Fluorescent optical fiber temperature online monitoring system

According to the structure of the wind farm, the above monitoring technology is applied to the wind farm equipment as shown in Figure 11 below:
On the fan: fan grid-connected cabinet, frequency conversion cabinet contact temperature measurement, gear box, fan stator temperature monitoring. Under the fan: temperature monitoring of the box change.
Step-up station: Intelligent monitoring of winding temperature of step-up main transformer, intelligent monitoring of temperature of high and low voltage switch cabinet contacts and cable joints, and temperature monitoring of cable trench cable operation in the station.

Figure 11

4.1 Contact temperature measurement of fan grid-connected cabinet and frequency conversion cabinet

General installation location: grid-connected cabinet on the top of the wind turbine, input side U of the grid-connected cabinet in the frequency conversion cabinet, input side V of the grid-connected cabinet, input side W of the grid-connected cabinet, generator stator side U of the grid-connected cabinet, and stator side of the grid-connected cabinet generator V. The generator stator side W of the grid-connected cabinet, the grid side contactor U of the frequency conversion cabinet, the grid side contactor V of the frequency conversion cabinet, and the grid side contactor W of the frequency conversion cabinet.

As shown in Figure 12 below, connect the nose of the temperature measuring optical fiber head and the nose of the outlet cable connector to the copper bar with bolts. The optical fiber is routed along the cable to the installation position of the thermometer and connected to the fluorescent optical fiber thermometer. , Fluorescence optical fiber thermometer needs AC 220V power supply, can realize the local temperature display, and upload real-time temperature data to the monitoring software through the 485 communication signal.

 Figure 12

4.2 Fluorescent optical fiber temperature control system for box-type transformers (used for temperature monitoring of box-type transformers in wind farms)

The fluorescent optical fiber temperature measurement system for box-type transformers can directly monitor the hot-spot temperature of box-type transformers, improve the operation safety of the equipment, extend the insulation life of the equipment, judge the actual load capacity of the equipment in real time, and maximize the potential of power transmission and distribution to improve the equipment’s performance. Economic benefits are of great significance.

Box-type transformer temperature measurement system installation plan

The temperature measurement position of the box-type transformer is at the low-voltage winding or the high-voltage winding and the iron core. The maximum temperature measurement requirement is 200℃. Therefore, the box-type transformer temperature measurement fiber is designed and combined with the fixing device, and the temperature measurement hole is reserved during the box-type transformer casting process. , The temperature of the winding position can be directly measured by implanting the optical fiber into the temperature measuring hole during temperature measurement. The schematic diagram of temperature measurement is shown in Figure 13.

Figure 13

4.3 Fluorescent optical fiber temperature control system for oil-immersed transformer windings (temperature monitoring of main transformers in wind farms)

4.3.1 Introduction of Fluorescent Fiber Optic Temperature Measurement System

The entire temperature measurement system is mainly composed of optical fiber temperature measurement host, fluorescent optical fiber sensor, adapter cable, penetrator, flange and so on. The fluorescent optical fiber sensor is directly placed on the heating part of the transformer winding coil. The flange guarantees the sealing of the transformer's own structure. The other end of the fluorescent optical fiber sensor and one end of the adapter cable are respectively connected to the inner and outer sides of the penetrator on the flange. In order to realize the transmission of optical signals, the other end of the switching fiber is connected to the fluorescent optical fiber thermometer. The fluorescent optical fiber sensor transmits the optical signal to the temperature measurement host, and the temperature measurement host demodulates the received optical signal into a temperature signal. Display and communicate with the monitoring system through the 485 interface to realize real-time monitoring of the transformer winding temperature.

Figure 14

4.4 Fluorescent optical fiber temperature control system for high voltage switchgear

As shown in Figure 15, the optical fiber thermometer is installed in the secondary room of the switchgear, and the temperature measuring optical fiber is usually installed at the static contact and the cable joint.

Figure 15 Installation diagram

Figure 16 Software interface