Phoenix Contact SCK-M-I-4S-20A Handleiding (128 Pagina's)

Handleiding

SOLARCHECK family

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PHOENIX CONTACT 105608_en_02

3.2.1 Current measurement

Hall sensors are used for contact-free current measurement. For measurement purposes,

the PV string cables are fed through the holes in the module in the specified direction. Each

channel is equipped with a separate sensor. This means that all connected strings can be

measured independently of one another.

Figure 3-1 Channels for current measurement/feed-through direction

The channel assignment is printed on the side of the housing.

Figure 3-2 Assignment of the current measuring channels

Hall sensor measuring technology

The cable feed-throughs in the device are surrounded by ferrite cores which absorb and

concentrate the magnetic field of the live conductor. A Hall sensor positioned in an air gap

in the ferrite core generates a voltage signal proportional to the strength of the magnetic

field. This voltage signal can then be used directly to determine the current strength. Since

the current direction also determines the direction of the magnetic field, this measuring tech-

nology can also be used to indicate the current direction. As a result, reverse current detec-

tion is integrated in the SOLARCHECK current measuring devices.

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