CN107167701A - Automatically method is sentenced in choosing to distribution singlephase earth fault circuit - Google Patents
Automatically method is sentenced in choosing to distribution singlephase earth fault circuit Download PDFInfo
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- CN107167701A CN107167701A CN201710130200.2A CN201710130200A CN107167701A CN 107167701 A CN107167701 A CN 107167701A CN 201710130200 A CN201710130200 A CN 201710130200A CN 107167701 A CN107167701 A CN 107167701A
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- circuit
- earth fault
- singlephase earth
- choosing
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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
- G01R31/081—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
Abstract
The present invention relates to a kind of distribution singlephase earth fault circuit, method is sentenced in choosing automatically, solves the deficiencies in the prior art, technical scheme is：Circuit neutral line current protection device, busbar grounding recoil simulator and the scheduling backstage for being disposed in main website including being disposed in plant stand, circuit neutral line current protection device and busbar grounding recoil simulator are connected with scheduling background communication, step one：Wait circuit neutral line current protection device to act and send singlephase earth fault signal to dispatching backstage；Step 2：Scheduling backstage determines whether to carry out ground connection involution, if transient fault terminates to redirect execution step one after current procedures after then directly making a record, if permanent fault then performs step 3；Step 3：Examination drawing is carried out by regulation and control person, is recorded if route selection examination pulls into work(and execution step one is redirected after permanent fault is handled, sequentially table carries out examination drawing by regulation and control person if route selection examination drawing is unsuccessful.
Description
Technical field
This patent is related to electrical safety technical field, and in particular to a kind of distribution singlephase earth fault circuit selects the side of sentencing automatically
Method.
Background technology
More than 80% line fault is singlephase earth fault or triggered by it in small current neutral grounding system, due to single-phase
2h can be continued to run with by not impacting code regulation during ground connection in line voltage still SYMMETRY THEORY to customer power supply, and although transformer station matches somebody with somebody
Put line-selected earthing device but not high according to operating experience route selection accuracy, it is final that criterion small range is selected using artificial examination drawing more
Examination bracing wire road, at 5 or so, causes because examination drawing adds the power failure in short-term of large number of user, with 10kV outlets statistics every time
Cable increases, and single-phase earth fault current significantly increases and easily develop into alternate ground short circuit failure, influences power grid security, together
If when disposal possibly even cause casualties event not in time, therefore it is single-phase quickly and accurately to judge that faulty line is excluded in time
Earth fault is an important ring for grid operating monitoring.
Conventional failure judgment method has zero-sequence current than width method, 5 subharmonic methods, active component method, current break method, head
Method is sentenced in numerous choosings such as half-wave method, wavelet method, and computation model has differences, but its principle is circuit zero-sequence current when utilizing failure mostly
Component carries out choosing and sentenced, and conventional operating experience also demonstrates the practicality that principle is sentenced in its choosing, but with cable run and arc blowout wire
Enclose the extensive use in power distribution network.Earth-fault current is by arc suppression coil compensation, and current earthing wire-selecting, which can not be selected accurately, to be sentenced,
It is many to revert to again by manually trying to draw choosing to sentence, such as A phase earth faults, no arc suppression coil.
The content of the invention
There is current earthing wire-selecting and can not accurately select it is an object of the invention to solving above-mentioned prior art and sentence, it is many and extensive
Multiple is by manually trying to draw the problem of choosing is sentenced to sentence method there is provided a kind of automatic choosing of distribution singlephase earth fault circuit.
The technical solution adopted for the present invention to solve the technical problems is：A kind of distribution singlephase earth fault circuit is selected automatically
Sentence method, including be disposed in circuit neutral line current protection device, busbar grounding recoil simulator and the tune for being disposed in main website of plant stand
Backstage is spent, circuit neutral line current protection device and busbar grounding recoil simulator are connected with scheduling background communication,
Step one：Wait circuit neutral line current protection device to act and send singlephase earth fault signal to dispatching backstage；
Step 2：Scheduling backstage determines whether to carry out ground connection involution, if transient fault is tied after then directly making a record
Execution step one is redirected after beam current procedures, if permanent fault then performs step 3；
Step 3：Examination drawing is carried out by regulation and control person, records after permanent fault is handled and redirects if route selection examination pulls into work(
Step one is performed, sequentially table carries out examination drawing by regulation and control person if route selection examination drawing is unsuccessful.
This programme is based on the integrated application to the KV zero-sequence current protection of plant stand 10 and scheduling station automation.
During present invention work：First, when singlephase earth fault occurs for system, faulty line sends zero-sequence current protection alarm
Actuating signal, and scheduling station is uploaded to for signal with " so-and-so alerts line zero-sequence current protection ".2nd, scheduling station is in signal
Reception state, when receiving " so-and-so line zero-sequence current protection alarm ", and is received " the busbar grounding signal " at the station, then system is jumped out
The word dialog box of " so-and-so 110kV stood so-and-so line ground connection, and request examination is drawn ", dialog box, which is clicked on, to be confirmed, if instantaneity
Failure, then after " so-and-so line zero-sequence current protection alarm " blackout, dialog box disappears immediately.3rd, scheduling person on duty according to
System prompt, carries out examination drawing, confirms faulty line.After confirmation, the follow-up process for installing singlephase earth fault processing is carried out accordingly
Processing.
Preferably, in the step one, only when zero-sequence current reaches setting valve, circuit neutral line current protection dress
Transmission singlephase earth fault signal is put to backstage is dispatched, to determine faulty line；
Wherein, the setting valve I of zero-sequence currentsetObtained by following calculation：
Iset=Krel×ICapacitance current
ICapacitance currentFor the capacitance current on outlet nose road on same bus；
KrelBe safety factor when any one go out line length more than or equal to 5 km when, safety factor takes 1.6~2；When appoint
Meaning one go out line length more than or equal to 3 kms and less than 5 km when, safety factor takes 2 or so；Go out line length when any one small
When 3 km, safety factor takes 2~3.It is applied to neutral point in zero-sequence current protection calculation principle in the present invention not straight
Earthed system (mesolow distribution) is connect, the protection to circuit is not carried out directly.Its major significance is single-phase in system generation
During earth fault, for distinguishing faulty line (zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).The present invention
Disclosed in safety factor taken into full account line length, and feedback data, by presumption give detailed safety factor, can
Ensure to distinguish faulty line (zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).
Preferably, suitable for the 10kV circuit zero-sequence currents of earth fault line selection, and this distribution singlephase earth fault line
Automatically select to sentence in method and the sensitivity that all circuit neutral line current protection devices are acted is verified in road.
Preferably, under system normal operating mode, any one 10kV outlet failure, circuit neutral line current protection dress
Put with enough responds, use sensitivity coefficient KsenWeighed, sensitivity coefficient KsenIt is then qualified, K more than setting valuesen
Calculation be：
Preferably, when the capacitance current sum that the circuit connects all outlets on bus is more than 60 ampere-hours, it is sensitive
The setting value of coefficient is at least above equal to 3；When the capacitance current sum that the circuit connects all outlets on bus is more than 40 peaces
Training is less than 60 ampere-hours, and sensitivity coefficient takes 2~3；When the capacitance current sum that the circuit connects all outlets on bus is more than
20 amperes are less than 40 ampere-hours, and sensitivity coefficient takes 1~2.
If preferably, the capacitance current sum that outlet connects all outlets on bus is less than 20, without sensitive
Degree verification.
Preferably, the capacitance current of any outlet on bus：
Wherein S is the sectional area of cable, unit square millimeter；L2 is total cable length, and unit km, L1 is overhead line
Overall length, unit km；Ue is circuit rated line voltage, unit kilovolt.
The present invention substantial effect be：It is applied to neutral point not in the zero-sequence current protection calculation principle of this programme
Solidly grounded system (mesolow distribution), the protection to circuit is not carried out directly.Its major significance is occur list in system
During phase earth fault, for distinguishing faulty line (zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).This hair
Safety factor disclosed in bright has taken into full account line length, and feedback data, and detailed safety factor, energy are given by presumption
It is enough to ensure to distinguish faulty line (zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).
Embodiment
Below by specific embodiment, technical scheme is described in further detail.
Embodiment 1
Automatically method is sentenced in choosing to a kind of distribution singlephase earth fault circuit, including is disposed in the circuit neutral line current protection of plant stand
Device, busbar grounding recoil simulator and the scheduling backstage for being disposed in main website, circuit neutral line current protection device and busbar grounding letter
Number device is connected with scheduling background communication, it is characterised in that：
Step one：Wait circuit neutral line current protection device to act and send singlephase earth fault signal to dispatching backstage；
Step 2：Scheduling backstage determines whether to carry out ground connection involution, if transient fault is tied after then directly making a record
Execution step one is redirected after beam current procedures, if permanent fault then performs step 3；
Step 3：Examination drawing is carried out by regulation and control person, records after permanent fault is handled and redirects if route selection examination pulls into work(
Step one is performed, sequentially table carries out examination drawing by regulation and control person if route selection examination drawing is unsuccessful.
In the step one, only when zero-sequence current reaches setting valve, circuit neutral line current protection device sends single
Phase earth-fault signal is to backstage is dispatched, to determine faulty line；
Wherein, the setting valve I of zero-sequence currentsetObtained by following calculation：
Iset=Krel×ICapacitance current
ICapacitance currentFor the capacitance current on outlet nose road on same bus；
KrelBe safety factor when any one go out line length more than or equal to 5 km when, safety factor takes 1.6~2；When appoint
Meaning one go out line length more than or equal to 3 kms and less than 5 km when, safety factor takes 2 or so；Go out line length when any one small
When 3 km, safety factor takes 2~3.Suitable for the 10kV circuit zero-sequence currents of earth fault line selection, and this distribution is single-phase connects
Earth fault circuit selects to sentence in method and the sensitivity that all circuit neutral line current protection devices are acted is verified automatically.
Under system normal operating mode, any one 10kV outlet failure, circuit neutral line current protection device has foot
Enough responds, use sensitivity coefficient KsenWeighed, sensitivity coefficient KsenIt is then qualified, K more than setting valuesenCalculating side
Formula is：
When the capacitance current sum that the circuit connects all outlets on bus is more than 60 ampere-hours, the setting of sensitivity coefficient
Value is at least above equal to 3；It is less than 60 peaces when the capacitance current sum that the circuit connects all outlets on bus is more than 40 amperes
During training, sensitivity coefficient takes 2~3；When the capacitance current sum that the circuit connects all outlets on bus is less than more than 20 amperes
40 ampere-hours, sensitivity coefficient takes 1~2.
If the capacitance current sum that outlet connects all outlets on bus is less than 20, without sensitivity check.
The capacitance current of any outlet on bus：
Wherein S is the sectional area of cable, unit square millimeter；L2 is total cable length, and unit km, L1 is overhead line
Overall length, unit km；Ue is circuit rated line voltage, unit kilovolt.
When the present embodiment works：First, when singlephase earth fault occurs for system, faulty line sends zero-sequence current protection announcement
Alert actuating signal, and scheduling station is uploaded to for signal with " so-and-so alerts line zero-sequence current protection ".2nd, scheduling station is in letter
Number reception state, when receiving " so-and-so line zero-sequence current protection alarm ", and receives " the busbar grounding signal " at the station, then system is jumped
Go out the word dialog box of " so-and-so 110kV stood so-and-so line ground connection, and request examination is drawn ", dialog box, which is clicked on, to be confirmed, if instantaneous
Property failure, then after " so-and-so line zero-sequence current protection alarm " blackout, dialog box disappears immediately.3rd, person on duty's root is dispatched
According to system prompt, examination drawing is carried out, faulty line is confirmed.After confirmation, the follow-up process for installing singlephase earth fault processing carries out phase
It should handle.
In the zero-sequence current protection calculation principle of this programme be applied to neutral point not solidly grounded system (mesolow is matched somebody with somebody
Net), the protection to circuit is not carried out directly.Its major significance is when singlephase earth fault occurs for system, for distinguishing
Faulty line (zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).Safety factor is abundant disclosed in the present invention
Line length, and feedback data are considered, detailed safety factor is given by presumption, ensure that differentiation faulty line
(zero-sequenceprotection action) and non-fault line (zero-sequenceprotection is failure to actuate).
Embodiment described above is a kind of preferably scheme of the present invention, not makees any formal to the present invention
Limitation, also has other variants and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (7)
1. method is sentenced in choosing to a kind of distribution singlephase earth fault circuit automatically, including is disposed in the circuit neutral line current protection dress of plant stand
Put, busbar grounding recoil simulator and the scheduling backstage for being disposed in main website, circuit neutral line current protection device and busbar grounding signal
Device is connected with scheduling background communication, it is characterised in that：
Step one：Wait circuit neutral line current protection device to act and send singlephase earth fault signal to dispatching backstage；
Step 2：Scheduling backstage determines whether to carry out ground connection involution, if transient fault terminates to work as after then directly making a record
Execution step one is redirected after preceding step, if permanent fault then performs step 3；
Step 3：Examination drawing is carried out by regulation and control person, is recorded if route selection examination pulls into work(and execution is redirected after permanent fault is handled
Step one, by regulation and control person, sequentially table carries out examination drawing if route selection examination drawing is unsuccessful.
2. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 1 automatically, it is characterised in that：In the step
In rapid one, only when zero-sequence current reaches setting valve, circuit neutral line current protection device sends singlephase earth fault signal extremely
Backstage is dispatched, to determine faulty line；
Wherein, the setting valve I of zero-sequence currentsetObtained by following calculation：
Iset=Krel×ICapacitance current
ICapacitance currentFor the capacitance current on outlet nose road on same bus；
KrelBe safety factor when any one go out line length more than or equal to 5 km when, safety factor takes 1.6~2；When any one
Bar go out line length more than or equal to 3 kms and less than 5 km when, safety factor takes 2 or so；Go out line length when any one less than 3
During km, safety factor takes 2~3.
3. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 1 automatically, it is characterised in that：Suitable for connecing
The 10kV circuit zero-sequence currents of earth fault route selection, and this distribution singlephase earth fault circuit automatically sentence in method to all circuits by choosing
The sensitivity of neutral line current protection device action is verified.
4. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 3 automatically, it is characterised in that：In system just
Under the normal method of operation, any one 10kV outlet failure, circuit neutral line current protection device has enough responds, with spirit
Quick COEFFICIENT KsenWeighed, sensitivity coefficient KsenIt is then qualified, K more than setting valuesenCalculation be：
5. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 4 automatically, it is characterised in that：When the circuit
The capacitance current sum of all outlets on connect bus is more than 60 ampere-hours, and the setting value of sensitivity coefficient is at least above equal to 3；
It is less than 60 ampere-hours when the capacitance current sum that the circuit connects all outlets on bus is more than 40 amperes, sensitivity coefficient takes 2
~3；It is less than 40 ampere-hours, sensitivity coefficient when the capacitance current sum that the circuit connects all outlets on bus is more than 20 amperes
Take 1~2.
6. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 4 automatically, it is characterised in that：If outlet
The capacitance current sum of all outlets on connect bus is less than 20, then without sensitivity check.
7. method is sentenced in choosing to distribution singlephase earth fault circuit according to claim 1 automatically, it is characterised in that：
The capacitance current of any outlet on bus：
Wherein S is the sectional area of cable, unit square millimeter；L2 is total cable length, and unit km, L1 is overhead line overall length,
Unit km；Ue is circuit rated line voltage, unit kilovolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710130200.2A CN107167701A (en) | 2017-03-06 | 2017-03-06 | Automatically method is sentenced in choosing to distribution singlephase earth fault circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710130200.2A CN107167701A (en) | 2017-03-06 | 2017-03-06 | Automatically method is sentenced in choosing to distribution singlephase earth fault circuit |
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| CN107167701A true CN107167701A (en) | 2017-09-15 |
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| CN201710130200.2A Pending CN107167701A (en) | 2017-03-06 | 2017-03-06 | Automatically method is sentenced in choosing to distribution singlephase earth fault circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788933A (en) * | 2012-09-25 | 2012-11-21 | 河北省电力公司 | Method for utilizing automatic switch-out controller to search power grid low-current single-phase ground fault |
| CN104898018A (en) * | 2015-05-05 | 2015-09-09 | 国家电网公司 | Automatic pull trial detection and control device for single-phase earth fault of power distribution network |
| CN105119253A (en) * | 2015-09-14 | 2015-12-02 | 国家电网公司 | Demarcation switching zero-sequence current protection setting value calculation method |
| CN105629128A (en) * | 2016-01-15 | 2016-06-01 | 国网河北省电力公司电力科学研究院 | Device and searching method for searching power grid undercurrent single-phase earth fault |
| CN107329035A (en) * | 2017-07-31 | 2017-11-07 | 国电南瑞科技股份有限公司 | A kind of quick examination pulling method of automatic dispatching system small current ground connection and system |
-
2017
- 2017-03-06 CN CN201710130200.2A patent/CN107167701A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788933A (en) * | 2012-09-25 | 2012-11-21 | 河北省电力公司 | Method for utilizing automatic switch-out controller to search power grid low-current single-phase ground fault |
| CN104898018A (en) * | 2015-05-05 | 2015-09-09 | 国家电网公司 | Automatic pull trial detection and control device for single-phase earth fault of power distribution network |
| CN105119253A (en) * | 2015-09-14 | 2015-12-02 | 国家电网公司 | Demarcation switching zero-sequence current protection setting value calculation method |
| CN105629128A (en) * | 2016-01-15 | 2016-06-01 | 国网河北省电力公司电力科学研究院 | Device and searching method for searching power grid undercurrent single-phase earth fault |
| CN107329035A (en) * | 2017-07-31 | 2017-11-07 | 国电南瑞科技股份有限公司 | A kind of quick examination pulling method of automatic dispatching system small current ground connection and system |
Non-Patent Citations (1)
| Title |
|---|
| 钟新华: "配电网电容电流估算公式的修正", 《电力建设》 * |
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Application publication date: 20170915 |