sepam 20 user manual - Schneider Electric

DE80231
DE80231
Installation CSH120 and CSH200
Core balance CTs
PCRED301005EN - 06/2008
DANGER
HAZARD OF ELECTRIC SHOCK, ELECTRIC
ARC OR BURNS
b Only qualified personnel should install this
equipment. Such work should be performed only
after reading this entire set of instructions and
checking the technical characteristics of the
device.
b NEVER work alone.
b Turn off all power supplying this equipment
before working on or inside it. Consider all
sources of power, including the possibility of
backfeeding.
b Always use a properly rated voltage sensing
device to confirm that all power is off.
b Only CSH120, CSH200 and CSH280 core
balance CTs can be used for direct residual
current measurement. Other residual current
sensors require the use of an intermediate
device, CSH30, ACE990 or CCA634.
b Install the core balance CTs on insulated
cables.
b Cables with a rated voltage of more than
1000 V must also have an earthed shielding.
Failure to follow these instructions will result
in death or serious injury.
E40465
Assembly
Group the MV cable (or cables) in the
middle of the core balance CT.
Use non-conductive binding to hold the
cables.
Remember to insert the 3 medium voltage
cable shielding earthing cables
through the core balance CT.
CAUTION Connection
HAZARD OF NON-OPERATION
Do not connect the secondary circuit of the CSH
core balance CTs to earth.
This connection is made in Sepam.
Failure to follow this instruction can cause
Sepam to operate incorrectly.
Assembly on MV cables. Assembly on mounting
plate.
E40466
Connection to Sepam series 20 and Sepam series 40
To residual current I0 input, on connector A , terminals 19 and 18 (shielding).
Connection to Sepam series 80
b To residual current I0 input, on connector E , terminals 15 and 14 (shielding)
b To residual current I'0 input, on connector E
, terminals 18 and 17 (shielding).
Recommended cable
b Sheathed cable, shielded by tinned copper braid
b Minimum cable cross-section 0.93 mm² (AWG 18)
b Resistance per unit length < 100 mΩ/m (30.5 mΩ/ft)
b Minimum dielectric strength: 1000 V (700 Vrms)
b Connect the cable shielding in the shortest manner possible to Sepam
b Flatten the connection cable against the metal frames of the cubicle.
The connection cable shielding is grounded in Sepam. Do not ground the cable by
any other means.
The maximum resistance of the Sepam connection wiring must not exceed 4 Ω
(i.e. 20 m maximum for 100 mΩ/m or 66 ft maximum for 30.5 mΩ/ft).
Connecting 2 CSH200 CTs in parallel
It is possible to connect 2 CSH200 CTs in parallel if the cables will not fit through a
single CT, by following the instructions below:
b Fit one CT per set of cables.
b Make sure the wiring polarity is correct.
The maximum permissible current at the primary is limited to 6 kA - 1 s for all cables.
DE51678
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