CN205283107U - Lossless degree of depth current limiting device of discrete - Google Patents

Abstract

The utility model provides a lossless degree of depth current limiting device of discrete, includes degree of depth current limiting reactor and change of current switching control integrated device, degree of depth current limiting reactor install and pass through parallel in change of current switching control integrated device's side and connect, independently install degree of depth current limiting reactor to be connected with change of current switching control integrated device, so that that the high -intensity magnetic field that produces at the reactor of change of current in -process is installed perpendicularly sampling and control system's interference ratio is tens times little, the effectual control system's of preventing mistake is moved, improve equipment's reliability and security.

Description

A kind of lossless degree of depth current-limiting apparatus of discrete

Technical field

This utility model relates to electrical equipment technical field, is specifically related to a kind of lossless degree of depth current-limiting apparatus of discrete.

Background technology

The current restriction to short circuit current, two kinds of technology of main employing, a kind of technology is to be sealed in by current-limiting reactor in the middle of major loop to ensure when the back segment of reactor is short-circuited, and directly short circuit current is limited. Another kind of technology is then that reactor is done little by employing, and be contained in after intrinsic switch in parallel in access system, time properly functioning, switch is by reactor short circuit, and when circuit is short-circuited at back segment, switch is quickly opened, reactor is put in short-term, limit current to, when after failure removal, then switch is put into "on" position recover properly functioning.

All there is more weak point in both technology. The first direct study of series reactor current-limiting technology Problems existing, mainly volume do relatively big, the current limliting degree of depth is limited, and energy consumption is relatively big in running, and electromagnetic interference is serious, runs uneconomical; The second zero loss current limiting technique Problems existing, is mainly contained in the reactor on Switch main body in putting into operation, owing to electromagnetic field is too strong, the interference of following controller is very serious, easily causes control system malfunction; Simultaneously as it is relatively big to open reactor induction electromotive force amplitude in commutation course at switch, dv/dt is higher, it is possible to make switch in commutation course can not blow-out and cause commutation failure, it also occur that accident time serious.

Utility model content

Technical problem to be solved in the utility model is in that to provide a kind of magnetic interference little, it is prevented that control system malfunction, and it can be avoided that the lossless degree of depth current-limiting apparatus of discrete that likely can not extinguish of commutation course breaker in middle.

Technical problem to be solved in the utility model realizes by the following technical solutions:

A kind of lossless degree of depth current-limiting apparatus of discrete, controls integrated apparatus including degree of depth current-limiting reactor and change of current switching, and described degree of depth current-limiting reactor is arranged on the side mode in parallel of change of current switching control integrated apparatus and connects; By independently installed for degree of depth current-limiting reactor, and be connected with change of current switching control integrated apparatus, so that the high-intensity magnetic field that the reactor in commutation course produces is little tens times to the interference ratio right angle setting of sampling and control system, effectively prevent the malfunction of control system, improve reliability and the safety of equipment.

Described change of current switching control integrated apparatus include insulation burrel, high-speed switch, press down steepness energy absorber, Rogowski coil, control system, lower insulation burrel, insulating power supply and hot cooling system; Wherein high-speed switch is installed in insulation burrel, described high-speed switch and by upper and lower junction block be connected copper bar connection after, then be respectively coupled to top and the bottom lead-out wire of insulation burrel, be then connected with degree of depth current-limiting reactor;

The described steepness energy absorber that presses down is connected to the upper and lower junction block two ends of high-speed switch; The amplitude of effective over-voltage and steepness, it is prevented that resume combustion when cut-offfing.

Described control system is arranged in the maintenance joint in the middle of insulation burrel and lower insulation burrel, and is connected with the Rogowski coil on Switch main body; After the power supply of described control system is connected with insulating power supply secondary, then it is connected with external ac power source by insulating power supply primary.

Described high-speed switch adopts eddy current to drive, magnetic energy homogenizing controls, the device that permanent-magnet bistable keeps.

The parameter designing of degree of depth current-limiting reactor, it is only necessary to consider the degree of depth needing current limliting and need the time run, meeting corresponding dynamic stability and hot stability requirement, that therefore can be done by volume is only small, and floor space is little.

The operation principle of the present invention illustrates as follows;

(1) discrete degree of depth current-limiting reactor adopts through-flow in short-term, parameter value according to current limliting depth design reactor, its mounting means adopts to be in parallel with change of current switching control integrated apparatus and is connected, owing to controlling system and measuring cell in the side of reactor, interference of electromagnetic field Amplitude Ration that it can be subject to controls system and interference of electromagnetic field amplitude when measuring cell is contained in reactor lower end wants little tens times, the degree that control system is disturbed is made to decline to a great extent, thus substantially increasing the safety in operation of device.

(2) change of current switching controls the junction block two ends up and down of the high-speed switch in integrated apparatus, connect and press down steepness energy absorber, its effect is, when device back segment (subordinate) is short-circuited, controller sends order makes high-speed switch action separating brake carry out the change of current, short circuit current is proceeded to reactor and carries out degree of depth current limliting, the moment of reactor it is transformed at electric current, reactor will produce the induced potential that amplitude is higher, steepness is bigger, this electromotive force acts on high-speed switch fracture two ends, it is possible to make switch blow-out difficulty or can not blow-out and cause commutation failure. After pressing down steepness energy absorber and be connected on the two ends of switch fracture, the amplitude of electromotive force can be limited, the steepness of electromotive force be limited simultaneously and reduce, with the extinguishing condition of satisfied switch fracture electric arc, it is ensured that safe and reliable cut-offs and complete the change of current.

(3) course of action of device, under normal circumstances high-speed switch close a floodgate, by with it and the degree of depth current-limiting reactor short circuit connect put into operation. when short circuit occurs, after control system is sampled by Rogowski coil and is judged the minimum working current value that current amplitude exceedes setting, controller is through the algorithm of the specific function of design, calculate short circuit current angle accurately, the zero crossing of amplitude and twice, then separating brake order is sent to high-speed switch in the ms time before the current zero-crossing point time delay a period of time, perform separating brake, when damming before current zero-crossing point and disconnecting, electric current is truncated the change of current moment to reactor, it is higher that reactor will produce amplitude, the transient overvoltage that steepness is bigger, and act on the fracture of high-speed switch, if the steepness of this overvoltage is more than the resume speed of switch internal dielectric, the resume combustion of switch fracture will be occurred can not to complete to cut-off, cause commutation failure. now, the steepness energy absorber that presses down being installed on fracture two ends plays a role, and overvoltage is limited in relatively low amplitude on the one hand, on the other hand steepness restriction is reduced to the scope having allowed to cut-off, help the success of high-speed switch Safe commutation, it is achieved the target of degree of depth current limliting.

The beneficial effects of the utility model are: this utility model reasonable in design, by the holographic control under overvoltage, reverse time limiting current and instantaneous over-current protection structure short trouble, substantially increase the Reliability of Microprocessor of series compensation device.

Accompanying drawing explanation

Fig. 1 is this utility model structural representation;

Fig. 2 is that this utility model presses down steepness energy absorber structure chart.

Detailed description of the invention

For the technological means making this utility model realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with being specifically illustrating, this utility model is expanded on further.

Referring to Fig. 1, a kind of lossless degree of depth current-limiting apparatus of discrete, control integrated apparatus 2 including degree of depth current-limiting reactor 1 and change of current switching, degree of depth current-limiting reactor 1 is arranged on the side mode in parallel of change of current switching control integrated apparatus 2 and connects; By independently installed for degree of depth current-limiting reactor 1, and be connected with change of current switching control integrated apparatus 2, so that the high-intensity magnetic field that the reactor in commutation course produces is little tens times to the interference ratio right angle setting of sampling and control system, effectively prevent the malfunction of control system, improve reliability and the safety of equipment.

Change of current switching control integrated apparatus 2 include insulation burrel 3, high-speed switch 4, press down steepness energy absorber 5, Rogowski coil 6, control system 7, lower insulation burrel 8, insulating power supply 9 and hot cooling system 10; Wherein high-speed switch 4 is installed in insulation burrel 3, high-speed switch and 4 by upper and lower junction block be connected copper bar connection after, then be respectively coupled to top and the bottom lead-out wire of insulation burrel 4, be then connected with degree of depth current-limiting reactor 1; Press down steepness energy absorber 5 and be connected to the upper and lower junction block two ends of high-speed switch 4; The amplitude of effective over-voltage and steepness, it is prevented that resume combustion when cut-offfing. Control system 7 is arranged in the maintenance joint in the middle of insulation burrel 3 and lower insulation burrel 8, and is connected with the Rogowski coil 6 on Switch main body; After 9 levels of the power supply of control system 7 and insulating power supply are connected, then being connected with external ac power source by insulating power supply 9 primary, insulating power supply 9 is arranged in lower insulation burrel 8. High-speed switch 4 adopts eddy current to drive, magnetic energy homogenizing controls, the device that permanent-magnet bistable keeps. The parameter designing of degree of depth current-limiting reactor 1, it is only necessary to consider the degree of depth needing current limliting and need the time run, meeting corresponding dynamic stability and hot stability requirement, that therefore can be done by volume is only small, and floor space is little.

The operation principle of the present invention illustrates as follows;

(1) discrete degree of depth current-limiting reactor adopts through-flow in short-term, parameter value according to current limliting depth design reactor, its mounting means adopts to be in parallel with change of current switching control integrated apparatus and is connected, owing to controlling system and measuring cell in the side of reactor, interference of electromagnetic field Amplitude Ration that it can be subject to controls system and interference of electromagnetic field amplitude when measuring cell is contained in reactor lower end wants little tens times, the degree that control system is disturbed is made to decline to a great extent, thus substantially increasing the safety in operation of device.

(2) change of current switching controls the junction block two ends up and down of the high-speed switch in integrated apparatus, connect and press down steepness energy absorber, its effect is, when device back segment (subordinate) is short-circuited, controller sends order makes high-speed switch action separating brake carry out the change of current, short circuit current is proceeded to reactor and carries out degree of depth current limliting, the moment of reactor it is transformed at electric current, reactor will produce the induced potential that amplitude is higher, steepness is bigger, this electromotive force acts on high-speed switch fracture two ends, it is possible to make switch blow-out difficulty or can not blow-out and cause commutation failure. After pressing down steepness energy absorber and be connected on the two ends of switch fracture, the amplitude of electromotive force can be limited, the steepness of electromotive force be limited simultaneously and reduce, with the extinguishing condition of satisfied switch fracture electric arc, it is ensured that safe and reliable cut-offs and complete the change of current.

(3) course of action of device, under normal circumstances high-speed switch close a floodgate, by with it and the degree of depth current-limiting reactor short circuit connect put into operation. when short circuit occurs, after control system is sampled by Rogowski coil and is judged the minimum working current value that current amplitude exceedes setting, controller is through the algorithm of the specific function of design, calculate short circuit current angle accurately, the zero crossing of amplitude and twice, then separating brake order is sent to high-speed switch in the ms time before the current zero-crossing point time delay a period of time, perform separating brake, when damming before current zero-crossing point and disconnecting, electric current is truncated the change of current moment to reactor, it is higher that reactor will produce amplitude, the transient overvoltage that steepness is bigger, and act on the fracture of high-speed switch, if the steepness of this overvoltage is more than the resume speed of switch internal dielectric, the resume combustion of switch fracture will be occurred can not to complete to cut-off, cause commutation failure. now, the steepness energy absorber that presses down being installed on fracture two ends plays a role, and overvoltage is limited in relatively low amplitude on the one hand, on the other hand steepness restriction is reduced to the scope having allowed to cut-off, help the success of high-speed switch Safe commutation, it is achieved the target of degree of depth current limliting.

Referring to Fig. 2, pressing down steepness energy absorber 5 and include acceptor of energy 51 and steepness suppressor 52, acceptor of energy 51 is connected in parallel by the row of extraction 53 with steepness suppressor 52. Acceptor of energy 51 includes insulating epoxy bucket 511, upper junction block 512, lower junction block 513, built-in disconnector 514, upper aluminum cock 515, lower aluminum cock 516, zinc oxide valve plate 517, zinc oxide valve plate 517 is positioned in the middle part of insulating epoxy bucket 511, zinc oxide valve plate 517 top is connected with built-in disconnector 514, bottom is connected with lower aluminum cock 516, being connected with lower junction block 513 through a spring flower pad bottom lower aluminum cock 516, upper junction block 512, lower junction block 513 are each through being bolted on insulating epoxy bucket 511; Upper aluminum cock 515 arranges between junction block 512 and built-in disconnector 514; Steepness suppressor 52 includes insulation crust 521, is provided with the built-in thin-film capacitor of two series connection in insulation crust 521, and insulation crust 521 top is connected to junction block 522, and bottom is connected to lower junction block 523, and upper and lower junction block connects with thin-film capacitor.

Of the present utility model ultimate principle and principal character and of the present utility model advantage have more than been shown and described. Skilled person will appreciate that of the industry; this utility model is not restricted to the described embodiments; described in above-described embodiment and description is that principle of the present utility model is described; under the premise without departing from this utility model spirit and scope; this utility model also has various changes and modifications, and these changes and improvements both fall within the scope of claimed this utility model. This utility model claims scope and is defined by appending claims and equivalent thereof.

Claims (3)

1. the lossless degree of depth current-limiting apparatus of discrete, it is characterised in that include degree of depth current-limiting reactor and change of current switching controls integrated apparatus, described degree of depth current-limiting reactor is arranged on the side mode in parallel of change of current switching control integrated apparatus and connects.

2. a kind of lossless degree of depth current-limiting apparatus of discrete according to claim 1, it is characterized in that, described change of current switching control integrated apparatus include insulation burrel, high-speed switch, press down steepness energy absorber, Rogowski coil, control system, lower insulation burrel, insulating power supply and hot cooling system; Wherein high-speed switch is installed in insulation burrel, described high-speed switch and by upper and lower junction block be connected copper bar connection after, then be respectively coupled to top and the bottom lead-out wire of insulation burrel, be then connected with degree of depth current-limiting reactor;

The described steepness energy absorber that presses down is connected to the upper and lower junction block two ends of high-speed switch; The amplitude of effective over-voltage and steepness, it is prevented that resume combustion when cut-offfing;

Described control system is arranged in the maintenance joint in the middle of insulation burrel and lower insulation burrel, and is connected with the Rogowski coil on Switch main body; After the power supply of described control system is connected with insulating power supply secondary, then it is connected with external ac power source by insulating power supply primary.

3. a kind of lossless degree of depth current-limiting apparatus of discrete according to claim 2, it is characterised in that described insulating power supply is arranged in lower insulation burrel.