CN111224342A - Transformer anti-misoperation topology five-prevention design method based on dispatching automation system - Google Patents
Transformer anti-misoperation topology five-prevention design method based on dispatching automation system Download PDFInfo
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- CN111224342A CN111224342A CN202010201403.8A CN202010201403A CN111224342A CN 111224342 A CN111224342 A CN 111224342A CN 202010201403 A CN202010201403 A CN 202010201403A CN 111224342 A CN111224342 A CN 111224342A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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Abstract
The invention discloses a transformer anti-misoperation topology five-prevention design method based on a dispatching automation system, which mainly aims at two different wiring modes of a transformer substation: 1. the transformer substation adopts an internal bridge connection mode. 2. The high-voltage side of the transformer is provided with a wiring mode of a switch. Before the transformer is powered on and off, if the neutral point grounding knife switch of the transformer is in the closing position, the five-prevention check is passed, the switch on and off operation is allowed to be carried out, otherwise, the five-prevention check fails, the neutral point grounding knife of the transformer is prompted to be in the opening position, and the five-prevention check is not passed. The invention designs the five-prevention function for preventing misoperation of the transformer in the existing dispatching automation system, before the transformer with the voltage class of 110kV or above is powered off, the grounding switch of the neutral point of the transformer is required to be detected to be closed, and the power-off and power-on operation of the transformer is allowed to be carried out, thereby thoroughly solving the problem of transformer operation leakage in the technical aspect.
Description
Technical Field
The invention belongs to the technical field of power grid dispatching, and particularly relates to a transformer anti-misoperation topology five-prevention design method based on a dispatching automation system.
Background
The five-prevention is a reliable guarantee for preventing misoperation of the power system. The general five-prevention is to prevent five kinds of misoperation accidents frequently occurring in the switching operation of the power system, namely, mistaken switching-on and switching-off of a switch, a load-carrying switching-on and switching-off of an isolating switch, a grounding switch and a grounding interval. The anti-misoperation topology five-prevention design for the transformer is designed in the power-on and power-off operation of the transformer with the voltage class of 110kV or above, particularly when emergency power failure is needed in accident handling, if leakage occurs in the operation, a neutral point grounding switch of the transformer is not switched on before the switch on the power supply side is switched off or switched on, overvoltage in the operation of the transformer can be caused, the insulation of the transformer is endangered, and the transformer is damaged; in the existing network five-prevention function, only grounding in the system is detected to prohibit the equipment power transmission operation before the equipment power transmission, therefore, in order to completely solve the problem of transformer operation leakage in the technical aspect, in the existing dispatching automation system, the transformer anti-misoperation five-prevention function is designed, and before the transformer with the voltage level of 110kV or above is powered off, the grounding switch of the neutral point of the transformer must be detected to be closed, so that the power-off and power-transmission operation of the transformer is allowed.
Disclosure of Invention
The invention aims to provide a transformer anti-misoperation topology five-prevention design method of a dispatching automation system aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transformer anti-misoperation topology five-prevention design method based on a dispatching automation system mainly aims at two different wiring modes of a transformer substation: 1. the transformer substation adopts an internal bridge connection mode. 2. The high-voltage side of the transformer is provided with a wiring mode of a switch. Before the transformer is powered on and off, if the neutral point grounding knife switch of the transformer is in the closing position, the five-prevention check is passed, the switch on and off operation is allowed to be carried out, otherwise, the five-prevention check fails, the neutral point grounding knife of the transformer is prompted to be in the opening position, and the five-prevention check is not passed.
(1) When the wiring mode of the transformer substation is a wiring mode that a switch is arranged on the high-voltage side of a transformer:
when the switch is switched on/off 101, if the neutral point 1010 grounding disconnecting link of the No. 1 main transformer is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the grounding disconnecting link of the neutral point 1010 of the No. 1 main transformer is prompted to be in the off position, and the operation is forbidden; similarly, when the on/off 102 switch is performed, if the neutral point 1020 of the No. 2 main transformer is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the neutral point 1020 of the No. 2 main transformer is in the off position, and the operation is prohibited;
(2) when the wiring mode of the transformer substation is an internal bridge wiring mode, the five-prevention design method is divided into the following 3 conditions:
1) when the switch is switched on/off 103, if the switch 100 is in the on position, the loop closing operation is performed, the five-prevention check does not need to judge whether the neutral point grounding disconnecting link of the main transformer No. 1 is on, if the switch 100 is in the off position, the five-prevention check needs to judge whether the neutral point grounding disconnecting link of the main transformer No. 1 is on, if the neutral point 1010 grounding disconnecting link of the main transformer No. 1 is in the on position, the five-prevention check passes, the operation can be continued, otherwise, the five-prevention check fails, and the neutral point 1010 grounding disconnecting link of the main transformer No. 1 is prompted to be in the off position, and the operation is forbidden;
2) when the switch is switched on/off 104, if the switch 100 is in the on position, the operation is closed loop operation, five-prevention verification does not need to judge whether the neutral point grounding disconnecting link of the No. 2 main transformer is switched on, if the switch 100 is in the off position, the five-prevention verification needs to judge whether the neutral point grounding link of the No. 2 main transformer is switched on, if the neutral point 1010 grounding disconnecting link of the No. 2 main transformer is in the on position, the five-prevention verification passes, the operation can be continued, otherwise, the five-prevention verification fails, and the grounding disconnecting link of the No. 2 main transformer 110kV neutral point 1020 is prompted to be in the off position, and the operation is forbidden;
3) when 100 switches are switched on/off, if the switches 103 and 104 are switched on, the operation is closed loop operation, five-prevention verification does not need to judge the position of the neutral point grounding disconnecting link of the main transformer, if the switch 103 is switched on and the switch 104 is switched off, the five-prevention verification needs to judge whether the neutral point of the No. 2 main transformer is switched on, if the neutral point 1010 grounding disconnecting link of the No. 2 main transformer is switched on, the five-prevention verification passes, the operation can be continued, otherwise, the five-prevention verification fails, and the grounding disconnecting link 1020 of the No. 2 main transformer is switched off and the operation is forbidden; if the switch 104 is switched on and the switch 103 is switched off, the five-prevention check needs to judge whether the neutral point of the No. 1 main transformer is switched on, if the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched on, the five-prevention check is passed and the operation can be continued, otherwise, the five-prevention check fails, and the operation is forbidden when the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched off.
The invention has the advantages that:
in the existing system operation, the power cut and transmission operation of the transformer with the voltage class of 110kV and above does not need to judge whether the neutral point grounding disconnecting link of the transformer is in the closed position, the power cut and transmission of the transformer without the neutral point grounding disconnecting link are easily caused, the insulation of the transformer is possibly endangered in serious cases, the transformer is damaged, along with the improvement of the dispatching automation level, in order to ensure the correctness of the power-on and power-off operation of the transformer, the anti-misoperation topology five-prevention design of the transformer is that before the transformer is powered on and powered off, if the transformer neutral point grounding knife switch is in the closing position, the five-prevention check is passed, the switch on-off operation is allowed to be carried out, otherwise, the five-prevention inspection fails, the grounding knife of the neutral point of the transformer is prompted to be in a pulling-open position, the five-prevention inspection does not pass, the transformer can be prevented from carrying out power cut and transmission operation without the neutral point technically, and the safety of equipment operation is ensured.
Drawings
Fig. 1 is a schematic circuit diagram of a wiring mode of a transformer with a switch on the high-voltage side in a transformer substation.
Fig. 2 is a schematic diagram of a five-prevention design process of the on/off 101 switch in fig. 1.
Fig. 3 is a schematic diagram of a five-prevention design process of the on/off switch 102 in fig. 1.
Fig. 4 is a schematic diagram of a circuit principle of an internal bridge connection mode in a transformer substation.
Fig. 5 is a schematic diagram of a five-prevention design flow of the on/off 103 switch in fig. 4.
Fig. 6 is a schematic diagram of a five-prevention design flow of the on/off switch 104 in fig. 4.
Fig. 7 is a schematic diagram of a five-prevention design process of the on/off 100 switch in fig. 4.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example (b):
before power is cut off and transmitted to the transformer, if a neutral point grounding knife switch of the transformer is in a closed position, five-prevention verification is passed, switch opening and closing operation is allowed to be carried out, otherwise, five-prevention verification fails, the neutral point grounding knife of the transformer is prompted to be in an open position, and five-prevention verification is not passed.
(1) When the wiring mode of the transformer substation is a wiring mode with a switch at the high-voltage side of the transformer (as shown in fig. 1):
when the on/off 101 switch is performed (as shown in fig. 2), if the grounding disconnecting link of the neutral point 1010 of the No. 1 main transformer is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the grounding disconnecting link of the neutral point 1010 of the No. 1 main transformer is prompted to be in the off position, and the operation is forbidden; similarly, when the on/off switch 102 is performed (as shown in fig. 3), if the grounding disconnecting link of the neutral point 1020 of the main transformer No. 2 is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the grounding disconnecting link of the neutral point 1020 of the main transformer No. 2 is in the off position, and the operation is prohibited;
(2) when the wiring mode of the substation is an internal bridge wiring mode (as shown in fig. 4), the five-prevention design method is divided into the following 3 cases:
1) when the 103 switches are switched on/off (as shown in fig. 5), if the 100 switches are in the on position, the loop closing operation is performed, the five-prevention check does not need to judge whether the neutral point grounding disconnecting link of the No. 1 main transformer is switched on, if the 100 switches are in the off position, the five-prevention check needs to judge whether the neutral point grounding disconnecting link of the No. 1 main transformer is switched on, if the neutral point 1010 grounding disconnecting link of the No. 1 main transformer is in the on position, the five-prevention check passes, the operation can be continued, otherwise, the five-prevention check fails, and the neutral point 1010 grounding disconnecting link of the No. 1 main transformer is prompted to be in the off position, and the;
2) when the switch is switched on/off 104 (as shown in fig. 6), if the switch 100 is in the on position, the loop closing operation is performed, the five-prevention check does not need to judge whether the neutral point grounding knife switch of the main transformer No. 2 is on, if the switch 100 is in the off position, the five-prevention check needs to judge whether the neutral point grounding knife switch of the main transformer No. 2 is on, if the neutral point 1010 grounding knife switch of the main transformer No. 2 is in the on position, the five-prevention check passes, the operation can be continued, otherwise, the five-prevention check fails, and the grounding knife switch 110kV neutral point 1020 of the main transformer No. 2 is in the off position to prohibit the operation;
3) when 100 switches are switched on/off (as shown in fig. 7), if the switches 103 and 104 are switched on, the loop closing operation is performed, the five-prevention check does not need to judge the position of the main transformer neutral point grounding knife switch, if the switch 103 is switched on and the switch 104 is switched off, the five-prevention check needs to judge whether the No. 2 main transformer neutral point is switched on, if the No. 2 main transformer neutral point 1010 grounding knife switch is switched on, the five-prevention check passes, the operation can be continued, otherwise, the five-prevention check fails, and the operation is prohibited when the No. 2 main transformer neutral point 1020 grounding knife switch is switched off; if the switch 104 is switched on and the switch 103 is switched off, the five-prevention check needs to judge whether the neutral point of the No. 1 main transformer is switched on, if the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched on, the five-prevention check is passed and the operation can be continued, otherwise, the five-prevention check fails, and the operation is forbidden when the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched off.
Claims (1)
1. A transformer anti-misoperation topology five-prevention design method based on a dispatching automation system is characterized by comprising the following steps: before the transformer is powered on and off, if the neutral point grounding knife switch of the transformer is in the closing position, the five-prevention check is passed, the switch switching-on and switching-off operation is allowed, otherwise, the five-prevention check fails, the neutral point grounding knife of the transformer is prompted to be in the opening position, and the five-prevention check is not passed; the method specifically comprises the following steps:
(1) when the wiring mode of the transformer substation is a wiring mode that a switch is arranged on the high-voltage side of a transformer:
when the switch 101 is switched on and switched off, if the neutral point 1010 grounding disconnecting link of the No. 1 main transformer is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the grounding disconnecting link of the neutral point 1010 of the No. 1 main transformer is prompted to be in the off position, and the operation is forbidden; similarly, when the switch 102 is switched on and switched off, if the neutral point 1020 of the No. 2 main transformer is in the on position, the five-prevention check is passed, and the operation can be continued, otherwise, the five-prevention check fails, and the neutral point 1020 of the No. 2 main transformer is in the off position and the operation is forbidden;
(2) when the wiring mode of the transformer substation is an internal bridge wiring mode, the five-prevention design method is divided into the following 3 conditions:
1) when the switch is switched on/off 103, if the switch 100 is in the on position, the loop closing operation is performed, the five-prevention check does not need to judge whether the neutral point grounding disconnecting link of the main transformer No. 1 is on, if the switch 100 is in the off position, the five-prevention check needs to judge whether the neutral point grounding disconnecting link of the main transformer No. 1 is on, if the neutral point 1010 grounding disconnecting link of the main transformer No. 1 is in the on position, the five-prevention check passes, the operation can be continued, otherwise, the five-prevention check fails, and the neutral point 1010 grounding disconnecting link of the main transformer No. 1 is prompted to be in the off position, and the operation is forbidden;
2) when the switch is switched on/off 104, if the switch 100 is in the on position, the operation is closed loop operation, five-prevention verification does not need to judge whether the neutral point grounding disconnecting link of the No. 2 main transformer is switched on, if the switch 100 is in the off position, the five-prevention verification needs to judge whether the neutral point grounding link of the No. 2 main transformer is switched on, if the neutral point 1010 grounding disconnecting link of the No. 2 main transformer is in the on position, the five-prevention verification passes, the operation can be continued, otherwise, the five-prevention verification fails, and the grounding disconnecting link of the No. 2 main transformer 110kV neutral point 1020 is prompted to be in the off position, and the operation is forbidden;
3) when 100 switches are switched on/off, if the switches 103 and 104 are switched on, the operation is closed loop operation, five-prevention verification does not need to judge the position of the neutral point grounding disconnecting link of the main transformer, if the switch 103 is switched on and the switch 104 is switched off, the five-prevention verification needs to judge whether the neutral point of the No. 2 main transformer is switched on, if the neutral point 1010 grounding disconnecting link of the No. 2 main transformer is switched on, the five-prevention verification passes, the operation can be continued, otherwise, the five-prevention verification fails, and the grounding disconnecting link 1020 of the No. 2 main transformer is switched off and the operation is forbidden; if the switch 104 is switched on and the switch 103 is switched off, the five-prevention check needs to judge whether the neutral point of the No. 1 main transformer is switched on, if the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched on, the five-prevention check is passed and the operation can be continued, otherwise, the five-prevention check fails, and the operation is forbidden when the neutral point 1010 grounding disconnecting switch of the No. 1 main transformer is switched off.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112821446A (en) * | 2020-12-31 | 2021-05-18 | 广东电网有限责任公司 | Control method and device for neutral grounding knife of main transformer |
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