CN110086161A - A kind of magnetism-regulating type arc suppression coil earthing system - Google Patents
A kind of magnetism-regulating type arc suppression coil earthing system Download PDFInfo
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- CN110086161A CN110086161A CN201910542352.2A CN201910542352A CN110086161A CN 110086161 A CN110086161 A CN 110086161A CN 201910542352 A CN201910542352 A CN 201910542352A CN 110086161 A CN110086161 A CN 110086161A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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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Abstract
The present invention discloses a kind of magnetism-regulating type arc suppression coil earthing system, is related to electric network protection technical field；Including monitoring system, adjustable magnetic unit, mutual inductor and magnetism-regulating type arc suppression coil, the residual voltage data and zero-sequence current data of mutual inductor detection power distribution network, and residual voltage data and zero-sequence current data are transported to monitoring system, monitoring system monitors power distribution network operating condition according to residual voltage data and zero-sequence current data, when monitoring system determines that singlephase earth fault has occurred in power grid, signal instruction is sent to adjustable magnetic unit, control the DC current of adjustable magnetic unit injection control coil, zero sequence fluxes size in arc suppression coil is adjusted, to compensate capacitance current of distribution network.
Description
Technical field
The present invention discloses a kind of magnetism-regulating type arc suppression coil earthing system, is related to electric network protection technical field.
Background technique
The medium voltage distribution network in China generallys use small current neutral grounding mode.Singlephase earth fault is occurring for this earthing mode
When can not form short-circuit loop, only in systems generate the lesser zero-sequence current of amplitude, three-phase voltage between lines is still symmetrical, does not influence
On the one hand the normal work of power load, reduces operating cost in this way, on the other hand also improve the same level power supply system can
By property.
But as cable system gradually increases in modern power network, medium voltage distribution network unbalanced earth fault capacitance current sharply increasing
Add, when system capacitive current is greater than 10A, a series of harm can be brought.When intermittent single-phase arc grounding occurs, Yi Yinqi
The electric arc overvoltage of up to 3.5 times phase voltages leads to insulate weakness discharge breakdown and equipment damage.At this point, small current neutral grounding
Power supply system becomes unreliable instead.
Arc suppression coil --- as the term suggests it is exactly the device for eliminating above-mentioned ground arc, is a kind of inductor wire of ribbon core
Circle.It is connected between the neutral point and the earth of transformer (or generator), constitutes arc suppression coil earthing system.When normal operation,
No current passes through in arc suppression coil, and when power grid is struck by lightning or singlephase earth fault occurs, ungrounded voltage relatively
3 times of √ can be increased, neutral point potential will rise to phase voltage, at this moment flow through the inductive current and single-phase earthing of arc suppression coil
Capacitive character fault current is cancelled out each other, and fault current is compensated, and aftercurrent becomes very little, is not enough to pilot arc, from
And self-extinguish.Therefore, the main function of arc suppression coil is: the electric current of fault point is 1. effectively reduced；Restore on voltage 2. mitigating
Lifting speed；3. reducing ferromagnetic resonance probability of happening；4. reducing ground fault expands probability；5. reducing system lightning trip-out rate.
With the continuous development of science and technology, can automatically track now electric network capacitance and current variation, appearance can automatically with
Track compensating arc-extinguishing coil instead of traditional fixed compensation arc suppression coil, it is existing can automatic Following-up Compensation Arc-decreasing Wires, referred to as
For trailing type (presetting system) compensation system, its working principle is that: the variation of electric network capacitance and current is automatically tracked, adjusts extinguishing arc at any time
Coil is kept it in close on resonance point, the series resistance between arc suppression coil and grounding point, increases power grid ratio of damping, will
Resonance overvoltage is limited within the scope of permission.After singlephase earth fault occurs for power grid, resistance is shorted by control system, with
Reach the optimal compensation effect, but the arc suppression coil of trailing type compensation cannot charge on-line tuning, adjusting range is limited big, Wu Fada
To the effect of smooth adjustment, and adjust the problems such as reaction speed is slow.And since the side 6~10kV of China's network transformer is all
Triangle connection, the arc suppression coil of existing structure is generally with the cooperation of grounding transformer, i.e., arc suppression coil is by being grounded transformation
The neutral point and power grid of device, which are connected, to function, and grounding transformer is during compensating capacitor current for earthing, only
The zero sequence inductive capacity for delivering arc suppression coil but consumes the zero load and load loss of two power devices, is unfavorable for energy conservation
Environmental protection, and to occupy installation space big for complete set of equipments, and cost is high.The present invention provides a kind of magnetism-regulating type grounding through arc system
System, grounding transformer and arc suppression coil are combined into one, and form magnetism-regulating type arc suppression coil, earthed system real-time detection bus zero sequence
The operation data of voltage and neutral ground electric current compares judgement according to preset value, when single-phase earthing occurs for power grid
When failure, immediately adjust magnetism-regulating type arc suppression coil zero sequence magnetic circuit magnetic resistance, allow zero sequence inductive current quickly, smooth compensating electricity
Net capacitance current.
Summary of the invention
The present invention be directed to background technique proposition the problem of, a kind of magnetism-regulating type arc suppression coil earthing system is provided, from zero to
The magnetic resistance of the zero sequence magnetic circuit of rated capacity continuous stepless smooth adjustment magnetism-regulating type arc suppression coil, makes zero sequence inductive current quick response
Compensate electric network capacitance and current, it is no longer necessary to which individual grounding transformer so that structure is simple, installation space size is small, and is transported
Row loss is low, and manufacturing cost is low, and operational reliability is high.
Concrete scheme proposed by the present invention is:
A kind of magnetism-regulating type arc suppression coil earthing system, including monitoring system, adjustable magnetic unit, mutual inductor and magnetism-regulating type arc blowout wire
Circle,
Magnetism-regulating type arc suppression coil includes 1 work body and 1 control body,
1 work body includes actuating coil and work iron core, and work iron core is two frame three pillar type iron cores, 3 active lines
Circle is set in 3 iron core columns of work iron core, and the upper terminals of 3 actuating coils are connect with power distribution network bus respectively, and 3
The lower terminals of actuating coil connect earthing pole,
1 control body includes control coil and control iron core, and control iron core is two pillar iron core of single frame, 2 control lines
Circle is set in 2 iron core columns of control iron core, and the inside of every control coil includes independent upper winding and lower winding,
The upper terminals of 2 upper windings are connected in parallel, and the lower terminals of 2 upper windings intersect with the upper terminals of 2 lower windings respectively
It being connected in series, the lower terminals of 2 lower windings are connected in parallel,
Using upper connection iron yoke and lower connection iron yoke and iron core folder assembly connection control iron core and work iron core, 1 is formed
The iron core circuit of a closure is circulated wherein for zero sequence fluxes,
The control coil and monitoring system for controlling body are connected with adjustable magnetic unit respectively, and mutual inductor detects the zero of power distribution network
Sequence voltage and zero sequence current signal are simultaneously transported to monitoring system, and monitoring system is matched according to residual voltage and zero sequence current signal monitoring
Grid operating conditions, the DC current of control adjustable magnetic unit injection control coil, adjust zero sequence fluxes size in arc suppression coil, with
Just capacitance current of distribution network is compensated.
Control coil carries out control wiring with adjustable magnetic unit and leads in a kind of magnetism-regulating type arc suppression coil earthing system
Cross that self-excitation mode is powered or control coil and adjustable magnetic unit carry out control wiring and power by separate excitation mode.
Adjustable magnetic unit includes thyristor T1 and T2 and diode D in a kind of magnetism-regulating type arc suppression coil earthing system,
T1 and T2 refers to thyristor, and D refers to diode,
Control coil and thyristor carry out control wiring and are powered by self-excitation mode, and wherein the anode of T1 and T2 and D is simultaneously
Connection, and the upper terminals of the lower winding of a control coil are connected simultaneously, the cathode of T1 connects the upper winding of the control coil
Centre tap, the cathode of D connects the lower terminals of the upper winding of the control coil, and the cathode of T2 connects another control line
The centre tap of the lower winding of circle；
Or adjustable magnetic unit includes thyristor,
Control coil and thyristor carry out control wiring and are powered by separate excitation mode, on one of control coil around
The lower terminals of group are connected to the positive terminal of thyristor, and the upper terminals of the lower winding of the control coil are connected to crystalline substance
The negative terminal of brake tube.
Monitoring system includes synchronization signal trigger circuit in a kind of magnetism-regulating type arc suppression coil earthing system, monitoring system
System sends a signal to adjustable magnetic unit, the direct current of control adjustable magnetic unit injection control coil by triggering synchronization signal trigger circuit
Stream adjusts zero sequence fluxes size in arc suppression coil.
Mutual inductor includes zero sequential potential transformer and zero-sequence current in a kind of magnetism-regulating type arc suppression coil earthing system
The primary side of mutual inductor, zero sequential potential transformer is connected with power distribution network bus, and the secondary side of zero sequential potential transformer and monitoring are
System connection, the lower terminals that zero sequence current mutual inductor is connected to 3 actuating coils are connected in parallel between place and earthing pole, zero sequence electricity
The secondary side of current transformer is attached with monitoring system.
A kind of tuning methods of magnetism-regulating type arc suppression coil, according to a kind of magnetism-regulating type arc suppression coil earthing system,
Mutual inductor detects the residual voltage and zero sequence current signal of power distribution network, and residual voltage and zero sequence current signal is defeated
Monitoring system is sent to,
Monitoring system monitors power distribution network operating condition according to residual voltage and zero sequence current signal, when monitoring system determines electricity
Singlephase earth fault has occurred in net, sends signal instruction, the direct current of control adjustable magnetic unit injection control coil to adjustable magnetic unit
Stream adjusts zero sequence fluxes size in arc suppression coil, to compensate capacitance current of distribution network.
When adjustable magnetic unit includes that thyristor T1 and T2 and diode D, T1 and T2 refer to thyristor in the tuning methods,
D refers to diode, and control coil carries out control wiring with thyristor and powered by self-excitation mode,
When monitoring system determines that singlephase earth fault has occurred in power grid, monitoring system sends signal instruction to adjustable magnetic unit,
By changing the angle of flow of T1 and T2, the DC current of control adjustable magnetic unit injection control coil adjusts zero sequence in arc suppression coil
Magnetic flux size.
When the residual voltage signal that mutual inductor detects in the tuning methods is more than to threshold value, monitoring system determines electricity
Singlephase earth fault has occurred in net, and the synchronization signal for the residual voltage that monitoring system is provided according to mutual inductor is touched using synchronization signal
The road direction adjustable magnetic unit that generates electricity sends simultaneous phase-shifting signal instruction, controls the angle of flow of thyristor T1 and T2.
The residual voltage and zero sequence current signal of mutual inductor detection power distribution network in the tuning methods, and by residual voltage
It is transported to the analog input end of monitoring system with zero sequence current signal, is stored after A/D is converted, in case call,
When residual voltage number signal is more than to threshold value, monitoring system determines that singlephase earth fault has occurred in power distribution network,
By analog output port, simultaneous phase-shifting signal instruction is sent to adjustable magnetic unit using synchronization signal trigger circuit, control is brilliant
The angle of flow of brake tube T1 and T2 adjust zero sequence fluxes size in arc suppression coil, and magnetism-regulating type arc suppression coil is made to export the corresponding angle of flow
Inductive reactive power electric current.
A kind of magnetism-regulating type arc suppression coil, including 1 work body and 1 control body,
1 work body includes actuating coil and work iron core, and work iron core is two frame three pillar type iron cores, 3 active lines
Circle is set in 3 iron core columns of work iron core, and the upper terminals of 3 actuating coils are connect with power distribution network bus respectively, and 3
The lower terminals of actuating coil connect earthing pole,
1 control body includes control coil and control iron core, and control iron core is two pillar iron core of single frame, 2 control lines
Circle is set in 2 iron core columns of control iron core, and the inside of every control coil includes independent upper winding and lower winding,
The upper terminals of 2 upper windings are connected in parallel, and the lower terminals of 2 upper windings intersect with the upper terminals of 2 lower windings respectively
It being connected in series, the lower terminals of 2 lower windings are connected in parallel,
Using upper connection iron yoke and lower connection iron yoke and iron core folder assembly connection control iron core and work iron core, 1 is formed
The iron core circuit of a closure is circulated wherein for zero sequence fluxes.
Usefulness of the present invention is:
The present invention provides a kind of magnetism-regulating type arc suppression coil earthing system, including monitoring system, adjustable magnetic unit, mutual inductor and tune
Magnetic-type arc suppression coil,
Wherein magnetism-regulating type arc suppression coil and turn-adjusting, adjusting gapped-core type, capacitor tuning type, magnetic biasing type and high-impedance transformer formula extinguishing arc
Coil is compared, and 3 actuating coils are both the primary coil of grounding transformer and the primary coil of arc suppression coil, and zero-sequence current is only
3 actuating coils are flowed through, are no longer flow through other first and second coils, the adjustment of zero-sequence reactance value is by change control iron core magnetic resistance
Mode realize, only mutually interlink on zero sequence magnetic circuit between control coil and actuating coil, then without otherwise electricity
Gas connection, realizes the function and performance that two devices are completed jointly using magnetism-regulating type arc suppression coil of the invention, simplifies biography
1 plus 1 combination configuration mode of system blowout coil set apparatus, equipment volume is small, facilitates installation, can form cabinet type installation knot
Structure can optimize the configuration structure of substation control buildings, while module can be fabricated separately into each component of magnetism-regulating type arc suppression coil, then
Whole assembly and test are carried out, assembling structure is versatile and flexible, reduces manufacturing cost；
Integral ground system of the present invention, using the residual voltage and zero sequence current signal of mutual inductor detection power distribution network, simultaneously
Distribution network failure is monitored using monitoring system, monitoring system can quickly be sent when receiving residual voltage abnormal signal
Adjustable magnetic unit is instructed, the DC current of control adjustable magnetic unit injection control coil adjusts zero sequence magnetic in magnetism-regulating type arc suppression coil
Logical size, makes magnetism-regulating type arc suppression coil export corresponding inductive reactive power electric current, and adjustable range can be put down from zero to any rated capacity
Sliding adjusting is without hindrance, can be realized Millisecond and quickly adjusts；
And magnetism-regulating type arc suppression coil of the invention needed the power device by two equivalent capabilities because of zero-sequence current originally
Part eliminates the loss of a power device now, even if adding the active loss of control section, overall losses are than other classes
It is more that type arc suppression coil reduces 1/3, while adjustable magnetic unit is superimposed the magnetic resistance generated using direct current flux with zero sequence exchange flux
The size of zero sequence exchange flux is controlled, the linearity range of nonlinear ferroelectric core material is made full use of, it is humorous when can by normal load
The ratio high-impedance transformer formula arc suppression coil of wave content, limitation is low, therefore in the present invention in magnetism-regulating type arc suppression coil operational process
It is lost that low, load harmonic content is low.
Detailed description of the invention
Fig. 1 is earthed system schematic diagram of the present invention；
Fig. 2 is the magnetism-regulating type arc suppression coil principle schematic diagram that self-excitation mode is powered in the present invention；
Fig. 3 is the adjustable magnetic unit angle of flow relation schematic diagram that self-excitation mode is powered in the present invention；
Fig. 4 is monitoring system internal module schematic diagram in the present invention；
Fig. 5 is the positive sequence magnetic flux distribution schematic diagram of magnetism-regulating type arc suppression coil in the present invention；
Fig. 6 is the zero sequence fluxes distribution signal that magnetism-regulating type arc suppression coil when singlephase earth fault occurs for power distribution network in the present invention
Figure；
Fig. 7 is the zero sequence fluxes and direct current flux distribution schematic diagram that magnetism-regulating type arc suppression coil is adjusted in the present invention；
Fig. 8 is the adjustable magnetic unit and magnetism-regulating type arc suppression coil connection schematic diagram that separate excitation mode is powered in the present invention.
Appended drawing reference:
1. zero sequential potential transformer (TV0), 2. magnetism-regulating type arc suppression coils, 3. zero sequence current mutual inductors (TA0), 4. work iron
Core, 6. monitoring systems, 7. adjustable magnetic unit, iron yoke is connected on 8., 9. lower connection iron yokes, 10. is connect with C bus 5. control iron cores
Actuating coil, 11. actuating coil, 12. actuating coil, 13. control coils one being connect with B bus being connect with A-bus
Upper winding, the upper winding of 14. control coils two, the lower winding of 15. control coils one, 16. control coils two lower winding.
Specific embodiment
The present invention provides a kind of magnetism-regulating type arc suppression coil earthing system, including monitoring system, adjustable magnetic unit, mutual inductor and tune
Magnetic-type arc suppression coil,
Magnetism-regulating type arc suppression coil includes 1 work body and 1 control body,
1 work body includes actuating coil and work iron core, and work iron core is two frame three pillar type iron cores, 3 active lines
Circle is set in 3 iron core columns of work iron core, and the upper terminals of 3 actuating coils are connect with power distribution network bus respectively, and 3
The lower terminals of actuating coil connect earthing pole,
1 control body includes control coil and control iron core, and control iron core is two pillar iron core of single frame, 2 control lines
Circle is set in 2 iron core columns of control iron core, and the inside of every control coil includes independent upper winding and lower winding,
The upper terminals of 2 upper windings are connected in parallel, and the lower terminals of 2 upper windings intersect with the upper terminals of 2 lower windings respectively
It being connected in series, the lower terminals of 2 lower windings are connected in parallel,
Using upper connection iron yoke and lower connection iron yoke and iron core folder assembly connection control iron core and work iron core, 1 is formed
The iron core circuit of a closure is circulated wherein for zero sequence fluxes,
The control coil and monitoring system for controlling body are connected with adjustable magnetic unit respectively, and mutual inductor detects the zero of power distribution network
Sequence voltage and zero sequence current signal are transported to monitoring system, and monitoring system monitors distribution according to residual voltage and zero sequence current signal
Net operating condition, the DC current of control adjustable magnetic unit injection control coil, adjusts zero sequence fluxes size in arc suppression coil, so as to
Dynamic compensation capacitance current of distribution network.
A kind of tuning methods of magnetism-regulating type arc suppression coil corresponding with above system are provided simultaneously, according to described one kind
Magnetism-regulating type arc suppression coil earthing system,
Mutual inductor detects the residual voltage and zero sequence current signal of power distribution network, and residual voltage and zero sequence current signal is defeated
Monitoring system is sent to,
Monitoring system monitors power distribution network operating condition according to residual voltage and zero sequence current signal, when monitoring system determines electricity
Singlephase earth fault has occurred in net, sends signal instruction, the direct current of control adjustable magnetic unit injection control coil to adjustable magnetic unit
Stream adjusts zero sequence fluxes size in arc suppression coil, dynamically to compensate capacitance current of distribution network.
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Monitoring system in the present invention can be individual computer and its server system, be also possible to server set
Group system or Cabinet-type server system etc..
In this embodiment, magnetism-regulating type arc suppression coil earthing system includes monitoring system 6, adjustable magnetic unit 7, mutual inductor and tune
Magnetic-type arc suppression coil 2,
Monitoring system 6 is computer server system, be can refer in Fig. 1, the composition of monitoring system 6, and mutual inductor includes zero
The primary side of sequence voltage mutual inductor TV0 and zero sequence current mutual inductor TA0, zero sequential potential transformer TV0 are connected with power distribution network bus,
Secondary side is attached with monitoring system, and zero sequence current mutual inductor TA0 is connected to the lower terminals of 3 actuating coil 10-12 simultaneously
At connection between earthing pole N, secondary side is attached with monitoring system 6；
Magnetism-regulating type arc suppression coil 2 includes 1 work body and 1 control body,
1 work body include actuating coil 10-12 and work iron core 4, work iron core 4 be two frame three pillar type iron cores, 3
Actuating coil 10-12 is set in 3 iron core columns of work iron core 4, the upper terminals difference of 3 actuating coil 10-12
It being connect with power distribution network bus, the lower terminals of 3 actuating coil 10-12 connect earthing pole N,
1 control body includes control coil and control iron core 5, and control iron core 5 is two pillar iron core of single frame, 2 controls
Coil be set in control iron core 52 iron core columns on, the inside of every control coil include independent upper winding and under around
The upper terminals of group, 2 upper windings 13 and 14 are connected in parallel, the lower terminals of 2 upper windings 13 and 14 respectively with 2 lower windings
15 and 16 upper terminals, which intersect, to be connected in series, and two are connected in series the upper terminals D1 and upper winding that point is respectively lower winding 15
13 lower terminals D2, the lower terminals of 2 lower windings 15 and 16 are connected in parallel, and the centre tap of upper winding 13 is K1, under around
The centre tap of group 16 is that tap the number of turns of K2, K1 and D2 are identical as tap the number of turns of K2 and D2,
Utilize upper connection iron yoke 8 and lower connection iron yoke 9 and iron core folder assembly connection control iron core 5 and work iron core 4, shape
The iron core circuit being closed at 1, circulates wherein for zero sequence fluxes,
Adjustable magnetic unit 7 includes thyristor T1 and T2 and diode D, and control coil carries out control wiring with thyristor and passes through
Self-excitation mode is powered, and wherein the anode of T1 and T2 and D is in parallel, and connects the end D1 of magnetism-regulating type arc suppression coil 2, the cathode of T1 simultaneously
The end K1 of magnetism-regulating type arc suppression coil 2 is connect, the cathode of D connects the end D2 of magnetism-regulating type arc suppression coil 2, and the cathode of T2 connects magnetism-regulating type arc blowout wire
The end K2 of circle 2, the trigger electrode of thyristor T1 and T2 are connected respectively to the corresponding wiring terminal of pulse amplified shaping circuit PCB,
The lock-out pulse trigger circuit of monitoring system 6 can be touched by the way that the isolated transmissions such as optical fiber or Isolated Pulse Transformer are synchronous
The pulse amplified shaping circuit PCB of pulse signal to adjustable magnetic unit 7 is sent out,
When earthed system of the present invention is run, using zero sequential potential transformer TV0 and zero sequence current mutual inductor TA0, detection is matched
The residual voltage U0 and zero-sequence current I0 of network voltage bus are transported to the analog input end of monitoring system 6, and turn through A/D
These real-time data memories change commanders in the memory of central processing unit, is called for computer program or other peripheral equipments, when
When residual voltage U0 is more than to threshold value, monitoring system 6 determines that singlephase earth fault has occurred in power grid, and startup separator handles journey
Sequence is transmitted to by the simultaneous phase-shifting signal instruction that the lock-out pulse trigger circuit of analog output port is formed positioned at high potential
The pulse amplified shaping circuit of the adjustable magnetic unit 7 at end controls the angle of flow of thyristor T1 and T2, keeps magnetism-regulating type arc suppression coil 2 defeated
The inductive reactive power electric current for corresponding to the angle of flow out, when power distribution network ground capacity changes, monitoring system 6 changes 2 crystalline substances at any time
The angle of flow of brake tube, dynamic compensate the capacity current of one-phase earthing failure in electric distribution network point, make the control of its aftercurrent in minimum model
Within enclosing；
And when power distribution network operates normally, it is separate with earthed system ground capacity resonance point at, by continuously changing T1
With the angle of flow of T2, so that it may which the numerical value for detecting, saving residual voltage U01, U02 and zero-sequence current I01 and I02 respectively utilizes prison
Power distribution network real-time capacitance Σ C over the ground is calculated in control system 6, when so that singlephase earth fault occurs, according to preservation
The numerical value of residual voltage U01, U02 and zero-sequence current I01 and I02 transfer direct-to-ground capacitance value Σ C, quickly adjust magnetism-regulating type extinguishing arc
Coil 2 exports the inductive reactive power electric current of the corresponding angle of flow.
When power distribution network operates normally, the voltage on 3 actuating coil 10-12 windings only has positive-sequence component not have zero sequence point
Amount, due to the magnetic resistance very little for the iron core 4 that works, the reactance of 3 actuating coil 10-12 is very big, forward-order current very little, and size phase
Deng, 120 ° of phase mutual deviation, vector sum zero.Generated positive sequence magnetic flux be also it is equal in magnitude, 120 ° of phase mutual deviation, work iron
Access each other in 3 iron core columns of core 4；
When singlephase earth fault occurs for power distribution network, the voltage being added on 3 actuating coil 10-12 can be decomposed and is positive
Order components and zero-sequence component.It is identical when forward-order current and positive sequence magnetic flux and normal power grid that positive-sequence component voltage generates.And
The zero-sequence current that zero-sequence component voltage generates flows into the winding of 3 actuating coil 10-12, and equal in magnitude, phase is consistent, produced
Zero sequence fluxes it is equal in magnitude, direction is also identical, can only flow through zero sequence magnetic circuit iron core formation closed circuit.And due to zero sequence
Magnetic circuit iron core does not have an air gap, and initial inductance also very little, the zero-sequence reactance of 3 actuating coils is also very big, and initial zero-sequence current is several
It is zero.When the voltage upper end induced in 4 winding 13-16 of 2 control coils is positive polarity chron, T1 anode is also anode
Property, T1 is triggered conducting at this time.DC current will be generated respectively in upper winding 13-14, lower winding 15-16, in their effect
Under make control iron core 5 an iron core column increase another iron core column of magnetic subtract magnetic, the magnetic resistance equivalent to increase two iron core columns.Instead
It, when the voltage lower end induced in 4 winding 13-16 of 2 control coils is positive polarity chron, T2 is triggered conducting, equally
So that an iron core column is increased another iron core column of magnetic and subtracts magnetic.Under the action of alternating voltage, makes T1, T2 synchronous conducting in turn, formed
Single-phase full-wave rectifer circuit.At this point, changing the size of T1, T2 angle of flow, the size of DC excitation electric current is exactly changed,
The magnetic saturation degree for changing control iron core, has adjusted the magnetic resistance size of zero sequence magnetic circuit, and zero in 3 actuating coil 10-12
Sequence inductive current has obtained smooth step-less adjustment.In T1, T2 cut-off, zero-sequence reactance is very big, and zero-sequence current very little is no better than
Zero, when T1, T2 are connected entirely, control iron core is saturated entirely, and zero-sequence reactance very little, zero sequence inductive current is maximum, is equal to rated value,
Adjust control range be equal to zero arrive rated capacity, therefore in the present invention magnetism-regulating type arc suppression coil 2 compensation adjustment range it is wide.
Magnetic flux distribution of the magnetism-regulating type arc suppression coil 2 before and after singlephase earth fault occurs for power distribution network, which is shown in, can refer to Fig. 5 and Fig. 6
Shown, there is no when singlephase earth fault, the magnetic flux to work in iron core is identical as common transformer iron core, A phase iron for power distribution network
Stem and the magnetic flux in C phase iron core column, exactly by being vertically connected with iron yoke 8 and 9, in the iron yoke crosspoint of B phase iron core column, formation is closed
The magnetic flux of magnetic circuit is closed, only phase is different, and all instantaneous, the algebraical sum of three-phase magnetic flux is always equal to zero, it may be assumed that
When singlephase earth fault occurs for power distribution network, the electricity being added on actuating coil 10-12 is reflected since magnetic flux is practical
Size and phase relation are pressed, can derive following calculation formula:
With the magnetic flux of 3 iron core column coil intersecting chains, it is also segmented into positive sequence magnetic fluxWith zero sequence magnetic
It is logicalWherein positive sequence magnetic flux is equal in magnitude, and 120 ° of phase mutual deviation, vector sum zero, at 3 of work iron core 4
It circulates between iron core column, without zero sequence magnetic circuit iron core.Zero sequence fluxes are equal in magnitude, and phase directional is essentially identical, pass through zero sequence
Magnetic circuit iron core forms closed circuit.
Shown in Fig. 7 when control coil is not passed through DC current, forward-sequence reactance and zero-sequence reactance are all very big, pass through 3
Forward-order current and zero-sequence current all very littles of actuating coil 10-12.When control coil is passed through DC current, in zero sequence magnetic circuit
DC excitation magnetic flux Φ has been superimposed in iron coreDC, wherein the magnetic flux in 1 iron core column isIn another 1 iron core column
Magnetic flux beTo zero sequence fluxesFor be equal to the magnetic resistance for increasing its magnetic circuit, at this point, zero sequence magnetic circuit iron
The zero sequence fluxes of in-core are reducing, and the zero sequence leakage magnetic flux of 3 actuating coil 10-12 windings is increasing, and zero sequence leakage reactance is reducing,
Zero sequence inductive current is increasing, until reaching the given value of monitoring system 6, realizes the functional requirement of dynamic type compensation system.
Magnetic cell 7 is exchanged using monitoring system 6 in above-described embodiment to be controlled, and the angle of flow of thyristor is changed, although
Thyristor works in high potential, but its voltage for controlling power supply is very low, and trigger signal is transmitted to high potential crystalline substance using optical fiber
Brake tube triggers pcb board, not only it is isolated with low potential, but also improve anti-interference ability, the on-load voltage regulation with traditional turn-adjusting is opened
Pass, capacitor switching switch of capacitor tuning type etc. adjust control mode and compare, and not only simply, operational reliability also obtains substance
Promotion.
According to above-described embodiment, in the present invention, adjustable magnetic unit 7 and control coil carry out control wiring can also be by separate excitation side
Formula is powered, and winding 13 and 14 and lower winding 15 and 16 on control coil intersect concatenated two nodes among them and be separately connected
To the positive and negative electrode connecting terminal of the thyristor of adjustable magnetic unit 7, the mode of connection and external incoming power inside adjustable magnetic unit 7
Relating to parameters, the external power supply can be from work of the present invention either the isolation control power supply from external transformer
The second siding ring winding of body can specifically be arranged that the IGBT group pole of adjustable magnetic unit 7 is connected to as the case may be
The corresponding wiring terminal of pulse amplified shaping circuit PCB,
The lock-out pulse trigger circuit of monitoring system 6 can be touched by the way that the isolated transmissions such as optical fiber or Isolated Pulse Transformer are synchronous
The pulse amplified shaping circuit PCB of pulse signal to adjustable magnetic unit 7 is sent out,
When earthed system of the present invention is run, using zero sequential potential transformer TV0 and zero sequence current mutual inductor TA0, detection is matched
The residual voltage U0 and zero-sequence current I0 of network voltage bus are transported to the analog input end of monitoring system 6, and turn through A/D
These real-time data memories change commanders in the memory of central processing unit, is called for computer program or other peripheral equipments, when
When residual voltage U0 is more than to threshold value, monitoring system 6 determines that singlephase earth fault has occurred in power grid, and startup separator handles journey
Sequence is transmitted to by the simultaneous phase-shifting signal instruction that the lock-out pulse trigger circuit of analog output port is formed positioned at high potential
The pulse amplified shaping circuit of the adjustable magnetic unit 7 at end controls turn on thyristors angle, leads the output correspondence of magnetism-regulating type arc suppression coil 2
The inductive reactive power electric current of current flow angle, when power distribution network ground capacity changes, monitoring system 6 changes the conducting of thyristor at any time
Angle, dynamic compensate the capacity current of one-phase earthing failure in electric distribution network point, make the control of its aftercurrent within minimum zone.And
When power distribution network operates normally, it is separate with earthed system ground capacity resonance point at, pass through the angle of flow of continuous thyristor, so that it may
The numerical value for detecting, saving residual voltage U01, U02 and zero-sequence current I01 and I02 respectively, can be calculated using monitoring system 6
Power distribution network real-time capacitance Σ C over the ground, when so that singlephase earth fault occurs, according to residual voltage U01, U02 of preservation and zero
The numerical value of sequence electric current I01 and I02 transfer direct-to-ground capacitance value Σ C, quickly adjust magnetism-regulating type arc suppression coil 2 and export the corresponding angle of flow
Inductive reactive power electric current.
Flux change and curent change are identical as previous embodiment principle analysis in magnetism-regulating type arc suppression coil 2.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of magnetism-regulating type arc suppression coil earthing system, it is characterized in that
Including monitoring system, adjustable magnetic unit, mutual inductor and magnetism-regulating type arc suppression coil,
Magnetism-regulating type arc suppression coil includes 1 work body and 1 control body,
1 work body includes actuating coil and work iron core, and work iron core is two frame three pillar type iron cores, 3 actuating coils point
It is not sleeved in 3 iron core columns of work iron core, the upper terminals of 3 actuating coils are connect with power distribution network bus respectively, 3 works
Make the lower terminals connection earthing pole of coil,
1 control body includes control coil and control iron core, and control iron core is two pillar iron core of single frame, 2 control coils point
It not being sleeved in 2 iron core columns of control iron core, the inside of every control coil includes independent upper winding and lower winding, and 2
The upper terminals of upper winding are connected in parallel, and the lower terminals of 2 upper windings intersect series connection with the upper terminals of 2 lower windings respectively
Connection, the lower terminals of 2 lower windings are connected in parallel,
Using upper connection iron yoke and lower connection iron yoke and iron core folder assembly connection control iron core and work iron core, forms 1 and close
The iron core circuit of conjunction is circulated wherein for zero sequence fluxes,
The control coil and monitoring system for controlling body are connected with adjustable magnetic unit respectively, and mutual inductor detects the zero sequence electricity of power distribution network
Pressure and zero sequence current signal are simultaneously transported to monitoring system, and monitoring system monitors power distribution network according to residual voltage and zero sequence current signal
Operating condition, the DC current of control adjustable magnetic unit injection control coil, adjusts zero sequence fluxes size in arc suppression coil, to mend
Repay capacitance current of distribution network.
2. a kind of magnetism-regulating type arc suppression coil earthing system according to claim 1, it is characterized in that control coil and adjustable magnetic list
Member carries out control wiring and is powered by self-excitation mode or control coil and adjustable magnetic unit carry out control wiring and pass through separate excitation side
Formula power supply.
3. a kind of magnetism-regulating type arc suppression coil earthing system according to claim 2, it is characterized in that adjustable magnetic unit includes brilliant lock
Pipe T1 and T2 and diode D, T1 and T2 refer to thyristor, and D refers to diode,
Control coil carries out control wiring with thyristor and is powered by self-excitation mode, and wherein the anode of T1 and T2 and D is in parallel, and
The upper terminals of the lower winding of a control coil are connected simultaneously, and the cathode of T1 connects the centre of the upper winding of the control coil
Tap, the cathode of D connect the lower terminals of the upper winding of the control coil, and the cathode of T2 connects under another control coil
The centre tap of winding；
Or adjustable magnetic unit includes thyristor,
Control coil carries out control wiring with thyristor and is powered by separate excitation mode, the upper winding of one of control coil
Lower terminals are connected to the positive terminal of thyristor, and the upper terminals of the lower winding of the control coil are connected to thyristor
Negative terminal.
4. a kind of magnetism-regulating type arc suppression coil earthing system according to claim 1 or 3, it is characterized in that monitoring system includes same
Signal trigger circuit is walked, monitoring system sends a signal to adjustable magnetic unit by triggering synchronization signal trigger circuit, controls adjustable magnetic list
The DC current of member injection control coil, adjusts zero sequence fluxes size in arc suppression coil.
5. a kind of magnetism-regulating type arc suppression coil earthing system according to claim 1 to 4, it is characterized in that mutual inductor includes
The primary side of zero sequential potential transformer and zero sequence current mutual inductor, zero sequential potential transformer is connected with power distribution network bus, zero sequence electricity
The secondary side of pressure mutual inductor is connect with monitoring system, and the lower terminals that zero sequence current mutual inductor is connected to 3 actuating coils are in parallel
Between junction and earthing pole, secondary side and the monitoring system of zero sequence current mutual inductor are attached.
6. a kind of tuning methods of magnetism-regulating type arc suppression coil, it is characterized in that -5 any a kind of adjustable magnetic according to claim 1
Formula arc suppression coil earthing system,
Mutual inductor detects the residual voltage and zero sequence current signal of power distribution network, and residual voltage and zero sequence current signal are transported to
Monitoring system,
Monitoring system monitors power distribution network operating condition according to residual voltage and zero sequence current signal, when monitoring system determines power grid hair
Singlephase earth fault has been given birth to, has sent signal instruction to adjustable magnetic unit, the DC current of control adjustable magnetic unit injection control coil is adjusted
Zero sequence fluxes size in arc suppression coil is saved, to compensate capacitance current of distribution network.
7. tuning methods according to claim 6, it is characterized in that when adjustable magnetic unit includes thyristor T1 and T2 and diode
D, T1 and T2 refer to thyristor, and D refers to diode, and control coil carries out control wiring with thyristor and supplied by self-excitation mode
Electricity,
When monitoring system determines that singlephase earth fault has occurred in power grid, monitoring system sends signal instruction to adjustable magnetic unit, passes through
Change the angle of flow of T1 and T2, the DC current of control adjustable magnetic unit injection control coil adjusts zero sequence fluxes in arc suppression coil
Size.
8. tuning methods according to claim 7, it is characterized in that the residual voltage signal of mutual inductor detection is more than to fixed limit
When value, monitoring system determines that power grid has occurred singlephase earth fault, the residual voltage that monitoring system is provided according to mutual inductor it is same
It walks signal and sends simultaneous phase-shifting signal instruction to adjustable magnetic unit using synchronization signal trigger circuit, control thyristor T1's and T2 leads
Current flow angle.
9. tuning methods according to claim 8, it is characterized in that the residual voltage and zero sequence electricity of mutual inductor detection power distribution network
Signal is flowed, and residual voltage and zero sequence current signal are transported to the analog input end of monitoring system, is deposited after A/D is converted
Storage, in case call,
When residual voltage number signal is more than to threshold value, monitoring system determines that singlephase earth fault has occurred in power distribution network, passes through
Analog output port sends simultaneous phase-shifting signal instruction to adjustable magnetic unit using synchronization signal trigger circuit, controls thyristor
The angle of flow of T1 and T2 adjusts zero sequence fluxes size in arc suppression coil, and magnetism-regulating type arc suppression coil is made to export the sense of the corresponding angle of flow
Property reactive current.
10. a kind of magnetism-regulating type arc suppression coil, it is characterized in that including 1 work body and 1 control body,
1 work body includes actuating coil and work iron core, and work iron core is two frame three pillar type iron cores, 3 actuating coils point
It is not sleeved in 3 iron core columns of work iron core, the upper terminals of 3 actuating coils are connect with power distribution network bus respectively, 3 works
Make the lower terminals connection earthing pole of coil,
1 control body includes control coil and control iron core, and control iron core is two pillar iron core of single frame, 2 control coils point
It not being sleeved in 2 iron core columns of control iron core, the inside of every control coil includes independent upper winding and lower winding, and 2
The upper terminals of upper winding are connected in parallel, and the lower terminals of 2 upper windings intersect series connection with the upper terminals of 2 lower windings respectively
Connection, the lower terminals of 2 lower windings are connected in parallel,
Using upper connection iron yoke and lower connection iron yoke and iron core folder assembly connection control iron core and work iron core, forms 1 and close
The iron core circuit of conjunction is circulated wherein for zero sequence fluxes.
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| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN110927516A (en) * | 2019-11-14 | 2020-03-27 | 长沙理工大学 | Power distribution network single-phase earth fault identification method and system based on grounding transformer tap grounding |
| WO2020161387A1 (en) * | 2019-02-04 | 2020-08-13 | Ensto Oy | Apparatus and method for operating arc suppression coil |
| WO2020161388A1 (en) * | 2019-02-04 | 2020-08-13 | Ensto Oy | Arc suppression coil and method for grounding |
| CN113067318A (en) * | 2021-04-01 | 2021-07-02 | 河北旭辉电气股份有限公司 | Pre-adjusting phase-control arc extinction control method |
| 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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| 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 |
| CN114725916B (en) * | 2022-05-16 | 2024-07-09 | 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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