CN106980067A - The broken string recognition methods compared based on residual voltage differential values - Google Patents

The broken string recognition methods compared based on residual voltage differential values Download PDF

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Publication number
CN106980067A
CN106980067A CN201710231943.9A CN201710231943A CN106980067A CN 106980067 A CN106980067 A CN 106980067A CN 201710231943 A CN201710231943 A CN 201710231943A CN 106980067 A CN106980067 A CN 106980067A
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phase
voltage
residual voltage
bus
outlet
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CN201710231943.9A
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CN106980067B (en
Inventor
徐铭铭
王鹏
冯光
马建伟
牛荣泽
徐恒博
李宗峰
张建宾
孙芊
王倩
王文博
贺翔
王磊
周宁
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a kind of broken string recognition methods compared based on residual voltage differential values, by gathering the three-phase voltage of bus and the three-phase current of every outlet in transformer station, and the Sudden Changing Rate and the amplitude of each outlet three-phase current that three-phase voltage amplitude calculated based on this, calculate bus residual voltage and power distribution network high voltage side of transformer residual voltage, the residual voltage differential values of each bar outlet are calculated respectively, compare the size of all outlet residual voltage differential values, maximum of which is exactly faulty line；The present invention only uses substation information, is not influenceed by neutral grounding in distribution power network and broken position, and can be broken phase to phase fault and broken string application of load side joint earth fault with reliable recognition, effectively improve the reliability that power distribution network is powered.

Description

The broken string recognition methods compared based on residual voltage differential values
Technical field
The present invention relates to a kind of power distribution network relay protecting method, specially power distribution network break after residual voltage differential values The recognition methods compared.
Background technology
In recent years because medium voltage distribution network disconnection fault is not handled in time and causes have hair during human casualty accident It is raw, heavy losses are caused to society, while bringing huge pressure from public opinion to power supply department.There are 4 forms in the broken string of power distribution network, Earth-free, the broken string mains side that respectively breaks is grounded, broken string load side ground connection and broken string both sides are all grounded.For broken string power supply Side joint earth fault and broken string both sides all earth fault are solved by traditional Small Electric Current Earthing And Routing Device, but it is earth-free to break And broken string load side earth fault does not obtain enough attention also, studies less.The propulsion built with intelligent grid, in The development of state's power distribution network receives increasing attention.National Energy Board issues for 2015《Distribution network construction transformation action Plan (2015-2020)》, file points out that the following fund for distribution network construction is no less than 2 trillion yuans, it may be said that power distribution network Development welcome a unprecedented opportunities.Power distribution information acquisition system is provided with based on current distribution transformer, can be with The information of load side is obtained, so to the facility for recognizing that broken string is earth-free and the load side earth fault that breaks is provided, the present invention Patent is namely based on substation bus bar residual voltage and the differential values of distribution transformer side high-pressure side residual voltage realize broken string not Ground connection and the identification of broken string load side earth fault.
With the growth of national economy, people increasingly pay attention to the construction of power distribution network.In order to reduce human casualty accident, have The quick identification of necessity research distribution single-phase fault and treatment technology.Due to power distribution network broad covered area, in order to exploitativeness, Study extremely urgent with treatment technology based on the single-phase fault identification under existing distribution net equipment configuration condition.Patented technology of the present invention New method is recognized merely with the broken string of substation information.
The content of the invention
Patent of the present invention mainly solves earth-free and broken string load side earth fault identification of breaking.When generation is broken not Fault signature after earth fault and broken string load side earth fault is to have one mutually to raise in bus three-phase voltage, two-phase in addition Reduction, the voltage rise phase current of faulty line is changed into 0, for faulty line, bus residual voltage and distribution transformer high pressure The differential values of side residual voltage are larger, are 1.5 times of phase voltage, for perfecting circuit, bus residual voltage is substantially equal to distribution High voltage side of transformer residual voltage.Based on this construction broken string identical criterion.
To realize above-mentioned target, the present invention is adopted the following technical scheme that：
Step one：The three-phase voltage of bus and the three-phase current of every outlet are gathered in transformer station.
Step 2：The power frequency amplitude of bus three-phase voltage is extracted by fft algorithm.
Step 3：The Sudden Changing Rate of bus three-phase voltage amplitude is calculated by formula (1).
WhereinThe Sudden Changing Rate of phase voltage amplitude is represented,For the amplitude of phase voltage after failure,Represent phase before failure The amplitude of voltage.
The Sudden Changing Rate of phase voltage amplitude is more than 0, represents phase voltage rise, and the Sudden Changing Rate of phase voltage amplitude is less than 0, represents drop It is low.Mutually raised if it is judged that bus three-phase electricity is pressed with one, two-phase is reduced in addition, then step 4 is carried out, if not this feelings Condition, then return to step one and recalculate.
Step 4：The amplitude of each outlet three-phase current is proposed by fft algorithm, if voltage is raised in any certain outlet The electric current of phase is 0, then carries out step 5, if the voltage rise phase current of all outlets is not 0, is opened again from step one Begin to calculate.
Step 5：Bus residual voltage and power distribution network high voltage side of transformer residual voltage are calculated by formula (2) respectively.
Wherein uBA、uBB、uBCRepresent bus A, B, C three-phase voltage, uB0Represent bus residual voltage, uTA、uTB、uTCExpression is matched somebody with somebody Network transformer high-pressure side A, B, C three-phase voltage, uT0Represent power distribution network high voltage side of transformer residual voltage.
Step 6：The residual voltage differential values of each bar outlet are calculated respectively, and specific algorithm is to be subtracted with the residual voltage of bus Remove to upload to any one on high-tension side residual voltage of distribution transforming of the outlet of transformer station by power distribution information acquisition system.
Step 7：Compare the size of all outlet residual voltage differential values, maximum of which is exactly faulty line.
The beneficial effects of the invention are as follows：The broken string recognition methods that the present invention is compared based on residual voltage differential values not by The influence of neutral grounding in distribution power network and broken position, can be broken phase to phase fault and broken string application of load with reliable recognition Side joint earth fault.
Brief description of the drawings
Fig. 1 is 10kV power distribution network simulation models；
The residual voltage differential values of 4 outlets when Fig. 2 is breaks earth-free；
Fig. 3 is 4 outlet residual voltage differential values when with breaking application of load side joint.
Embodiment
Fig. 1 is the 10kV power distribution network simulation model schematic diagrames set up based on PSCAD；In the model, 35kV transformer stations have two Back into line, the 10kV systems allotted by two main transformers are single busbar form；Bus carries each in 4 main feeders, outlet The numbering of section is as shown in FIG..Wherein, section 1,3,5,10 is cable, and section 2,9,11,12,13 is aerial insulated wire, area Section 4,6,7,8,14 is overhead bare conductor.Arc suppression coil becomes on neutral point mounted in used.When switching K openings, system is neutral point Isolated neutral system；It is then arc suppression coil earthing system to switch K closures, and overcompensation degree is taken as 10%.
Each section length is respectively：L1=5.1km, L2=4km, L3=3.8km, L4=7.5km, L5=4km, L6= 10km, L7=0.1km, L8=3km, L9=4km, L10=3.2km, L11=10km, L12=5km, L13=3km, L14= 7.5km。
Cable data is：Positive sequence resistance r1=0.157 Ω/km, positive sequence induction reactance x1=0.076 Ω/km, positive sequence accommodates b1= 132×10-6S/km；Zero sequence resistance r0=0.307 Ω/km, zero sequence induction reactance x0=0.304 Ω/km, zero sequence accommodates b0=110 × 10-6S/km。
Aerial insulated wire parameter is：Positive sequence resistance r1=0.27 Ω/km, positive sequence induction reactance x1=0.352 Ω/km, positive sequence is accommodated b1=3.178 × 10-6S/km；Zero sequence resistance r0=0.42 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodates b0= 0.676×10-6S/km。
Bare conductor parameter is in section 7,8：Positive sequence resistance r1=0.91 Ω/km, positive sequence induction reactance x1=0.403 Ω/km, just Sequence accommodates b1=2.729 × 10-6S/km；Zero sequence resistance r0=1.06 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence is accommodated b0=0.672 × 10-6S/km。
Other section bare conductor parameters are：Positive sequence resistance r1=0.63 Ω/km, positive sequence induction reactance x1=0.392 Ω/km, positive sequence Accommodate b1=2.807 × 10-6S/km；Zero sequence resistance r0=0.78 Ω/km, zero sequence induction reactance x0=3.593 Ω/km, zero sequence accommodates b0 =0.683 × 10-6S/km。
Two main transformer parameters are respectively：Capacity SN=2MVA, short circuit loss Pk=20.586kW, short-circuit voltage percentage Uk%=6.37%, open circuit loss P0=2.88kW, no-load current percentage I0%=0.61%；Capacity SN=2MVA, short circuit is damaged Consume Pk=20.591kW, short-circuit voltage percentage Uk%=6.35%, open circuit loss P0=2.83kW, no-load current percentage I0%=0.62%.
Make each distribution transformer and institute's jointing numbering unanimously, then their capacity is respectively：S5N=50kVA, S7N= 500kVA, S8N=200kVA, S9N=1MVA, S10N=100kVA, S12N=1MVA, S13N=400kVA, S14N=630kVA.For For the sake of simplicity, it is the 80% of transformer capacity that each distribution transformer institute on-load is unified, power factor is 0.85.
Fig. 2 is the waveform for setting the emulation of single-phase wire break phase to phase fault to obtain in the end of isolated neutral system section 1.Can be with Find out, the residual voltage differential values of circuit 1 are maximum, it is possible to which true timing circuit 1 there occurs disconnection fault.
Fig. 3 is that arc suppression coil earthing system sets single-phase wire break application of load side joint earth fault to emulate in the head end of section 4 The waveform arrived.It can be seen that, it can be seen that the residual voltage differential values of circuit 4 are maximum, it is possible to which true timing circuit 4 occurs Disconnection fault.
To sum up analysis is not it can be seen that the broken string recognition methods compared based on residual voltage differential values is by power distribution network Property point earthing mode and broken position influence, can with reliable recognition break phase to phase fault and broken string application of load side joint it is former Barrier.

Claims (5)

  1. The recognition methods 1. a kind of power distribution network breaks, it is characterised in that based on substation bus bar residual voltage and distribution transformer side The differential values of high-pressure side residual voltage are identified, and only use substation information, not by neutral grounding in distribution power network and disconnected The influence of line position, can recognize broken string phase to phase fault and broken string load side earth fault.
  2. The recognition methods 2. power distribution network according to claim 1 breaks, it is characterised in that the recognition methods further comprises Following steps：
    Step one：The three-phase voltage of bus and the three-phase current of every outlet are gathered in transformer station；
    Step 2：The power frequency amplitude of bus three-phase voltage is extracted by fft algorithm；
    Step 3：Calculate the Sudden Changing Rate of bus three-phase voltage amplitude；Mutually raised if it is judged that bus three-phase electricity is pressed with one, in addition Two-phase is reduced, then carries out step 4, recalculated if it is not the case, then returning to step one；
    Step 4：The amplitude of each outlet three-phase current is proposed by fft algorithm, if voltage rise phase in any certain outlet Electric current is 0, then carries out step 5, if the voltage rise phase current of all outlets is not 0, is counted at the beginning from step again Calculate；
    Step 5：Calculate bus residual voltage and power distribution network high voltage side of transformer residual voltage；
    Step 6：The residual voltage differential values of each bar outlet are calculated respectively；
    Step 7：Compare the size of all outlet residual voltage differential values, maximum of which is exactly faulty line.
  3. The recognition methods 3. power distribution network according to claim 2 breaks, it is characterised in that bus three-phase is calculated by formula (1) The Sudden Changing Rate of voltage magnitude；
    WhereinThe Sudden Changing Rate of phase voltage amplitude is represented,For the amplitude of phase voltage after failure,Represent phase voltage before failure Amplitude；The Sudden Changing Rate of phase voltage amplitude is more than 0, represents phase voltage rise, and the Sudden Changing Rate of phase voltage amplitude is less than 0, represents drop It is low.
  4. The recognition methods 4. power distribution network according to claim 2 breaks, it is characterised in that bus zero sequence is calculated by formula (2) Voltage and power distribution network high voltage side of transformer residual voltage：
    u0=uA+uB+uC (2)。
  5. The recognition methods 5. power distribution network according to claim 2 breaks, it is characterised in that in the step 6, calculate respectively The residual voltage differential values of each bar outlet, specific algorithm is to be subtracted with the residual voltage of bus by power distribution information acquisition system Pass to any one on high-tension side residual voltage of distribution transforming of the outlet of transformer station.
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN108459233A (en) * 2018-03-27 2018-08-28 深圳供电局有限公司 Equivalent circuit for two-phase disconnection fault of main transformer and identification method
CN110676822A (en) * 2019-11-28 2020-01-10 国网江苏省电力有限公司镇江供电分公司 Line disconnection relay protection method for comparing voltage difference between two sides of line and application
CN110880744A (en) * 2019-12-09 2020-03-13 国网江苏省电力有限公司镇江供电分公司 Line disconnection protection method for comparing voltage amplitude difference of two side lines of line
CN112540259A (en) * 2020-11-05 2021-03-23 威胜电气有限公司 Distribution network disconnection fault identification method and system suitable for intelligent power distribution terminal

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108459233A (en) * 2018-03-27 2018-08-28 深圳供电局有限公司 Equivalent circuit for two-phase disconnection fault of main transformer and identification method
CN108459233B (en) * 2018-03-27 2024-01-19 深圳供电局有限公司 Equivalent circuit of main transformer high-voltage two-phase disconnection fault and identification method
CN110676822A (en) * 2019-11-28 2020-01-10 国网江苏省电力有限公司镇江供电分公司 Line disconnection relay protection method for comparing voltage difference between two sides of line and application
CN110676822B (en) * 2019-11-28 2021-06-29 国网江苏省电力有限公司镇江供电分公司 Line disconnection relay protection method for comparing voltage difference between two sides of line and application
CN110880744A (en) * 2019-12-09 2020-03-13 国网江苏省电力有限公司镇江供电分公司 Line disconnection protection method for comparing voltage amplitude difference of two side lines of line
CN112540259A (en) * 2020-11-05 2021-03-23 威胜电气有限公司 Distribution network disconnection fault identification method and system suitable for intelligent power distribution terminal

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