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-7973 fault recording and ranging equipment is used to record the whole process of change of electrical quantities such as current, voltage, frequency, and their derived quantities (active power and reactive power etc.) as well as relevant non-electrical quantities during various faults in the power system, e.g. short circuit, oscillation, frequency collapse, and voltage collapse etc.

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.

PRS IED Studio configuration tool is a software designed for configuration PRS series devices. It can acquire IED real-time data, configures the inputs, outputs and parameters of devices in visual and graphic display to facilitate project configuration. Modularization design is adopted to achieve high accuracy, better flexibility and interactive capability.