MR MSENSE DGA 9 - Draining; Ventilation

MSENSE
®
DGA 9 7045899/02 EN – 11.2020 Page 78
6.2.9 Draining
This process step drains the extraction chamber. The oil is pumped back into the transformer.
Legend
Condition of components
[1]
Filling level L0 “reached”
[2]
Filling level L1 “reached”
[3]
Filling level L2 “reached”
[4]
Valve V9 “open”
[5]
Flow F1 “present - draining”
[6]
Valve V1 “filling - draining”
[7]
Valve V3/ V7 “open”
[8]
Compressor K1 “operation”
[9]
Valve V4/ V8 “open”
[10]
Valve V2 “open”
[11]
Pump P1 “Operation”
[12]
Valve V5 “closed”
Safety functions and fault detection Draining
Monitored components
Detectable errors
Filling sensors zero acknowledgement, low and high
Filling level L0, L1 or L2 reached
Filling sensors zero acknowledgement, low and high
Flow measurement
Time monitoring
• Flow stops
• Fill the flow
• Filling level timeout (prevents the in-
gress of air into the transformer)
Measurement cell
Measurement cell offline
Pressure sensor in measurement cell
No pressure drop
6.2.10 Ventilation
After draining, the measurement cell is then re-ventilated as per 6.2.8.