Omicron CPC 100, Reference Manual

Page: 364 / 382

CPC 100 V1.41
17 - 14
CP SA1
The CP SA1 is a surge arrester unit providing extra protection to the operating
staff and CPC 100 against high-voltage hazards while performing
transformerwinding resistance measurements. In case of unwanted disruption
of the current path, high voltage due to the inductance of the transformer’s
winding appears on the transformer’s terminals and the current can flow through
the voltage path to the
CPC 100 V DC input. If high voltage appears for a short
time on the transformer’s terminals, an arc discharges the voltage and
distinguishes without destroying the
CP SA1 . If the arc persists for a longer time
period, the surge arrester insulator melts and thereby short-circuits the terminals
to ground. Figure 6 below shows the circuit diagram of
CP SA1 .
Figure 6:
CP SA1 circuit diagram
Before using the CP SA1 , check whether it is intact as follows:
1. Select the Resistance test card.
2. Select the V DC (2-wire) output range.
3. Connect CP SA1 to the CPC 100 V DC input.
4. Short-circuit the CP SA1 ’s output and measure the resistance.
If the measured resistance < 1
Ω
, the test is passed.
5. Remove the short circuit and measure the resistance again.
If the measured resistance > 20 k
Ω
, the test is passed.
Ordering Information for CP SA1
Table 10:
CP SA1 ordering
information
Surge
arrester
Fuse 1 A
super flink, leaded
270 k
Ω
Fuse 1 A
super flink, leaded
Plug to CPC 100
Socket to
power transformer
Ordering Information CP SA1 Article number
CP SA1 VEHZ0665