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The Regulators


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Voltage and current rates Audit for stabilizers and regulators E-xx-xx developed by ERAM spol. s r.o.

(BUREAU OF ENTERPRISE OWNERSHIP AND PATENTS CERTIFICATE 2005-16999 / MPI G 05 B 15/02, G 05 B 11/06 )
final report - VŠB Ostrava


Picture #1 -  Block connection of monitoring aparature for the case of asynchronous engine connected via stabilizer

 
There were monitored input and output voltage/current rates of stabilizer E-SS-66 set with following parameters:
  • 3x200 A, 132 kVA, 3x400V set to stabilizer mode
  • 3x100 A, 66 kVA, 3x400V  set to regulator mode powered from switchboard 3x400V, 50Hz frequency

Stabilizer/regulator powers up the asynchronous engine with the core "in short circuit" (nominal wattage 7,5kW, nominal speed 2900 rpm, nominal current 15,1A, nominal voltage 400V, 0,72 power factor)

The asynchronous engine (AM) is decelerated by asynchronous engine (AM2) with nominal wattage 55kW, nominal speed 732 rpm, nominal current 116A, nominal voltage 400V, 0,68 power factor. The decelerating engine AM2 is cooled with the fan-cooler with the nominal wattage 2,2kW, current 5,3A, voltage 5,3A and 0,599 power factor.

Monitoring devices:
A1, A2 ampermeter MuL10, TP1
U1, U2 voltmeter FL21, TP 0,2,
P1, P2 wattmeter METRA, TP 0,5.
Osciloscope Yokogawa, 16 bit , 8 channels
current monitoring: current transformer C160, 100A/x10, TP 0,5.
The engine speed was detected using the data collector ADASH  

The monitoring was realized in the one-phase mode for two working states - at the first case using the asynchronous engine power connection via stabilizer and regulator (recording the voltage/current rates measured on the input and output of stabilizer and regulator, the current value detection on the stator winding in the decelerating asynchronous engine AM2) and at the second case using direct engine power connection from the switchboard 3x400V, 50Hz (recording the voltage/current rates on the connectors of asynchronous engine AM, the current value detection on the stator winding of decelerating asynchronous engine AM2.

Note.: If there is not written another way, all measured entities are in effective values.
 

The monitoring results

The situation - asynchronous engine is powered directly from the switchboard

Tab. 1 The values recorded using the analog monitoring devices:

monitoring cycle ID U1 (V) I1 (A) I1è (A) I1j (A) S1 (VA) P1 (W) Q1 (VAr) cosφ1 (-) n (min-1) I3 (A)
1 231,80 15,52 12,25 9,53 3598 2840 2208 0,789 2620 72
2 231,80 13,72 11,22 7,90 3180 2600 1831 0,818 2610 71

Tab. 2 The values recorded using the osciloscope:

monitoring cycle ID U1 (V) I1 (A) I1è (A) I1j (A) S1 (VA) P1 (W) Q1 (VAr) cosφ1 (-) n (min-1) I3 (A)
1 222,10 15,44 11,27 10,55 3430 2500 2348 0,730 2620 76,29
2 221,73 14,65 11,00 9,67 3250 2440 2147 0,751 2610 75,10

 


Picture #2 - The  output values curves recorded via osciloscope recording (Monitoring cycle #1, Table #2)


Picture #3 - The  output values curves recorded via osciloscope recording (Monitoring cycle #2, Table #2)
 
 

The situation - asynchronous engine is powered from the switchboard using the stabilizer/regulator

Tab. 3 The input values recorded using the analog monitoring devices:

monitoring cycle ID U1 (V) I1 (A) I1è (A) I1j (A) S1 (VA) P1 (W) Q1 (VAr) cosφ1 (-)
3 233,30 13,40 11,66 6,61 3126 2720 1541 0,870
4 233,30 7,24 7,20 0,75 1689 1680 175 0,995
5 213,70 17,80 15,16 9,33 3804 3240 1993 0,852

Tab. 4 The input values recorded using the osciloscope: 

monitoring cycle ID U1 (V) I1 (A) I1è (A) I1j (A) S1 (VA) P1 (W) Q1 (VAr) cosφ1 (-)
3 226,28 13,19 12,07 5,32 2980 2730 1195 0,915
4 225,91 7,46 7,43 0,67 1690 1680 184

0,996
5 225,19 18,01 14,44 10,76 4060 3250 2433 0,802

Tab. 5 The output values recorded using the analog monitoring devices: 

monitoring cycle ID U2 (V) I2 (A) I2è (A) I2j (A) S2 (VA) P2 (W) Q1 (VAr) cosφ2 (-) n (min-1) I3 (A)
3 227,90 15,56 11,94 9,98 3546 2720 2275 0,767 2540 68
4 228,10 10,60 7,37 7,62 2418 1680 1739 0,695 2797 65,4
5 226,60 19,20 14,30 12,81 4351 3240 2904 0,745 2068 72

Tab. 6 The output values recorded using the osciloscope: 

monitoring cycle ID U2 (V) I2 (A) I2è (A) I2j (A) S2 (VA) P2 (W) Q1 (VAr) cosφ2 (-) n (min-1) I3 (A)
3 218,08 15,05 11,18 10,07 3280 2440 2192 0,743 2540 66,01
4 218,10 8,47 7,12 4,58 1850 1550 1010 0,841 2797 65,57
5 217,48 20,47 12,96 15,85 4450 2820 3442 0,633 2068 65,25

 



Picture #4 - The input and  output values curves of stabilizer recorded via osciloscope recording (Monitoring cycle #3, Tables #4,6)
 

Picture #5 - The input and  output values curves of stabilizer recorded via osciloscope recording (Monitoring cycle #4, Tables #4,6)

Picture #6 - The input and  output values curves of stabilizer recorded via osciloscope recording (Monitoring cycle #5, Tables #4,6)

Picture #7 - Transient process in the switching of circuit - very good characteristic.


Summary

The elementar analysis demonstrates the regulator functionality within the darking phase, where is confimed the voltage regulation based on the circuit switching is functional with the length of transient process by switching in microseconds  for the voltage increasing and decreasing . Transient process related to circuit switching is shown on the Picture #7.

There is possibility to achieve the savings of energy regarding the engines under the charge of moment less than the nominal (for value near the 60% is able to achieve the highest impact to effectivity - 10% max) using the decresaing power voltage to certain value.

The regulator seems to be really highly economical device usable for the public lightning systems or lightning in the factories, hypermarkets, warehouses etc, where is able to decrease the voltage value and complete wattage with saving till 50%.
The regulator is able to produce voltage from 165V till 260V with the step of regulation 2V or 5V

From the engines point of view there is positive result for engines they are working under the lower charge (form 50% till 70%) and the regulation can assure the savings nearby 10%
The regulator is able to produce voltage from 170V till 260V with the step of regulation 2V

The regulator in-the-test shows the compensation effect, that means the effectivity grows up from the starting value 0,743 to the final value 0,915 for Monitoring cycle #3 - tab #4 and tab #6.