The Generator Protection Relay Application, "AEL-GPRE", has been designed by Edibon for the training at both the theoretical and practical levels in the field of high power generators with control and protection systems.
This application presents several levels of training to give the user full knowledge and experiences about the operation of advanced protection systems used in large power plants with electrical generators: a specific manual in which are theoretically studied all aspects related to electrical generators such as types of electrical generators, basic principles of generators operation, control and stand-alone generator operation, parallel generator operation with the national grid, types of protections used to protect these machines, sizing and protection relay settings. On the other hand, they are provided a series of modules for putting students’ acquired knowledge into practice.
The AEL-GPRE application includes a series of modules that make it leadership in the market:
- The Generator Protection and Control Relay Unit:
It is an industrial control and protection device of power generator groups with more than 150 configurable variables. The Relay Unit allows the user different access levels for the relay configuration. For example, the user can adjust the protection thresholds of overcurrent (50/51), over/under-voltage, over/under-frequency (81), inverse power, over/under-speed of the turbine (12), number of poles of the machine, nominal power, etc. In addition, for more advanced settings, it is possible to set the PID control system parameters under different operation conditions of the turbine-generator group. For example, when the generator is working in stand-alone or in parallel modes are used different PIDs. During commissioning of generator the provided software allows monitoring voltage and frequency PID signals, perturbations, analysis and real time settings.
Due to the versatility of the Generator Protection and Control Relay Unit, Edibon provides configured this device to work properly from scratch with the generator-motor group. In addition, it is provided a relay setting file to restore the relay to the initial configuration. On this way, the user can change any relay parameter and recovery the initial setting.
- Turbine Speed Controller:
The application includes an advanced speed controller that can be controlled manually or automatically. After manual control is selected, the user can control the turbine speed through a potentiometer provided in this module. If the user selects automatic control mode, the Generator Protection and Control Relay will control the turbine with an analog signal of 0-10V. On this way, the user can study the operation of the complete system working autonomously, as a real power station works, or he can take the control of the installation to study the effects of the speed change of the turbine in the electrical system.
- Automatic voltage regulator:
This device is designed for manual and automatic control of the current excitation of the synchronous generator. The regulator has a switch that allows the user to select the control mode. If manual control mode is selected, the current excitation of the synchronous generator can be controlled manually with a potentiometer and the effects of the generator output voltage can be seen. Automatic control mode allows the Generator Protection and Control Relay Unit to take the control of the current excitation. On this way, the user can study the operation of the complete system working autonomously, as a real power station works, or he can take the control of the installation to study the effects of the excitation change of the synchronous generator in the electrical system.
- Faults simulation module:
This module allows injecting real short circuits in the electrical generator to study the effects of these short circuits in the machine. Thus can be analyzed the response of the Generator Protection and Control Relay. The faults module has a selector, which allows the user to configure previously the kind of the fault to be injected: three-pole, two-pole, two-pole to ground and single-pole short circuits. All these faults can be configured with and without fault impedance. Finally, this module has a push-button to inject the fault.
- Network Analyzer Unit with Data Acquisition:
This device allows measuring all electrical parameters of the synchronous generator such as phase and line voltages, line currents, active, reactive and apparent powers, frequency, harmonics, etc.
- Three-Phase bank of Commutable Resistors Module:
This module is designed in order to carry out local consumption of the generated energy by the synchronous generator.
A number of optional modules are available for the application:
Differential protection relay module: this device allows protecting the generator against differential internal electrical faults.
Rotor earth-fault protection module.
Generator-Motor Group + Generator Protection and Control Relay Unit: they are additional equipment, which are required to couple several parallel generators to study load sharing, electrical service restoration after a black-out, etc.