06-09-2017, 09:57 AM
This is a new technique for the protection of transmission systems through the use of global positioning system (GPS) and transients generated by failures. In this scheme, the relay contains a fault transient detection system together with a communication unit, which is connected to the power line through the CVT high voltage coupling capacitors. The relays are installed on each busbar in a transmission network. These detect the high frequency transient voltages generated by failures and record the time instant corresponding to when the initial displacement wave generated by the fault reaches the busbar. The decision to fire is based on the components that are propagated through the system. Extensive simulation studies of the technique were performed to examine the response to different power systems and fault conditions. The communication unit is used to transmit and receive digital encoded signals of the local information to and from the associated relays in the system. In each substation, the relay determines the location of the fault by comparing the GPS time measured locally with those received from the adjacent substations, the extensive simulation studies presented here demonstrate the feasibility of the scheme.
Accurate fault locating in power transmission systems can save time and resources for the electric utility industry. Online searches for faults are expensive and may be inconclusive. Accurate information must be quickly acquired in a more useful form for the energy system operator communicated to the field staff. To achieve this precision, a complete system of fault localization technology, hardware, communications and software systems can be designed. The technology is available that can help determine the fault location within a span of 300 meters transmission. Reliable self monitoring hardware can be configured for installation sits with different geographic and environmental conditions. Communication systems can retrieve fault location information from substations and quickly provide information to systems to retrieve fault location information from substations and quickly provide that information to system operations. Other communication systems, such as Supervisory Control and Data Acquisition (SCADA), operate the fault by sectioning circuit breakers and switches remotely and provide a means of rapid restoration. SCADA data, such as sequence of events, relays and oscillographs, can be used for selection and verification of fault location. Software on a central computer cancels fault information and reduces operator response time by providing only the concise information required for field personnel communications. Fault locating systems usually determine the "distance to failure" from the end of the transmission line. Field personnel can use this data to locate map failure locations and transmission line drawings.
Accurate fault locating in power transmission systems can save time and resources for the electric utility industry. Online searches for faults are expensive and may be inconclusive. Accurate information must be quickly acquired in a more useful form for the energy system operator communicated to the field staff. To achieve this precision, a complete system of fault localization technology, hardware, communications and software systems can be designed. The technology is available that can help determine the fault location within a span of 300 meters transmission. Reliable self monitoring hardware can be configured for installation sits with different geographic and environmental conditions. Communication systems can retrieve fault location information from substations and quickly provide information to systems to retrieve fault location information from substations and quickly provide that information to system operations. Other communication systems, such as Supervisory Control and Data Acquisition (SCADA), operate the fault by sectioning circuit breakers and switches remotely and provide a means of rapid restoration. SCADA data, such as sequence of events, relays and oscillographs, can be used for selection and verification of fault location. Software on a central computer cancels fault information and reduces operator response time by providing only the concise information required for field personnel communications. Fault locating systems usually determine the "distance to failure" from the end of the transmission line. Field personnel can use this data to locate map failure locations and transmission line drawings.