CN109638793A - A kind of singlephase earth fault processing method suitable for small current neutral grounding system - Google Patents
A kind of singlephase earth fault processing method suitable for small current neutral grounding system Download PDFInfo
- Publication number
- CN109638793A CN109638793A CN201811581072.4A CN201811581072A CN109638793A CN 109638793 A CN109638793 A CN 109638793A CN 201811581072 A CN201811581072 A CN 201811581072A CN 109638793 A CN109638793 A CN 109638793A
- Authority
- CN
- China
- Prior art keywords
- time
- fault
- route
- definite value
- delay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/266—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving switching on a spare supply
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of singlephase earth fault processing method suitable for small current neutral grounding system; the matching problem of outlet protection and route protection when solving singlephase earth fault in small current neutral grounding system; for radial route and hand in hand route; the small current grounding fault guard method using load power direction, ground fault transient power direction and the delay cooperation of each terminal is proposed respectively, realizes the nearest isolation of small current grounding fault respectively.All upstreams, which perfect section, can cut off failure without having a power failure, and in network hand in hand, downstream sound circuit can also be directly transferred to backup power source.The present invention can adapt to different mode distribution automation system and distribution line protection device, realizes quick, the accurate processing of small current grounding fault, has extensive practical application value.
Description
Technical field
It a kind of connects the invention belongs to power distribution network relay protection field more particularly to suitable for the single-phase of small current neutral grounding system
Earth fault processing method.
Background technique
Small current grounding fault location technology has become research hotspot in recent years.Field application includes that centralized feeder line is automatic
Change, mostly uses distribution terminal or fault detector to acquire ground fault transient current waveform, as " distribution automation system is small for paper
Current earthing fault transient location technology " centralized feeder automation method using transient current waveform similarity is proposed,
Positioning master station determines fault section using transient current similarity principle, and location algorithm is complex, different manufacturers terminal and master
Cooperation of standing acquires a certain degree of difficulty；In distributed feeder automation, since the information that can be utilized is less, it is based on transient current similitude
Algorithm it is more more difficult than hubbed mode.In addition, type feeder automation such as paper is " based on voltage-time type automatic circuit on the spot
The technical research of one-phase earthing failure in electric distribution network automatism isolation ", utilize voltage-time type block switch isolated fault, scope of power outage
Greatly, the time is long, is primarily adapted for use in the route of less demanding to power supply reliability.
When small current grounding fault occurs, it can realize that small current grounding fault is fixed using each section transient power feature difference
Position, principle is similar to Double-End Source line short fault positioning principle, and algorithm is simple, and the feeder line that can adapt to different mode is automatic
Change.Realize that small current grounding fault feeder automation has unique advantage using transient power direction, but conventional terminal cannot
Residual voltage is obtained, the popularization and application of the technology are limited.State Grid Corporation of China is formulating relevant criterion in the recent period, and quasi- realization is matched
One secondary device of electric switch merges, it is desirable that the residual voltage of the newly-built panel switches configuration forms such as capacitance partial pressure or electric resistance partial pressure
Sensor；Southern Power Grid Company also configures zero sequential potential transformer in pilot panel switches.The acquisition of residual voltage will be utilization
The small current grounding fault in transient power direction detects and processing technique provides development opportunity.
Terminal needs reporting fault transient power direction in centralized feeder automation, and main website is according to fault point two sides transient state function
Rate is contrary and perfects the identical feature Judging fault section in section transient power direction, and remote control trouble point two sides switch is jumped
Lock；In distributed feeder automation, adjacent end need to exchange transient power directional information, when two sides transient power is contrary
It is judged to fault section, and controls two sides switch trip.But in centralized feeder automation and distributed feeder automation mode,
Communication channel is needed, does not adapt to the distribution protection system for not having communication condition.
In addition, the short trouble protection of distribution line has more mature configuration and setting program at present, but for small
Current earthing failure, still shortage principle are perfect, reliable in action, realize simple protection scheme.The acquisition of residual voltage and temporarily
The application of state power direction makes it possible to realize that small current grounding fault is protected using transient power direction.
Summary of the invention
Present invention aims to overcome that above-mentioned the deficiencies in the prior art, provide a kind of suitable for small current neutral grounding system
Singlephase earth fault processing method, is specifically realized by the following technical scheme:
The singlephase earth fault processing method suitable for small current neutral grounding system is applied to single supply and radiates molded line
Road is cooperated using ground fault transient reactive power direction and delay time, controls the adjacent upstream of small current grounding fault point
Switch trip includes the following steps:
Step 1) is that outlet protection and route protections at different levels configure different delay definite values:
First delay definite value setting are as follows: backbone and each branch line least significant end protective device delay definite value are time T, main
Each protective device delay time of main line is from line end to bus time step △ T incremented by successively；Branch line guarantors at different levels
Protect delay time from load side to branch point from time step △ T incremented by successively；Second delay definite value setting are as follows: Suo Youbao
The delay definite value of protection unit is infinity；
When detecting that residual voltage is more than preset threshold, error protection is opened for step 2) outlet protection and route protections at different levels
It is dynamic, and calculated load power direction and ground fault transient reactive power direction；
Load power direction of each protective device of step 3) according to ground fault transient reactive power direction and when necessary
Selection delay definite value: when ground fault transient reactive power flows to bus by route, protective device delay definite value selects first
Be delayed definite value；When ground fault transient reactive power flows to route by bus, protective device delay definite value selects the second delay
Definite value；
Step 4) is when trouble duration reaches pre-set value, control switch movement excision failure；When failure continues
Between not up to pre-set value when, then protect return.
The singlephase earth fault processing method suitable for small current neutral grounding system it is further design be, the step
It is rapid 1) in △ T according to formula (1) choose,
Δ T=t1b+t2l+top+tu+tm (1)
Wherein, t1bThe advanced error of delay cell is protected for the same level；t2lLag for the delay cell of next stage protection is missed
Difference；topFor block switch opening time；tuFor voltage recovery time；tmFor time margin.
The singlephase earth fault processing method suitable for small current neutral grounding system it is further design be, the step
It is rapid 4) in control switch movement excision failure when,
For stable fault, when reaching pre-set value, directly trip isolated fault section；
For intermittent arc grounding failure, T is defined0To add up the arcing time；T1For blow-out time gate threshold value, according to two
Blow-out time T between secondary arcing2Length, be divided into the following two kinds situation, work as T0It is jumped after being accumulated to the delay time adjusted in advance
Lock；
Situation 1) work as T2< T1When, the arcing time is included in T twice0；
Situation 2) work as T2> T1When, assert that singlephase earth fault twice occurs for route, and by T0It resets, from second of arcing
Restart timing.
The further design of the singlephase earth fault processing method suitable for small current neutral grounding system is, described pre-
Setting value is set as 1-2 hours.
The singlephase earth fault processing method suitable for small current neutral grounding system, applied to there is pulling for backup power source
Hand line road, when singlephase earth fault occurs, upstream detection point transient reactive power in fault point flows to bus by route；Under fault point
It swims test point transient reactive power and route is flowed to by bus, switched, passed through by transient power direction discernment fault point upstream and downstream
Delay time ensures that load side switch first trips, and includes the following steps:
Step 1) is that outlet protection and route protections at different levels configure different delay definite values, is respectively as follows:
First delay definite value setting are as follows: the fault section power outlet protective device definite value that is delayed is time T, remaining is each for route
Protective device delay time is from fault section power supply to backup power source time step △ T incremented by successively；
Second delay definite value setting are as follows: backup power source outlet wire protecting device is delayed definite value as on the basis of its definite value 1 that is delayed
On be further added by a time step △ T, remaining each protective device delay time of route from backup power source to fault section power supply after
Continue time step △ T incremented by successively；
Third delay definite value setting are as follows: backup power source outlet wire protecting device delay definite value is time T, remaining each protection of route
Device delay time is from backup power source to fault section power supply time step △ T incremented by successively；
4th delay definite value setting are as follows: fault section power outlet protective device is delayed definite value as in its definite value 3 that is delayed
On the basis of be further added by a time step △ T, remaining each protective device delay time of route is from fault section power supply to standby electricity
Continue time step △ T incremented by successively in source；(power supply 1 why power supply, power supply 2 why power supply, brief function please be use
Property word is defined and is replaced respectively to power supply 1, power supply 2 as attribute, is otherwise caused unclear)
When detecting that residual voltage is more than preset threshold, error protection is opened for step 2) outlet protection and route protections at different levels
It is dynamic, and calculated load power direction and ground fault transient reactive power direction；
Each protective device of step 3) is delayed according to ground fault transient reactive power direction and load power direction selection
Definite value, when detecting that load power direction is flowed out by fault section power supply and transient reactive power is by fault section power supply flow line
Lu Shi, protective device delay definite value select the first delay definite value；When detecting that load power direction flowed out by fault section power supply
And transient reactive power is when flowing to fault section power supply by route, the protective device definite value that is delayed selects the second delay definite value；Work as inspection
Load power direction is measured by backup power source outflow and when transient reactive power flows to route by backup power source, protective device delay
Definite value selects third delay definite value；When detect load power direction by backup power source outflow and transient reactive power by line flows
When to backup power source, the protective device definite value that is delayed selects the 4th delay definite value；
Step 4) is when trouble duration reaches pre-set value, control switch movement excision failure；When failure continues
Between not up to pre-set value when, then protect return.
The singlephase earth fault processing method suitable for small current neutral grounding system it is further design be, the step
It is rapid 1) in △ T according to formula (1) choose,
Δ T=t1b+t2l+top+tu+tm (1)
Wherein, t1bThe advanced error of delay cell is protected for the same level；t2lLag for the delay cell of next stage protection is missed
Difference；topFor block switch opening time；tuFor voltage recovery time；tmFor time margin.
The singlephase earth fault processing method suitable for small current neutral grounding system it is further design be, the step
It is rapid 4) in control switch movement excision failure when,
For stable fault, when reaching pre-set value, directly trip isolated fault section；
For intermittent arc grounding failure, T is defined0To add up the arcing time；T1For blow-out time gate threshold value, according to two
Blow-out time T between secondary arcing2Length, be divided into the following two kinds situation, work as T0It is jumped after being accumulated to the delay time adjusted in advance
Lock；
Situation 1) work as T2< T1When, the arcing time is included in T twice0；
Situation 2) work as T2> T1When, assert that singlephase earth fault twice occurs for route, and by T0It resets, from second of arcing
Restart timing.
The further design of the singlephase earth fault processing method suitable for small current neutral grounding system is, described pre-
Setting value is set as 1-2 hours.
Advantages of the present invention is as follows:
Compared to the centralized feeder automation method using transient-wave similitude, the present invention does not need communication channel,
And without different manufacturers terminal and main website matching problem, isolation time is short；Event is isolated compared to using voltage-time type block switch
Barrier method does not need to have a power failure the invention has the advantages that fault point upstream perfects section, and fault outage range is small, and when troubleshooting
Between it is short；Compared to the transient power direction ground protection of centralized feeder automation and distributed feeder automation mode, this hair
It is bright independent of communication network, and fault handling time is shorter compared to centralized feeder automation mode.
Detailed description of the invention
Attached drawing 1 is that (wherein ■ represents wire-outgoing breaker to single supply distribution line structure chart；● represent block switch).
Attached drawing 2 is that (wherein ■ represents wire-outgoing breaker to distribution line structure chart hand in hand；● represent block switch).
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Short trouble mostly uses overcurrent protection method, fixed merely with electric current since distribution line is compared with short, branched line is more
Value cannot achieve the cooperation between outlet protection and branch line protection, distribution transforming protection, and multi-pass crosses delay to cooperate between protections at different levels,
To guarantee rapidity, series general control is within three-level.For low current singlephase earth fault, fault point upstream and downstream all exists
Capacitance current；Especially in arc suppression coil system, due to the compensating action of arc suppression coil, fault point upstream and downstream current difference compared with
It is small, it can not used electric current principle realization protection.Ground protection can be realized using transient power direction, and is realized using different delayed time
Protection cooperations at different levels.Simultaneously as earth-fault current is small, the mute time is not strict with, compared to short trouble, is protected
Shield series can increase, and differential between two class protection can also increase.
I, it is based on attached single supply distribution line structure chart shown in FIG. 1, the route for selecting test point most is basic routing line,
Transient power direction character is as follows: 1. when singlephase earth fault occurs for basic routing line, fault point upstream basic routing line test point
When reactive power direction flows to bus by route, remaining test point flows to route by bus；2. when branched line breaks down
When, fault point upstream detection point and the basic routing line test point of the branch line upstream (are referred to as the inspection of fault point upstream in branch line
Measuring point) transient reactive power by route flows to bus, and the equal transient reactive power of remaining test point flows to route by bus.
For radial pattern route, need to only make the adjacent upstream switch tripping in fault point, using transient power direction and
Delay time cooperation control fault section source-side switches tripping.Concrete thought are as follows: no matter basic routing line switch or branch line
Switch, transient reactive power trip after flowing to bus and arrival delay time by route.
Concrete principle combination attached drawing 1 is illustrated.To ensure that the upstream switch close to fault point trips, basic routing line is respectively opened
Close (QF1~QL41), delay time is incremented by successively from load side to source side, respectively T, T+ Δ T, T+2 Δ T, T+3 Δ T, T+4
ΔT,T+5ΔT,T+6ΔT,T+7ΔT；Branch's wiretap needs to cooperate with basic routing line switch, also in compliance with above-mentioned rule, by T
Start incremented by successively from load side to source side.Since basic routing line switch number is most, branch's wiretap can be made using this method
The small basic routing line switch of trip thereon of delay time.No matter basic routing line failure or branch line failure, can ensure that fault point is tight
Adjacent upstream switch first trips.
With switch QL12、QL21Between occur singlephase earth fault for, block switch QF1、QL11And QL12Detect this
Ground transient reactive power flows to bus by route, and timing is respectively started.Switch QL after T+5 Δ T12Tripping excision failure, QF1、QL11
Switch returns, and upstream perfects section and restores to operate normally.
Different from short trouble, earth-fault current is very small.Therefore in small current grounding fault protection, breaker is removed
Outside, the on-load switch for configuring protective device can also cut off failure.
II, based on it is attached it is shown in Fig. 2 have backup power source distribution line structure chart, illustrate the particular content of the technology.
In radial pattern Protection Scheme for Transmission Line, the tripping of fault section source-side switches need to be only controlled.For there is backup power source
Route hand in hand also needs control fault section load side switch trip, it is ensured that downstream sound circuit safe transfer to backup power source.
If source-side switches first trip, fault signature also disappears immediately at load side switch, therefore need to ensure that load side is opened
It first trips pass.When singlephase earth fault occurs, upstream detection point transient reactive power in fault point flows to bus by route；Fault point
Detected downstream point transient reactive power flows to route by bus.This programme is opened using transient power direction discernment fault point upstream and downstream
It closes, ensures that load side switch first trips using delay time.
The setting of delay time.As shown in Fig. 2, power supply 1 is fault section power supply, power supply 2 is backup power source, by power supply 1
Power supply, load power direction flows out transient reactive power by power supply 1 and flows to route by bus, each to switch (QF1~QF2) delay when
Between respectively adjusting be T, T+ Δ T, T+2 Δ T, T+3 Δ T, T+4 Δ T, T+5 Δ T, T+6 Δ T, T+7 Δ T；Transient reactive power by
It is each to switch (QF when route flows to bus1~QF2) delay time adjusted respectively as T+15 Δ T, T+14 Δ T, T+13 Δ T, T+12
ΔT,T+11ΔT,T+10ΔT,T+9ΔT,T+8ΔT.Powered by power supply 2, load power direction is flowed out by power supply 2, transient state without
Function power flows to route by bus, each to switch (QF1~QF2) delay time adjusted respectively as T+7 Δ T, T+6 Δ T, T+5 Δ T, T+
4ΔT,T+3ΔT,T+2ΔT,T+ΔT,T；It is each to switch (QF when transient reactive power flows to bus by route1~QF2) delay when
Between respectively adjusting be T+8 Δ T, T+9 Δ T, T+10 Δ T, T+11 Δ T, T+12 Δ T, T+13 Δ T, T+14 Δ T, T+15 Δ T
This programme delay time is codetermined by transient power direction and power supply.Therefore it proposes to utilize load power side
To the method for identification power supply: if the load power direction of switch is flowed out by power supply 1, determining its power supply for power supply 1；Instead
It, is power supply 2.
When normal operation, interconnection switch QL4For off-state, rest switch is closed state.Section QF1~QL3By power supply
1 power supply, uses the 1st set of definite value；Section QF2~QL5It is powered by power supply 2, uses the 2nd set of definite value.
If switch QL1、QL2Between singlephase earth fault, switch QL occurs2、QL3Detect local transient reactive power
Route is flowed to by bus, singlephase earth fault timing, switch QL after T+2 Δ T is respectively started2Tripping, switch QL3Decompression returns；It opens
Close QF1、QL1It detects that local transient reactive power flows to bus by route, singlephase earth fault timing, T+14 is respectively started
Switch QL after Δ T1Tripping；Voltage restores normal, QF1It returns.Trouble point downstream of interconnection switch QL4 combined floodgate restoring perfects section confession
Electricity；So far, Fault Isolation success, all sections that perfect do not undergo power failure, can close interconnection switch after Fault Isolation success, restore
Downstream perfects section normal operation.
The above, is only presently preferred embodiments of the present invention, is not that the invention has other forms of limitations, any ripe
Know the equivalent reality that professional and technical personnel was changed or be modified as equivalent variations possibly also with the technology contents of the disclosure above
Apply example.But without departing from the technical solutions of the present invention, to the above embodiments according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling, still fall within the protection scope of technical solution of the present invention.
Claims (8)
1. a kind of singlephase earth fault processing method suitable for small current neutral grounding system is applied to single supply radial pattern route,
Cooperated using ground fault transient reactive power direction and delay time, controls the adjacent upstream switch of small current grounding fault point
Tripping, it is characterised in that include the following steps:
Step 1) is that outlet protection and route protections at different levels configure different delay definite values:
First delay definite value setting are as follows: backbone and each branch line least significant end protective device delay definite value be time T, backbone
Each protective device delay time in road is from line end to bus time step △ T incremented by successively；Branch line protections at different levels are prolonged
When the time from load side to branch point from time step △ T incremented by successively；Second delay definite value setting are as follows: all protection dresses
The delay definite value set is infinity；
Step 2) outlet protection and route protections at different levels are when detecting that residual voltage is more than preset threshold, error protection starting,
And calculated load power direction and ground fault transient reactive power direction；
Load power direction selection of each protective device of step 3) according to ground fault transient reactive power direction and when necessary
Be delayed definite value: when ground fault transient reactive power flows to bus by route, protective device delay definite value selects the first delay
Definite value；When ground fault transient reactive power flows to route by bus, protective device delay definite value selects the second delay definite value；
Step 4) is when trouble duration reaches pre-set value, control switch movement excision failure；When trouble duration not
When reaching pre-set value, then return is protected.
2. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system it is characterized in that
△ T in the step 1) chooses according to formula (1),
Δ T=t1b+t2l+top+tu+tm (1)
Wherein, t1bThe advanced error of delay cell is protected for the same level；t2lFor the hysteresis error of the delay cell of next stage protection；
topFor block switch opening time；tuFor voltage recovery time；tmFor time margin.
3. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system, feature exist
In the step 4) when control switch movement excision failure,
For stable fault, when reaching pre-set value, directly trip isolated fault section；
For intermittent arc grounding failure, T is defined0To add up the arcing time；T1For blow-out time gate threshold value, according to firing twice
Blow-out time T between arc2Length, be divided into the following two kinds situation, work as T0It trips after being accumulated to the delay time adjusted in advance；
Situation 1) work as T2< T1When, the arcing time is included in T twice0；
Situation 2) work as T2> T1When, assert that singlephase earth fault twice occurs for route, and by T0It resets, again from second of arcing
Start timing.
4. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system, feature exist
It is set as 1-2 hours in the pre-set value.
5. a kind of singlephase earth fault processing method suitable for small current neutral grounding system, applied to have backup power source hand in hand
Route, when singlephase earth fault occurs, upstream detection point transient reactive power in fault point flows to bus by route；Trouble point downstream
Test point transient reactive power flows to route by bus, is switched by transient power direction discernment fault point upstream and downstream, by prolonging
When the time ensure load side switch first trip, it is characterised in that include the following steps:
Step 1) is that outlet protection and route protections at different levels configure different delay definite values, is respectively as follows:
First delay definite value setting are as follows: the fault section power outlet protective device definite value that is delayed is time T, route remaining each protect
Device delay time is from fault section power supply to backup power source time step △ T incremented by successively；
Second delay definite value setting are as follows: backup power source outlet wire protecting device be delayed definite value be its be delayed definite value 1 on the basis of again
Increase a time step △ T, remaining each protective device delay time of route from backup power source to fault section power supply continue according to
It is secondary to be incremented by a time step △ T；
Third delay definite value setting are as follows: backup power source outlet wire protecting device delay definite value is time T, remaining each protective device of route
Delay time is from backup power source to fault section power supply time step △ T incremented by successively；
4th delay definite value setting are as follows: fault section power outlet protective device is delayed definite value as on the basis of its definite value 3 that is delayed
On be further added by a time step △ T, remaining each protective device delay time of route from fault section power supply to backup power source after
Continue time step △ T incremented by successively；
Step 2) outlet protection and route protections at different levels are when detecting that residual voltage is more than preset threshold, error protection starting,
And calculated load power direction and ground fault transient reactive power direction；
Each protective device of step 3) is delayed definite value according to ground fault transient reactive power direction and load power direction selection,
When detecting that load power direction is flowed out by fault section power supply and transient reactive power flows to route by fault section power supply,
Protective device delay definite value selects the first delay definite value；When detecting that load power direction flowed out and transient state by fault section power supply
When reactive power flows to fault section power supply by route, protective device delay definite value selects the second delay definite value；It is negative when detecting
When lotus power direction is flowed out by backup power source and transient reactive power flows to route by backup power source, protective device delay definite value choosing
With third delay definite value；When detect load power direction by backup power source outflow and transient reactive power flowed to by route it is spare
When power supply, protective device delay definite value selects the 4th delay definite value；
Step 4) is when trouble duration reaches pre-set value, control switch movement excision failure；When trouble duration not
When reaching pre-set value, then return is protected.
6. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system, feature exist
△ T in the step 1) chooses according to formula (1),
Δ T=t1b+t2l+top+tu+tm (1)
Wherein, t1bThe advanced error of delay cell is protected for the same level；t2lFor the hysteresis error of the delay cell of next stage protection；
topFor block switch opening time；tuFor voltage recovery time；tmFor time margin.
7. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system, feature exist
In the step 4) when control switch movement excision failure,
For stable fault, when reaching pre-set value, directly trip isolated fault section；
For intermittent arc grounding failure, T is defined0To add up the arcing time；T1For blow-out time gate threshold value, according to firing twice
Blow-out time T between arc2Length, be divided into the following two kinds situation, work as T0It trips after being accumulated to the delay time adjusted in advance；
Situation 1) work as T2< T1When, the arcing time is included in T twice0；
Situation 2) work as T2> T1When, assert that singlephase earth fault twice occurs for route, and by T0It resets, again from second of arcing
Start timing.
8. the singlephase earth fault processing method according to claim 1 suitable for small current neutral grounding system, feature exist
It is set as 1-2 hours in the pre-set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581072.4A CN109638793B (en) | 2018-12-20 | 2018-12-20 | Single-phase earth fault processing method suitable for small current grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581072.4A CN109638793B (en) | 2018-12-20 | 2018-12-20 | Single-phase earth fault processing method suitable for small current grounding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109638793A true CN109638793A (en) | 2019-04-16 |
| CN109638793B CN109638793B (en) | 2020-06-02 |
Family
ID=66076778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811581072.4A Active CN109638793B (en) | 2018-12-20 | 2018-12-20 | Single-phase earth fault processing method suitable for small current grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109638793B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261718A (en) * | 2019-07-16 | 2019-09-20 | 清华大学 | The collection electric line arc light high resistance earthing fault distance measuring method of meter and arc length |
| CN112039031A (en) * | 2019-06-03 | 2020-12-04 | 李景禄 | Differentiation processing and fault area isolation method for single-phase earth fault of power distribution network |
| CN113219307A (en) * | 2021-07-08 | 2021-08-06 | 武汉品迅科技有限公司 | Power distribution network arc light grounding fault identification method based on current traveling wave |
| CN113410822A (en) * | 2020-12-31 | 2021-09-17 | 上海宏力达信息技术股份有限公司 | Self-adaptive distribution line fault protection system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614435A (en) * | 2003-11-07 | 2005-05-11 | 淄博科汇电气有限公司 | Circuit fault directional detecting and protecting method for power supply system |
| CN104166067A (en) * | 2014-08-06 | 2014-11-26 | 湖南英科电力技术有限公司 | Single-phase earth fault positioning detection method and device |
| CN108321780A (en) * | 2018-03-19 | 2018-07-24 | 中国石油大学(华东) | It is a kind of to protect the small resistance grounding system inverse time lag zero sequence excess current earthing protecting method laterally coordinated based on each outlet |
| CN108963990A (en) * | 2018-07-02 | 2018-12-07 | 广西电网有限责任公司电力科学研究院 | Route small current grounding fault processing method hand in hand based on transient power direction |
-
2018
- 2018-12-20 CN CN201811581072.4A patent/CN109638793B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614435A (en) * | 2003-11-07 | 2005-05-11 | 淄博科汇电气有限公司 | Circuit fault directional detecting and protecting method for power supply system |
| CN104166067A (en) * | 2014-08-06 | 2014-11-26 | 湖南英科电力技术有限公司 | Single-phase earth fault positioning detection method and device |
| CN108321780A (en) * | 2018-03-19 | 2018-07-24 | 中国石油大学(华东) | It is a kind of to protect the small resistance grounding system inverse time lag zero sequence excess current earthing protecting method laterally coordinated based on each outlet |
| CN108963990A (en) * | 2018-07-02 | 2018-12-07 | 广西电网有限责任公司电力科学研究院 | Route small current grounding fault processing method hand in hand based on transient power direction |
Non-Patent Citations (1)
| Title |
|---|
| 薛永端等: "基于暂态功率方向的小电流接地故障处理技术", 《供用电》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039031A (en) * | 2019-06-03 | 2020-12-04 | 李景禄 | Differentiation processing and fault area isolation method for single-phase earth fault of power distribution network |
| CN112039031B (en) * | 2019-06-03 | 2022-04-26 | 李景禄 | Differentiation processing and fault area isolation method for single-phase earth fault of power distribution network |
| CN110261718A (en) * | 2019-07-16 | 2019-09-20 | 清华大学 | The collection electric line arc light high resistance earthing fault distance measuring method of meter and arc length |
| CN113410822A (en) * | 2020-12-31 | 2021-09-17 | 上海宏力达信息技术股份有限公司 | Self-adaptive distribution line fault protection system and method |
| CN113410822B (en) * | 2020-12-31 | 2023-08-22 | 上海宏力达信息技术股份有限公司 | Self-adaptive distribution line fault protection system and method |
| CN113219307A (en) * | 2021-07-08 | 2021-08-06 | 武汉品迅科技有限公司 | Power distribution network arc light grounding fault identification method based on current traveling wave |
| CN113219307B (en) * | 2021-07-08 | 2021-10-15 | 武汉品迅科技有限公司 | Power distribution network arc light grounding fault identification method based on current traveling wave |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109638793B (en) | 2020-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109638793A (en) | A kind of singlephase earth fault processing method suitable for small current neutral grounding system | |
| Jahn et al. | Survey of methods for selective DC fault detection in MTDC grids | |
| CN104779594B (en) | Small current neutral grounding power system phase fault and single-phase grounding comprehensive protecting method | |
| AU2019215520B2 (en) | Method and system providing feeder fault response | |
| US11329479B2 (en) | Locating and isolating grid faults utilizing a fast close-open operation | |
| RU2583452C2 (en) | Directed detection of resistive ground fault and rupture of conductor of medium voltage | |
| CN110190591A (en) | A kind of singlephase earth fault automatic processing method and processing system | |
| CN103812095A (en) | Directional pilot protection method for power distribution network containing distributed generation | |
| CN103997024A (en) | Face protection method and system through higher-lower stage blocking | |
| CN104901284A (en) | Detection method and false tripping preventive method of three-phase PT broken line of distance protector | |
| CN112595930A (en) | Backup protection method for petal type urban power grid area containing distributed power supply | |
| CN109387732A (en) | A kind of adaptive in-situ protection method and system of small current grounding fault | |
| US20020080539A1 (en) | Loop restoration scheme for distribution feeders | |
| CN106329492B (en) | A kind of simple bus bar protecting method based on system topological | |
| CN107591784B (en) | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route | |
| CN109412124A (en) | A kind of distribution line phase fault relaying configuration and setting method | |
| CN109217270A (en) | DC line sectional type timing limit overcurrent protection method and device | |
| CN108258660B (en) | Method for processing direct-current side fault of flexible direct-current power grid | |
| CN100440671C (en) | Integrated protection system based on multiple traditional protection technologies | |
| CN107230970A (en) | A kind of singlephase earth fault processing method of the feeder automation of type on the spot | |
| CN206977038U (en) | A kind of route protection measure and control device of integrated earthing wire-selecting function | |
| CN101958579A (en) | Method of treating information loss in centralized protection device of digitalized substation | |
| CN106329714B (en) | A kind of method that dynamic judges power network switch type | |
| CN104701823A (en) | Networking intelligent switch protection system for feeders of power distribution networks | |
| CN104052033B (en) | A kind of guard method based on zero-sequence current correlation coefficient identification fault branch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |