CN104660056A - General three-phase commutation switching main circuit and working method thereof - Google Patents
General three-phase commutation switching main circuit and working method thereof Download PDFInfo
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- CN104660056A CN104660056A CN201510085416.2A CN201510085416A CN104660056A CN 104660056 A CN104660056 A CN 104660056A CN 201510085416 A CN201510085416 A CN 201510085416A CN 104660056 A CN104660056 A CN 104660056A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 19
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/32—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by dynamic converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a general three-phase commutation switching main circuit and a working method thereof and relates to a commutation switching circuit. Currently, low-voltage power grids generally adopt a three-phase four-wire system power distribution method, and due to a large quantity of single-phase loads and the power consumption asynchronism, three-phase imbalance operation of distribution transformers is inevitable. The circuit comprises a four-in four-out commutation convertor, wherein the four-in four-out commutation convertor comprises six commutation modules, each commutation module comprises four input ends, four output ends, switches for connecting the input ends and the output ends, a closing relay and a blocking relay, every four input ends are connected with four incoming lines, every four output ends are connected with four outgoing lines, every four input ends comprise three phases of input ends and a neutral input end, every four output ends comprise three phases of output ends and a neutral output end, and the six commutation modules correspond to different phase line connecting methods. Commutation operation of the circuit is facilitated, the structure is simple, timely commutation and uninterrupted power supply commutation are realized, and lines are not required to be connected and inserted any more.
Description
Technical field
The present invention relates to a kind of commutation built-up circuit, especially a kind of general three-phase commutation switching main circuit.
Background technology
At present in China for low voltage electric network, generally all adopt three-phase four-wire system distribution system, distribution transformer is Yyn0 wiring.Due to a large amount of single-phase loads and electricity consumption asynchronism, therefore the three-phase imbalance of distribution transformer runs is inevitable.Three-phase voltage or the asymmetric meeting of electric current cause a series of harm to the generating in electric power system, transmission of electricity, controller switching equipment and power consumption equipment, are in particular in: (1); Degree of unbalance is larger, and line loss is also larger; (2); Existing 10/0.4kV low voltage distribution transformer mostly is Y/yn0 connection.Such transformer, when secondary side laod unbalance and when having neutral line current, neutral line current is zero-sequence current, and primary side is due to without mid point lead-out wire, and therefore zero-sequence current cannot circulate, therefore zero-sequence current cannot ampere-turn equilibrium; When zero-sequence current is excessive cause zero sequence fluxes excessive time, cross conference due to neutral point drifting and cause some phase voltage too high and cause iron core cutter, iron loss is sharply increased.(3): during three-phase load unbalance, its maximum output can only by maximum one being no more than rated capacity mutually and being limited in three-phase load, load light with regard to surplus capacity, thus transformer is exerted oneself reduction, and transformer is exerted oneself, reduction degree is relevant with the degree of balance, degree of unbalance is larger, and reduction degree of exerting oneself is larger.Meanwhile, the overload capacity of distribution transformer also reduces." when selecting the three-phase transformer of Yyn0 wiring group; its electric current caused by single-phase uncompensated load must not exceed 25% of low pressure winding rated current, and wherein the electric current of a phase must not exceed load current value at full load to GB GB 50052-95 the 6.08th article regulation." due to afore mentioned rules, limit Yyn0 wiring distribution transformer and connect the capacity using single-phase load, also have impact on making full use of of transformer equipment ability.(4): the three-phase voltage asymmetry that three-phase load unbalance causes, will produce backward rotating magnetic field in induction electric machine stator, motor runs under the effect of forward and inverse two sequence rotating magnetic fields.Because positive sequence rotating magnetic field is than backward rotary magnetic field intensity, so motor direction of rotation is constant.But because the impedance of rotor backward is little, therefore backward electric current is large.Converse field, backward electric current, by producing larger braking moment, make output power of motor reduce, and winding temperature raises, and jeopardizes motor safe operation.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition carries out improving to prior art and improves, and provides a kind of general three-phase commutation switching main circuit and method of work thereof, to realize the object of uninterrupted power supply commutation.For this reason, the present invention takes following technical scheme.
A kind of general three-phase commutation switching main circuit, comprise four to enter four and go out commutated converter, described four enter four goes out commutated converter and comprises six commutation modules, six commutation modules include four-input terminal and four outputs, connect the switch of input and output, for the closing relay closed a floodgate, for the blocking relay of locking, four-input terminal is connected with four inlet wires, four outputs are connected with four outlets, four-input terminal is three-phase input end and neutral input end, four outputs are three-phase output end, neutral output, the phase line connected mode that six commutation modules are corresponding different, switch the conversion that commutation module realizes phase line.
As improving further and supplementing technique scheme, the present invention also comprises following additional technical feature.
The change that the three-phase output end phase line of commutation module connects forms six kinds of different modes of connection and corresponding six commutation modules, and the change of the switch on and off of commutation module realizes the change of phase line connection.
When a commutation module needs to connect, by the blocking relay power-off of this commutation module, closing relay energising realizes the closed of switch; The closing relay power-off of remaining commutation module simultaneously, blocking relay is energized, and realizes the interlocking of six commutation modules.
Four enter four goes out commutated converter and is arranged on the breakout mains side of all three-phase and four-lines of low voltage electric network, breakout load side, user's house lead in point and/or three-phase and four-line and transfers on the node of quarter-phase circuit.
A method of work for general three-phase commutation switching main circuit, comprises the following steps
1) order is received;
2) when the order received is for all disconnecting, by complete for all closing relays dead electricity, all knife switches are made all to disengaged position; When receive order be inverting module S is opened time, take turns examine former closing position;
3) judge that whether inverting module closing relay is charged;
4) when closing relay does not have charged, judge whether this inverting module is the inverting module S that need open; If not the inverting module S that need open, then return step 3), next inverting module closing relay is judged, until complete the judgement of whole inverting module; If when this inverting module is the inverting module S that need open, the locking of this inverting module is opened, closing relay is energized, realizes closing a floodgate according to phase selection, namely realize the leading energising choosing phase;
5) when closing relay is charged, judge that whether blocking relay is charged, if blocking relay is charged, then return step 3), next inverting module closing relay is judged, until complete the judgement of whole inverting module; If blocking relay is not charged, judge whether this inverting module is the inverting module S that need open, when this inverting module is the inverting module S that need open, alarm: previous status is consistent with command word, this order is invalid; When this inverting module is not the inverting module S that need open, then think that this inverting module is the inverting module of former closing position, record the "on" position of this inverting module, return step 3), next inverting module closing relay is judged, until complete the judgement of whole inverting module;
6) power operation is done to the closing relay of the inverting module of record "on" position, namely realize the interruption of power supply of former energized phase.
Beneficial effect: the technical program facilitates the commutation of circuit to operate, structure is simple, and commutation in time and realize uninterrupted power supply commutation, need not patch cord again.
Accompanying drawing explanation
Fig. 1 four enters four and goes out transducer external cabling schematic diagram.
Fig. 2 four enters two and goes out transducer external cabling schematic diagram.
Fig. 3 is that four types, four enter two and go out transducer at low-voltage network and the typical scene at user's internal wiring
Fig. 4 is commutation inside modules wiring schematic diagram.
Fig. 5 four enters four and goes out commutated converter back panel wiring schematic diagram.
Fig. 6 is workflow diagram of the present invention.
In figure: 1-tetra-enters four and goes out commutated converter; 101-commutation module; 102-input; 103-output; 104-switch; 105-blocking relay; 106-closing relay; 2-tetra-enters two and goes out transducer.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.
As Fig. 1, 4, shown in 5, the present invention includes four to enter four and go out commutated converter 1 and be called for short four type transducers, described four enter four goes out commutated converter 1 and comprises six commutation modules 101, six commutation modules 101 include four-input terminal 102 and four outputs 103, connect the switch 104 of input 102 and output 103, for the closing relay 106 closed a floodgate, for the blocking relay 105 of locking, four-input terminal 102 is connected with four inlet wires, four outputs 103 are connected with four outlets, four-input terminal 102 is three-phase input end 102 and neutral input end 102, four outputs 103 are three-phase output end 103, neutral output 103, the phase line connected mode that six commutation modules 101 are corresponding different, switch the conversion that commutation module 101 realizes phase line.
That supposes 3 phase 4 line power supplys is denoted as A, B, C mutually, and the neutral line is N, and the phase of 3 phase 4 specific electric loads is also denoted as a, b, c, and center line is n, then this load and the connection of 3 phase 4 line power supplys only have 6 kinds of possibilities, namely
6 kinds of possible states that table 1 three-phase four-wire power is connected with three-phase and four-line load
The change that three-phase output end 103 phase line of commutation module 101 connects forms six kinds of different modes of connection and corresponding six commutation modules 101, and the change of switch 104 break-make of commutation module 101 realizes the change of phase line connection.When a commutation module 101 needs to connect, by blocking relay 105 power-off of this commutation module 101, closing relay 106 energising realizes the closed of switch 104; Closing relay 106 power-off of remaining commutation module 101 simultaneously, blocking relay 105 is energized, and realizes the interlocking of six commutation modules 101.
Four enter four goes out breakout mains side or load side, the user's house lead in point that commutated converter 1 can be arranged on all three-phase and four-lines of low voltage electric network; All three-phase and four-lines transfer the node of quarter-phase circuit to.Fig. 3 is a schematic diagram, and wherein thick lines circuit is three-phase and four-line, and hachure is single-phase two wires.
Below 4 kinds of typical apply scenes of common low pressure power distribution network:
Typical scene 1: four enters four and goes out commutated converter 1 and be arranged on low voltage three-phase four-wire circuit and produce bifurcation, and is arranged on its mains side;
Typical scene 2: four enters four and goes out commutated converter 1 and be arranged on low voltage three-phase four-wire circuit and produce bifurcation, and is arranged on its load side;
Typical scene 3: four enters two and goes out transducer 2 and be called for short two type transducers and be arranged on low voltage three-phase four-wire circuit and separate single-phase two wires place; Four enter two goes out the structure of transducer 2 as shown in Figure 2.
Typical scene 4: four enters four and goes out commutated converter 1 and be arranged on before low voltage three-phase four-wire circuit enters the separation of user.
Below 2 kinds of typical apply scenes in user's internal wiring:
Typical scene 5: four enters four and goes out commutated converter 1 and be arranged on low voltage three-phase four-wire circuit and produce bifurcation, and is arranged on its mains side;
Typical scene 6: four enters two and goes out transducer 2 and be arranged on low voltage three-phase four-wire circuit and separate single-phase two wires place.
As shown in Figure 6, method of work step of the present invention is as follows:
1 receives order;
2 when the order received is for all disconnecting, and by complete for all closing relays 106 dead electricity, makes all knife switches 104 all to disengaged position; When receive order be inverting module S is opened time, take turns examine former closing position;
3 judge that whether inverting module closing relay 106 is charged;
4 when closing relay 106 does not have charged, judges whether this inverting module is the inverting module S that need open; If not the inverting module S that need open, then return step 3, next inverting module closing relay 106 is judged, until complete the judgement of whole inverting module; If when this inverting module is the inverting module S that need open, the locking of this inverting module is opened, closing relay 106 is energized, realize closing a floodgate according to phase selection, namely realize the leading energising choosing phase;
5 when closing relay 106 is charged, judges that whether blocking relay 105 is charged, if blocking relay 105 is charged, then returns step 3, judge next inverting module closing relay 106, until complete the judgement of whole inverting module; If blocking relay 105 is not charged, judge whether this inverting module is the inverting module S that need open, when this inverting module is the inverting module S that need open, alarm: previous status is consistent with command word, this order is invalid; When this inverting module is not the inverting module S that need open, then think that this inverting module is the inverting module of former closing position, record the "on" position of this inverting module, return step 3, next inverting module closing relay 106 is judged, until complete the judgement of whole inverting module;
The closing relay 106 of the inverting module of 6 pairs of record "on" positions does power operation, namely realizes the interruption of power supply of former energized phase.
A major function of this device is " do not have a power failure switching ", therefore adopts first phase selection to be energized, again by the strategy of all original energized phase power-off.
The general three-phase commutation switching main circuit of one shown in above Fig. 1-6 and method of work thereof are specific embodiments of the invention; substantive distinguishing features of the present invention and progress are embodied; can according to the use needs of reality; under enlightenment of the present invention; it is carried out to the equivalent modifications of the aspect such as shape, structure, all at the row of the protection range of this programme.
Claims (5)
1. a general three-phase commutation switching main circuit, it is characterized in that: comprise four and enter four and go out commutated converter (1), described four enter four goes out commutated converter (1) and comprises six commutation modules (101), six commutation modules (101) include four-input terminal (102) and four outputs (103), connect the switch (104) of input (102) and output (103), for the closing relay (106) closed a floodgate, for the blocking relay (105) of locking, four-input terminal (102) is connected with four inlet wires, four outputs (103) are connected with four outlets, four-input terminal (102) is three-phase input end (102) and neutral input end (102), four outputs (103) are three-phase output end (103), neutral output (103), the phase line connected mode that six commutation modules (101) are corresponding different, switch the conversion that commutation module (101) realizes phase line.
2. one according to claim 1 general three-phase commutation switching main circuit, it is characterized in that: the change that three-phase output end (103) phase line of commutation module (101) connects forms six kinds of different modes of connection and corresponding six commutation modules (101), and the change of switch (104) break-make of commutation module (101) realizes the change of phase line connection.
3. one according to claim 1 general three-phase commutation switching main circuit, it is characterized in that: when a commutation module (101) needs to connect, by blocking relay (105) power-off of this commutation module (101), closing relay (106) energising realizes the closed of switch (104); Closing relay (106) power-off of remaining commutation module (101) simultaneously, blocking relay (105) is energized, and realizes the interlocking of six commutation modules (101).
4. one according to claim 1 general three-phase commutation switching main circuit, is characterized in that: four enter four goes out commutated converter (1) and be arranged on the breakout mains side of all three-phase and four-lines of low voltage electric network, breakout load side, user's house lead in point and/or three-phase and four-line and transfer on the node of quarter-phase circuit.
5. a method of work for general three-phase commutation switching main circuit, is characterized in that:
1) order is received;
2) when the order received is for all disconnecting, by complete for all closing relays (106) dead electricity, make all knife switches (104) all to disengaged position; When receive order be inverting module S is opened time, take turns examine former closing position;
3) judge that whether inverting module closing relay (106) is charged;
4) when closing relay (106) does not have charged, judge whether this inverting module is the inverting module S that need open; If not the inverting module S that need open, then return step 3), next inverting module closing relay (106) is judged, until complete the judgement of whole inverting module; If when this inverting module is the inverting module S that need open, the locking of this inverting module is opened, closing relay (106) is energized, realizes closing a floodgate according to phase selection;
5) when closing relay (106) is charged, judge that whether blocking relay (105) is charged, if blocking relay (105) is charged, then return step 3), next inverting module closing relay (106) is judged, until complete the judgement of whole inverting module; If blocking relay (105) is not charged, judge whether this inverting module is the inverting module S that need open, when this inverting module is the inverting module S that need open, alarm: previous status is consistent with command word, this order is invalid; When this inverting module is not the inverting module S that need open, then think that this inverting module is the inverting module of former closing position, record the "on" position of this inverting module, return step 3), next inverting module closing relay (106) is judged, until complete the judgement of whole inverting module;
6) power operation is done to the closing relay (106) of the inverting module of record "on" position.
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| CN201510085416.2A CN104660056B (en) | 2015-02-17 | 2015-02-17 | A kind of general three-phase commutation switching main circuit and its method of work |
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| CN201510085416.2A CN104660056B (en) | 2015-02-17 | 2015-02-17 | A kind of general three-phase commutation switching main circuit and its method of work |
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| CN104660056B CN104660056B (en) | 2017-06-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421625A (en) * | 2020-11-13 | 2021-02-26 | 国网四川省电力公司广元供电公司 | Single-pole double-head phase change switch and reversing equipment |
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| US20040100247A1 (en) * | 2002-11-25 | 2004-05-27 | Tmt&D Corporation | System for compensating a voltage of a negative-phase-sequence component in a power system |
| CN102751733A (en) * | 2012-06-26 | 2012-10-24 | 中国电力科学研究院 | On-line three-phase load unbalance processing method suitable for low-voltage distribution network |
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| JP2014202572A (en) * | 2013-04-04 | 2014-10-27 | 富士電機株式会社 | Power measurement device and power measurement system |
| CN204103486U (en) * | 2014-09-19 | 2015-01-14 | 国家电网公司 | A kind of manually online phase modulation global function subscriber's meter case apparatus |
| CN204497995U (en) * | 2015-02-17 | 2015-07-22 | 国家电网公司 | A kind of general three-phase commutation switching main circuit |
-
2015
- 2015-02-17 CN CN201510085416.2A patent/CN104660056B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06189457A (en) * | 1992-08-17 | 1994-07-08 | Kazuo Arai | Method for efficient use of contract power |
| US20040100247A1 (en) * | 2002-11-25 | 2004-05-27 | Tmt&D Corporation | System for compensating a voltage of a negative-phase-sequence component in a power system |
| CN102751733A (en) * | 2012-06-26 | 2012-10-24 | 中国电力科学研究院 | On-line three-phase load unbalance processing method suitable for low-voltage distribution network |
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| CN103337867A (en) * | 2013-06-28 | 2013-10-02 | 国家电网公司 | Low voltage load online phase modulation device and phase modulation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112421625A (en) * | 2020-11-13 | 2021-02-26 | 国网四川省电力公司广元供电公司 | Single-pole double-head phase change switch and reversing equipment |
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| CN104660056B (en) | 2017-06-06 |
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