光CT原理.ppt

Introduction NXCT Better Solutions to your Problems Today’s technical specs and standards based on oil-filled instrument transformers. With Digital Instrument Transformer sensors, obvious facts like ratio, burden, cost evaluation, or mounting arrangement can be reconsidered  Our DIT propose a new and wider range of solutions, with an accumulation rather than a selection of advantages.? More functions than before. What is an ”Opto-electronic Sensor ? A complete measurement system based on an opto-electronic sensor includes Primary Converter : it is the sensing part. Interaction with the phenomenon (current or voltage) Secondary Converter Electronic signal processing Interface with equipment Optical Fiber linking both parts(including specific bushings, HV insulation, …) 2 main types of primary converters Intrinsic optical sensor : fully passive ? NXCT Hybrid sensors : with electronics at high voltage ? ROGOWSKI DIT Products History of the Technology Current Sensors Deployed 1000 units in 22 countries 69 kV to 800 kV HV AC CT HV DC CT Flexible CT High Current DC (OEM to DynAmp) GIS CT Transformer bushings Underground cable 8 km (new 2009) AREVA Current SensorNXCT Digital Current SensorsNXCT System Components Digital Current SensorsWhy digital ? Secondary Loads Digital Current Sensors Scale Factor Adjustment Ratio change NXCT Digital Current SensorsMain characteristics 36 kV to 1200 kV AC 25 kV to 800 kV DC Wide dynamic range 1 A to 4000 A (metering) Up to 108 kApeak (protection) Frequency Bandwidth DC to 6 kHZ (up to 20 kHz for special requests) Long Term Stability Measurement Canada, NY ISO, CA ISO, LAPEM, and Russian Certification for metering. Outdoor operating temperatures -40°C to 55°C (-40°F to 131°F) Computer access to extensive diagnostic functions. Short lead times 16 weeks from time of order. Programmable scale factor (updates can be made at installation) Comparing Technologies Conventional Current Transformers Digital Current SensorsNXCT