Black Box IC109A-R2 Instalační manuál Strana 133

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12763230-216-229-B1
3
© 2007 Schneider Electric. All Rights Reserved.
Commissioning
Checking Phase Current
Input Connections
LPCT Type Current Sensors
Measuring Phase Current by LPCT
Sensors
The three LPCT current sensors connect through an
RJ45 plug to the CCA671 connector that mounts on the
rear panel of Sepam™, identified as and/or .
see page 20 of this manualfor more information.
Sepam™ enters a fail-safe condition when less than
three LPCT sensors are connected. Such a
configuration is not allowed.
Enter the rated primary current In measured by the
LPCT sensors as a Sepam™ general setting and
configure by microswitches on the CCA671 connector.
Restrictions on the use of LPCT type
current sensors
LPCT type current sensors may not be used for the
following measurements:
b phase current measurements for Sepam™ T87,
M88 and G88 units with ANSI 87T transformer
differential protection ( and connectors)
b phase current measurement for Sepam™ B83
( connector)
b unbalance current measurement for Sepam™
C86 ( connector)
Procedure
The tests that check phase current input connections are the same whether the
phase currents are measured by CTs or LPCT sensors. Only the Sepam™
current input connection procedure and current injection values change.
The ACE917 injection adapter is required to test current inputs connected to LPCT
sensors with a standard injection box. The ACE917 adapter is inserted between:
b the standard injection box
b the LPCT test plug
v integrated in the Sepam™ CCA671 connector
v or transferred by means of the CCA613 accessory
Set the ACE917 injection adapter according to the currents selected on the CCA671
connector. The ACE917 setting should be equal to the number of the microswitch
that is set to 1 on the CCA671.
The injection value depends on the rated primary current selected on the CCA671
connector and entered in the Sepam™ general settings:
b 1A for the following values (in Amps): 25, 50, 100, 133, 200, 320, 400, 630
b 5A for the following values (in Amps): 125, 250, 500, 666, 1000, 1600, 2000,
3150.
Block Diagram (without CCA613 Accessory)
DE51257
B1
B2
B1
B2
B1
B2
Van
Vbn
Vcn
Vr
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