acquisition module 310 is configured to acquire a switch state of a main transformer electrically connected to the bus, a switch state of a ground transformer electrically connected to the bus, and a state of a sectionalizing switch between the buses; the state condition determining module 320 is configured to determine whether the switch state of the main transformer and the switch state of the ground transformer meet a preset switch state condition; the grounding mode control module 330 is configured to control a grounding mode of the grounding transformer according to the switch state of the main transformer, the switch state of the grounding transformer and the state of the sectionalizing switch if it is determined that the switch state of the main transformer and the switch state of the grounding transformer meet the preset switch state condition during the switching process of the main transformer for supplying power to the bus.
Based on the above embodiment, the state condition determining module 320 includes a state condition determining unit, configured to determine that the on-off state of the main transformer meets a first preset on-off state condition if the two side disconnecting switches of the high-voltage side circuit breaker of the main transformer are in the on-position, the two side disconnecting switches of the low-voltage side circuit breaker are in the on-position, and the high-voltage side circuit breaker of the main transformer are in the on-position; and the method is also used for determining that the switching state of the main transformer meets the second preset switching state condition if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is in the split position or the disconnecting link at the two sides of the low-voltage side breaker is in the split position or the high-voltage side breaker of the main transformer is in the split position.
In one embodiment, the grounding mode control module 330 includes a grounding mode control module unit, which is configured to control the sectionalizing switch to be closed and the switch of the main transformer to be opened and the high-voltage side breaker to be opened if the main transformer switch meets the preset switch state conditions that the high-voltage side breaker, the low-voltage side breaker and the two side breakers of the high-voltage side breaker are both in the on-position.
Preferably, the grounding mode control module 330 includes a grounding mode control module unit, which is configured to control the sectionalizing switch to be closed and the main transformer switch to be opened if the main transformer switch meets the preset switch state conditions that the high-voltage side circuit breaker, the low-voltage side circuit breaker and the two side disconnecting links of the high-voltage side circuit breaker are all in the closing position, and the grounding mode control module unit is configured to control the sectionalizing switch to be closed and the two side disconnecting links of the main transformer switch are all in the preset switch state conditions that the high-voltage side circuit breaker and the two side disconnecting links of the high-voltage side circuit breaker are all in the closing position if the main transformer switch meets the high-voltage side circuit breaker, the low-voltage side circuit breaker and the two side disconnecting links of the high-voltage side circuit breaker are all in the grounding state of the arc suppression coil.
Preferably, the grounding mode control module 330 includes a grounding mode control module unit, which is configured to, if the switch of the main transformer accords with preset switch state conditions of the high-voltage side circuit breaker, the low-voltage side circuit breaker, and the two side disconnecting switches of the high-voltage side circuit breaker, and the two side disconnecting switches of the low-voltage side circuit breaker, the switch of the grounding transformer accords with preset switch state conditions of the high-voltage side circuit breaker and the two side disconnecting switches of the high-voltage side circuit breaker, the sectionalizing switch is in a separated position, and the grounding transformer of each section of bus electrically connected is provided with a grounding transformer grounded through the arc suppression coil and a grounding transformer grounded through the small resistor, and then a corresponding alarm signal is sent.
Preferably, the control device further includes a delay module, configured to delay a preset time and control a grounding mode of the grounding transformer.
The control device for the grounding mode of the bus provided by the embodiment and the control method for the grounding mode of the bus provided by any embodiment of the invention belong to the same invention conception, have corresponding beneficial effects, and the detailed technical details of the embodiment are not shown in the control method for the grounding mode of the bus provided by any embodiment of the invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A control method of a grounding mode of a grounding transformer on a bus is characterized by comprising the following steps:
acquiring a switching state of a main transformer electrically connected with a bus, a switching state of a grounding transformer electrically connected with the bus and a state of a sectionalizing switch between the buses;
determining whether the switch state of the main transformer and the switch state of the ground transformer meet preset switch state conditions or not; in the power supply main transformer switching process of a bus, if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state conditions, controlling the grounding mode of the grounding transformer according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectionalizing switch;
the determining whether the switch state of the main transformer meets the preset switch state condition comprises the following steps:
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is at the closing position, the disconnecting link at the two sides of the low-voltage side breaker is at the closing position, and the high-voltage side breaker of the main transformer is at the closing position, and the low-voltage side breaker is at the closing position, determining that the switching state of the main transformer meets a first preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is in the split position or the disconnecting link at the two sides of the low-voltage side breaker is in the split position or the high-voltage side breaker of the main transformer is in the split position, determining that the switching state of the main transformer meets a second preset switching state condition;
the determining whether the switch state of the grounding transformer meets the preset switch state condition comprises the following steps:
if the disconnecting link at the two sides of the high-voltage side circuit breaker with the grounding change is at the closing position and the high-voltage side circuit breaker with the grounding change is at the closing position, determining that the switching state of the grounding change meets a third preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side circuit breaker of the grounding transformer is in the split position or the high-voltage side circuit breaker of the grounding transformer is in the split position, determining that the switching state of the grounding transformer meets a fourth preset switching state condition.
2. The method for controlling a grounding mode of a grounding transformer on a bus bar according to claim 1, wherein the controlling the grounding mode of the grounding transformer according to the switching states of the main transformer and the grounding transformer and the state of the segment switch comprises:
if the switch of the main transformer accords with preset switch state conditions of the high-voltage side circuit breaker, the low-voltage side circuit breaker and the two side disconnecting links of the high-voltage side circuit breaker, and the two side disconnecting links of the low-voltage side circuit breaker are all in the on-position, the switch of the grounding transformer accords with preset switch state conditions of the high-voltage side circuit breaker and the two side disconnecting links of the high-voltage side circuit breaker, the sectionalizing switch is in the on-position, and the grounding transformer of each section of bus electrically connected is grounded through a small resistor, the sectionalizing switch is controlled to be closed, the switch of the main transformer is opened, and the high-voltage side circuit breaker of the grounding transformer is opened.
3. The method for controlling a grounding mode of a grounding transformer on a bus bar according to claim 1, wherein the controlling the grounding mode of the grounding transformer according to the switching states of the main transformer and the grounding transformer and the state of the segment switch comprises:
if the switch of the main transformer accords with preset switch state conditions of the high-voltage side breaker, the low-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, and the two side disconnecting links of the low-voltage side breaker, the switch of the grounding transformer accords with preset switch state conditions of the high-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, the sectionalizing switch is in a sectionalizing position, and the grounding transformer of each section of bus electrically connected is grounded through an arc suppression coil, the sectionalizing switch is controlled to be closed, and the switch of the main transformer is opened.
4. The method for controlling a grounding mode of a grounding transformer on a bus bar according to claim 1, wherein the controlling the grounding mode of the grounding transformer according to the switching states of the main transformer and the grounding transformer and the state of the segment switch comprises:
if the switch of the main transformer accords with the preset switch state conditions of the high-voltage side breaker, the low-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, and the two side disconnecting links of the low-voltage side breaker, and the switch of the grounding transformer accords with the preset switch state conditions of the high-voltage side breaker and the two side disconnecting links of the high-voltage side breaker, the sectionalizing switch is in a separated position, and the grounding transformer of each section of bus electrically connected is provided with a grounding transformer grounded through an arc suppression coil and a grounding transformer grounded through a small resistor, and corresponding alarm signals are sent out.
5. The method for controlling the grounding mode of the grounding switch on the bus bar according to claim 1, comprising, before the controlling the grounding mode of the grounding switch:
and delaying for a preset time to control the grounding mode of the grounding transformer.
6. The method for controlling a grounding mode of a grounding switch on a bus bar according to claim 1, wherein one end of the bus bar is electrically connected to a low-voltage side breaker of the main switch and the sectionalizing switch, and the other end of the bus bar is electrically connected to a high-voltage side breaker of the grounding switch.
7. The method for controlling a grounding mode of a grounding transformer on a bus according to claim 1, wherein the switching states of the main transformer comprise a switching state of a disconnecting link at two sides of a high-voltage side breaker of the main transformer, a switching state of a disconnecting link at two sides of a low-voltage side breaker, and a switching state of a high-voltage side breaker of the main transformer, and the switching states of the grounding transformer comprise a switching state of a disconnecting link at two sides of the high-voltage side breaker of the grounding transformer and a switching state of the high-voltage side breaker of the grounding transformer.
8. The method for controlling the grounding mode of the grounding transformer on the bus bar according to claim 1, wherein the voltage on the bus bar is 10kV.
9. A control device for a grounding mode of a bus-bar grounding change, comprising:
the switch state acquisition module is used for acquiring the switch state of the main transformer electrically connected with the bus, the switch state of the grounding transformer electrically connected with the bus and the state of the sectionalizing switch between the buses;
the state condition determining module is used for determining whether the switch state of the main transformer and the switch state of the grounding transformer meet preset switch state conditions or not;
the grounding mode control module is used for controlling the grounding mode of the grounding transformer according to the switching state of the main transformer, the switching state of the grounding transformer and the state of the sectionalized switch if the switching state of the main transformer and the switching state of the grounding transformer are determined to be in accordance with the preset switching state condition in the switching process of the main transformer for supplying power of the bus;
the state condition determining module includes a state condition determining unit configured to:
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is at the closing position, the disconnecting link at the two sides of the low-voltage side breaker is at the closing position, and the high-voltage side breaker of the main transformer is at the closing position, and the low-voltage side breaker is at the closing position, determining that the switching state of the main transformer meets a first preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side breaker of the main transformer is in the split position or the disconnecting link at the two sides of the low-voltage side breaker is in the split position or the high-voltage side breaker of the main transformer is in the split position, determining that the switching state of the main transformer meets a second preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side circuit breaker with the grounding change is at the closing position and the high-voltage side circuit breaker with the grounding change is at the closing position, determining that the switching state of the grounding change meets a third preset switching state condition;
if the disconnecting link at the two sides of the high-voltage side circuit breaker of the grounding transformer is in the split position or the high-voltage side circuit breaker of the grounding transformer is in the split position, determining that the switching state of the grounding transformer meets a fourth preset switching state condition.
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| CN202011164384.2A CN112260235B (en) | 2020-10-27 | 2020-10-27 | Control method and device for grounding mode of grounding transformer on bus |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004629A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of ground connection change protection system suitable for low resistance grounding |
| CN109149389A (en) * | 2018-09-14 | 2019-01-04 | 广东电网有限责任公司 | Ground connection becomes automatic switching method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3480671B2 (en) * | 1998-04-09 | 2003-12-22 | 株式会社日立製作所 | Bus protection system for spot network power receiving equipment |
| CN104333118B (en) * | 2014-10-29 | 2017-06-23 | 国家电网公司 | The spare power automatic switching system and its operation method of middle resistance earthing mode self adaptation switching |
| CN204424873U (en) * | 2014-12-26 | 2015-06-24 | 云南电力调度控制中心 | Substation transformer neutral ground disconnecting link device for intelligently switching |
| CN105552883B (en) * | 2015-12-16 | 2018-01-16 | 广东电网有限责任公司中山供电局 | Triple bus-bar is segmented the control method and system that transformer station is turned paired running by point row |
| CN105429141B (en) * | 2015-12-16 | 2018-09-25 | 广东电网有限责任公司中山供电局 | Substation bus bar is turned the control method and system of paired running by point row |
| CN106058829B (en) * | 2016-07-22 | 2018-08-17 | 广东电网有限责任公司揭阳供电局 | A kind of fault protection system for distribution system |
| CN111668922B (en) * | 2020-06-28 | 2022-07-26 | 深圳供电局有限公司 | 10kV spare power automatic switching action method for transformer substation |
-
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004629A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of ground connection change protection system suitable for low resistance grounding |
| CN109149389A (en) * | 2018-09-14 | 2019-01-04 | 广东电网有限责任公司 | Ground connection becomes automatic switching method and device |
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