generator protection panel mainly formed by the 9698（Generator differential protection relay）、the 9688（Generator backup protection relay）、the 9689（Generator grounding protection relay）And some switching elements,Cabinet,The protection of the generator protection screen set protection, measurement, communication in one, come true the function of unattended.The product is mainly suitable for medium and small hydropower stations and thermal power station projects,It is mainly used for the control and protection of water turbine generator and turbine generator set.
Composition of the generator protection screen
Composed by the 9698（Generator differential protection relay）、the 9688（Generator backup protection relay）、the 9689（Generator grounding protection relay）、air switch、switch valve 、thunder preventer for power source 、thunder preventer for communication、accessory of the screen body and such element,Body size is 2260*800*600.mainly applied to the water turbine capacity whose power is not more than 10MW and the turbine generator capacity that does not exceed 100MW of the generator protection.if large capacity of the generator protection relay is needed, please call us .
Protection function of generator protection panel
Differential current instantaneous trip protection
Proportional differential protection（With two harmonic brake, CT line-break block）；
compound voltage lockout overcurrent protection;
Negative sequence overcurrent protection;
Over load
Zero sequence overcurrent;
overvoltage
Low voltage;
overfrequency
Low frequency
reverse-power protection
Loss of magnetic protection
stator ground fault protection
Rotor one point grounding
Rotor two point grounding;
Non electricity protection
Specific protection functions and protection principle and access can be looked for their respective protection devices.
Communication mode
485communication
Ethernet communication
Optical fiber communication
The features of generator protection screen
1、the cubicle use the size of 2260（or 2360）×800×600 ,Each side panel can be fitted with 3 layers, and each layer can be fitted with 3 devices.The protection and monitoring device and automatic control devices from the physical properties and spatial distribution to the main substation equipment layer, the device as a complete system, with independent power supply, CPU and independent operation circuit, complete the corresponding interval of plant protection, measurement, control and other functions, the device that in soft, hardware design is completely independent and does not rely on communication network.
2、the measurement and control device of CPU chip using the advanced DSP chip, and take the isolation, software and hardware filter, watch dog circuit, anti-interference encoding, intelligent diagnosis, opening and locking control circuit, anti vibration, measures of anti interference model structure design and so on. many kinds of hardware and software and improve the reliability of the device.
3、In the communication system, the device can directly connected to a microcomputer communication through the field bus, also can communicate with the communication management machine, collected all kinds of information transmitted via the communication management machine to the microcomputer monitoring system; at the same time communication management machine received various commands and transmitted to the corresponding device. Control device layer the station a device as the control object, object oriented, comprehensive analysis of substation of information collection, processing and control requirements, distributed configuration of miniaturization, high reliability of the microcomputer protection and measurement and control device. The device is relatively independent, and substation layer communication equipment, implementation of substation integrated automation.
4、Protective screen in the design of the generator is not protected, while protecting the excitation transformer,ensured the reliable operation of the unit, greatly reduced the probability of burning down the generator, providing a powerful guarantee for long-term safe operation.
5、Protective screen offers a variety of communications and GPS time synchronization port, lead terminal, convenient and power system background communication,which achieved the power system computer background of the generator telemetry, remote control, remote communication, remote adjustment, realize the active, reactive power, current, voltage, frequency and power factor and supply parameters acquisition.
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