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              Welcome to: Ningbo Ligong Online Monitoring Technology Co., Ltd!  Hotline:400-8269-696

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              Current location:Home> Products&solutions > Transformer on - line monitoring system


              MDD3000T Intelligent On - line Monitoring System for Transformers


                     MDD3000T Transformer on-line monitoring system is an online dynamic integrated transformer fault diagnosis system, composed of on-line monitoring and fault diagnosis. The on-line monitoring section includes basic units such as dissolved gases and micro-water in the oil, dielectric loss and partial discharge of the casing, and can expand the core ground, winding deformation, temperature load and switch input interface (cooling fan, oil pump, gas relay) Such as online monitoring. Fault diagnosis part includes fault diagnosis module, fault qualitative and positioning diagnosis module, fault severity and development trend analysis module, fault hazard assessment module and maintenance strategy module.

                      MDD3000T Transformer intelligent components are transformer intelligent devices, mainly by iMAS2020T embedded processor (main IED), iMGA2020 chromatogram micro water monitoring IED, iPDM2020T partial discharge monitoring IED, iIMM2020 casing insulation monitoring IED, iCSM2020 cooling unit monitoring IED, iOLTC2020 Switch monitoring IED, iOCM2020T condition information monitoring IED, iOFT2020 winding temperature fiber monitoring IED and fiber switches, and according to the need to expand other monitoring IED. Each IED is equipped with fanless cooling to improve reliability, the use of shelves 19-inch standard chassis installed in the cabinet. Transformers each phase using a set of intelligent components, in the field near the transformer installation, and access to MDS4000 system, intelligent substation status monitoring and evaluation system components.

              Monitoring content:



              Monitoring content

              Analysis Project

              Analysis model



              Dissolve gas in oil

              The concentration of dissolved gas in the oil, and the gas production rate of the dissolved gas component in the oil

              GB/T 7252(IEC 60599)

              Oil content in oil


              Partial Discharge

              Discharge capacity, discharge frequency, discharge type, discharge position

              GB/T 7354(IEC60270)



              Dielectric loss

              Dielectric loss, equivalent capacitance, last screen current

              DL/T 962-2005

              Equivalent capacitance

              The end of the screen current


              Cooling unit

              Cooler fan and pump operating status

              Winding hot spot temperature
              Winding hot spot temperature cooling device efficiency
              Temperature equilibrium state
              DL/T 984-2005
              IEEE C57.91-1995

              Cooler fan and pump motor drive current

              Cooler fan and pump total run time

              Cooler intelligent control


              Tapping switch

              Stall state

              Contact wear
              Control reliability


              Motor drive current

              Protect the relay state

              Online oil filter status

              OLTC intelligent control


              Condition information

              Load voltage, current

              Voltage effective value
              Current rms


              Main tank gas pressure

              Main oil tank oil level and oil level status

              Core, clip, neutral ground current

              Environment, cabinet temperature and humidity

              Top, bottom oil temperature and winding temperature



              Winding temperature

              Transformer aging rate
              Transformer life loss
              DL/T 984-2005
              IEEE C57.91-1995


              Intelligent components

              The LordIED

              Transformer aging rate/div>
              Transformer life loss
              Comprehensive evaluation of transformer status

              Own assessment model