Abstract

A current transformer is described which comprises a housing having one or more apertures, each for receiving a primary cable or busbar, one or more magnetic cores enclosed within the housing and being positioned proximate to respective ones of the apertures so that a magnetic field is produced in a magnetic core when a primary current flows through a primary cable or busbar received through the respective aperture, and one or more secondary windings enclosed within the housing, each secondary winding being wrapped around at least a portion of a respective magnetic core so that a secondary current is induced in a secondary winding when a magnetic field is produced in the respective magnetic core. Shunt circuitry is enclosed within the housing and is connected across the secondary windings to generate a respective voltage signal for each secondary winding. A connector socket is integrally mounted to the housing for outputting the voltage signals. In this way, the labor costs incurred during installation of the current transformer can be reduced, a risk of wiring errors can be avoided, and a risk of electrocution from secondary terminals being left open-circuit is removed.

IPC Classes  ?

• G01R 19/18 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
• H01F 27/40 - Structural association with built-in electric component, e.g. fuse
• G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
• H01F 38/30 - Constructions
• H01F 38/32 - Circuit arrangements
• H01F 38/38 - Instrument transformers for polyphase AC
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
• G01R 1/00 - Details of instruments or arrangements of the types covered by groups or
• H02M 1/00 - Details of apparatus for conversion
• G01M 1/00 - Testing static or dynamic balance of machines or structures

Abstract

A current transformer is described which comprises a housing having one or more apertures, each for receiving a primary cable or busbar, one or more magnetic cores enclosed within the housing and being positioned proximate to respective ones of the apertures so that a magnetic field is produced in a magnetic core when a primary current flows through a primary cable or busbar received through the respective aperture, and one or more secondary windings enclosed within the housing, each secondary winding being wrapped around at least a portion of a respective magnetic core so that a secondary current is induced in a secondary winding when a magnetic field is produced in the respective magnetic core. Shunt circuitry is enclosed within the housing and is connected across the secondary windings to generate a respective voltage signal for each secondary winding. A connector socket is integrally mounted to the housing for outputting the voltage signals. In this way, the labour costs incurred during installation of the current transformer can be reduced, a risk of wiring errors can be avoided, and a risk of electrocution from secondary terminals being left open-circuit is removed.

IPC Classes  ?

• G01R 19/15 - Indicating the presence of current
• H01F 38/30 - Constructions
• H01F 38/32 - Circuit arrangements
• H01F 38/38 - Instrument transformers for polyphase AC

Goods & Services

(1) Security and access control equipment namely, locks and accessories, burglar alarm panels, alarms, close circuit TV systems, computer aided scanning and detection equipment.

Goods & Services

(1) Security and access control equipment namely, locks and accessories, burglar alarm panels, alarms, CCTV systems, computer aided scanning and detection equipment.