janitza UMG 512-Pro, Руководство пользователя и технические данные

Страница: 32 / 120

UMG 512-PRO www.janitza.com
32
7.6.1 Current direction
You can correct the current direction for each
phase individually on the device or via the serial
interfaces provided. This means that in the case of
incorrect connection, no subsequent reconnection
of the current transformers is necessary.
7.6.2 Summation current measurement
For a summation current measurement via two
current transformers, first set their total ratio on
the device. The setting of the current transformer
ratios is described in section „11.3.1 Transform-
ers“.
Example:
The current is measured via two current trans-
formers. Both current transformers have a ratio
of 1000/5 A. The summation measurement is
carried out with a summation current transformer
of 5+5/5 A.
The device must then be adjusted as follows:
Primary current: 1000 A + 1000 A = 2000 A
Secondary current: 5 A
UMG
S
2
I
S
1
P
1
P
2
Supply 1 Supply 2
1P
1
1P
2
(K)
(L)
(k)
(l)
1S
2
1S
1
1S
1
1S
2
2S
1
2S
2
2S
1
2S
2
(k)
(l)
(K)
(L)
2P
1
2P
2
Consumer A Consumer B
Fig. Example for current measurement via a summation cur-
rent transformer.
WARNING
Disregard of the connection conditions of the
transformers to Janitza measurement devices
or their components can lead to injuries or
even death or to material damage!
·Do not use Janitza measurement devices or
components for critical switching, control or
protection applications (protective relays)! It
is not permitted to use measured values or
measurement device outputs for critical appli-
cations!
·For Janitza measurement devices and their
components use only “Transformers for mea-
surement purposes” which are suitable for the
energy monitoring of your system. Do not use
“Transformers for protection purposes” !
·Observe the information, regulations and limit
values in the usage information on “Trans-
formers for measuring purposes” , specif-
ically during testing and commissioning of
the Janitza measurement device, the Janitza
component and your system. Voltages above
the permissible voltage range can destroy the
device.
7.6.3 Ammeter
If you want to measure the current not only with
the UMG, but also with an ammeter, connect the
ammeter to the UMG in series.
UMG
S
2
I
S
1
Supply Consumer
A
(k)S
1
S
2
(l)
P
2
(L) (K)P
1
Fig. Circuit diagram with additional ammeter connected
in series