CN201918719U - Exciting-surge-inhibiting circuit for three-phase transformers - Google Patents
Exciting-surge-inhibiting circuit for three-phase transformers Download PDFInfo
- Publication number
- CN201918719U CN201918719U CN2011200138475U CN201120013847U CN201918719U CN 201918719 U CN201918719 U CN 201918719U CN 2011200138475 U CN2011200138475 U CN 2011200138475U CN 201120013847 U CN201120013847 U CN 201120013847U CN 201918719 U CN201918719 U CN 201918719U
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- circuit
- surge
- exciting
- phase
- inhibiting circuit
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Abstract
The utility model discloses an exciting-surge-inhibiting circuit for three-phase transformers, which belongs to the technical field of electric engineering technology. The exciting surge-inhibiting circuit comprises a three-phase rectifier bridge and a direct-current inducer, the three-phase rectifier bridge comprises six diodes, the direct-current inducer is connected with the direct-current side of the rectifier bridge, the whole exciting surge-inhibiting circuit is connected with the joint among three primary windings of a three-phase transformer, and the three primary windings are connected in the form of a star. The circuit adopts the method of the hardware circuit, the designed exciting surge-inhibiting circuit can effectively inhibit the exciting surge of medium-capacity and large-capacity three-phase transformers, moreover, the structure is simple, the cost is low, and the stability of a system can be enhanced.
Description
Technical field
The utility model relates to a kind of three-phase transformer inhibition circuit that shoves, and in can effectively suppressing, the magnetizing inrush current of jumbo three-phase transformer, belongs to the technical field of electrical engineering technology.
Background technology
The size and Orientation of the core material of transformer, magnetic structure, original remanent magnetism, idle-loaded switching-on initial phase angle and supply voltage amplitude, system equivalent internal impedance size etc. are all multifactor, all have influence on the magnetizing inrush current size of transformer.In actual applications, above-mentioned factor can not be eliminated, so magnetizing inrush current is prevalent in electric power system, and the frequency that magnetizing inrush current occurs is higher.The harmful effect of magnetizing inrush current mainly contains: 1) the big and magnetizing inrush current that contain a large amount of high order harmonic components of peak value causes the very big vibration of iron core, jeopardizes the mechanical strength of iron core associated components, and causes very big noise; Be easy to make the relaying protection tripping operation when 2) magnetizing inrush current is big, can cause the transformer internal overvoltage and disconnect so big shoving suddenly; 3) higher level or paired running transformer are flow through in shoving that the air-drop transformer produces, and make their protective relaying maloperation easily.
Summary of the invention
At the above-mentioned technical problem that exists in the prior art, the purpose of this utility model is to adopt the method for hardware circuit, provides a kind of three-phase transformer to suppress circuit, can suppress the magnetizing inrush current of transformer.
In order to realize the foregoing invention purpose, the technical solution of the utility model is:
A kind of three-phase transformer magnetizing inrush current suppresses circuit, comprises three-phase commutation bridge and the dc inductance be made up of six diodes, and dc inductance is connected the DC side of rectifier bridge; Described inhibition circuit is connected on the tie point place of Y-connected three the former limit windings of three-phase transformer.
During inhibition circuit of the present utility model can effectively suppress, the magnetizing inrush current of jumbo three-phase transformer, and simple in structure, cost is low, can improve the stability of system.
Description of drawings
Fig. 1 is the circuit diagram that the utility model three-phase transformer magnetizing inrush current suppresses circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further details.
As shown in Figure 1, wherein, Wa, Wb, Wc are three former limit windings of three-phase transformer because transformer secondary winding is not had specific (special) requirements, the Therefore, omited secondary circuit.Adopt six diode D1, D2, D3, D4, D5, D6 to form three-phase commutation bridge, DC side at rectifier bridge is provided with a dc inductance L1, thereby formed three-phase transformer magnetizing inrush current of the present utility model and suppressed circuit, and will suppress the Y-connection point place that circuit is connected on three former limit winding Wa of three-phase transformer, Wb, Wc.
Before transformer dropped into, electric current was zero among the dc inductance L1, after the transformer input, and the increase of must starting from scratch of the electric current in the inductance L 1, inductive current can not suddenly change, and makes the magnetizing inrush current of transformer be subjected to the inhibition of inductance L 1 like this.Because inductance L 1 is positioned at the DC side of rectification bridge circuit, under the effect of direct voltage, electric current continues to increase in the inductance L 1, reach the load current maximum after, enter steady-working state.Ignore the on-state voltage drop of diode D1-D6 and the loss of inductance L 1, the magnetizing inrush current that diode D1-D6 and inductance L 1 are formed suppresses the circuit two ends is not had pressure drop, and system is had no adverse effects.
Claims (1)
1. a three-phase transformer magnetizing inrush current suppresses circuit, comprises three-phase commutation bridge and the dc inductance (L1) be made up of six diodes (D1-D6), and it is characterized in that: dc inductance (L1) is connected the DC side of rectifier bridge; Described inhibition circuit is connected on the tie point place of Y-connected three the former limit windings of three-phase transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200138475U CN201918719U (en) | 2011-01-18 | 2011-01-18 | Exciting-surge-inhibiting circuit for three-phase transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200138475U CN201918719U (en) | 2011-01-18 | 2011-01-18 | Exciting-surge-inhibiting circuit for three-phase transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201918719U true CN201918719U (en) | 2011-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200138475U Expired - Fee Related CN201918719U (en) | 2011-01-18 | 2011-01-18 | Exciting-surge-inhibiting circuit for three-phase transformers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201918719U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779596A (en) * | 2015-04-20 | 2015-07-15 | 国家电网公司 | Direct-current reactor type magnetizing inrush current suppressor |
| CN109599837A (en) * | 2019-01-08 | 2019-04-09 | 同济大学 | A kind of voltage compensation type transformer excitation flow inhibition device |
-
2011
- 2011-01-18 CN CN2011200138475U patent/CN201918719U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779596A (en) * | 2015-04-20 | 2015-07-15 | 国家电网公司 | Direct-current reactor type magnetizing inrush current suppressor |
| CN109599837A (en) * | 2019-01-08 | 2019-04-09 | 同济大学 | A kind of voltage compensation type transformer excitation flow inhibition device |
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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: 20110803 Termination date: 20140118 |