Prediction of switching transients in high voltage air-insulated substations

Describes the process of prediction of switching transients in high voltage air-insulated substations

Computation of transient electromagnetic fields due to switching in high voltage substations

Switching operations of circuit breakers and disconnect switches radiate transient electromagnetic fields within high-voltage substations. The generated fields may interfere and disrupt normal operations of electronic equipment. Hence, the electromagnetic compatibility (EMC) of this electronic equipment has to be considered as early as the design stage of substation planning and operation. Also, microelectronics are being introduced into the substation environment and are located close to the switching devices in the switchyards more than ever before, often referred to as distributed electronics. Hence, there is the need to re-evaluate the substation environment for EMC assessment, accounting for these issues. This paper deals with the computation of transient electromagnetic fields due to switching within a typical high-voltage air-insulated substation (AIS) using the finite-difference time-domain (FDTD) method

Time domain analysis of switching transient fields in high voltage substations

Switching operations of circuit breakers and disconnect switches generate transient currents propagating along the substation busbars. At the moment of switching, the busbars temporarily acts as antennae radiating transient electromagnetic fields within the substations. The radiated fields may interfere and disrupt normal operations of electronic equipment used within the substation for measurement, control and communication purposes. Hence there is the need to fully characterise the substation electromagnetic environment as early as the design stage of substation planning and operation to ensure safe operations of the electronic equipment. This paper deals with the computation of transient electromagnetic fields due to switching within a high voltage air-insulated substation (AIS) using the finite difference time domain (FDTD) metho

Basis for a wireless network for eMC measurements in electric substations

Switching operations of power equipment such as disconnect switch and circuit breakers in high voltage substations produce high frequency transient currents, which propagate along the busbars. The busbars then act as antennae, producing transient electromagnetic fields in the switchyards. In electromagnetic compatibility (EMC) considerations, the resulting fields are important sources of electromagnetic interference (EMI); moreover, highly sophisticated,. new technology equipment are being introduced into substation environment for measurement, control, protection and communication purposes. These equipment are located close to other switching equipment in switchyards. Hence, to establish the electromagnetic compatibility of the electronic equipment, it is desirable to quantify the high voltage environment. This paper describes a new digital wireless measurement system that is based on Bluetooth technology and which could be used in power stations or other similar harsh environment. It comprises a Remote Acquisition Unit (RAU), a Wireless Data Communication Network (WDCN) and a PC-based Control Platform. The performance and capability of the system was assessed against another measurement system based on fiber optics technology and was found to be more portable, easier to install and cheaper. The limitations of the wireless system are considered and ways of addressing them in the future are discussed