L2275
Emax UL
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Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
15.3
Putting into service
15.3.1 Connections
For the connections to be provided by the user, it is recommended to strictly follow what is indicated in this document.
This means that we shall be able to satisfy all the international reference Standards and guarantee perfect operation of the trip unit even under
severe environmental and electromagnetic conditions.
Pay particular attention to the types of cable, the connections to ground and the maximum distances recommended.
15.3.2 VT Connections
15.3.2.1
Summarized Table for VT connections
Types of transformers:
TV ABB SACE:
ABB SACE model TV055 transformers (with nominal secondary voltage =100
√
3 V).
TV Custom (A):
single custom-made “ad hoc” transformers with the same electrical characteristics as the ABB SACE VT
(ABB SACE RE0382 drawing)
TV Standard (A): single standard transformers “compatible” with ABB SACE VT
(the same electrical characteristics except for the output voltage: Us=100Vrms).
(A): The VTs must have a performance of between 1 VA and 5 VA max., 4 kV insulation between primary and secondary and towards the shield, primary impedance of
600 ohm; class 0.5. They must be of the insulation type (fitted with metal shield between the two windings) with the shield grounded.
Caption:
UV: Undervoltage protection; OV: Overvoltage protection; D: directional protection; n.c.: not allowed.
Note 1:
- In application diagram B, the RV (residual voltage) protection is not correctly operative
Note 2:
- for TN-C systems the connection must be carried out on PEN
- for TN-S systems the connection must be carried out on N for configurations with neutral or on PE for configurations without neutral as shown in
application diagram A; in the case where the PE is used, the current on this could be around a dozen mA. If the customer considers this value too
high or has a residual current protection which risks intervening, application diagram B must be used (see notes 1 and 3)
- for IT and TT systems with neutral, the connection must be carried out on N
Note 3:
- For the TV054 transformer, the Up (primary voltage) and Us (secondary voltage) voltages are starred voltages (phase-neutral).
- For the VT_ADAPTER adapter, the line voltage is intended as line-to-line (phase-phase).
Note 4:
- For voltages lower than 230V or higher than 690V, the protection functions which make reference to the voltage measurements cannot be used.
Note 5:
- Exclude functions UV, OV, RV and D. The voltage and power measurements are calculated using a reconstructed star center.
15.3.2.2 Connection application diagrams
Application diagram B (see Note 1 and Note 3)
Application diagram A (see Note 3)
VT_Adapter
Input connections
Up
'
(
)
Up < 230 V
See note 4
230…277 V
A1
A2
A3
347…480 V
B1
B2
B3
500…690 V
C1
C2
C3
Up > 690 V
See note 4
Application
Application Application
diagram
Functionality
diagram
Functionality
diagram
Functionality
TN-C
A
Total
D
Total
C
Note 5
TN-S
A/B
Total
D
Total
C
Note 5
IT with neutral
A
Total
D
Total
C
Note 5
I T
B
Note 1 and 4
n.c
—
C
Note 5
TT with neutral
A
Total
D
Total
C
Note 5
TT without neutral
B
Note 1 and 4
n.c
—
C
Note 5
ABB SACE VT type transformer
(Star/Star)
“VT Custom” type transformer
(Star/Star)
“VT Standard” type transformer
(Delta/Delta)
Installation System
