CN112003239B - Control method and device for neutral point grounding mode of transformer - Google Patents
Control method and device for neutral point grounding mode of transformer Download PDFInfo
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- CN112003239B CN112003239B CN202010865355.2A CN202010865355A CN112003239B CN 112003239 B CN112003239 B CN 112003239B CN 202010865355 A CN202010865355 A CN 202010865355A CN 112003239 B CN112003239 B CN 112003239B
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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
- H02H7/04—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 transformers
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- H—ELECTRICITY
- 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
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Abstract
The embodiment of the invention discloses a control method and a device for a transformer neutral point grounding mode, wherein the control method comprises the following steps: collecting the voltage of the high-voltage side of the transformer; when the voltage of the high-voltage side of the transformer is a preset first voltage, determining the running state of a bus of the transformer; in the process of converting the transformer into hot standby, the state of a neutral point grounding disconnecting link of the transformer and the state of a transformer switch are controlled according to the voltage of the high-voltage side of the transformer and the running state of a bus of the transformer. The control method and the device for the grounding mode of the neutral point of the transformer can improve the reliability of control and the service life of the transformer.
Description
Technical Field
The embodiment of the invention relates to a power grid control technology, in particular to a control method and a control device for a neutral point grounding mode of a transformer.
Background
In a power grid, under a normal operation mode, a main transformer neutral point grounding mode is determined according to the power grid operation mode, and the main transformer is required to be turned into hot standby under the condition of transformer load transfer operation or accident of a transformer substation, and when the main transformer is turned into hot standby, corresponding operations are required to be carried out on all side switches and the main transformer neutral point of the main transformer so as to ensure that the transformer reliably completes the conversion of a hot standby state.
At present, in the existing control method of the grounding mode of the neutral point of the transformer, an operator writes a ticket, so that the speed is low and the reliability is poor, if the operation of the neutral point of the transformer is missed, the neutral point of the transformer is possibly over-voltage, the insulation life of the neutral point of the transformer is affected, and the service life of the transformer is affected.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device for a neutral point grounding mode of a transformer, so as to improve the reliability of control and the service life of the transformer.
In a first aspect, an embodiment of the present invention provides a method for controlling a grounding mode of a neutral point of a transformer, including:
collecting the voltage of the high-voltage side of the transformer;
when the voltage of the high-voltage side of the transformer is a preset first voltage, determining the running state of a bus of the transformer;
in the process of converting the transformer into hot standby, the state of a neutral point grounding disconnecting link of the transformer and the state of a transformer switch are controlled according to the voltage of the high-voltage side of the transformer and the running state of a bus of the transformer.
Optionally, controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer includes:
when the voltage of the high-voltage side of the transformer is a preset second voltage, detecting the state of a neutral point grounding disconnecting link of the transformer; wherein, the preset second voltage is 500kV;
if the neutral point grounding disconnecting link of the transformer is in an open state, sequentially controlling the low-voltage side switch of the transformer to be opened, the medium-voltage side switch of the transformer to be opened, the neutral point grounding disconnecting link of the transformer to be closed, the direct-isolation device grounding disconnecting link of the transformer to be opened and the high-voltage side switch of the transformer to be opened;
and if the neutral point grounding disconnecting link of the transformer is in a closed state, controlling the high-voltage side switch of the transformer to be opened.
Optionally, controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer includes:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the bus of the transformer runs in parallel, detecting the state of the neutral point grounding disconnecting link of the middle-voltage side of the transformer, the state of the neutral point grounding disconnecting link of the high-voltage side of the transformer and the state of the grounding disconnecting link of the high-voltage side blocking device of the transformer; the method comprises the steps of presetting a first voltage to 220kV;
if the neutral point grounding disconnecting link of the transformer medium voltage side, the neutral point grounding disconnecting link of the transformer high voltage side and the grounding disconnecting link of the direct-connection device are all in an open state, sequentially controlling the opening of the low voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the transformer medium voltage side, the opening of the neutral point grounding disconnecting link of the transformer medium voltage side, the closing of the neutral point grounding disconnecting link of the transformer high voltage side and the opening of the high voltage side switch of the transformer;
if the neutral point grounding disconnecting link of the transformer is in an open state and the grounding disconnecting link of the disconnecting device is in a closed state, sequentially controlling the opening of the low-voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the transformer, the opening of the neutral point grounding disconnecting link of the transformer, the closing of the neutral point grounding disconnecting link of the high-voltage side of the transformer, the opening of the grounding disconnecting link of the disconnecting device and the opening of the high-voltage side switch of the transformer;
and if the neutral point grounding disconnecting link of the medium voltage side of the transformer is in an open state and the neutral point grounding disconnecting link of the high voltage side of the transformer is in a closed state, sequentially controlling the opening of the low voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the medium voltage side of the transformer, the opening of the medium voltage side switch of the transformer and the opening of the high voltage side switch of the transformer.
Optionally, controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer includes:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the bus of the transformer runs in parallel, detecting the state of the neutral point grounding disconnecting link of the middle-voltage side of the transformer, the state of the neutral point grounding disconnecting link of the high-voltage side of the transformer and the state of the grounding disconnecting link of the high-voltage side blocking device of the transformer; the method comprises the steps of presetting a first voltage to 220kV;
if the neutral point grounding disconnecting link of the transformer is in a closed state, the neutral point grounding disconnecting link of the transformer high-voltage side and the grounding disconnecting link of the direct-isolation device are in an open state, sequentially controlling the disconnection of the low-voltage side switch of the transformer, the disconnection of the medium-voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the transformer high-voltage side and the disconnection of the high-voltage side switch of the transformer;
if the neutral point grounding disconnecting link of the middle voltage side and the neutral point grounding disconnecting link of the blocking device of the transformer are in a closed state, the other neutral point grounding disconnecting link of the blocking device of the high voltage side of the transformer is controlled to be closed, and the low voltage side switch of the transformer is controlled to be opened, the medium voltage side switch of the transformer is controlled to be opened, and the high voltage side switch of the transformer is controlled to be opened in sequence;
if the neutral point grounding disconnecting link of the middle voltage side of the transformer and the neutral point grounding disconnecting link of the high voltage side of the transformer are in a closed state, the neutral point grounding disconnecting link of the high voltage side of the other transformer of the transformer station where the transformer is located and the neutral point grounding disconnecting link of the middle voltage side of the other transformer are closed, and the low voltage side switch of the transformer, the medium voltage side switch of the transformer and the high voltage side switch of the transformer are controlled to be opened in sequence.
Optionally, controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer includes:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the transformer buses run in a split mode, controlling the state of a neutral point grounding disconnecting link of the transformer on the same bus and the state of a transformer switch; wherein, preset first voltage to 220kV.
Optionally, the operation logic of the transformer bus in-line operation is the same as the operation logic of the state of the control transformer neutral point grounding knife switch and the state of the transformer switch when the transformer buses are in parallel operation.
Optionally, controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer includes:
when the voltage of the high-voltage side of the transformer is a preset third voltage, detecting the state of a neutral point grounding disconnecting link of the high-voltage side of the transformer; wherein, the third voltage is preset to be 110kV;
if the neutral point grounding disconnecting link of the high-voltage side of the transformer is in an open state, sequentially controlling the switch of the low-voltage side of the transformer to be opened, and the neutral point grounding disconnecting link of the high-voltage side of the transformer to be closed and the switch of the high-voltage side of the transformer to be opened;
and if the neutral point grounding disconnecting link of the high-voltage side of the transformer is in a closed state, sequentially controlling the switch of the low-voltage side of the transformer to be opened and the switch of the high-voltage side of the transformer to be opened.
Optionally, the operation states of the transformer bus comprise a parallel operation state and a split operation state.
Optionally, the transformer switch comprises at least one of a transformer high side switch, a transformer medium side switch, and a transformer low side switch.
In a second aspect, an embodiment of the present invention further provides a control device for a grounding mode of a neutral point of a transformer, including:
the voltage acquisition module is used for acquiring the voltage of the high-voltage side of the transformer;
the state determining module is used for determining the running state of the bus of the transformer when the voltage of the high-voltage side of the transformer is a preset first voltage;
and the switch control module is used for controlling the state of the neutral point grounding disconnecting link of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the running state of the bus of the transformer in the process of transferring the transformer to hot standby.
According to the control method and the control device for the grounding mode of the neutral point of the transformer, provided by the embodiment of the invention, the voltage of the high-voltage side of the transformer is collected, when the voltage of the high-voltage side of the transformer is the preset first voltage, the running state of the bus of the transformer is determined, and in the process of transferring heat to standby of the transformer, the state of the neutral point grounding disconnecting link of the transformer and the state of the transformer switch are controlled according to the voltage of the high-voltage side of the transformer and the running state of the bus of the transformer. Compared with the existing control method of the grounding mode of the neutral point of the transformer, the control method and the device of the grounding mode of the neutral point of the transformer, provided by the embodiment of the invention, realize the heat conversion standby of the transformer by controlling the state of the grounding knife switch of the neutral point of the transformer and the state of the transformer switch, and prevent operators from missing the operation of the neutral point of the transformer to cause the overvoltage of the neutral point of the transformer so as to influence the reliability of control and the service life of the transformer, thereby improving the reliability of control and the service life of the transformer.
Drawings
Fig. 1 is a flowchart of a control method for a transformer neutral grounding mode according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a high-side 500kV transformer neutral point grounding according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method for a neutral point grounding mode of a transformer according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a grounding mode of a neutral point of a transformer with a high voltage side of 220kV according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a grounding mode of a neutral point of a transformer with a high voltage side of 110kV according to a second embodiment of the present invention;
fig. 6 is a block diagram of a control device for a transformer neutral point grounding mode 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 control method for a neutral point grounding mode of a transformer according to a first embodiment of the present invention, where the embodiment is applicable to a case of controlling the neutral point grounding mode of the transformer, and the method may be performed by a control device for the neutral point grounding mode of the transformer, where the device may be implemented by software and/or hardware, and where the device may be integrated into an electronic apparatus, such as a computer, having a control function for the neutral point grounding mode of the transformer, and the method specifically includes the following steps:
step 110, collecting the voltage of the high-voltage side of the transformer.
The control device of the grounding mode of the neutral point of the transformer can acquire the voltage of the high-voltage side of the transformer acquired by the voltage acquisition device through a port which is arranged on the control device and is electrically connected with the voltage acquisition device, so that the grounding mode of the neutral point of the transformer is controlled according to the voltage of the high-voltage side of the transformer.
And 120, determining the operation state of the bus of the transformer when the voltage of the high-voltage side of the transformer is a preset first voltage.
The preset first voltage may be 220kV, the operation state of the transformer bus includes a parallel operation state and a split operation state, when the voltage of the high-voltage side of the transformer is the preset first voltage, the operation state of the transformer bus may be determined by detecting states of a bus switch and two side knife switches on the transformer bus, if the bus switch and the two side knife switches are in a closed state, the transformer bus is in parallel operation, and if the bus switch or the two side knife switches are in an open state, the transformer bus is in split operation, so as to control a neutral point grounding mode of the transformer according to the operation state of the transformer bus.
And 130, in the process of converting the transformer into hot standby, controlling the state of a neutral point grounding disconnecting link of the transformer and the state of a transformer switch according to the voltage of the high-voltage side of the transformer and the running state of a bus of the transformer.
The transformer switch comprises at least one of a transformer high-voltage side switch, a transformer medium-voltage side switch and a transformer low-voltage side switch. When the voltage of the high-voltage side of the transformer is a preset first voltage, if the transformer buses run in a split mode, controlling the state of a neutral point grounding disconnecting link of the transformer on the same bus and the state of a transformer switch; the operation logic of the transformer bus in the split operation is the same as that of the state of the control transformer neutral point grounding disconnecting link and the state of the transformer switch when the transformer buses are in parallel operation.
Specifically, fig. 2 is a schematic diagram of grounding a neutral point of a transformer at a high voltage side of 500kV, which is provided by the first embodiment of the present invention, when a load of the transformer is transferred, that is, the transformer is used for transferring heat, the switch and the neutral point at each side of the transformer need to be operated, and currently, a main transformer of a 500kV transformer substation of a power system adopts an autotransformer, and the main transformer is grounded through a direct-isolation device or directly grounded. Referring to fig. 2, if the state of the transformer neutral point grounding knife switch ZJ is detected when the voltage of the high voltage side of the transformer is 500kV, if the transformer neutral point grounding knife switch ZJ is in the open state, the transformer neutral point is grounded through the blocking device grounding knife switch GJ, then the low voltage side switch of the transformer is opened 301, the medium voltage side switch of the transformer is opened 201, the transformer neutral point grounding knife switch ZJ is closed, the blocking device grounding knife switch GJ of the transformer is opened, and the high voltage side switches of the transformer 5011 and 5012 are opened; if the transformer neutral grounding knife switch ZJ is in a closed state, the transformer high- voltage side switches 5011 and 5012 are directly controlled to be opened. The state of the neutral point grounding disconnecting link of the transformer and the state of the transformer switch are controlled, so that the transformer is turned into hot standby, the reliability of the operation of the neutral point of the transformer is improved, and the phenomenon that the service life of the transformer is influenced due to overvoltage of the neutral point of the transformer caused by the omission of the operation of the neutral point of the transformer by an operator is prevented.
According to the control method for the grounding mode of the neutral point of the transformer, when the collected voltage of the high-voltage side of the transformer is the preset first voltage, the running state of the bus of the transformer is determined, and in the process of transferring heat to standby of the transformer, the state of the neutral point grounding disconnecting link of the transformer and the state of the switch of the transformer are controlled according to the voltage of the high-voltage side of the transformer and the running state of the bus of the transformer. Compared with the existing control method of the grounding mode of the neutral point of the transformer, the control method of the grounding mode of the neutral point of the transformer, provided by the embodiment, achieves the purpose of transferring the transformer to a hot standby by controlling the state of the grounding knife switch of the neutral point of the transformer and the state of the transformer switch, and prevents operators from missing the operation of the neutral point of the transformer to cause overvoltage of the neutral point of the transformer so as to influence the reliability of control and the service life of the transformer, thereby improving the reliability of the operation of the neutral point of the transformer and the service life of the transformer.
Example two
Fig. 3 is a flowchart of a control method for a neutral point grounding mode of a transformer according to a second embodiment of the present invention, where the present embodiment is applicable to a case of controlling the neutral point grounding mode of a transformer, and the method may be performed by a control device for the neutral point grounding mode of a transformer, 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 control function for the neutral point grounding mode of a transformer, and the method specifically includes the following steps:
The control device of the grounding mode of the neutral point of the transformer can acquire the voltage of the high-voltage side of the transformer acquired by the voltage acquisition device through a port which is arranged on the control device and is electrically connected with the voltage acquisition device, so that the grounding mode of the neutral point of the transformer is controlled according to the voltage of the high-voltage side of the transformer.
The preset first voltage can be 220kV, the grounding mode of the main transformer high neutral point of the 220kV transformer substation of the current power system comprises gap grounding, direct grounding and grounding through a blocking device, and the neutral point of the transformer comprises direct grounding and gap grounding; the high neutral point of the 110kV transformer substation comprises a mode of grounding through a gap and directly grounding; the main transformer of the 500kV transformer substation adopts an autotransformer, and the grounding mode of the main transformer is grounded through a direct-isolation device or directly grounded.
Specifically, fig. 4 is a schematic diagram of a grounding mode of a neutral point of a transformer with a high voltage side of 220kV, as shown in fig. 4, where it is determined that a bus L1 and a bus L1 are operated in a row or in parallel by detecting the switch states of a bus bar switch 2012 and two side knife switches, and if the bus bar switch 2012 and the two side knife switches are in a closed position, the bus L1 and the bus L2 are operated in parallel, and step 240 is executed; when the bus bar switch 2012 or the two-side knife switch is in the pulled position, the bus bar L1 and the bus bar L2 are operated in a split row, and step 287 is performed.
Step 240, detecting whether a neutral point grounding disconnecting link of a voltage side in the transformer is at a closing position; if so, go to step 250; if not, go to step 284.
Specifically, when the voltage at the high-voltage side of the transformer in the present embodiment is the preset first voltage, the transformer for heat transfer standby is exemplified by the transformer 1 in fig. 4, and if it is determined that the buses L1 and L2 are running in parallel by detecting the switching states of the bus bar switch 2012 and the two side knife switches during the heat transfer standby of the transformer 1, the state of the neutral point grounding knife switch ZJ12 at the medium-voltage side of the transformer 1 is detected.
When the neutral point grounding switch ZJ12 of the transformer 1 is in the closed state, the state of the neutral point grounding switch ZJ11 of the transformer 1 is detected.
Specifically, as shown in fig. 4, the transformer 1 is further provided with a transformer 2 and a transformer 3, and when it is determined that the buses L1 and L2 are operated in parallel, it is possible to detect whether or not the high-voltage side neutral points of the transformers 2 and 3 have a blocking device. In addition, when determining that the buses L1 and L2 are running in separate rows, it is only necessary to detect whether there is a blocking device on the same bus, i.e., the high-side neutral point of the transformer 2.
And 270, controlling the high-voltage side neutral point grounding disconnecting link and the medium-voltage side neutral point grounding disconnecting link of the transformer to be closed.
Specifically, when the buses L1 and L2 are operated in parallel, if no blocking device is detected at the high-voltage side neutral point of the transformer 2, the high-voltage side neutral point grounding switch ZJ21 and the medium-voltage side neutral point grounding switch ZJ22 of the transformer 2 are controlled to be closed.
After the high-voltage side neutral point grounding switch ZJ21 and the medium-voltage side neutral point grounding switch ZJ22 of the control transformer 2 are turned on, the low-voltage side switch 501, the medium-voltage side switch 1101, and the high-voltage side switch 2201 of the control transformer 1 are sequentially turned off. The state of the high-side switch 2201 of the transformer 1 may be detected first, and the high-side switch 2201 of the transformer 1 is controlled to be opened if it is in the closed state, and the high-side switch 2201 of the transformer 1 is not required to be operated if it is in the open state.
And 281, controlling the grounding disconnecting link of the high-voltage side neutral point blocking device of one transformer and the grounding disconnecting link of the medium-voltage side neutral point to be closed.
Specifically, when it is detected that the high-voltage side neutral point of the transformer 3 has a blocking device, the high-voltage side neutral point blocking device grounding knife switch GZ3 and the medium-voltage side neutral point grounding knife switch ZJ32 of the transformer 3 are controlled to be closed, and the step 280 is continuously executed.
And 282, sequentially controlling the opening of the low-voltage side switch of the transformer, the opening of the medium-voltage side switch of the transformer and the closing of the neutral point grounding disconnecting link of the high-voltage side of the transformer.
When detecting that the high-voltage neutral point grounding switch ZJ11 of the transformer is turned off, the low-voltage switch 501 of the transformer 1, the medium-voltage switch 1101, and the high-voltage neutral point grounding switch ZJ11 are sequentially controlled to be turned off. The state of the medium-voltage side switch 1101 of the transformer 1 can be detected, and if the medium-voltage side switch 1101 of the transformer 1 is in the closed state, the opening thereof is controlled, and if the medium-voltage side switch 1101 of the transformer 1 is in the open state, the operation thereof is not required.
If the neutral point grounding knife switch ZJ12 of the transformer 1 is in the open state and the direct current blocking device grounding knife switch GZ1 is in the closed state, the low-voltage side switch 501 of the transformer 1, the neutral point grounding knife switch ZJ12 of the medium voltage side switch 1101 is closed, the neutral point grounding knife switch ZJ11 of the high voltage side switch ZJ11 is closed, and the direct current blocking device grounding knife switch GZ1 is opened and the high-voltage side switch 2201 is opened.
And 284, sequentially controlling the low-voltage side switch of the transformer to be opened, the neutral point grounding disconnecting link of the medium-voltage side of the transformer to be closed, and the medium-voltage side switch of the transformer to be opened.
Specifically, when detecting that the neutral point grounding knife switch ZJ12 on the medium voltage side of the transformer 1 is opened, the low voltage side switch 501 of the transformer 1 is opened, the neutral point grounding knife switch ZJ12 on the medium voltage side is closed, and the medium voltage side switch 1101 is opened.
If the neutral point grounding switch ZJ12, the high-voltage neutral point grounding switch ZJ11, and the disconnecting device grounding switch GZ1 of the transformer 1 are all in the open state, the low-voltage side switch 501, the neutral point grounding switch ZJ12, the medium-voltage side switch 1101, the high-voltage neutral point grounding switch ZJ11, and the high-voltage side switch 2201 of the transformer 1 are sequentially controlled to be opened.
And 286, controlling the grounding disconnecting link of the blocking device to be disconnected.
Specifically, if it is detected that the dc blocking device grounding knife switch GZ1 of the transformer 1 is in the closed state, the dc blocking device grounding knife switch GZ1 is controlled to be opened.
Specifically, if the bus L1 and the bus L1 are determined to run in a row according to the bus bar switch 2012 and the switch states of the two side switches, the state of the neutral point grounding switch of the transformer 1, the state of the neutral point grounding switch of the transformer 2, and the state of the switch of the transformer 2 are controlled, and the control process is the same as the operation logic of the control process when the buses run in parallel, that is, the process returns to step 240 to continue.
288, judging whether the voltage of the high-voltage side of the transformer is a preset second voltage; if so, go to step 289; if not, step 292 is performed.
The preset second voltage may be 500kV, and when it is determined that the voltage at the high-voltage side of the transformer is not the preset first voltage, it is determined whether the voltage at the high-voltage side of the transformer is the preset second voltage.
Specifically, referring to fig. 2, if the voltage at the high-voltage side of the transformer is a preset second voltage, it is detected whether the neutral point grounding switch ZJ of the transformer is in the closed position.
When the neutral point grounding disconnecting link ZJ of the detection transformer is positioned at the on position, the high- voltage side switches 5011 and 5012 of the control transformer are disconnected.
Specifically, when it is detected that the transformer neutral grounding switch ZJ is opened, the transformer neutral grounding switch ZJ is controlled to be closed, and the step 290 is returned.
The preset third voltage may be 110kV, and when it is determined that the voltage at the high-voltage side of the transformer is not the preset second voltage, it is determined whether the voltage at the high-voltage side of the transformer is the preset third voltage.
And 294, controlling the high-voltage side neutral point of the transformer to be grounded and closing a disconnecting link.
Specifically, fig. 5 is a schematic diagram of a grounding mode of a transformer neutral point at a high-voltage side 110kV according to the second embodiment of the present invention, and as shown in fig. 5, if it is detected that the grounding switch ZJ4 at the high-voltage side of the transformer is opened, the switch 504 at the low-voltage side of the transformer is controlled to be opened, and the grounding switch ZJ4 at the high-voltage side of the transformer is controlled to be closed.
Step 295, controlling the high-side switch of the transformer to be turned off.
Specifically, if it is detected that the neutral point grounding knife switch ZJ4 on the high-voltage side of the transformer is in the on position, the low-voltage side switch 504 of the transformer is controlled to be turned off, and the high-voltage side switch 1104 of the transformer is controlled to be turned off.
According to the control method for the grounding mode of the neutral point of the transformer, whether the collected voltage of the high-voltage side of the transformer is the preset first voltage, the preset second voltage and the preset third voltage is judged, and the state of the grounding disconnecting link of the neutral point of the transformer and the state of the transformer switch are correspondingly controlled when the corresponding preset voltage is obtained. Compared with the existing control method of the grounding mode of the neutral point of the transformer, the control method of the grounding mode of the neutral point of the transformer, provided by the embodiment, achieves the purpose of transferring the transformer to a hot standby state by controlling the state of the grounding knife switch of the neutral point of the transformer and the state of the transformer switch, improves the reliability of the operation of the neutral point of the transformer, and prevents the operation of the neutral point of the transformer from being missed by operators to cause overvoltage of the neutral point of the transformer so as to influence the service life of the transformer.
Example III
Fig. 6 is a block diagram of a control device for a neutral point grounding mode of a transformer according to a third embodiment of the present invention, where the device includes a voltage acquisition module 310, a state determination module 320, and a switch control module 330; the voltage acquisition module 310 is used for acquiring the voltage of the high-voltage side of the transformer; the state determining module 320 is configured to determine an operation state of the bus of the transformer when the voltage of the high-voltage side of the transformer is a preset first voltage; the switch control module 330 is used for controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the running state of the bus of the transformer in the process of transferring the transformer to hot standby.
On the basis of the above embodiment, the switch control module 330 includes a state detection unit and a switch control unit, where the state detection unit is configured to detect a state of the neutral point grounding switch of the transformer when the voltage on the high-voltage side of the transformer is a preset second voltage; wherein, the preset second voltage is 500kV; the switch control unit is used for sequentially controlling the neutral point grounding switch of the transformer to be closed and the direct-isolation device grounding switch of the transformer to be opened and the high-voltage side switch of the transformer to be opened if the neutral point grounding switch of the transformer is in an opened state; the switch control unit is also used for controlling the high-voltage side switch of the transformer to be opened if the neutral point grounding disconnecting link of the transformer is in a closed state.
In one embodiment, the switch control module 330 includes a state detection unit and a switch control unit, where the state detection unit is configured to detect a state of a neutral point grounding switch on the high-voltage side of the transformer, a state of the neutral point grounding switch on the high-voltage side of the transformer, and a state of a grounding switch of a high-voltage side blocking device of the transformer if the transformer bus is operated in parallel when the voltage on the high-voltage side of the transformer is a preset first voltage; the method comprises the steps of presetting a first voltage to 220kV; the switch control unit is used for sequentially controlling the disconnection of the transformer low-voltage side switch, the disconnection of the transformer medium-voltage side neutral point grounding switch, the disconnection of the transformer medium-voltage side switch, the disconnection of the transformer high-voltage side neutral point grounding switch and the disconnection of the transformer high-voltage side switch if the neutral point grounding switch of the transformer medium-voltage side, the grounding switch of the transformer high-voltage side neutral point grounding switch and the disconnecting device grounding switch are all in the disconnection state; the switch control unit is also used for sequentially controlling the disconnection of the low-voltage side switch of the transformer, the closing of the neutral point grounding switch of the medium-voltage side of the transformer, the disconnection of the neutral point grounding switch of the medium-voltage side of the transformer, the closing of the neutral point grounding switch of the high-voltage side of the transformer, the disconnection of the grounding switch of the direct-current blocking device and the disconnection of the high-voltage side switch of the transformer if the neutral point grounding switch of the medium-voltage side of the transformer is in an open state and the grounding switch of the direct-current blocking device is in a closed state; the switch control unit is also used for sequentially controlling the disconnection of the transformer low-voltage side switch, the disconnection of the transformer medium-voltage side neutral point grounding switch, the disconnection of the transformer medium-voltage side switch and the disconnection of the transformer high-voltage side switch if the transformer medium-voltage side neutral point grounding switch is in an disconnected state and the transformer high-voltage side neutral point grounding switch is in a closed state.
Preferably, the switch control module 330 includes a state detection unit and a switch control unit, where the state detection unit is configured to detect a state of a neutral point grounding switch on the high-voltage side of the transformer, a state of the neutral point grounding switch on the high-voltage side of the transformer, and a state of a grounding switch of a high-voltage side blocking device of the transformer if the bus bars of the transformer are operated in parallel when the voltage on the high-voltage side of the transformer is a preset first voltage; the method comprises the steps of presetting a first voltage to 220kV; the switch control unit is used for sequentially controlling the disconnection of the transformer low-voltage side switch, the disconnection of the transformer medium-voltage side switch, the disconnection of the transformer high-voltage side neutral point grounding disconnecting link and the disconnection of the transformer high-voltage side switch if the transformer medium-voltage side neutral point grounding disconnecting link is in a closed state and the transformer high-voltage side neutral point grounding disconnecting link and the disconnecting link are in an open state; the switch control unit is also used for controlling the grounding disconnecting link of the neutral point of the middle voltage side and the grounding disconnecting link of the neutral point of the middle voltage side of the transformer to be closed if the grounding disconnecting link of the neutral point of the middle voltage side and the grounding disconnecting link of the neutral point of the middle voltage side of the transformer are both in a closed state, and sequentially controlling the switch of the low voltage side of the transformer to be opened, the switch of the middle voltage side of the transformer to be opened and the switch of the high voltage side of the transformer to be opened; the switch control unit is further used for closing the neutral point grounding switch and the neutral point grounding switch of the middle voltage side of the transformer substation, and sequentially controlling the switch on the low voltage side of the transformer, the switch on the middle voltage side of the transformer and the switch on the high voltage side of the transformer to be opened if the neutral point grounding switch of the middle voltage side of the transformer and the neutral point grounding switch of the high voltage side of the transformer are in the closed state.
Preferably, the switch control module 330 includes a switch control unit, configured to control a state of a neutral point grounding switch of the transformer and a state of a switch of the transformer on the same bus if the bus of the transformer is operated in a split mode when the voltage of the high-voltage side of the transformer is a preset first voltage; wherein, preset first voltage to 220kV.
Preferably, the switch control module 330 includes a state detection unit and a switch control unit, where the state detection unit is configured to detect a state of a neutral point grounding switch on the high-voltage side of the transformer when the voltage on the high-voltage side of the transformer is a preset third voltage; wherein, the third voltage is preset to be 110kV; the switch control unit is used for sequentially controlling the switch on the low-voltage side of the transformer to be opened and the neutral point grounding switch on the high-voltage side of the transformer to be closed if the neutral point grounding switch on the high-voltage side of the transformer is in an opened state; the switch control unit is also used for sequentially controlling the opening of the low-voltage side switch of the transformer and the opening of the high-voltage side switch of the transformer if the neutral point grounding knife switch of the high-voltage side of the transformer is in a closed state.
The control device for the grounding mode of the neutral point of the transformer provided by the embodiment and the control method for the grounding mode of the neutral point of the transformer provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and are not shown in detail in the technical details of the embodiment.
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. The control method of the grounding mode of the neutral point of the transformer is characterized by comprising the following steps:
collecting the voltage of the high-voltage side of the transformer;
when the voltage of the high-voltage side of the transformer is a preset first voltage, determining the running state of a bus of the transformer;
in the process of converting the transformer into hot standby, controlling the state of a neutral point grounding disconnecting link of the transformer and the state of a transformer switch according to the voltage of the high-voltage side of the transformer and the running state of a bus of the transformer;
the control of the state of the neutral point grounding disconnecting link of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the operation state of the bus of the transformer comprises the following steps:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the transformer buses run in parallel, detecting the state of a neutral point grounding disconnecting link of the medium-voltage side of the transformer, the state of the neutral point grounding disconnecting link of the high-voltage side of the transformer and the state of a grounding disconnecting link of a high-voltage side blocking device of the transformer; wherein the preset first voltage is 220kV;
if the neutral point grounding disconnecting link of the transformer medium voltage side, the neutral point grounding disconnecting link of the transformer high voltage side and the grounding disconnecting link of the disconnecting device are all in an open state, sequentially controlling the opening of the transformer low voltage side switch, the closing of the neutral point grounding disconnecting link of the transformer medium voltage side, the opening of the transformer medium voltage side switch, the closing of the neutral point grounding disconnecting link of the transformer high voltage side and the opening of the transformer high voltage side switch;
if the neutral point grounding disconnecting link of the transformer is in an open state and the grounding disconnecting link of the blocking device is in a closed state, sequentially controlling the opening of the low-voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the transformer, the opening of the medium-voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the high-voltage side of the transformer, the opening of the grounding disconnecting link of the blocking device and the opening of the high-voltage side switch of the transformer;
and if the neutral point grounding disconnecting link of the medium voltage side of the transformer is in an open state and the neutral point grounding disconnecting link of the high voltage side of the transformer is in a closed state, sequentially controlling the opening of the low voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the medium voltage side of the transformer, the opening of the medium voltage side switch of the transformer and the opening of the high voltage side switch of the transformer.
2. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high voltage side of the transformer and the operation state of the bus bar of the transformer comprises:
when the voltage of the high-voltage side of the transformer is a preset second voltage, detecting the state of a neutral point grounding disconnecting link of the transformer; wherein the preset second voltage is 500kV;
if the neutral point grounding disconnecting link of the transformer is in an open state, sequentially controlling the opening of a low-voltage side switch of the transformer, the opening of a medium-voltage side switch of the transformer, the closing of the neutral point grounding disconnecting link of the transformer, the opening of a direct-isolation device grounding disconnecting link of the transformer and the opening of a high-voltage side switch of the transformer;
and if the neutral point grounding disconnecting link of the transformer is in a closed state, controlling the high-voltage side switch of the transformer to be opened.
3. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high voltage side of the transformer and the operation state of the bus bar of the transformer comprises:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the transformer buses run in parallel, detecting the state of a neutral point grounding disconnecting link of the medium-voltage side of the transformer, the state of the neutral point grounding disconnecting link of the high-voltage side of the transformer and the state of a grounding disconnecting link of a high-voltage side blocking device of the transformer; wherein the preset first voltage is 220kV;
if the neutral point grounding disconnecting link of the transformer medium voltage side is in a closed state, and the neutral point grounding disconnecting link of the transformer high voltage side and the grounding disconnecting link of the disconnecting device are in an open state, sequentially controlling the disconnection of the transformer low voltage side switch, the disconnection of the transformer medium voltage side switch, the closing of the neutral point grounding disconnecting link of the transformer high voltage side and the disconnection of the transformer high voltage side switch;
if the neutral point grounding disconnecting link of the middle voltage side of the transformer and the neutral point grounding disconnecting link of the blocking device are in a closed state, the grounding disconnecting link of the blocking device of the high voltage side of the other transformer of the transformer station where the transformer is located and the neutral point grounding disconnecting link of the middle voltage side of the other transformer are controlled to be closed, and the low voltage side switch of the transformer is controlled to be opened, the medium voltage side switch of the transformer is controlled to be opened, and the high voltage side switch of the transformer is controlled to be opened in sequence;
if the neutral point grounding disconnecting link of the middle voltage side of the transformer and the neutral point grounding disconnecting link of the high voltage side of the transformer are in a closed state, the neutral point grounding disconnecting link of the other high voltage side of the transformer station where the transformer is located and the neutral point grounding disconnecting link of the middle voltage side are closed, and the low voltage side switch of the transformer, the medium voltage side switch of the transformer and the high voltage side switch of the transformer are controlled to be opened in sequence.
4. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high voltage side of the transformer and the operation state of the bus bar of the transformer comprises:
when the voltage of the high-voltage side of the transformer is a preset first voltage, if the transformer buses run in a split mode, controlling the state of a neutral point grounding disconnecting link of the transformer on the same bus and the state of a transformer switch; wherein the preset first voltage is 220kV.
5. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the operation logic of the transformer bus bar in-line operation is the same as the operation logic of the state of the neutral point grounding knife switch of the transformer and the state of the transformer switch when the transformer bus bars are operated in parallel.
6. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the controlling the state of the neutral point grounding switch of the transformer and the state of the transformer switch according to the voltage of the high voltage side of the transformer and the operation state of the bus bar of the transformer comprises:
when the voltage of the high-voltage side of the transformer is a preset third voltage, detecting the state of a neutral point grounding disconnecting link of the high-voltage side of the transformer; wherein the preset third voltage is 110kV;
if the neutral point grounding disconnecting link of the high-voltage side of the transformer is in an open state, sequentially controlling the switch of the low-voltage side of the transformer to be opened, the neutral point grounding disconnecting link of the high-voltage side of the transformer to be closed and the switch of the high-voltage side of the transformer to be opened;
and if the neutral point grounding disconnecting link of the high-voltage side of the transformer is in a closed state, sequentially controlling the switch of the low-voltage side of the transformer to be opened and the switch of the high-voltage side of the transformer to be opened.
7. The method for controlling a grounding mode of a neutral point of a transformer according to claim 1, wherein the operation states of the bus bars of the transformer include a parallel operation state and a split operation state.
8. The method of claim 1, wherein the transformer switch comprises at least one of a transformer high side switch, a transformer medium side switch, and a transformer low side switch.
9. A control device for a transformer neutral point grounding mode, comprising:
the voltage acquisition module is used for acquiring the voltage of the high-voltage side of the transformer;
the state determining module is used for determining the running state of the bus of the transformer when the voltage of the high-voltage side of the transformer is a preset first voltage;
the switch control module is used for controlling the state of the neutral point grounding disconnecting link of the transformer and the state of the transformer switch according to the voltage of the high-voltage side of the transformer and the running state of the bus of the transformer in the process of transferring the transformer to hot standby;
the switch control module includes: a state detection unit and a switch control unit;
the state detection unit is used for detecting the state of the neutral point grounding disconnecting link of the middle voltage side of the transformer, the state of the neutral point grounding disconnecting link of the high voltage side of the transformer and the state of the grounding disconnecting link of the high voltage side of the transformer if the bus of the transformer runs in parallel when the voltage of the high voltage side of the transformer is a preset first voltage; the method comprises the steps of presetting a first voltage to 220kV;
the switch control unit is used for sequentially controlling the disconnection of the transformer low-voltage side switch, the disconnection of the transformer medium-voltage side neutral point grounding switch, the disconnection of the transformer medium-voltage side switch, the disconnection of the transformer high-voltage side neutral point grounding switch and the disconnection of the transformer high-voltage side switch if the neutral point grounding switch of the transformer medium-voltage side, the grounding switch of the transformer high-voltage side and the grounding switch of the blocking device are all in the disconnection state;
the switch control unit is further used for sequentially controlling the opening of the transformer low-voltage side switch, the closing of the transformer medium-voltage side neutral point grounding switch, the opening of the transformer medium-voltage side switch, the closing of the transformer high-voltage side neutral point grounding switch, the opening of the direct-current blocking device grounding switch and the opening of the transformer high-voltage side switch if the transformer medium-voltage side neutral point grounding switch is in an open state and the direct-current blocking device grounding switch is in a closed state;
and the switch control unit is also used for sequentially controlling the disconnection of the transformer low-voltage side switch, the disconnection of the transformer medium-voltage side neutral point grounding switch, the disconnection of the transformer medium-voltage side switch and the disconnection of the transformer high-voltage side switch if the transformer medium-voltage side neutral point grounding switch is in an disconnected state and the transformer high-voltage side neutral point grounding switch is in a closed state.
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| 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 |
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