Monitoring the site power
    the plots
    plot description
    programs used for monitoring

Site power documentation
history:
141009: switched to new 13kv line ao -> 129-> ao

Monitoring the site power

A programmable breaker (ABB eVD4) was installed in the power substation in mar13. This breakersmeasures the power, voltage, currents .. at the input to the substation. The information is queried and written to disc once a minute. At 7:10 am every morning plots are made of the power usage from the last 7 days. Once a month plots are made for the entire month:

The plots:

Power substation plots for the last 7 days (.ps) (.pdf):

Monthly substation plots
year	jan	Feb	mar	apr	may	jun	july	aug	sep	oct	nov	dec
2016	(.pdf)	(.pdf)
2015	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)
2014	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)
2013			(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)	(.pdf)

Plot description:

The plots are made once a day (at 7:10 am). The data is sampled once a minute. The frames in each plot are:

Frame 1: power (Kilowatts)

white: apparent power (Kvolts*Iamps) at input
red: active power. This is the power used to do work.

The plot is -Active power. The convention is an inductive load is negative, a capacitive load is positive

blue: minus the Reactive power

Frame 2: Power factor:

Active Power/Apparent power. It is negative since the load is inductive.

Frame 3: Current (amps)

white: phaseA, red phaseB, blue phaseC
solid line (what breaker calls instantaneous power)

This looks like it has a threshold for measurement. When the current changes by a certain amount a new value is recorded.

dashed line: 1 minute demand current provided by breaker. Not sure whether this is a max or average.

Frame 4: Phase to Phase voltage (Kilovolts)

white phaseAtoB, red phaseBtoC, blue phaseCtoA

Frame 5: Phase to ground Voltage (Kilovolts)

white: phaseA, red phaseB, blue phaseC.

Notes on the measurements

The values reported by the browser screen differ from these values by 1 or 2 %.
The browser shows two types of values: _INST_ and _DB_. I think the _DB_ values have been corrected.
The analog input configuration section shows some correction factors (.1 to 1.2%) for some measurements (errors in a/d ?).
I tried applying these corrections to the _INST_ data and got values that were closer but not exactly the same as those reported on the measurement screen of the browser.
In the end, the values shown in the plots have not had any corrections made to them. they are the _INST_ values from the breaker.

Programs used for the monitoring:

/share/megs/phil/svn/aosoft/src/sitepwrlog.c

Program to read the breaker and output the data
Writes to /share/phildat/sitepwr/sitepwr_yyyymmdd.dat

ASCII data

This program runs on aserv11. If the computer reboots it will probably have to be restarted (via)

/share/megs/phil/svn/aosoft/src/sitepwrlog &

Making the plots:

/share/megs/phil/x101/sitepwr:

sitepwrdaily.sc script run via phil's crontab on megs3 to make the daily plots
sitepwrdaiily.pro idl code to make the plots

Site Power

Monitoring the site power

The plots:

Plot description:

Programs used for the monitoring:

Site power Documentation: