CN110148931A - Arc suppression coil parallel low-resistance grounding device and control method - Google Patents
Arc suppression coil parallel low-resistance grounding device and control method Download PDFInfo
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- CN110148931A CN110148931A CN201910486431.6A CN201910486431A CN110148931A CN 110148931 A CN110148931 A CN 110148931A CN 201910486431 A CN201910486431 A CN 201910486431A CN 110148931 A CN110148931 A CN 110148931A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses an arc suppression coil parallel low-resistance grounding device and a control method, wherein the device comprises: the device comprises an arc suppression coil device, a grounding transformer, a low-resistance grounding resistor, a low-resistance fling-cut switch and a controller; the three-phase input end of the grounding transformer is connected with a power grid, and the output end of the grounding transformer is connected with the input end of the arc suppression coil device and the first end of the low-resistance fling-cut switch; the second end of the low-resistance switching switch is connected with the first end of the low-resistance grounding resistor; the output end of the arc suppression coil device and the second end of the low-resistance grounding resistor are grounded; the controller is connected with the control end of the low-resistance switching switch and used for identifying the fault point transition resistance and the transition resistance, controlling the switching of the low-resistance grounding resistor and controlling the compensation of the arc suppression coil according to the fault point transition resistance and the critical transition resistance; through discerning fault point transition resistance, whether control low resistance earth resistor throw-in again can realize the low resistance function of many times throw-in and throw-in again, satisfies actual fault operating mode requirement.
Description
Technical field
The present invention relates to arc suppression coil parallel connection low resistance earthing technical field more particularly to a kind of arc suppression coil low electricity in parallel
Hinder earthing or grounding means and control method.
Background technique
In the power system, neutral grounding mode be according to the size of the dielectric level of grid equipment, capacitance current come
Selection.For the power distribution network based on overhead line, neutral by arc extinction coil grounding mode is generally used；For with cable
Urban power distribution network based on road, singlephase earth fault capacitance current is biggish, mostly uses Neutral Point Through Low Resistance mode.But
It is that neutral by arc extinction coil grounding mode brings certain difficulty to permanent fault route selection, it is difficult to quickly and accurately cut off
Failure；Transient earthing failure and permanent earth fault cannot be distinguished in Neutral Point Through Low Resistance mode, single-phase connects to all
Ground starts line tripping, increases line tripping number, affects power supply reliability.Using arc suppression coil parallel low resistance
The advantages of neutral flexible grounding mode can eliminate transient fault in conjunction with arc suppression coil, small resistance quickly isolates both permanent faults,
It solves the problems, such as to be individually present, greatly improves the Supply Security and reliability of power distribution network.Arc suppression coil parallel low resistance at present
Neutral flexible grounding control device succeeded in developing, generally try out in China, achieve good result.
But currently, the working principle of arc suppression coil parallel connection low-resistance grounding device there is also certain deficiencies, mainly such as
Failure does not disappear after fruit low resistance earthing resistor investment, then arc suppression coil will continue to compensation certain time (general < 2h), and
If compensate the interior failure point range expansion of time range or fault point ground connection transition resistance reduction, arc suppression coil parallel connection low resistance
Earthing or grounding means can't put into low resistance earthing resistor isolated fault again, can not handle physical fault operating condition.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of arc suppression coil parallel connection low-resistance grounding device and controls
Method can be realized multiple switching low resistance function, meet physical fault working condition requirement.
In a first aspect, the embodiment of the invention provides a kind of arc suppression coil parallel connection low-resistance grounding devices, comprising: arc blowout wire
Coil apparatus, grounding transformer, low resistance earthing resistor, low resistance fling-cut switch and controller；The grounding transformer
Three-phase input end is the input terminal of the output end of the grounding transformer and the arc suppression coil device, described for accessing power grid
The first end of low resistance fling-cut switch connects；The second end of the low resistance fling-cut switch and the low resistance earthing resistor
First end connection；The second end ground connection of the output end of the arc suppression coil device, the low resistance earthing resistor；The control
Device is connect with the control terminal of the low resistance fling-cut switch, for identification fault point transition resistance and critical transition resistance, and
The throwing of the low resistance earthing resistor is controlled with the critical transition resistance according to the fault point transition resistance, cuts and controls
Arc suppression coil processed compensates.
Preferably, the grounding transformer is the three-winding transformer of Y type wiring, wherein in the grounding transformer
Property point is connect with the input terminal of the arc suppression coil device.
Preferably, the arc suppression coil parallel connection low-resistance grounding device further includes the first voltage connecting with the controller
Mutual inductor, second voltage mutual inductor；The first voltage mutual inductor is for accessing power grid bus, for measuring singlephase earth fault
The phase voltage of phase；The second voltage mutual inductor connects the defeated of neutral point in the grounding transformer and the arc suppression coil device
Enter between end, the voltage at neutral point for detecting the grounding transformer.
Preferably, the arc suppression coil parallel connection low-resistance grounding device further includes the Current Mutual Inductance connecting with the controller
Device, the current transformer are connected to the branch road of the arc suppression coil device, for detecting the arc suppression coil device compensation
When compensation electric current.
Compared with the existing technology, the beneficial effect of the embodiment of the present invention is:
The arc suppression coil parallel connection low-resistance grounding device, comprising: arc suppression coil device, grounding transformer, low resistance connect
Ground resistance device, low resistance fling-cut switch and controller；The three-phase input end of the grounding transformer is described for accessing power grid
The output end of grounding transformer is connect with the first end of the input terminal of the arc suppression coil device, the low resistance fling-cut switch；
The second end of the low resistance fling-cut switch is connect with the first end of the low resistance earthing resistor；The arc suppression coil device
Output end, the low resistance earthing resistor second end ground connection；The control of the controller and the low resistance fling-cut switch
End processed connection, fault point transition resistance and transition resistance control for identification, and according to the fault point transition resistance and
The critical transition resistance controls the throwing of the low resistance earthing resistor, cuts；By the fault point transition resistance that identifies with
And transition resistance, the low resistance earthing resistor whether again switching is controlled, can be realized multiple switching low resistance function, it is full
Full border fault condition requirement.
Second aspect, the embodiment of the invention provides a kind of control method of arc suppression coil parallel connection low-resistance grounding device,
Using the described in any item arc suppression coil parallel connection low-resistance grounding devices of such as first aspect, comprising the following steps:
Controller controls low resistance earthing resistor switching；
It is mutual to obtain first voltage mutual inductor detects after the low resistance earthing resistor is put into phase voltage, second voltage
Voltage at the neutral point that sensor detects, the direct-to-ground capacitance for the power grid outlet that arc suppression coil device detects；
It obtains the low resistance earthing resistor and exits the compensation electric current that rear current transformer detects；
According to voltage, compensation electric current and direct-to-ground capacitance at the phase voltage, neutral point, fault point transition resistance is calculated；
According to voltage, compensation electric current and the direct-to-ground capacitance, meter at preset route zero-sequenceprotection setting valve, neutral point
Calculate critical transition resistance；
According to the fault point transition resistance and the critical transition resistance, judge whether low resistance described in switching again
Grounding resistor；
When the transition resistance is not more than the critical transition resistance, controls the low resistance earthing resistor and throw again
It cuts.
Preferably, described according to voltage, compensation electric current and direct-to-ground capacitance at the phase voltage, neutral point, calculate failure
Point transition resistance, specifically includes:
According to voltage, compensation electric current at the neutral point, arc suppression coil inductance is calculated；
According to voltage, compensation electric current, direct-to-ground capacitance at the neutral point, the faulty line during arc suppression coil compensation is calculated
Zero-sequence current；
According to the phase voltage, arc suppression coil inductance, faulty line zero-sequence current, direct-to-ground capacitance, fault point transition is calculated
Resistance.
Preferably, described according to voltage at preset route zero-sequenceprotection setting valve, neutral point, compensation electric current and described
Direct-to-ground capacitance calculates critical transition resistance, specifically includes:
According to formula (1), critical transition resistance is calculated；
Wherein, w=2 π f=314rad/s, L are arc suppression coil inductance, and C is the direct-to-ground capacitance, and R is that the low resistance connects
The resistance value of ground resistance device, IzFor preset route zero-sequenceprotection setting valve, UxFor the phase voltage.
Preferably, described according to voltage, compensation electric current at the neutral point, arc suppression coil inductance is calculated, is specifically included:
According to formula (2), arc suppression coil inductance is calculated；
Wherein, U0For voltage at neutral point, ILTo compensate electric current.
Preferably, described according to voltage, compensation electric current, direct-to-ground capacitance at the neutral point, calculate the arc suppression coil compensation phase
Between faulty line zero-sequence current, specifically include:
According to formula (3), the faulty line zero-sequence current during arc suppression coil compensation is calculated.
Preferably, described according to the phase voltage, arc suppression coil inductance, faulty line zero-sequence current, direct-to-ground capacitance, it calculates
Fault point transition resistance, specifically includes:
According to formula (4), fault point transition resistance is calculated.
Compared with the existing technology, the beneficial effect of the embodiment of the present invention is:
The control method of the arc suppression coil parallel connection low-resistance grounding device, by being thrown in the low resistance earthing resistor
After entering and exiting, fault point transition resistance R is monitoredf, and work as fault point transition resistance Rf≤ critical transition resistance Rz, then device is again
Secondary investment low resistance earthing resistor, to cut off faulty line；As fault point transition resistance RfThe critical transition resistance R of >z, then fill
It sets and does not put into low resistance earthing resistor, be maintained at arc suppression coil compensation state, can be avoided in compensation time range for some reason
When hindering point range expansion or fault point ground connection transition resistance reduction, traditional arc suppression coil parallel connection low-resistance grounding device can't be again
The problem of secondary investment low resistance earthing resistor isolated fault, it can effectively cut off faulty line.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in embodiment will be made below
Simply introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram for the arc suppression coil parallel connection low-resistance grounding device that first embodiment of the invention provides；
Fig. 2 is the process of the control method for the arc suppression coil parallel connection low-resistance grounding device that second embodiment of the invention provides
Figure；
Fig. 3 is line fault schematic diagram；
Fig. 4 is singlephase earth fault equivalent circuit diagram after low resistance earthing resistor investment；
Fig. 5 is that low resistance earthing resistor exits rear singlephase earth fault equivalent circuit diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, first embodiment of the invention provides a kind of arc suppression coil parallel connection low-resistance grounding device, comprising:
Arc suppression coil device L, grounding transformer 1, low resistance earthing resistor R, low resistance fling-cut switch K and controller 2；It is described to connect
The three-phase input end of ground transformer 1 is for accessing power grid, the output end of the grounding transformer 1 and the arc suppression coil device L
Input terminal, the low resistance fling-cut switch first end connection；The second end of the low resistance fling-cut switch and the low electricity
Hinder the first end connection of grounding resistor R；The of the output end of the arc suppression coil device L, the low resistance earthing resistor R
Two ends ground connection；The controller 2 is connect with the control terminal of the low resistance fling-cut switch, for identification fault point transition resistance with
And critical transition resistance, and the low resistance earthing electricity is controlled according to the fault point transition resistance and the critical transition resistance
The throwing of device R is hindered, cuts and controls arc suppression coil and compensate.
In an alternative embodiment, the grounding transformer 1 is the three-winding transformer of Y type wiring, wherein described
The neutral point of grounding transformer 1 is connect with the input terminal of the arc suppression coil device L.
In an alternative embodiment, the arc suppression coil parallel connection low-resistance grounding device further includes and the controller
First voltage mutual inductor (not identified in figure), the second voltage mutual inductor (not identified in figure) of 2 connections；The first voltage mutual inductance
Device is for accessing power grid bus, for measuring the phase voltage of singlephase earth fault phase；The second voltage mutual inductor connects described
Between the neutral point of grounding transformer 1 and the input terminal of the arc suppression coil device L, for detecting the grounding transformer 1
Voltage at neutral point.
In an alternative embodiment, the arc suppression coil parallel connection low-resistance grounding device further includes and the controller
The current transformer (not identifying in figure) of 2 connections, the current transformer are connected to the branch road of the arc suppression coil device L,
For detecting compensation electric current when arc suppression coil device L compensation.
Further, the arc suppression coil parallel connection low-resistance grounding device further includes the display connecting with the controller 2
Module (does not identify) in figure, for showing fault point transition resistance monitoring result.
The present apparatus, if failure is not eliminated after low resistance is put into for the first time, disappears after singlephase earth fault generation subsequent
In arc coil compensation process, device decides whether to put into low resistance again according to fault point transition resistance monitoring result, Jin Ershi
Existing failure Dynamic Recognition be isolated.The working principle of the arc suppression coil parallel connection low-resistance grounding device is as follows:
The arc suppression coil parallel connection low-resistance grounding device startup separator point transition resistance monitors identification function, if monitoring
Fault point transition resistance is less than or equal to critical transition resistance, then puts into low resistance earthing resistor R again to increase fault point
Earth current triggers protective relaying device movement, otherwise, continues to keep arc suppression coil compensation state；If failure vanishes exit
Arc suppression coil compensation state.
Compared with the existing technology, the beneficial effect of the embodiment of the present invention is:
The arc suppression coil parallel connection low-resistance grounding device, comprising: arc suppression coil device L, grounding transformer 1, low resistance
Grounding resistor R, low resistance fling-cut switch and controller 2；The three-phase input end of the grounding transformer 1 is for accessing electricity
Net, the of the input terminal of the output end of the grounding transformer 1 and the arc suppression coil device L, the low resistance fling-cut switch
One end connection；The second end of the low resistance fling-cut switch is connect with the first end of the low resistance earthing resistor R；It is described to disappear
The second end ground connection of the output end of camber line coil apparatus L, the low resistance earthing resistor R；The controller 2 and the low resistance
The control terminal of fling-cut switch connects, for identification fault point transition resistance and transition resistance control, and according to the fault point
Transition resistance and the critical transition resistance control the throwing of the low resistance earthing resistor R, cut；Controller 2 passes through acquisition
The phase voltage of the singlephase earth fault phase of the first voltage transformer measurement, the described of second voltage mutual inductor detection connect
Compensation electricity when the arc suppression coil device L compensation of voltage, current transformer detection at the neutral point of ground transformer 1
Stream, the fault point transition resistance and transition resistance identified, and when fault point transition resistance is less than or equal to critical transition electricity
When resistance, the low resistance earthing resistor R whether again switching is controlled, can be realized multiple switching low resistance function, is met real
The requirement of border fault condition.
Referring to Fig. 2, second embodiment of the invention provides a kind of control of arc suppression coil parallel connection low-resistance grounding device
Method, using the described in any item arc suppression coil parallel connection low-resistance grounding devices of such as first aspect, comprising the following steps:
S11: controller controls low resistance earthing resistor switching；
In embodiments of the present invention, the controller can for computer, mobile phone, tablet computer, laptop, industrial personal computer or
Person's server etc. calculates equipment, and the control method of the arc suppression coil parallel connection low-resistance grounding device can be used as one of function
Module is integrated on the controller, is executed by the controller.S12: after obtaining the low resistance earthing resistor investment
Voltage at the neutral point that phase voltage that first voltage mutual inductor detects, second voltage mutual inductor detect, arc suppression coil device
The direct-to-ground capacitance of the power grid outlet detected；
S13: it obtains the low resistance earthing resistor and exits the compensation electric current that rear current transformer detects；
S14: according to voltage, compensation electric current and direct-to-ground capacitance at the phase voltage, neutral point, fault point transition electricity is calculated
Resistance；
S15: according to voltage, compensation electric current and the electricity over the ground at preset route zero-sequenceprotection setting valve, neutral point
Hold, calculates critical transition resistance；
S16: according to the fault point transition resistance and the critical transition resistance, judge whether low described in switching again
Resistance eutral grounding resistor；
S17: when the transition resistance is not more than the critical transition resistance, the low resistance earthing resistor is controlled again
Secondary switching.
In inventive embodiments, by monitoring fault point transition after the low resistance earthing resistor puts into and exits
Resistance Rf, and work as fault point transition resistance Rf≤ critical transition resistance Rz, then device puts into low resistance earthing resistor again, with
Cut off faulty line；As fault point transition resistance RfThe critical transition resistance R of >z, then device does not put into low resistance earthing resistor,
It is maintained at arc suppression coil compensation state, can be avoided in compensation time range because failure point range expands or fault point was grounded
When crossing resistance reduces, traditional arc suppression coil parallel connection low-resistance grounding device can't put into the isolation of low resistance earthing resistor again
The problem of failure, can effectively cut off faulty line.
In an alternative embodiment, described according to voltage at the phase voltage, neutral point, compensation electric current and over the ground
Capacitor calculates fault point transition resistance, specifically includes:
According to voltage, compensation electric current at the neutral point, arc suppression coil inductance is calculated；
According to voltage, compensation electric current, direct-to-ground capacitance at the neutral point, the faulty line during arc suppression coil compensation is calculated
Zero-sequence current；
According to the phase voltage, arc suppression coil inductance, faulty line zero-sequence current, direct-to-ground capacitance, fault point transition is calculated
Resistance.
Before the resistance value to fault inspecting transition resistance, arc suppression coil parallel connection low resistance earthing as shown in connection with fig. 3
Singlephase earth fault equivalent circuit diagram after low resistance investment shown in singlephase earth fault schematic diagram, Fig. 4 occurs for route under device, right
The principle of low resistance investment isolated fault is illustrated:
In Fig. 3, U is three-phase system power supply, and ASCPLR is arc suppression coil parallel connection low-resistance grounding device, and C is all outlets
The direct-to-ground capacitance of route, RfFor the transition equivalent resistance of fault point；When arc suppression coil parallel connection low-resistance grounding device puts into low electricity
After hindering R, singlephase earth fault equivalent circuit after low resistance investment shown in Fig. 4, U in figure are obtainedxFor singlephase earth fault occurs
The phase voltage of phase；U0For the voltage at neutral point；UfFor fault ground point voltage.
The zero-sequence current I during low resistance is put on faulty line can be then calculated according to formula (I)fAre as follows:
Wherein, w=2 π f, generally 314rad/s.Assuming that route zero-sequenceprotection setting valve is Iz, then work as If< IzWhen, it is low
Resistance eutral grounding resistor can't isolated fault when putting into；It is possible thereby to know to so that low resistance earthing resistor investment after energy
Cut off faulty line, then the zero-sequence current I after putting into low resistance earthing resistor, on faulty linefIt should be greater than or be equal to route
Zero-sequenceprotection setting valve is Iz.It may thus be appreciated that the necessary condition of investment low resistance earthing resistor and isolated fault route is:
Wherein, RzFor corresponding line zero-sequenceprotection setting valve IzCritical transition resistance.Therefore, if putting into low electricity for the first time
Faulty line is not eliminated after resistance grounding resistor, then only needs device can be to earth fault transition resistance RfIt is monitored knowledge
Not, when monitoring Rf≤RzWhen, it can put into low resistance earthing resistor again, it is on the contrary then do not put into, continue to keep arc suppression coil
Compensating coefficient.
In an alternative embodiment, described according to voltage, benefit at preset route zero-sequenceprotection setting valve, neutral point
Electric current and the direct-to-ground capacitance are repaid, critical transition resistance is calculated, specifically includes:
According to formula (1), critical transition resistance is calculated；
Wherein, w=2 π f=314rad/s, L are arc suppression coil inductance, and C is the direct-to-ground capacitance, and R is that the low resistance connects
The resistance value of ground resistance device, IzFor preset route zero-sequenceprotection setting valve, UxFor the phase voltage.
In an alternative embodiment, described according to voltage, compensation electric current at the neutral point, calculate arc suppression coil electricity
Sense, specifically includes:
According to formula (2), arc suppression coil inductance is calculated；
Wherein, U0For voltage at neutral point, ILTo compensate electric current.
Referring to Fig. 5, it is that low resistance earthing resistor exits rear singlephase earth fault equivalent circuit diagram, it is described according to institute
Voltage at neutral point, compensation electric current, direct-to-ground capacitance are stated, calculates the faulty line zero-sequence current during arc suppression coil compensation, specifically
Include:
According to formula (3), the faulty line zero-sequence current during arc suppression coil compensation is calculated.
In an alternative embodiment, described according to the phase voltage, arc suppression coil inductance, faulty line zero sequence electricity
Stream, direct-to-ground capacitance calculate fault point transition resistance, specifically include:
According to formula (4), fault point transition resistance is calculated.
Compared with the existing technology, the beneficial effect of the embodiment of the present invention is:
By monitoring fault point transition resistance R after the low resistance earthing resistor puts into and exitsf, and work as failure
Point transition resistance Rf≤ critical transition resistance Rz, then device puts into low resistance earthing resistor again, to cut off faulty line；When
Fault point transition resistance RfThe critical transition resistance R of >z, then device does not put into low resistance earthing resistor, is maintained at arc suppression coil benefit
State is repaid, can be avoided when compensating reduces in time range because of the expansion of failure point range or fault point ground connection transition resistance, pass
The problem of system arc suppression coil parallel connection low-resistance grounding device can't put into low resistance earthing resistor isolated fault again, can have
Effectively excision faulty line.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of arc suppression coil parallel connection low-resistance grounding device characterized by comprising arc suppression coil device, grounding transformer,
Low resistance earthing resistor, low resistance fling-cut switch and controller；The three-phase input end of the grounding transformer is for accessing
Power grid, the of the input terminal of the output end of the grounding transformer and the arc suppression coil device, the low resistance fling-cut switch
One end connection；The second end of the low resistance fling-cut switch is connect with the first end of the low resistance earthing resistor；It is described to disappear
The second end ground connection of the output end of camber line coil apparatus, the low resistance earthing resistor；The controller and the low resistance are thrown
The control terminal connection closed is cut, for identification fault point transition resistance and critical transition resistance, and according to the fault point mistake
Resistance is crossed with the critical transition resistance to control the throwing of the low resistance earthing resistor, cut and control arc suppression coil and mended
It repays.
2. arc suppression coil parallel connection low-resistance grounding device as described in claim 1, which is characterized in that the grounding transformer is
The three-winding transformer of Y type wiring, wherein the input terminal of the neutral point of the grounding transformer and the arc suppression coil device connects
It connects.
3. arc suppression coil parallel connection low-resistance grounding device as claimed in claim 2, which is characterized in that the arc suppression coil is in parallel
Low-resistance grounding device further includes the first voltage mutual inductor connecting with the controller, second voltage mutual inductor；Described first
Voltage transformer is for accessing power grid bus, for measuring the phase voltage of singlephase earth fault phase；The second voltage mutual inductor
It connects between the neutral point of the grounding transformer and the input terminal of the arc suppression coil device, for detecting the ground connection transformation
Voltage at the neutral point of device.
4. arc suppression coil parallel connection low-resistance grounding device as claimed in claim 3, which is characterized in that the arc suppression coil is in parallel
Low-resistance grounding device further includes the current transformer connecting with the controller, and the current transformer is connected to the extinguishing arc
The branch road of coil device, for detecting compensation electric current when arc suppression coil device compensation.
5. a kind of control method of arc suppression coil parallel connection low-resistance grounding device, which is characterized in that using as claimed in claim 4
Arc suppression coil parallel connection low-resistance grounding device, comprising the following steps:
Controller controls low resistance earthing resistor switching；
Obtain the phase voltage that first voltage mutual inductor detects after the low resistance earthing resistor is put into, second voltage mutual inductor
Voltage at the neutral point detected, the direct-to-ground capacitance for the power grid outlet that arc suppression coil device detects；
It obtains the low resistance earthing resistor and exits the compensation electric current that rear current transformer detects；
According to voltage, compensation electric current and direct-to-ground capacitance at the phase voltage, neutral point, fault point transition resistance is calculated；
Faced according to voltage, compensation electric current and the direct-to-ground capacitance, calculating at preset route zero-sequenceprotection setting valve, neutral point
Boundary's transition resistance；
According to the fault point transition resistance and the critical transition resistance, judge whether low resistance earthing described in switching again
Resistor；
When the transition resistance is not more than the critical transition resistance, low resistance earthing resistor switching again is controlled.
6. the control method of arc suppression coil parallel connection low-resistance grounding device as claimed in claim 5, which is characterized in that described
According to voltage, compensation electric current and direct-to-ground capacitance at the phase voltage, neutral point, fault point transition resistance is calculated, is specifically included:
According to voltage, compensation electric current at the neutral point, arc suppression coil inductance is calculated；
According to voltage, compensation electric current, direct-to-ground capacitance at the neutral point, the faulty line zero sequence during arc suppression coil compensation is calculated
Electric current；
According to the phase voltage, arc suppression coil inductance, faulty line zero-sequence current, direct-to-ground capacitance, fault point transition resistance is calculated.
7. the control method of arc suppression coil parallel connection low-resistance grounding device as claimed in claim 6, which is characterized in that described
According to voltage, compensation electric current and the direct-to-ground capacitance at preset route zero-sequenceprotection setting valve, neutral point, critical transition is calculated
Resistance specifically includes:
According to formula (1), critical transition resistance is calculated；
Wherein, w=2 π f=314rad/s, L are arc suppression coil inductance, and C is the direct-to-ground capacitance, and R is the low resistance earthing electricity
Hinder the resistance value of device, IzFor preset route zero-sequenceprotection setting valve, UxFor the phase voltage.
8. the control method of arc suppression coil parallel connection low-resistance grounding device as claimed in claim 7, which is characterized in that described
According to voltage, compensation electric current at the neutral point, arc suppression coil inductance is calculated, is specifically included:
According to formula (2), arc suppression coil inductance is calculated；
Wherein, U0For voltage at neutral point, ILTo compensate electric current.
9. the control method of arc suppression coil parallel connection low-resistance grounding device as claimed in claim 8, which is characterized in that described
According to voltage, compensation electric current, direct-to-ground capacitance at the neutral point, the faulty line zero-sequence current during arc suppression coil compensation is calculated,
It specifically includes:
According to formula (3), the faulty line zero-sequence current during arc suppression coil compensation is calculated.
10. the control method of arc suppression coil parallel connection low-resistance grounding device as claimed in claim 9, which is characterized in that described
According to the phase voltage, arc suppression coil inductance, faulty line zero-sequence current, direct-to-ground capacitance, fault point transition resistance is calculated, specifically
Include:
According to formula (4), fault point transition resistance is calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910486431.6A CN110148931B (en) | 2019-06-05 | 2019-06-05 | Arc suppression coil parallel low-resistance grounding device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910486431.6A CN110148931B (en) | 2019-06-05 | 2019-06-05 | Arc suppression coil parallel low-resistance grounding device and control method |
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| CN112165077A (en) * | 2020-10-29 | 2021-01-01 | 国网北京市电力公司 | Grounding device of microgrid, control method thereof, control device and grounding system |
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