How to install a high-voltage substation fiber optic temperature measurement system

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

The fiber optic temperature measurement system can ensure the stable operation of high-voltage switchgear. There are many common factors that affect the safe and reliable operation of high-voltage switchgear, and poor contact at the conductive connection is one of the most important factors. FJINO’s independently developed point type fluorescent fiber temperature measurement system has a complete range of models and reasonable prices.

Due to the heat generated by current flow, almost all electrical faults will cause temperature changes at the fault point. Overheating at the connection points of the dynamic and static contacts, cable joints, etc. of the substation switchgear due to poor contact is a serious accident hazard. In recent years, similar accidents have occurred in substations, causing power outages in mild cases and explosions and fires in severe cases, seriously affecting safety.

There is usually a time interval from the overheating of the switchgear joints to the occurrence of accidents. If temperature anomalies can be detected early and dealt with quickly, it will greatly reduce the incidence of electrical accidents. Through analysis and research, it has been decided to apply a high-voltage switchgear point type fiber optic online temperature measurement system. By using online monitoring methods, the operating temperature of electrical equipment, especially the temperature of sensitive locations, can be monitored. This is an important means of fault warning and accident prevention, and early detection of signs of equipment joint heating in the switchgear can prevent malignant accidents from occurring

The optical fiber temperature measurement system is progressiveness in the industry. FJINO has decided to apply the point type fiber optic temperature measurement system to the temperature monitoring system of the high-voltage cabinet in the power grid, in order to achieve comprehensive requirements for temperature monitoring inside the high-voltage cabinet and improve the safety and feasibility of substation operation. Taking the 10kV high-voltage switchgear of the 110kV substation as an example, this will be explained in detail.

Solution for Installation Quantity of Fiber Optic Temperature Measurement System for High Voltage Switchgear in Substation

The substation mainly undertakes the power supply tasks for production and daily life, with a total of 39 10kV high-voltage switchgear. We need to implement online monitoring of the temperature of the upper static contacts (A, B, C) three-phase, lower static contacts (A, B, C) three-phase, and cable heads (A, B, C) three-phase of the 39 switchgear, with a total of 351 detection points (39 × 9:351). Each switchgear is equipped with one 9-channel thermometer installed in the instrument room on the top of the switchgear, and one centralized monitoring host is configured in the main control room. The fiber optic sensor is installed at the junction of the static contact and the busbar. Special fixtures with high insulation, high thermal conductivity, high elasticity, high temperature resistance, and corrosion resistance are selected for fixing the sensing head. Optical fibers are routed along the corners of the cabinet and weak current cable trays, or tied together with insulation ties with secondary wires inside the cabinet. This monitoring system has complete monitoring and alarm functions, always ensuring that high-voltage equipment is in a monitored state, completely unaffected by human factors. When an alarm occurs, the system emits corresponding sound and light alarm signals, and the duty personnel have sufficient time to take corresponding measures. This is particularly important for avoiding accidents or causing fires.

Application and Implementation of Point Type Fiber Optic Temperature Measurement System for High Voltage Switchgear in Substation

The 35kV switchgear and 110kV switchgear in three substations are equipped with high-voltage switchgear point type fiber optic online temperature measurement systems. At present, the temperature monitoring of 1110 kV substation and 2 35kV substations has been completed, which solves the problem of real-time online temperature monitoring of the contacts and cable joints of 35kV and 10kV high-voltage switchgear in the substations, providing a guarantee for their safe operation. The system has been running normally for 2 years and has successfully detected 9 abnormal temperature fluctuations caused by poor contact at the conductive connection and 1 fiber breakage fault, and issued alarm messages. After troubleshooting, the system displayed that the temperature at the measuring point had returned to normal.

The application of point type fiber optic sensing technology in temperature monitoring of high-voltage switchgear in transmission systems has achieved real-time online temperature detection at key equipment points (contacts, cable joints). At the same time, we have adopted specially designed optical fibers with high voltage levels, which meet the requirements of high-voltage power switchgear equipment for fiber withstand voltage levels due to their electrical insulation, inherent safety, and immunity to electromagnetic interference. They also have advantages such as high transmission bandwidth, stable signal, resistance to electromagnetic interference, resistance to bending, high impact strength, and fast connection; The material of the fiber optic sheath has characteristics such as high temperature resistance, aging resistance, corrosion resistance, high insulation, and non adhesion, which can adapt to harsh environments such as high voltage, high temperature, and strong electromagnetic fields.