CN104660056B - A kind of general three-phase commutation switching main circuit and its method of work - Google Patents
A kind of general three-phase commutation switching main circuit and its method of work Download PDFInfo
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- CN104660056B CN104660056B CN201510085416.2A CN201510085416A CN104660056B CN 104660056 B CN104660056 B CN 104660056B CN 201510085416 A CN201510085416 A CN 201510085416A CN 104660056 B CN104660056 B CN 104660056B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- 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
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- Power Engineering (AREA)
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Abstract
A kind of general three-phase commutation switching main circuit and its method of work, are related to a kind of commutation built-up circuit.At present, frequently with three-phase four-wire system distribution system, due to substantial amounts of single-phase load and electricity consumption asynchronism, therefore the three-phase imbalance operation of distribution transformer is inevitable to low voltage electric network.The present invention enters four and goes out commutated converter including four, four enter four goes out commutated converter includes six commutation modules, six commutation modules include switch, closing relay, the locking relay of four inputs and four output ends, connection input and output end, four inputs are connected with four inlet wires, four output ends are connected with four outlets, four inputs are three-phase input end and neutral input end, and four output ends are three-phase output end, neutral output end, the different phase line connected mode of six commutation module correspondences.The technical program facilitates the commutation of circuit to operate, simple structure, and commutation in time and realizes uninterrupted power supply commutation, it is not necessary to patch cord again.
Description
Technical field
The present invention relates to a kind of commutation built-up circuit, a kind of especially general three-phase commutation switching main circuit.
Background technology
At present in China for low voltage electric network, typically all using three-phase four-wire system distribution system, distribution transformer is
Yyn0 wiring.Due to substantial amounts of single-phase load and electricity consumption asynchronism, thus distribution transformer three-phase imbalance
Operation is inevitable.Three-phase voltage or electric current is asymmetric can be to the generating in power system, transmission of electricity, controller switching equipment and electricity consumption
Equipment causes a series of harm, is in particular in：（1）Increased line loss；Degree of unbalancedness is bigger, and line loss is also got over
Greatly；（2）Increased the active loss of distribution transformer；Existing 10/0.4kV low voltage distribution transformers are generally that Y/yn0 connects
Method.Such transformer, when secondary side laod unbalance and when having neutral line current, neutral line current is zero-sequence current, and
Primary side without midpoint lead-out wire, therefore zero-sequence current due to that cannot circulate, therefore zero-sequence current cannot ampere-turn equilibrium；Work as zero-sequence current
It is excessive when causing zero sequence fluxes excessive, conference is crossed due to neutral point drifting and is caused some phase voltages too high and is caused saturation unshakable in one's determination,
Sharply increase iron loss.（3）Distribution transformer is reduced to exert oneself：During three-phase load unbalance, its EIAJ can only be by three-phase
Maximum one is limited no more than rated capacity in load, load it is light with regard to surplus capacity the reduction so that transformer is exerted oneself, and
Transformer is exerted oneself, and reduction degree is relevant with the degree of balance, and degree of unbalancedness is bigger, and reduction degree of exerting oneself is bigger.Meanwhile, distribution transformer
Overload capacity also reduce.The 6.08th article of regulation of GB GB 50052-95 is " when three phase transformations from Yyn0 wiring groups
Depressor, it must not exceed the 25% of low pressure winding rated current by the electric current that single-phase uncompensated load causes, and a wherein phase
Electric current must not exceed load current value in full load." due to above-mentioned regulation, limit Yyn0 wiring distribution transformers and connect use
The capacity of single-phase load, also have impact on making full use of for transformer equipment ability.（4）Influence output power of motor, and make around
Group temperature is raised：The three-phase voltage asymmetry that three-phase load unbalance is caused, will produce backward to revolve in induction electric machine stator
Turn magnetic field, motor runs in the presence of forward and inverse two sequences rotating excitation field.Because positive sequence rotating excitation field is than backward rotating excitation field
By force, so motor direction of rotation is constant.But because rotor backward impedance is small, therefore backward electric current is big.Converse field, backward electricity
Flowing will produce larger braking moment, reduce output power of motor, and winding temperature is raised, and jeopardizes motor safe operation.
The content of the invention
The technical problem to be solved in the present invention and the technical assignment for proposing are prior art to be improved and is improved,
A kind of general three-phase commutation switching main circuit and its method of work are provided, to realize the purpose of uninterrupted power supply commutation.Therefore, this
Following technical scheme is taken in invention.
A kind of general three-phase commutation switching main circuit, including four enter four and go out commutated converter, described four enter four goes out commutation
Converter includes six commutation modules, and six commutation modules include four inputs and four output ends, connection four inputs and four
The switch of output end, closing relay, the locking relay for locking for closing a floodgate, four inputs are connected with four inlet wires,
Four output ends are connected with four outlets, four inputs be three-phase input end and neutral input end, four output ends be three-phase output end, in
Property output end, the different phase line connected modes of six commutation modules correspondence, switching commutation module realizes the conversion of phase line.
As further improving and supplementing to above-mentioned technical proposal, present invention additionally comprises following additional technical feature.
The change of the three-phase output end phase line connection of commutation module forms six kinds of different modes of connection and six commutations of correspondence
The change of phase line connection is realized in module, the change of the switch on and off of commutation module.
When a commutation module needs to connect, the locking relay of the commutation module is powered off, closing relay is powered real
The closure for now switching；The closing relay power-off of remaining commutation module simultaneously, locking relay is powered, and realizes six commutation moulds
The interlocking of block.
Four enter four goes out commutated converter and is born installed in the branch point mains side of all three-phase and four-lines of low voltage electric network, branch point
Lotus side, user's house lead in point, and/or three-phase and four-line switch on the node of quarter-phase circuit.
A kind of method of work of general three-phase commutation switching main circuit, comprises the following steps
1）Receive order；
2）When receive order for it is all off when, by the full dead electricity of all closing relays, make it is all switch all to take off
From state；When the order for receiving is wheel inspection former closing position when commutation module S is opened；
3）Judge whether commutation module closing relay is powered；
4）When closing relay does not have it is powered when, judge whether the commutation module is the commutation module S that need to be opened；If not needing
The commutation module S of unlatching, then return to step 3）, next commutation module closing relay is judged, until completing all
The judgement of commutation module；If the commutation module is the commutation module S that need to be opened, the locking of the commutation module is opened, will closed
Lock relay power, realization is closed a floodgate according to phase selection, that is, realize choosing the leading energization of phase；
5）When closing relay is powered, judge whether locking relay is powered, if locking relay is powered, return to step
Rapid 3）, next commutation module closing relay is judged, until completing the judgement of whole commutation modules；If locking relay
Device is not charged, judges whether the commutation module is the commutation module S that need to be opened, when the commutation module is the commutation module that need to open
During S, alarm：Original state is consistent with command word, and this order is invalid；When the commutation module is not the commutation module S that need to be opened, then
Think the commutation module that the commutation module is former closing position, record the "on" position of the commutation module, return to step 3）, under
One commutation module closing relay is judged, until completing the judgement of whole commutation modules；
6）Closing relay to recording the commutation module of "on" position does power operation, that is, realize the interruption of former energized phase
Power supply.
Beneficial effect：The technical program facilitates the commutation of circuit to operate, simple structure, and commutation is timely and realizes not middle cut-off
Electric commutation, it is not necessary to patch cord again.
Brief description of the drawings
Fig. 1 is four to enter four and go out converter external cabling schematic diagram.
Fig. 2 is four to enter two and go out converter external cabling schematic diagram.
Fig. 3 is four types, four enters two and go out converter in low-voltage network and the typical scene in user's internal wiring
Fig. 4 is commutation inside modules wiring schematic diagram.
Fig. 5 is four to enter four and go out commutated converter back panel wiring schematic diagram.
It is workflow diagram of the present invention that Fig. 6 is.
In figure：1- tetra- enters four and goes out commutated converter；101- commutation modules；102- inputs；103- output ends；104- is opened
Close；105- locking relays；106- closing relays；2- tetra- enters two and goes out converter.
Specific embodiment
Technical scheme is described in further detail below in conjunction with Figure of description.
As shown in Fig. 1,4,5, the present invention includes that four enter four and go out the four type converters of abbreviation of commutated converter 1, and described four enter
Four go out commutated converter 1 includes six commutation modules 101, and six commutation modules 101 include four inputs 102 and four output ends
103rd, the switch 104 of connection four inputs 102 and four output ends 103, the closing relay 106 for combined floodgate, for locking
Locking relay 105, four inputs 102 are connected with four inlet wires, and four output ends 103 are connected with four outlets, and four inputs 102 are three
Phase input 102 and neutral input end, four output ends 103 are three-phase output end, neutral output end, six commutation modules 101 pairs
Different phase line connected modes, switching commutation module 101 are answered to realize the conversion of phase line.
Assuming that 3 phase 4 line power supply is mutually denoted as A, B, C, the neutral conductor is N, and the phase of the specific electric load of 3 phase 4 is also denoted as
A, b, c, center line are n, then the load only has 6 kinds of possibility with the connection of the line power supply of 3 phase 4, i.e.,
6 kinds of possible states that the three-phase four-wire power of table 1 is connected with three-phase and four-line load
The change of the three-phase output end phase line connection of commutation module 101 forms six kinds of different modes of connection and correspondence six is changed
The change of phase line connection is realized in phase module 101, the change of the break-make of switch 104 of commutation module 101.When a commutation module 101 is needed
When connecting, the locking relay 105 of the commutation module 101 is powered off, closing relay 106 is powered and realizes closing for switch 104
Close；The closing relay 106 of remaining commutation module 101 is powered off simultaneously, and locking relay 105 is powered, and realizes six commutation moulds
The interlocking of block 101.
Four enter four goes out the branch point mains side or negative that commutated converter 1 may be mounted at all three-phase and four-lines of low voltage electric network
Lotus side, user's house lead in point；All three-phase and four-lines switch to the node of quarter-phase circuit.Fig. 3 is a schematic diagram, wherein thick lines circuit
It is three-phase and four-line, hachure is single-phase two wires.
The following is 4 kinds of typical application scenarios of common low pressure power distribution network：
Typical scene 1：Four enter four goes out commutated converter 1 installed in low voltage three-phase four-wire circuit generation bifurcation, and installs
In its mains side；
Typical scene 2：Four enter four goes out commutated converter 1 installed in low voltage three-phase four-wire circuit generation bifurcation, and installs
In its load side；
Typical scene 3：Four enter two go out the referred to as two type converters of converter 2 separated installed in low voltage three-phase four-wire circuit it is single-phase
At two wires；Four enter two go out converter 2 structure it is as shown in Figure 2.
Typical scene 4：Four enter four goes out the separation that commutated converter 1 enters access customer installed in low voltage three-phase four-wire circuit
Before.
The following is 2 kinds of typical application scenarios in user's internal wiring：
Typical scene 5：Four enter four goes out commutated converter 1 installed in low voltage three-phase four-wire circuit generation bifurcation, and installs
In its mains side；
Typical scene 6：Four enter two goes out converter 2 and is separated at single-phase two wires installed in low voltage three-phase four-wire circuit.
As shown in fig. 6, method of work step of the invention is as follows：
1 receives order；
2 when the order for receiving is all off, by the full dead electricity of all closing relays 106, makes all switches 104 all
To disengaged position；When the order for receiving is wheel inspection former closing position when commutation module S is opened；
3 judge whether commutation module closing relay 106 is powered；
4 when closing relay 106 does not have powered, judges whether the commutation module is the commutation module S that need to be opened；If not
The commutation module S that need to be opened, then return to step 3, judge next commutation module closing relay 106, until completing
The judgement of whole commutation modules；If the commutation module is the commutation module S that need to be opened, the locking of the commutation module is opened,
Closing relay 106 is powered, realization is closed a floodgate according to phase selection, that is, realizes choosing the leading energization of phase；
5 when closing relay 106 is powered, judges whether locking relay 105 is powered, if locking relay 105 is powered,
Then return to step 3, judge next commutation module closing relay 106, until completing the judgement of whole commutation modules；
If locking relay 105 is not charged, judge whether the commutation module is the commutation module S that need to be opened, when the commutation module is to need
During the commutation module S of unlatching, alarm：Original state is consistent with command word, and this order is invalid；When the commutation module need to not be opened
During commutation module S, then it is assumed that the commutation module is the commutation module of former closing position, records the "on" position of the commutation module,
Return to step 3, judges next commutation module closing relay 106, until completing the judgement of whole commutation modules；
The closing relay 106 of 6 pairs of commutation modules of record "on" position does power operation, i.e., in the former energized phase of realization
Cut-off electricity.
One major function of the device is " do not have a power failure switching ", thus be powered using first phase selection, again will be all original
The strategy of energized phase power-off.
A kind of general three-phase commutation switching main circuit and its method of work shown in figure 1 above -6 are specific realities of the invention
Apply example, embodied substantive distinguishing features of the present invention and progress, can according to actual use needs, under enlightenment of the invention,
Carry out the equivalent modifications of the aspects such as shape, structure to it, this programme protection domain row.
Claims (5)
1. a kind of general three-phase commutation switching main circuit, it is characterised in that：Enter four including four and go out commutated converter（1）, it is described
Four enter four goes out commutated converter（1）Including six commutation modules（101）, six commutation modules（101）Include four inputs
（102）With four output ends（103）, connection four inputs（102）With four output ends（103）Switch（104）, for close a floodgate conjunction
Lock relay（106）, for the locking relay of locking（105）, four inputs（102）It is connected with four inlet wires, four output ends
（103）It is connected with four outlets, four inputs（102）It is three-phase input end and neutral input end, four output ends（103）For three-phase is defeated
Go out end, neutral output end, six commutation modules（101）The different phase line connected mode of correspondence, switches commutation module（101）Realize
The conversion of phase line.
2. a kind of general three-phase commutation switching main circuit according to claim 1, it is characterised in that：Commutation module（101）
The change of three-phase output end phase line connection form six kinds of different modes of connection and correspondingly six commutation modules（101）, commutation mould
Block（101）Switch（104）The change of phase line connection is realized in the change of break-make.
3. a kind of general three-phase commutation switching main circuit according to claim 1, it is characterised in that：When a commutation module
（101）When needing to connect, by the commutation module（101）Locking relay（105）Power-off, closing relay（106）It is powered real
Now switch（104）Closure；While remaining commutation module（101）Closing relay（106）Power-off, locking relay
（105）It is powered, realizes six commutation modules（101）Interlocking.
4. a kind of general three-phase commutation switching main circuit according to claim 1, it is characterised in that：Four enter four goes out commutation turn
Parallel operation（1）Branch point mains side, branch point load side, user's house lead in point installed in all three-phase and four-lines of low voltage electric network and/
Or three-phase and four-line switchs on the node of quarter-phase circuit.
5. a kind of general three-phase commutation is transferred the method for work of main circuit, it is characterised in that：
1）Receive order；
2）When the order for receiving is all off, by all closing relays（106）Full dead electricity, makes all switches（104）Entirely
Portion is to disengaged position；When the order for receiving is wheel inspection former closing position when commutation module S is opened；
3）Judge commutation module closing relay（106）It is whether powered；
4）Work as closing relay（106）When not having powered, judge whether the commutation module is the commutation module S that need to be opened；If not
The commutation module S that need to be opened, then return to step 3）, to next commutation module closing relay（106）Judged, until complete
Into the judgement of whole commutation modules；If the commutation module is the commutation module S that need to be opened, the locking of the commutation module is beaten
Open, by closing relay（106）It is powered, realization is closed a floodgate according to phase selection；
5）Work as closing relay（106）When powered, locking relay is judged（105）It is whether powered, if locking relay（105）Band
Electricity, then return to step 3）, to next commutation module closing relay（106）Judged, until completing whole commutation modules
Judgement；If locking relay（105）It is not charged, judge whether the commutation module is the commutation module S that need to be opened, when the commutation
When module is the commutation module S that need to be opened, alarm：Original state is consistent with command word, and this order is invalid；When the commutation module is not
During the commutation module S that need to be opened, then it is assumed that the commutation module is the commutation module of former closing position, the logical of the commutation module is recorded
Electricity condition, return to step 3）, to next commutation module closing relay（106）Judged, until completing whole commutation moulds
The judgement of block；
6）Closing relay to recording the commutation module of "on" position（106）Do power operation.
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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 true CN104660056B (en) | 2017-06-06 |
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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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| JPH06189457A (en) * | 1992-08-17 | 1994-07-08 | Kazuo Arai | Method for efficient use of contract power |
| 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 |
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004180363A (en) * | 2002-11-25 | 2004-06-24 | Tm T & D Kk | Reversed phase voltage compensation system for power grid system |
-
2015
- 2015-02-17 CN CN201510085416.2A patent/CN104660056B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06189457A (en) * | 1992-08-17 | 1994-07-08 | Kazuo Arai | Method for efficient use of contract power |
| 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 |
| JP2014202572A (en) * | 2013-04-04 | 2014-10-27 | 富士電機株式会社 | Power measurement device and power measurement system |
| 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 |
| 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 |
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