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Warning!
34
12. Application of the X-ray emission Standards
One of the physical properties of vacuum insulation is the possibility of X-ray emission when the
interrupter contacts are open.
The specific tests carried out at the PTB laboratories (Physikalisch-Technische Bundesanstalt, in
Brunswick - Germany) show that local emission at a distance of 10 cm from the interrupter or pole
surface does not exceed 1 µSv/h.
It follows that:
– at the rated service voltage the use of vacuum interrupters is absolutely safe;
– application of the withstand voltage at power frequency, according to the IEC 62271-100 and
VDE 0670 Standards, is safe;
– application of a voltage higher than the withstand voltage at power frequency or of a direct
current test voltage, specified in the IEC and VDE Standards, cannot be used;
– limitation of the above-mentioned local phenomena, with interrupters with open contacts, de-
pends on keeping the specific distance between the contacts.
This condition is intrinsically guaranteed by correct operation of the drive and by adjustments of
the transmission system.
13. Spare parts and accessories
All assembly operations of spare parts/accessories must be carried out following the in-
structions enclosed with the spare parts, by ABB personnel or by suitably qualified cus-
tomer personnel with in-depth knowledge of the apparatus (IEC 60694) and all the Stand-
ards aimed at carrying out these interventions in safe conditions. Should the maintenance
be carried out by the customer's personnel, responsibility for the interventions remains
with the customer.
Before carrying out any operation, make sure that the circuit-breaker is open, not supplied
(medium voltage circuit and auxiliary circuits) and with the capacitors discharged.
To order circuit-breaker spare parts/accessories, refer to the ordering sales codes indicated in the
technical catalogue and always state the following:
– type of circuit-breaker
– rated voltage of the circuit-breaker
– rated normal current of the circuit-breaker
– breaking capacity of the circuit-breaker
– serial number of the circuit-breaker
– rated voltage of any electrical spare parts.
For availability and to order spare parts, please contact our Service office.
13.1. List of spare parts
– Position sensors
– Position contact of the withdrawable truck
– Contacts signalling racked-in/isolated
– Isolation interlock with the door
– HMI
– Local control panel (see chap. 14.10).
For availability and to order spare parts, please contact our Service office, specifying the serial
number of the circuit-breaker.
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