Temperature and contact resistance of power cable

This equipment is used to monitor variations of temperature and contact resistance at connections of main power cable joints. They also send out alert due to over heating.Contact resistance, at high voltage power cable joints and high voltage switches, increases due to certain factors. As a result, temperature at these joints or switches will increase and cause oxidation. These will further increase contact resistance, and eventually, damages the joints or switches due to over heating. Therefore, temperature monitoring is crucial. The principles of the equipments are as follows: By measuring both temperature (T) and current (A) of each test/monitoring point, and then analyzing the T/A relationship can accurately work out the contact resistances. The equipments digitalize sample values of temperature and current, and then transmit measurement data, as 2.4GHZ RF signal, to digital processor and display to users. This equipment has 2 variants: 1.Local Display Type CSM-SLT 2.Network type-with RS-485 connector End users read off temperature and current measurements manually. Composition: Temperature, current sensor3/6/12/15PCS Data transceiver 1PC Display unit CSM-SLT1PC AC220V/DC6V PSU1PC Functionalities: 1.Each single equipment can measure temperature and current variations of 3-15 test points 2.Temperature and current measurements are displayed up to 3 significant decimals. 3.Display panel has switching button, users can toggle temperature and current readings by pressing the button. Characteristics: 1.Temperature, Current Sensor Temperature, current measurement range: Current:0A--999A ac Temperature: 0--150oC Current measurement accuracy:± 10% Temperature measurement accuracy:±1oC Environment Temperature:-25oC+85oC RF frequency2.4GHZ Transmit power: 1mW Receiver sensitivity: ≤-90dB Max. transmit range: ≥10m W.D.H:40mm×43mm×26mm 2.Data transceiver RF frequency: 2.4GHZ Transmit power:1mW Receiver sensitivity:≤-90dB Date transmission rate:1Mbit/s RS485 date transmission rate: 9600bit/s W.D.H:70mm×60mm×30mm 3.Display unit RS485 date transmission rate:9600bit/s Max. power dissipation while reading data:3.6V ≤50mA W.D.H: 92mm×46mm×63mm Installation: This equipment should be installed in high voltage switch cabins. Temperature and current sensors should be fixed at cable connections as test points. Data transceiver should be fixed inside the cabins, and display units should be fixed on top lf the cabin. RS-485 connector connects data transceiver and display unit, 6V DC power should be supplied to the transceiver. Metal shielding must be avoided between sensors and data transceiver. Otherwise, signal strength may be weakened. Functionalities: This equipment has RS-485 connector embedded, which enables network monitoring and measuring. 1. Each network can monitor up to 480 test points, and many networks can link up to become a larger network 2. Display panel can operate in 2 modes continuous measurement reading mode or alert mode 3. Display panel can work out contact resistances according to temperature/current variations at particular test point 4. According to history data and current measurements to find out faulty test points 5. Display Temperature/Current measurements in graphical format 6. Save recently measurements CSM-SLT COM Data centralizer Data Interface:RS-485 RS485 max connection: 32PCS Receiver RS485 date transmission: 9600bit/s Connector PC interface: RS-232 Power supply: DC6V/2A W.D.H: 80mm×40mm×130mm To achieve multi-points measurements, CSM-SLT can be linked up with a database and controller (with data management software).