Cummings diesel generators

20Nov13

Recent generator usage:
09mar18: hf test, gen 3 goes offline.
01dec13: generator startup with site as load.
19nov13:Monitoring generators with sband Tx on
     -Performance
02dec17: gen4 failure.
05dec17: sb tx power vs generator power for 2017
07dec17: sb tx beam voltage vs  generator output power.

Yearly Usage:
Documentation:

Intro

    The site has 4 1 MegaWatt  Cummings generators. They are used for backup site power and running the sband transmitter.

Monitoring the generators. 

  The generators can be queried using the modbus protocol. The program that does this:



Recent generator usage:

    The plots show the generator usage for:

Page 1:
Page 2:

processing: x101/generator/cgenstatdaily.sc

Fuel deliveries and Fuel usage:

date
time
delivery
(gallons)
Stick measurement
when fuel added
(gallons)
GenMeter
when fuel added
(Cumulative)
Fuel used
between deliveries
ratio
FuelGenMeter/
FuelStick
Daily Usage
Gal/Day
before
after
Stick
genMeter
stick
GenMet
171021
12:00
2000
-
9130
758272.
-
-
-
-
-
171028
11:00
5000
5167
10321
763612.
3963
5349
1.35
569
767
171107
14:00
5000
4163
9153
771072
6158
7460
1.21
608
736
171116
07:00
6000
3835
9900
778005
5318
6934
1.30
611
796
171122
07:00
4000
6075
10170
782650
3825
4644
1.21
637
774
171129
07:00
4000
5677
9755
788240
4493
5590
1.24
642
799
171206
10:30
5000
4662
9755
794675
5093
6436
1.26
713
901
   
processing:x101/generator/totFuel.pro

01dec13: Generator startup with site as load. (top)

    The power failed on Sunday 01dec13 at 17:39:20. The site was the generator load.
The plots show the generators for  the first 10 minutes after startup (.ps) (.pdf):

Summary:

processing: x101/131202/genstartup.pro

19Nov13: first look at data while sband transmitter is on. (top)

    Data was taken on 19Nov13 while the sband transmitter was in operation. They sband  was transmitting around 850 KWatts.

    The plots show the generator performance for 3 hours (.ps) (.pdf)

Summary:

Performance for  the 3 generators combined:

Power
2180 KW
Full power
11 KW
startup (cooling off)
80 KW
startup (cooling on)

Pumps use 70 KW
powerFactor
> .9
above 750 KW
fuel consumption
linear  above 700 KW

26 Gal/Hour
startup cooling off. Fuel rate for no load.
31 Gal/Hour
startup cooling on
187 Gal/Hour
full power
Efficiency
KW for 1 Gal/Hour
Efficiency
1 Gallon of diesel = 40.7 KWHr
11.8 KW
29%
Full Power
2.5
6%
pumps on, no HV xmter
.7 KW
1.7%
pumps off, no load.
processing:x101/131119/cgen.pro

171202: Gen 4 failure. (top)

    Generator 4 had been offline while its exciter windings were being rewound.
On 02dec17 generator 4 was tested after reinstalling the exciter. After being brought up, the generator failed with a short circuit error (extended status).

The plots show gen 4 failure (.ps) (.pdf):

processing: x101/171202/gen4fail.pro


171205: sbTx pwr vs generator output pwr for 2017 (top)

    The sband transmitted power was plotted vs the generator output power for the year 2017.
Making the plot:

The plots show the sbTx power vs generator power for 2017 (.ps) (.pdf):

Observations:

Processing: x101/171205/sbtxvsgenpwr.pro

171207: generator power vs sbTx beam voltage (top)

    AO lost public power after hurricane maria (20sep17). The outage continued into dec17. The sband  group would like to observe an object in mid december. The question is how many generators will be needed.

    The requirements/constraints for the experiment are:

    I searched through recent (1klystron usage)  sband tx logfiles  for when the beam voltage was first turned on. I wanted to plot beamVoltage versus the generator power output. This data had to overlap in time:

    The best data set (beam voltage was not brought up really fast) was on 01sep17. This was a single klystron run looking at clementine.

The plots show the generator power and sbTx beam voltage vs time (.ps) (.pdf):

Summary:

processing: x101/171207/sbtxBmV_genpwr_170901.pro


180309 generator 3 failure during hf test

    An hf test was done on 09mar18 using generators 2 and 3 (1 and 4 are being repaired).
Around 14:20 generator 3 took itself offline with a over temp coolant message. Prior to this there had been warning messages of low pressure and high temps.

The plots show the generator status during the hf test (.ps) (.pdf):

Summary

processing: x101/180309/genstat.pro


Yearly usage (top)

    Hour used and fuel consumed .. by generator and totals.

processing: x101/generator/chkusage.pro


Documentation:  (top)



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