CN1243348A - Microcomputer type protection method for double-bus system when out of order - Google Patents
Microcomputer type protection method for double-bus system when out of order Download PDFInfo
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- CN1243348A CN1243348A CN 98116830 CN98116830A CN1243348A CN 1243348 A CN1243348 A CN 1243348A CN 98116830 CN98116830 CN 98116830 CN 98116830 A CN98116830 A CN 98116830A CN 1243348 A CN1243348 A CN 1243348A
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Abstract
The microcomputer type failure protection method for power systm is characterized by that according to the starting node position, the microcomputer can judge that which element is in failure, and according to the failure protection delay-action starting, is can judge that the bus coupler is delayed or the bus is delayed, both exceed rated value or not, combines bus running mode field, and judge that the bus coupler makes its exit or not, then according to the comparison of zero sequence, negative sequence and phase voltage with their individual rated values, determine that voltage action makes its exit or not, the bus coupler exits and the bus exits, which of them can meet voltage exit, which can be separated and tripped off. Said invention possesses bus mode automatic identification function, and makes the failure protection completely independent and is not dependent on the bus to make protection, so that it reduces the load of microcomputer bus protection, and can quickly and correctly eliminate failure, so that it possesses important economy and safety for power system.
Description
The present invention relates to a kind of guard method of electric power system, especially relate to a kind of microcomputer type protection method for double-bus system when out of order.
At voltage is in 110KV and above power plant, the electric substation, when transmission line, transformer or bus are short-circuited, when protective device action excision fault, may follow the circuit breaker miss operation of the element that breaks down.In addition, when short circuit occurs between the circuit breaker summation current transformer when dead band fault (also), though the relaying protection of this element can be with the circuit breaker tripping of this side, fault still can not be excised.Though utilize line backup protection can excise fault, enlarged excision extension on the one hand, prolonged fault clearing time on the other hand, its consequence is to cause electric power system to have a power failure on a large scale, even causes system break-down.
At present, the failure protection device that moves in the electric power system mostly is rectification type or integrated circuit type, so the ZDS-10 of relay limited company, ZDS-45 failure protection device and PMH type failure protection that bus differential protection is joined.More than device or be used for single line or does not have malfunctioning discriminating element, exists sensitivity low, and range of application is little, the shortcomings such as inconvenience of adjusting.
At above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of microcomputer type failure protection method, so that make failure protection can excise fault quickly and accurately, guarantee the economic security operation of electric power system.
In order to reach the foregoing invention purpose; the technical solution used in the present invention is: a kind of microcomputer type protection method for double-bus system when out of order; after certain element relaying protection tripping operation; send the startup node of an auxiliary contact and current relay contact series connection as failure protection by tripping relay to failure protection, this guard method comprises following step:
(1) judge that to be which circuit component has taken place malfunctioning, and the failure protection delayed startup;
(2) declare the bus time-delay and join time-delay with female, surpass set point if mother's connection is delayed time, and have bus running manner identification to determine mother's connection input simultaneously, then female connection exports; If the super set point of bus time-delay is then seen this element place bus that is determined by bus running manner identification, at which section bus, the outlet of which section bus;
(3) residual voltage on every section bus is read in sampling, negative sequence voltage and phase voltage, if that section bus satisfies following arbitrary condition: residual voltage greater than definite value, negative sequence voltage greater than definite value, phase voltage less than definite value, the then voltage of that section bus action, and voltage action outlet;
When (4) female connection outlet and voltage action outlet are satisfied simultaneously, jump female connection, when that section bus satisfies bus outlet and voltage action outlet simultaneously, jump that section bus.
It is that an auxiliary contact that is sent by tripping relay separately constitutes that above-mentioned failure protection starts node; after malfunctioning startup node started, microcomputer was by calculating the current value that malfunctioning element takes place, if current value is greater than failure protection current judgement definite value Idmin/K1*n1; failure protection delayed startup then
In the following formula, the minimum short circuit current the during short circuit of Idmin protection circuit end
K1: sensitivity coefficient, K1 〉=1.5
N1: current transformer ratio
From technique scheme as can be seen, the present invention has the following advantages: (1) can read in the tripping relay contact and the current relay contact of each element relaying protection with microcomputer, judge it is that breaker failure has taken place which circuit component according to contact position, can excise fault quickly and accurately, help the economic security operation of electric power system; (2) can carry out bus running manner and discern automatically, make failure protection independent fully, no longer rely on bus protection, alleviate the burden of bus protection; (3) have malfunctioning discriminating element, route protection can no longer be considered the calculating of electric current when malfunctioning; (4) introduce negative phase-sequence, zero sequence is after the low phase voltage differentiation measure; enough sensitivity is arranged when making the line end short circuit, and played the voltage blocking effect, prevented that operator on duty's mistake from bumping; accuracy of action has been guaranteed in the protection malfunction that the mistake energising causes, the loss of having avoided the protection malfunction to bring.
Below in conjunction with accompanying drawing the present invention is further explained and explanation:
Fig. 1 is the logic schematic diagram of method step of the present invention;
Fig. 2 is the logic schematic diagram of second method step of the present invention;
Fig. 3 is the double-bus configuration system schematic diagram.
Method shown in Figure 1 is used in the double bus power system of power plant, electric substation, " malfunctioning startup node " shown in the figure is several startups contact (starting contacts in order to say something with 9 of 9 element L1-L9 among this figure) of 1# element L1 to n# element Ln, and each starts the trip contact of tripping relay that contact is every circuit component and node is touched in the normally opened contact series connection of current relay.
Indication is the normally opened contact of the 9 secondary auxiliary contact of 1# element L1 to 9# element L9 in " isolation switch auxiliary node " square frame among Fig. 1.Because the operational mode of double-bus; often change; therefore the operation conditions that failure protection should be able to the dynamic tracking bus, this method utilizes isolation switch auxiliary contact and software to differentiate the automatic identification that realizes the double-bus operational mode, and the isolation switch auxiliary contact state of each element reads in by microcomputer.The operational mode of double-bus is shown with the operational mode word table, as shown in Figure 3, L1 is an element that is connected on the double-bus, 1G, 2G are the isolating switch of L1, microcomputer is by reading in the auxiliary contact state of isolating switch, promptly can the operational mode word operational mode of bus be expressed as follows (high level " 1 " expression switch closes, and low level " 0 " expression switch disconnects)
| Isolating switch | 1G | 2G | |
| The operational mode word | 0 | 0 | L1 stops |
| 1 | 0 | L1 is in the female operation of I | |
| 0 | 1 | L1 is in the female operation of II | |
| 1 | 1 | L1 is in the back brake process |
Said method is the existing method that generally adopts, though this method simple, intuitive, if the auxiliary contact contact is unreliable, the running status of element can not be represented in the operational mode word, thereby cause the protection malfunction.For this reason, this method is introduced the software automatic identifying method again, earlier according to auxiliary contact generation type word, when bus normally moves, according to Kirchhoff's law, all Connection Elements on two sections buses all satisfy Ij=0 promptly big poor be zero, at this moment, mother I, the female institute of II element also satisfies following formula, and promptly little difference separately is zero, under the back brake situation, or when helping a some loose contact, the I that Microcomputer Calculation goes out, the II mother is poor greatly still to be zero, and I, the female little difference of II then respectively has a unsymmetrical current, when microcomputer searches this situation, will be according to the I of isolating switch auxiliary contact state formation, the negate by turn one by one of the female operational mode word of II press the word bit order at every turn to wherein negate, calculates and judges whether two little differences are zero, up to searching two little differences is zero situation, obtains new operational mode word.
After the failure protection action, each circuit breaker on the tripping bus is therefore claimed very reliable, be the protection malfunction that the mistake that prevents the operator on duty is bumped, the mistake energising causes, introduced the voltage blocking measure in the method for the present invention.Among Fig. 1, microcomputer is the UA of each bus, UB, UC, UN voltage warp " voltage circuit ", read in by AC converter, sampling holder and intelligent A/D plate, handle, for bus protection, when bus is short-circuited, the voltage blocking element all has enough sensitivity, but when being used for failure protection, when other two voltage side of the end of lead line or transformer are short-circuited, the sensitivity of voltage blocking element should be satisfied the requirement of regulation, and at the terminal ground short circuit that takes place of lead line, the sensitivity coefficient of voltage blocking element is not less than 1.5; And when other two voltage side generation phase faults of lead line end or transformer, require the sensitivity coefficient of voltage blocking element to be not less than 1.3.
When making the line end short circuit, enough sensitivity is arranged, introduce negative phase-sequence, zero sequence, low-voltage criterion in the method for the present invention:
The low-voltage criterion is: U＜Uset
The residual voltage criterion is: U
0＞U
0Set
The negative sequence voltage criterion is: U
2＞U
2Set
Wherein Uset, U
0Set, U
2Set is respectively the definite value of low-voltage, residual voltage, negative sequence voltage.
Among Fig. 1 method of the present invention has been carried out more detailed statement.
After the malfunctioning startup node of certain element starts, read in by microcomputer by level conversion, it is malfunctioning that microcomputer is from the position judgment of malfunctioning startup node what element has taken place, then the failure protection delayed startup.After failure protection starts, declare bus time-delay and female connection time-delay, (T＞T if female connection is delayed time
1Set), and there is bus running manner to identify female connection input simultaneously, then female connection outlet; (T＞T if bus is delayed time
2Set), then see this element place bus that determines by bus running manner identification, if mother I, the female outlet of I, mother II, the female outlet of II.
Voltage circuit enters microcomputer by voltage sample, when the female voltage zero sequence of I greater than definite value (U
0＞U
0Set), negative phase-sequence is greater than definite value (U
2＞U
2Set), phase voltage is less than definite value (U
0＜U
0Set) arbitrary when satisfying, the female voltage action of I; When the female voltage zero sequence of II greater than definite value (U
0＞U
0Set), negative phase-sequence is greater than definite value (U
2＞U
2Set), phase voltage is less than definite value (U
0＜U
0Set) arbitrary when satisfying, the female voltage action of II.When arbitrary condition of moving female voltage action of I and the female voltage of II satisfies, voltage action outlet.
As can be seen from Figure 1, when mother joins outlet and voltage action outlet and satisfies simultaneously, jump female the connection; When female outlet of I and voltage action outlet are satisfied simultaneously, jump mother I; When female outlet of II and voltage action outlet are satisfied simultaneously, jump mother II.
Fig. 2 is an another embodiment of the invention." malfunctioning startup node " shown in the figure is several startups contact (9 with 9 element L1-L9 among this figure start the contact in order to say something) of 1# element L1 to n# element Ln, and each starts the contact is the trip contact of the tripping relay of every circuit component.
" isolation switch auxiliary node " among Fig. 2 and bus running manner word thereof determine and Fig. 1 in the same.
The same among " voltage circuit " square frame among Fig. 2 and voltage blocking method thereof and Fig. 1.
Because the startup contact of the failure protection of present embodiment is a secondary relaying protection trip contact purely, does not have sealing in of current relay contact, so present embodiment has been introduced the step that failure protection is differentiated again.The discriminating of failure protection is to utilize microcomputer that every phase current IA of each element, IB, IC are read in microsystem by level conversion, AC converter, sampling holder and the intelligent A/D plate of " current circuit ".Microcomputer adopts the phase current mode to protecting malfunctioning differentiation, differentiates according to following mode criterion whether breaker failure is arranged:
Idz＝Id·min/K1*n1
In the formula, Idzmin: the minimum short circuit current the during short circuit of protected circuit end
K1: sensitivity coefficient, K1 〉=1.5
N1: the no-load voltage ratio of current transformer.
Method shown in Figure 2; after the malfunctioning startup node of certain element starts; read in by microcomputer through level conversion; it is malfunctioning that microcomputer is from the position judgment of malfunctioning startup node what element has taken place; and calculate the current value of this element; if electric current is greater than failure protection current judgement definite value I＞Idz=Idmin/K1*n1, then failure protection delayed startup.Behind the failure protection delayed startup, declare bus time-delay and female connection time-delay, (T＞T if female connection is delayed time
1Set), and there is bus running manner identification to determine female connection input simultaneously, then female connection outlet; (T＞T if bus is delayed time
2Set), then see this element place bus that determines by bus running manner identification, if mother I, the female outlet of I, if mother II, the female outlet of II.
" voltage circuit " enters microcomputer by voltage sample, when the female voltage zero sequence of I greater than definite value (U
0＞U
0Set), negative phase-sequence is greater than definite value (U
2＞U
2Set), phase voltage is less than definite value (U
0＜U
0When set) arbitrary condition satisfies, the female voltage action of I; When the female voltage zero sequence of II greater than definite value (U
0＞U
0Set), negative phase-sequence is greater than definite value (U
2＞U
2Set), phase voltage is less than definite value (U
0＜U
0When set) arbitrary condition satisfies, the female voltage action of I.When arbitrary condition of moving female voltage action of I and the female voltage of II satisfies, voltage action outlet.
When mother joins outlet and voltage action outlet and satisfies simultaneously, jump female the connection; When female outlet of I and voltage action outlet are satisfied simultaneously, jump mother I, when female outlet of II and voltage action outlet are satisfied simultaneously, jump mother II.
Claims (2)
1, a kind of microcomputer type protection method for double-bus system when out of order; after certain element relaying protection tripping operation; send the startup node of an auxiliary contact and current relay contact series connection by tripping relay to failure protection, it is characterized in that this guard method comprises following step as failure protection:
(1) judge that to be which circuit component has taken place malfunctioning, and the failure protection delayed startup;
(2) declare the bus time-delay and join time-delay with female, surpass set point if mother's connection is delayed time, and have bus running manner identification to determine mother's connection input simultaneously, then female connection exports; The set point if bus is delayed time is then seen this element place bus that is determined by bus running manner identification, at which section bus, and the outlet of which section bus;
(3) residual voltage on every section bus is read in sampling, negative sequence voltage and phase voltage, if that section bus satisfies following arbitrary condition: residual voltage greater than definite value, negative sequence voltage greater than definite value, phase voltage less than definite value, the then voltage of that section bus action, and voltage action outlet;
When (4) female connection outlet and voltage action outlet are satisfied simultaneously, jump female connection, when that section bus satisfies bus outlet and voltage action outlet simultaneously, jump that section bus.
2, microcomputer type failure protection method according to claim 1; what it is characterized in that described failure protection is that an auxiliary contact that is sent by tripping relay separately constitutes with starting node; after malfunctioning startup node starts; microcomputer is by calculating the current value that malfunctioning element takes place; if current value is greater than failure protection current judgement definite value Idmin/K1*n1; failure protection delayed startup then
In the following formula, the minimum short circuit current the during short circuit of Idmin protection circuit end
K1: sensitivity coefficient, K1 〉=1.5
N1: current transformer ratio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98116830A CN1076133C (en) | 1998-07-28 | 1998-07-28 | Microcomputer type protection method for double-bus system when out of order |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98116830A CN1076133C (en) | 1998-07-28 | 1998-07-28 | Microcomputer type protection method for double-bus system when out of order |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1243348A true CN1243348A (en) | 2000-02-02 |
| CN1076133C CN1076133C (en) | 2001-12-12 |
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ID=5225234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98116830A Expired - Fee Related CN1076133C (en) | 1998-07-28 | 1998-07-28 | Microcomputer type protection method for double-bus system when out of order |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1076133C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384044C (en) * | 2005-07-20 | 2008-04-23 | 北京四方继保自动化股份有限公司 | Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current |
| CN101630836B (en) * | 2009-08-12 | 2011-12-28 | 国电南京自动化股份有限公司 | Correcting method of running mode of bus protection branch in double-bus connecting wire |
| CN103346496A (en) * | 2013-07-03 | 2013-10-09 | 中国电力工程顾问集团东北电力设计院 | Double-bus protection uninterrupted power transition method in transformer substation intellectualized reconstruction process |
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104977452A (en) * | 2014-12-22 | 2015-10-14 | 中国南方电网有限责任公司 | Failure protection mutual inductor tail current detection method |
| CN111641193A (en) * | 2020-05-19 | 2020-09-08 | 国网河南省电力公司电力科学研究院 | Self-adaptive double-bus failure protection method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149775A (en) * | 1995-11-04 | 1997-05-14 | 朱承麟 | Common comparison phase bus-bar protector for power plant and power system |
-
1998
- 1998-07-28 CN CN98116830A patent/CN1076133C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384044C (en) * | 2005-07-20 | 2008-04-23 | 北京四方继保自动化股份有限公司 | Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current |
| CN101630836B (en) * | 2009-08-12 | 2011-12-28 | 国电南京自动化股份有限公司 | Correcting method of running mode of bus protection branch in double-bus connecting wire |
| CN103346496A (en) * | 2013-07-03 | 2013-10-09 | 中国电力工程顾问集团东北电力设计院 | Double-bus protection uninterrupted power transition method in transformer substation intellectualized reconstruction process |
| CN103346496B (en) * | 2013-07-03 | 2016-04-06 | 中国电力工程顾问集团东北电力设计院有限公司 | Intelligent substationization transformation double-bus protects the transition method that do not have a power failure |
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104009449B (en) * | 2014-05-13 | 2017-05-03 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104977452A (en) * | 2014-12-22 | 2015-10-14 | 中国南方电网有限责任公司 | Failure protection mutual inductor tail current detection method |
| CN111641193A (en) * | 2020-05-19 | 2020-09-08 | 国网河南省电力公司电力科学研究院 | Self-adaptive double-bus failure protection method and device |
| CN111641193B (en) * | 2020-05-19 | 2022-08-19 | 国网河南省电力公司电力科学研究院 | Self-adaptive double-bus failure protection method and device |
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| Publication number | Publication date |
|---|---|
| CN1076133C (en) | 2001-12-12 |
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