WXH-801A_Xuji microcomputer line protection device

1. Overview

1.1 Scope of Application

The WXH-801A series protection device is a digital ultra high voltage line fast protection device implemented by a microcomputer, which can be used as the main protection and backup protection for transmission lines with voltage levels of 220kV and above.

1.2 Protection configuration

The WXH-801A series line protection device includes a full line quick action main protection with longitudinal positive sequence fault component direction protection and zero sequence direction protection as the main body, a complete set of backup protection consisting of three-stage phase to phase and ground distance protection and four stage zero sequence protection, and optional automatic reclosing, zero sequence inverse time limit and three-phase inconsistency protection.

The WXH-801A series protection device has a suffix based on its function, and the meanings of each suffix are as follows:

The specific configuration of WXH-801A series protection is as follows:

1.3 Product Features

Based on the high-performance and highly redundant Xuji next-generation hardware platform, visual logic development tools are used to achieve transparent protection design. The principle of variable action characteristics comprehensively improves protection performance. Advanced fiber channel technology, the "log system" of device memory, and the "black box" fault location technology are the main features of this protection device.

1.3.1 Protect performance

² Fast action speed, with a fault action time of less than 10ms at the near end of the line, and a typical metal fault main protection action time of less than 30ms within the entire line;

² The longitudinal direction and distance protection adopt the principle of variable action characteristics, which greatly improves the protection sensitivity while ensuring the protection speed;

² Using dual digital filtering algorithm to coordinate work, effectively ensuring fast action and measurement accuracy of distance protection;

² The adaptive oscillation criterion and advanced oscillation recognition function ensure that distance protection can be reliably locked in case of system oscillation and out of zone faults, and can quickly respond to faults in the non oscillation zone and reliably respond to faults in the oscillation zone;

1.3.2 Software and hardware platforms

² Adopting high-performance, reliable, and powerful Xuji next-generation hardware platform, 16 bit high-precision dual AD, floating-point operation 32-bit DSP, fully considering redundancy and functional expansion, multiple DSPs work together to complete the main and backup protection functions;

² The visualized logic development tool VLD, in which all protection logic is composed of visualized flexible relays in the development environment, achieves complete transparency design of microcomputer protection;

² The software runtime memory content is recorded in the "log system" and the protection logic information is recorded in the "black box" to quickly and accurately locate abnormal situations;

² The device adopts a whole panel and a standard 6U chassis, with plug-in connections and strict separation of strong and weak electrical circuits, greatly improving the anti-interference ability of the device;

² The AD circuit, CPU plugin, relay coil, and other components of the device are fully self checked.

1.3.3 operating interface

² With the help of XJ-GUI interface design tools, flexible customization and user-friendly design of the operating interface can be achieved;

² Display of main wiring diagram and rich real-time data;

² Class WINDOWS menu, through menu prompts, all device operations can be completed.