1.3 function configurationFunction configuration of SAI3880D digital generator differential protection deviceDifferential quick break, ratio brake differential, CT disconnection locking differential, CT disconnection alarm, stator overvoltage protection, stator ground fault protection, overload alarm, anti time overcurrent protectionFunction configuration of backup protection device for SAI3881D digital generatorTransverse differential protection, loss of excitation protection, rotor one point grounding protection, rotor two points grounding protection composite voltage over current protection, inverse time negative sequence overcurrent protection, Pt disconnection alarm, non electricity protection (generator water shutoff, and the generator thermal, generator excitation accident, main steam valve closed),
The rotor low voltage action criterion equation is：
Kf×Vfd/125 < (P-Pt)/866
3.5 Over load protection
Generator stator winding protective reaction of load generator stator winding overload or fault caused by overcurrent caused overheating winding, discrimination protection generator winding B phase current size, when the current is higher than setting value when the delay send alarm **.
3.6 compound voltage over current protection
Generator compound voltage over-current protection is as a generator of symmetric and asymmetric short-circuit fault back-up protection, protection discriminant generator three-phase current, AC phase voltage and negative sequence voltage, when any phase current is greater than the fixed value, and AC phase voltage less than fixed value or negative sequence voltage is greater than the fixed value export protection settings have two period of time delay, a movement in solution column or splitting demagnetization, off action to stop, protection can choose to take the current memory function.
3.7 inverse time overcurrent protection
Generator anti time limit over current protection of the generator stator winding current size, the protection of the winding due to the current too large and lead to the stator winding overheating, the protection of the three-phase current size of the judge, from three parts:
device overview
SAI3880D series digital generator protection device with high performance chip supports universal hardware platform, easy to maintain; the Ethernet communication, high-speed data transmission and reliable. Complete localization of Chinese display technology, simple operation.
Based on waterproof, dust, anti vibration design, can be run in a variety of field conditions.
Suitable for capacity of 50MW and below the fire and hydro generator protection.
1.2 main features of the device
An Motorola 32 bit microcontroller technology, the stability and speed of products is guaranteed
The protection. The 14 bit a / D converter, optional measurement module dedicated to the A / D conversion accuracy is up to 24 bits and the measurement indicators easily reach
The purpose of configuration with high capacity RAM and Flash Memory, can record 8 to 50 recorded reports, record the number of events is not less than 1000
An independent tuning of 32 sets of protection setting value, safe and convenient switch
In high precision clock chip, and equipped with GPS hardware circuit for the whole time, system clock synchronization
It is equipped with high speed Ethernet communication interface, and the integration of IEC870-5-103 standard communication protocol
In the electrical design with the machine, no adjustable device
In high grade, quality assurance component selection
An excellent anti-interference performance, panel or installed in the switch cabinet without other anti-jamming module
The purpose of self diagnosis function perfect
The chassis design of waterproof and dustproof and anti vibration.
The purpose of debugging conceptual design
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