BFP VFD
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Transcript of BFP VFD
BFP WITH VFD
G. ROZARIO
6.6 KV Breaker
6.6 KV Breaker
VFDVFD
BFP-1BFP-1 BFP-2BFP-2
QS-1
QS-2
QS-3
QS-4
QS-5
QS-6
BFP-1 VFD MODEBFP-1 DOL MODE
0 – 100%
BFP-2 VFD MODEBFP-2 DOL MODE
VFD READY TO START
VFD TRIP FEEDBACKSEVERE FAULT
VFD FAULT ALARM
SPEEDSPEED
AMPSAMPS
LOADLOAD
BFP - VFD
BFP-1 AMPS BFP-2 AMPS
BFP DISCH PRESSURE 125 KSC BFP FEEDWATER FLOW 172 TPH
BFP-1 READY TO START PERMISSIVE INTERLOCK TO VFDLube oil pressure healthy >1KSC.
De-aerator level normal (Individual Transmitter)+ 200 mmwc (60%).
Suction pressure is healthy > 1.85 (LOW 1.5KSC)
Vibration / temperature normal.
Discharge MOV closed or if it is auto standbythen Auto & Standby mode should be selected.
&
BFP-1 Ready to Start Permissive interlock to VFD
&
VFD Ready to Start Available
VFD Fault / Trip is not present
QS1 & 2 Close Feedback present
BFP-1 Ready to start Permissive
ON Command
BFP-1 VFD START PERMISSIVE TO START FROM DCS
BFP-1 READY TO START PERMISSIVE DCSLube oil pressure healthy >1KSC.
De-aerator level normal (Individual Transmitter)+ 200 mmwc (60%).
Suction pressure is healthy > 1.85 (LOW 1.5KSC)
Remote selection.
Vibration / temperature normal.
Discharge MOV closed or if it is auto standbythen Auto & Standby mode should be selected.
&
BFP-1 Ready to Start Permissive
&
BFP -1 START PERMISSIVE AVAILABLE
BFP -1 DOL MODE
DOL START FROM DCS
START PERMISSIVE ENABLE(QS-1 & 2 OPEN ) & QS-3
(CLOSED)
BFP PROTECTION WITH VFD
PRESENT BFP-1 PROCESS PROTECTION
1. BALANCE LEAK OF PRESSURE HIGH =7 KSC.
2. SUCTION PRESSURE LOW =1.5KSC.
3. DEAERATOR LEVEL LOLO ( 40%)
4. LUBE OIL PRESSURE LOLO = 0.4 KSC.
5. TEMP OR VIBRATION HIGH.
ORBFP PROTECTION ACTED
BFP PROTECTION = ADDING VFD
& VFD OFF
BFP1 VFD MODE (QS1 CLOSED)
BFP -1 PROTECTION ACTED
AUTO STANDBY
&
OR
BFP 2 START REQBFP-1 PROTECTION ACTEDBFP-2 DOL MODE(QS4 OPEN & QS6 CLOSED)
BFP2 AUTO SELEC
BFP2 REMOTE
BFP2 START CMD
&
PRESENT AUTO STANDBYBFP 1 RUNNING / BFP2 STANDBY
BFP1 ELEC TRIP FB
BFP2 STANDBY SELECTED
BFP1 RUNNING FB
DISCH HDR PR LOW <120 BARBFP2 STANDBY SELECTED
&
OR& BFP2
START REQ
BFP-1 DOL MODE (QS1 OPEN)
OR BFP2 START REQ&
BFP 1 STOP FB
BFP2 STOP FB
BFP2 RUN SELECTION
QUESTION :
1.AT PRESETN IN CASE OF BFP PROTECTION ACTED BREAKER IS OPENED BY DCS, BUT AFTER VFD INSTALLATION EITHER DCS WILL OPEN THE BREAKER OR IT GIVES OFF COMMAND TO VFD ? 2.WHAT ABOUT RUN OUT PROTECTION? 3.AS VFD IS NOT AN INTELLIGENT DEVICE LIKE DCS AND IT GIVES ON (6.6KV BREAKER) / OFF COMMAND BASED ON ISOLATOR FEEDBACKS, BUT HOW WE CAN ENSURE PROTECTION ?4.IF OPERATOR GIVES LOW FREQUENCY SETPOINT THAN OPERATING FREQUENCY ,WHAT IS THE BEHAVIOUR OF VFD / WHICH ONE IT WILL TAKE?
THANK YOU