CN102882192B - Technical method for relay protection of ''logic identification point protection group of 0 and 1 statuses'' of an electrical substation - Google Patents
Technical method for relay protection of ''logic identification point protection group of 0 and 1 statuses'' of an electrical substation Download PDFInfo
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- CN102882192B CN102882192B CN201210226181.0A CN201210226181A CN102882192B CN 102882192 B CN102882192 B CN 102882192B CN 201210226181 A CN201210226181 A CN 201210226181A CN 102882192 B CN102882192 B CN 102882192B
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Abstract
The invention discloses a technical method for relay protection of ''logic identification point protection group of 0 and 1 statuses'' of an electrical substation. The technical method sends ''status response'' values of inlet ends and outlet ends of all protected objectives to a central controller, and achieves sharing status information of the protected objectives: the ''status response'' values of the inlet ends and the outlet ends are ''1'' and ''0'' in case of a short circuit occurs in any one of the protected objectives, thereby implementing main relay protection on the protected objectives. When the main relay protection is in fault, an extended ''1'' and ''0'' logic pair is formed through a nearest endpoint with two former ''status response'' values as ''1'', and a nearest short circuit extended area is found out, thereby implementing backup relay protection and cutting off power supplies to the protected objectives. According to the method, a relay protection device of an electrical substation is simple and efficient; and high safety and high reliability of a power supply system are better guaranteed.
Description
Technical field
The present invention relates to electricity substation " 0,1 state logic identification point protection group " Protection Technology.
Background technology
The existing Protection Technology method of electricity substation, its circuit, bus, tranformer protection adopt different principle, each other not exchange message.Bus and tranformer protection are subject to CT (current transformer) saturated impact, need additionally arrange independently backup protection equipment; Route protection operation time limit is divided into 1,2,3 section of characteristic quick-action not enough.These are exactly the limitation of existing traditional relay protection technical system, the very crux of complicated, low usefulness.
Summary of the invention
Object of the present invention is just to provide electricity substation " 0,1 state logic identification point protection group " Protection Technology method, and this kind of method makes the protective relaying device of electricity substation simplify, efficiently, ensures the high safety reliability of electric power system better.
The present invention solves its technical problem, and the technical scheme adopted is: a kind of electricity substation " 0,1 state logic identification point protection group " Protection Technology method, the steps include:
The electric parameters entering, export two ends of A, the circuit gathering electricity substation, bus, transformer and protected object, sets up " state reflection " logical relation of its " 1 ", " 0 ";
The method for building up of " state reflection " logical relation of B, " 1 ", " 0 " is:
When the electric current in the electric parameters gathered is higher than current threshold, or when the impedance in the electric parameters gathered is lower than impedance threshold, then its " state reflection " is " 1 "; Otherwise " state reflection " is " 0 "; " state reflection " value of each protected object all send central controller process;
C, " the state reflection " that enter, export two ends when protected object are " 1 ", " 0 ", and central controller judges this protected object internal short circuit fault, sends main protection action command, realizes main relaying protection; When protected object enter, export two ends " state reflection " be " 1 ", " 1 ", central controller judges this protected object external short circuit fault below, does not send main protection action command; " the state reflection " that enter, export two ends when protected object is " 0 ", " 0 ", and central controller judges that this protected object normally runs, and does not send main protection action command;
D, judge protected object internal short circuit fault when central controller, action is failed in relaying protection as main in it, central controller is then found out " state reflection " " 1 " the most contiguous before this protected object entrance, be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault, backup relaying instruction is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes backup relaying; As backup relaying still akinesia; central controller is then found out " state reflection " " 1 " of time vicinity before this protected object entrance; be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault; the instruction of second time backup relaying is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes second time backup relaying.
Operation principle of the present invention is:
The present invention will gather and ' state reflection " value, all ' the state reflection differentiating that all protected objects such as the circuit of electricity substation, bus, transformer enter, export " value all send central controller, realizes sharing of protected object state information:
When arbitrary protected object internal short-circuit, it enters, the port of export ' state reflection " value is " 1 ", " 0 "; Namely according to this main relaying protection is implemented to protected object.
Due to must over-current phenomenon avoidance be also had before the entrance of internal short-circuit protected object, being arranged by appropriate threshold value, the reflection of plural state before it, must be there is " value is the end points of " 1 "; Equally, the reflection of plural state must also be there is after its port of export " value is the end points of " 0 ".Thus when main relaying protection is broken down; can by two states reflections before nearest " value be the end points of " 1 ", forms " 1 " " 0 " logic pair of expansion, and finds out nearest short circuit expansion area; enforcement backup relaying, cut off the power supply to object of protection.
Compared with the prior art, the beneficial effect of the technology of the present invention is:
Sharing one, by protected object state information, and without the need to additionally increasing checkout equipment and proterctive equipment can realize instantaneous main protection and one-level, secondary backup protection function.It improves, and the hardware cost of backup protection system is low, structure is simplified, efficiently, can ensure high safety, the reliability of electric power system better.
Two, simultaneously, the present invention changes a little, becomes at least to have occurred two " 1 " and two " 0 " in adjacent six end points, then judges to there occurs internal short circuit fault and trigger protection between middle two-end-point.When the Information Monitoring mistake of 1/3rd occurs, still can not affect the normal work of protection, do not expand the scope of power failure.
Three, existing front and back ends current differential detection method is large by the impact of CT saturation, error; As long as the present invention can determine whether be greater than threshold value to the detection of electric current, not by the impact of CT saturation, its testing result is accurate, and can detect fault point faster, and realizes instant action.
Four, the present invention can use side by side with existing resist technology device, thus changes the situation of national class one-level important power consumers requirement " different principle duplicate protection " long term deletion.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the circuit of an electricity substation forms schematic diagram.
Fig. 2 is the schematic diagram of the embodiment of the present invention for the electricity substation of Fig. 1.
Embodiment
Embodiment
A kind of embodiment of the present invention is: a kind of electricity substation " 0,1 state logic identification point protection group " Protection Technology method, the steps include:
The electric parameters entering, export two ends of A, the circuit gathering electricity substation, bus, transformer and protected object, sets up " state reflection " logical relation of its " 1 ", " 0 ";
The method for building up of " state reflection " logical relation of B, " 1 ", " 0 " is:
When the electric current in the electric parameters gathered is higher than current threshold, or when the impedance in the electric parameters gathered is lower than impedance threshold, then its " state reflection " is " 1 "; Otherwise " state reflection " is " 0 "; " state reflection " value of each protected object all send central controller process;
C, " the state reflection " that enter, export two ends when protected object are " 1 ", " 0 ", and central controller judges this protected object internal short circuit fault, sends main protection action command, realizes main relaying protection; When protected object enter, export two ends " state reflection " be " 1 ", " 1 ", central controller judges this protected object external short circuit fault below, does not send main protection action command; " the state reflection " that enter, export two ends when protected object is " 0 ", " 0 ", and central controller judges that this protected object normally runs, and does not send main protection action command;
D, judge protected object internal short circuit fault when central controller, action is failed in relaying protection as main in it, central controller is then found out " state reflection " " 1 " the most contiguous before this protected object entrance, be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault, backup relaying instruction is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes backup relaying; As backup relaying still akinesia; central controller is then found out " state reflection " " 1 " of time vicinity before this protected object entrance; be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault; the instruction of second time backup relaying is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes second time backup relaying.
Below provide, when the main transformer of an electricity substation breaks down, by the example method, it carried out to detailed process and the situation of relaying protection:
Fig. 1 is that the circuit of this electricity substation forms schematic diagram; Fig. 2 is the schematic diagram by the example method, this electricity substation being carried out to relaying protection.
Fig. 1, Fig. 2 illustrate, when main transformer generation internal short circuit fault in Fig. 1, relevant " state reflection " value that central controller receives is: entering, exporting two end points " state reflection " value 1., 2. of main transformer is " 1 ", " 0 "; Entering, exporting two end points " state reflection " value 3., 4. of high voltage bus before it is " 1 ", " 1 "; Thereafter entering, exporting two end points " state reflection " value 5., 6. of low-voltage bus bar is " 0 ", " 0 ".
Central controller is " 1 ", " 0 " according to entering, exporting two end points " state reflection " value 1., 2. of main transformer, judges this main transformer generation internal short circuit fault, sends main protection action command, realize main relaying protection; And the entering of high voltage bus before it, exporting two end points " state reflection " value 3., 4. for " 1 ", " 1 ", central controller judges to have after this high voltage bus external short circuit fault, does not send main protection action command; And the entering of its low-voltage bus bar below, exporting two end points " state reflection " value 5., 6. for " 0 ", " 0 ", central controller judges that this low-voltage bus bar is not short-circuited fault, does not send main protection action command.
If main relaying protection because of fault fail realize, then central controller is " 1 " according to the state value 4. of the high voltage bus port of export before main transformer, be " 0 " formation " 1 ", " 0 " logic pair with main transformer port of export state value 2., to this " 1 ", " 0 " logic to the region of correspondence (the high voltage bus port of export 4. and the main transformer port of export 2. between) send backup relaying instruction, realize backup relaying; As backup relaying still akinesia; the 1. time contiguous above high voltage bus arrival end " state reflection " " 1 " 3. of this main transformer arrival end then found out by central controller; be somebody's turn to do " state reflection " " 1 " and the main transformer port of export " state reflects " " 0 " formation " 1 ", " 0 " logic pair 2.; to this " 1 ", " 0 " logic to the region of correspondence (arrival end of high voltage bus 3. and the main transformer port of export 2. between) send the instruction of second time backup relaying, realize second time backup relaying.
Claims (1)
1. electricity substation " 0, a 1 state logic identification point protection group " Protection Technology method, the steps include:
The electric parameters entering, export two ends of A, the circuit gathering electricity substation, bus, transformer and protected object, sets up " state reflection " logical relation of its " 1 ", " 0 ";
The method for building up of " state reflection " logical relation of B, " 1 ", " 0 " is:
When the electric current in the electric parameters gathered is higher than current threshold, or when the impedance in the electric parameters gathered is lower than impedance threshold, then its " state reflection " is " 1 "; Otherwise " state reflection " is " 0 "; " state reflection " value of each protected object all send central controller process;
C, " the state reflection " that enter, export two ends when protected object are " 1 ", " 0 ", and central controller judges this protected object internal short circuit fault, sends main protection action command, realizes main relaying protection; When protected object enter, export two ends " state reflection " be " 1 ", " 1 ", central controller judges this protected object external short circuit fault below, does not send main protection action command; " the state reflection " that enter, export two ends when protected object is " 0 ", " 0 ", and central controller judges that this protected object normally runs, and does not send main protection action command;
D, judge protected object internal short circuit fault when central controller, action is failed in relaying protection as main in it, central controller is then found out " state reflection " " 1 " the most contiguous before this protected object entrance, be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault, backup relaying instruction is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes backup relaying; As backup relaying still akinesia; central controller is then found out " state reflection " " 1 " of time vicinity before this protected object entrance; be somebody's turn to do " state reflects " " 0 " formation " 1 ", " 0 " logic pair of the protected object port of export of " state reflection " " 1 " and internal short circuit fault; the instruction of second time backup relaying is sent to this " 1 ", the region of " 0 " logic to correspondence, realizes second time backup relaying.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1619912A (en) * | 2004-12-10 | 2005-05-25 | 西宁电力学校 | Electric power back up protection method |
| CN101409442A (en) * | 2008-11-25 | 2009-04-15 | 中国南方电网有限责任公司 | Rapid line backup protection method with reliable selection based on wide area measuring system |
| CN102185298A (en) * | 2011-05-11 | 2011-09-14 | 吴登庆 | Relay protection method for power supply circuit based on communication network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1619912A (en) * | 2004-12-10 | 2005-05-25 | 西宁电力学校 | Electric power back up protection method |
| CN101409442A (en) * | 2008-11-25 | 2009-04-15 | 中国南方电网有限责任公司 | Rapid line backup protection method with reliable selection based on wide area measuring system |
| CN102185298A (en) * | 2011-05-11 | 2011-09-14 | 吴登庆 | Relay protection method for power supply circuit based on communication network |
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