INSTALLATION
291
NVA100X-D - Manual - 02 - 2016
6.3 ELECTRICAL
CONNECTIONS
Electrical connections should be made by referring to the connection diagram; in cases where cer-
tain of the circuits (communication, block, or others) are not used, the relevant connections must
remain open. Examples of connection diagrams are reported on Appendix to this manual.
For the A1...A8, B1...B10 and C1...C8 screw terminals with following characteristics are available:
Nominal cross section:
0.2 a 4 mm
2
(AWG 24...10) for single conductor
0.2 a 1.5 mm
2
for two conductors with same cross section
Tightening torque:
0.5-0.6 Nm
Stripping length:
7 mm
For the IN1C-1...16, IN2D-1...16, OC1E-1...16 and OC2F-1...16 connections, screw terminals with fol-
lowing characteristics are available:
Nominal cross section:
0.14 a 2.5 mm
2
(AWG 26...16) for single conductor
0.14 a 0.75 mm
2
for two conductors with same cross section
Tightening torque:
0.5-0.6 Nm
Stripping length:
8 mm
For the X1...X6 (RS485 and blocks) connections, screw terminals with following characteristics are
available:
Nominal cross section:
0.2 a 2.5 mm
2
(AWG 24...12) for single conductor
0.2 a 1.5 mm
2
for two conductors with same cross section
Tightening torque:
0.5-0.6 Nm
Stripping length:
10 mm
Amperometric inputs
1/5 A CTs
The amperometric input circuits are mounted on the input module (terminals A1...8 for L side and
C1...8 for H side).
In case of replacement of the relay or checks on the amperometric circuits is essential to provide
appropriate support to achieve the secondary circuit shorting. For security reasons it is advisable to
operate in the absence of line current.
When making the current connections, attention must be paid to not exceeding the performance of
the line current transformers. To be exact, the total load, the protective relay, any other protective
relays or measuring instruments and the resistance of the connections, must not exceed the line CT
performance.
•
•
•
•
•
•
•
•
•
Devices must be installed by qualified personnel only.
No liability is accepted from Thytronic due to improper use.
CAUTION
Devices must be installed by qualified personnel only.
No liability is accepted from Thytronic due to improper use.
CAUTION
Voltage inputs
Auxiliary power supply
Side H mperometric inputs
Side L mperometric inputs
NVA100-DX#MM00
I
n
5A
U
AUX
110-230 Vac/dc
100V
100V
I
En
U
En
U
n
1A
1A
5A
1A
5A
Ground connection screw
binary inputs
Output relays
IN2D IN1C
OC1E
OC2F
Optional modules
X1...X4 Block2
Voltage inputs
Auxiliary power supply
Side H mperometric inputs
Side L mperometric inputs
NVA100-DX#MM00
I
n
5A
U
AUX
110-230 Vac/dc
100V
100V
I
En
U
En
U
n
1A
1A
5A
1A
5A
Ground connection screw
binary inputs
Output relays
IN2D IN1C
OC1E
OC2F
Optional modules
X1...X4 Block2
If the secondary of a CT carrying primary current is open circuited, a high voltage can be developed
across the CT terminals.
CAUTION
If the secondary of a CT carrying primary current is open circuited, a high voltage can be developed
across the CT terminals.
CAUTION
