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AVR AUTOMATIC FIELD CONTROL FOR CAGE SYNCHRONOUS BRUSHLESS GENERATORS
APPLICATION
AVR-ХХ-BR-Q1Х microprocessor automatic excitement control produced by CC “Energocomplekt” is designed for power supply by automatically adjustable current of field winding of brushless exciter of type GSB, GSD cage synchronous generator for diesel motors up to 3 MW in all its operational modes. The control also carries out functions of control, protection and signaling about the field system condition. AVR controls can also be used for a completing field systems of generators of other series and types, and also for reconstruction of electric machine, high-frequency and brushless field systems of generators incorporating control and regulation equipment realized on the basis of EPA panels, RBA-62 controls, SDE-76 control stations, ARV-R devices, etc.
STRUCTURE OF SYMBOLS
| AVR |
-XX |
-BR |
-Q1X |
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М-modernized |
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for brushless field systems |
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nominal current, А |
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Automatic field control |
The control is produced in UHL climatic modification, accommodation category 4 in accordance with GOST 15150 and GOST 15543 with the following influencing factors:
- ambient temperature from +1 up to +40 0С;
- height above sea level up to 3000 m;
- relative humidity not more than 80% at temperature +25 0С;
- environment: non-explosive, not containing current-conducting dust in concentration reducing insulation level to impermissible limits.
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| Fig. 1. AVR-8-BR-Q1М automatic field control for GSB-1800-6,3-1500UHL2 diesel motor. |
OPERATING MODES
Automatic field control provides:
local or remote change of voltage setting with the speed of 0.5 % per second in the range from 80 up to 110% with relation to the generator nominal voltage;
maintenance of voltage set by the device on the generator outputs with accuracy not worse than 1% with relation to the established static characteristic. Thereby static regulation value on the reactive current can be established in the range from 0 to 10%;
independence of voltage on the generator outputs in the idling mode in case of frequency change from 47 to 52 Hz;
forcing field current up to the preset values on the frequency rate at reduction of voltage on the generator outputs by 10-20% and more;
limiting field current on the double value of the generator rotor current;
limiting the duration of the generator field forcing depending on its frequency rate;
clearing (unexciting) the generator field by clearing the brushless exciter field;
program initial field;
steady regulation of the generator field current at fast alternating loadings, up to single load surges, caused by simultaneous switch-on of cage synchronous motors with total capacity up to 30% of the nominal generator power;
limiting the minimal field current to the value not allowing the generator switch to the mode of reactive capacity deep consumption;
steady distribution of reactive capacity without use of group regulation or cross leveling connections between several generators of comparable capacity, switched on in parallel on the generating voltage level;
There is also a possibility of outputting through dry isolated contacts the following signals about the condition of the control and the activator:
automatic mode of the control operation;
manual mode of the control operation;
field system failure (breakdown of the rotating rectifier diode, breakdown of the control power transistor, field loss, increased voltage on the stator outputs).
failure signal is also output to the power station circuit.
Note: Permissible current through the relay contacts is 0.7 А at the direct current voltage 250 V.
BASIC SPECIFICATIONS
| Name of the parameter |
Value |
| Nominal rectified current, A |
6.3 - 8 |
| Nominal rectified voltage, V |
75 |
| Maximum rectified voltage, V |
180 |
| Forcing ratio on field current and voltage, r.u., not less than |
2.4 |
| Overload duration by two-times current, sec |
60 |
| Nominal voltage of alternating current circuits (from additional winding), V |
190 |
| Permissible variation range for voltage of alternating current circuits, V |
85…265 |
| Permissible variation range for voltage frequency of alternating current circuits, Hz |
25 - 440 |
| Nominal power supply voltage of alternating current circuits (from a storage battery), V |
24 |
| Permissible variation range for voltage of direct current circuits, V |
18…36 |
| Permissible voltage ripple level for direct current circuits, % |
20 |
Power consumption on alternating current circuits, W, not more than
in nominal mode
in forcing mode |
450
3000 |
| Power consumption on direct current circuits, W, not more than |
30 |
| Nominal voltage on circuits of the stator voltage measurement, V |
105 |
| Nominal current on circuits of the stator current measurement, A |
5 |
| Power consumption from current and voltage measuring transformers, per phase, VA, not more than |
1 |
The company carries out installation supervision, adjustment and testing of field systems, warranty and post-warranty service, modernization and repair of motor field systems in operation, maintenance personnel training and technical advisory services on equipment selection. Field systems equipment is delivered within 3 months from the date of contract execution and prepayment.
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Энергокомплект, Высоковольтный частотный привод, ЧРП, вчрп, стотный привод, чрп, Высоковольтный плавный пуск, Возбудители серии EX-SR, впп, бесщёточная система возбуждения, преобразователь частоты, для высоковольтных асинхронных и синхронных двигателей, ВПП, плавный пуск, Системы возбуждения теристорные, системы возбуждения. устройства управления стартер-генератором, для беcщеточных дизель-генераторов и двигателей, автоматический регулятор возбуждения, статические тиристорные системы возбуждения, высоковольтный частотный привод, бесщёточная система возбуждени, устройство плавного пуска, рекуперация паров, система очистки воздуха, наливная эстакада, нефтеналивка, автоматического регулятора возбуждения, системы управления, EX-SR, Система автоматического управления дизель-генератором СУДГ, допустимые нормы, устройство плавного пуска, УРП, АУТН, тактовый налив нефти, тепловая электростанция. технологический пар, асинхронных электродвигателей, устройства управления стартер-генератором |
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