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AVR AUTOMATIC FIELD CONTROL FOR CAGE SYNCHRONOUS BRUSHLESS MOTORS
APPLICATION
AVR-ХХ-BR-QХD microprocessor automatic field control, produced by CC “Energocomplekt”, is designed for power supply by automatically adjustable current of field windings of a cage synchronous motor brushless exciter in all its operational modes. The control also carries out functions of control, protection and signaling about the field system condition.
STRUCTURE OF SYMBOLS
| AVR |
-XX |
-BR |
-QX |
-D |
-() |
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type of climatic modification |
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for motors |
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for brushless field systems |
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nominal current, A |
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Capacity, MW |
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automatic field control |
AVR controls of a cabinet dedign, the notation for field control cabinet (“ECC cabinet”) is used.
| PWM |
-XK |
-XX |
-XX |
-D |
-() |
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type of climatic modification |
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for motors |
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nominal voltage, V |
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nominal current, A |
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number of converting-regulating channels |
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field control cabinet |
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-Q1D automatic field control for cage synchronous motors. |
OPERATING MODES
Field automatic control provides:
field automatic supply in sliding function at the cage synchronous motor start-up;
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 nominal voltage or reactive capacity;
maintenance of voltage set by the device on the stator outputs with accuracy not worse than 1% (with relation to the established static characteristic) or reactive capacity with accuracy not worse than 5%;
forcing field current up to the preset values on the frequency rate at reduction of voltage on the stator outputs by 10-20% and more;
limiting field current on the double value of the rotor current;
limiting the duration of field forcing depending on its frequency rate;
clearing (unexciting) the motor field by clearing the brushless exciter field;
limiting the minimal field current to the value not allowing the motor switch to the mode of reactive capacity deep consumption and falling out of synchronization;
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).
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 |
8 |
| Nominal rectified voltage, V |
75 |
| Maximum rectified voltage, V |
180 |
| Overload duration by two-times current, sec |
60 |
| Nominal voltage of alternating current circuits (from additional winding), V |
110…230 |
| Nominal voltage of alternating current circuits, V |
220 |
Power consumption on alternating current circuits, W, not more than, in nominal mode
in forcing mode |
450
3000 |
| Nominal voltage on circuits of the stator voltage measurement, V |
100 |
| 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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