Abstract: Methods of testing at least a transmission line of interest within a group of transmission lines for anomalies using Time Domain Reflectometry are provided. The testing methods set forth herein aim to improve, for example, the quality and accuracy of information collected when propagating signals along a length of transmission line in order to pinpoint specific anomalies. To achieve this and other benefits, the testing methods simultaneously impose, for example, pulses of equal magnitude and form onto a group of transmission lines, such as the phases cables of a three phase power transmission cable system. From this, at least one transmission line from the group is monitored for reflected signals caused by impedance change. An example TDR is also provided.

Abstract: The charge value of a partial discharge pulse in an electrical cable is provided by analyzing the frequency spectrum of the propagated pulse in a spectrum analyzer 21 to generate sets of spectrum signals, each including a magnitude and a frequency of a component of the pulse. A laptop computer has a processor, receives the spectrum signals, and has one or more application computer programs operable to perform the calculations of Equations 2-6, finds the bandwidth and energy of the spectrum signals from which the computer programs derive unknown time domain parameters including the maximum value of the pulse and the time interval of the pulse at half its maximum value. With those parameters, the program reconstructs a time domain signal of the pulse and integrates that signal to provide the charge value of the partial discharge.

Abstract: Data acquisition systems and methods for acquiring test data associated with standard insulated power cables and/or power equipment such as switchgears, transformers, electric motors, etc are disclosed. The test data may then be subsequently analyzed for defects, such as the presence of faults, discharges (e.g., PD, coronas, arcing, etc.). The systems may store the acquired test data on removable, non volatile memory, such as Flash memory. The removable memory may be retrieved by an un-skilled technician periodically and returned to a lab or other test facility for subsequent analysis by highly trained analysts.

Abstract: Methods of testing at least a transmission line of interest within a group of transmission lines for anomalies using Time Domain Reflectometry are provided. The testing methods set forth herein aim to improve, for example, the quality and accuracy of information collected when propagating signals along a length of transmission line in order to pinpoint specific anomalies. To achieve this and other benefits, the testing methods simultaneously impose, for example, pulses of equal magnitude and form onto a group of transmission lines, such as the phases cables of a three phase power transmission cable system. From this, at least one transmission line from the group is monitored for reflected signals caused by impedance change. An example TDR is also provided.

Abstract: A system and method for field fluid sampling and analyzing dissolved gases in electrical equipment fluids is described. The system includes a disposable vial which is sealed with a self-sealing stopper. Fluid to be analyzed is inserted into the vial by a hollow needle. Also described is apparatus for evacuating and sealing the vial and apparatus for introducing fluid from electrical equipment into the vial.