1 Overview

1.1 Scope of Application
The WXH-821C microcomputer line protection and measurement device (hereinafter referred to as the device) realizes the protection and measurement functions of lines in non directly grounded systems (neutral point ungrounded or grounded through arc suppression coils) or small resistance grounded systems, mainly used for the protection and measurement of line intervals in traditional substations with voltage levels of 35kV and below.

1.2 Protection configuration
The specific protection configuration of the device is detailed in Table 1-1.
Table 1-1 Protection Configuration of WXH-821C Device

1.3 Product Features
Xu Ji's independently owned "VLD" visualization tool has high software reliability.
Equipped with offline logic simulation function, it can achieve transparency in accident analysis.
The device adopts a fully enclosed chassis, with strict separation of strong and weak electricity, strong anti-interference ability, and comprehensive self inspection of hardware circuits.
Configure 2 Ethernet ports and support IEC 61850 communication protocol.
The timing method supports SNTP timing, B-code timing, GPS pulse timing, and 1588 timing.
Complete event protection processing, capable of storing the latest 80 event report records, 100 action report records, and recording 10 cycles of current and voltage reports.
 Friendly human-machine interface, fully Chinese Windows menu mode, clear structure, easy to use.
The protection function is fully configured and can be selected through configuration tools to meet the personalized needs of customers.
The configuration of the operating circuit is flexible and can adapt to various operating mechanisms.