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Section 10
End-of-life indication of the
surge arrester
Lightning
protection
9
Various indication devices are provided to warn the user that the loads are no longer
protected against atmospheric overvoltages.
Type 1 surge arresters (with gas filled spark gap)
PRF1 1P 260 V, Combi 1P+N and 3P+N and PRF1 Master
These surge arresters have a light indicating that the module is in good working
order. This indicator light requires a minimum operating voltage of 120 V AC.
The light does not come on:
b
b
if the operating voltage is
v
v
y
120 V AC
if there is no network voltage
v
v
if the spark-over electronics are defective
v
v
Type 2 surge arresters (varistor, varistor + gas filled
spark gap)
PF, PRD
At end of life, the surge arrester or the cartridge are destroyed.
This can occur in two ways:
b
b
Internal end-of-life disconnection: the accumulated electric shocks cause the
v
v
varistors to age, resulting in an increase in leakage current
Above 1 mA, a thermal runaway occurs and the surge arrester disconnects.
External end-of-life disconnection: this occurs in the event of an excessive
v
v
overvoltage (direct lightning strike on the line); above the discharge capacity of
the surge arrester, the varistor(s) are dead short-circuited to earth (or possibly
between phase and neutral). This short-circuit is eliminated when the mandatory
associated disconnection circuit breaker opens
Quick PRD and Quick PF
Whatever the hazards of the power supply network, Quick PRD and Quick PF
incorporate a perfectly coordinated disconnector.
In the event of lightning strikes < Imax: like all surge arresters, they have internal
b
b
anti-ageing protection
In the event of a lightning strike > Imax: Quick PRD and Quick PF are self-
b
b
protected by their integrated disconnector
In the event of neutral disconnection or phase-neutral reversal occurring on the
b
b
power supply:
Quick PRD and Quick PF are self-protected by their integrated disconnector.
To simplify maintenance work, Quick PRD is fitted with local indicators and
draw-out cartridges that are mechanically combined with the disconnector.
Quick PRD has indicator lights on the cartridges and on the integrated
disconnector, so that the work to be carried out can quickly be located.
For safety reasons, the disconnector opens automatically when a cartridge is
removed. It cannot be set until the cartridge is plugged in.
When changing the cartridge, a phase/neutral failsafe system ensures that it can be
plugged in safely.
Operating state continuous display
Quick PRD has an integrated reporting contact to send information about the
operating state of the surge arrester from a remote location.
Monitoring the surge arresters installed throughout the installation makes it
possible to be continuously aware of their operating state and to ensure that the
protection devices are always in good working order.
A reporting contact gives the alert:
b
b
At end of life of a cartridge
v
v
If a cartridge is missing, as soon as it has been removed
v
v
If a fault occurs on the line (short-circuit, neutral disconnection, phase-neutral
v
v
reversal)
In the event of local manual operation (handle down)
v
v
Quick PF has an optional indication reporting auxiliary (SR) that sends information
about the operating state of the surge arrester from a remote location.
Example of indication for PRD.
Example of indication for Quick PRD.