The Crompton 810 Series provides a comprehensive range of Measuring and Protective duty ring current transformers for installation where traditional reliability, accuracy and quality are required.

Class X Current Transformers
In balanced earth fault protection systems, correct operation depends on the accuracy of the current transformers. Class 5P and 10P are suitable where the definite minimum times is greater than 0.2 seconds. For shorter operating time, transient conditions may require current transformers to have cross sectional areas many times greater than those of steady state faults.
The following information is required: (a) Turns ratio  ,  (b) Knee point voltage  ,  (c) Maximum excitation current  ,  (d) Secondary circuit resistance

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Performance

Designed to highest standards, 810 Series transformers have accuracy classes, outputs and performance to IEC 60044- :1999 for measuring and protective duties.

Overload withstand to:	BS3938 - IEC185
Operating voltage:	660V a.c. maximum
Test voltage:	2500V a.c.
System frequency:	50/60Hz or 400Hz
Service temperature:	-40°C to +70°C
Insulation class:	BS2757 class Y  (Maximum 90°C)

Construction

High grade silicon iron cores are carefully selected, then insulated and protected by a polypropylene or polycarbonate covering on which the secondary winding is toroidally wound by precision machines. The P.V.A. coated copper wire is additionally protected by a layer of half-lapped plasticised P.V.C tape. A second layer of self bonding P.V.C. tape is applied and vulcanised to provide a tough moisture-resistant coating.

A substantial terminal block with tag terminal and M6 screws and nuts is standard but M4 screws or insulated flex leads (normally 600mm) can be supplied. Integral fixing feet are normally provided but a busbar mount clamp or a plain ring may be specified.

Features

Plain ring, foot mounting or busbar fixings
Substantial tag terminals or flexible leads
Measuring Duty ranges up to 3000A
Protection Duty Classes 5P10 and 10P10
Special designs to customers requirements
ABS American Bureau of Shipping Approved