Hi All,
here i want your help to plz guide me how generator & bus voltage's POINT NAME i can find as i already checked in IO.ASG file that shows point name like <pre>
GEN_VOLTS_AB GEN_VOLTS_AB V64K ;P -PTBA-032 TCCB Gen PT Volts 1
GEN_VOLTS_BC GEN_VOLTS_BC V64K ;P -PTBA-033 TCCB Gen PT Volts 2
GEN_VOLTS_CA GEN_VOLTS_CA V64K ;P -PTBA-034 TCCB Gen PT Volts 3
BUS_VOLTS_AB BUS_VOLTS_AB V64K ;P -PTBA-029 TCCB Bus PT Volts 1
BUS_VOLTS_BC BUS_VOLTS_BC V64K ;P -PTBA-030 TCCB Bus PT Volts 2
BUS_VOLTS_CA BUS_VOLTS_CA V64K ;P -PTBA-031 TCCB Bus PT Volts 3</pre>
but in LONG NAME file POINT NAME for above PT(s) are like DV (for Gen. Volt) & SVL (for BUS Volt).

I got confused that as per my knowledge all point names are assigned in IO.ASG but here in this case point name are assigned from where I can't understand.

One more think that how these signals are scaled. & shows 11.5 KV on display.

Please help me I will be very thankful to you.

 

Do you have a MKV Application Manual? If you have, take a look at Page 30 in Appendix B and Page 64 in Appendix D and this should explain all to you. If not, I will try and explain. The GEN & BUS voltage signals come from PTs usually installed in the Generator Control Panel. I/O config will then scale 115v a.c. from the PTs to xxKV (11.0, 13.8 or whatever) which you set in the <Q> core IOMA section of I/O config. These values will then become DV & SVL. This is all done in the <P> core in PTBA/TCEB & TCCB cards

 

As with all things Speedtronic, there are undocumented "features" that can be very mysterious until they are learned.

There are several signal names for inputs that are not generally found in IO.ASG. I believe the designers did this because these are considered very "critical" signals and some of the BBLs have these signals passed to them automatically (as opposed to being assigned to the blocks in the CSP Editor). So, if some well-intentioned individual decided unilaterally to rename the signal (say from TNH1 to SPEED), then the blocks that were expecting TNH1 would never see the value of shaft speed! (And this happened on a couple of early jobs, when well-intentioned field engineers decided to make the signal names "easier to read" and then the turbine wouldn't run and, of course, it was the Mark V's fault!!!)

I believe that turbine speed (TNH or TNH1), and flame detector intensity (FD_INTENS_n, where "n" is 1 through 8), generator terminal voltage (DV, or Driven Voltage), and running, or bus, voltage (SVL, or Station Voltage-Line) are most, if not all, of the "pre-named" signals in the Mark V CDB (Control Signal Database) that are not usually found in IO.ASG.

As for the scaling, well, that depends entirely on the vintage of the Mark V, as that was done differently during different stages of the Mark V production. You just need to find the signal name that is being used to display the value on a screen, and then use Dynamic Rung Display or the CSP Printout and -Cross-Reference to see how that signal is derived.

Very early Mark Vs scaled the signal at the I/O card level, but that was changed quickly as it was very cumbersome and difficult when they are so many PT transformer ratios in use around the world to make it easier to scale the PT inputs, usually in terms of PCT of PT rating. Then that percentage was multiplied by a "gain" (KV/%) in the CSP to produce signals with engineering units in KV. Usually, but not always, those signal names were SVLX and DVX (the "X" meaning "auxiliary").

Hope this helps!