CN107192883A - A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method - Google Patents
A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method Download PDFInfo
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- CN107192883A CN107192883A CN201710360981.4A CN201710360981A CN107192883A CN 107192883 A CN107192883 A CN 107192883A CN 201710360981 A CN201710360981 A CN 201710360981A CN 107192883 A CN107192883 A CN 107192883A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention provides a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method, acted on using the overcompensation of arc suppression coil, with reference to the advantage of transient signal, propose it is a kind of using bus transient zero-sequence voltage and faulty line and it is any perfect feeder line transient zero-sequence current and calculate obtain trouble point transient zero-sequence current, so as to calculate the method for transition resistance resistance.Compared to the prior art, present invention only requires system residual voltage and each outlet zero sequence current signal, it is not necessary to three-phase voltage and three-phase current signal, facilitates existing low-current ground fault line selection device to realize, and be difficult by TV/TA progress of disease error and unbalanced influence.This technology is for helping operations staff to carry out accurate network analysis, having extensive actual application value, the theory value significant and important to improving the performance of protection device reply transition resistance to high resistance earthing fault progress route selection, positioning, ranging.
Description
Technical field
The present invention relates to distribution network failure detection field, and in particular to a kind of resonant earthed system high resistance earthing fault transition
Resistance discrimination method.
Background technology
Because medium voltage distribution network region be directly facing user, and single-phase earthing about accounts for the 80% of distribution network failure sum, list
Reliably detection influences notable to phase earth fault on power supply reliability.In China and Continental Europe, most medium voltage distribution networks are using warp
Grounding through arc mode, i.e., so-called resonant earthed system.Failure need not be cut off during singlephase earth fault immediately, is conducive to carrying
High power supply reliability, but due to the reason such as fault current is faint, identification earth fault line has larger difficulty.In recent years, Europe and
The Chinese utilization fault transient electrical quantity developed respectively, the route selection technology such as resistance in neutral point is additional, efficiently solve transition
Earth fault line selection problem when resistance is smaller.
On the other hand, influenceed by natural environment, fixed track usage plan apart from low factor, often occur to lead through non-ideal in power distribution network
The single-phase high-impedance of body, such as wire are fallen in meadow, road.French small current neutral grounding system has more than 12% and connect
Earth fault is high resistance ground, and U.S.'s DianKeYuan (EPRI) statistics shows, the U.S. (three-phase four-wire system multiple spot is directly grounded) power distribution network
The ratio of high resistive fault is 2%~5%.Similar with transmission system, the high resistance earthing fault in power distribution network is due to compared with great transition electricity
The presence of resistance, causes fault current further to reduce (generally A grade), trouble point unstable, calculates accident analysis and complicate.
The presence of transition resistance is calculated to power system fault analysis, protection fixed value adjusting, the action message of protection device
Many adverse effects are brought, the malfunction or tripping of many protection devices are all relevant with transition resistance.Transition resistance characteristic is carried out
Calculate in real time, for helping operations staff to carry out accurate network analysis, carrying out route selection, positioning, ranging to high resistance earthing fault
The performance for tackling transition resistance with extensive actual application value, to raising protection device is significant and important
Theory value.
Resonance stream earthed system high resistance earthing fault detection technique is a study hotspot in recent years, also achieve some into
Really, but high resistance earthing fault resistance identification problem is less takes into account, achievement is also relatively fewer.Paper《Measured based on fault resstance
Small current neutral grounding system guard method》And paper《The fault-line selecting method recognized based on direct-to-ground capacitance and transition resistance》Propose profit
With the phasor relation between three-phase current variable quantity before and after each bar line fault, each line-to-ground conduction current is calculated, and can enter
One step is derived by trouble point transition resistance.The main difficulty that this method faces is that line selection apparatus needs access three-phase current letter
Number and by TV/TA progress of disease error (such as degree of unbalancedness) influence it is larger.
For resonant earthed system, power current itself is without obvious fault feature during high resistance ground, and faulty line and strong
Full line power frequency zero-sequence current and power frequency residual voltage are capacitive constraints relation, it is impossible to recognize trouble point transition resistance.
The content of the invention
It is an object of the invention to provide a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method, utilize
The overcompensation effect of arc suppression coil, with reference to the advantage of transient signal, proposes that one kind utilizes bus transient zero-sequence voltage and fault wire
Road and it is any perfect feeder line transient zero-sequence current calculate obtain trouble point transient zero-sequence current, so as to calculate transition resistance resistance
Method.
The present invention uses following technical scheme：
A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method, comprises the following steps：
Step 1：Online acquisition bus residual voltage, when bus residual voltage amplitude is in Uth1＜ U0f＜ Uth2When it is (general
Uth1=15V, Uth2=90V), then illustrate that high resistance earthing fault occurs for system, low-current ground fault line selection device starts choosing
Be out of order feeder line；
Step 2：Extract fault feeder outlet zero-sequence current, any feeder line that perfects and export zero-sequence current and bus residual voltage
Transient state component be respectively i0n_T、i0i_T(i=1,2 ..., n-1), u0f_T；
Step 3：Fault feeder is calculated respectively and this perfects feeder line and exports transient zero-sequence current to bus transient zero-sequence voltage
Projection coefficient ξn、ξi, formula is：
Step 4：Calculate fault feeder transient state capacitance current
Step 5：Subtract fault feeder transient state capacitance current using fault feeder outlet transient zero-sequence current and calculate and be out of order
Point transient zero-sequence current, i.e.,
Step 6：Calculate trouble point transition resistance resistance R.
Preferably, it is using bus transient zero-sequence voltage and faulty line in step 4, any perfects feeder line transient zero-sequence electricity
Flow and the two calculates in the projection coefficient of bus transient zero-sequence voltage and obtains fault feeder transient state capacitance current, calculation formula
For：
Preferably, it is using bus transient zero-sequence voltage and faulty line in step 5, any perfects feeder line transient zero-sequence electricity
Flow and the two calculates in the projection coefficient of bus transient zero-sequence voltage and obtains trouble point transient zero-sequence current, calculation formula is such as
Under：
Preferably, trouble point transition resistance is bus transient zero-sequence voltage and trouble point transient zero-sequence current in step 6
Ratio, calculation formula is as follows：
Preferably, the trouble point transient zero-sequence current is to utilize bus transient zero-sequence voltage and faulty line transient zero-sequence
Electric current and its bus transient zero-sequence voltage projection coefficient calculate obtain, calculation formula is as follows：
Preferably, the trouble point transition resistance is the ratio of bus transient zero-sequence voltage and trouble point transient zero-sequence current
Value, i.e. trouble point transition resistance are equal to the inverse of faulty line transient zero-sequence current projection coefficient on transient zero-sequence voltage, meter
Calculate formula as follows：
The invention has the advantages that：
Compared to the prior art, present invention only requires system residual voltage and each outlet zero sequence current signal, it is not necessary to three
Phase voltage and three-phase current signal, facilitate existing low-current ground fault line selection device to realize, and be difficult by TV/TA progress of disease errors
With unbalanced influence.This technology is for helping operations staff to carry out accurate network analysis, high resistance earthing fault being selected
Line, positioning, ranging have extensive actual application value, have weight to the performance for improving protection device reply transition resistance
Want meaning and important theory value.
Brief description of the drawings
Fig. 1 is the resonant earthed system high resistance earthing fault transition resistance discrimination method FB(flow block) of embodiment 1.
Fig. 2 is the resonant earthed system high resistance earthing fault transition resistance discrimination method FB(flow block) of embodiment 1.
Fig. 3 is typical distribution circuit emulation model.
Fig. 4 is that busbar voltage when grounding resistance is 1500 Ω high resistance earthing fault, failure feedback occur in system shown in Figure 3
Line outlet electric current, the zero-sequence component contrast for perfecting the outlet of feeder line 1 electric current.
Fig. 5 is that busbar voltage when grounding resistance is 1500 Ω high resistance earthing fault, failure feedback occur in system shown in Figure 3
Line outlet electric current, the transient state component contrast for perfecting the outlet of feeder line 1 electric current.
Fig. 6 is that fault feeder transient state electricity when grounding resistance is 1500 Ω high resistance earthing fault occurs in system shown in Figure 3
Capacitance current, trouble point transient zero-sequence current.
Fig. 7 be system shown in Figure 3 in occur different earth points, the high resistance earthing fault of different faults resistance, not inphase angle
When calculate obtained trouble point transition resistance.
Embodiment
The present invention is specifically described below in conjunction with the accompanying drawings：
With reference to Fig. 1 to Fig. 7, when transition resistance constantly increases, the resonant frequency of system transient modelling process will be from few kilohertz
0 is reduced to, the frequency of slightly super power frequency is further added by.When transition resistance is higher, the resonant frequency of system transient modelling process is close to work
Frequently.Therefore, bus transient zero-sequence voltage is almost identical with trouble point transient zero-sequence voltage, you can utilize bus transient zero-sequence voltage
Instead of trouble point transient zero-sequence voltage.Perfect line outlet transient zero-sequence current for the circuit transient state capacitance current, faulty line
Export transient zero-sequence current and include the circuit transient state capacitance current and trouble point transient zero-sequence current.Trouble point transient zero-sequence current
Proportional to transient zero-sequence voltage, i.e., trouble point transient zero-sequence current is 0 to the quadrature component of transient zero-sequence voltage, so failure
Circuit transient zero-sequence current is to quadrature component that the quadrature component of transient zero-sequence voltage is exactly the line mutual-ground capacitor transient current.
Therefore, the ratio between faulty line and any quadrature component for perfecting circuit transient current be equal to two lines road over the ground distribution capacity it
Than.Can using transient zero-sequence voltage and faulty line and it is any perfect circuit transient zero-sequence current and calculate obtain trouble point transient state
Zero-sequence current, trouble point transition resistance resistance is obtained so as to calculate.
Embodiment 1
A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method, comprises the following steps：
Step 1：Online acquisition bus residual voltage, when bus residual voltage amplitude is in Uth1＜ U0f＜ Uth2When it is (general
Uth1=15V, Uth2=90V), then illustrate that high resistance earthing fault occurs for system, low-current ground fault line selection device is according to mother
Line residual voltage starts, when bus residual voltage value reaches that device starts threshold value, starter, and records bus zero sequence electricity
Pressure, the fault data such as zero sequence current signal, trouble duration, the time of failure in each bar feeder line exit, according to being remembered
The data of record, select faulty line；
Step 2：Extract fault feeder outlet zero-sequence current, any feeder line that perfects and export zero-sequence current and bus residual voltage
Transient state component be respectively i0n_T、i0i_T(i=1,2 ..., n-1), u0f_T；
Step 3：Fault feeder is calculated respectively and this perfects feeder line and exports transient zero-sequence current to bus transient zero-sequence voltage
Projection coefficient ξn、ξi, formula is：
Step 4：Using bus transient zero-sequence voltage and faulty line, it is any perfect feeder line transient zero-sequence current and the two
Calculated in the projection coefficient of bus transient zero-sequence voltage and obtain fault feeder transient state capacitance currentCalculation formula is：
Step 5：Subtract fault feeder transient state capacitance current using fault feeder outlet transient zero-sequence current and calculate and be out of order
Point transient zero-sequence current, i.e.,
Step 6：Trouble point transition resistance resistance R is calculated, trouble point transition resistance is bus transient zero-sequence voltage and failure
The ratio of point transient zero-sequence current, calculation formula is as follows：
Embodiment 2
Projection components of the faulty line transient zero-sequence current on transient zero-sequence voltage can also be approximately considered for trouble point
Transient zero-sequence current, trouble point transition resistance resistance is obtained so as to calculate.
Then resonant earthed system high resistance earthing fault transition resistance discrimination method comprises the following steps：
Step 1：The transient state component for extracting fault feeder outlet zero-sequence current and bus residual voltage is respectively i0n_T、u0f_T；
Step 2：Fault feeder export projection coefficient from transient zero-sequence current to bus transient zero-sequence voltage be ξn；
Step 3：Using bus transient zero-sequence voltage and faulty line transient zero-sequence current and its in bus transient zero-sequence electricity
The projection coefficient of pressure calculates and obtains trouble point transient current, and calculation formula is as follows：
Step 4：Trouble point transition resistance is the ratio of bus transient zero-sequence voltage and trouble point transient zero-sequence current, i.e. event
Barrier point transition resistance is equal to the inverse of faulty line transient zero-sequence current projection coefficient on transient zero-sequence voltage, and calculation formula is such as
Under：
Embodiment 3
Set circuit K2 positions in Fig. 3 to occur 1500 Ω high resistance earthing fault, event is carried out using the method in embodiment 1
Barrier point transition resistance identification：
Step 1：When occurring high resistance earthing fault in circuit, line selection apparatus starts according to bus residual voltage, when bus zero
When sequence voltage value reaches that device starts threshold value, starter selects faulty line, starter record bus residual voltage,
The zero sequence current signal in each bar feeder line exit, as shown in Figure 4；
Step 2：Extract fault feeder outlet zero-sequence current, perfect the outlet zero-sequence current of feeder line 1 and bus residual voltage
Transient state component i0n_T、i01_T、u0f_T, as shown in Figure 5；
Step 3：Calculate fault feeder and this perfects feeder line outlet projection of the transient zero-sequence current to bus transient zero-sequence voltage
Coefficient ξn=0.19, ξ1=0.02；
Step 4：Fault feeder transient state capacitance current is calculated, as shown in Figure 6；
Step 5：Trouble point transient zero-sequence current is calculated, as shown in Figure 6；
Step 6：Trouble point transition resistance resistance R=1495.4 Ω are calculated according to formula, with 1500 Ω set by emulation
Similar, this method is effective.
Embodiment 4
Set circuit K2 positions in Fig. 3 to occur 1500 Ω high resistance earthing fault, event is carried out using the method in embodiment 2
Barrier point transition resistance identification：
Step 1：When occurring high resistance earthing fault in circuit, line selection apparatus starts according to bus residual voltage, when bus zero
When sequence voltage value reaches that device starts threshold value, starter selects faulty line, starter record bus residual voltage,
The zero sequence current signal in fault feeder exit, as shown in Figure 4；
Step 2：The transient state component for extracting fault feeder outlet zero-sequence current and bus residual voltage is respectively i0n_T、u0f_T,
As shown in Figure 5；
Step 3：Calculate fault feeder outlet projection coefficient ξ of the transient zero-sequence current to bus transient zero-sequence voltagen=
0.19；
Step 4：Trouble point transition resistance resistance R=1754.4 Ω are calculated according to formula, with 1500 Ω set by emulation
Similar, this method is effective.
Other different earth points, calculate obtained trouble point during the high resistance earthing fault of different faults resistance, not inphase angle
Transition resistance is as shown in fig. 7, close with the resistance value set by emulation, and provable this method effectively, is not being repeated herein.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention, should also belong to the present invention's
Protection domain.
Claims (6)
1. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method, it is characterised in that comprise the following steps：
Step 1：Online acquisition bus residual voltage, when bus residual voltage amplitude is in Uth1＜ U0f＜ Uth2When, then explanation is
High resistance earthing fault occurs for system, and low-current ground fault line selection device, which starts, selects fault feeder；
Step 2：Extract fault feeder outlet zero-sequence current, it is any perfect feeder line outlet zero-sequence current and bus residual voltage it is temporary
State component is respectively i0n_T、i0i_T(i=1,2 ..., n-1), u0f_T；
Step 3：Fault feeder is calculated respectively and this perfects feeder line outlet throwing of the transient zero-sequence current to bus transient zero-sequence voltage
Shadow coefficient ξn、ξi, formula is：
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Step 4：Calculate fault feeder transient state capacitance current
Step 5：Subtracting fault feeder transient state capacitance current using fault feeder outlet transient zero-sequence current, to calculate trouble point temporary
State zero-sequence current, i.e.,
Step 6：Calculate trouble point transition resistance resistance R.
2. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method according to claim 1, its feature
Be, be in step 4 using bus transient zero-sequence voltage and faulty line, it is any perfect feeder line transient zero-sequence current and the two
Calculated in the projection coefficient of bus transient zero-sequence voltage and obtain fault feeder transient state capacitance current, calculation formula is：
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3. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method according to claim 1, its feature
Be, be in step 5 using bus transient zero-sequence voltage and faulty line, it is any perfect feeder line transient zero-sequence current and the two
Calculated in the projection coefficient of bus transient zero-sequence voltage and obtain trouble point transient zero-sequence current, calculation formula is as follows：
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4. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method according to claim 1, its feature
It is, trouble point transition resistance is the ratio of bus transient zero-sequence voltage and trouble point transient zero-sequence current in step 6, calculates public
Formula is as follows：
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5. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method according to claim 3, its feature
Be, the trouble point transient zero-sequence current be using bus transient zero-sequence voltage and faulty line transient zero-sequence current and its
The projection coefficient of bus transient zero-sequence voltage is calculated and obtained, and calculation formula is as follows：
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6. a kind of resonant earthed system high resistance earthing fault transition resistance discrimination method according to claim 4, its feature
It is, the trouble point transition resistance is the ratio of bus transient zero-sequence voltage and trouble point transient zero-sequence current, i.e. trouble point
Transition resistance is equal to the inverse of faulty line transient zero-sequence current projection coefficient on transient zero-sequence voltage, and calculation formula is as follows：
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