Page 129 - Sace Emax 2 Catalogue

ACCESSORIES 6/27

Current sensor for neutral conductor outside the circuit-breaker (Fig. 39)
This is only for three-pole circuit-breakers; it enables protection of the neutral conductor to be
achieved through connection to the Ekip trip unit. It is supplied on request.
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Electrical diagram reference: figure 27
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Fig. 39
Homopolar toroid for the earthing conductor of main power supply (Fig.40)
The distribution and generator protection versions of the Ekip Touch and Hi-Touch trip
units can be used with an external toroid positioned, for example, on the conductor that
connects the star centre of the MV/LV transformer to earth (homopolar transformer): in this
case, the earth protection is called Source Ground Return. There are four sizes of the toroid:
100A, 250A, 400A, 800A. The homopolar toroid is an alternative to the toroid for differential
protection.

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Electrical diagram reference: figure 25
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Fig. 40
Toroid for differential protection (Fig. 41)
Connected to the Ekip Touch and Hi-Touch LSIG trip units equipped with a rating plug for
differential protection, this toroid enables earth fault currents of 3…30A to be monitored.
To be installed on the busbar system, it is an alternative to the homopolar toroid.

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Electrical diagram reference: figure 24 06
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Fig. 41

Dedicated terminal for Modified Differential Ground Fault (MDGF) protection (Fig. 42)
This terminal is needed to realize the MDGF scheme with SACE Emax 2 circuit-breakers. Two types of ter-
minal are available: one for the fixed circuit-breakers and one for the withdrawable ones. The application
needs the mounting of external phase current transformers and summing current transformers. SACE
Emax 2 MDGF scheme is compatible only with current transformer from Amram that must be purchased
separately. External current transformers must have the same rating of the circuit-breaker rating plug.

— For the complete application wiring diagram, please refer to 1SDM000019A1001. Listed below the com-
Fig. 42 mercial codes of Phase CTs and Summing CTs compatible with SACE Emax 2 MDGF scheme.

Current rating (A) Phase current transformer Summing current transformer
800 CT409-801-01 CT550-5X4-01000
1600 CT409-162-01 CT550-5X4-02000
2000 CT421-202-01 CT550-5X4-02500
2500 CT421-252-01 CT550-5X4-03125
3200 CT421-322-01 CT550-5X4-04167
4000 CT421-402-01 CT550-5X4-05000
5000 CT421-502-01 CT550-5X4-06250