Line and transformer protection
by circuit breaker
VIP 30, VIP 35
In contrast to fuses, the circuit breaker has no minimum breaking current,
which means that it is particularly well-adapted to transformer protection.
VIP 30 and VIP 35 self-powered protection relays
VIP 30 and VIP 35 are self-powered relays, requiring no auxiliary power supply,
which are fed by current sensors, activating a MITOP release.
VIP 30 protects against phase to phase faults.
VIP 35 protects against phase to phase faults and earth faults.
Protection system
The protection system operates without an auxiliary power supply, and includes:
3 transformers with integrated toroids on the transformer feeder bushings
1 VIP 30 or VIP 35 electronic relay
1 release
1 test connector to check whether the protection unit is operating correctly,
using the VAP 6 unit.
Description
The relays are assembled in a housing, and the front faces are protected
a transparent cover. The whole assembly has a degree of protection of IP54.
Settings are made on the front, using rotary switches.
The phase operating current is adjusted directly according to the transformer
rating and the operating voltage.
The earth current set point is adjusted according to the network characteristics.
Phase protection
Phase protection is provided by an IDMT set point which operates as of 1.2 times
the operating current (Is). VIP 30 and VIP 35 phase protections are identical.
Earth protection
Earth fault protection operates with measurement of the residual current carried
out using the sum of the secondary currents of the sensors.
Earth protection operates in definite time: both its set point and time delay
are adjustable.