CN108152683A - Based on the earth fault line selection method for helping increasing principle - Google Patents
Based on the earth fault line selection method for helping increasing principle Download PDFInfo
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- CN108152683A CN108152683A CN201810024085.5A CN201810024085A CN108152683A CN 108152683 A CN108152683 A CN 108152683A CN 201810024085 A CN201810024085 A CN 201810024085A CN 108152683 A CN108152683 A CN 108152683A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses based on the earth fault line selection method for helping increasing principle.It, which solves the problems, such as that stable state selection method electric fault amount currently with failure steady-state quantity is small, causes route selection accuracy rate low; with after singlephase earth fault occurs for small current neutral grounding system; fault current steady-state component is made to be significantly increased when bus section breaker is closed or capacitor fling-cut switch is closed; so as to improve the sensitivity of route selection and positioning protection based on failure steady-state quantity; reach reliable route selection and positioning purpose, structure is：It is included by the busbar of protection distribution system, is equipped with capacitor on the busbar and helps to be installed in addition with and puts, and busbar sectional izing switch uses breaker, capacitor help be installed in addition with put, the connection of breaker and measure and control device, measure and control device connect with voltage transformer；Whether measure and control device detection small current neutral grounding system occurs singlephase earth fault, and passes through and the state realization of capacitor switching switch and breaker is controlled to help increasing to earth current.
Description
Technical field
The present invention relates to Earth Fault Detection technology in a kind of electric system more particularly to it is a kind of based on help increase principle it is small
Current earthing fault-line selecting method.
Background technology
At present, 6-35kV power distribution networks in China mainly use small current neutral grounding mode.It is single in low current neutral grounding system fault
Phase earth fault odds highest, therefore realize that single-phase earth fault line selection has the safe and reliable operation of electric system
Very great meaning.
By years of researches, come out there are many route selection criterion and put into onsite application, but most location designs are all
It is criterion based on smaller fault characteristic value, in high transition Resistance Fault, route selection accuracy rate is not high.The event of small current neutral grounding at present
Barrier location design mainly has 4 classes：First, the low-current ground fault line selection principle based on steady state fault amount, this method mainly utilize
Steady state fault amount during singlephase earth fault is criterion, and method is simple, but fault characteristic value is small, is not easy to detect.Second is that based on temporary
The low-current ground fault line selection principle of state failure amount, this method mainly using singlephase earth fault when transient fault amount to sentence
According to, it is bigger than steady state fault characteristic quantity, but the duration is shorter, hardly possible detection.Third, the small current neutral grounding event based on additional diagnosis
Hinder location design, which has broken in the past just with circuit fault-signal itself as route selection criterion, utilizes injection device
Special signal is mutually injected to failure, but is influenced by distribution capacity and transition resistance, Injection Signal is smaller, and need to increase injection
Device, cost increase.Four be the route selection criterion based on signal fused technology, and criterion fusion is a variety of to be based on stable state and transient fault
The location design of characteristic quantity improves route selection accuracy rate, but because each route selection criterion is still with smaller feature to a certain extent
It measures as criterion, therefore route selection accuracy rate is low during high transition Resistance Fault, does not solve the problems, such as that route selection accuracy rate is low fundamentally.
Invention content
The purpose of the present invention is exactly small currently based on the stable state selection method electric fault amount of failure steady-state quantity in order to solve
The problem of causing route selection accuracy rate low, is provided based on the earth fault line selection method for helping increasing principle, and this method is small
When current grounding system singlephase earth fault occurs, different realization methods, purpose are selected according to the difference of busbar mode
It is the zero-sequence current for increasing faulty line in short-term when singlephase earth fault occurs for system, and the zero-sequence current of non-fault line is still
For the capacitance current of circuit in itself, so as to widen the gap of zero-sequence current between faulty line and non-fault line, route selection is improved
Accuracy rate.
To achieve the above object, the present invention adopts the following technical scheme that.
Based on the earth fault line selection method that increases principle is helped, it is included by the busbar of protection distribution system, described
It capacitor on busbar is installed helps to be installed in addition with and put, busbar sectional izing switch uses breaker（Breaker described herein refers both to bus section
Breaker）, capacitor help be installed in addition with put, the connection of breaker and measure and control device, measure and control device connect with voltage transformer；Measure and control device
Whether detection small current neutral grounding system occurs singlephase earth fault, and passes through the state for controlling capacitor switching switch and breaker
Realization helps increasing to earth current.
The measure and control device is by three-phase voltage, residual voltage acquisition module, circuit-breaker status detection module, killer switch
Drive module, capacitor switching switch drive module, human-computer dialogue module and CPU compositions, monitor the three of small current neutral grounding system
Phase voltage and residual voltage judge whether system occurs singlephase earth fault, so that breaker and capacitor switching be controlled to switch
Action.Wherein, three-phase voltage, residual voltage acquisition module by voltage transmitter, RC low-pass filtering, be made of operational amplifier
It pre-processes circuit and A/D conversion circuits is formed；Circuit-breaker status detection module is made of auxiliary contacts of circuit breaker and detection circuit；
Killer switch drive module and capacitor switching switch drive module are made of relay drive circuit and control relay；People
Machine session module is made of button and LCD MODULE；CPU is made of STC12C5A60S2 microcontrollers, mainly according to three-phase electricity
Pressure and residual voltage judge whether that single-phase open circuit before connecing earth fault, the failure of storage circuit-breaker status detection module acquisition occurs
The state of device, singlephase earth fault send out out killer switch drive module and capacitor switching switch drive module when occurring
It closes and divides, the instruction of conjunction, selects the functions such as faulty line, human-computer dialogue.
The capacitor, which is helped in each phase for being installed in addition with and putting and be included in busbar, sets at least one capacitor, they form capacitance
Device group, one end of each capacitor are connected respectively at respective fling-cut switch, another ground connection.
If a. system be sectionalized single busbar connection isolated neutral system, the breaker be busbar sectional izing switch, small electricity
When flowing earthed system normal operation, which is in closure or off-state according to the needs of the method for operation, and by breaker
State detection module detects circuit-breaker status；When singlephase earth fault occurs for small current neutral grounding system, if breaker is before failure
Off-state is closed by measure and control device after failure；If breaker is closed state before failure, will by measure and control device after failure
Capacitor switching switch is closed；If b. system busbar mode is single bus system, i.e., bus section breaker and II section of busbar be not
It is present in the system, after singlephase earth fault occurs for this system, capacitor switching is switched by measure and control device and is closed.Its purpose
It is the zero-sequence current for increasing faulty line in short-term when singlephase earth fault occurs for system, and the zero-sequence current of non-fault line is still
For the capacitance current of circuit in itself, so as to widen the gap of zero-sequence current between faulty line and non-fault line, route selection is improved
Accuracy rate.
Based on help increase principle earth fault line selection method, if a. systems for sectionalized single busbar connection neutral point not
Earthed system, its method be,
(1) during small current neutral grounding system normal operation, breaker needs to be opened or closed work, observing and controlling dress according to the method for operation
Real-time monitoring system three-phase voltage, residual voltage and circuit-breaker status are put, and judges whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；When singlephase earth fault occurs, if breaker before failure
It for off-state, is closed after failure by measure and control device, then carries out the selection of faulty line, it, will be breaking after route selection
Device disconnects；If breaker is closed state before failure, capacitor switching is switched by measure and control device after failure and is closed, is then carried out
The selection of faulty line after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1)；
If b. system busbar mode is single bus system, i.e. bus section breaker and II section of busbar is not present in the system,
Its method is,
(1) during small current neutral grounding system normal operation, measure and control device real-time monitoring system three-phase voltage and residual voltage, and judge
Whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；It, will be electric by measure and control device when singlephase earth fault occurs
Container fling-cut switch is closed, and then carries out the selection of faulty line, after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1).
The present invention the course of work be：For the small current neutral grounding system of operation, by measure and control device real-time monitoring system
The state of three-phase voltage, residual voltage and breaker, and whether real-time judge system occurs singlephase earth fault.System is normally transported
During row, breaker needs to be opened or closed work according to the method for operation, and capacitor switching switch is to disconnect, and capacitor helps increasing
Device is not put into.When singlephase earth fault occurs, if a. systems are sectionalized single busbar connection isolated neutral system, failure
Preceding breaker is off-state, is closed after failure by measure and control device；If breaker is closed state before failure, after failure by
Capacitor switching is switched and is closed by measure and control device；B. if system busbar mode is single bus system, will by measure and control device after failure
Capacitor switching switch is closed.The purpose is to increase the zero-sequence current of faulty line, and the zero-sequence current of non-fault line is still
The capacitance current of circuit in itself, so as to widen the gap of zero-sequence current between faulty line and non-fault line, improves route selection
Accuracy rate.After route selection, breaker is restored to the state of former job requirement, capacitor switching is switched disconnect immediately, no
The operation of system can be adversely affected.
The beneficial effects of the invention are as follows：(1) present invention is after singlephase earth fault occurs for small current neutral grounding system, by disconnected
Road device or capacitor help the zero-sequence current for being installed in addition with and putting and increasing faulty line in short-term, and the zero-sequence current of non-fault line is still circuit
The capacitance current of itself so as to widen the gap of zero-sequence current between faulty line and non-fault line, makes based on failure stable state
The stable state route selection and positioning protection of amount are more accurate.(2) improve what stable state route selection and positioning based on failure steady-state quantity were protected
Anti- transition resistance ability since invention increases zero-sequence currents, strengthens the fault degree of trouble point, has been correspondingly improved anti-
Transition resistance ability.
In short, the invention can effectively improve the accuracy rate of stable state route selection and positioning protection based on failure steady-state quantity.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is measure and control device functional block diagram.
Fig. 3 corresponds to the method for the present invention flow chart for sectionalized single busbar connection isolated neutral system.
Fig. 4 corresponds to the method for the present invention flow chart for single bus system isolated neutral system.
Wherein, 1, I sections of busbares, 2, bus section breaker, 3, capacitor switching switch, 4, capacitor, 5, measure and control device,
6th, three-phase voltage, residual voltage acquisition module, 7, circuit-breaker status detection module, 8, killer switch drive module, 9, capacitance
Device fling-cut switch drive module, 10, human-computer dialogue module, 11, CPU, 12, voltage transformer, 13, II sections of busbar institute links.
Specific embodiment
In Fig. 1, capacitor 4, bus section are installed in each phase of shielded small current neutral grounding system I sections of busbares 1
Switch connects II section of busbar institute link 13 using breaker 2, the other end.As shown in Fig. 2, in sectionalized single busbar connection neutral point
In isolated neutral system, measure and control device 5 is for monitoring whether small current neutral grounding system occurs singlephase earth fault, so as to control open circuit
3 action of device 2 and capacitor switching switch；If system busbar mode is single bus system, i.e., breaker 2 and killer switch drive
When module 8 is not present in the system, measure and control device 5 is used to monitor whether small current neutral grounding system occurs singlephase earth fault,
So as to control 3 action of capacitor switching switch.Measure and control device 5 is by three-phase voltage, residual voltage acquisition module 6, circuit-breaker status
Detection module 7, killer switch drive module 8, capacitor switching switch drive module 9, human-computer dialogue module 10 and CPU 11
Composition, monitors three-phase voltage and the residual voltage of small current neutral grounding system to judge whether system occurs singlephase earth fault, from
And control breaker and capacitor switching switch motion.Wherein, three-phase voltage, residual voltage acquisition module 6 by voltage transmitter,
RC low-pass filtering, the pretreatment circuit being made of operational amplifier and A/D conversion circuits are formed；Circuit-breaker status detection module 7
It is made of auxiliary contacts of circuit breaker and detection circuit；Killer switch drive module 8 and capacitor switching switch drive module 9 by
Relay drive circuit and control relay are formed；Human-computer dialogue module 10 is made of button and LCD MODULE；CPU 11
It is made of STC12C5A60S2 microcontrollers, is mainly judged whether that single-phase ground connection event occurs according to three-phase voltage and residual voltage
To open circuit when the state of breaker 2, singlephase earth fault occur before the failure that barrier, storage circuit-breaker status detection module 7 acquire
Device switch drive module 8 and capacitor switching switch drive module 9 send out switch point, the instruction closed, select faulty line, is man-machine
The functions such as dialogue.Measure and control device 5 is also connect with voltage transformer 12.
If a. system is sectionalized single busbar connection isolated neutral system, method of the invention is as shown in Figure 3：
(1) during small current neutral grounding system normal operation, breaker needs to be opened or closed work, observing and controlling dress according to the method for operation
Real-time monitoring system three-phase voltage, residual voltage and circuit-breaker status are put, and judges whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；When singlephase earth fault occurs, if breaker before failure
It for off-state, is closed after failure by measure and control device, then carries out the selection of faulty line, it, will be breaking after route selection
Device disconnects；If breaker is closed state before failure, capacitor switching is switched by measure and control device after failure and is closed, is then carried out
The selection of faulty line after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1).
If b. system busbar mode is single bus system, i.e. bus section breaker 2 and II section of busbar 13 is not present in this
In system, method of the invention is as shown in Figure 4：
(1) during small current neutral grounding system normal operation, measure and control device real-time monitoring system three-phase voltage and residual voltage, and judge
Whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；It, will be electric by measure and control device when singlephase earth fault occurs
Container fling-cut switch is closed, and then carries out the selection of faulty line, after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1).
In Fig. 1, it is assumed that singlephase earth fault occurs for the C phases of circuit II.If a. system for sectionalized single busbar connection neutral point not
Earthed system, breaker 2 is off-state before failure, is closed after failure by measure and control device 5；If breaker 2 is before failure
Capacitor switching switch 3 is closed after failure by closed state by measure and control device；If b. system busbar mode is single bus system,
That is bus section breaker 2 and II section of busbar 13 is not present in the system, after singlephase earth fault occurs for this system, by observing and controlling
Capacitor switching switch 3 is closed by device 5.The purpose is to increase faulty line in short-term when singlephase earth fault occurs for system
Zero-sequence current, and the zero-sequence current of non-fault line is still the capacitance current of circuit in itself, so as to widen faulty line and non-event
The gap of zero-sequence current between barrier circuit can improve the accuracy of judgement of stable state route selection and the positioning protection using failure steady-state quantity
Rate.
Claims (5)
1. based on the earth fault line selection method for helping increasing principle, it is included by the busbar of protection distribution system, the mother
Capacitor on line be installed help to be installed in addition with and put, busbar sectional izing switch uses breaker, capacitor help be installed in addition with put, breaker and observing and controlling dress
Connection is put, measure and control device is connect with voltage transformer；Whether measure and control device detection small current neutral grounding system occurs single-phase earthing event
Barrier, and pass through and the state realization of capacitor switching switch and breaker is controlled to help increasing to earth current.
2. it is according to claim 1 based on the earth fault line selection method for helping increasing principle, it is characterized in that：The survey
Device is controlled by three-phase voltage, residual voltage acquisition module, circuit-breaker status detection module, killer switch drive module, capacitance
Device fling-cut switch drive module, human-computer dialogue module and CPU compositions monitor the three-phase voltage of small current neutral grounding system and zero sequence electricity
It presses to judge whether system occurs singlephase earth fault, so as to control breaker and capacitor switching switch motion；Wherein, three-phase
Voltage, residual voltage acquisition module are by voltage transmitter, RC low-pass filtering, the pretreatment circuit and A/ being made of operational amplifier
D conversion circuits are formed；Circuit-breaker status detection module is made of auxiliary contacts of circuit breaker and detection circuit；Killer switch drives
Module and capacitor switching switch drive module are made of relay drive circuit and control relay；Human-computer dialogue module is by pressing
Key and LCD MODULE are formed；CPU is made of STC12C5A60S2 microcontrollers, is mainly sentenced according to three-phase voltage and residual voltage
It is disconnected that the single-phase state of breaker before earth fault, the failure of storage circuit-breaker status detection module acquisition, single-phase of connecing whether occurs
Earth fault occur when to killer switch drive module and capacitor switching switch drive module send out switch division instruction,
Select the functions such as faulty line, human-computer dialogue.
3. it is according to claim 1 based on the earth fault line selection method for helping increasing principle, it is characterized in that：The electricity
Container, which is helped in each phase for being installed in addition with and putting and be included in busbar, sets at least one capacitor, they form capacitor group, each capacitance
One end of device is connected respectively at respective fling-cut switch, other end ground connection.
4. it is according to claim 1 based on the earth fault line selection method for helping increasing principle, it is characterized in that：If a. it is
It unites as sectionalized single busbar connection isolated neutral system, the breaker is busbar sectional izing switch, and small current neutral grounding system is normal
During operation, which is in closure or off-state according to the needs of the method for operation, and is examined by circuit-breaker status detection module
Survey circuit-breaker status；When singlephase earth fault occurs for small current neutral grounding system, if breaker is off-state before failure, after failure
It is closed by measure and control device；If breaker is closed state before failure, capacitor switching is switched by measure and control device after failure
It is closed；If b. system busbar mode is single bus system, i.e. bus section breaker and II section of busbar is not present in the system,
After singlephase earth fault occurs for this system, capacitor switching is switched by measure and control device and is closed；It is single the purpose is to occur in system
Increase the zero-sequence current of faulty line during phase earth fault in short-term, and the zero-sequence current of non-fault line is still the electricity of circuit in itself
Capacitance current so as to widen the gap of zero-sequence current between faulty line and non-fault line, improves the accuracy rate of route selection.
5. it is according to claim 1 based on the earth fault line selection method for helping increasing principle, it is characterized in that：If a.
System is sectionalized single busbar connection isolated neutral system, its method is,
(1) during small current neutral grounding system normal operation, breaker needs to be opened or closed work, observing and controlling dress according to the method for operation
Real-time monitoring system three-phase voltage, residual voltage and circuit-breaker status are put, and judges whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；When singlephase earth fault occurs, if breaker before failure
It for off-state, is closed after failure by measure and control device, then carries out the selection of faulty line, it, will be breaking after route selection
Device disconnects；If breaker is closed state before failure, capacitor switching is switched by measure and control device after failure and is closed, is then carried out
The selection of faulty line after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1)；
If b. system busbar mode is single bus system, i.e. bus section breaker and II section of busbar is not present in the system,
Its method is,
(1) during small current neutral grounding system normal operation, measure and control device real-time monitoring system three-phase voltage and residual voltage, and judge
Whether system occurs singlephase earth fault；
(2) when not having singlephase earth fault, step (1) is repeated；It, will be electric by measure and control device when singlephase earth fault occurs
Container fling-cut switch is closed, and then carries out the selection of faulty line, after route selection, capacitor switching is switched and is disconnected；
(3) continue to monitor busbar voltage and system residual voltage, and judge whether singlephase earth fault releases；
(4) if failure does not release, continue the operation of step (3)；
(5) if failure has released, aforesaid operations are re-started back to step (1).
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| CN109669095A (en) * | 2019-01-21 | 2019-04-23 | 济南大学 | A kind of isolated neutral system fault line selection method for single-phase-to-ground fault |
| CN110133446A (en) * | 2019-06-12 | 2019-08-16 | 中国石化集团胜利石油管理局有限公司电力分公司 | The earth fault line selection method and device of topological graph |
| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
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| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
| CN114089107B (en) * | 2021-11-16 | 2023-12-22 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for single-phase grounding fault handling of transformer substation center point grounding |
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Application publication date: 20180612 |