The document discusses reheater protection to prevent reheat tubes from starvation. It outlines the conditions that must be met for reheater protection to be enabled or disabled, including drum pressure above 30ksc, openings of high or low pressure bypass valves, feeders on or boiler firing, turbine valve positions, generator circuit breaker status, and bypass valve positions. It also indicates there is a loss of reheater protection signal.

1. BOILER REHEATER PROTECTION
TO PREVENT REHEATER TUBES FROM STARVATION

2. HPBP 1
HPBP 2
HPT IPT LPT
Condenser
HOTWEL
LPBP 2
LPBP 1
REHEATER
MAIN STEAM REHEAT STEAM
HRH
CRH
HPSV 1 HPCV 1 IPCV 1
IPSV 1
HPSV 2 HPCV 2 IPCV 2
IPSV 2
CRH NRV

3. REHEATER PROTECTION ENABLING:-
A
N
D
REHEATER PROTECTION ENABLED
DRUM PRESSURE > 30KSC
ANY HPBP OPENS>2%
ANY LPBP STOP V/V AND
CORRESPODING C/V OPEN >2%
ANY FEEDER ON OR BOILER FIRING ON
No MFT

4. A
N
D
O
R
REHEATER PROTECTION ENABLED
TURBINE IP V/VS AND LPBP CLOSED
TURBINE HPV/VS AND HPBP CLOSED
A
N
D
O
R
GENERATOR CB OPEN
BOTH LPBP CLOSED
Both HPBP CLOSED
O
R
REHEATER PROTECTION LOSS
REHEATER PROTECTION LOSS

5. THANKS