distributed fiber optic temperature sensor for Cable Tunnels

ເຊັນເຊີອຸນຫະພູມ Fiber optic, ລະບົບຕິດຕາມກວດກາອັດສະລິຍະ, ຜູ້ຜະລິດໃຍແກ້ວນໍາແສງແຈກຢາຍຢູ່ໃນປະເທດຈີນ

ຕາຂ່າຍໄຟຟ້າອັດສະລິຍະປະກອບມີໂຮງງານໄຟຟ້າ, ຕາຂ່າຍໄຟຟ້າແຮງດັນສູງ, ສະຖານີຍ່ອຍ, ສະຖານີແຈກຢາຍ, ແລະອື່ນໆ, ໂດຍສະເພາະລວມທັງເຄື່ອງປັ່ນໄຟ, ເຄື່ອງຫັນ, ສາຍໄຟ, ສະວິດແລະອຸປະກອນພະລັງງານອື່ນໆ. ອຸປະກອນພະລັງງານປົກກະຕິແລ້ວດໍາເນີນການໃນສະພາບແວດລ້ອມເຊັ່ນ: ແຮງດັນສູງ, ພາກສະຫນາມໄຟຟ້າທີ່ເຂັ້ມແຂງ, ແລະການໂຫຼດຄວາມຮ້ອນ, ແລະສະພາບແວດລ້ອມການເຮັດວຽກແມ່ນບໍ່ມີຄົນຂັບແລະບໍ່ມີການຕິດຕາມ. ເປັນໂຄງສ້າງພື້ນຖານດ້ານວິສະວະກໍາ, ຕາຂ່າຍໄຟຟ້າອັດສະລິຍະກ່ຽວຂ້ອງກັບຄວາມຕ້ອງການໄຟຟ້າຂອງຫຼາຍພັນຄອບຄົວ, ແລະອຸນຫະພູມການດໍາເນີນງານຂອງອຸປະກອນພະລັງງານແມ່ນປັດໃຈສໍາຄັນໃນການຮັບປະກັນການດໍາເນີນງານທີ່ປອດໄພຂອງຕາຂ່າຍໄຟຟ້າອັດສະລິຍະ. ບໍ່ວ່າຈະເປັນ transformers, ສາຍໄຟ, ຫຼືອຸປະກອນພະລັງງານອື່ນໆ, ເປັນອົງປະກອບທີ່ສໍາຄັນຂອງລະບົບໄຟຟ້າ, ພວກມັນອາດຈະເຮັດໃຫ້ເກີດຄວາມຮ້ອນສູງເກີນໄປ ຫຼືເກີດປະກາຍໄຟໃນທ້ອງ ເນື່ອງຈາກບັນຫາວົງຈອນບາງອັນ ຫຼືປັດໃຈພາຍນອກ, ​ເຮັດ​ໃຫ້​ເກີດ​ໄຟ​ໄໝ້ ​ແລະ​ສ້າງ​ຄວາມ​ເສຍ​ຫາຍ​ໃຫ້​ແກ່​ການ​ຜະລິດ ​ແລະ​ຊີວິດ​ຂອງ​ປະຊາຊົນ. ເພາະສະນັ້ນ, ​ເພື່ອ​ຫຼີກ​ລ່ຽງ​ເຫດການ​ຮ້າຍ​ແຮງ​ດັ່ງກ່າວ, ມັນເປັນການຮີບດ່ວນທີ່ຈະດໍາເນີນການກວດສອບອຸນຫະພູມທີ່ສົມບູນແບບຂອງອຸປະກອນພະລັງງານ. 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, ມັນມັກຈະເກີດອຸບັດເຫດຄວາມຮ້ອນເກີນ ແລະໄຟໄໝ້, ຊຶ່ງ​ອາດ​ຈະ​ເຮັດ​ໃຫ້​ເກີດ​ຄວາມ​ເສຍ​ຫາຍ​ທາງ​ເສດຖະກິດ​ຢ່າງ​ໃຫຍ່.

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. ເພາະສະນັ້ນ, whether temperature can be monitored for a long time, continuously, 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, while ເຊັນເຊີອຸນຫະພູມໃຍແກ້ວນໍາແສງ 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. ເຊັນເຊີອຸນຫະພູມຈຸດດຽວວັດແທກຈຸດທີ່ແນ່ນອນໃນພາກສະຫນາມອຸນຫະພູມດ້ວຍຄວາມແມ່ນຍໍາຂອງການວັດແທກສູງແລະຄວາມຫນ້າເຊື່ອຖື, ແຕ່ມັນເປັນການຍາກທີ່ຈະວັດແທກການແຜ່ກະຈາຍຂອງຈຸດຫຼາຍໃນພາກສະຫນາມອຸນຫະພູມ. To solve the measurement problem of multi-point distribution of temperature field, ເຊັນເຊີອຸນຫະພູມໃຍແກ້ວນໍາແສງທີ່ແຈກຢາຍ quasi ປະກອບດ້ວຍເຊັນເຊີອຸນຫະພູມໃຍແກ້ວນໍາແສງແບບ multiplexed ແລະ array ຂອງເຊັນເຊີອຸນຫະພູມໃຍແກ້ວນໍາແສງໄດ້ປະກົດອອກມາ.. 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, bandwidth, 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) Purpose: 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) Principles: Safe and reliable, easy to use, advanced technology, 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, ແລະອື່ນໆ, 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.