CN202930199U

CN202930199U - Current transformer

Info

Publication number: CN202930199U
Application number: CN 201220582325
Authority: CN
Inventors: 杨红斌; 赵凯凯; 付旭明; 刘红; 葛乃军; 王靖川
Original assignee: Jiangsu Sieyuan Hertz Instrument Transformer Co Ltd
Current assignee: Jiangsu Sieyuan Hertz Instrument Transformer Co Ltd
Priority date: 2012-11-07
Filing date: 2012-11-07
Publication date: 2013-05-08
Anticipated expiration: 2022-11-07

Abstract

The utility model relates to a current transformer for power industry. The current transformer comprises a primary conducting bar, a primary winding, a conductive tube, a secondary winding, a secondary conducting bar, an overvoltage protector, an insulation plate, a secondary wiring terminal and a primary wiring terminal, wherein a sleeve tube is arranged on a base; the secondary wiring terminal is arranged at the bottom of the base; the secondary winding is arranged in an inner cavity of a housing; the conducting tube penetrates through the secondary winding and is connected with the primary conducting bar; the primary winding is also arranged at the periphery of the secondary winding; and the coil taps of the primary winding are connected with the secondary conducting bar respectively. Multiple turns of the primary winding coils are wound on the secondary winding, so that current with small current ratio is increased and the current output range is expanded; the overvoltage protection device is configured, so that the devices of the current transformer can be protected; and the primary winding is uniformly wound on the secondary winding, so that the winding precision is higher.

Description

A kind of current transformer

Technical field

The utility model relates to a kind of instrument transformer that power industry is used, specifically a kind of current transformer.

Background technology

Through retrieving relevant patent documentation, not yet retrieve a kind of current transformer identical with the utility model structure at present.Existing current transformer is due to the reason of its structure, generally be only applicable to the occasion of large current ratio, continuous increase along with development and the digital circuit checkout equipment of science and technology, for large current ratio current transformer during for detection of equipment, need that also electric current is carried out the transformation processing and just can be used in testing circuit, bring very large inconvenience to use.China's patent application application number is: 201010573001.7, name is called: " a kind of multi-turn inverted current transformer " discloses a kind of multi-turn inverted current transformer, the current transformer of particularly little current ratio, although it is high that this application has overcome the current transformer cost of existing little current ratio, the shortcoming of the large and large current ratio current transformer of volume, but due to the reason of its structure at high voltage, easily cause the damage of current transformer under the inclement weather conditions such as thunderbolt, so the limitation that this type of instrument transformer uses is larger, still can not satisfy the existing actual needs of producing, low in order to satisfy cost, the requirement that curent change is large, so be necessary existing instrument transformer is improved, to satisfy actual needs.

Summary of the invention

The purpose of this utility model is that a kind of improvement on existing current transformer basis will be provided, and by realizing multiple current ratio in the peripheral form that is wound around a winding of existing secondary winding, is convenient to detect and a kind of current transformer of voltage protection.

Technical characterictic of the present utility model is: be designed to a kind of current transformer of being comprised of primary conductive row, winding, housing, contact tube, secondary winding, secondary busbar, overvoltage protection device, insulated terminal, insulation board, sleeve pipe, base, secondary wiring terminals, a primary connection terminal on the basis of considering compact conformation, dependable performance, sleeve pipe is arranged on base, bottom at base is provided with secondary wiring terminals, be provided with housing on sleeve pipe, be provided with secondary winding in the inner chamber of housing; Contact tube passes secondary winding and is connected with primary conductive row, also is provided with winding one time in the periphery of secondary winding, and primary conductive row be connected with a winding by lead-in wire; Each grade coil tap of a described winding is connected with the secondary busbar respectively, is provided with the primary connection terminal on primary conductive row, is provided with insulated terminal on the primary connection terminal, and insulated terminal separates the primary connection terminal with primary conductive row; Overvoltage protection device is connected with the primary connection terminal; Be provided with insulation board between housing and primary conductive row.

A described winding is that at least one circle winding coil uniform winding is on secondary winding.

A described winding is evenly distributed in the inner chamber of housing.

Described secondary busbar is a multiple-contact device, can be connected from the different number of turn coil contacts of a winding respectively according to electric pressure.

During use, primary conductive row is connected with contact tube, primary connection terminal respectively, the primary connection terminal is connected with a winding, the electric current of arranging by primary conductive enters into respectively contact tube, primary connection terminal, pass through electromagnetic induction, make and form induced current on secondary winding, and through secondary wiring terminals, current information is passed to detecting instrument, metering, control device; The induced current that forms around secondary winding through the electric current in a winding pass to again in the Digital Detecting device for detection of; The secondary busbar can according to the grade difference of required electric current, voltage respectively tap export.Primary side is provided with overvoltage protection, its objective is that destroying primary winding coils under the high pressure inclement weather conditions such as prevent from being struck by lightning arranges.

The utility model has the advantages that: owing to being wound with the multiturn primary winding coils on secondary winding, thereby increased the electric current of little current ratio, enlarged the scope of electric current output, changed the conventional current transformer current than large situation; Owing to being provided with overvoltage protection, thereby can play protection to the device of current transformer under the unbalanced state of voltage, particularly a winding is effectively protected; Due to a winding uniform winding on secondary winding, thereby make between winding the induction magnetic flux distribution even, reduce the leakage flux impact, make the winding precision higher; Owing to being provided with insulation board, thereby can effectively housing and primary conductive row be separated; Due to rational in infrastructure, superior performance is so there is very large practical and popularizing value.

Description of drawings

Below with reference to accompanying drawing, the utility model is described further:

Accompanying drawing 1 is the structural representation of a kind of current transformer of the utility model;

Accompanying drawing 2 is partial structurtes schematic diagrames of accompanying drawing 1;

Accompanying drawing 3 is that winding is wound in the structural representation on secondary winding.

Embodiment

With reference to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, it is comprised of a kind of current transformer of the present utility model primary conductive row 1, winding 2, housing 3, contact tube 4, secondary winding 5, secondary busbar 6, overvoltage protection device 7, insulated terminal 8, insulation board 9, sleeve pipe 10, base 11, secondary wiring terminals 12, a primary connection terminal 13, sleeve pipe 10 is arranged on base 11, be provided with secondary wiring terminals 12 in the bottom of base 11, be provided with housing 3 on sleeve pipe 10, be provided with secondary winding 5 in the inner chamber of housing 3; Contact tube 4 passes secondary winding 5 and is connected with primary conductive row 1, also be provided with winding 2 one time in the periphery of secondary winding 5, a described winding 2 is that at least one circle winding coil uniform winding is on secondary winding 5, a described winding 2 is evenly distributed in the inner chamber of housing 3, and primary conductive row 1 is connected with a winding 2 by lead-in wire; Each grade coil tap of a described winding 2 is connected with secondary busbar 6 respectively, described secondary busbar 6 is a multiple-contact device, can be connected from the different number of turn coil contacts of a winding 2 respectively according to electric pressure, be provided with primary connection terminal 13 on primary conductive row 1, be provided with insulated terminal 8 on primary connection terminal 13, insulated terminal 8 separates primary connection terminal 13 with primary conductive row 1; Overvoltage protection device 7 is connected with primary connection terminal 13; Be provided with insulation board 9 between housing 3 and primary conductive row 1.

Claims

a current transformer it by primary conductive row (1), a winding (2), housing (3), contact tube (4), secondary winding (5), secondary busbar (6), overvoltage protection device (7), insulated terminal (8), insulation board (9), sleeve pipe (10), base (11), secondary wiring terminals (12), primary connection terminal (13) forms, sleeve pipe (10) is arranged on base (11), be provided with secondary wiring terminals (12) in the bottom of base (11), be provided with housing (3) on sleeve pipe (10), be provided with secondary winding (5) in the inner chamber of housing (3), contact tube (4) passes secondary winding (5) and is connected with primary conductive row (1), and it is characterized in that: also be provided with a winding (2) in the periphery of secondary winding (5), primary conductive row (1) is connected with a winding (2) by lead-in wire, each grade coil tap of a described winding (2) is connected with secondary busbar (6) respectively, be provided with primary connection terminal (13) on primary conductive row (1), be provided with insulated terminal (8) on primary connection terminal (13), insulated terminal (8) separates primary connection terminal (13) with primary conductive row (1), overvoltage protection device (7) is connected with primary connection terminal (13), be provided with insulation board (9) between housing (3) and primary conductive row (1).
2. a kind of current transformer according to claim 1 is characterized in that: a described winding (2) at least one circle winding coil uniform winding on secondary winding (5).
3. a kind of current transformer according to claim 1 and 2, it is characterized in that: a described winding (2) is evenly distributed in the inner chamber of housing (3).
4. a kind of current transformer according to claim 1, it is characterized in that: described secondary busbar (6) is a multiple-contact device, can be connected from the different number of turn coil contacts of a winding (2) respectively according to electric pressure.