30-08-2017, 01:43 PM
Most power quality problems are due to incorrect connections of an electrical system. Using CTs and leakage current monitors, you can check an electrical system during installation acceptance tests and also during maintenance and system renovation. Be careful with partial or complete shorts between the neutral and its grounding network. They will often create disturbances in the quality of energy.
it is proposed the design and development of a remote system for continuous monitoring of leakage currents and earth currents in high voltage electrical substations. Based on wireless local area network technology, the system can be used to continuously monitor a variety of plants within the substation and has low power consumption with built-in overvoltage protection. It consists of a transmitter module equipped with a data acquisition system (DAQ) connected to current and leakage voltage sensors, and a receiver module connected to a remote controller for data processing and storage. The principle of operation and the characteristics of the various components of the system are described. Validation tests have been used to verify their operation in three different test situations: A) laboratory control of the leakage current and voltage of a distribution lightning arrester; B) laboratory measurement of the leakage current of an external insulator; and C) ground current field monitoring and the potential increase of the high voltage tower. The measured results are in close agreement with those directly recorded through a DAQ card with fiber optics and systems connected by coaxial cable. Data processing is performed at the receiving end so that the monitored parameter is displayed continuously or at specified time intervals. System performance has been tested and proven resilient under high frequency interference signals such as those generated by corona and surface discharges.
it is proposed the design and development of a remote system for continuous monitoring of leakage currents and earth currents in high voltage electrical substations. Based on wireless local area network technology, the system can be used to continuously monitor a variety of plants within the substation and has low power consumption with built-in overvoltage protection. It consists of a transmitter module equipped with a data acquisition system (DAQ) connected to current and leakage voltage sensors, and a receiver module connected to a remote controller for data processing and storage. The principle of operation and the characteristics of the various components of the system are described. Validation tests have been used to verify their operation in three different test situations: A) laboratory control of the leakage current and voltage of a distribution lightning arrester; B) laboratory measurement of the leakage current of an external insulator; and C) ground current field monitoring and the potential increase of the high voltage tower. The measured results are in close agreement with those directly recorded through a DAQ card with fiber optics and systems connected by coaxial cable. Data processing is performed at the receiving end so that the monitored parameter is displayed continuously or at specified time intervals. System performance has been tested and proven resilient under high frequency interference signals such as those generated by corona and surface discharges.