CN108448562A - A kind of full compensation method of electric current based on singlephase earth fault and system - Google Patents
A kind of full compensation method of electric current based on singlephase earth fault and system Download PDFInfo
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- CN108448562A CN108448562A CN201810511933.5A CN201810511933A CN108448562A CN 108448562 A CN108448562 A CN 108448562A CN 201810511933 A CN201810511933 A CN 201810511933A CN 108448562 A CN108448562 A CN 108448562A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The present invention provides a kind of full compensation method of the electric current based on singlephase earth fault and system.When residual voltage is not located within the scope of preset voltage value, i.e., when generation singlephase earth fault is that instantaneity is grounded, by arc suppression coil device compensation of ground capacitance current of the high resistance ground identification with high sensitivity.When residual voltage is located within the scope of preset voltage value, when i.e. generation singlephase earth fault is that non-transient is grounded, by the breaker closing in the failure phase transfer earthing or grounding means being mutually connected with failure, it realizes that fault current switchs to earth current, and then the failure residual flow compensated entirely is exported by paid compensation device.Fault current is switched into the signal that earth current can also carry out tracing compensation using earth current as paid compensation device, the compensation effect for paid compensation device provides basis for estimation.In addition, earth current can be determined by measuring, and measurement is easy, is not necessarily to complicated calculations, so as to ensure that compensation quickly, accurately, improves compensation precision, shields fault point.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of electric current based on the singlephase earth fault sides of compensation entirely
Method and system.
Background technology
Neutral point of electric network ground connection refers to the electrical connection in three-phase alternating current Force system between neutral point and the earth, i.e., neutral
Point current potential is fixed as ground potential.According to neutral point, whether effective grounding is divided into heavy current grounding system for electric system, i.e., neutral
Point effectively earthed system and small current neutral grounding system, i.e. system with non effectively earth ed neutral.In small current neutral grounding system,
When singlephase earth fault occurs, due to neutral non-effective grounding, fault point not will produce big short circuit current, therefore can
Electric system is allowed to operate with failure in a short time, and then electric system can reduce customer outage hours, improving power supply can
By property.
Small current neutral grounding system includes Neutral Point Through Low Resistance and neutral by arc extinction coil grounding.Neutral point is through small
Resistance eutral grounding can utilize prodigious fault current to start line protective devices, while can also utilize the sensitive of relay protection
Property, quick-action quickly cuts off faulty line, and then significantly reduces personal electric shock probability.But Neutral Point Through Low Resistance is to distribution
The power supply reliability of net has larger impact, especially aerial network and hybrid network.Neutral by arc extinction coil grounding can have
The capacitive earth current of effect compensation electric system, reduces arc-gap voltage resume speed, improves arc gap dielectric strength, prevent electric arc weight
Combustion makes intermittence and connects voltage, avoids fault spread caused by electric arc, thus, neutral by arc extinction coil grounding be application at present compared with
For a kind of extensive earthing mode.But with the extensive use of power cable, the capacitive earth current of power distribution network dramatically increases, in
Property point cannot compensate active current and harmonic current components through grounding through arc mode.
In view of the above-mentioned problems, propose two kinds of solutions, i.e. failure phase transfer earthing mode and full compensation failure extinguishing arc side
Formula.For failure phase transfer earthing mode, artificial metallic earthing point is mutually put by failure can avoid by fault point not
Overvoltage problem caused by stable arc grounding, and then personal electric shock casualty accident can be reduced.Failure phase transfer is grounded
There is the shunting effect of fault current by transition Resistance Influence in mode, and the transfer effect of fault current is poor.In addition,
The problem of failure phase transfer earthing mode is influenced there is also fault point voltage by load current.When singlephase earth fault occurs,
Fault point will produce the voltage of several hectovolts, it cannot be guaranteed that personal safety.For compensating failure extinguishing arc mode entirely, in monitoring power train
Unite during network parameter, faulty line zero-sequence current etc., compensated by active power compensator harmonic component in fault current,
Active component and remaining reactive component.But full compensation failure extinguishing arc mode cannot eliminate active component in ground connection residual flow and
High frequency harmonic components, and then can not achieve the accurate compensation to electric system zero sequence capacitance current.In addition, compensating failure extinguishing arc entirely
Mode can not directly measure fault current, can only carry out indirect by very complicated algorithm and be calculated, therefore, full compensation event
Barrier extinguishing arc mode can not directly detect and as basis for estimation.
Invention content
The present invention provides a kind of full compensation method of the electric current based on singlephase earth fault and system, to solve existing full compensation
Failure extinguishing arc mode can not directly measure the problem of fault current.
A kind of full compensation method of electric current based on singlephase earth fault of the invention, including：
Busbar voltage, zero-sequence current and the residual voltage of three phase transmission line are obtained in real time；
Judge whether the residual voltage is located within the scope of preset voltage value；
If not being located at, arc suppression coil device compensation of ground capacitance current；
If being located at, the time that the residual voltage is located within the scope of the preset voltage value is recorded；
Determine that the three phase transmission line that singlephase earth fault occurs is failure phase power transmission line according to the busbar voltage；
Judge that earthing type, the earthing type include instantaneity ground connection and non-transient ground connection according to the time；
If the earthing type is grounded for the non-transient, control device sends out failure phase transfer instruction, so that therefore
Hinder phase transfer earthing or grounding means and control the failure phase power transmission line ground connection, paid compensation device exports the failure residual flow compensated entirely.
Preferably, the arc suppression coil device compensation of ground capacitance current includes：
The earthing capacitance current of system is determined according to the reactance of the zero-sequence current and arc suppression coil device；
Judge whether the difference of the inductive current and the capacitance current of the arc suppression coil device output is less than or equal to
Preset difference value, the inductive current are more than the capacitance current；
If the difference of the inductive current and the capacitance current is more than the preset difference value, the arc suppression coil is adjusted
The inductive current of device output, so that the difference of the inductive current and the capacitance current is less than or equal to the default difference
Value, and the inductive current is more than the capacitance current.
Preferably, judge that earthing type includes according to the time：
Judge whether the time of record is less than preset time；
If more than or be equal to, then the earthing type be non-transient ground connection.
Preferably, determine that the three phase transmission line that singlephase earth fault occurs is failure phase power transmission line according to the busbar voltage
Including：
The size for comparing the corresponding busbar voltage of the three phase transmission line determines the busbar electricity of voltage value minimum
It is failure phase power transmission line to press the corresponding three phase transmission line.
Preferably, the failure phase transfer earthing or grounding means, which controls the failure phase power transmission line and is grounded, includes：
The failure phase transfer earthing or grounding means receives the control device and sends out the failure phase transfer instruction, passes through open circuit
The failure phase power transmission line is grounded by device.
Preferably, the calculation formula of the inverse value of the failure residual flow is：
Wherein, IccFor failure residual flow；RgFor transition resistance；RzFor ground resistance；IzFor earth current.
Preferably, the preset voltage value ranging from 10-60v.
The present invention provides a kind of full compensation system of the electric current based on singlephase earth fault, including control device, failure phase turn
Moving device, arc suppression coil device and paid compensation device, wherein
The control device is electrically connected the failure phase transfer device, the paid compensation device and three-phase power transmission
Line；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are connected in parallel；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are respectively connected to institute
State each phase of three phase transmission line；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are grounded.
Preferably, the failure phase transfer device includes ground resistance and three breakers in parallel, the control dress
It sets and is electrically connected each breaker；The both ends of three breakers respectively connect each of the three phase transmission line
Phase and the ground resistance, the ground resistance earth.
Preferably, the system also includes grounding transformer, the grounding transformer is serially connected with the arc suppression coil device
Between the three phase transmission line, the grounding transformer be also serially connected with the paid compensation device and the three phase transmission line it
Between.
The technical solution that the embodiment of the present invention provides can include the following benefits：
The present invention provides a kind of full compensation method of the electric current based on singlephase earth fault and system.When residual voltage is not located at
When within the scope of preset voltage value, that is, when the earthing type that singlephase earth fault occurs is that instantaneity is grounded, by high resistance ground
Identify the arc suppression coil device compensation of ground capacitance current with high sensitivity.When residual voltage is located within the scope of preset voltage value
When, that is, when the earthing type that singlephase earth fault occurs is that non-transient is grounded, the failure phase transfer that will mutually be connected with failure
Breaker closing in earthing or grounding means realizes that fault current switchs to earth current, and then exports complete mend by paid compensation device
The failure residual flow repaid.Fault current is switched to earth current to mend into line trace using earth current as paid compensation device
The signal repaid, the compensation effect for paid compensation device provide basis for estimation.In addition, earth current can be determined by measuring,
And simplicity is measured, complicated calculations are not necessarily to, so as to ensure that compensation is quick, accurate, raising compensation precision shields fault point.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
It can the limitation present invention.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other drawings may also be obtained based on these drawings.
Fig. 1 is the flow diagram of the full compensation method of the electric current provided in an embodiment of the present invention based on singlephase earth fault；
Fig. 2 is the flow diagram of arc suppression coil device compensation of ground capacitance current provided in an embodiment of the present invention；
Fig. 3 is the application scenario diagram of the full compensation system of the electric current provided in an embodiment of the present invention based on singlephase earth fault；
Fig. 4 is the structural schematic diagram of the full compensation system of the electric current provided in an embodiment of the present invention based on singlephase earth fault；
Symbolic indication：
1- control devices, 2- failure phase transfer devices, 3- arc suppression coil devices, the paid compensation devices of 4-, 5- are grounded transformation
Device, 21- ground resistances, 22- breakers.
Specific implementation mode
Attached drawing 1 is please referred to, attached drawing 1 shows that the electric current provided by the embodiments of the present application based on singlephase earth fault compensates entirely
The flow diagram of method.By attached drawing 1 it is found that the electric current provided by the embodiments of the present application based on the singlephase earth fault side of compensation entirely
Method specifically includes：
S01：Busbar voltage, zero-sequence current and the residual voltage of three phase transmission line are obtained in real time.
Current transmission line of electricity is usually three phase transmission line, i.e. A phases power transmission line, B phases power transmission line and C phase power transmission lines.At this
Apply in embodiment, the control in the full compensation system of electric current (following full compensation systems of abbreviation electric current) based on singlephase earth fault
Device is acquired per busbar voltage, zero-sequence current and the residual voltage of phase power transmission line in three phase transmission line, in order in transmission line of electricity
When singlephase earth fault occurs, the full compensation system of electric current is according to collected busbar voltage, zero-sequence current and residual voltage to electricity
Force system carries out electric current and compensates entirely.
Since the time that single-phase earthing occurs for power circuit is uncertain, consequently, to facilitate finding that single-phase earthing occurs in time
The transmission line of electricity of failure needs the voltage, the curent change that monitor every transmission line of electricity.In the embodiment of the present application, pass through control
Device acquires in three phase transmission line and monitors every per the mode of the busbar voltage of phase power transmission line, zero-sequence current and residual voltage in real time
Voltage, the curent change of transmission line of electricity.
S02：Judge whether the residual voltage is located within the scope of preset voltage value.
The preset voltage value range of residual voltage is provided in control device.When control device collects three-phase power transmission in real time
When in line per the residual voltage of phase power transmission line, control device judges whether collected residual voltage is located at preset voltage value range
It is interior, it is realized in different ways in order to the full compensation system of electric current and the electric current of electric system is compensated entirely.This application is implemented
In example, preset voltage value ranging from 10-60v.
S03：If not being located at, arc suppression coil device compensation of ground capacitance current.
If collected residual voltage is not located within the scope of preset voltage value control device in real time, collected zero sequence electricity
The voltage value of pressure is smaller.It is grounded for instantaneity at this point, the earthing type of singlephase earth fault occurs.It is mended by arc suppression coil device
Repaying the mode of earthing capacitance current just can realize the compensation blow-out occurred at singlephase earth fault, and then realize to electric system
Electric current compensate entirely.Therefore, in the embodiment of the present application, when collected residual voltage is not located at default electricity to control device in real time
When within the scope of pressure value, the electric current of electric system is compensated entirely by the realization of arc suppression coil device compensation of ground capacitance current.
Specifically, as shown in Fig. 2, in the embodiment of the present application, arc suppression coil device compensation of ground capacitance current it is specific
Process includes：
S031：The earthing capacitance current of system is determined according to the reactance of the zero-sequence current and arc suppression coil device.
Arc suppression coil device in the embodiment of the present application has multiple gears for adjusting reactance size, and each gear corresponds to
The numerical value of reactance and the numerical value of outputting inductance electric current be known.Therefore, by reading the gear of arc suppression coil device just
It can learn the reactance of arc suppression coil device.
System is determined according to the reactance of control device collected zero-sequence current and the arc suppression coil device of reading in real time
It is grounded capacitive reactance.The calculation formula of system earth capacitive reactance is：Wherein, XCFor system earth capacitive reactance；
I01、I02The respectively corresponding zero-sequence current value of two gears of arc suppression coil device；X01、X02Respectively arc suppression coil device
The corresponding reactance value of two gears.
According in determining system earth capacitive reactance and three phase transmission line system is determined per the residual voltage of phase power transmission line
Earthing capacitance current.The calculation formula of earthing capacitance current is：IC=Ui/XC, wherein ICFor earthing capacitance current；UiTo occur
The residual voltage of failure phase；XCFor system earth capacitive reactance.
S032：The difference of the inductive current and the capacitance current that judge arc suppression coil device output whether be less than or
Equal to preset difference value, the inductive current is more than the capacitance current.
In general, the inductive current of arc suppression coil device output is slightly larger than the earthing capacitance current of system, i.e. inductive current
Numerical value is more than the numerical value of capacitance current, is compensated entirely the electric current of system at this point, arc suppression coil device can be realized.Due to arc coil
Therefore the inductive current of device output is deposited slightly larger than the earthing capacitance current of system between inductive current and earthing capacitance current
In certain difference.In the embodiment of the present application, the difference between inductive current and earthing capacitance current is preset difference value, and should
Preset difference value can specifically be set according to practical situations.
When singlephase earth fault occurs, to judge whether the gear for needing to adjust arc suppression coil device, need to judge to disappear
Whether the inductive current of camber line coil apparatus output is slightly larger than the earthing capacitance current of system, that is, judges arc suppression coil device output
Whether the difference of inductive current and capacitance current is less than or equal to preset difference value.
S033：If the difference of the inductive current and the capacitance current is more than the preset difference value, disappear described in adjustment
The inductive current of camber line coil apparatus output, so that the difference of the inductive current and the capacitance current is less than or equal to described pre-
If difference, and the inductive current is more than the capacitance current.
If the difference of inductive current and capacitance current is more than preset difference value, the inductance electricity of arc suppression coil device output is adjusted
It flows so that the difference of inductive current and capacitance current is less than or equal to preset difference value, and inductive current is more than capacitance current.In general,
By adjusting the inductive current of the gear adjustment arc suppression coil device output of arc suppression coil device, i.e., filled by adjusting arc suppression coil
The inductive current for the reactance adjustment arc suppression coil device output set.
If the difference of inductive current and capacitance current is more than preset difference value, and the numerical value of inductive current is much larger than capacitance electricity
The numerical value of stream then improves the reactance of arc suppression coil device, so that the inductive current of arc suppression coil device output reduces, inductance electricity
The difference of stream and capacitance current is less than or equal to preset difference value and inductive current is more than capacitance current.If inductive current and capacitance electricity
The difference of stream is more than preset difference value, and the numerical value of inductive current is less than the numerical value of capacitance current, then reduces arc suppression coil device
Reactance, so that the inductive current of arc suppression coil device output improves, the difference of inductive current and capacitance current is less than or equal to
Preset difference value and inductive current are more than capacitance current.
When the difference of inductive current and capacitance current is less than or equal to preset difference value, and inductive current is more than capacitance current,
The inductive current of arc suppression coil device output is not adjusted then.
S04：If being located at, the time that the residual voltage is located within the scope of the preset voltage value is recorded.
If collected residual voltage is located within the scope of preset voltage value control device in real time, records residual voltage and be located at
The duration of singlephase earth fault occurs for the time within the scope of preset voltage value, i.e. record.
S05：Determine that the three phase transmission line that singlephase earth fault occurs is failure phase power transmission line according to the busbar voltage.
When collected residual voltage is located within the scope of preset voltage value control device in real time, according to collected busbar
Voltage determines that singlephase earth fault occurs for which phase three phase transmission line, and then is event by the three phase transmission line that singlephase earth fault occurs
Hinder phase power transmission line.Specifically, compare the size of the corresponding busbar voltage of three phase transmission line, choose the busbar voltage of voltage value minimum
Corresponding three phase transmission line is failure phase power transmission line.If the bus voltage value of A phase power transmission lines is 15kv, the busbar of B phase power transmission lines
Voltage value is that the bus voltage value of 20kv and C phase power transmission lines is 22kv.The bus voltage value of A phase power transmission lines is minimum, therefore, really
It is the failure phase power transmission line that singlephase earth fault occurs to determine A phases power transmission line.
S06：Judge earthing type according to the time of record, the earthing type includes instantaneity ground connection and non-instantaneous
Property ground connection.
When singlephase earth fault occurs, time of ground connection is different, therefore, different by earthing type according to the ground connection time
It is divided into instantaneity ground connection and non-transient ground connection.As a result, in this embodiment of the present application, ground connection class is judged according to the time of record
Type.Specifically, the preset time of ground connection is set in control device.Judge whether the time of record is less than preset time.Work as record
Time be less than preset time when, determine this time occur singlephase earth fault earthing type be instantaneity ground connection.When record
When time is greater than or equal to, determine that the earthing type of singlephase earth fault this time occurs to be grounded for non-transient.
In the embodiment of the present application, preset time is usually 3-10s, and the specific time determines according to practical application scene.
S07：If the earthing type is grounded for the non-transient, control device sends out failure phase transfer instruction, with
Failure phase transfer earthing or grounding means is set to control the failure phase power transmission line ground connection, the failure that paid compensation device output compensates entirely is residual
Stream.
If the earthing type of singlephase earth fault occurs to be grounded for non-transient, control device sends out failure phase transfer and refers to
It enables, failure phase transfer earthing or grounding means and paid compensation device make corresponding action according to failure phase transfer instruction.
Specifically, when the earthing type that singlephase earth fault occurs is that non-transient is grounded, control device is to failure phase
Transfer earthing or grounding means sends out failure phase transfer instruction, and failure phase transfer instruction, which is used to indicate, will occur to produce at singlephase earth fault
Raw fault current is shifted.After failure phase transfer earthing or grounding means receives failure phase transfer instruction, by will be with failure
The breaker closing that phase power transmission line is connected is realized fault current part being transferred to failure phase transfer earthing or grounding means, is at this time
The failure residual flow of system includes remaining fault current and the earth current for being transferred to failure phase transfer earthing or grounding means.
In attached drawing 3, when singlephase earth fault occurs for A phase power transmission lines, i.e. fault point G passes through transition resistance RgOccur single
When phase earth fault, the fault current I of generationgFlow through transition resistance RgThe earth is accessed by H points afterwards.If the ground connection class of fault point G
Type is grounded for non-transient, then control device sends out failure phase transfer instruction to failure phase transfer earthing or grounding means.Failure phase transfer
After earthing or grounding means receives failure phase transfer instruction, the breaker Ka being connected with A phase power transmission lines is closed.At this point, failure phase
Shift the ground resistance R in earthing or grounding meanszWith transition resistance RgIt is connected in parallel, and ground resistance RzWith transition resistance RgIt is grounded.
Due to ground resistance RzWith transition resistance RgIt is connected in parallel, therefore, passes through ground resistance RzWith transition resistance RgElectric current be respectively
Earth current IzWith fault current Ig, and earth current IzWith fault current IgThe sum of be failure residual flow Icc。
Due to ground resistance RzWith transition resistance RgIt is connected in parallel, to make fault current IgOverwhelming majority transfer is ground connection electricity
Flow Iz, according to circuit theory, ground resistance RzResistance value be far smaller than transition resistance RgResistance value, and ground resistance Rz's
Resistance value and transition resistance RgResistance value at least differs an order of magnitude.Such as ground resistance RzResistance value be 1 Ω, then transition electricity
Hinder RgResistance value is at least 10 Ω.At this point, the fault current I generated at the G of fault pointgBasic transfer is earth current Iz.In this Shen
Please be in embodiment, ground resistance RzResistance value be transformation station grounded screen grounding resistance, i.e. 0.5 Ω.
Fault current IgWith earth current IzRelationship be：
Wherein, IgFor fault current；IzFor earth current, RgFor transition resistance, RzFor ground resistance.
By formula (1) it is found that earth current IzWith fault current IgIt is proportional.In the ideal case, earth current Iz
It is zero, at this point, fault current IgIt is compensated entirely.According to circuit theory, fault current IgAlso it is zero.Due to earth current IzWith
Fault current IgIt is zero, therefore, does not have electric current to flow through between 2 points in a circuit loop, as a result, transition resistance RgWith connect
Ground resistance RzBetween potential difference be zero.Due to ground resistance RzGround connection, therefore, ground resistance RzEarth point be ground potential.Together
Sample, fault point G is also ground potential.Since fault point G is ground potential, having personnel to pass through or touch fault point G will not
Cause safety problem.
But earth current I in most caseszIt is not zero, therefore, it is necessary to paid compensation devices to provide negative-phase sequence curent just
It can realize fault current IgFull compensation, i.e., paid compensation device according to be transferred to failure phase transfer earthing or grounding means failure electricity
The failure residual flow that stream output compensates entirely.
Such as attached system shown in Fig. 2 is calculated according to circuital law, can learn system displacement voltage and transition electricity
The relational expression of resistance is：
Wherein, UnIt (measures and learns in real time before being shifted after ground connection) for system displacement voltage；EAFor the busbar electricity of A phase power transmission lines
Pressure (is measured before ground connection and is learnt) in real time；R0It (measures and learns in real time before ground connection) for zero sequence resistance；C0It is relatively capacitance (before ground connection
It measures and learns in real time)；L is the inductance of arc suppression coil in arc suppression coil device；RgFor transition resistance；J is；ω is.
Formula (2) transformation can be obtained：
Due to failure residual flow IccFor earth current IzWith fault current IgThe sum of, therefore, according to formula (1) and formula (3)
It can obtain paid compensation device and realize the output quantity-I compensated entirelyccCalculation formula be：
In the breaker closing by will be connected with failure phase power transmission line, realizing and fault current part is transferred to failure
After phase transfer earthing or grounding means, paid compensation device is by exporting failure residual flow IccInverse value realization the electric current of system is mended entirely
It repays.
If the earthing type of singlephase earth fault occurs to be grounded for instantaneity, control device will not make any instruction,
Failure phase transfer device, arc suppression coil device and paid compensation device will not make any action.
It is suitable for 6-35kV electric power in the full compensation method of the electric current based on singlephase earth fault provided by the embodiments of the present application
The electric current of the singlephase earth fault of system compensates entirely.In the embodiment of the present application, when residual voltage is not located at preset voltage value model
When enclosing interior, that is, when the earthing type that singlephase earth fault occurs is that instantaneity is grounded, by the way that there is Gao Ling to high resistance ground identification
The arc suppression coil device compensation of ground capacitance current of quick property.When residual voltage is located within the scope of preset voltage value, that is, occur single
It, will be in the failure phase transfer earthing or grounding means being mutually connected with failure when the earthing type of phase earth fault is that non-transient is grounded
Breaker closing realizes that fault current switchs to earth current, and then exports the failure residual flow compensated entirely by paid compensation device.
Fault current is switched into the signal that earth current can also carry out tracing compensation using earth current as paid compensation device, to have
The compensation effect for repaying compensation device provides basis for estimation.In addition, earth current can be determined by measuring, and measure easy, nothing
Complicated calculations are needed, so as to ensure that compensation quickly, accurately, improves compensation precision, shields fault point.
Attached drawing 4 is please referred to, attached drawing 4 shows that the electric current provided by the embodiments of the present application based on singlephase earth fault compensates entirely
The structural schematic diagram of system.By attached drawing 4 it is found that the electric current provided by the embodiments of the present application based on singlephase earth fault compensates and is entirely
System includes control device 1, failure phase transfer device 2, arc suppression coil device 3 and paid compensation device 4.
Specifically, control device 1 is electrically connected failure phase transfer device 2, paid compensation device 4 and three-phase power transmission
Line.Wherein, control device 1 is connected with each phase of three phase transmission line, and therefore, control device 1 can acquire three-phase power transmission
Busbar voltage, zero-sequence current and the residual voltage of each phase of line.
In addition, control device 1 can also be realized and judge whether residual voltage is located within the scope of preset voltage value, zero sequence is recorded
Voltage is located at the time within the scope of preset voltage value, determines failure phase power transmission line, judges earthing type and sends out failure phase turn
Move instruction.
Failure phase transfer device 2, arc suppression coil device 3 and paid compensation device 4 are connected in parallel, and therefore, failure phase turns
It is not interfered with each other between moving device 2, arc suppression coil device 3 and paid compensation device 4.Failure phase transfer device 2, arc suppression coil
Device 3 and paid compensation device 4 are respectively connected to each phase of three phase transmission line, and failure phase transfer device 2, arc blowout wire
Coil apparatus 3 and the ground connection setting of paid compensation device 4, therefore, failure phase transfer device 2, arc suppression coil device 3 and paid
Voltage all same residing for compensation device 4.
Failure phase transfer device 2 be used for receive control device 1 send out failure phase transfer instruction when, be closed failure phase turn
Breaker 22 in moving device 2, and then realize connection of the failure phase transfer device 2 between three phase transmission line and the earth, in turn
Convenient for the fault current part in system to be transferred in failure phase transfer earthing or grounding means 2, and then it is transferred to the earth.
Further, failure phase transfer device 2 includes ground resistance 21 and three breakers 22 in parallel, three breakers
22 both ends respectively connect each phase and ground resistance 21 of three phase transmission line, and ground resistance 21 is grounded.Due to three it is disconnected
Road device 22 is connected in parallel, and the both ends of three breakers 22 respectively connect each phase and ground resistance of three phase transmission line
21, therefore, three breakers 22 are orthogonal, and can be realized between power transmission line and the earth respectively by each breaker 22
Connection.
In the embodiment of the present application, arc suppression coil device 3 is preferably arc suppression coil, and paid compensation device 4 is preferably paid
Compensator.
Further, the full compensation system of the electric current of singlephase earth fault provided by the embodiments of the present application further includes ground connection transformation
Device 5, grounding transformer 5 are serially connected between arc suppression coil device 3 and three phase transmission line, and grounding transformer 5 is also serially connected with paid benefit
It repays between device 4 and three phase transmission line.When the setting of grounding transformer 5 can reduce distribution network system generation singlephase earth fault
Capacitive earth current size, and then improve distribution system power supply reliability.
When the earthing type that singlephase earth fault occurs is that instantaneity is grounded, pass through 3 compensation of ground of arc suppression coil device
The mode of capacitance current just can realize the compensation blow-out occurred at singlephase earth fault, and then realize the electric current to electric system
Full compensation.
When the earthing type that singlephase earth fault occurs is that non-transient is grounded, control device 1 connects to failure phase transfer
Ground device 2 sends out failure phase transfer instruction, and failure phase transfer instruction, which is used to indicate, will occur generation at singlephase earth fault
Fault current is shifted.After failure phase transfer earthing or grounding means 2 receives failure phase transfer instruction, by will be mutually defeated with failure
The breaker 22 that electric wire is connected is closed, and realizes fault current part being transferred to failure phase transfer earthing or grounding means 2, at this time system
Failure residual flow include remaining fault current and the earth current for being transferred to failure phase transfer earthing or grounding means 2.When failure electricity
When stream part is transferred to failure phase transfer earthing or grounding means 2, filled by paid compensation device 4 according to failure phase transfer ground connection is transferred to
The fault current for setting 2 exports the failure residual flow compensated entirely.
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or
Say that the part that contributes to existing technology can be expressed in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are used so that computer equipment (can be with
Be personal computer, server either network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Invention described above embodiment is not intended to limit the scope of the present invention..
Those skilled in the art will readily occur to its of the present invention after considering specification and putting into practice the disclosure invented here
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and includes undocumented common knowledge in the art of the invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the invention is not limited in the precision architectures for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of full compensation method of electric current based on singlephase earth fault, which is characterized in that including：
Busbar voltage, zero-sequence current and the residual voltage of three phase transmission line are obtained in real time；
Judge whether the residual voltage is located within the scope of preset voltage value；
If not being located at, arc suppression coil device compensation of ground capacitance current；
If being located at, the time that the residual voltage is located within the scope of the preset voltage value is recorded；
Determine that the three phase transmission line that singlephase earth fault occurs is failure phase power transmission line according to the busbar voltage；
Judge that earthing type, the earthing type include instantaneity ground connection and non-transient ground connection according to the time；
If the earthing type is grounded for the non-transient, control device sends out failure phase transfer instruction, so that failure phase
It shifts earthing or grounding means and controls the failure phase power transmission line ground connection, paid compensation device exports the failure residual flow compensated entirely.
2. according to the method described in claim 1, it is characterized in that, the arc suppression coil device compensation of ground capacitance current packet
It includes：
The earthing capacitance current of system is determined according to the reactance of the zero-sequence current and arc suppression coil device；
It is default whether the difference of the inductive current for judging the arc suppression coil device output and the capacitance current is less than or equal to
Difference, the inductive current are more than the capacitance current；
If the difference of the inductive current and the capacitance current is more than the preset difference value, the arc suppression coil device is adjusted
The inductive current of output, so that the difference of the inductive current and the capacitance current is less than or equal to the preset difference value, and
The inductive current is more than the capacitance current.
3. according to the method described in claim 1, it is characterized in that, judging that earthing type includes according to the time：
Judge whether the time of record is less than preset time；
If more than or be equal to, then the earthing type be non-transient ground connection.
4. according to the method described in claim 1, singlephase earth fault occurs it is characterized in that, being determined according to the busbar voltage
Three phase transmission line be failure phase power transmission line include：
The size for comparing the corresponding busbar voltage of the three phase transmission line determines the busbar voltage pair of voltage value minimum
The three phase transmission line answered is failure phase power transmission line.
5. according to the method described in claim 1, it is characterized in that, the failure phase transfer earthing or grounding means controls the failure phase
Power transmission line is grounded：
The failure phase transfer earthing or grounding means receives the control device and sends out the failure phase transfer instruction, will by breaker
The failure phase power transmission line ground connection.
6. according to the method described in claim 1, it is characterized in that, the calculation formula of the inverse value of the failure residual flow is：
Wherein, IccFor failure residual flow；RgFor transition resistance；RzFor ground resistance；IzFor earth current.
7. according to the method described in claim 1, it is characterized in that, the preset voltage value ranging from 10-60v.
8. a kind of full compensation system of electric current based on singlephase earth fault, which is characterized in that including control device, failure phase transfer
Device, arc suppression coil device and paid compensation device, wherein
The control device is electrically connected the failure phase transfer device, the paid compensation device and three phase transmission line；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are connected in parallel；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are respectively connected to described three
Each phase of phase power transmission line；
The failure phase transfer device, the arc suppression coil device and the paid compensation device are grounded.
9. system according to claim 8, which is characterized in that the failure phase transfer device includes ground resistance and three
The breaker of a parallel connection, the control device are electrically connected each breaker；The both ends of three breakers are divided equally
Each phase of the three phase transmission line and the ground resistance, the ground resistance earth are not connected.
10. system according to claim 8 or claim 9, which is characterized in that the system also includes grounding transformers, described to connect
Ground transformer is serially connected between the arc suppression coil device and the three phase transmission line, and the grounding transformer is also serially connected with described
With compensation between compensation device and the three phase transmission line.
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| CN109873413A (en) * | 2019-04-02 | 2019-06-11 | 云南电网有限责任公司电力科学研究院 | A kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil |
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| CN114725916A (en) * | 2022-05-16 | 2022-07-08 | 河北伟正电力技术有限公司 | Single-phase grounding flexible reverse automatic compensation system and control method thereof |
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