CN202094605U - Pre-excitation device for power transformer - Google Patents
Pre-excitation device for power transformer Download PDFInfo
- Publication number
- CN202094605U CN202094605U CN2011202056003U CN201120205600U CN202094605U CN 202094605 U CN202094605 U CN 202094605U CN 2011202056003 U CN2011202056003 U CN 2011202056003U CN 201120205600 U CN201120205600 U CN 201120205600U CN 202094605 U CN202094605 U CN 202094605U
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- transformer
- power transformer
- contactor
- kilovolt
- excitation
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Abstract
The utility model relates to a pre-excitation device for a power transformer characterized in that: one side of the power transformer is provided with a switch which is connected with a high voltage line, the switch is connected with a transformer, the transformer is connected with a first contactor, the first contactor is connected with a reactor, the reactor is connected with a resistor, the resistor is connected with a second contactor, the second contactor is connected with a low voltage line, a capacity of the power transformer is 800 kilovolt to 10000 kilovolt, a capacity of the transformer is 40 kilovolt, an excitation is performed to a secondary side of the power transformer by a small-capacity transformer, at the same time, a high voltage is inducted at a primary side of the power transformer, then after a few seconds, the power transformer has a stable excitation, thus no excitation inrush current will generate when the power transformer is put into operation again. The pre-excitation device of the utility model has simple structure and convenient operation, solves the problem of excitation inrush current, realizes frequent switching of the transformer, and can be put into operation at any time, thereby reducing no-load loss of the power transformer, and saving large amounts of energy.
Description
Technical field
The utility model relates to a kind of electric equipment, is specifically related to a kind of power transformer pre-excitation device that can play energy-conserving action and reduce transformer noload losses.
Background technology
Power transformer be by electromagnetic induction with the alternating voltage of a system and current conversion power equipment for the voltage and current of another system, power transformer is made up of unshakable in one's determination and cover two or more windings thereon.Harbour container bridge crane crane, all is furnished with 1 of main transformer on every crane, capacity does not wait from 1000 kilovolt-amperes to 2000 kilovolt-amperes, usually the service entrance switch of main transformer is in closing position always, even when not operation of crane, no-load loss is arranged on the main transformer always, coupled cable, element etc. are also lossy, this part energy consumption has not only reduced the power factor of complete machine, has increased the complete machine operation cost.If during the work of harbour container bridge crane crane, main transformer send electricity, when harbour container bridge crane crane quit work, main transformer had a power failure, and can save a large amount of energy consumptions.When Transformer Close, may produce very big electric current, when the circuit breaker that closes charges to transformer, sometimes can see that the pointer of transformer current table puts very greatly, turn back to normal no-load current value then very soon, this impulse current is referred to as magnetizing inrush current usually, when sending electricity, power transformer can produce magnetizing inrush current, power transformer is produced huge impact, cause power transformer to damage easily, therefore power transformer can not frequent starting, power transformer pre-excitation device solves power transformer can not frequent starting problem.
Summary of the invention
At the deficiencies in the prior art, the purpose of this utility model is to provide a kind of power transformer that solves can not frequent starting and the power transformer pre-excitation device of the no longer long-term Issues on Static Electrification of power transformer of many interruptedly supplying powers, the utility model is realized with using with throwing, both save power transformer no-load loss, saved a large amount of energy again.
The technical solution of the utility model is achieved in that a kind of power transformer pre-excitation device, comprise the high-voltage switch gear that is connected with high-tension line, the power transformer that is connected with high-voltage switch gear, the low-voltage circuit that is connected with power transformer, one side of described power transformer is provided with the switch that is connected with high-tension line, switch is connected with transformer, transformer is connected with first contactor, first contactor is connected with reactor, reactor is connected with resistor, resistor is connected with second contactor, and second contactor is connected with low-voltage circuit.
The capacity of described power transformer is 800 kilovolt-amperes to 10000 kilovolt-amperes.
The capacity of described transformer is 40 kilovolt-amperes.
The utlity model has following good effect: this product is provided with the switch that is connected with high-tension line in a side of power transformer, switch is connected with transformer, transformer is connected with first contactor, first contactor is connected with reactor, reactor is connected with resistor, resistor is connected with second contactor, second contactor is connected with low-voltage circuit, the capacity of power transformer is 800 kilovolt-amperes to 10000 kilovolt-amperes, the capacity of transformer is 40 kilovolt-amperes, give the secondary excitation of power transformer with the transformer of a low capacity, simultaneously induce high pressure on the former limit of power transformer, after several seconds, the power transformer excitation is stable, and power transformer puts into operation and can not produce magnetizing inrush current; This product structure is simple, and is easy to operate, solved the magnetizing inrush current problem, realized the frequent switching of transformer, with using with throwing, reduced power transformer no-load loss, saved a large amount of energy.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
As shown in Figure 1, the utility model provides a kind of power transformer pre-excitation device, this power transformer pre-excitation device comprises the high-voltage switch gear 1 that is connected with high-tension line, the power transformer 2 that is connected with high-voltage switch gear 1, the low-voltage circuit that is connected with power transformer 2, side at power transformer 2 is provided with the switch 8 that is connected with high-tension line, switch 8 is connected with transformer 7, transformer 7 is connected with first contactor 6, first contactor 6 is connected with reactor 5, reactor 5 is connected with resistor 4, resistor 4 is connected with second contactor 3, and second contactor 3 is connected with low-voltage circuit.The capacity of power transformer 2 is 800 kilovolt-amperes to 10000 kilovolt-amperes.The capacity of described transformer 7 is 40 kilovolt-amperes.
Control procedure: switch 8, transformer 7 work online always, connect first contactor 6, reactor 5, resistor 4 and second contactor 3 when moving this product earlier, connect the low-pressure side of power transformer 2 then, carry out pre-excitation, after several seconds, after power transformer 2 is set up stabilizing magnetic field, connect the high-voltage switch gear 1 of power transformer 2 this moment, and power transformer 2 enters normal operating conditions, and contactor 6,3 disconnects simultaneously, power transformer 2 starts, and the pre-excitation process is finished; When crane is idle, disconnect power transformer 2, can save transformer noload losses, line loss.
This product is provided with the switch that is connected with high-tension line in a side of power transformer, switch is connected with transformer, transformer is connected with first contactor, first contactor is connected with reactor, reactor is connected with resistor, resistor is connected with second contactor, and second contactor is connected with low-voltage circuit, and the capacity of power transformer is 800 kilovolt-amperes to 10000 kilovolt-amperes.The capacity of transformer is 40 kilovolt-amperes.Secondary excitation with the transformer of a low capacity is given power transformer induces high pressure on the former limit of power transformer simultaneously, and after several seconds, the power transformer excitation is stable, and power transformer puts into operation and can not produce magnetizing inrush current; This product structure is simple, and is easy to operate, solved the magnetizing inrush current problem, realized the frequent switching of transformer, with using with throwing, reduced power transformer no-load loss, saved a large amount of energy.
Claims (3)
1. power transformer pre-excitation device, comprise the high-voltage switch gear (1) that is connected with high-tension line, the power transformer (2) that is connected with high-voltage switch gear (1), the low-voltage circuit that is connected with power transformer (2), it is characterized in that: a side of described power transformer (2) is provided with the switch (8) that is connected with high-tension line, switch (8) is connected with transformer (7), transformer (7) is connected with first contactor (6), first contactor (6) is connected with reactor (5), reactor (5) is connected with resistor (4), resistor (4) is connected with second contactor (3), and second contactor (3) is connected with low-voltage circuit.
2. power transformer pre-excitation device according to claim 1 is characterized in that: the capacity of described power transformer (2) is 800 kilovolt-amperes to 10000 kilovolt-amperes.
3. power transformer pre-excitation device according to claim 1 is characterized in that: the capacity of described transformer (7) is 40 kilovolt-amperes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202056003U CN202094605U (en) | 2011-06-17 | 2011-06-17 | Pre-excitation device for power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202056003U CN202094605U (en) | 2011-06-17 | 2011-06-17 | Pre-excitation device for power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202094605U true CN202094605U (en) | 2011-12-28 |
Family
ID=45369648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202056003U Expired - Fee Related CN202094605U (en) | 2011-06-17 | 2011-06-17 | Pre-excitation device for power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202094605U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683192A (en) * | 2013-11-06 | 2014-03-26 | 天津瑞能电气有限公司 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
| WO2015101327A1 (en) * | 2014-01-03 | 2015-07-09 | 国家电网公司 | Method for calculating minimum switching time of closing resistor of high-capacity main transformer |
| CN112865180A (en) * | 2021-02-23 | 2021-05-28 | 海南金盘智能科技股份有限公司 | Flexible grid-connected auxiliary device for power transformer |
-
2011
- 2011-06-17 CN CN2011202056003U patent/CN202094605U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683192A (en) * | 2013-11-06 | 2014-03-26 | 天津瑞能电气有限公司 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
| WO2015101327A1 (en) * | 2014-01-03 | 2015-07-09 | 国家电网公司 | Method for calculating minimum switching time of closing resistor of high-capacity main transformer |
| CN112865180A (en) * | 2021-02-23 | 2021-05-28 | 海南金盘智能科技股份有限公司 | Flexible grid-connected auxiliary device for power transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20120617 |