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Technical
Section 9
Dimensions
Section 10
5
CT current transformers
Metering and
measurement
CT with let-through primary.
16453.
16462.
16542.
16453 + 16550.
Sealable cover.
Function
The Ip/5A ratio current transformers deliver at the secondary a current of 0 to 5 A that
is proportional to the current measured at the primary. They are available in two major
families:
Cable current transformers
b
b
Bar current transformers.
b
b
This allows them to be used in combination with measurement instruments:
ammeters, kilowatt-hour meters, measurement units, control relays, etc.
Common technical data
Secondary current: 5 A
b
b
Max. voltage rating Ue: 720 V
b
b
Frequency: 50/60 Hz
b
b
Safety factor (sf):
b
b
40 to 4,000 A : sf
v
v
y
5
5,000 to 6,000 A : sf
v
v
y
10.
Degree of protection: IP20
b
b
Operating temperature: tropicalised range, -25 °C to +60 °C, relative
b
b
humidity > 95 %
Compliance with standards: IEC 60044-1 and VDE 0414
b
b
Secondary connection (as per model):
b
b
By terminals for lug
v
v
By tunnel terminals
v
v
By screws
v
v
Connection
CT with primary connection by screw and nut.
Use of cylinder 16550 or 16551.
The three references 16482, 16483 and 16534 have a double connection output at
the secondary: twice S1 and twice S2. The terminals are in parallel, as there is only
one secondary winding.
The unused secondary outputs must not be connected.