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Purchase and/or use of Amran Ltd Current Transformers
constitutes acceptance of Amran’s Terms & Conditions (05/2006) including
acceptance of Amran’s limitation of liability.
Packaging / Handling
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Check the packaging for any damage observed.
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Handle boxes with care. Dropping or jolting the box can damage the products
and/or change the electrical characteristics.
Inspection & Installation
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Installation of Current Transformers should only be performed by a qualified
technician.
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Check the CT visually for any damages. Verify whether any cracks are observed
on top, side or bottom of the CT. If any abnormality is observed, contact us
for further instructions.
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Clean the CT surfaces using a soft cloth before installation.
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For MV CTs - Secondary connections need to be made using ring type lugs with
the nuts provided on the CT terminals, unless specified differently.
Recommended torque value for the tightness is 22 in-lbs. (2.5 Nm). For LV CTs
with secondary studs, recommended torque value is 16.2 in-lbs (1.9 Nm). Do not
over torque the connections.
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For MV CTs mounting bracket and terminal cover should be grounded.
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Primary conductor should be located in the center of CT ID for ring type CTs.
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The normal operating temperature range for the CT is: -25 deg. C to 110
deg. C. The storage temperature for the CT is: -35 deg. C to 125 deg. C.
Although the CT is able to withstand gradual increase or decrease in
temperature; sudden thermal shocks of more than 20 deg c must be avoided.
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CT secondary terminals should not be left open circuited. Operating a current
transformer with open secondary will result in development of LETHAL voltages
on the secondary. We recommend that the installation or service be performed
with the system de-energized.
Recommended Minimum Spacings
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Refer Sketch and table below. Use suitable spacings between (1) unit to unit
and between (2) HV to ground in Air. Same minimum spacings apply to bar type
CTs, window type CTs and wound primary type CTs.
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Recommended minimum spacings are for guidance purpose only. User must set
proper values depending on requirement of High Voltage, BIL, Partial discharge
etc. and depending on environmental conditions such as humidity, altitude and
other configuration/application considerations.
| BIL |
A (Unit to Unit) |
B (HV to Ground in Air) |
| 125kv |
2.0" |
8.0" |
| 110kv |
2.0" |
6.5" |
| 60kv |
0.75" |
3.0" |
Download these instructions here for Current
Transformers (PDF format)>>
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