Current Transformers (CT Series)

Current Transformers (CT Series)
TOROIDAL CT APPLICATION DATA
To obtain current measurement:
• Pass the wire carrying the current to be measured through the window of the C.T. transformer (acting as a
primary winding).
• Connect the C.T. secondary to an ammeter with a 5 A movement.
For higher accuracy or higher VA burden rating:
• Choose a C.T. with a primary which is a multiple of the required primary rating and which has the accuracy or VA burden you require.
• Loop the wire carrying the current to be measured through the window a number of times equal to the multiple.
This "winding" will reduce the ratio back to required primary rating.
• Example "A": To obtain an accuracy of 1.2% at 10VA burden with a ratio of 100:5, use a C.T.400 and loop 4
primary turns through the window.
• Example "B": To obtain a 25:5 ratio, use a C.T.75 with 3 primary turns to yield 2% accuracy or a C.T.50 with 2
primary turns to yield 3.2% accuracy.
SMALL CURRENT TRANSFORMERS
• Designed for a 5 amp. primary (maximum 20 Amp), secondary current 5 ma.
• 40 - 1,000 Hz. operation.
• Customer to supply primary winding (1 turn through open top of transformer bobbin).
• Two hole chassis mount or P.C. board pin mount.
• Both units have 5 ma. secondary for use with standard AC ammeters with 5 ma.movements.
• High accuracy windings (1%).
Part No.
Mounting
CT5CF
CT5PC
Chassis
P.C. Board
Overall
Dimensions
(Inches)
H
D
W
1.25 1.10 2.063
1.40 1.08 1.03
Mtg.
Hole
(Inches)
Ship
Wt.
oz.
0.187
n/a
2.6
1.8
APPLICATION DATA
Instrument
To obtain current measurement:
1.Pass the wire carrying the current to be measured through the window of the current transformer (acting as a primary winding).
2.Connect the secondary to an ammeter with a 5 mA movement.
EUROPE
Basingstoke, UK 01256 812812
AUSTRALIA
Queenstown, Australia 61-8-8240-2244
CANADA
www.hammondmfg.com
Guelph, Ontario (519) 822-2960
St. Laurent, Quebec (514) 343-9010
109
Cheektowaga, NY (716) 630-7030
USA
©