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Installation experience of switch cabinet wireless temperature measuring device

2018-04-30 09:36:35

This paper introduces the installation experience of high voltage switchgear wireless temperature measuring device (passive wireless surface acoustic wave technology). Compared with other temperature measurement methods, this technology has the advantages of "passive", "wireless", "long life" and "maintenance-free", which is especially suitable for power industry applications.

Tools/Materials
1

Wrench, screwdriver, crimping tool, wire stripper

2

Multimeter, debugging computer, communication adapter

3

Infrared thermometer

Methods/Steps
1

The installation positions of the sensor, antenna and reader in the switchgear cabinet are shown in the figure. The installation positions of the sensor are in the breaker contacts and cable connectors, the antenna is attached to the inner wall of the cabinet, and the reader is installed in the secondary instrument compartment.

2

Sensor installation: First loosen the bolt of the high pressure busbar connection point in the switch cabinet, clamp the tuning fork sensor under the bolt gasket, and then tighten the bolt and apply the specified torque force; The sensor on the circuit breaker adopts the tie-type sensor structure, and can be installed on the static contact or the moving contact arm according to the circuit breaker structure

3

The antenna is placed on the side wall of the chamber where the sensor is located, and the antenna cable is led into the secondary instrument room through the cable trough.

4

Install the reader in the secondary instrument compartment, and take AC/DC 100-240V power supply from the instrument room, and the power supply is connected to the reader through the air

5

System debugging: Push the circuit breaker to the test position, close the rear door of the switch cabinet, connect the temporary power supply for debugging, and confirm that the sensor signal is normal after the equipment installation is completed. Connect the RS485 bus to the monitoring terminal or directly connect the 4G DTU device to realize remote monitoring.

Matters needing attention
1

The sensor installation position should comply with the corresponding specifications, and cannot be too close to the sheet metal, otherwise the signal will be affected

2

Signal debugging should be carried out when the switch cabinet components are reset

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