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Source-changeover systems
Electrical interlocking
Electrical interlocking is carried out by an electrical control device.
For Compact NS630b to 1600, this function can be implemented in one of two ways:
using the IVE unit
b
by an electrician in accordance with the chapter "Electrical Diagrams" of the
b
catalogue source-changeover system.
Characteristics of the IVE unit
external connection terminal block:
b
inputs: circuit breaker control signals
v
outputs: status of the SDE contacts on the “Normal” and “Replacement” source
v
circuit breakers
2 connectors for the two “Normal” and “Replacement” source circuit breakers:
b
inputs:
v
- status of the OF contacts on each circuit breaker (ON or OFF)
- status of the SDE contacts on the “Normal” and “Replacement” source circuit
breakers
outputs: power supply for operating mechanisms
v
control voltage:
b
24 to 250 V DC
v
48 to 415 V 50/60 Hz - 440 V 60 Hz.
v
The IVE unit control voltage must be same as that of the circuit breaker operating
mechanisms.
Electrical interlocking is used with a mechanical
interlocking system.
An automatic controller may be added to take into
account information from the distribution system.
Moreover, the relays controlling the “normal”
and “replacement” circuit breakers must be
mechanically and/or electrically interlocked to
prevent them from giving simultaneous
closing commands.
Necessary equipment
For Compact NS630b to 1600, each circuit breaker must be equipped with:
a motor mechanism
b
an available OF contact
b
a CE connected-position contact (carriage switch) on withdrawable circuit
b
breakers
an SDE contact.
b
DB128058
IVE unit.
DB110903
Standard configuration for Compact NS
Types of mechanical interlocking
Possible combinations Typical electrical diagrams
Diagram no.
2 devices
QN
QR
Compact NS630b to 1600:
0
0
b
electrical interlocking with lockout after fault:
1
0
v
permanent replacement source (without IVE)
51201180
0
1
v
with EPO by MX (without IVE)
51201181
v
with EPO by MN (without IVE)
51201182
v
permanent replacement source (with IVE)
51201183
v
with EPO by MX (with IVE)
51201184
v
with EPO by MN (with IVE)
51201185
b
automatic control without lockout after fault:
v
permanent replacement source (without IVE)
51201186
Functions and characteristics