CN106483427A - Small current earthing wire-selecting method - Google Patents
Small current earthing wire-selecting method Download PDFInfo
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- CN106483427A CN106483427A CN201610882289.3A CN201610882289A CN106483427A CN 106483427 A CN106483427 A CN 106483427A CN 201610882289 A CN201610882289 A CN 201610882289A CN 106483427 A CN106483427 A CN 106483427A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to small current earthing wire-selecting method, the method includes：When the ground connection event of bus is detected, obtain the zero-sequence current of first line；Obtain the first residual voltage of bus, and obtain the first zero-sequence current of a plurality of feeder line；When first line disconnects, obtain the second residual voltage of bus and the second zero-sequence current of a plurality of feeder line；Using delta algorithm, calculate and determine the second circuit；When first line is closed a floodgate, obtain the 3rd residual voltage of bus and the 3rd zero-sequence current of a plurality of feeder line；Using delta algorithm, calculate and determine tertiary circuit；Judge whether the second circuit and tertiary circuit are same circuit, in this way, then judge the second circuit as faulty line.By delta algorithm, after the first line of suspected malfunctions is disconnected and closes a floodgate again, obtain current increment and then judge faulty line, the diagnostic accuracy of small current one-way earth fault can be effectively improved, effectively improve diagnosis efficiency.
Description
Technical field
The present invention relates to small current ground connection technology field, especially relate to small current earthing wire-selecting method.
Background technology
Small Electric Current Earthing And Routing Device is used for indicating the circuit that singlephase earth fault occurs, this device is widely used in
The power supply of the large factories and mines enterprises such as the transformer station of power system, power plant, power station and chemical industry, oil recovery, metallurgy, coal, railway
System.When most of small current occurs singlephase earth fault at present, its pointing accuracy is relatively low, often only manually sentences by dispatcher
Disconnected, a rule circuit examination is drawn, and excludes one by one, this artificial inefficient operation, and processing a problem needs the substantial amounts of time,
And result is very inaccurate.
Content of the invention
Based on this it is necessary to be directed to traditional, defect of inefficiency low to the diagnostic accuracy of small current singlephase earth fault,
A kind of small current earthing wire-selecting method is provided.
A kind of small current earthing wire-selecting method, including：
Step a：The ground connection event of detection bus；
Step b：When the described ground connection event of described bus is detected, obtain the zero-sequence current of first line；
Step c：Obtain the first residual voltage of described bus, and according to the corresponding a plurality of feeder line of described bus, obtain many
First zero-sequence current of feeder line described in bar；
Step d：When described first line disconnects, obtain the second residual voltage of described bus and a plurality of described feeder line
Second zero-sequence current；
Step e：The first residual voltage according to described bus and the zero-sequence current of the second residual voltage, described first line
And the first zero-sequence current of a plurality of described feeder line and the second zero-sequence current, using delta algorithm, calculate and determine the second circuit；
Step f：When described first line is closed a floodgate, obtain the 3rd residual voltage of described bus and a plurality of described feeder line
3rd zero-sequence current；
Step g：The second residual voltage according to described bus and the 3rd residual voltage, the zero-sequence current of first line and
Second zero-sequence current of a plurality of described feeder line and the 3rd zero-sequence current, using delta algorithm, calculate and determine tertiary circuit；
Step h：Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step i；
Step i：Judge described second circuit as faulty line.
In one embodiment, step e includes：
Described second zero sequence of the first residual voltage, the second residual voltage and a plurality of described feeder line according to described bus
Electric current calculates the first reduced current obtaining a plurality of described feeder line respectively；
Described first reduced current of the zero-sequence current according to described first line and a plurality of described feeder line calculates respectively
Obtain the first current increment of a plurality of described feeder line；
Obtain three maximum described feeder lines of the first current increment；
With the corresponding three described feeder lines of described first reduced current immediate with the zero-sequence current of described first line
In one as described second circuit.
In one embodiment, step g includes：
Described 3rd zero sequence of the second residual voltage, the 3rd residual voltage and a plurality of described feeder line according to described bus
Electric current calculates the second reduced current obtaining a plurality of described feeder line respectively；
Described second reduced current of the second zero-sequence current according to a plurality of described feeder line and a plurality of described feeder line is respectively
Calculate the second current increment obtaining a plurality of described feeder line；
Obtain three maximum described feeder lines of the second current increment；
With the corresponding three described feeder lines of described second reduced current immediate with the zero-sequence current of described first line
In one as described tertiary circuit.
In one embodiment, step h includes：
Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step i, such as no, then
Execution step j：According to current increment, multiple described feeder lines are ranked up.
In one embodiment, step j includes：According to current increment order from large to small, multiple described feeder lines are carried out
Sequence.
In one embodiment, step j includes：According to current increment order from large to small, multiple described feeder lines are carried out
Sequence, and export.
In one embodiment, step b includes：
When the described ground connection event of described bus is detected, described first line is obtained according to the route selection result at station end；
Obtain the zero-sequence current of described first line.
In one embodiment, include after step c：
Disconnect described first line.
In one embodiment, also include after the described step disconnecting described first line：
Detection ground connection event whether there is；
When described ground connection event still suffers from, then execution step d.
In one embodiment, also include after the step that described detection ground connection event whether there is：
When described ground connection event does not exist, then judge described first line as faulty line.
Above-mentioned small current earthing wire-selecting method, by delta algorithm, disconnects to the first line of suspected malfunctions and again
After combined floodgate, thus obtaining current increment and then judging faulty line such that it is able to effectively improve small current one-way earth fault
Diagnostic accuracy, and effectively improve diagnosis efficiency.
Brief description
Fig. 1 is the schematic flow sheet of the small current earthing wire-selecting method of an embodiment；
Fig. 2 is the schematic flow sheet of the small current earthing wire-selecting method of another embodiment；
Fig. 3 A is the controlling interface schematic diagram that circuit M is closed a floodgate of another embodiment；
Fig. 3 B is the interface schematic diagram of the feeder line sequencing display of another embodiment.
Specific embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can realize in many different forms however it is not limited to this paper institute
The embodiment of description.On the contrary, providing the purpose of these embodiments to be to make the understanding to the disclosure more thorough
Comprehensively.
For example, a kind of small current earthing wire-selecting method, including：The ground connection event of detection bus；When described bus is detected
Described ground connection event when, obtain first line zero-sequence current；Obtain the first residual voltage of described bus, and according to described
The corresponding a plurality of feeder line of bus, obtains the first zero-sequence current of a plurality of described feeder line；When described first line disconnects, obtain institute
State the second residual voltage of bus and the second zero-sequence current of a plurality of described feeder line；The first residual voltage according to described bus and
First zero-sequence current of the second residual voltage, the zero-sequence current of described first line and a plurality of described feeder line and the second zero sequence electricity
Stream, using delta algorithm, calculates and determines the second circuit；When described first line is closed a floodgate, obtain the 3rd zero sequence of described bus
Voltage and the 3rd zero-sequence current of a plurality of described feeder line；The second residual voltage according to described bus and the 3rd residual voltage,
Second zero-sequence current of the zero-sequence current of one circuit and a plurality of described feeder line and the 3rd zero-sequence current, using delta algorithm, count
Calculate and determine tertiary circuit；Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then judge described
Two circuits are faulty line.
As shown in figure 1, small current earthing wire-selecting method of the present invention embodiment, comprise the following steps：
Step 102：The ground connection event of detection bus.
Specifically, bus is connected with multiple feeder lines, and for example, bus corresponds to a plurality of feeder line, and this feeder line is the branch road of bus.
This busbar grounding event occurs single-phase earthing to trigger by the corresponding feeder line of bus, due to the ground connection of feeder line, thus causing bus
Ground connection, thus trigger the ground connection event of bus.The monitoring system of main website persistently detects to bus, the ground connection letter of detection bus
Number, when receiving ground signalling, then trigger ground connection event.For example, the monitoring system of main website detects busbar voltage three-phase injustice
Weighing apparatus, have issued warning signal, thus triggering ground connection event, to calculate the concrete feeder line that earth fault occurs.
Step 104：When the described ground connection event of described bus is detected, obtain the zero-sequence current of first line.
Specifically, first line is suspected malfunctions circuit, and that is, this first line is to be likely to be the feeder line of ground connection.In bus
After triggering ground connection event, main website monitoring system is scanned to branch road (feeder line) all of to this bus, and calculates possibility
The circuit of small current neutral grounding occurs, that is, this circuit is first line.For example, the line-to-ground signal by sending on end of standing is permissible
Calculate outbound end route selection result, obtaining doubtful faulty line is first line, reads the zero-sequence current of this first line.
It is noted that when being grounded in circuit, get an electric shock or during leak current fault, have leakage current to flow through in loop,
At this moment the three-phase current phasor and not etc. zero of transformer, its phasor and as zero-sequence current, such transformer secondary coil are passed through
In just have a faradic current, this electric current is added on the electronic amplification circuit of detection part, with protection zone device predetermined action electric current
Value compares, if being more than action current, makes sensitive relay action, acts on executive component tripping operation.Here the mutual inductance being connect
Device is referred to as zero sequence current mutual inductor, the phasor of three-phase current and be not equal to zero, and produced electric current is zero-sequence current.In the same manner may be used
Know residual voltage be occur ground connection when, three-phase voltage sum.
Step 106：Obtain the first residual voltage of described bus, and according to the corresponding a plurality of feeder line of described bus, obtain
First zero-sequence current of a plurality of described feeder line.
For example, the residual voltage of described bus and the zero-sequence current of the corresponding a plurality of feeder line of described bus, this zero sequence are obtained
Voltage and zero-sequence current are the first residual voltage and the first zero-sequence current.For example, obtain described bus the first residual voltage and
First zero-sequence current of a plurality of feeder line in addition to first line.For example, main website reads the first residual voltage and the slave station end of bus
Read the first zero-sequence current of each feeder line on this bus.For example, the corresponding a plurality of feeder line for described bus, obtains each respectively
First zero-sequence current of feeder line.
Step 108：When described first line disconnects, obtain the second residual voltage of described bus and a plurality of described feeder line
The second zero-sequence current.
For example, before this step, disconnect including by described first line.For example, when described first line disconnects, obtain
Second residual voltage of described bus and the second zero-sequence current of a plurality of described feeder line in addition to first line.Specifically, doubting
After the first line disconnection of faulty line, that is, after first line tripping operation, obtain residual voltage and place's first line of bus
The zero-sequence current of outer each feeder line, the residual voltage in this step and zero-sequence current are respectively the second residual voltage and the second zero sequence
Electric current.For example, the corresponding a plurality of feeder line for described bus, obtains the second zero-sequence current of each feeder line respectively.
Step 110：The first residual voltage according to described bus and the zero sequence electricity of the second residual voltage, described first line
First zero-sequence current of stream and a plurality of described feeder line and the second zero-sequence current, using delta algorithm, calculate and determine the second circuit.
Specifically, this second circuit is suspected malfunctions circuit, and that is, this second circuit is the feeder line possible being grounded.
For example, described according to the first residual voltage of described bus, the second residual voltage and a plurality of described feeder line
Two zero-sequence currents calculate the first reduced current obtaining a plurality of described feeder line respectively；According to a plurality of described feeder line the described 1st
Described first reduced current of sequence electric current and a plurality of described feeder line calculates the first electric current increasing obtaining a plurality of described feeder line respectively
Amount；Obtain three maximum described feeder lines of the first current increment；With immediate with the zero-sequence current of described first line described
One in the corresponding three described feeder lines of first reduced current as described second circuit.Specifically, this first current increment
For zero-sequence current increment.
For example, the second zero sequence electricity of the first residual voltage, the second residual voltage and a plurality of described feeder line according to bus
Stream calculates the first reduced current obtaining a plurality of described feeder line respectively, calculates first zero-sequence current and first of a plurality of feeder line respectively
The absolute value of the difference of reduced current, obtaining this absolute value is the first current increment, and current increment is the corresponding current wave of this feeder line
Dynamic, choose three maximum feeder lines of the first current increment, choose immediate with the zero-sequence current of described first line described the
In the corresponding three described feeder lines of one reduced current one, as described second circuit, for example, obtains zero with first line
The first minimum reduced current of the absolute value of sequence difference between currents, for example, chooses and the difference of zero-sequence current of described first line
In the minimum corresponding three described feeder lines of the first reduced current of absolute value one as described second circuit, for example, successively
First reduced current of three feeder lines is contrasted with the zero-sequence current of first line, acquisition is connect most with the zero-sequence current of first line
The near corresponding feeder line of the first reduced current, this feeder line is the second circuit.Choose three feeder lines from a plurality of feeder line, and again from three
Choose one in bar feeder line as the second circuit, route selection efficiency can be effectively improved, it is to avoid between from a plurality of feeder line, choose one
Bar leads to inefficiency as the second circuit.
Step 112：When described first line is closed a floodgate, obtain the 3rd residual voltage of described bus and a plurality of described feeder line
The 3rd zero-sequence current.
For example, before this step, close a floodgate again including by described first line.For example, when described first line is closed a floodgate,
Obtain the 3rd residual voltage of described bus and the 3rd zero-sequence current of a plurality of described feeder line in addition to first line.Specifically,
After the first line of suspected malfunctions circuit is closed a floodgate, obtain the residual voltage of bus and the zero sequence locating each feeder line outside first line
Electric current, the residual voltage in this step and zero-sequence current are respectively the 3rd residual voltage and the 3rd zero-sequence current.For example, for institute
State the corresponding a plurality of feeder line of bus, obtain the 3rd zero-sequence current of each feeder line respectively.
Step 114：The second residual voltage according to described bus and the 3rd residual voltage, first line zero-sequence current with
And the second zero-sequence current of a plurality of described feeder line and the 3rd zero-sequence current, using delta algorithm, calculate and determine tertiary circuit.
Specifically, this tertiary circuit is suspected malfunctions circuit, and that is, this tertiary circuit is the feeder line possible being grounded.For example, should
Tertiary circuit and the second circuit are same circuit, and and for example, this tertiary circuit and the second circuit are different circuit.In this step,
After first line is closed a floodgate again, calculate and get another faulty line, carry out secondary sentencing by the second circuit with above-mentioned acquisition
Disconnected, thus improving the judgement precision of faulty line.
For example, described according to the second residual voltage of described bus, the 3rd residual voltage and a plurality of described feeder line
Three zero-sequence currents calculate the second reduced current obtaining a plurality of described feeder line respectively；The second zero sequence electricity according to a plurality of described feeder line
Described second reduced current of stream and a plurality of described feeder line calculates the second current increment obtaining a plurality of described feeder line respectively；Obtain
Take three maximum described feeder lines of the second current increment；With described second folding immediate with the zero-sequence current of described first line
One in the calculation corresponding three described feeder lines of electric current as described tertiary circuit.Specifically, this second current increment is zero sequence
Current increment.
For example, the 3rd zero sequence electricity of the second residual voltage, the 3rd residual voltage and a plurality of described feeder line according to bus
Stream calculates the second reduced current obtaining a plurality of described feeder line respectively, calculates second zero-sequence current and second of a plurality of feeder line respectively
The absolute value of the difference of reduced current, obtaining this absolute value is the second current increment, before and after this current increment is for first line combined floodgate
The current wave momentum of feeder line, chooses three maximum feeder lines of the second current increment, chooses the zero-sequence current with described first line
In the corresponding three described feeder lines of immediate described second reduced current one, as described tertiary circuit, for example, obtains
Second reduced current minimum with the absolute value of the difference of the zero-sequence current of first line, for example, with zero with described first line
One article in the minimum corresponding three articles of described feeder lines of the second reduced current of the absolute value of sequence difference between currents as described 3rd line
Road, for example, the second reduced current to three feeder lines and the zero-sequence current contrast of first line, choose and first line successively
The corresponding feeder line of immediate second reduced current of zero-sequence current is tertiary circuit.Choose three feeder lines from a plurality of feeder line, and
Choose one again as tertiary circuit from three feeder lines, route selection efficiency can be effectively improved, it is to avoid between from a plurality of feeder line
Choose one and lead to inefficiency as tertiary circuit.
Step 116：Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step
118.
In this step, judge in above-mentioned steps, after first line tripping operation and closing a floodgate, to calculate successively and to obtain two circuits and the
Whether three circuits are same circuit.For example, obtain the identification marking of the second circuit and tertiary circuit, for example, obtain second respectively
Second identification marking of circuit and tertiary circuit and the 3rd identification marking, judge whether are the second identification marking and the 3rd identification marking
Identical, for example, judge whether the second circuit and tertiary circuit are same circuit by the second identification marking and the 3rd identification.This knowledge
It is not designated the unique identifier of feeder line, for distinguishing different feeder lines, for example, this identification marking is feeder line label, for example,
This identification marking encodes for feeder line, and for example, this identification marking is feeder line title.
Step 118：Judge described second circuit as faulty line.
Specifically, when the second circuit and tertiary circuit are same circuit, then judge the second circuit for faulty line.Due to
Calculated by delta algorithm twice and obtain two suspected malfunctions circuits, and two suspected malfunctions circuits are same circuit, therefore
Can accurately judge that this suspected malfunctions circuit, as faulty line, effectively increases the diagnostic accuracy of faulty line.
Pass through delta algorithm, after the first line of suspected malfunctions is disconnected and closes a floodgate again, thus obtaining in the present embodiment
Current increment and then judge faulty line such that it is able to effectively improve the diagnostic accuracy of small current one-way earth fault, and effectively
Improve diagnosis efficiency.
In one embodiment, step 116 includes：
Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step 118, such as no,
Then execution step 119：
Step 119 is：According to current increment, multiple described feeder lines are ranked up.
Specifically, in the present embodiment, when the second circuit and tertiary circuit are not same circuit, then show the second circuit
Or tertiary circuit is not high for the probability of fault, now cannot accurately judge faulty line, need to be ranked up all feeder lines,
So that testing staff can sequentially investigate faulty line, to improve the diagnosis efficiency of fault.
For example, according to current increment, order from large to small is ranked up to multiple described feeder lines.For example, increased according to electric current
Amount order from large to small is ranked up to multiple described feeder lines, and exports.For example, the order from large to small according to current increment
Multiple described feeder lines are ranked up, and output display.
Specifically, in above-described embodiment, according to the current increment of each feeder line getting in aforesaid step, electric current is increased
Amount is ranked up from large to small, and to each current increment, corresponding feeder line is ranked up, by ranking results output display.Due to this
Current increment is to sort from large to small, and therefore, the feeder line coming the prostatitis of sequence is preferential investigation object, that is, the feedback stood out
Line is that the probability of faulty line is higher, so that testing staff sequentially can investigate diagnosis, can relatively rapid be diagnosed to be event
Barrier circuit, thus improve fault diagnosis efficiency.For example, current increment described in the present embodiment is the first current increment, and
If current increment described in the present embodiment is the second current increment.
For example, feeder line is disconnected according to this by the order of above-mentioned sequence, and often disconnect detection ground connection event during a feeder line, until
Ground connection event does not exist, then investigating out corresponding feeder line is faulty line.
In one embodiment, step 104 includes：
When the described ground connection event of described bus is detected, described first line is obtained according to the route selection result at station end.
Obtain the zero-sequence current of described first line.
Specifically, when the ground connection event of bus is detected, the route selection result at extraction station end, according to the route selection result at station end
Obtain the first line of suspected malfunctions circuit, and slave station end obtains the zero-sequence current of first line.
In one embodiment, include after step 106：Disconnect described first line.
For example, obtain open command, disconnect described first line.Specifically, the control system of main website receives input and breaks
Open instruction, so that first line is disconnected, that is, so that first line is tripped.
In one embodiment, also include after the described step disconnecting described first line：
Detection ground connection event whether there is；When described ground connection event still suffers from, then execution step 108；When described ground connection
When event does not exist, then judge described first line as faulty line.
Specifically, after the first line of suspected malfunctions disconnects, whether detection ground connection event still suffers from again, for example, inspection
Survey and whether there is ground signalling.If this first line is faulty line, then after this first line disconnects, ground connection event or ground connection are believed
Number will disappear, when still suffering from ground connection event, show that this first line is not faulty line, accordingly, it would be desirable to faulty line
Diagnosed, execution step 108, faulty line is judged by delta algorithm.And after working as first line disconnection, ground connection event is not deposited
Or disappear, then show that first line is faulty line, now judge first line as faulty line.
A specific embodiment is presented herein below：
As shown in Fig. 2 in the present embodiment, comprise the following steps：
Step 202, detects ground connection event, starts route selection.
Specifically, in the present embodiment, ground connection event is landing operation, busbar grounding action is detected in this step, represents and sends out
Raw earth fault, system starts to carry out route selection calculating, tracing trouble circuit to each feeder line.
Step 204, according to station end route selection result, judges circuit M.
In the present embodiment, circuit M is suspected malfunctions circuit, i.e. first line.The choosing of the line selection apparatus at main website acquisition station end
Knot fruit, obtains circuit M, judges this circuit M as suspected malfunctions circuit, and obtain the zero-sequence current I of this circuit M0[km].
Stand end the route selection server of line selection apparatus model adopt PAS model, the data of each feeder line collecting is entered
Row calculates, and calculates acquisition suspected malfunctions circuit according to the trigger condition of ground connection.For example, main website monitors busbar voltage three-phase not
Balance, have issued alarm, thus triggering the calculating of line selection apparatus, all of branch road is scanned to this bus, and calculating can
The circuit of small current neutral grounding can occur.
Step 206, extracts the zero-sequence current of bus residual voltage and all branch roads of bus.
In this step, extract the first residual voltage U of bus0The first zero-sequence current I with all feeder lines in addition to circuit M0
[].For example, for feeder line z, obtain or extract feeder line z the first zero-sequence current I0[z]；For example, the corresponding N bar of described bus
Feeder line, z=1,2,3 ... N and do not include M, M are selected from one of 1,2,3 ... N, and remaining embodiment is by that analogy, no longer superfluous
State.
By the zero-sequence current that collects of line selection apparatus and the residual voltage at end of standing, by soft message by zero-sequence current and zero
These data is activations of sequence voltage adjust intelligent route selection server with arriving to telecontrol communication machine again, so that station end analog quantity can be by main website
Collect.
Step 208, open-circuit line M, judge whether earth fault disappears, be then execution step 210, otherwise execution step
212.
This step trips to circuit M, and judges whether earth fault disappears, and that is, whether detection ground connection event still suffers from.
Step 210, judges circuit M as faulty line, and terminates route selection.
Specifically, when determining the result whether earth fault disappear is to be, then judge circuit M as faulty line, that is,
There is earth fault in circuit M, then route selection terminates.
Step 212, using current increment algorithm, judges circuit K1.
Specifically, circuit K1 is suspected malfunctions circuit.After circuit M disconnects, earth fault still suffers from, and represents circuit M simultaneously
It is not faulty line.In this step, will judge to obtain the circuit K1 of suspected malfunctions circuit using delta algorithm.
First, the second zero-sequence current I of all feeder lines in addition to circuit M after extraction is tripped1Second zero sequence of [] and bus
Voltage U1.
Subsequently, the first residual voltage U according to bus0, the second residual voltage U1And the second zero sequence of a plurality of described feeder line
Electric current I1[] calculates the first reduced current I obtaining a plurality of described feeder line respectively1 *[], specifically, according to the second residual voltage U1
With the first residual voltage U0Ratio and the second zero-sequence current I1The product of [] calculates the first reduced current I1 *[]：
First reduced current is I1 *[]=I1[]*U1/U0
Drawing the first reduced current I1 *After [], calculate the first zero-sequence current I of a plurality of feeder line respectively0[] and the first folding
Calculate electric current I1 *The absolute value of the difference of [], obtaining this absolute value is the first current increment Ix[]：
First current increment is：Ix[]=| I0[]-I1 *[]|
Select the first current increment I in addition to circuit Mx[] maximum three-line, determines the first folding from this three-line
Calculate electric current I1 *The zero-sequence current I of [] and circuit M0[km] numerical value immediate circuit K1.
Step 214, circuit M is closed a floodgate, and using current increment algorithm, judges circuit K2.
Specifically, circuit K2 is all suspected malfunctions circuit.As shown in Figure 3A, main website receives instruction, remotely circuit M is closed
Lock.After circuit M is closed a floodgate, judge to obtain the circuit K2 of suspected malfunctions circuit with delta algorithm.
First, the 3rd zero-sequence current I of all feeder lines in addition to circuit M after extraction is closed a floodgate23rd zero sequence of [] and bus
Voltage U2.
Subsequently, the second residual voltage U according to bus1, the 3rd residual voltage U2And the 3rd zero sequence of a plurality of described feeder line
Electric current I2[] calculates the second reduced current I obtaining a plurality of described feeder line respectively2 *[], specifically, according to the 3rd residual voltage U2
With the second residual voltage U1Ratio and the 3rd zero-sequence current I2The product of [] calculates the second reduced current I2 *[]：
Second reduced current is I2 *[]=I2[]*U2/U1
Obtain the second reduced current I calculating2 *After [], calculate the second zero-sequence current I of a plurality of feeder line respectively1[] and the
Two reduced current I2 *The absolute value of the difference of [], obtaining this absolute value is the second current increment Iy[]：
Second current increment is：Iy[]=| I1[]-I2 *[]|
Select the second current increment I in addition to circuit My[] maximum three-line, determines second from this three-line
Reduced current numerical value I2 *The zero-sequence current I of [] and circuit M0[km] numerical value immediate circuit K2.
Step 216, judges whether circuit K1 and circuit K2 is same circuit, in this way, then execution step 218, and otherwise, execution
Step 220.
Step 218, judges circuit K1 as faulty line.
In this step, when circuit K1 and circuit K2 is same circuit, then show that this circuit K1 is faulty line, then judge defeated
Go out, and terminate route selection.
Step 220, according to fault prioritization, exports faulty line queue.
Specifically, the fault priority in the present embodiment is related to the current increment of feeder line, i.e. the current increment of this feeder line
Bigger, then its fault priority is higher, and in this step, as shown in Figure 3 B, the current increment according to feeder line is from large to small to each feedback
Line is ranked up, and exports faulty line queue, and shows.So that testing staff sequentially can investigate diagnosis, can be more fast
It is diagnosed to be faulty line, thus improving fault diagnosis efficiency fastly.
Each technical characteristic of embodiment described above can arbitrarily be combined, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic applied in example is all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope of this specification record.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
Say, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of small current earthing wire-selecting method is it is characterised in that include：
Step a：The ground connection event of detection bus；
Step b：When the described ground connection event of described bus is detected, obtain the zero-sequence current of first line；
Step c：Obtain the first residual voltage of described bus, and according to the corresponding a plurality of feeder line of described bus, obtain a plurality of institute
State the first zero-sequence current of feeder line；
Step d：When described first line disconnects, obtain the second residual voltage of described bus and the second of a plurality of described feeder line
Zero-sequence current；
Step e：The first residual voltage according to described bus and the second residual voltage, the zero-sequence current of described first line and
First zero-sequence current of a plurality of described feeder line and the second zero-sequence current, using delta algorithm, calculate and determine the second circuit；
Step f：When described first line is closed a floodgate, obtain the 3rd residual voltage of described bus and the 3rd of a plurality of described feeder line the
Zero-sequence current；
Step g：The second residual voltage according to described bus and the 3rd residual voltage, the zero-sequence current of first line and a plurality of
Second zero-sequence current of described feeder line and the 3rd zero-sequence current, using delta algorithm, calculate and determine tertiary circuit；
Step h：Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step i；
Step i：Judge described second circuit as faulty line.
2. small current earthing wire-selecting method according to claim 1 is it is characterised in that step e includes：
Described second zero-sequence current of the first residual voltage, the second residual voltage and a plurality of described feeder line according to described bus
Calculate the first reduced current obtaining a plurality of described feeder line respectively；
Described first reduced current of the zero-sequence current according to described first line and a plurality of described feeder line calculates acquisition respectively
First current increment of a plurality of described feeder line；
Obtain three maximum described feeder lines of the first current increment；
With in the corresponding three described feeder lines of described first reduced current immediate with the zero-sequence current of described first line
Article one, as described second circuit.
3. small current earthing wire-selecting method according to claim 2 is it is characterised in that step g includes：
Described 3rd zero-sequence current of the second residual voltage, the 3rd residual voltage and a plurality of described feeder line according to described bus
Calculate the second reduced current obtaining a plurality of described feeder line respectively；
Described second reduced current of the second zero-sequence current according to a plurality of described feeder line and a plurality of described feeder line calculates respectively
Obtain the second current increment of a plurality of described feeder line；
Obtain three maximum described feeder lines of the second current increment；
With in the corresponding three described feeder lines of described second reduced current immediate with the zero-sequence current of described first line
Article one, as described tertiary circuit.
4. small current earthing wire-selecting method according to claim 1 is it is characterised in that step h includes：
Judge whether described second circuit and described tertiary circuit are same circuit, in this way, then execution step i, such as no, then execute
Step j：According to current increment, multiple described feeder lines are ranked up.
5. small current earthing wire-selecting method according to claim 4 is it is characterised in that step j includes：According to current increment
Order from large to small is ranked up to multiple described feeder lines.
6. small current earthing wire-selecting method according to claim 4 is it is characterised in that step j includes：According to current increment
Order from large to small is ranked up to multiple described feeder lines, and exports.
7. small current earthing wire-selecting method according to claim 1 is it is characterised in that step b includes：
When the described ground connection event of described bus is detected, described first line is obtained according to the route selection result at station end；
Obtain the zero-sequence current of described first line.
8. small current earthing wire-selecting method according to claim 1 is it is characterised in that include after step c：
Disconnect described first line.
9. small current earthing wire-selecting method according to claim 8 is it is characterised in that disconnect described first line described
Step after also include：
Detection ground connection event whether there is；
When described ground connection event still suffers from, then execution step d.
10. small current earthing wire-selecting method according to claim 9 is it is characterised in that in described detection ground connection event be
Also include after the step of no presence：
When described ground connection event does not exist, then judge described first line as faulty line.
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