Research and practice have proven that compared with traditional relay protection, microcomputer protection has many advantages, and its main features are as follows:
a) Improve and enhance the operating characteristics and performance of relay protection, with a high correct operation rate. This is mainly reflected in the ability to obtain characteristics that are not easily achieved with conventional protection; its strong memory can better implement fault component protection; it can introduce automatic control, new mathematical theories and technologies such as self-adaptation, state prediction, fuzzy control, and artificial neural networks, and its high correct operation rate has also been proven in operational practice.
b) It is convenient to expand other auxiliary functions. For example, fault recording, waveform analysis, etc., and it can conveniently add functions such as under-frequency load shedding, automatic reclosing, fault recording, and fault location.
c) Superior process and structure conditions. This is reflected in relatively universal hardware, easy manufacturing with unified standards; small device size, reducing the number of panels; and low power consumption.Arrester counter tester is used to test whether various types of discharge counters operate normally.
d) Reliability is easy to improve. This is reflected in the fact that the characteristics of digital components are not easily affected by temperature changes, power supply fluctuations, or service life, and are not easily affected by component replacement; and the self-check and inspection capabilities are strong, allowing software methods to detect the working conditions of main components, parts, and the functional software itself.
e) Flexible and convenient to use, with an increasingly friendly human-machine interface. Its maintenance and debugging are also more convenient, thereby shortening maintenance time; at the same time, based on operational experience, the characteristics and structure can be changed on-site through software methods.
f) Remote monitoring is possible. The microcomputer protection device has serial communication capability, and the communication with the substation microcomputer monitoring system endows the microcomputer protection with remote monitoring characteristics.
