ວິທີການວັດແທກອຸນຫະພູມໃດທີ່ດີທີ່ສຸດສໍາລັບ capacitor

ເຊັນເຊີອຸນຫະພູມ Fiber optic, ລະບົບຕິດຕາມກວດກາອັດສະລິຍະ, ຜູ້ຜະລິດໃຍແກ້ວນໍາແສງແຈກຢາຍຢູ່ໃນປະເທດຈີນ

ເຊັນເຊີອຸນຫະພູມ Fiber optic not only have wide applications in the fields of switchgear temperature measurement, circuit breaker temperature measurement, and transformer temperature measurement, but also have characteristics such as insulation, ຕ້ານການແຊກແຊງ, and high voltage resistance that cannot be achieved by other traditional temperature sensors in capacitor temperature monitoring.

ປະຈຸບັນອຸປະກອນທະນາຄານ capacitor ຂະຫນານແຮງດັນສູງແມ່ນແຫຼ່ງພະລັງງານ reactive ທີ່ສໍາຄັນຫຼາຍໃນລະບົບພະລັງງານ., playing a crucial role in improving the power system structure and enhancing power quality. ຫນ້າທີ່ຕົ້ນຕໍແມ່ນການສະຫນອງພະລັງງານ reactive ກັບລະບົບພະລັງງານ, ຫຼຸດຜ່ອນການສູນເສຍສາຍ, ປັບປຸງຄຸນນະພາບແຮງດັນ, ແລະ​ເພີ່ມ​ທະ​ວີ​ການ​ນໍາ​ໃຊ້​ອຸ​ປະ​ກອນ​. As a type of reactive power compensation equipment, capacitors ພະລັງງານປົກກະຕິແລ້ວແມ່ນຖືກນໍາໃຊ້ໃນ substation ໂດຍຜ່ານການຊົດເຊີຍສູນກາງແຮງດັນສູງ. The compensation capacitors are connected to the 10kV or 35kV bus of the substation to compensate for the reactive power on all lines and transformers on the bus side of the substation. In use, they are often combined with on load tap changers to further improve the power quality of the power system.

The effect of temperature rise fault on high-voltage capacitors

Capacitors ມັກຈະພົບຄວາມຜິດຕ່າງໆໃນລະຫວ່າງການປະຕິບັດງານ, ຊຶ່ງ​ເປັນ​ໄພ​ຂົ່ມ​ຂູ່​ອັນ​ໃຫຍ່​ຫຼວງ​ຕໍ່​ການ​ເຮັດ​ວຽກ​ທີ່​ປອດ​ໄພ​ແລະ​ເປັນ​ປົກກະຕິ​ຂອງ​ລະບົບ​ໄຟຟ້າ. The common faults of capacitors in power operation include oil leakage, insulation ບໍ່ດີ, ແລະ fuses ເຜົາ. ໃນບັນດາພວກເຂົາ, the most harmful and frequently occurring faults are capacitor faults caused by heating. The heating caused by capacitor faults can be divided into heating at the busbar connection point and heating at the fuse outside the capacitor, ກັບອັນສຸດທ້າຍແມ່ນມັກຈະເກີດຂຶ້ນ. ໃນຊຸມປີມໍ່ໆມານີ້, in the daily operation of 35kV high-voltage parallel capacitor banks, equipment may experience abnormal temperature rise due to aging or high load current due to long operating years and construction and installation processes. ຖ້າສະຖານະການຜິດປົກກະຕິດັ່ງກ່າວບໍ່ໄດ້ຖືກກວດພົບແລະຈັດການກັບມັນໃຫ້ທັນເວລາ, it is easy to develop and expand, ນໍາໄປສູ່ຄວາມເສຍຫາຍຕໍ່ຕົວເກັບປະຈຸສ່ວນບຸກຄົນແລະແມ້ກະທັ້ງການລະເບີດຂອງກຸ່ມແລະການບາດເຈັບ. The failure rate is high, directly threatening the safety of 500kV power equipment and the personal safety of operation and maintenance personnel, resulting in significant voltage fluctuations in the power grid, ການເພີ່ມຂຶ້ນຂອງການສູນເສຍພະລັງງານທີ່ມີການເຄື່ອນໄຫວແລະປະຕິກິລິຍາ, reduced capacitor service life, and affecting the normal and stable operation of the power grid. capacitors ພະລັງງານສ່ວນໃຫຍ່ແມ່ນຖືກນໍາໃຊ້ສໍາລັບການຊົດເຊີຍພະລັງງານ reactive ໃນລະບົບພະລັງງານເພື່ອປັບປຸງປັດໄຈພະລັງງານ. In order to ensure its more reliable operation, the industry currently mainly considers connecting internal components of capacitors in series with internal fuses. When a capacitor experiences complete failure of its components due to a weak dielectric, the internal fuse connected in series with the component will act, causing only a portion of the damaged components to be isolated. capacitor ຈະສືບຕໍ່ດໍາເນີນການໂດຍມີພຽງແຕ່ພະລັງງານຫຼຸດລົງເລັກນ້ອຍ. ໃນຈຸດນີ້, ການລົບກວນໃນທະນາຄານ capacitor ສາມາດຖືກລະເລີຍ, and the total capacity of the capacitor bank will not be significantly affected by the action of a single fuse. The introduction of an internal fuse protects the capacitor components, but invisibly increases the number of fault points. Inside power capacitors, the internal fuse is the main heat source, but the volume and diameter of the internal fuse are very small (about 135mm in length and 0.45mm in diameter), and it is generally hidden between capacitor components. Due to current measurement techniques, it is difficult to accurately and objectively measure the surface temperature of the internal fuse under actual operating conditions.

Temperature monitoring of dry-type capacitors

ໃນປັດຈຸບັນ, oil immersed capacitors and dry capacitors are commonly used in the high-voltage field. The latter has the advantages of environmental protection, material saving, ຄ່າໃຊ້ຈ່າຍຕ່ໍາ, ຂະ​ບວນ​ການ​ງ່າຍ​ດາຍ​, ນ້ ຳ ໜັກ ເບົາ, ພື້ນທີ່ຂະຫນາດນ້ອຍ, ຜະ​ລິດ​ຕະ​ພັນ​ການ​ປິ່ນ​ປົວ​ດ້ວຍ​ຕົນ​ເອງ​, ການດໍາເນີນງານທີ່ເຊື່ອຖືໄດ້ຫຼາຍ, ຄວາມຕ້ານທານໄຟທີ່ດີ, less likely to produce high-pressure gas, ແລະ​ຫຼຸດ​ຜ່ອນ​ຄວາມ​ເປັນ​ໄປ​ໄດ້​ຂອງ​ການ​ລະ​ເບີດ​ຢ່າງ​ຫຼວງ​ຫຼາຍ​.
A dry capacitor consists of a capacitor core, casing, sleeve, ແລະອຸປະກອນເສີມອື່ນໆ. The capacitor core is composed of capacitor components and insulation components. Capacitor components are made by winding thin film insulation media and aluminum foil electrodes with a certain thickness and number of layers, or by depositing a layer of metal on the thin film to form a metallized film. ຫຼັງຈາກອົງປະກອບແມ່ນມ້ວນເຖິງ, they are loaded into the component shell, ແລະອົງປະກອບຂອງຕົວເກັບປະຈຸຫຼາຍແມ່ນເຊື່ອມຕໍ່ເປັນຊຸດຫຼືຂະຫນານເພື່ອສ້າງເປັນຫຼັກ capacitor ທັງຫມົດ.
Dry capacitors are usually used indoors or underground with poor ventilation conditions, ແລະການກະຈາຍຄວາມຮ້ອນພາຍໃນຂອງ capacitors ສາມາດອີງໃສ່ອາຍແກັສເທົ່ານັ້ນ. ເມື່ອປຽບທຽບກັບຕົວເກັບປະຈຸນ້ໍາມັນ, ຄ່າສໍາປະສິດການຖ່າຍທອດຄວາມຮ້ອນຂອງອາຍແກັສແມ່ນຕ່ໍາ, so the heat dissipation performance of dry capacitors is poor. These all have adverse effects on the operation of dry capacitors. The operation practice of the power system shows that the failure rate of capacitors is significantly higher from June to September each year than in other months. ໃນບາງພາກພື້ນ, the power industry stipulates that the hottest temperature of the core of a full film capacitor shall not exceed 80 ℃. ເມື່ອອຸນຫະພູມເກີນ 80 ℃, ການປະຕິບັດ insulation ຂອງຮູບເງົາ polypropylene (ໜັງ PP) ເປັນ dielectric ຈະຫຼຸດລົງ.
ໃນປັດຈຸບັນ, the temperature field of dry-type capacitors is generally measured using traditional temperature sensors to measure the temperature of the capacitor shell, and then calculate the internal temperature. This results in an error between the temperature value obtained and the distribution of the internal temperature field of the capacitor, which cannot accurately obtain the true temperature at the highest point.

ໃນປັດຈຸບັນ, the temperature measurement method for the internal protection of power capacitors includes a temperature rise test. ແນວໃດກໍ່ຕາມ, this test only estimates the temperature rise of the internal fuse by measuring the current and resistance of the internal fuse, which has poor accuracy. In the actual process of flowing the internal fuse, the resistance of the internal fuse will change with its temperature. ໃນອີກດ້ານຫນຶ່ງ, it is difficult to ensure its constant flow, and on the other hand, ການຕອບສະ ໜອງ ລະຫວ່າງຄວາມຕ້ານທານຂອງຟິວພາຍໃນແລະອຸນຫະພູມແມ່ນໃຊ້ໄດ້ພາຍໃນຂອບເຂດອຸນຫະພູມທີ່ແນ່ນອນເທົ່ານັ້ນ. ເກີນຂອບເຂດນີ້, ມັນຈະຍາກທີ່ຈະໄດ້ຮັບຜົນໄດ້ຮັບທີ່ຖືກຕ້ອງ. ເພາະສະນັ້ນ, ວິທີທາງອ້ອມຂອງການວັດແທກການເພີ່ມຂຶ້ນຂອງອຸນຫະພູມຂອງຟິວພາຍໃນໃນຕົວເກັບປະຈຸມີຂໍ້ຈໍາກັດແລະຄວາມຖືກຕ້ອງຕ່ໍາ.. ນອກຈາກນັ້ນ, the temperature rise of the internal fuse is measured through thermal resistance, but due to the fact that the thermal resistance is much larger in both volume and diameter than the internal fuse, it will have an impact on the actual temperature of the internal fuse during contact measurement, ສົ່ງຜົນໃຫ້ຄວາມຖືກຕ້ອງຂອງການວັດແທກຕໍ່າລົງ. ໃນທັດສະນະນີ້, it is necessary to design a simple and feasible measurement device to accurately grasp the temperature of the fuse inside the capacitor under actual operating conditions, ສະຫນອງພື້ນຖານສໍາລັບການອອກແບບແລະການຄັດເລືອກຂອງ fuse ພາຍໃນ capacitor ໄດ້, and effectively improve the reliability of the fuse protection action, ensuring that the temperature of the fuse will not cause damage to the internal insulation of the capacitor.

Disadvantages of infrared thermal imager temperature measurement

ໃນປັດຈຸບັນ, the thermal maintenance of capacitors mainly relies on infrared imaging equipment for inspection. ແນວໃດກໍ່ຕາມ, infrared thermal imaging cannot test the temperature in a closed environment, ແລະຜົນການທົດສອບໄດ້ຮັບຜົນກະທົບຈາກລະດູການ, ເວລາ, ແລະຄວາມລຽບດ້ານຂອງອຸປະກອນການທົດສອບ. ອຸປະກອນທົດສອບອິນຟາເລດມີລາຄາແພງ ແລະບໍ່ສາມາດຕິດຕາມອຸນຫະພູມຂອງອຸປະກອນໄຟຟ້າແຮງດັນສູງຢ່າງຕໍ່ເນື່ອງເປັນເວລາດົນ. There is high voltage on the capacitor, and there is strong electromagnetic interference around it, which often leads to false alarms or missed alarms in traditional detectors. ເພາະສະນັ້ນ, it is necessary to use highly reliable and high-performance temperature sensors to monitor the temperature of capacitors in real time and effectively, in order to avoid equipment burning and power outage accidents.

ນອກຈາກນັ້ນ, current temperature measurement equipment cannot detect the specific temperature inside the capacitor. capacitors ທີ່ມີຢູ່ແລ້ວໄດ້ຖືກນໍາໃຊ້ໃນສະພາບແວດລ້ອມທີ່ມີການປ່ຽນແປງອຸນຫະພູມທີ່ສໍາຄັນ. Prolonged use of capacitors under abnormal temperatures can seriously affect their service life and increase their damage rate.

Capacitor fiber optic temperature measurement system

FJINNO’s capacitor fluorescent fiber optic temperature measurement system not only solves the problem of traditional temperature sensors being unable to accurately measure the temperature of small internal fuses, but also solves the potential isolation between strong and weak currents, as well as the anti electromagnetic interference problem of data communication. It provides a good solution for comprehensively and accurately grasping the hot spot temperature of the core inside the capacitor.

ເຈົ້າພາບຕິດຕາມອຸນຫະພູມໃຍແກ້ວນໍາແສງມີອຸປະກອນເຕືອນໄພການວັດແທກອຸນຫະພູມ, ແລະຄອມພິວເຕີຕິດຕາມກວດກາເກັບກໍາຂໍ້ມູນອຸນຫະພູມທີ່ສົ່ງໂດຍ demodulator ສັນຍານອຸນຫະພູມໃຍແກ້ວນໍາແສງໂດຍຜ່ານພອດການສື່ສານ. Real time display of temperature data at various temperature measurement points, temperature alarm software provides graded monitoring, ຮູບແຕ້ມເສັ້ນໂຄ້ງອຸນຫະພູມ, ຈໍສະແດງຜົນການແຜ່ກະຈາຍອຸນຫະພູມ, ການສອບຖາມເສັ້ນໂຄ້ງປະຫວັດສາດ, report generation and printing functions;