Purpose of the excitation control cabinet SHUV-1K
The microprocessor automatic excitation system SHUV-1K manufactured by Energocomplekt JSC is designed to supply automatically controlled current to the excitation windings of brushless turbine generator exciters and hydro generators with a capacity of 1.5 to 12 MW in all operating modes.
The microprocessor regulator AVR is installed in SHUV-1K and performs all the functions of control, protection and alarm about the state of the excitation system.
The SHUV-1K can also be used to complete the excitation systems of other series and types of generators, as well as in the reconstruction of electric, high-frequency and brushless excitation systems of generators, which have control and regulation equipment made on the basis of EPA panels, RVA-62 regulators, ShDE-76 control stations, ARV-R devices, etc.
The automatic excitation regulator AVR has been tested on the electrodynamic model of OJSC "NIIPT" (St. Petersburg) and has an expert opinion on the possibility of using generators of any power.
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Appearance of automatic excitation regulator, cabinet design, 1 channel without reserve
The regulator provides
- operation of generators in modes:
- initial excitement,
- idle,
- inclusion in the network by methods of accurate synchronization and self-synchronization,
- network operation or autonomous load; - local or remote change of voltage setting at a rate of 0.5% per second in the range from 80 to 110%, relative to the nominal voltage of the generator;
- maintaining the voltage of the generator set by the installation with an accuracy of not less than 1% relative to the established static characteristic;
- independence of voltage at the outputs of the generator in idling mode when the frequency changes from 47 to 52 Hz;
- forcing the excitation current to the maximum multiplicity values during disturbances that caused a decrease in voltage at the outputs of the generator by 10-20% or more;
- automatic restriction of the excitation current when a two-fold value of the generator rotor current is reached;
- limiting the excitation current of the exciter by time-dependent characteristic in accordance with the data on generator overload;
- field suppression (excitation) of the generator by field suppression of the brushless exciter;
- programmatic initial excitation;
- stable regulation of the generator excitation current under abruptly variable loads, up to individual load discharges caused by the simultaneous inclusion of asynchronous motors with a total power of up to 30% of the rated power of the generator;
- limiting the minimum excitation current to a value that does not allow the generator to enter the deep reactive power consumption mode;
- stable distribution of reactive power without the use of group regulation or cross-leveling links between several simultaneously switched on at the level of generator voltage, the same type of generators of comparable power;
- unloading the generator on reactive power and disconnecting it from the network.
Composition
The brushless excitation system includes a brushless exciter installed on the shaft of the generator, a regulator and a transformer connected to the clamps of the generator stator. The regulator is a structurally completed unit, which includes: the power section and the control section. The general view of the regulator is given in Fig.1. Under operating conditions, the regulator unit can be placed in a separate cabinet or in one of the panels of the generator control shield.
Basic technical data
| Name of the parameter | Meaning |
| Nominal rectified current, A | 4 - 100 |
| Nominal rectified voltage, B | 36 - 250 |
| Multiplicity of forcing by the excitation current of the exciter, o.e., at least | 3 |
| Duration of overload at double current, with | 60 |
| Nominal power supply voltage of the power module, not more, B | 440 |
| Power module voltage frequency, Hz | 25-100 |
| Power supply voltage of control equipment, B | = 120 - 375 |
| Power consumption of power control equipment for food, W, no more | 100 |
| Nominal voltage of stator voltage measurement circuits, B | 105 |
| Power consumption from measuring current and voltage transformers per phase, VA, no more | 2 |
The company performs supervision installation, adjustment and testing of excitation systems, warranty and post-warranty maintenance, modernization and repair of excitation systems of machines in operation, training of service personnel, technical consultations on the choice of excitation systems equipment. Delivery of equipment is carried out within 3 months from the date of conclusion of the contract and prepayment.