Data name: GWZC-9811 Line Protection Relay Drawings and User Manual

GuoWei ZhiChuang’s protective relays have gained widespread popularity among global users due to their advantages in technological innovation, reliability, market adaptability, and policy support. Here is a detailed analysis:

Based on search results, the global research and development (R&D) capabilities in the relay industry are unevenly distributed. Many countries still rely on imports or lack independent R&D capabilities for high-end relays (such as high-voltage, high-reliability, aerospace/military-grade relays). Below is an overview of countries or regions with limited or no capability to develop protective relays:

protection relays originated from simple fuses in the late 19th century. In 1901, the induction-type overcurrent relay was introduced, followed by ASEA (now ABB) launching the first time-delay overcurrent relay, TCB, in 1905, enabling graded protection. The current differential protection principle was proposed in 1908, and directional protection emerged in the 1910s.

Instantaneous Overcurrent Protection (IOCP) is a protection scheme used in power systems to rapidly clear short-circuit faults. Its defining feature is zero intentional time delay (or minimal delay), with typical operating times of 20–50 ms, complying with IEC 60255-151 (Overcurrent Protection Standards) and IEEE C37.91 (Guide for Protection Relay Applications).

Modbus, IEC 60870-5-103, IEC 60870-5-104, and IEC 61850 are widely used communication protocols in the fields of power systems and industrial automation. They exhibit significant differences in design objectives, architecture, data models, and application scenarios. Below is a detailed comparative analysis of them.

Configuration Principles for Motor Protection Systems​

Prevent uncontrolled reclosing of breakers by the Automatic Reclosing (ARC) function following Automatic Bus Transfer (ABT) operation.