distributed fiber optic temperature sensor for Cable Tunnels-INNO

電力システムのスマートグリッドには発電所が含まれます, 高圧送電網, 変電所, 配給所, 等, 特に発電機を含む, 変圧器, 電源ケーブル, スイッチおよびその他の電源装置. 電力機器は通常、高電圧などの環境で動作します。, 強い電場, 熱負荷と, 作業環境は無人で監視もされていません. エンジニアリングインフラとして, スマートグリッドには数千世帯の電力需要が関係します, 電力設備の動作温度は、スマートグリッドの安全な動作を確保する上で重要な要素です。. トランスフォーマーかどうか, 電源ケーブル, またはその他の電力機器, 電力システムの重要なコンポーネントとして, 回路の問題や外部要因により、局所的な過熱やアークスパークが発生する可能性があります。, 火災を引き起こし、人々の生産と生活に損失をもたらす. したがって, このような悪影響を避けるために, 電力設備の総合的な温度監視の実施が急務である. The environmental temperature and cable operation status of cable tunnels used to accommodate a large number of cables laid on cable supports in corridors or tunnel structures can only be detected when faults occur. The longer the operation time, 過熱や発火事故が発生しやすくなります, 多大な経済的損失を引き起こす可能性がある.

With the increasing deployment of power and communication in tunnels, fiber optic cables are mostly laid underground. During the long-term use of fiber optic cables, temperature monitoring is required to prevent serious safety accidents such as fires due to high temperatures. Through long-term monitoring and analysis of temperature, many information about fiber optic temperature can be obtained. したがって, whether temperature can be monitored for a long time, 継続的に, and accurately largely determines the accuracy and timeliness of temperature warning and alarm.

If point temperature measurement is used, it is prone to electromagnetic interference and is not suitable for strong electromagnetic scenarios, その間 光ファイバー温度センサー are not affected by electromagnetic interference and are very suitable for temperature monitoring in power systems. Fiber optic temperature sensors include single point temperature sensors and quasi distributed fiber optic temperature sensors. 単一点温度センサーは、高い測定精度と信頼性で温度フィールド内の特定の点を測定します。, しかし、温度場の複数の点の分布を測定することは困難です. To solve the measurement problem of multi-point distribution of temperature field, a quasi 分散型光ファイバー temperature sensor composed of a multiplexed fiber optic temperature sensor and an array of fiber optic temperature sensors has emerged. The quasi distributed fiber optic temperature sensor uses a single point fiber optic sensor array to form a spatial network distribution to achieve distributed fiber optic temperature measurement. The measurement accuracy and speed may be affected due to resolution, 帯域幅, or spatial structure, making it difficult to accurately measure and locate temperature.

Distributed fiber optic temperature sensing for tunnel cables

The purpose and principles of designing a distributed fiber optic fire alarm system
(1) 目的: In order to detect and report fires early, prevent and reduce fire hazards, ensure normal production and life, protect personal and property safety, important large buildings and high-rise building clusters must consider designing and installing automatic fire alarm systems.
(2) 原則: 安全で信頼できる, easy to use, 先進技術, and economically reasonable.

The characteristics of tunnel cables

Industrial cable tunnels are composed of a large number of cables laid together, suitable for long-distance transmission of electrical energy. Cable is an important power transmission equipment, and the production of modern industrial enterprises cannot be separated from electricity, and the transmission of electricity is completed by a large number of cables. It is a bridge to ensure the normal operation of industrial enterprises; It is the reserve force for the survival of industrial enterprises; It is an important component of the lifeline of industrial enterprises.

Prediction of tunnel cable fire faults

According to the analysis of power accidents, cable overheating faults can cause fires, leading to extensive cable burning and forced shutdown, making it impossible to resume normal production and life in a short period of time, causing significant economic losses and social impact. Through the analysis of accidents, it is found that overheating of cable joints is the direct cause of cable fires, and overheating of cable joints is caused by loose compression joints, oxidation of joints, 等, which leads to excessive contact resistance. Long term high-temperature operation causes insulation to decrease and breakdown, ultimately leading to the occurrence of cable fires. Based on the analysis of the characteristics of cable overheating faults, an effective method to prevent cable overheating and fire is to timely monitor the temperature of cable joints, analyze the aging degree of cable joints based on the trend of joint temperature changes, and issue an alarm before the actual failure of cable joints occurs.