CN106451351B - A kind of station domain protecting method that logic-based judges - Google Patents
A kind of station domain protecting method that logic-based judges Download PDFInfo
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- CN106451351B CN106451351B CN201610284471.9A CN201610284471A CN106451351B CN 106451351 B CN106451351 B CN 106451351B CN 201610284471 A CN201610284471 A CN 201610284471A CN 106451351 B CN106451351 B CN 106451351B
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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
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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
-
- 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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Protect system and method in the station domain judged the invention belongs to Relay Protection Technology in Power System field more particularly to a kind of logic-based.It is characterized in that, the system comprises the connected data of sequence to read in module, logic judgment module and protection act module；Method includes gathered data；Using the substation secondary protective device action logic signal of acquisition fault message is obtained through logic judgment；According to fault message, trip signal is sent to corresponding breaker.The present invention effectively improves the back-up protection performance of element in station, solves that the stage back-up protection of tradition is difficult to coordinate and the problems such as action delay is long, the program is simple and reliable, it is easy to accomplish.
Description
Technical field
The invention belongs to the station domain protections that Relay Protection Technology in Power System field more particularly to a kind of logic-based judge
Method.
Background technology
Substation's traditional protection is only capable of obtaining local monospace or local message, and this geneogenous deficiency has resulted in protection
Selectivity, quick-action and sensitivity can not be taken into account simultaneously, and cannot meet the requirements at the higher level that complex electric network proposes protection further.
Meanwhile as computer, the communication technology are constantly progressive, obtain the protection of whole station information realization station domain and has become possibility, research station
It protects to ensureing that electric power netting safe running is of great significance in domain.
Currently, the protection of station domain mainly has centralized and distributed two kinds of algorithms.Centralized algorithm is to concentrate all information
To a computer system, information is focused on.Distributed algorithm is based on multi-Agent mainly for distributed busbar
Decentralized bus protection principle and structure, design the technical solution of specific implementation, improve the reliability of bus differential protecting
And sensitivity.
Invention content
To achieve the goals above, technical solution proposed by the present invention is a kind of station domain protection system that logic-based judges
System, which is characterized in that the system comprises data to read in module, logic judgment module is connected with protection act sequence of modules；
The data read in the logical signal that module is used to acquire substation secondary protective device, including tranformer protection dress
Answering for setting presses off lock signal, overcurrent protection signal, current direction signal, zero-sequencedirectional protection signal, zero-sequence current direction signal,
And high-pressure side, medium voltage side, the distance protection signal of low-voltage side outlet protective device, zero-sequence current direction signal, zero sequence overcurrent
Protection signal, and the data of acquisition are sent to logic judgment module；
The logic judgment module is used to press off lock signal, overcurrent protection signal, electricity according to answering for protection equipment for transformer
Flow direction signal, zero-sequencedirectional protection signal, zero-sequence current direction signal and high-pressure side, medium voltage side, low-voltage side outlet protection
Distance protection signal, zero-sequence current direction signal, the zero-sequencedirectional protection signal of device, it is high through tranformer protection logical AND, in,
Low-voltage bus bar relay protective scheme judges, obtains fault message, and fault message is sent to protection act module；
The protection act module is used for according to fault message, and trip signal is sent to corresponding breaker.
A kind of station domain protecting method that logic-based judges, which is characterized in that the method includes：
Step 1：Gathered data, including answering for protection equipment for transformer press off lock signal, overcurrent protection signal, current direction
Signal, zero-sequencedirectional protection signal, zero-sequence current direction signal and high-pressure side, medium voltage side, low-voltage side outlet protective device
Distance protection signal, zero-sequence current direction signal, zero-sequencedirectional protection signal；
Step 2：Carry out tranformer protection logical AND high-voltage side bus relay protective scheme, medium voltage side bus protection logic and low pressure
Side bus relay protective scheme judges, obtains fault message；
Step 3：According to fault message, trip signal is sent to corresponding breaker.
The tranformer protection logic includes tranformer protection logic based on zero-sequence current protection signal and based on multiple pressure
It is latched the tranformer protection logic of overcurrent protection signal, specific logic is：
In tranformer protection logic based on zero-sequence current protection signal, protected without the high-voltage side outlet wire zero-sequence current in direction
It protects III sections and starts without II sections of the high voltage side of transformer zero-sequence current protection in direction, or go out without the medium voltage side in direction
IIII sections of line zero-sequence current protection and start without II sections of the transformer medium voltage side zero-sequence current protection in direction, while transformer
High, medium voltage side zero-sequence current direction is not just, to be then determined as that earth fault occurs for transformer；
Based in the tranformer protection logic for pressing off lock overcurrent protection signal again, high voltage side of transformer presses off lock overcurrent and protects again
I section startups of shield, in transformer, low-pressure side press off lock signal again and open, while in transformer, low-pressure side directional over-current protection I
Duan Jun does not start, then judges that phase fault occurs for transformer.
The high-voltage side bus relay protective scheme include high-voltage side bus relay protective scheme based on zero-sequence current protection signal and
Based on the high-voltage side bus relay protective scheme for pressing off lock overcurrent protection signal again, specific logic is：
In high-voltage side bus relay protective scheme based on zero-sequence current protection signal, without the high voltage side of transformer zero sequence in direction
Current protection II starts, and high voltage side of transformer zero-sequence current direction is just, without the high-voltage side outlet wire zero-sequence current protection in direction
III sections of startups, high-voltage side outlet wire zero sequence direction are not just that I, II, III sections of high-voltage side outlet wire ground distance protection does not start,
Then judge that earth fault occurs for high-voltage side bus；
Based on press off again lock overcurrent protection signal high-voltage side bus relay protective scheme in, a high-pressure side at least outlet away from
Start from quadrilateral characteristics, I, II, III sections of the distance protection of all outlets does not start, and high voltage side of transformer presses off lock letter again
Number opening, while I sections of high voltage side of transformer directional over-current protection does not start, then judges that phase-to phase fault occurs for high-voltage side bus.
Medium pressure side bus relay protective scheme includes the medium voltage side bus protection logic sum based on zero-sequence current protection signal
Based on the medium voltage side bus protection logic for pressing off lock overcurrent protection signal again, specific logic is：
In medium voltage side bus protection logic based on zero-sequence current protection signal, transformer medium voltage side zero sequence direction signal is
Just, II sections of transformer medium voltage side zero-sequence current protection startup, medium voltage side circuit zero sequence direction signal and medium voltage side line-to-ground away from
Do not start from protection signal, while without the III sections of startups of the medium voltage side zero sequence current protection in direction, then judging medium voltage side
Earth fault occurs for busbar；
Based in the medium voltage side bus protection logic for pressing off lock overcurrent protection signal again, transformer medium voltage side presses off again to be locked
I sections of startups of stream protection, I, II, III sections of medium voltage side circuit distance protection do not start, and high voltage side of transformer presses off lock overcurrent and protects again
II sections of startups of shield, then judge that phase fault occurs for medium voltage side busbar.
The low-pressure side bus relay protective scheme includes being patrolled based on the low-pressure side bus protection for pressing off lock overcurrent protection signal again
Volume, specific logic is：
Step down side presses off I sections of startups of lock overcurrent protection again, and I, II, III sections of low-pressure side circuit overcurrent protection is
Do not start, high voltage side of transformer presses off II sections of startups of lock overcurrent protection again, then judges that phase fault occurs for low-pressure side bus.
Advantageous effect
The decision center of centralized station domain protection can obtain more information, from the level positioning failure of whole station, simplify
Matching relationship of the protection on actuation time, and can improve the selectivity and reliability of protection.Based on this, the present invention adopts
Take centralized solution, it is proposed that a kind of station domain protection system and method that logic-based judges.Domain host of standing receives substation
The action logic signal of interior each second protection equipment is sentenced by tranformer protection logical AND high, medium and low voltage bus protection logic
It is disconnected, fault message is obtained, and trip signal is sent to corresponding breaker.The standby that the invention effectively improves element in station is protected
Performance is protected, solves that the stage back-up protection of tradition is difficult to coordinate and the problems such as action delay is long, the program is simple and reliable, is easy to
It realizes.The present invention can not take into account selectivity, quick-action and sensitivity simultaneously for solving traditional transforming plant protecting, and further cannot
The problem of meeting the requirements at the higher level that complex electric network proposes protection.
Description of the drawings
Fig. 1 is the station domain protection system construction drawing that logic-based provided by the invention judges；
Fig. 2 is the tranformer protection logic chart based on zero-sequence current protection signal；
Fig. 3 is based on the tranformer protection logic chart for pressing off lock overcurrent protection signal again；
Fig. 4 is the high-voltage side bus relay protective scheme figure based on zero-sequence current protection signal；
Fig. 5 is based on the high-voltage side bus relay protective scheme figure for pressing off lock overcurrent protection signal again；
Fig. 6 is the medium voltage side bus protection logic chart based on zero-sequence current protection signal；
Fig. 7 is based on the medium voltage side bus protection logic chart for pressing off lock overcurrent protection signal again；
Fig. 8 is based on the low-pressure side bus relay protective scheme figure for pressing off lock overcurrent protection signal again；
Fig. 9 is that certain the station model built on RTDS does the model emulation figure of simulating, verifying.
Specific implementation mode
Below in conjunction with the accompanying drawings, it elaborates to preferred embodiment.
Embodiment 1
Fig. 1 is the station domain protection system construction drawing that logic-based provided by the invention judges, as shown in Figure 1, the present invention carries
The station domain protection system that the logic-based of confession judges includes that the connected data reading module of sequence, logic judgment module and protection are dynamic
Make module.
Logical signal of the data reading module for acquiring substation secondary protective device, including protection equipment for transformer
Lock signal, overcurrent protection signal, current direction signal, zero-sequencedirectional protection signal, zero-sequence current direction signal are pressed off again, and
High-pressure side, medium voltage side, the distance protection signal of low-voltage side outlet protective device, zero-sequence current direction signal, zero-sequencedirectional protection
Signal, and the data of acquisition are sent to logic judgment module；
Logic judgment module is used to press off lock signal, overcurrent protection signal, electric current side according to answering for protection equipment for transformer
To signal, zero-sequencedirectional protection signal, zero-sequence current direction signal and high-pressure side, medium voltage side, low-voltage side outlet protective device
Distance protection signal, zero-sequence current direction signal, zero-sequencedirectional protection signal, through tranformer protection logical AND high, medium and low voltage
Bus protection logic judgment obtains fault message, and fault message is sent to protection act module；
Protection act module is used for according to fault message, and trip signal is sent to corresponding breaker.
The operation principle of the single-phase earthing distance protection system provided by the invention compared based on voltage-phase is：
In Fig. 2 logics, when earth fault occurs for transformer, in II sections of high voltage side of transformer zero-sequence current protection and transformer
Press zero-sequence current protection II section of side at least can there are one startups, but since the two signal itself is without directional information, also not
It can judge that abort situation is on the transformer or on busbar or circuit.And transformer is high, medium voltage side zero-sequence current is adjusted
Positive direction is directed to outlet, if the two direction is not just, the possibility of busbar or line fault can be excluded, by failure at this time
Position restriction is on the transformer.Meanwhile plus zero sequence current protection III sections of high-pressure side and medium voltage side line in relay protective scheme
Zero-sequence current protection III sections of road entry condition, enhances the stringency of relay protective scheme, prevents high voltage side of transformer zero-sequence current from protecting
II sections of II sections of shield or transformer medium voltage side zero-sequence current protection cause relay protective scheme to be judged by accident because of the reasons error starting such as plant failure.
In Fig. 3 logics, when phase fault occurs for transformer, high voltage side of transformer presses off I sections of lock overcurrent protection again will
Start.And in transformer, the overcurrent protection positive direction of low-pressure side be directed toward busbar, if the side of transformer medium voltage side and low-pressure side at this time
Do not start to overcurrent protection, then in can excluding, the possibility of low-pressure side bus and line fault, judgement failure is happened at transformer
On.Meanwhile no matter in, low-pressure side whether have a plant-grid connection, in transformer, low-pressure side answer that press off lock signal be opening, lead to
It crosses and the two conditions is accessed into "AND" logic, can eliminate and only press off lock overcurrent protection enabling signal conduct again by high voltage side of transformer
The drawbacks of logic erroneous judgement, easily occurs for entry condition, enhances the reliability of relay protective scheme.
In Fig. 4 logics, due to high voltage side of transformer zero-sequence current protection positive direction and high-pressure side zero sequence current protection
Positive direction is directed to circuit, therefore only needs high voltage side of transformer zero sequence direction current start, and high-pressure side circuit zero sequence direction
It is not that just, while I, II, III section of circuit ground distance protection does not start that may recognize that ground connection occurs for high-voltage side bus former
Barrier.In relay protective scheme figure, by by high voltage side of transformer zero-sequence current direction signal and high voltage side of transformer zero-sequence current protection
II sections of enabling signal phase "AND" constitute zero-sequence current protection II sections of direction may and being not configured in protection in conventional stations and start letter
Number.High-voltage side outlet wire zero-sequence current protection is started into access "AND" logic for III sections, the reliability of relay protective scheme can be enhanced, prevented
Malfunction for tranformer protection causes logic to be judged by accident caused by protection equipment for transformer failure and other reasons.
In Fig. 5 logics, although relaying configuration has no the relaying configuration that positive direction is directed toward high-voltage side bus in conventional stations,
In I sections of conventional high-tension side line road distance protection, the small quadrangle protection feature being equipped with centered on complex plane origin can react
This signal can be uploaded to GOOSE network by high-voltage side bus phase-to phase fault.Since high-voltage side bus institute connecting lines are not all
It is connected to power supply, therefore requires nothing more than starting apart from quadrilateral characteristics at least circuit in logic.No matter whether circuit accesses
Power supply, I, II, III sections of distance protection will not start, and by the debugging of this condition possibility on the line occurs for logic.
Again by limiting transformer high-pressure side directional over-current protection I sections do not start, exclude the possibility that breaks down of transformer, finally will therefore
Barrier is located on high-voltage side bus.Since circuit distance protection and tranformer protection do not start under normal circumstances, if at this time certain
Apart from quadrilateral characteristics malfunction occurs for a route protection, then bus protection logic can be caused to judge by accident, therefore by transformer
High-pressure side presses off lock signal exploitation and protection "AND" logic is added again, improves the reliability of logic.
In Fig. 6 logics, II sections of transformer medium voltage side zero sequence direction signal and transformer medium voltage side zero-sequence current protection are opened
Dynamic signal phase "AND", constitutes direction zero-sequence current protection II segment signals (being not configured in traditional protection), the trip bar as logic
Part.Barring condition is constituted using medium voltage side circuit zero sequence direction signal and medium voltage side line-to-ground distance protection signal, by middle pressure
Side line road fault condition excludes.Enhance the faulty action preventing of logic using III sections of enabling signals of medium voltage side zero sequence current protection
Property.
In Fig. 7 logics, trip bar of the lock I sections of enabling signals of overcurrent protection as logic is pressed off again by transformer medium voltage side
Part.Do not started using I, II, III sections of medium voltage side circuit distance protection to exclude medium voltage side circuit phase fault situation.In order to drop
It is low to lead to the possibility that logic is judged by accident because of false protection, it presses off lock II sections of enabling signals of overcurrent protection again using high voltage side of transformer and comes
Entry condition in logic is verified.
In Fig. 8 logics, trip bar of the lock I sections of enabling signals of overcurrent protection as logic is pressed off again by step down side
Part.Do not started using the overcurrent protection of low-pressure side circuit to exclude low-pressure side circuit phase fault situation.Use high voltage side of transformer
Lock II sections of enabling signals of overcurrent protection are pressed off again to be verified to the entry condition in logic, enhance logic reliability.
According to above-mentioned principle, the single-phase earthing distance protecting method provided by the invention compared based on voltage-phase includes：
Step 1：Gathered data, including answering for protection equipment for transformer press off lock signal, overcurrent protection signal, current direction
Signal, zero-sequencedirectional protection signal, zero-sequence current direction signal and high-pressure side, medium voltage side, low-voltage side outlet protective device
Distance protection signal, zero-sequence current direction signal, zero-sequencedirectional protection signal；
Step 2：The high, medium and low bus protection logic judgment of tranformer protection logical AND is carried out, fault message is obtained；
Step 3：According to fault message, trip signal is sent to corresponding breaker.
Embodiment 2
Certain station model that Guizhou Liu Panshui is built on RTDS does simulating, verifying, and model emulation figure is as shown in Figure 9.Exist respectively
High-voltage side bus, three side of transformer and mesolow side bus setting single-phase short circuit, phase fault, three-phase shortcircuit, two phase ground
Short circuit, developing fault and metastatic failure verify station domain defencive function.Verification result is as shown in table 1.
1. simulation results of table
Verification result, which shows to carry station domain protection scheme, can accurately identify various failures in station, meet protection rapidity,
Selectivity, sensitivity requirements are obviously improved the movement speed protected in station compared with traditional protection.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (4)
1. the station domain protecting method that a kind of logic-based judges, which is characterized in that the method includes：
Step 1：Gathered data, including answering for protection equipment for transformer press off lock signal, overcurrent protection signal, current direction letter
Number, zero-sequencedirectional protection signal, zero-sequence current direction signal and high-pressure side, medium voltage side, low-voltage side outlet protective device away from
From protection signal, zero-sequence current direction signal, zero-sequencedirectional protection signal；
Step 2：It is female to carry out tranformer protection logical AND high-voltage side bus relay protective scheme, medium voltage side bus protection logic and low-pressure side
Line relay protective scheme judges, obtains fault message；
The tranformer protection logic includes the tranformer protection logic sum based on the protection enabling signal in zero-sequence current protection
The tranformer protection logic of lock enabling signal and overcurrent enabling signal, specific logic are pressed off based on answering in multiple pressure latch-up protection
For：
In tranformer protection logic based on zero-sequence current protection signal, without the high voltage side of transformer outlet zero-sequence current in direction
It protects III sections and starts without II sections of the high voltage side of transformer outlet zero-sequence current protection in direction, or without the change in direction
IIII sections of depressor medium voltage side outlet zero-sequence current protection and II sections of transformer medium voltage side outlet zero-sequence current protection without direction
Start, while transformer is high, medium voltage side zero-sequence current direction is not just, to be then determined as that earth fault occurs for transformer；
Based in the tranformer protection logic for pressing off lock overcurrent protection signal again, high voltage side of transformer presses off lock overcurrent protection I again
Duan Qidong, in transformer, that low-pressure side presses off lock signal again is open, at the same in transformer, I section of low-pressure side directional over-current protection it is equal
Do not start, then judges that phase fault occurs for transformer；
Step 3：According to fault message, trip signal is sent to corresponding breaker.
2. the station domain protecting method that a kind of logic-based according to claim 1 judges, which is characterized in that the high-pressure side
Bus protection logic includes high-voltage side bus relay protective scheme based on zero-sequence current protection signal and is protected based on lock overcurrent is pressed off again
The high-voltage side bus relay protective scheme of signal is protected, specific logic is：
In high-voltage side bus relay protective scheme based on zero-sequence current protection signal, without the high voltage side of transformer zero-sequence current in direction
II is protected to start, high voltage side of transformer zero-sequence current direction is just, without III sections of the high-voltage side outlet wire zero-sequence current protection in direction
Start, high-voltage side outlet wire zero sequence direction is not just that I, II, III sections of high-voltage side outlet wire ground distance protection does not start, then judges
Earth fault occurs for high-voltage side bus；
Based on press off again lock overcurrent protection signal high-voltage side bus relay protective scheme in, a high-pressure side at least outlet distance four
Side shape characteristic starts, and I, II, III sections of the distance protection of all outlets does not start, and high voltage side of transformer presses off lock signal and opens again
It puts, while I sections of high voltage side of transformer directional over-current protection does not start, then judges that phase-to phase fault occurs for high-voltage side bus.
3. the station domain protecting method that a kind of logic-based according to claim 1 judges, which is characterized in that medium pressure side
Bus protection logic includes medium voltage side bus protection logic based on zero-sequence current protection signal and is protected based on lock overcurrent is pressed off again
The medium voltage side bus protection logic of signal is protected, specific logic is：
In medium voltage side bus protection logic based on zero-sequence current protection signal, transformer medium voltage side zero sequence direction signal be just,
The II sections of startups of transformer medium voltage side zero-sequence current protection, medium voltage side circuit zero sequence direction signal and medium voltage side line-to-ground distance are protected
Shield signal does not start, while without the III sections of startups of the medium voltage side zero sequence current protection in direction, then judging medium voltage side busbar
Earth fault occurs；
Based in the medium voltage side bus protection logic for pressing off lock overcurrent protection signal again, transformer medium voltage side presses off lock overcurrent and protects again
I sections of startups of shield, I, II, III sections of medium voltage side circuit distance protection do not start, and high voltage side of transformer presses off lock overcurrent protection II again
Duan Qidong then judges that phase fault occurs for medium voltage side busbar.
4. the station domain protecting method that a kind of logic-based according to claim 1 judges, which is characterized in that the low-pressure side
Bus protection logic includes based on the low-pressure side bus relay protective scheme for pressing off lock overcurrent protection signal again, and specific logic is：
Step down side presses off I sections of startups of lock overcurrent protection again, and I, II, III sections of low-pressure side circuit overcurrent protection does not open
Dynamic, high voltage side of transformer presses off II sections of startups of lock overcurrent protection again, then judges that phase fault occurs for low-pressure side bus.
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| CN111123163A (en) * | 2020-04-01 | 2020-05-08 | 广东电网有限责任公司佛山供电局 | Method for manually simulating and testing overcurrent protection action range of re-pressing locking direction |
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