CN2263411Y

CN2263411Y - Magnetic valve type controlled reactor

Info

Publication number: CN2263411Y
Application number: CN 95223137
Authority: CN
Inventors: 陈维贤; 陈柏超; 尹忠东; 刘虹; 鲁铁成
Original assignee: Wuhan Irrigation & Electric-Power Univ
Current assignee: Wuhan Irrigation & Electric-Power Univ
Priority date: 1995-09-19
Filing date: 1995-09-19
Publication date: 1997-09-24
Anticipated expiration: 2005-09-19

Abstract

The utility model discloses a controlled reactor in a magnetic valve type. At present, no special shunt reactor exists in a high voltage electric network; a static compensating device is very expensive and is only adopted in some pivot substations, and the volume of the shunt reactor in the super-high voltage electric network is not adjustable. The utility model is a novel controlled reactor in a magnetic valve type. Each phase has four windings which are sheathed on a double-iron-core column; each iron core is provided with a small section which plays a role of a magnetic valve; an internal power supply is provided by an auto-tap connecting wire; direct current magnetic flux is generated in the double-iron-core column by two pieces of controllable silicon which are reversely connected; the magnetic saturation of the iron core can be changed by controlling the trigger angle of the controllable silicon; thus, the utility model can smoothly adjust the capacity of a reactor and can be adopted by electric networks in all levels of voltage.

Description

Magnetic valve type controllable reactor

The utility model is a kind of novel electric equipment of compensated line capacitive reactive power in high pressure and the supergrid.

When transmitting underload in the transmission line, will remain a large amount of capacitive reactive powers in the system, capacity effect makes line end voltage significantly raise, and influences the normal operation of user's electric equipment and reduces overall power transmission efficiency.But lack special-purpose perceptual compensation arrangement in the high-voltage fence at present, only in individual other 10kV electric substation, adopted air-core reactor, and in individual other hinge electric substation, be provided with quiet benefit device, and the latter is taken up an area of many, and control is complicated and price is high and can not extensively adopt.In the supertension line of China 330～500kV, then generally be provided with conventional superhigh pressure reactance device, or install the compensation reactor of 35kV level in the tertiary winding side of main transformer additional.

Except that quiet benefit, the capacity of above-mentioned reactor all is nonadjustable.The water power proportion of a lot of electrical networks of China is very big, trend change between the diel is fierce, these reactors are had to drop into when circuit transmission small-power and are transmitted when high-power in addition partly or entirely excision, thereby many reactors and special switchgear need be set and carry out frequent division operation.In order to suppress the needs of switching overvoltage, the superhigh pressure reactance device of China even drop into for a long time and will not excise.The running quality that all these will significantly increase equipment investment or reduce electrical network.

The utility model is exactly at above-mentioned situation, adjustable with capacity, reduce cost, applicability is target by force, being complementary with split core post and winding connection thereof and relative trigger control circuit is a kind of magnetic valve type controllable reactor that means are developed.

The utility model is made up of outer core post, split core post, winding, diode, controllable silicon and trigger control circuit thereof.The split core post is two iron core column arranged side by side, every post mid portion has a magnet valve core packet that it is divided into, following two sections, be with a winding on every section, two winding terminals in bottom of two winding terminals in the top of epimere and hypomere connect together respectively, two winding terminals in top of two winding terminals in the bottom of epimere and hypomere then intersect and are connected in series, the top of the bottom of winding and following winding is equipped with tap on every post, on every post, be connected to controllable silicon between following two taps, and the silicon controlled polarity on two posts is opposite, be connected on two silicon controlled gate poles for its adjustable trigger impulse control circuit of trigger angle that takes turns conducting, be connected to a diode between the two ends of intermediate interdigitated tie point.

Below in conjunction with accompanying drawing the utility model is further described.

Accompanying drawing 1 and accompanying drawing 2 be respectively one mutually the magnetic valve type reactor structural representation and simplify winding diagram.One heel post of main iron core is divided into two, the core packet that a small bore (be about main cross section 1/3rd) is arranged in the middle of the every post, when the magnetic flux of crossing when chain is little, small bore is unsaturated, and magnetic flux is smoothly by whole iron core, after magnetic flux increases to a certain numerical value, the small bore section is saturated, magnetic resistance increases, and stop magnetic flux to continue to increase, thereby the small bore section has played the magnet valve effect.In double core leg, put four windings, and intersect in the centre and to be connected in series, draw four taps, turn ratio simultaneously at the middle part Be about 5%; Insert the controllable silicon KP that oppositely connects between the tap of every post both sides ₁And KP ₂, diode D is across intersecting end points, and m, n are two terminals of reactor.

When applied voltage e (t) is positive polarity, as Fig. 3, four tap voltages

Be positive polarity also, the present makes KP ₁Trigger action produces direct current i respectively in the upper and lower winding ₁And i ₂, they increase magnetic to right iron core rod's degaussing and left iron core post, make the latter take place saturated and reduce total inductance value (increase capacity).As e (t) and corresponding

During for negative polarity, trigger KP ₂Make it conducting, current circuit as shown in Figure 4, its direction and i ₁And i ₂Identical, this makes right iron core rod increase magnetic and the degaussing of left iron core post, and corresponding inductance reduces equally.Like this, KP ₁And KP ₂In turn conducting played the full-wave rectification effect, the triggering and conducting angle that changes them is to change i ₁～i ₄Size, can change the magnetic saturation of iron core, thereby regulate the capacity of reactor smoothly.The function of diode D provides the afterflow passage, helps KP ₁And KP ₂Turn-off and the raising rectification efficiency.

As can be seen, in all cases, the DC control magnetic flux that is produced oneself group in two and half iron core column closes, and does not outwards flow out; In addition, the control winding of reactor unites two into one with the work winding, is the self coupling form, makes general structure greatly simplify and helps reducing electric energy loss.

As the examples of implementation that an automatic Regulation is used, listed the theory diagram of control device among Fig. 5, detailed process is: through voltage transformer T _uU obtains signal by line voltage, through rectification and reference voltage U _rObtain DC deviation voltage Δ u relatively, again through active power filtering filtering high frequency composition, handle by pid correction circuit (cascade compensation) and to deliver to that amplifying circuit amplifies and amplitude limit (it is out of control that the purpose of amplitude limit is to avoid pulse-losing to cause), the DC deviation signal that amplifies is modulated with the AC synchronous signal of taking from electrical network, drives trigger impulse so that produce.

The total figure of the principle wiring of Automatic Regulation Control device as shown in Figure 6, wherein I relatively reaches active power filtering for measuring, II is the pid correction circuit, III is for amplifying amplitude limiter circuit, IV be synchronous, phase shift and pulse shaping circuit.Fig. 7 is for driving circuits for triggering, and signal adds on two silicon controlled gate poles by pulse transformer MB after amplifying here; Because controllable silicon is in high potential, and control circuit is in electronegative potential, so need to adopt pulse transformer to finish Quarantine Tasks.

The magnetic valve type controllable reactor of making according to the utility model can be regulated self capacity according to the big or small automatic smoothing ground of the variation of line voltage or through-put power, so that electrical network reaches best perception compensation, and can common employing in the electrical network of each step voltage.As in for the extremely wide 0.4～10kV electrical networks of number with the cosine capacitor operation that is in parallel, the capacity of then regulating reactor smoothly also just equals to suit smoothly capacitor, when overcompensation, then be equivalent to excise capacitor and perceptual power is provided, not only substitute original each of dividing into groups to suit switch fully, and reached the purpose of the step-less adjustment from the capacitive to the perception.

The distinguishing feature such as that this reactor has is simple in structure, occupation of land is little, cost is low, applicability is strong.

Accompanying drawing 1 is the structural representation of a phase magnetic valve type controllable reactor.Accompanying drawing 2 is the simplification winding diagram of a phase magnetic valve type controllable reactor.Working state schematic representation when accompanying drawing 3 is applied voltage e (t) for positive polarity.Working state schematic representation when accompanying drawing 4 is applied voltage e (t) for negative polarity.Accompanying drawing 5 is the theory diagram of magnetic valve type controllable reactor.Accompanying drawing 6 is always schemed for the principle wiring of magnetic valve type controllable reactor.

Claims

1. one kind is used for the magnetic valve type controllable reactor that high-voltage fence compensates capacitive reactive power, by the outer core post, the split core post, winding, diode, controllable silicon and trigger control circuit thereof are formed, it is characterized in that: described split core post is two iron core column arranged side by side, every post mid portion has a magnet valve core packet that it is divided into, following two sections, the outside is with four windings, two winding terminals in bottom of two winding terminals in the top of epimere and hypomere connect together respectively, and two winding terminals in top of two winding terminals in the bottom of epimere and hypomere then intersect and are connected in series; The top of the bottom of winding and following winding is equipped with tap on every post, be connected to controllable silicon between upper and lower two taps of every post, and the silicon controlled polarity on two posts is opposite, is connected on two silicon controlled gate poles for its adjustable trigger impulse control circuit of trigger angle that takes turns conducting; Be connected to a diode between the two ends of intermediate interdigitated tie point.

2, magnetic valve type controllable reactor according to claim 1 is characterized in that: the sectional area of described magnet valve core packet be equivalent to core section long-pending 1/3rd.

3, according to claim 1,2 described magnetic valve type controllable reactors, it is characterized in that: the number of turn of described winding middle part tap is 5% of a total number of turns.