CN1633001A - Non-harmonic phase-controlled rapid arc extinction and line selection apparatus - Google Patents

Abstract

This invention relates to a non-harmonic mutual-control quick arcing and wire-selecting device. A Z-type earth transformer is connected to the bus bar, its neutral point is connected to one end of an arcing coil via a single phase isolating switch, the other end is linked to the ground by a current mutual inductor, the neutral point is connected with lighting arrestor and a single phase voltage mutual inductor, both ends of multiple secondary short circuit windings of the oil are parallel to thyristors, the zero-order current mutual inductors pass through the center to connect to the tail wires, outputs of the zero-order current and single-phase voltage mutual inductors are connected to a controller.

Description

Non-harmonic phase-controlled rapid arc extinction and line selection apparatus

Technical field

The present invention relates to a kind ofly from motion tracking arc extinction compensation and line selection apparatus, specifically is a kind of non-harmonic phase-controlled rapid arc extinction and line selection apparatus that does not need additional filter.Be used for technical field of electricity.

Background technology

In the arc suppression coil of at present domestic and international various types, the arc suppression coil of high short-circuit impedance formula is big and can reach the purpose of continuous adjusting offset current by continuously changing thyristor operating angle with its adjustable range, but this mode can produce a large amount of harmonic waves when regulating, therefore must increase filter, and the filter complex structure, form by several jumbo reactors and capacitor, not only cost is higher, and because capacitor is difficult to maintenance, device reliability is low, in running, along with the ageing parameter skew of filter, the arc suppression coil performance is deterioration, and filter overcurrent occurs and burns when serious.

Find through literature search prior art, publication is at " electric power network technique " (Power SystemTechnology) " the automatic rapid arc extinction of high short-circuit impedance transformer type system---the realization of the novel grounded mode of power network neutral point " literary composition on 2000 7 (the 24th the 7th phase of volume), point out in this article " this arc suppression coil is a kind of novel transformer type controlled reactor; the short circuit leakage reactance between one, secondary winding very big (reach 100%; or bigger), secondary winding thyristor short circuit.Regulate the short circuit current of secondary winding by the angle of flow of regulating thyristor, thereby realize the controllable adjustment of reactance value "; and " special filter circuit is set in the package unit, and the harmonic wave that produces during in order to absorption thyristor break-make makes reactor produce power current."; these system's characteristics are as follows: the arc suppression coil short-circuited winding has one; all offset currents rely on the controllable silicon that is connected on this winding to regulate; this controllable silicon is by changing angle of flow control total current; because the silicon controlled effect will produce a large amount of harmonic wave (maximum reach rated current 14%), therefore added another one Filter Winding and filter in the device, installed complex and expensive; and test and show that filtered harmonic wave generally also has about 3%, reliability is not high.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, a kind of non-harmonic phase-controlled rapid arc extinction and line selection apparatus are provided, its arc suppression coil compensation electric current can be regulated and continuously without any need for filter, make its phase control type arc suppression coil that has overcome traditional high short-circuit impedance in adjustment process, can produce the defective of a large amount of harmonic currents, do not need additional Filter Winding and filter, stable and reliable for performance.

The present invention is achieved by the following technical solutions, the present invention includes: Z type grounding transformer B, with the zero sequence current mutual inductor Line1-Line48 and the controller XHK of a plurality of second short circuit winding arc suppression coil L, controllable silicon Ko～Kn, current transformer CT, single-phase potential transformer PT, lightning arrester MOA, single-phase isolating switch G, each outlet.Its annexation is: Z type grounding transformer B is connected to bus, its neutral point is through single-phase isolating switch G, be connected to arc suppression coil L one end of band secondary winding, the arc suppression coil L other end is connected to ground by current transformer CT, neutral point is connected to lightning arrester MOA and single-phase potential transformer PT simultaneously, each short-circuited winding two ends of arc suppression coil L secondary are in parallel respectively one group of controllable silicon Ko～Kn, the zero sequence current mutual inductor Line1-Line48 that each bar outlet installing punching of system connects.Sampled signal and control signal enter controller XHK in the system, and controller XHK is to be the microcomputer control device of kernel by the PC104 industrial computer, and XHK is the code name of new arc suppression coil control system.

Grounding transformer B is used for producing neutral point (can not wanting grounding transformer B for the electrical network that neutral point is arranged), controllable silicon K among the present invention _o～Kn controls each short-circuited winding, the switching of single-phase isolating switch G control arc suppression coil L, lightning arrester MOA is used for limiting neutral point overvoltage, single-phase potential transformer PT sends the neutral point voltage signal into controller XHK, zero sequence current mutual inductor CT1～CT48 finishes the sampling of 1～48 route road zero-sequence current, and this signal is sent into controller XHK and carried out earthing wire-selecting.

The present invention has overcome the shortcoming of the inductive current classification adjustment of traditional turn-adjusting arc suppression coil compensation, be different from the high short-circuit impedance formula of SCR control arc suppression coil device again, the arc suppression coil harmonic current of the thyristor controlled high short-circuit impedance of tradition is bigger, need filter, the complex structure reliability is low, and actual harmonic current is still bigger.Arc suppression coil compensation electric current of the present invention is provided by the SCR control that is connected arc suppression coil secondary circuit short-circuit winding, most of offset current is provided by full conducting of controllable silicon and the disconnected combination of complete shut-down, therefore offset current does not have harmonic components, remaining part electric current is to be realized regulating continuously by changing the angle of flow by the controllable silicon of one of them minimum short circuit current winding parallel connection, therefore harmonic wave can be ignored, do not need Filter Winding and filter, have high using value.

Description of drawings

Fig. 1 is a structural representation of the present invention

Fig. 2 is an arc suppression coil schematic diagram of the present invention

Embodiment

As shown in Figure 1 and Figure 2, the present invention includes: Z type grounding transformer B, have (n+1) individual (as three or four) second short circuit winding arc suppression coil L, control the controllable silicon K of each short-circuited winding _o～Kn, current transformer CT, single-phase potential transformer PT, lightning arrester MOA, single-phase isolating switch G, each outlet zero sequence current mutual inductor Line1-Line48 and controller XHK.Its annexation is: Z type grounding transformer B is connected to bus, its neutral point is connected to arc suppression coil L one end through single-phase isolating switch G, the arc suppression coil L other end is connected to ground by current transformer CT, neutral point is connected to lightning arrester MOA and single-phase potential transformer PT simultaneously, each one group of controllable silicon K respectively in parallel of arc suppression coil L secondary winding two ends _o～Kn, each controllable silicon is controlled by controller XHK, the zero sequence current mutual inductor Line1-Line48 that each bar outlet installing punching of system connects, single-phase potential transformer PT summation current transformer CT output signal enters controller XHK and amplifies and AD conversion in the system, and controller XHK is according to result of calculation output SCR control signal.

The offset current of apparatus of the present invention is made up of the offset current summation that each short-circuited winding of arc suppression coil provides, wherein the short circuit current of each short-circuited winding (equivalence is to primary side) sum is rated current I, and the offset current that provides during except controllable silicon K1 and the full conducting of controllable silicon K2 equates to be I ₀Outside, the offset current that provides during the full conducting of the controllable silicon of other short-circuited windings is I ₀2 multiples increase progressively.

$I=I_0(1+\underset{k=0}{\overset{n}{\mathrm{\Σ}}}{2}^k)$

If offset current between 0～Io the time, changes the angle of flow by controllable silicon Ko and realizes; When offset current was between Io～2Io, the full conducting of controllable silicon K1 still changed the angle of flow by controllable silicon Ko and realizes; If offset current is between 2Io～3Io the time, the full conducting of controllable silicon K2, the K1 complete shut-down is disconnected, changes the angle of flow by controllable silicon Ko and realizes; Or the like, in the rated current scope, always can be implemented in adjusting continuously in the full offset current scope by the break-make combination of K1-Kn and the continuous adjusting angle of flow of Ko, because the complete conducting of controllable silicon or turn-off fully and can not produce harmonic wave, and the electric current that the controllable silicon Ko that changes the angle of flow controls is very little, the harmonic wave that produces can be ignored, so the present invention do not need Filter Winding and filter, has very big competitive advantage.

Claims (3)

1, a kind of non-harmonic phase-controlled formula is from motion tracking arc extinction compensation and line selection apparatus, comprise: Z type grounding transformer B, be with a plurality of second short circuit winding arc suppression coil L, current transformer CT, single-phase potential transformer PT, lightning arrester MOA, single-phase isolating switch G, each outlet zero sequence current mutual inductor Line1-Line48, it is characterized in that, also comprise: the controllable silicon Ko～Kn and the controller XHK that control each short-circuited winding, Z type grounding transformer B is connected to bus, its neutral point is connected to arc suppression coil L one end through single-phase isolating switch G, the arc suppression coil L other end is connected to ground by current transformer CT, neutral point is connected to lightning arrester MOA and single-phase potential transformer PT simultaneously, arc suppression coil L second short circuit winding two ends are controllable silicon Ko～Kn in parallel respectively, zero sequence current mutual inductor Line1-Line48 punching is connected each bar outlet of system, each zero sequence current mutual inductor and single-phase potential transformer PT output are connected to amplifier and the A/D convertor circuit of controller XHK, the triggering state of controller XHK output silicon controlled trigger signal control controllable silicon Ko～Kn.

2, non-harmonic phase-controlled formula according to claim 1 is from motion tracking arc extinction compensation and line selection apparatus, it is characterized in that, its offset current is made up of the offset current summation that each short-circuited winding of arc suppression coil provides, wherein the short circuit current sum of each short-circuited winding is rated current I, and the offset current that provides during except controllable silicon K1 and the full conducting of controllable silicon K2 equates to be I ₀Outside, the offset current that provides during the full conducting of the controllable silicon of other short-circuited windings is I ₀2 multiples increase progressively.

3, non-harmonic phase-controlled formula according to claim 1 is characterized in that from motion tracking arc extinction compensation and line selection apparatus, and controller XHK is to be the microcomputer control device of kernel by the PC104 industrial computer.

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