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A new method of pinpointing dielectric fluid leaks on pipe-type and selfcontained cables using perfluorocarbon tracer (PFT) is presented. The method has successfully been used on the Con Edison transmission system to locate leaks of dielectric fluid on both types of cables. Application of the PFT technique does not require feeder deenergization and provides major advantages over the conventional method of freeze and pressure testing. Description ofthe method and results of field application are presented in the paper. eywcrards: pipe-type, self-contained; leak location, dielectric fluid leaks, fluid-filled cable.

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The 345 kV cables are predominantly forced cooled.Forced cooling is achieved through the installation of cooling plants. The main components of a cooling plant are the pumps, air-to-fluid heat exchangers, refrigeration equipment, and hydraulic system. Various stages of the cooling system provide different levels of transmission of Forced Cooled Transmission Cables then used to compute ratings.The model is composed of more than 1,600 sirnultaneous partial differential equations that are solved every 5 minutes by the central processing unit (CPU), which also refreshes the ratings at this rate. The CPU, located at the Sprain Brook Substation, obtains cable loading locally

This paper describe the development and testing of a pressure surge accumulator suitable for field installation on high preswue fluid filled pipe cable circuits. Test results show that installation of pressure surge accumulat~ will reduce the electrical fault pressure surge to a level low enough to p W d the pothead pOI&h from NptUre.A 345 kV full stop designed to withstand adiffemtial pressure of the full line pressure, was pressure surge tested to show that the joint would be able to withstand the preamre surges developed during an electrical fault.The tests showedthat the designis capable of withstanding the pressure surges without damage.