During the operation of power system, various failures and abnormal operating states may occur. The most common and also the most dangerous failure is the occurrence of various types of short circuits. Line protection mainly aims to address various failures in transmission lines. Different protection models can be selected according to the system conditions, such as single-circuit line, double-circuit line on the same tower, series capacitor compensation line, single channel and dual-channel, and diverse configuration methods can be chosen according to the actual requirements.

The PRS-7910 Station Manager is designed for the highest standards of performance, safety and reliability to meet requirements of a complex substation automation system (SAS). As a part of the SAS, it works as a station communication manager, which collects, stores and maps signals of relays, measurement units, control units and other IEDs in the substation to higher-level systems such as control center (CC) and distributed control system (DCS).

During the operation of power system, various failures and abnormal operating states may occur. When the circuit breaker fails, it tends to affect the parallel operation stability of power system. The circuit breaker protection can cut off other related circuit breakers in the same plant and station in a short time limit, so as to minimize the scope of power outage, ensure stable operation of the entire power grid, and avoid serious burning of fault components such as the generator and transformer and the collapse of power grid.

CYG PRS-7961 Industrial Ethernet Switch, designed for Communications Networking Devices Installed in Electric Power Substations and harsh industrial environment. Widely used in smart grid, new energy, industrial control, transportation, water conservancy and other fields.

The PRS-7367 is a numerical distributed protection intended for protecting and monitoring various primary apparatus including overhead line, underground cable, transformer, capacitor, etc.

PRS-7391 time synchronization device is applicable to substations and power plants with the voltage grade ranking at or above 10KV, which provides time and synchronization information for various secondary equipments in the plants and stations, such as dispatch automation system, microcomputer relay protection device, fault recorder, event sequence recording device, tele-control device (RTU), computer data exchanging network, intelligent electronic device (IED), etc.