CN106980067B - 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 PDFInfo
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- CN106980067B CN106980067B CN201710231943.9A CN201710231943A CN106980067B CN 106980067 B CN106980067 B CN 106980067B CN 201710231943 A CN201710231943 A CN 201710231943A CN 106980067 B CN106980067 B CN 106980067B
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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
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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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- 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 acquiring the three-phase voltage of bus and the three-phase current of every outlet in substation, and the Sudden Changing Rate of three-phase voltage amplitude and the amplitude of each outlet three-phase current are calculated based on this, calculate bus residual voltage and power distribution network high voltage side of transformer residual voltage, calculate separately the residual voltage differential values of each outlet, compare the size of all outlet residual voltage differential values, maximum is exactly faulty line；The present invention only uses substation information, is not influenced by neutral grounding in distribution power network and broken position, can flank earth fault with reliable recognition broken string phase to phase fault and broken string application of load, effectively improve the reliability of power distribution network power supply.
Description
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 technique
Lead to human casualty accident Shi Youfa since medium voltage distribution network disconnection fault is not handled in time in recent years
It is raw, heavy losses are caused to society, while bringing huge pressure from public opinion to power supply department.The broken string of power distribution network there are 4 forms,
Earth-free, the broken string source side that respectively breaks is grounded, broken string load side ground connection and broken string two sides are all grounded.For the power supply that breaks
It flanks earth fault and the two sides all ground fault that breaks is solved by traditional Small Electric Current Earthing And Routing Device, but it is earth-free to break
And broken string load side ground fault obtains enough attention not yet, studies less.With smart grid build propulsion, in
The development of state's power distribution network receives more and more attention.National Energy Board's publication in 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 installed based on current distribution transformer, it can be with
The information of load side is obtained, so to the convenience for identifying that broken string is earth-free and the load side ground fault that breaks provides, 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
The identification of ground connection and broken string load side ground 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 processing technique.Due to power distribution network broad covered area, in order to exploitativeness,
It studies extremely urgent with processing technique based on the single-phase fault identification under existing distribution net equipment configuration condition.The invention patent technology
New method is identified merely with the broken string of substation information.
Summary of the invention
The invention patent mainly solves earth-free and broken string load side ground fault identification of breaking.When generation is broken not
Fault signature after ground fault and broken string load side ground fault is to have a Xiang Shenggao in bus three-phase voltage, in addition two-phase
It reducing, the voltage of faulty line, which increases phase current, becomes 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 sound circuit, bus residual voltage is substantially equal to distribution
High voltage side of transformer residual voltage.Broken string identical criterion is constructed based on this.
To realize that above-mentioned target, the present invention adopt the following technical scheme that:
Step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of every outlet.
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).
WhereinIndicate the Sudden Changing Rate of phase voltage amplitude,For the amplitude of phase voltage after failure,Phase before expression failure
The amplitude of voltage.
The Sudden Changing Rate of phase voltage amplitude is greater than 0, indicates that phase voltage increases, and the Sudden Changing Rate of phase voltage amplitude indicates drop less than 0
It is low.If it is judged that bus three-phase electricity is pressed with a Xiang Shenggao, in addition two-phase is reduced, then step 4 is carried out, if not this feelings
Condition is then recalculated back to step 1.
Step 4: proposing the amplitude of each outlet three-phase current by fft algorithm, if voltage increases in any certain outlet
The electric current of phase is 0, then carries out step 5, if it is not 0 that the voltage of all outlets, which increases phase current, is opened again from step 1
Begin to calculate.
Step 5: bus residual voltage and power distribution network high voltage side of transformer residual voltage are calculated separately by formula (2).
Wherein uBA、uBB、uBCIndicate bus A, B, C three-phase voltage, uB0Indicate bus residual voltage, uTA、uTB、uTCExpression is matched
Network transformer high-pressure side A, B, C three-phase voltage, uT0Indicate power distribution network high voltage side of transformer residual voltage.
Step 6: calculating separately the residual voltage differential values of each outlet, and specific algorithm is to be subtracted with the residual voltage of bus
Remove any one on high-tension side residual voltage of distribution transforming of the outlet that substation is uploaded to by power distribution information acquisition system.
Step 7: the size of more all outlet residual voltage differential values, maximum are exactly faulty line.
The beneficial effects of the present invention are: the broken string recognition methods compared the present invention is 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
Flank earth fault.
Detailed description of the invention
Fig. 1 is 10kV power distribution network simulation model；
Fig. 2 is the residual voltage differential values of 4 outlets when broken string is earth-free；
Fig. 3 is 4 outlet residual voltage differential values when broken string application of load flanks ground.
Specific embodiment
Fig. 1 is the 10kV power distribution network simulation model schematic diagram established based on PSCAD；In the model, 35kV substation has two
It is single busbar form by the 10kV system that two main transformers are allotted back into line；Bus has 4 main feeders, each in outlet
The number of section is as shown in the figure.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 is on change neutral point used.When switch K is opened, system is neutral point
Isolated neutral system；Switch K closure is then arc suppression coil earthing system, and overcompensation degree is taken as 10%.
Each section length is respectively as follows: 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 are as follows: positive sequence resistance r1=0.157 Ω/km, positive sequence induction reactance x1=0.076 Ω/km, positive sequence accommodate b1=
132×10-6S/km；Zero sequence resistance r0=0.307 Ω/km, zero sequence induction reactance x0=0.304 Ω/km, zero sequence accommodate b0=110 ×
10-6S/km。
Aerial insulated wire parameter are as follows: positive sequence resistance r1=0.27 Ω/km, positive sequence induction reactance x1=0.352 Ω/km, positive sequence accommodate
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 accommodate b0=
0.676×10-6S/km。
Bare conductor parameter in section 7,8 are as follows: 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 accommodate
b0=0.672 × 10-6S/km。
Other section bare conductor parameters are as follows: 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 accommodate b0
=0.683 × 10-6S/km。
Two main transformer parameters are respectively as follows: capacity SN=2MVA, short circuit loss Pk=20.586kW, short-circuit voltage percentage
Uk%=6.37%, no-load loss P0=2.88kW, no-load current percentage I0%=0.61%；Capacity SN=2MVA, short circuit damage
Consume Pk=20.591kW, short-circuit voltage percentage Uk%=6.35%, no-load loss P0=2.83kW, no-load current percentage
I0%=0.62%.
Each distribution transformer and institute's jointing is enabled to number consistent, then their capacity is respectively as follows: S5N=50kVA, S7N=
500kVA, S8N=200kVA, S9N=1MVA, S10N=100kVA, S12N=1MVA, S13N=400kVA, S14N=630kVA.For
For the sake of simplicity, each distribution transformer institute on-load is unified for the 80% of transformer capacity, power factor 0.85.
Fig. 2 is that the waveform that single-phase wire break phase to phase fault emulates is arranged in the end of isolated neutral system section 1.It can be with
Find out, the residual voltage differential values of route 1 are maximum, it is possible to which disconnection fault has occurred in true timing circuit 1.
Fig. 3 flanks earth fault in the head end setting single-phase wire break application of load of section 4 for arc suppression coil earthing system and emulates
The waveform arrived.It can be seen that, it can be seen that the residual voltage differential values of route 4 are maximum, it is possible to which true timing circuit 4 occurs
Disconnection fault.
To sum up analysis it can be seen that the broken string recognition methods compared based on residual voltage differential values not 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 flank ground therefore
Barrier.
Claims (3)
- The recognition methods 1. a kind of power distribution network breaks, which is characterized in that be based on substation bus bar residual voltage and distribution transformer side The differential values of high-pressure side residual voltage are identified, substation information is only used, and not by neutral grounding in distribution power network and are broken The influence of line position can identify broken string phase to phase fault and broken string load side ground fault；The recognition methods is further Include the following steps:Step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of every outlet；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；If it is judged that bus three-phase electricity is pressed with a Xiang Shenggao, in addition Two-phase reduces, then step 4 is carried out, if it is not the case, then recalculating back to step 1；Step 4: proposing the amplitude of each outlet three-phase current by fft algorithm, if voltage increases phase in any certain outlet Electric current is 0, then carries out step 5, if it is not 0 that the voltage of all outlets, which increases phase current, is counted at the beginning from step again It calculates；Step 5: bus residual voltage and power distribution network high voltage side of transformer residual voltage are calculated；Step 6: the residual voltage differential values of each outlet are calculated separately；Step 7: the size of more all outlet residual voltage differential values, maximum are exactly faulty line；Pass through formula (1) Calculate the Sudden Changing Rate of bus three-phase voltage amplitude；WhereinIndicate the Sudden Changing Rate of phase voltage amplitude,For the amplitude of phase voltage after failure,Phase voltage before expression failure Amplitude；The Sudden Changing Rate of phase voltage amplitude is greater than 0, indicates that phase voltage increases, and the Sudden Changing Rate of phase voltage amplitude indicates drop less than 0 It is low.
- The recognition methods 2. power distribution network according to claim 1 breaks, which is characterized in that calculate bus zero sequence by formula (2) Voltage and power distribution network high voltage side of transformer residual voltage:u0=uA+uB+uC(2)；Wherein, uA、uB、uCIndicate A, B, C three-phase voltage, u0Indicate residual voltage.
- The recognition methods 3. power distribution network according to claim 1 breaks, which is characterized in that in the step 6, calculate separately The residual voltage differential values of each outlet, specific algorithm are to be subtracted to adopt by power distribution network transformer information with the residual voltage of bus Collecting system uploads to the residual voltage of any one station power distribution net high voltage side of transformer of the outlet of substation.
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| 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 |
| 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 |
| CN110880744B (en) * | 2019-12-09 | 2021-02-19 | 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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Inventor after: Xu Mingming Inventor after: Wang Qian Inventor after: Wang Wenbo Inventor after: He Xiang Inventor after: Wang Lei Inventor after: Zhou Ning Inventor after: Pan Yong Inventor after: Wang Peng Inventor after: Feng Guang Inventor after: Ma Jianwei Inventor after: Niu Rongze Inventor after: Xu Hengbo Inventor after: Li Zongfeng Inventor after: Zhang Jianbin Inventor after: Sun Qian Inventor before: Xu Mingming Inventor before: Wang Qian Inventor before: Wang Wenbo Inventor before: He Xiang Inventor before: Wang Lei Inventor before: Zhou Ning Inventor before: Wang Peng Inventor before: Feng Guang Inventor before: Ma Jianwei Inventor before: Niu Rongze Inventor before: Xu Hengbo Inventor before: Li Zongfeng Inventor before: Zhang Jianbin Inventor before: Sun Qian |
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