Checking For Operating Speed And Time - ABB HPA 12kV Instruction For Installation, Service And Maintenance

12. Open the charging valve until a reading of 2.5 bar (20 C) is registered on the
metering gauge.
13. Close cylinder main valve.
14. Close both charging and metering valves.
15. Loosen the snap connection.
Note: The hose contains gas at a pressure of 2.5 bar and this will blow out.
16. Loosen the metering unit until gas begins to escape, then disconnect
immediately the metering unit so that the back pressure valve in the pole
automatically closes.
17. Disconnect metering unit.
18. Check the O-ring of the covers, if they are dry, exchange with new ones
which have been greased with ABB grease IN 1171 4014 - 49.
Note: Mineral grease must not be used on EPDMO - rings. Replace the cover
on the connection nipple.
1.3.4 Checking of operating speed and time
Checking of operating speed can be made with a capacitive sensor. The
sensor is connected to a conventional oscilloscope. The curve shown in fig. 9 shows
what valves should be obtained on the oscilloscope.
Closing speed (a/10)
Opening speed (b/10)
Closing time with nominal voltage max.
Opening time with nominal voltage
Contact travel
2.0 - 2.5 mtrs. / sec.
3.6 - 4.3 mtrs. / sec.
75 ms
36 - 45 ms
62 - 66 mm
Fig - 9
(Travel diagram)
(16)
0