janitza UMG507, Установка и первый запуск

Страница: 11 / 48

11
Total current measurement
If the current measurement takes place
through two current transformers, the total
conversion ratio of the current transformers
must be programmed in the UMG507.
Example: summation current transformer
Current measurement takes place using one
current transformer with a conversion ratio
of 1000/5A and one current transformer with
a conversion ratio of 200/5A. The total mea-
surement is carried out using a summation
transformer 5+5/5A.
The UMG507 must then be set as follows:
Primary current: 1000A + 200A =
1200A
Secondary current: 5A
Fig.: Example, current measurement using
summation transformer.
The secondary connections of the
current transformer must be short-
circuited at it before the current supply
conductors to the device are discon-
nected!
If a test switch is available, which au-
tomatically short-circuits the current
transformer supply conductors, it is
sufficient to place in in the „Test“ posi-
tion, provided that the short-circuiters
have been previously tested.

Fig.: Example, current measurement using
additional ammeter.
Current measurement
The UMG507 is designed for the connection
of current transformers with secondary cur-
rents of ../1A and ../5A. Only alternating cur-
rents can be measured, not direct currents.
Each current measurement input can be per-
manently loaded with 6A or loaded for 1 sec-
ond with 60A. In systems with voltages up to
150VAC (CATIII) or 300VAC (CATII) to earth
currents of up to 5A can also be directly con-
nected to the UMG507 and measured.
If the current has to be measured with an am-
meter in addition to the UMG507, this must be
connected in series with the UMG507.
Installation