1.1 Scope of Application

The WFB-800 series microcomputer generator transformer combination protection device is mainly suitable for the protection of main equipment in power systems. The WFB-801 device integrates all electrical quantity protections for a generator, the WFB-802 device integrates all electrical quantity protections for a main transformer, the WFB-803 device integrates all electrical quantity protections for a high voltage transformer and excitation transformer (exciter), and the WFB-804 device integrates all non electrical quantity protections for a main transformer and high voltage transformer. It can meet the configuration requirements of dual sets of main protection, dual sets of backup protection, and completely independent non electricity protection for large generator transformer units. At the same time, this series of protections can also be directly connected to the integrated automation system of the power plant.

1.2 Functional Features

High performance hardware

Adopting a 32-bit high-performance DSP processor, 32-bit logic processor, and 16 bit high-speed serial port AD; with complete separation of strong and weak electricity, it has a high self checking function to ensure high hardware reliability.

Real time multitasking operation platform

Adopting Nucleus Plus' real-time multitasking operating system to ensure the stability of software operation.

The running mode and export mode of the CPU

Three CPUs parallel intelligent processing technology to avoid component damage causing misoperation. One CPU is responsible for communication, and the protection of the exit adopts the "start+exit" method. One CPU is responsible for protecting the start and signaling, and one CPU is responsible for protecting the exit.

Powerful communication capabilities

Information and messages can be uploaded, and the recorded data is compatible with COMTRADE format; The communication interface has strong compatibility and openness, and supports the IEC60870-5-103 communication protocol.

Principle of dual primary and dual backup protection configuration

Can meet the protection configuration requirements of dual master and dual rear;

Non electric quantity protection is independent of electrical quantity protection and meets the relevant requirements of "countermeasures".

Online modification of trip mode

Users can set the tripping mode after each protection action themselves, without the need to modify the wiring of the protection secondary circuit; The tripping contact can be directly connected to the circuit breaker tripping circuit.

Reliable differential circuit TA disconnection discrimination function

Be able to correctly determine TA single-phase and two-phase disconnection, and lock differential protection according to user needs.

L Friendly human-machine interface

Large screen, graphical, Chinese, color LCD, and can also be operated through a PC.

Provide waveform recording function and comprehensive waveform analysis software

The protective device can record waveforms for 4 cycles before the action and 6 cycles after the action;

Data information can be printed on-site or through network printers for easy fault analysis after accidents;

Provide offline waveform analysis software that can reproduce the trend of fault development.

Complete event recording function

The protection action report, switch displacement, self-test results, constant value changes, and waveform recording data are all recorded and can be printed in real-time or summoned for printing.

Eight fixed value zones can be switched, and the fixed values in each zone can be copied from each other.

1.3 Scope of adaptation of the device

This device can adapt to various wiring requirements of the generator transformer group (note: all TA's secondary wiring is connected in a "Y" shape).