The number of signals in Acquisition Group 2 is higher than in Acquisition Group 1 and the former is recorded in numbered files. Click the GO Acquis button to start the acquisition, display, and recording of Group 2 signals.

The sampling frequency is preset at 200 per second. The display refresh rate is set to 250 milliseconds. The monitor display range is set to 5,000 samples or the equivalent of 25 seconds.

The settings are as follows:

Decimation	Sample frequency by the number of steps. Preset value: 100.
Frame	Screen Refresh rate in seconds or milliseconds. Preset value: 0.25 second.
Buffer size	Screen display range by the number of samples displayed. Preset value: 5,000.

The parameters to manage the recording file are the following.

The sampling rate is 200 per second; the recording range contains 2,000 samples per signal, corresponding to a duration of 10 seconds during which no data is lost.
The recording buffer is preset to 1.97 MO for an available range of roughly 10.5 seconds, which is adequate to record 2,000 samples of 117 signals of 8 bytes in 10 seconds.
The file capacity is 850 MO, enough to record signals during approximately 90 minutes.
The duration indicator of the acquisition sequence (thermometer shape) is limited to 1 hour so the user can stop the acquisition of Group 2 before reaching this limit.

List of signals from acquisition group 2

Speed Tested Unit PLL (filt)	The actual rotating speed of the tested unit. Not the frequency of the island. Filtering time constant of 20 ms.
Mean Speed	Mean rotating speed for the pre-defined period.
Mean Power	Mean mechanical power for the pre-defined period.
Mean Servo 1	Mean value of the first servomotor (wicket gate) stroke for the pre-defined period.
Servo 1 (filt)	Gate or valve servomotor stroke. Filtering time constant of 20 ms.
Servo 2 (filt)	Blade servomotor stroke or deflector position. Filtering time constant of 20 ms.
Lin Model Servo 1 (filt)	Gate servomotor stroke from the linear model of the speed governor. Filtering time constant of 20 ms.
Lin Model Mech Power (filt)	Mechanical power from the linear model of the turbine. Filtering time constant of 20 ms.
Non Lin Mech Power (filt)	Mechanical power from the non-linear model of the hydraulic turbine. Filtering time constant of 20 ms.
Estim Mech Power (filt)	The mechanical power of the tested unit in p.u. From estimation using electrical power and acceleration power. Filtering time constant of 20 ms.
Elec Power Tested Unit (filt)	Electrical power of the tested unit in p.u. Filtering time constant of 20 ms.
Acc Power Tested Unit (filt)	Acceleration power of the tested unit in p.u. Filtering time constant of 20 ms.
Speed Dev Tested Unit PLL (filt)	Speed deviation of the tested unit. Not from the frequency in the island but from the actual rotating speed. Filtering time constant of 20 ms.
Total Sim Mec Power Island pu: Simulated	Mechanical power in the island. In p.u. of the total MVA.
Simulated Frequency Dev Island	Simulated frequency deviation in the island in p.u.
Simulated Frequency Island	Simulated frequency of the island in p.u.
Cmd from Berta Controller	Command to the servomotors from Berta’s controller.
Idc_fq_fm_plant	Signal input in AD12 (channel 11) in volts. Corresponds to the DC current signal from the frequency meter of the speed governor.
Idc_fq_Berta_echo	Signal input in AD13 (channel 12)in volts. The echoed signal from Berta.
Ad14	AD14, channel 13. In volts
Vdc_fq_Berta_echo	AD15, channel 14. In volts
Vdc_fq_fm_plant	Signal input in AD16 (channel 15) in volts. Corresponds to the DC voltage signal from the frequency meter of the speed governor
Va RM	RMS voltage, phase A, in p.u.
Vb RMS	RMS voltage, phase B, in p.u.
Vc RMS	RMS voltage, phase C, in p.u.
Vab RMS	RMS voltage, ph-ph AB, in p.u.
Vbc RMS	RMS voltage, ph-ph BC, in p.u.
Vca RMS	RMS voltage, ph-ph CA, in p.u.
Ia RMS	RMS current, phase A, in p.u.
Ib RMS	RMS current, phase B, in p.u.
Ic RMS	RMS current, phase C, in p.u.
Speed dev virtual grid	Speed deviation of the tested unit modeled in the virtual grid
Elec power virtual grid	Electrical power of the tested unit modeled in the virtual grid
Mec Power virtual grid	The mechanical power of the tested unit modeled in the virtual grid

Signals from Acquisition Time

Acq Time	Elapsed time since the start of the acquisition

Signals from Islanded Grid

Total Pm MW	Total mechanical power of the tested unit and the simulated units in the island. In MW.
Total Pe MW	Total electrical power of the tested unit and the simulated units in the island. In MW.
Total Island Pm MW	Total mechanical power of the simulated units in the island. In MW
Total Hydro MW	Total mechanical power from the simulated hydraulic turbines. In MW.
Total Thermal MW	Total mechanical power from the simulated thermal turbines. In MW.
Total Gas MW	Total mechanical power from the simulated gas turbines. In MW.
Total Load MW	Total load in MW, after sheddings and deviations due to frequency.
Shedded Load MW	Total shedded load in MW.

Mechanical Power Signals from Individual Units in MW

Hydro 1 Pm MW	The mechanical power of hydro unit 1 in MW.
Hydro 2 Pm MW	The mechanical power of hydro unit 2 in MW.
Hydro 3 Pm MW	The mechanical power of hydro unit 3 in MW.
Hydro 4 Pm MW	The mechanical power of hydro unit 4 in MW.
Hydro 5 Pm MW	The mechanical power of hydro unit 5 in MW.
Thermal 1 Pm MW	The mechanical power of thermal unit 1 in MW.
Thermal 2 Pm MW	The mechanical power of thermal unit 2 in MW.
Thermal 3 Pm MW	The mechanical power of thermal unit 3 in MW.
Thermal 4 Pm MW	The mechanical power of thermal unit 4 in MW.
Thermal 5 Pm MW	The mechanical power of thermal unit 5 in MW.
Gas 1 Pm MW	The mechanical power of gas unit 1 in MW.
Gas 2 Pm MW	The mechanical power of gas unit 2 in MW.
Gas 3 Pm MW	The mechanical power of gas unit 3 in MW.
Gas 4 Pm MW	The mechanical power of gas unit 4 in MW.
Gas 5 Pm MW	The mechanical power of gas unit 5 in MW.
Tested Unit MW	The mechanical power of the tested unit in MW.

Signals from Servomotor Strokes from Individual Units in P.U.

Hydro 1 Gate	Gate servomotor stroke of hydro unit 1 in p.u.
Hydro 2 Gate	Gate servomotor stroke of hydro unit 2 in p.u.
Hydro 3 Gate	Gate servomotor stroke of hydro unit 3 in p.u.
Hydro 4 Gate	Gate servomotor stroke of hydro unit 4 in p.u.
Hydro 5 Gate	Gate servomotor stroke of hydro unit 5 in p.u.
Thermal 1 Valve	Valve position of thermal unit 1 in p.u.
Thermal 2 Valve	Valve position of thermal unit 2 in p.u.
Thermal 3 Valve	Valve position of thermal unit 3 in p.u.
Thermal 4 Valve	Valve position of thermal unit 4 in p.u.
Thermal 5 Valve	Valve position of thermal unit 5 in p.u.
Gas 1 Valve	Valve position of gas unit 1 in p.u.
Gas 2 Valve	Valve position of gas unit 2 in p.u.
Gas 3 Valve	Valve position of gas unit 3 in p.u.
Gas 4 Valve	Valve position of gas unit 4 in p.u.
Gas 5 Valve	Valve position of gas unit 5 in p.u.

Signals from Behavior of Individual Loads in MW

Load 1 MW	Load value of load 1 in MW.
Load 2 MW	Load value of load 2 in MW.
Load 3 MW	Load value of load 3 in MW.
Load 4 MW	Load value of load 4 in MW.
Load 5 MW	Load value of load 5 in MW.

Signals from Shedded Loads

Load 1 Shedded MW	Shedded load of load 1 in MW.
Load 2 Shedded MW	Shedded load of load 2 in MW.
Load 3 Shedded MW	Shedded load of load 3 in MW.
Load 4 Shedded MW	Shedded load of load 4 in MW.
Load 5 Shedded MW	Shedded load of load 5 in MW.

Status of Signals from Individual Loads (0= Not Shedded; 1= Shedded)

Load 1 Shedding Status	Shedding status for load 1.
Load 2 Shedding Status	Shedding status for load 2.
Load 3 Shedding Status	Shedding status for load 3.
Load 4 Shedding Status	Shedding status for load 4.
Load 5 Shedding Status	Shedding status for load 5.

Specialized Solutions Documentation

BERTA Acquisition Group 2