Busbar is an important component of power plant and substation. When there is busbar failure of power plant or substation, if the fault is not removed in time, it may cause damage to many power equipment, affect the stability of power system, and cause power outage in substation. In severe circumstance, it may even cause collapse of the regional power system.Busbar protection is an important secondary system device to ensure safe and stable operation of the power grid, and its safety, reliability, sensitivity and fast response are of decisive significance to guarantee the safety of entire regional power grid. Therefore, it is very necessary to set up a busbar protection with safe operation, reliable action and good performance, so that the fault of busbar can be quickly detected and removed in a timely and selective manner.The BP microcomputer busbar protection independently developed by CYG SUNRI was introduced 1995. With the development of automation, digitization and intelligence of the power system, we have constantly innovated, and successively introduced digital, intelligent and distributed products.

Busbar is an important component of power plant and substation. When there is busbar failure of power plant or substation, if the fault is not removed in time, it may cause damage to many power equipment, affect the stability of power system, and cause power outage in substation. In severe circumstance, it may even cause collapse of the regional power system.Busbar protection is an important secondary system device to ensure safe and stable operation of the power grid, and its safety, reliability, sensitivity and fast response are of decisive significance to guarantee the safety of entire regional power grid. Therefore, it is very necessary to set up a busbar protection with safe operation, reliable action and good performance, so that the fault of busbar can be quickly detected and removed in a timely and selective manner.The BP microcomputer busbar protection independently developed by CYG SUNRI was introduced 1995. With the development of automation, digitization and intelligence of the power system, we have constantly innovated, and successively introduced digital, intelligent and distributed products.

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.

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.

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

Transformer is important electrical equipment commonly used in power systems. Its safe operation directly decides the power supply and stable operation of power system, especially the large-capacity transformer, and once it is damaged due to failure, the loss will be even greater. Therefore, according to the failure and abnormal working conditions of the transformer, it is necessary to install a relay protection device with reliable operation and good performance according to its capacity and importance.

PRS-789-H serial auxiliary relay mostly cooperates with main protection relay to achieve trip circuit supervision, from the positive supply to the negative supply whilst the circuit breaker is open or close status, and as well trip &close activation with self-adaption trip &close coil current, or lockout relay with bi-stable function.