ACCESSOR I ES
6/27
Current sensor for neutral conductor outside the circuit-breaker (Fig. 39) Only suitable for three-pole circuit-breakers; the current sensor enables protection of the neutral conduc- tor to be achieved through connection to the Ekip trip unit. Supplied on request.
— Electrical diagram reference: figure 27
— 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 ground (homopolar transformer): in this case, the ground protection is called Source Ground Return. There are four sizes of the toroid: 100A, 250A, 400A, 800A. The homopolar toroid is an al- ternative to the toroid for differential protection.
— Electrical diagram reference: figure 25
— 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 pro- tection, this toroid enables ground fault currents of 3…30A to be monitored. To be installed on the busbar system, it is an alternative to the homopolar toroid.
— Electrical diagram reference: figure 24
— 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 termi - nal 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 - mercial codes of Phase CTs and Summing CTs compatible with SACE Emax 2 MDGF scheme.
— Fig. 42
Current rating (A)
Phase current transformer CT409-801-01, or CT420-801-01 CT409-122-01, or CT420-122-01
Summing current transformer
800
CT550-5X4-01000 CT550-5X4-01515 CT550-5X4-02000 CT550-5X4-02500 CT550-5X4-03125 CT550-5X4-04167 CT550-5X4-05000 CT550-5X4-06250
1200 1600 2000 2500 3200 4000 5000
CT409-162-01
CT409-202-01, or CT421-202-01 CT409-252-01, or CT421-252-01 CT409-322-01, or CT421-322-01
CT421-402-01 CT421-502-01
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