7
Capacitive voltage indicator (divider)
The transformer can be supplied with the capaci-
tive voltage indicator on the request. Integrated
voltage detection system is corresponding to Sep-
arable Voltage Detection System according to IEC
61234-5. It is integrated coupling electrode con-
nected to secondary terminal (terminal Ck).
Elec-
trode acts as a capacitor between electrode and
primary winding (C1), or electrode and ground
(C2).
If the electrode is connected to indication de-
vice (not part of delivery – it is part of switchgear)
it works as indication of voltage presence – more
in IEC 61234-5.
Ub (kV)
C1 (pF) >
C2 (pF) >
3 – 5.4
30
20
5.5 – 7.2
25
20
10 – 13.5
20
20
13.8 – 17.5
15
20
20 – 40
10
20
Tab. 3. CE capacity according to nominal voltage
Note:
Recommended min. capacities for nominal
voltage.
Fuses
The fuse can be a part of a supply of voltage trans-
formers with fuse. We can supply following fuses:
Rated
current (A)
Rated voltage
(kV)
Length
(mm)
Striker pin
0.5 – 6.3
12/17.5
192
YES*/NO
0.5 – 6.3
24
292
YES*/NO
2 or 4
36
440
NO
0.3 or 0.6
12/24
255
NO
(*) Available only for certain types
Tab. 4. List of offered fuses
Warning:
All VT’s type TJP 4.0; TJPH 4.0; TJP 5.0;
TJPH 5.0; TJP 6.0, have fuse contact equipped
with fixation. Fuse contact fixation is used just
for transportation. Before installation must be
removed. See picture Fig. 9. and Fig. 10.
For safety fuse replacement see Instructions for
installation, use and maintenance for Voltage (po-
tential) transformers Fuse replacement
(1VLM000614).
External fuse holder
No special tools are needed for the installation of
external fuse holder and It can be installed in any
direction. All the necessary mounting accessories
are a part of delivery and shall be used for fixing
the fuse holder on the top of the VT. Maximum al-
lowed torque for screw connection is 20 Nm.
4. Instructions for use
Current and Voltage instrument transformers are
used:
•
to convert large currents or voltage in the pri-
mary circuit to an appropriate level for second-
ary circuit equipment (relays and meters);
• to insulate primary and secondary circuit from
each other to protect the secondary equipment
from the harmful effects of large current or volt-
age appearing during the operation (short cir
-
cuits).
The use of current or voltage transformer for
other purpose than described above is forbidden
if not agreed with the producer.
—
10 Delivered VT with
fixation
—
11 Fixation removing
—
10
—
11
Содержание BB 103
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Страница 25: ...25 Dimensional Drawings TTR TTR 4x xx TTR 6x xx ...