CN205051336U - Grounding transformer - Google Patents

Grounding transformer Download PDF

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Publication number
CN205051336U
CN205051336U CN201520715654.2U CN201520715654U CN205051336U CN 205051336 U CN205051336 U CN 205051336U CN 201520715654 U CN201520715654 U CN 201520715654U CN 205051336 U CN205051336 U CN 205051336U
Authority
CN
China
Prior art keywords
generator
iron core
secondary coil
utility
grounding transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201520715654.2U
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Chinese (zh)
Inventor
游智科
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guodian Dadu River Hydropower Development Co Ltd
Original Assignee
Guodian Dadu River Hydropower Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201520715654.2U priority Critical patent/CN205051336U/en
Application granted granted Critical
Publication of CN205051336U publication Critical patent/CN205051336U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a grounding transformer solves the very little problem of compensation perception electric current that present grounding transformer provided. The utility model discloses an iron core, one side winding has the main coil on the iron core, and the opposite side winding has the secondary coil, main coil one end is passed through the isolation switch and is linked to each other other end ground connection with the generator neutral point, be equipped with varistor ware R between two outputs of secondary coil, and one of them output ground connection, still be equipped with the inductance L parallelly connected with varistor ware R between two outputs of secondary coil. When the capacitance current of generator was great, earth current arrived the certain degree greatly, and ground point electric arc can not extinguish automatically, easily caused the generator stator iron core to damage. Use the utility model discloses a behind the grounding transformer, owing to be equipped with the inductance, the generator can produce inductive electric current when taking place single -phase ground connection, the capacitance current of compensation ground point and make that ground point electric arc is automatic to be extinguish to the effectual generator stator iron core of having avoided is damaged.

Description

A kind of grounding transformer
Technical field
The utility model belongs to and relates to a kind of grounding transformer.
Background technology
Generation current machine is all by high resistance grounding, can restricted grounding current, suitably can also reduce grounding surge.Principle is that grounding transformer is changed by amplifying by the secondary side small resistor of secondary, is presented on primary side high impedance, thus effectively limits Capacitive Flow.But when ground connection occurs generator, grounding transformer can only limit neutral point current, and the compensation inductance current provided is very little, easily causes generator failure.
Utility model content
The purpose of this utility model is to provide a kind of grounding transformer, solves the problem that compensation inductance current that current grounding transformer provides is very little.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of grounding transformer, comprise iron core, on described iron core, side is wound with main coil, and opposite side is wound with secondary coil; Described main coil one end is connected with generator neutral point by isolation switch, other end ground connection; Rheostat R is provided with between two outputs of described secondary coil, and one of them output head grounding; The inductance L in parallel with rheostat R is also provided with between two outputs of described secondary coil.
Further, described main coil and secondary coil are equipped with an induction coil.
The utility model compared with prior art, has the following advantages and beneficial effect:
When the capacitance current of generator is larger, greatly to a certain extent, earth point electric arc can not automatic distinguishing, easily causes electricity generator stator core to damage for earth current.After using grounding transformer of the present utility model, owing to being provided with inductance, can produce inductive electric current when generator generation single-phase earthing, the capacitance current of compensation of ground point and make earth point electric arc automatic distinguishing, thus it is damaged effectively to avoid electricity generator stator core.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, a kind of grounding transformer, comprises iron core, and on described iron core, side is wound with main coil, and opposite side is wound with secondary coil; Described main coil one end is connected with generator neutral point by isolation switch, other end ground connection; Rheostat R is provided with between two outputs of described secondary coil, and one of them output head grounding; The inductance L in parallel with rheostat R is also provided with between two outputs of described secondary coil.By arranging inductance L on secondary coil, can afford redress when ground connection occurs generator inductance current.
Particularly, described main coil and secondary coil are equipped with an induction coil.Current electric current can be responded to by induction coil, facilitate operated by personnel.
The utility model principle illustrates:
Generator is when normally running, and it is high resistance that grounding transformer secondary side (secondary coil) resistance converts primary side (main coil), makes generator neutral point by high resistance grounding, balancing generator outlet three-phase voltage;
During generator generation earth fault, grounding transformer secondary side inductance is converted primary side and is formed certain inductance compensation electric current, the capacity current that compensated dynamo neutrality flows through, and reduces the size of electric current thus protects primary equipment.
According to above-described embodiment, just the utility model can be realized well.What deserves to be explained is; under prerequisite based on said structure design; for solving same technical problem; even if some making on the utility model are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the utility model, therefore it also should in protection range of the present utility model.

Claims (2)

1. a grounding transformer, comprises iron core, it is characterized in that, on described iron core, side is wound with main coil, and opposite side is wound with secondary coil; Described main coil one end is connected with generator neutral point by isolation switch, other end ground connection; Rheostat R is provided with between two outputs of described secondary coil, and one of them output head grounding; The inductance L in parallel with rheostat R is also provided with between two outputs of described secondary coil.
2. a kind of grounding transformer according to claim 1, is characterized in that, described main coil and secondary coil are equipped with an induction coil.
CN201520715654.2U 2015-09-16 2015-09-16 Grounding transformer Active CN205051336U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520715654.2U CN205051336U (en) 2015-09-16 2015-09-16 Grounding transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520715654.2U CN205051336U (en) 2015-09-16 2015-09-16 Grounding transformer

Publications (1)

Publication Number Publication Date
CN205051336U true CN205051336U (en) 2016-02-24

Family

ID=55344880

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520715654.2U Active CN205051336U (en) 2015-09-16 2015-09-16 Grounding transformer

Country Status (1)

Country Link
CN (1) CN205051336U (en)

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: No.7 Tianyun Road, high tech Zone, Chengdu, Sichuan 610000

Patentee after: Guoneng Dadu River Basin Hydropower Development Co.,Ltd.

Address before: No.7 Tianyun Road, high tech Zone, Chengdu, Sichuan 610000

Patentee before: DADU RIVER HYDROPOWER DEVELOPMENT Co.,Ltd.

CP01 Change in the name or title of a patent holder