The appointment of a static exciter EX-SR
The exciters of the EX-SR series, manufactured by Energocomplekt JSC, are designed to supply the excitation windings of synchronous motors and compensators with automatically controlled current in all operating modes.
The exciters of the EX-SR series can be used to replace static exciters with analog control of the TE8, BTU, BVU, TV, TV2, TPE10, TPE series, as well as in the modernization of engines and compensators with electric excitation systems. At the same time, the implementation of the required functions of management and regulation of excitation is carried out programmatically.
A number of nominal values of exciter currents according to GOST 24688-81 (200, 250, 315, 400, 500, 630, 800, 1000 A, etc.).
A number of nominal values of exciter stresses according to GOST 24688-81 (36, 48, 60, 75, 115, 150, 230, 300, 345, 460, 600 V).
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EX-SR exciter
Composition of the exciter
The static exciter EX-SR includes the following devices:
- automatic switch;
- controlled thyristor rectifier;
- launch resistance;
- thyristor discharger with control unit;
- microprocessor control module;
- operator's remote;
- matching converters of current and stator voltage signals;
- trigger-chain current sensor;
- matching relay block;
- devices indicating the state of the exciter;
- exciter control systems.
The microprocessor control module of the exciter is based on the ADSP-2181 signal processor and the ST10F168 microcontroller. The signal processor performs the basic control and regulation program, and the microcontroller exchanges information with the signal processor and control panel, as well as performs service programs.
Structurally, the equipment of the exciter is located in the execution cabinet IP23 (IP54, IP44) GOST 14254, equipped with a fan. The measurement, control and indication organs are located on the cabinet door. Power chains of control of the exciter from the network of own needs.
The exciters are designed for prolonged work in a closed room under the following conditions:
- height above sea level up to 1000 m; at altitudes above these, the permissible current decreases by 1.2 % for every 100 m of added height;
- ambient temperature 0 - 45 ° C, at temperatures above 40 ° C, the reduction in permissible current is 1.25% for every 1 ° C above 40 ° C;
- влажность воздуха от 5 % до 85 %, от 1 г/м? до 25 г/м? без конденсации влаги или обледенения (3К3 класс по EN 50178);
- air pressure from 86 kPa to 106 kPa (3K3 class according to EN 50178);
Functionality
The exciter ensures:
- direct, reactor, from a soft starter and frequency start-up of a synchronous motor with automatic excitation in the frequency and phase functions of the induced rotor current;
- forcing of excitation with a multiplicity of at least 1.4 rated excitation current at a reduced to 0.8 rated voltage of supply of the exciter or 1.75 rated voltage of the exciter at a nominal voltage of supply of the exciter;
- limit the duration of forcing and the minimum duration between two subsequent forcings;
- limiting the excitation current to a minimum;
- limiting the excitation current when forcing a value of 1.4 nominal;
- forced field suppression of the rotor when the motor is disconnected, engine power interruptions and in the presence of an additional signal for field suppression;
- disconnection of the engine from the network with a customizable time exposure after the disappearance of the logical supply of the exciter.
When operating in automatic mode, the exciter, in addition to the previously listed functions, provides automatic regulation of:
- stator voltage;
- jet current of the stator;
- cos?.
It provides a non-impact transition from automatic control mode to manual and vice versa. In manual mode, the exciter provides stabilization of the excitation current with the possibility of regulation within 0-1.2 nominal in accordance with the operator's task. The choice between manual and automatic operating modes is made by the operator. Algorithms of work and laws of regulation are implemented in a software way.
From the operator’s remote, it is possible to change the structure and control parameters, monitor the parameters of the engine and exciter, view an archive of 50 events. It is possible to communicate the exciter control system through a serial interface RS485, ModBus RTU or ProfiBus DP with the object's ACSMS for remote monitoring.
By additional order, the function of temperature control of steel and copper stator, engine bearings, cooling air and cooling water is implemented.
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. Supply of excitation systems equipment is carried out within 3 months from the date of conclusion of the contract and prepayment.