CN102222878A - Phase-failure protection structure of reactive power compensation device - Google Patents
Phase-failure protection structure of reactive power compensation device Download PDFInfo
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- CN102222878A CN102222878A CN2011101650431A CN201110165043A CN102222878A CN 102222878 A CN102222878 A CN 102222878A CN 2011101650431 A CN2011101650431 A CN 2011101650431A CN 201110165043 A CN201110165043 A CN 201110165043A CN 102222878 A CN102222878 A CN 102222878A
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Abstract
The invention relates to a phase-failure protection structure of a reactive power compensation device. The phase-failure protection structure comprises a composite throw in/off switch connected with a three-phase power supply, and three fuse protectors with auxiliary contacts; normally closed auxiliary contacts of the three fuse protectors are sequentially connected in series; and a front end lead-out terminal is connected with a common anode input terminal of the composite throw in/off switch and the three-phase power supply respectively so that the composite throw in/off switch, the three fuse protectors with the auxiliary contacts and the three-phase power supply are connected in series to form a loop. The phase-failure protection structure of the reactive power compensation device can quickly cut the control of a compensation controller and the composite throw in/off switch over a branch when any phase of the branch fails, so as to excellently avoid the unbalanced voltage and current phenomenon due to unbalanced three-phase input of a capacitor caused by phase-failure, and eliminate the series risks caused by the phenomenon.
Description
Technical field
The present invention relates to the open-phase protection structure of reactive power compensator.
Background technology
Reactive power compensation is the power factor that works to improve electrical network in the electronic power system, reduces the loss of supply transformer and conveying circuit, improves power supplying efficiency, improves the power supply environment.Reactive power compensator is in an indispensable very important position in power supply system.Reasonably select compensation arrangement, can accomplish to reduce to greatest extent the loss of network, power grid quality is improved.Otherwise, as selecting or improper use, may cause electric power system, voltage fluctuation, harmonic wave increases etc. are all multifactor.
Traditional reactive power compensator is made up of devices such as circuit breaker, contactor, thermal relay, capacitors, adopts common three-phase, jumbo capacitor to carry out three-phase and mends the mode switching altogether.There is serious inrush phenomenon in this class compensation arrangement in the switching process of capacitor, produce throw in-of oscillation, and main noddle on contactor easily burns, and has significantly reduced the useful life of capacitor.In recent years, along with the develop rapidly of power electronic technology, and various corresponding defencive functions is constantly perfect, and the composite switching switch has progressively substituted the position of contactor in traditional reactive power compensator in reactive power compensation and filter with its superior switching characteristic.The composite switching switch utilizes the contactless characteristics of electronic device such as thyristor, make its no-spark in the switched capacitor process, do not produce and shove, no throw in-of oscillation, noiseless, response speed fast (in the microsecond level, open, turn-off), efficient height, cost is low, and this a series of advantage makes the composite switching switch be widely used in low-voltage reactive compensator capable.But also has the shortcoming of overload capacity difference simultaneously as the electronic devices such as thyristor of composite switching switch main composition original paper, if overload or flashy short circuit just might make its puncture.Therefore when using, its defencive function is also paid attention to especially.Generally be in major loop, to seal in fast acting fuse at present, under situation about breaking down, disconnect major loop fast, guarantee that the composite switching switch is not burnt, also can guarantee the Secure Application of entire equipment simultaneously.Traditional as shown in Figure 1 multiloop collocation structure schematic diagram, FU is a fast acting fuse among the figure, and K is the composite switching switch, and C is a three-phase capacitor, and L is a reactor.In the composite switching K switch, V is the anodal input of common port, and N is the zero line input of composite switching switch, and K1 is the negative pole control signal.
As seen from Figure 1, three-phase capacitor C is actually three single-phase electricity containers is connected into triangle in inside by delta connection, draws A, B, C three-phase terminal again.Hence one can see that: short trouble appears in a certain phase in arbitrary branch road (perhaps two-phase), the fast acting fuse FU of its connection disconnects immediately, the capacitor of this phase (perhaps two-phase) can't drop into again so, but the reactive power compensation controller can't detect this situation, still can provide the input signal to the capacitor of all the other two-phases (or a phase), will cause the three-phase imbalance of system voltage or electric current like this, produce multiple harm, comprise:
The tri-phase iron core reactor phase-deficient operation of 1, connecting in the reactive power compensator, generation is uttered long and high-pitched sounds, and shortens the life-span because certain is mutually overheated simultaneously, adds lossy;
2, influence all the other equipment and normally move, move under asymmetrical state such as electric rotating machine, can make rotor produce supplementary load loss and heating, thereby cause motor integral body or local heating, the opposing magnetic field produces additional moment and can make motor appearance vibration in addition;
3, reduce the utilance of power system capacity, increase the grid loss, reduce the electrical network energy transmission efficiency;
4, cause with the negative sequence component to be the kinds of protect generation misoperation of starting component, directly threaten the safe operation of electrical network.
The present compensation controller that adopts; though can detect the phase shortage situation of whole system; possesses the open-phase protection function; but for the phase shortage among a small circle that this a certain branch road took place is not possess detection and protective capability; therefore in the design reactive power compensator; must solve when this class fault takes place, can be rapidly the capacitor complete resection that the phase shortage branch road takes place, to remove a hidden danger.
Summary of the invention
The invention provides a kind of open-phase protection structure of reactive power compensator; when arbitrary branch road arbitrary breaks down mutually; can disconnect fast between compensation controller and the composite switching switch the control of this branch road, this branch road can not be dropped into before the fault eliminating again.Solution is also eliminated a series of harm that cause because of voltage, current imbalance simultaneously because of the uneven phenomenon that causes voltage, current imbalance of capacitor three-phase input that phase shortage causes.
The open-phase protection structure of reactive power compensator of the present invention; comprise the composite switching switch that is connected with three phase mains; also comprise three fuses that have auxiliary contact; after the normally closed auxiliary contact of described three fuses connected successively; the head and the tail leading-out terminal connects public electrode input end of composite switching switch and three phase mains respectively, makes between composite switching switch, three auxiliary contact fuses and the three phase mains and is connected into the loop.
The auxiliary contact of fuse are divided into normally opened contact and normally-closed contact, and operation principle is for working as fuse just often, and its normally opened contact disconnects, and normally-closed contact is connected.After fuse blows, its normally opened contact closure, normally-closed contact disconnects, and promptly normally opened contact and normally-closed contact state exchange.The normally closed auxiliary contact of the present invention by three corresponding fuses of handle and A, B, C three is together in series successively and is connected into the loop with the composite switching switch series, after wherein arbitrary fuse fuses because of reasons such as current overloads, its normally closed point disconnects, series loop has also just disconnected, whole loop also just can not proper communication, plays the effect of the control loop that disconnects this branch road thus.
Further scheme is, also include the compensation controller, the negative pole control signal end of described composite switching switch is connected with the control signal output ends of compensation controller, and three auxiliary contact that described three fuses are connected are to be connected with three phase mains by the common port that compensates controller.Export by the common port of compensation controller and to control fuse and whether fuse.
The compensation controller analyzes power factor at that time by gathering the current and voltage signals of three phase mains.If power factor does not reach requirement, then need to drop into electric capacity and compensate, at this moment compensate controller and send the output that signal is given correspondence, after corresponding composite switching switch receives this signal, conducting composite switching switch, this branch road electric capacity is also with regard to input compensation.
Further, the current input terminal of described compensation controller is connected with current transformer.The voltage and current that the compensation controller need be gathered three phase mains could computational analysis goes out power factor at that time, thereby sends control signal according to the height of at that time power factor.The collection of voltage signal is to finish by direct access A, B, C voltage in three phases, and current signal is then by the current transformer collection.
Open-phase protection structure by reactive power compensator of the present invention; can be after arbitrary branch road arbitrary breaks down mutually; to the control of this branch road, this branch road before getting rid of, fault can not be dropped into again between quick disconnection compensation controller and the composite switching switch.Can be good at solving the uneven phenomenon that causes voltage, current imbalance of the capacitor three-phase input that causes because of phase shortage, also eliminated a series of harm that therefore cause simultaneously.
Below in conjunction with embodiment, foregoing of the present invention is described in further detail again by the accompanying drawing illustrated embodiment.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.Do not breaking away under the above-mentioned technological thought situation of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Description of drawings
Fig. 1 is one of them branch road structural representation of traditional multiloop reactive power compensator.
Fig. 2 is the structural representation of the open-phase protection structure of reactive power compensator of the present invention.
Embodiment
The open-phase protection structure of reactive power compensator of the present invention as shown in Figure 2; comprise compensation controller JK and the composite switching K switch that is connected with three phase mains A, B, C; input port A1, the B1 of composite switching K switch, C1 and output port A2, B2, the C2 input and output of corresponding three phase mains respectively; V is the anodal input of the common port of composite switching K switch; N is the zero line input of composite switching switch, and K1 is a negative pole control signal end.Between composite switching K switch and three phase mains, be in series with fast acting fuse FU and reactor L.Also comprise three fuses that have auxiliary contact, be respectively the first fuse a1, the second fuse a2 and the 3rd fuse a3, after the normally closed auxiliary contact of described three fuse a1～a3 connected successively, the head and the tail leading-out terminal connects the common port V1 of compensation controller JK and the public electrode input end V of composite switching K switch respectively, makes composite switching K switch, three fuse a1～a3 and compensate between the controller JK to be connected into the loop.
Compensation controller JK middle port Ub and the Uc voltage input of corresponding three phase mains B, C respectively (or port Ua, Ub, corresponding three phase mains A, B, the C of being connected of Uc), port Ia and grounding ports In are connected with current transformer TA, the electric current of corresponding A phase power supply input (or Ia, Ib, Ic, In connect current transformer TA).Port one～12 are control signal output ends, can distinguish the corresponding negative pole control signal end K1 that connects the composite switching K switch of a plurality of branch roads.
Compensation controller JK analyzes power factor at that time by gathering A phase, B phase and the C current/voltage signal of power supply mutually.If power factor does not reach requirement, then need to drop into electric capacity and compensate, at this moment compensate controller JK and send the output that control signal is given correspondence, after corresponding composite switching K switch receives this signal, carry out conducting, this branch road electric capacity is also with regard to input compensation.After arbitrary phase (or two-phase) breaks down, this mutually pairing fuse is disconnected at once, its normally closed auxiliary contact also disconnects, control loop between compensation controller JK and this branch road composite switching K switch also is in off-state, even compensation controller JK has sent the input signal like this, the composite switching K switch of this branch road does not receive yet, and this branch road also just can't carry out switching.Have only after fixing a breakdown, the change of fuse with breaking down has reconnected control loop, and compensation controller JK could send effective input signal to this branch road, allows this group capacitor put into operation.Whole apparatus structure is simple, stability is high, can not take the space of compensation arrangement, does not increase cost substantially, also well solve the uneven phenomenon that causes voltage, current imbalance of the capacitor three-phase input that causes because of phase shortage simultaneously, eliminated a series of harm that therefore cause.
Claims (3)
1. the open-phase protection structure of reactive power compensator; comprise the composite switching switch that is connected with three phase mains; it is characterized by: also comprise three fuses that have auxiliary contact; after the normally closed auxiliary contact of described three fuses connected successively; the head and the tail leading-out terminal connects public electrode input end of composite switching switch and three phase mains respectively, makes between composite switching switch, three auxiliary contact fuses and the three phase mains and is connected into the loop.
2. the open-phase protection structure of reactive power compensator as claimed in claim 1; it is characterized by and also include the compensation controller; the negative pole control signal end of described composite switching switch is connected with the control signal output ends of compensation controller, and three auxiliary contact that described three fuses are connected are to be connected with three phase mains by the common port that compensates controller.
3. the open-phase protection structure of reactive power compensator as claimed in claim 2, the current input terminal that it is characterized by described compensation controller is connected with current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101650431A CN102222878A (en) | 2011-06-20 | 2011-06-20 | Phase-failure protection structure of reactive power compensation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101650431A CN102222878A (en) | 2011-06-20 | 2011-06-20 | Phase-failure protection structure of reactive power compensation device |
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| CN2011101650431A Pending CN102222878A (en) | 2011-06-20 | 2011-06-20 | Phase-failure protection structure of reactive power compensation device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035919U (en) * | 1988-09-19 | 1989-04-12 | 宁从志 | Screw base fuse with phase interruption protector |
| CN2506008Y (en) * | 2001-09-07 | 2002-08-14 | 邵治东 | Three phase motor fuse blowout phase protective device |
| CN201061147Y (en) * | 2007-07-30 | 2008-05-14 | 中冶东北建设有限公司 | Automatic switching compound control device of static reactive compensator |
| CN201204461Y (en) * | 2008-05-07 | 2009-03-04 | 南通富士特电力自动化有限公司 | Intelligent low-voltage reactive compensation synthesis module |
| CN201219200Y (en) * | 2008-07-01 | 2009-04-08 | 乐山一拉得电网自动化有限公司 | Non-flow low-voltage reactive power compensation set |
-
2011
- 2011-06-20 CN CN2011101650431A patent/CN102222878A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035919U (en) * | 1988-09-19 | 1989-04-12 | 宁从志 | Screw base fuse with phase interruption protector |
| CN2506008Y (en) * | 2001-09-07 | 2002-08-14 | 邵治东 | Three phase motor fuse blowout phase protective device |
| CN201061147Y (en) * | 2007-07-30 | 2008-05-14 | 中冶东北建设有限公司 | Automatic switching compound control device of static reactive compensator |
| CN201204461Y (en) * | 2008-05-07 | 2009-03-04 | 南通富士特电力自动化有限公司 | Intelligent low-voltage reactive compensation synthesis module |
| CN201219200Y (en) * | 2008-07-01 | 2009-04-08 | 乐山一拉得电网自动化有限公司 | Non-flow low-voltage reactive power compensation set |
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Application publication date: 20111019 |