CN101677183A - Self-adaptive master-slave positioning method for three-terminal differential protection - Google Patents
Self-adaptive master-slave positioning method for three-terminal differential protection Download PDFInfo
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Abstract
The invention discloses a self-adaptive master-slave positioning method for three-terminal differential protection and relates to the method for self-adaptive determination of a reference terminal andsynchronization terminals, which is applicable to the three-terminal longitudinal differential protection of a T-connection line and belongs to the relay protection of a high-voltage power grid in the field of electricity. The core of the method is to realize the self-adaptive determination of a master side and a slave side according to the size of codes of devices of various sides (utilizing anoptical fiber channel for determining the accuracy of the codes of the various sides), the running way (three-terminal running or two-terminal running) and working condition of the optical fiber channel (whether the disconnection of the channel occurs or not). The method sets three states: a master state (reference terminal), a slave 1 state (synchronization terminal 1), a slave 2 state (synchronization terminal 2) and a self-loop state (for testing), the device does not need field staff for intervention before and after the testing, and the state of the device is adjusted in a self-adaptive manner.
Description
Technical field
The present invention relates to electricity field, relate in particular at the master-slave positioning method of high-voltage fence T link three-terminal differential protection before adjusting synchronously.
Background technology
Line Current Differential Protection is based on Kirchhoff's current law (KCL), and the amplitude of utilization comparison protected circuit two ends electric current and the method for phase place constitute.Two ends electric current homophase during troubles inside the sample space ideally, the both sides electric current is anti-phase during external area error, and protection has very high sensitivity.
Because the principle of three end differential current relaying protections is the phase place of the electric current of each side of comparison ultra-high-tension power transmission line, be the correctness that guarantees that the circuit three-terminal differential protection calculates, must guarantee the sampling instant unanimity of the three end magnitudes of current that calculate.In fact,, add the time delay that an end sampled data is sent to the other end, can't guarantee the sampling instant unanimity of the three end magnitudes of current that calculate because three side protective devices power on constantly different and sampling crystal oscillator deviation.For making the sampling instant unanimity of the three end magnitudes of current that calculate, needing the sampling instant of setting one end is reference data, and the two ends basis of reference is adjusted the sampling instant of oneself in addition, and the process with sampling instant adjustment unanimity is called synchronous adjustment like this.
As shown in Figure 1, before adjusting synchronously, determine that an end is reference edge (master), in addition two ends be end 1 (from side 1) and hold 2 (from sides 2) synchronously synchronously, to synchronous end 1, hold 2 to adjust synchronously.General method is that force to set a certain side by hardware (or software) be reference edge, and opposite side be to hold synchronously.The pressure establishing method that adopts is as follows at present:
1) adopts hard pressing plate or bouncing pilotage.
Hard pressing plate or bouncing pilotage input are reference edge (main end), withdraw to holding (from end) synchronously.Adopt hard pressing plate, the hard pressing plate throwing of three side line road protection screens is moved back inconsistent, must a side be the pressing plate input, and both sides are for withdrawing from addition; Adopt bouncing pilotage, line protective devices inner bouncing pilotage in both sides is provided with inconsistent, must a side bouncing pilotage be ON, and a side bouncing pilotage is OFF; Adopt hard pressing plate or bouncing pilotage to depend on opening that protection reads into the amount state, if open damage or contact into the amount loop unreliable, the normal operation of influence protection; When the protective device checking experiment, needing by hard pressing plate or bouncing pilotage are set be that reference edge (main end) is done single-ended test, and test finishes and changes hard pressing plate or bouncing pilotage puts into operation, trystate with put into operation inconsistent, cause easily to be provided with inconsistently, do not meet operation custom; Know when operating management department takes any side be main, any side for from, be inconvenient to give operational management.
2) adopt soft pressing plate or control word.
Soft pressing plate or control word input are reference edge (main end), withdraw to holding (from end) synchronously.Soft pressing plate in both sides or control word difference, when the protective device checking experiment, needing by soft pressing plate or control word are set be that reference edge (main end) is done single-ended test, and test finishes and changes soft pressing plate or control word puts into operation, trystate with put into operation inconsistent, cause easily be provided with inconsistent; Also to administrative department's profit of making troubles.
Summary of the invention
At the deficiency of above method, the objective of the invention is to according to the intrinsic identification optical-fibre channel of differential protection whether each side device code, operational mode of series-parallel connection (operation of three ends, two ends operation, from ring status), optical-fibre channel the adaptively selected master of operating mode (reference side), from side (synchronous side).Make the field operator no longer close the state of center device, nor need the scene to adjust, be completely free of the influence of human factor guard mode.
To achieve the above object of the invention; technical scheme of the present invention is: a kind of self-adaptive master-slave positioning method of three end longitudinal differential protections of the T of being applicable to link; it is characterized by and need not the user and participate in adjusting of master and slave side, according to the adaptively selected master of operating mode (reference side) of each side device code (this side device code definite value, A channel offside device code definite value, B passage offside device code definite value) of differential protection identification passage series-parallel connection, operational mode (three end modes, two ends mode), optical-fibre channel, from side (synchronous side).
A. the side that each side device code maximum is just often adopted in the transmitting-receiving of (three end passages all drop into) three side optical fibers passages under the three end operational modes is as reference edge (master), and both sides are from side in addition.
B. select that to be connected a normal end with other both sides optical-fibre channel be reference edge for use in the transmitting-receiving of (three end passages all drop into) arbitrary optical-fibre channel is interrupted under the three end operational modes situation following time, both sides are from side in addition.
When c. three end modes transferred the two ends mode to, according to put into operation the both sides device code size of passage of two ends mode, a side of line coding maximum was as reference edge (master), and opposite side is from side.
D. receive that the offside device code equates with A channel offside device code definite value or equate with B passage offside device code definite value and install when the ring test pressing plate drops at passage, confirm as, do not change original master and slave side state from ring status.After finishing, ring test carries out master and slave side location again.
Described three end longitudinal differential self-adaptive master-slave positioning methods are to utilize optical-fibre channel to receive the correctness of each side device device code of validation of information, and relatively the size of each side device code is when normally not confirming master and slave side in conjunction with operational mode, passage.
Described three end longitudinal differential self-adaptive master-slave positioning methods are to utilize the self check of optical-fibre channel to confirm the operating mode of three end optical-fibre channels, under the situation of confirming only to have a side optical fibers channel mode to interrupt, adopt right 1 described b principle to determine master and slave side.
Described three end longitudinal differential self-adaptive master-slave positioning methods are to utilize A channel to throw to move back pressing plate, B passage to throw to move back pressing plate to confirm operational mode (operation of three ends, two ends operation), and the size of adaptively selected comparison three side device codes or two ends device code is determined master and slave side.
Described three end longitudinal differential self-adaptive master-slave positioning methods are the device codes and the comparison of offside device code definite value that utilize optical-fibre channel to receive, if phase Deng and from the ring-shaped pressuring plate input confirms as from ring status, keep original master and slave side constant.After finishing, ring test carries out master and slave side location again.
The present invention utilizes information, the pressing plate state of optical-fibre channel exchange, discerns various states, thereby reaches adaptively selected master, from the logic of side.
Description of drawings
Fig. 1 is a three-terminal line current differential protection schematic diagram;
Fig. 2 is that three ends change the two ends system schematic;
Fig. 3 is that the principal and subordinate locatees the adjustment schematic diagram.
Embodiment
1. channel transfer information
Protective device is ripple 24 points of sampling weekly; each sampling interval and offside device are by the optical-fibre channel exchange message, and the main contents of channel transfer comprise frame head; length; this side sampling sequence number; the offside sampling sequence number; synchronizing information; the sampled value of three-phase current; this side device code; the offside device code; the TA no-load voltage ratio; major state; from state; the principal and subordinate has decided state; A channel is unusual; the B channel abnormal; sendaisle number; receive path number; protection and passage input; start mark; mark synchronously; jump the position; teletransmission 1; teletransmission 2; the far away jumping; close a floodgate; change in voltage; the offside device is unusual; differential action; channel errors; CRC; end mark.
2. each side device code
Be provided with this side device code definite value, A channel offside device code definite value, B passage offside dress value coding definite value definite value in the device, be mainly used in the whether series-parallel connection of identification optical-fibre channel.
When adjusting, follow following principle (suppose that as shown in Figure 1 the A channel of M side device links to each other with the A channel of N side device, the B passage of M side device links to each other with the A channel of S side device, and the B passage of N side device links to each other with the B passage of S side device):
A) in the same device, this side line road coding definite value can not be identical with A channel offside line coding or B passage offside line coding definite value.
B) coding definite value in this side line road of M side device is the same with the A channel offside line coding definite value of the A channel offside line coding definite value of N side device and S side device.
C) coding definite value in this side line road of N side device is the same with the B passage offside line coding definite value of the A channel offside line coding definite value of M side device and S side device.
D) coding definite value in this side line road of S side device is the same with the B passage offside line coding definite value of the B passage offside line coding definite value of M side device and N side device.
E) arbitrary integer value of device code definite value scope 0-65535
For example: M side, N side, S side device line coding definite value example:
M side: this side line road coding: 1111; A channel offside line coding: 2222; B passage offside line coding: 3333.
N side: this side line road coding: 2222; A channel offside line coding: 1111; B passage offside line coding: 3333.
S side: this side line road coding: 3333; A channel offside line coding: 1111; B passage offside line coding: 2222.
Device code and offside device code definite value that protective device just often relatively receives, recognition device from ring, inconsistent from ring status and pressing plate, install state such as series-parallel connection.
● if this side device code and receiving system coding is identical, and the A channel coding that the offside device code adjusted of the offside that receives and this side are adjusted is identical, if having from ring-shaped pressuring plate then the set passage from encircling; Otherwise if the loop free pressing plate is then reported from ring status and pressing plate inconsistent.
● if the offside device code is encoded different with receiving system then is identified as the device series-parallel connection.
3. operation of three ends and two ends operation
When the differential control word of differential soft pressing plate, differential hard pressing plate, this passage dropped into, this passage dropped into.Have only a passage input in this side, the offside device that links to each other with the passage of this side input also has only this passage input, and this kind mode is two ends; All the other modes are three ends.For example: two passages of this side all drop into, and the offside device that links to each other with this side also is that two passages all drop into, and then are three end states; All withdraw from as two passages of this side, and the offside device that links to each other with this side also being that two passages all withdraw from, then also is three end states.When being in the both-end state, device only detects dropped channel.
For three end systems, after following situation can be converted into the operation of two end systems, transfer two side systems to, the protection operation equation was constant, just the 3rd end magnitude of current zero setting:
1. employing at a specified future date " T " connects mode, is the two ends operations at present.
2. normally be three ends, end protection maintenance becomes the both-end operation.
3. according to system's service requirement, an end switch disconnects.
For preceding two kinds of situations, the A that can link to each other with apparatus for examination and repair by two table apparatus that withdraw from still in operation or the differential protection pressing plate or the channel control word of B passage realize switching.As shown in Figure 2.
For the 3rd kind of situation, need not any processing, protective device can continue operation.
4. self-adaptive master-slave positioning method
● the principal and subordinate location during channel abnormal
When a channel abnormal, it is that two equal normal side of passage are master that the principal and subordinate locatees basic principle, and it is from side that a channel abnormal side is arranged.Therefore, when two optical-fibre channels between the side device are unusual, need not adjust the principal and subordinate location.When master and arbitrary optical-fibre channel between the side device are unusual, need carry out the principal and subordinate location again, with two optical-fibre channels of A, B all normally device be decided to be master, other two devices are decided to be from side.As shown in Figure 3.
● the operation of three ends
The side that each side device code maximum is just often adopted in the transmitting-receiving of (three end passages all drop into) three side optical fibers passages under the three end operational modes is as reference edge (master), and both sides are from side in addition.
● the two ends operation
When three end modes transferred the two ends mode to, according to put into operation the both sides device code size of passage of two ends mode, a side of line coding maximum was as reference edge (master), and opposite side is from side.
● passage is from ring
Receive that the offside device code equates with A channel offside device code definite value or equate with B passage offside device code definite value and install when the ring test pressing plate drops at passage, confirm as, do not change original master and slave side state from ring status.After finishing, ring test carries out master and slave side location again.
Claims (5)
1, a kind of self-adaptive master-slave positioning method of three-terminal differential protection, it is characterized by and need not the user and participate in adjusting of master and slave side, according to each side device code (this side device code definite value, A channel offside device code definite value, B passage offside device code definite value) of differential protection identification passage series-parallel connection,, the adaptively selected master of operating mode (reference side) of operational mode (three end modes, two ends mode), optical-fibre channel, from side (synchronous side);
A. the side that each side device code maximum is just often adopted in the transmitting-receiving of (three end passages all drop into) three side optical fibers passages under the three end operational modes is as reference edge (master), and both sides are from side in addition;
B. select that to be connected a normal end with other both sides optical-fibre channel be reference edge for use in the transmitting-receiving of (three end passages all drop into) arbitrary optical-fibre channel is interrupted under the three end operational modes situation following time, both sides are from side in addition;
When c. three end modes transferred the two ends mode to, according to put into operation the both sides device code size of passage of two ends mode, a side of line coding maximum was as reference edge (master), and opposite side is from side;
D. receive that the offside device code equates with A channel offside device code definite value or equate with B passage offside device code definite value and install when the ring test pressing plate drops at passage, confirm as, do not change original master and slave side state from ring status.After finishing, ring test carries out master and slave side location again.
2, the self-adaptive master-slave positioning method of three-terminal differential protection according to claim 1; it is characterized in that: be to utilize optical-fibre channel to receive the correctness of each side device device code of validation of information, relatively the size of each side device code is when normally not confirming master and slave side in conjunction with operational mode, passage.
3, the self-adaptive master-slave positioning method of three-terminal differential protection according to claim 1; it is characterized in that: be to utilize the self check of optical-fibre channel to confirm the operating mode of three end optical-fibre channels; confirming only to have under the situation of side optical fibers channel mode interruption, adopting right 1 described b principle to determine master and slave side.
4, the self-adaptive master-slave positioning method of three-terminal differential protection according to claim 1; it is characterized in that: be to utilize A channel to throw to move back pressing plate, B passage to throw to move back pressing plate to confirm operational mode (operation of three ends, two ends operation), the size of adaptively selected comparison three side device codes or two ends device code is determined master and slave side.
5, the self-adaptive master-slave positioning method of three-terminal differential protection according to claim 1; it is characterized in that: be that device code and the offside device code definite value of utilizing optical-fibre channel to receive compares; if phase Deng and from the ring-shaped pressuring plate input confirms as from ring status, keep original master and slave side constant.After finishing, ring test carries out master and slave side location again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101413824A CN101677183B (en) | 2008-09-16 | 2008-09-16 | Self-adaptive master-slave positioning method for three-terminal differential protection |
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| CN2008101413824A CN101677183B (en) | 2008-09-16 | 2008-09-16 | Self-adaptive master-slave positioning method for three-terminal differential protection |
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| CN101677183B CN101677183B (en) | 2012-01-11 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102118023A (en) * | 2011-03-01 | 2011-07-06 | 许继集团有限公司 | Asymmetric identification method of fiber channel for three-terminal differential protection of T connection line |
| CN103151762A (en) * | 2012-07-10 | 2013-06-12 | 南京南瑞继保电气有限公司 | Differential protection method of non-power-cut line replacing operation of by-pass switch |
| CN105896489A (en) * | 2016-05-11 | 2016-08-24 | 许继集团有限公司 | Differential protection method and system for multi-end T connected transmission line |
| CN106602525A (en) * | 2016-11-17 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | Differential protection system and method for power distribution network |
| CN104242261B (en) * | 2014-08-27 | 2017-05-31 | 国家电网公司 | It is a kind of to throw the control method moved back suitable for T connection electric transmission lines differential protection function |
| CN107782989A (en) * | 2016-08-26 | 2018-03-09 | 上海宝冶集团有限公司 | The quick joint debugging method of testing of end optical difference protection passage of circuit three |
| CN116995625A (en) * | 2023-08-08 | 2023-11-03 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
| CN117458411A (en) * | 2023-12-26 | 2024-01-26 | 四川迪思源科技有限公司 | Distribution network protection self-adaptive system under power system |
Family Cites Families (1)
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| CN101262130A (en) * | 2008-04-15 | 2008-09-10 | 烟台东方电子信息产业股份有限公司 | Three-end line optical differential synchronous phase algorithm based on sampling circle |
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- 2008-09-16 CN CN2008101413824A patent/CN101677183B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102118023A (en) * | 2011-03-01 | 2011-07-06 | 许继集团有限公司 | Asymmetric identification method of fiber channel for three-terminal differential protection of T connection line |
| CN103151762A (en) * | 2012-07-10 | 2013-06-12 | 南京南瑞继保电气有限公司 | Differential protection method of non-power-cut line replacing operation of by-pass switch |
| CN104242261B (en) * | 2014-08-27 | 2017-05-31 | 国家电网公司 | It is a kind of to throw the control method moved back suitable for T connection electric transmission lines differential protection function |
| CN105896489B (en) * | 2016-05-11 | 2019-05-14 | 许继集团有限公司 | A kind of multiterminal T connection electric transmission line differential protecting method and system |
| CN105896489A (en) * | 2016-05-11 | 2016-08-24 | 许继集团有限公司 | Differential protection method and system for multi-end T connected transmission line |
| CN107782989B (en) * | 2016-08-26 | 2020-03-06 | 上海宝冶集团有限公司 | Rapid joint debugging test method for three-terminal optical difference protection channel of line |
| CN107782989A (en) * | 2016-08-26 | 2018-03-09 | 上海宝冶集团有限公司 | The quick joint debugging method of testing of end optical difference protection passage of circuit three |
| CN106602525B (en) * | 2016-11-17 | 2018-12-07 | 云南电网有限责任公司电力科学研究院 | Power distribution network differential protective system and method |
| CN106602525A (en) * | 2016-11-17 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | Differential protection system and method for power distribution network |
| CN116995625A (en) * | 2023-08-08 | 2023-11-03 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
| CN116995625B (en) * | 2023-08-08 | 2024-01-30 | 国网重庆市电力公司 | Power distribution network differential protection method and system based on regional ad hoc network communication |
| CN117458411A (en) * | 2023-12-26 | 2024-01-26 | 四川迪思源科技有限公司 | Distribution network protection self-adaptive system under power system |
| CN117458411B (en) * | 2023-12-26 | 2024-03-12 | 四川迪思源科技有限公司 | Distribution network protection self-adaptive system under power system |
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