CN204407167U - A kind of loaded capacity-regulated transformer - Google Patents
A kind of loaded capacity-regulated transformer Download PDFInfo
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- CN204407167U CN204407167U CN201520098862.2U CN201520098862U CN204407167U CN 204407167 U CN204407167 U CN 204407167U CN 201520098862 U CN201520098862 U CN 201520098862U CN 204407167 U CN204407167 U CN 204407167U
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Abstract
The utility model discloses a kind of loaded capacity-regulated transformer in power transmission and distribution field, comprise transformer body, three-phase high-voltage winding and three-phase low-voltage winding; Transformer body is provided with three bushings and three low-tension bushings, the phase high pressure winding in three-phase high-voltage winding is respectively equipped with in three bushings, be respectively equipped with the phase low pressure winding in three-phase low-voltage winding in three low-tension bushings, every phase low pressure winding is all made up of winding L 1, winding L 2 and winding L 3; Loaded capacity-regulated transformer is also provided with loaded capacity-regulated switch; For loaded capacity-regulated transformer is switched between low appearance state and high appearance state; When loaded capacity-regulated transformer is in high appearance state, each phase high pressure winding on three-phase high-voltage winding connects into triangle, in every phase low pressure winding of three-phase low-voltage winding, winding L 1 and the first parallel connection of winding L 2 are connected with winding L 3 again, when loaded capacity-regulated transformer is in low appearance state, each phase high pressure winding on three-phase high-voltage winding connects into star, and in every phase low pressure winding of three-phase low-voltage winding, winding L 1, winding L 2 and winding L 3 are connected successively.
Description
Technical field
The utility model relates to a kind of loaded capacity-regulated transformer in power transmission and distribution field.
Background technology
Transformer is a kind of important equipment for power transmission and distribution, and it plays irreplaceable important function at electric line.The very strong lack of uniformity that load on electric line exists in time.If the capacity of transformer all by the design of maximum power load, will cause very large no-load loss and resistance loss when low power consumption, seriously runs counter to the state basic policy of energy-saving and emission-reduction.If the capacity of transformer designs according to normal power load, serious safety utilization of electric power hidden danger will be produced when peak of power consumption.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of loaded capacity-regulated transformer, and its capacity can hold between state and low appearance state at height and switches flexibly, thus has taken into account energy-saving and emission-reduction and Electrical Safety.
A kind of technical scheme realizing above-mentioned purpose is: a kind of loaded capacity-regulated transformer, comprises transformer body, three-phase high-voltage winding and three-phase low-voltage winding;
Described transformer body is provided with three bushings and three low-tension bushings, the phase high pressure winding in three-phase high-voltage winding is respectively equipped with in described three bushings, be respectively equipped with the phase low pressure winding in three-phase low-voltage winding in described three low-tension bushings, often mutually described low pressure winding is all made up of winding L 1, winding L 2 and winding L 3;
Described loaded capacity-regulated transformer is also provided with loaded capacity-regulated switch; Described loaded capacity-regulated transformer is switched between low appearance state and high appearance state;
When described loaded capacity-regulated transformer is in high appearance state, each phase high pressure winding on described three-phase high-voltage winding connects into triangle, and in every phase low pressure winding of described three-phase low-voltage winding, described winding L 1 and the first parallel connection of described winding L 2 are connected with described winding L 3 again,
When described loaded capacity-regulated transformer is in low appearance state, each phase high pressure winding on described three-phase high-voltage winding connects into star, and in every phase low pressure winding of described three-phase low-voltage winding, described winding L 1, described winding L 2 and described winding L 3 are connected successively.
Further, every phase high pressure winding of described three-phase high-voltage winding, its first end connects 10kV bus, and its second end is provided with K switch 1 and K switch 2, and described K switch 1 connects 10kV bus, and described K switch 2 connects the common junction of described three-phase high-voltage winding;
In every phase low pressure winding of described three-phase low-voltage winding, the first end of described winding L 1 connects the common junction of described three-phase low-voltage winding, the first end of described winding L 2 is provided with K switch 3, described K switch 3 connects the common junction of described three-phase low-voltage winding, K switch 4 is connected with between the second end of described winding L 1 and the first end of described winding L 2, the second end of described winding L 2 connects the first end of described winding L 3, K switch 5 is provided with between the first end of described winding L 3 and the second end of described winding L 1, the second end of described winding L 3 connects 0.4kV power line,
Described loaded capacity-regulated switch is made up of above-mentioned three K switch 1, three K switch 2, three K switch 3, three K switch 4 and three K switch 5.
Further, in every phase low pressure winding of described three-phase low-voltage winding, the second end of described coil L3 is all provided with current measuring transformer.
Further, described loaded capacity-regulated transformer also establishes loaded capacity-regulated controller, described loaded capacity-regulated controller comprises electric energy computation chip, first comparator, second comparator and OR circuit, described electric energy computation chip connects described three-phase low-voltage winding, the input port of described first comparator is connected described electric energy computation chip with the input port of described second comparator, the output port of described first comparator is connected first input end mouth and second input port of described OR circuit with the output port correspondence of described second comparator, the output port of described OR circuit connects described loaded capacity-regulated switch.Also want further, described loaded capacity-regulated controller is also provided with the first delay circuit between described first comparator and the first input end mouth of described OR circuit, and the second delay circuit between described second comparator and the second input port of described OR circuit.
Also want further, be provided with relay between described first comparator and described second comparator, described relay is provided with counter and timer.
Have employed the technical scheme of a kind of loaded capacity-regulated transformer of the present utility model, namely comprise transformer body, three-phase high-voltage winding and three-phase low-voltage winding; Transformer body is provided with three bushings and three low-tension bushings, the phase high pressure winding in three-phase high-voltage winding is respectively equipped with in three bushings, be respectively equipped with the phase low pressure winding in three-phase low-voltage winding in three low-tension bushings, every phase low pressure winding is all made up of winding L 1, winding L 2 and winding L 3; Loaded capacity-regulated transformer is also provided with loaded capacity-regulated switch; For loaded capacity-regulated transformer is switched between low appearance state and high appearance state; When loaded capacity-regulated transformer is in high appearance state, each phase high pressure winding on three-phase high-voltage winding connects into triangle, in every phase low pressure winding of three-phase low-voltage winding, winding L 1 and the first parallel connection of winding L 2 are connected with winding L 3 again, when loaded capacity-regulated transformer is in low appearance state, each phase high pressure winding on three-phase high-voltage winding connects into star, and in every phase low pressure winding of three-phase low-voltage winding, winding L 1, winding L 2 and winding L 3 are connected successively.Its technique effect is: its capacity can hold between state and low appearance state at height and switches flexibly, thus has taken into account energy-saving and emission-reduction and Electrical Safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of loaded capacity-regulated transformer of the present utility model.
Fig. 2 a is three-phase high-voltage winding and three-phase low-voltage winding connection diagram under high appearance state of a kind of loaded capacity-regulated transformer of the present utility model.
Fig. 2 b is three-phase high-voltage winding and three-phase low-voltage winding connection diagram under low appearance state of a kind of loaded capacity-regulated transformer of the present utility model.
Fig. 3 is the schematic diagram of the loaded capacity-regulated switch of a kind of loaded capacity-regulated transformer of the present utility model.
Fig. 4 is the schematic diagram of the loaded capacity-regulated controller of a kind of loaded capacity-regulated transformer of the present utility model.
Embodiment
Refer to Fig. 1 to Fig. 4, inventor of the present utility model, in order to understand the technical solution of the utility model better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
A kind of loaded capacity-regulated transformer of the present utility model, comprises transformer body 1, loaded capacity-regulated switch 2, loaded capacity-regulated controller 3.Transformer body 1 is provided with three bushings 11 and three low-tension bushings 12, wherein in three bushings 11, correspondence is provided with the phase high pressure winding in three-phase high-voltage winding 4, and with the iron core of this phase high pressure winding, in three low-tension bushings 12, correspondence is provided with the phase low pressure winding in three-phase low-voltage winding 5, and with the iron core of this phase low pressure winding.Loaded capacity-regulated switch 2 is for realizing three-phase high-voltage winding 4 and the two-way switching of three-phase low-voltage winding 5 between high appearance state and low appearance state, loaded capacity-regulated controller 3 is for the electric current by measuring loaded capacity-regulated transformer secondary side and voltage, control the two-way switching of loaded capacity-regulated switch 2, and confirm the position of loaded capacity-regulated switch 2.
A kind of loaded capacity-regulated transformer of the present utility model effectively can reduce no-load loss when it runs.When its load is less, by increasing each phase high pressure winding in its three-phase high-voltage winding 4, the number of turn of each phase low pressure winding in three-phase low-voltage winding 5, reduce the iron core of each phase high pressure winding in its three-phase high-voltage winding 4, in three-phase low-voltage winding 5 each phase low pressure winding iron core in magnetic flux density, thus reduce its no-load loss.
The concrete mode that loaded capacity-regulated transformer realizes is: each phase high pressure winding in three-phase high-voltage winding 4 is connected into triangle when loaded capacity-regulated transformer is in high appearance state, star is connected into during low capacity, as shown in Figure 2 a when loaded capacity-regulated transformer is in low appearance state.Every phase low pressure winding of three-phase low-voltage winding 5 is made up of three parts: i.e. winding L 1, winding L 2 and winding L 3, and winding L 2 and winding L 3 are coiled into respectively, and total umber of turn of winding L 2 and winding L 3 is greater than the umber of turn of the high pressure winding of corresponding phase in three-phase high-voltage winding 4, connect with winding L 1 again after winding L 2 and winding L 3 parallel connection when loaded capacity-regulated transformer is in high appearance state.When loaded capacity-regulated transformer is in low appearance state, winding L 1, winding L 2 and winding L 3 are connected successively.Loaded capacity-regulated transformer is in high appearance state when being transferred to low appearance state, and in three-phase low-voltage winding 5, the umber of turn of every phase low pressure winding increases.In three-phase high-voltage winding 4, each phase high pressure winding forms Y-connection simultaneously, and phase voltage reduces, and the multiple that the number of turn increases and voltage reduces is suitable, can ensure that output voltage is constant.The ratio of capacity when loaded capacity-regulated transformer high appearance state and low appearance state is 3:1.As shown in Figure 2 b.
Every phase high pressure winding of three-phase high-voltage winding 4, its first end connects 10kV bus, and its second end is provided with K switch 1 and K switch 2, and wherein K switch 1 connects 10kV bus, and K switch 2 connects the common junction of three-phase high-voltage winding 4.
Every phase low pressure winding of three-phase low-voltage winding 5, all be provided with winding L 1, winding L 2 and winding L 3, wherein, the first end of winding L 1 connects the common junction of three-phase low-voltage winding 5, the first end of winding L 2 is provided with K switch 3, K switch 3 connects the common junction of three-phase low-voltage winding 5, simultaneously, K switch 4 is connected with between the second end of winding L 1 and the first end of winding L 2, the second end of winding L 2 connects the first end of winding L 3, is provided with K switch 5 between the first end of winding L 3 and the second end of winding L 1.The second end of winding L 3 connects 0.4kV power line.In three-phase low-voltage winding 5, the second end of the winding L 3 of each phase low pressure winding is formed with the secondary side of load capacitance-adjustable transformer.Meanwhile, in three-phase low-voltage winding 5, the second end of the winding L 3 of each phase low pressure winding is all provided with a current measuring transformer CT.
Loaded capacity-regulated switch 2 is made up of above-mentioned three K switch 1, three K switch 2, three K switch 3, three K switch 4 and three K switch 5.When loaded capacity-regulated transformer operates in high appearance state, K switch 1, K switch 3 and K switch 5 all close, K switch 2 and K switch 4 all disconnect, in three-phase high-voltage winding 4, the connection triangle of each phase high pressure winding connects, in every phase low pressure winding of three-phase low-voltage winding 5, connect with winding L 3 again after winding L 1 and winding L 2 parallel connection; When loaded capacity-regulated transformer operates in low appearance state, K switch 2 and K switch 4 all close, K switch 1, K switch 3 and K switch 5 all disconnect, in three-phase high-voltage winding 4, the connection of each phase high pressure winding is Y-connection, in every phase low pressure winding of three-phase low-voltage winding 5, winding L 1, winding L 2 and winding L 3 are connected.
Loaded capacity-regulated controller 3 comprises an electric energy computation chip 31, the input port of electric energy computation chip 31 connects the second end of the winding L 3 of every phase low pressure winding in three-phase low-voltage winding 5, and be arranged in the current measuring transformer CT of the second end of winding L 3 of the every phase low pressure winding of three-phase low-voltage winding 5, for measuring the electric current that the winding L 3 of every phase low pressure winding in three-phase low-voltage winding 5 flows through.The output port of electric energy computation chip 31 connects the input port of the first comparator 32 and the input port of the second comparator 33.The output port of the first comparator 32 connects the input port of the first delay circuit 34, and the output port of the second comparator 33 connects the input port of the second delay circuit 35.
When the current maxima that first comparator 32 detects in the winding L 3 of any phase low pressure winding in three-phase low-voltage winding 5 is greater than 80% of rated current under the low appearance state of this loaded capacity-regulated transformer, after one minute, the signal of a high level is sent by the first delay circuit 34 time delay.
When second comparator 33 detects that the current maxima in the winding L 3 of any phase low pressure winding in three-phase low-voltage winding 5 is less than 60% of rated current under this loaded capacity-regulated transformer high appearance state, after 15 minutes, the signal of a high level is sent by the second delay circuit 35 time delay.
First output port of the first delay circuit 34 connects the first input end mouth of OR circuit 36, the output port of the second delay circuit 35 connects the second input port of OR circuit 36, the output port of OR circuit 36 is connected with and carries capacitance switch 2, the output port of OR circuit 36 often exports a high level signal, and loaded capacity-regulated switch 2 switches once between the two states.
Simultaneously, relay 37 is provided with between first comparator 32 and the second comparator 33, relay 37 is provided with counter 371 and timer 372, first comparator 32 or the second comparator 33 often send a high level signal, relay 37 switches once, first comparator 32 or the second comparator 33 are taken turns to operate, and unison counter 371 counting adds one.Counter 371 counts full five times, and relay 37 cuts off the power supply of the first comparator 32 and the second comparator 33 automatically.The full twenty four hours of timer 372 timing, sends a pulse signal from trend counter 371, counter 371 is reset.Relay 371 recovers the operating state before power-off, and namely before power-off, relay 37 makes the first comparator 32 work, and after energising, or the first comparator 32 works, and vice versa, and therefore loaded capacity-regulated controller 3 has the function confirming loaded capacity-regulated switch 2 position.
The relation of transformer working voltage and no-load loss is specific as follows:
In formula: w is umber of turn; U
Φfor phase voltage; E
zfor every circle electromotive force.
When the Transformer Winding number of turn is certain, every circle electromotive force E
zwith phase voltage U
Φproportional.And
In formula: A
cfor iron core net sectional area; B
cfor iron core magnetic flux density;
As transformer core effective cross-section A
cone timing, iron core magnetic flux density B
cwith every circle electromotive force E
zbe inversely proportional to.And the no-load loss P of transformer
0calculating formula is:
P
0＝K
P0×P
C×G
Fe
In formula: P
0for no-load loss; K
p0for no-load loss technological coefficient; P
cfor iron core specific loss; G
fefor the total weight of iron core.
No-load loss technological coefficient K
p0with the total weight G of iron core
feconstant, and iron core specific loss P
cwith iron core magnetic flux density B
csquare to be directly proportional, when high appearance state is adjusted to low appearance state, because the umber of turn of phase low pressure winding every in three-phase low-voltage winding 5 increases, iron core magnetic flux density B
creduce, make iron core specific loss P
cdiminish, no-load loss and no-load current reduce, and reach the object of wastage reducing and energy saving.
Due to phase low pressure winding every in three-phase low-voltage winding 5 described when loaded capacity-regulated transformer designs, and the cross section of the wire of every phase low pressure winding is chosen by high appearance state in described three-phase low-voltage winding 5, after being adjusted to low appearance state, because electric current reduces, the current density of wire diminishes.The resistance loss of loaded capacity-regulated transformer reduces greatly.Like this, loading capacitance-regulating distribution transformer just have effectively achieved wastage reducing and energy saving.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the utility model is described, and be not used as restriction of the present utility model, as long as in spirit of the present utility model, all will drop in Claims scope of the present utility model the change of the above embodiment, modification.
Claims (6)
1. a loaded capacity-regulated transformer, comprises transformer body, three-phase high-voltage winding and three-phase low-voltage winding; It is characterized in that:
Described transformer body is provided with three bushings and three low-tension bushings, the phase high pressure winding in three-phase high-voltage winding is respectively equipped with in described three bushings, be respectively equipped with the phase low pressure winding in three-phase low-voltage winding in described three low-tension bushings, often mutually described low pressure winding is all made up of winding L 1, winding L 2 and winding L 3;
Described loaded capacity-regulated transformer is also provided with loaded capacity-regulated switch; Described loaded capacity-regulated transformer is switched between low appearance state and high appearance state;
When described loaded capacity-regulated transformer is in high appearance state, each phase high pressure winding on described three-phase high-voltage winding connects into triangle, and in every phase low pressure winding of described three-phase low-voltage winding, described winding L 1 and the first parallel connection of described winding L 2 are connected with described winding L 3 again;
When described loaded capacity-regulated transformer is in low appearance state, each phase high pressure winding on described three-phase high-voltage winding connects into star, and in every phase low pressure winding of described three-phase low-voltage winding, described winding L 1, described winding L 2 and described winding L 3 are connected successively.
2. a kind of loaded capacity-regulated transformer according to claim 1, it is characterized in that: every phase high pressure winding of described three-phase high-voltage winding, its first end connects 10kV bus, its the second end is provided with K switch 1 and K switch 2, described K switch 1 connects 10kV bus, and described K switch 2 connects the common junction of described three-phase high-voltage winding;
In every phase low pressure winding of described three-phase low-voltage winding, the first end of described winding L 1 connects the common junction of described three-phase low-voltage winding, the first end of described winding L 2 is provided with K switch 3, described K switch 3 connects the common junction of described three-phase low-voltage winding, K switch 4 is connected with between the second end of described winding L 1 and the first end of described winding L 2, the second end of described winding L 2 connects the first end of described winding L 3, K switch 5 is provided with between the first end of described winding L 3 and the second end of described winding L 1, the second end of described winding L 3 connects 0.4kV power line,
Described loaded capacity-regulated switch is made up of above-mentioned three K switch 1, three K switch 2, three K switch 3, three K switch 4 and three K switch 5.
3. a kind of loaded capacity-regulated transformer according to claim 2, is characterized in that: in every phase low pressure winding of described three-phase low-voltage winding, the second end of described coil L3 is all provided with current measuring transformer.
4. a kind of loaded capacity-regulated transformer according to claim 3, it is characterized in that: it also establishes loaded capacity-regulated controller, described loaded capacity-regulated controller comprises electric energy computation chip, first comparator, second comparator and OR circuit, described electric energy computation chip connects described three-phase low-voltage winding, the input port of described first comparator is connected described electric energy computation chip with the input port of described second comparator, the output port of described first comparator is connected first input end mouth and second input port of described OR circuit with the output port correspondence of described second comparator, the output port of described OR circuit connects described loaded capacity-regulated switch.
5. a kind of loaded capacity-regulated transformer according to claim 4, it is characterized in that: described loaded capacity-regulated controller is also provided with the first delay circuit between described first comparator and the first input end mouth of described OR circuit, and the second delay circuit between described second comparator and the second input port of described OR circuit.
6. a kind of loaded capacity-regulated transformer according to claim 4, is characterized in that: be provided with relay between described first comparator and described second comparator, described relay is provided with counter and timer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520098862.2U CN204407167U (en) | 2015-02-11 | 2015-02-11 | A kind of loaded capacity-regulated transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520098862.2U CN204407167U (en) | 2015-02-11 | 2015-02-11 | A kind of loaded capacity-regulated transformer |
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| CN204407167U true CN204407167U (en) | 2015-06-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616872A (en) * | 2015-02-11 | 2015-05-13 | 国网上海市电力公司 | On-load capacitance adjustment transformer |
| CN106158310A (en) * | 2016-08-31 | 2016-11-23 | 浙江恒朗电气有限公司 | A kind of loaded capacity-regulated transformer saving the energy |
| CN106710846A (en) * | 2016-11-17 | 2017-05-24 | 国网新疆电力公司和田供电公司 | On-load capacity regulating transformer which has good energy-saving effect and achieves remote monitoring |
-
2015
- 2015-02-11 CN CN201520098862.2U patent/CN204407167U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616872A (en) * | 2015-02-11 | 2015-05-13 | 国网上海市电力公司 | On-load capacitance adjustment transformer |
| CN106158310A (en) * | 2016-08-31 | 2016-11-23 | 浙江恒朗电气有限公司 | A kind of loaded capacity-regulated transformer saving the energy |
| CN106710846A (en) * | 2016-11-17 | 2017-05-24 | 国网新疆电力公司和田供电公司 | On-load capacity regulating transformer which has good energy-saving effect and achieves remote monitoring |
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