CN203398782U - Phase control type arc suppression coil - Google Patents
Phase control type arc suppression coil Download PDFInfo
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- CN203398782U CN203398782U CN201320460593.0U CN201320460593U CN203398782U CN 203398782 U CN203398782 U CN 203398782U CN 201320460593 U CN201320460593 U CN 201320460593U CN 203398782 U CN203398782 U CN 203398782U
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- arc suppression
- suppression coil
- secondary winding
- phase
- loop
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Abstract
The utility model relates to a phase control type arc suppression coil, which comprises an arc suppression coil body, a thyristor control loop and a filter loop. The arc suppression coil body is composed of a primary winding and two secondary windings. The primary winding is connected with the main loop of a power grid. The first secondary winding is connected with the thyristor control loop and a second secondary winding is connected with the filter loop. The filter loop is composed of a triple-harmonic filter branch and a quintuple-harmonic filter branch, wherein the triple-harmonic filter branch and the quintuple-harmonic filter branch are respectively connected in parallel at the two ends of the second secondary winding. A hurl-slices switch K is connected in series between the filter branches and the second secondary winding. According to the technical scheme of the utility model, when the phase control type arc suppression coil comprising the filter loop is in use, the three-phase ground capacitances of the power grid and the capacitance current of the power grid during the single phase grounding process can be precisely calculated. Therefore, a proper amount of compensation current is reliably ensured to be supplied by the arc suppression coil.
Description
Technical field
The utility model relates to power distribution network grounding technology field, particularly a kind of phase-control type arc suppression coil.
Background technology
Along with the capacity of electrical network increases, distance extends, electric pressure raises gradually, the electric arc that while there is single phase ground fault in the case, earthing capacitance current forms in fault point can not be from horizontal blanking, the overvoltage that indirect arc produces tends to make fault spread, significantly reduces the reliability of power system operation.China often adopts the mode of neutral by arc extinction coil grounding to carry out arc extinguishing in low and medium voltage distribution network system at present, can automatically eliminate moment property earth fault, guarantees the normal operation of electric power system.
Phase-control type arc suppression coil is called again high short-circuit impedance transformer type arc suppression coil, a kind of by thyristor controlled arc suppression coil, having that electric current adjustable range is large, voltage-current characteristic good, can realize the advantages such as stepless continuous is adjustable, is at present most widely used with mode arc coil.Phased arc suppression coil is a kind of novel controlled reactor, its schematic diagram as shown in Figure 1, short-circuit impedance between winding and secondary winding is very large, can reach 100%, secondary winding output connects a pair of antiparallel controllable silicon, by changing the silicon controlled angle of flow, realize regulating continuously fast of inductance value, to drop into applicable inductance value, the capacitance current producing in bucking-out system in system.The measurement of the calculating of the phase-control type arc suppression coil angle of flow based on system capacitive current, therefore no matter adopt the automatic blowout coil device of which kind of regulative mode, all must be able to realize the online detection of capacitance current, and can guarantee the precision of detection, can calculate the most suitable angle of flow.
In arc suppression coil device, the most general capacitance current detection method of application is Displacement Voltage Method at present.Displacement voltage ratio juris is after arc suppression coil puts into operation, and compensation network, under normal running (operation) conditions, drops into the different induction reactance X of electrical network according to arc suppression coil corresponding under the different angles of flow
land the corresponding inductive current I recording
0, calculate electrical network three-phase capacitance to earth X
c; And then the unbalance voltage U during according to ground connection
0calculate the capacitance current I of system when there is earth fault
c.
Yet because system is when normally moving, the degree of asymmetry of system is generally 0.5%～1.5%, the corresponding higher value of overhead transmission line, cable mixing electrical network in the majority is got compared with fractional value, and during pure cable system, degree of asymmetry is just often less than 0.5%; And the reliably conducting when being greater than 5V of the controllable silicon trigger voltage of phase-control type arc suppression coil can realize reluctantly the adjusting of Trigger Angle when being greater than 10V.While therefore adopting Displacement Voltage Method to carry out the calculating of capacitance current in the situation that electrical network degree of asymmetry is less, owing to cannot realizing the triggering of thyristor operating angle, thereby cause the three-phase capacitance to earth cannot accurate Calculation, finally have a strong impact on the calculating of the capacitance current value of system when there is earth fault.
In addition, because the inductance value adjustment of phase-control type arc suppression coil is that the silicon controlled angle of flow by regulating secondary winding to connect is realized, be equivalent to TCR branch road, the electric current that therefore flows through secondary winding that is to say and flows through silicon controlled electric current,, there is harmonic component in the electric current for intermittent conduction; In order to guarantee the external output current aberration rate of winding, in allowed band, must carry out filtering processing.Chinese patent 200920314624.5 discloses a kind of phase-control type arc suppression coil with filter circuit, comprise arc suppression coil body, controllable silicon loop and filter circuit, arc suppression coil body comprises a winding and two secondary winding, one time winding is serially connected in electrical network major loop, first secondary winding connects controllable silicon loop, second secondary winding connects filter circuit, and what filter circuit adopted is single-phase converter.Although adopt this technology harmonic carcellation preferably, its filter circuit is comparatively complicated, is relatively difficult to realize in actual applications; And this phase-control type arc suppression coil still adopts Displacement Voltage Method to carry out the calculating of capacitance current, cannot eliminate existing defect when three-phase capacitance to earth calculates while normally moving that adopts this kind of method to carry out electrical network.
Utility model content
The utility model technical issues that need to address are to provide a kind of phase-control type arc suppression coil, can be in the situation that not affected by electrical network degree of asymmetry, and three-phase capacitance to earth when electrical network is normally moved is accurately measured.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is as follows:
A kind of phase-control type arc suppression coil, comprise arc suppression coil body, SCR control loop and filter circuit, described arc suppression coil body comprises a winding and two secondary winding, one time winding is connected in electrical network major loop, first secondary winding connects SCR control loop, and second secondary winding connects filter circuit; Described filter circuit comprises 3 subharmonic filter branch and the 5 subharmonic filter branch that are connected in respectively second secondary winding two ends in parallel, and 3 subharmonic filter branch and 5 subharmonic filter branch are respectively electric capacity and the inductive branch being connected in series; Between described filter circuit and second secondary winding, be connected in series and be useful on the fling-cut switch K that controls filter circuit switching.
Fling-cut switch K described in the utility model is preferably vacuum contactor or vacuum circuit-breaker.
Owing to having adopted technique scheme, the technological progress that the utility model is obtained is:
The phase-control type arc suppression coil of the utility model based on filter circuit, by switching the running status of fling-cut switch, change filter circuit running status in electrical network, then utilize filtering capacitor to realize the dividing potential drop of capacitor, in the time of can realizing electrical network three-phase ground capacitance value and electrical network generation single-phase earthing, the accurate Calculation of capacitance current, provides reliable guarantee for arc suppression coil can provide appropriate offset current.Phase-control type arc suppression coil hardware configuration of the present utility model is simple and reliable, with low cost, and capacitance current measurement computational methods complexity is low, precision is higher, applicable to any electrical network, is not subject to the impact of electrical network degree of asymmetry.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of phase-control type arc suppression coil described in the utility model.
Fig. 2 is the equivalence conversion schematic diagram of electrical network phase-control type arc suppression coil while normally moving.
Fig. 3 is the isoboles of electrical network major loop while normally moving.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
, its schematic diagram, as shown in 1, comprises arc suppression coil body, SCR control loop and filter circuit, and arc suppression coil body comprises a winding and two secondary winding, and one time winding is connected in electrical network major loop; First secondary winding, for controlling winding, connects SCR control loop, and SCR control loop mainly comprises a pair of antiparallel controllable silicon SCR, by regulating silicon controlled trigger angle to regulate the inductance value of first secondary winding.
Second secondary winding connects filter circuit, filter circuit comprises 3 subharmonic filter branch and the 5 subharmonic filter branch that are connected in respectively second secondary winding two ends in parallel, 3 subharmonic filter branch are capacitor C 3 and inductance L 3 branch roads that are connected in series, for filtering 3 subharmonic; 5 subharmonic filter branch are capacitor C 5 and inductance L 5 branch roads that are connected in series, for filtering 5 subharmonic.Between filter circuit and second secondary winding, be connected in series with fling-cut switch K, for controlling the switching of filter circuit.
A capacitance current measurement method for above-mentioned phase-control type arc suppression coil, the method adopts dividing potential drop mensuration, specifically comprises the following steps:
When A. phase-control type arc suppression coil normally moves, does not trigger in SCR control loop, and first secondary winding is open-circuit condition; And now 3 subharmonic filter branch and 5 subharmonic filter branch, with respect to power frequency, can be equivalent to second capacitor that capacity is known, the capacitance of second capacitor is C
xh2.Because the excitation impedance of phase-control type arc suppression coil is greater than 10k Ω, and now neutral point displacement voltage is less, therefore can ignore the inductive current that flows through phase-control type arc suppression coil; The once part of phase-control type arc suppression coil is equivalent to the capacitor being connected in electrical network major loop, as shown in Figure 2.The capacitance of setting a capacitor is C
xh, C
xhpass through C
xh2calculate.
No. one time capacitor capacitance is calculated according to following formula:
C
xh=C
xh2*n
2
Wherein: the winding that n is phase-control type arc suppression coil and the no-load voltage ratio value between second secondary winding.
B. electrical network major loop is equivalent to the measurement branch road being connected in series between neutral point and ground, measures branch road and be the fling-cut switch K that is connected in series, capacitor and electrical network three-phase ground capacitance; The capacitance of setting electrical network three-phase ground capacitance is C
0, the voltage of neutral point of electric network is E
0, the voltage of electrical network three-phase ground capacitance is U
0, as shown in Figure 3.
C. carry out dividing potential drop measurement and calculate electrical network three-phase ground capacitance value:
First disconnect fling-cut switch, measure the voltage of electrical network three-phase ground capacitance, now the voltage of electrical network three-phase ground capacitance and the voltage of neutral point of electric network equate E
0,
Closed fling-cut switch, the voltage U of measurement electrical network three-phase ground capacitance
0, the dividing potential drop of the voltage that now voltage of electrical network three-phase ground capacitance is neutral point of electric network on capacitor and electrical network three-phase ground capacitance, that is:
U
0=C
0*E
0/(C
0+C
xh)
To electrical network three-phase ground capacitance value, be can be obtained fom the above equation:
C
0=U
0*C
xh/(E
0-U
0)
D. the electrical network three-phase ground capacitance value calculating according to step C, and neutral point voltage to earth value during coupling system generation single-phase earthing, the capacitance current value of system in the time of can calculating system single-phase earthing.
In the utility model, fling-cut switch is vacuum contactor or vacuum circuit-breaker, and the rated voltage of filter branch is generally and exchanges 500V, so the fling-cut switch in the present embodiment can be selected the vacuum contactor that exchanges 1140V.
Claims (2)
1. a phase-control type arc suppression coil, comprise arc suppression coil body, SCR control loop and filter circuit, described arc suppression coil body comprises a winding and two secondary winding, one time winding is connected in electrical network major loop, first secondary winding connects SCR control loop, and second secondary winding connects filter circuit; It is characterized in that: described filter circuit comprises 3 subharmonic filter branch and the 5 subharmonic filter branch that are connected in respectively second secondary winding two ends in parallel, and 3 subharmonic filter branch and 5 subharmonic filter branch are respectively electric capacity and the inductive branch being connected in series; Between described filter circuit and second secondary winding, be connected in series and be useful on the fling-cut switch K that controls filter circuit switching.
2. phase-control type arc suppression coil according to claim 1, is characterized in that: described fling-cut switch K is vacuum contactor or vacuum circuit-breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320460593.0U CN203398782U (en) | 2013-07-30 | 2013-07-30 | Phase control type arc suppression coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320460593.0U CN203398782U (en) | 2013-07-30 | 2013-07-30 | Phase control type arc suppression coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203398782U true CN203398782U (en) | 2014-01-15 |
Family
ID=49910282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320460593.0U Expired - Lifetime CN203398782U (en) | 2013-07-30 | 2013-07-30 | Phase control type arc suppression coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203398782U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552875A (en) * | 2016-02-29 | 2016-05-04 | 国家电网公司 | Arc suppression coil device and impulse current suppression method thereof |
| CN105676071A (en) * | 2016-02-29 | 2016-06-15 | 国家电网公司 | High-resistance control method for fault line selection |
-
2013
- 2013-07-30 CN CN201320460593.0U patent/CN203398782U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552875A (en) * | 2016-02-29 | 2016-05-04 | 国家电网公司 | Arc suppression coil device and impulse current suppression method thereof |
| CN105676071A (en) * | 2016-02-29 | 2016-06-15 | 国家电网公司 | High-resistance control method for fault line selection |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |
|
| CX01 | Expiry of patent term |