Which temperature measurement method is best for capacitors

Fiberoptesch Temperatursensoren 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, Anti-Interferenz, and high voltage resistance that cannot be achieved by other traditional temperature sensors in capacitor temperature monitoring.

D'Héichspannung parallel capacitor Bank Apparat ass de Moment eng extrem wichteg reaktiv Muecht Quell am Muecht System, playing a crucial role in improving the power system structure and enhancing power quality. D'Haaptfunktioun ass d'Reaktiv Kraaft un de Stroumsystem ze liwweren, reduzéieren Linn Verloschter, Spannungsqualitéit verbesseren, an d'Ausrüstungsnotzung erhéijen. As a type of reactive power compensation equipment, Muecht capacitors sinn normalerweis an substations duerch héich-Volt zentraliséiert Kompensatioun benotzt. 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

Kondensatoren begéinen dacks verschidde Feeler wärend der Operatioun, déi eng bedeitend Bedrohung fir déi sécher an normal Operatioun vum Stroumsystem stellen. The common faults of capacitors in power operation include oil leakage, schlecht Isolatioun, a verbrannt Sicherungen. Ënnert hinnen, déi schiedlechst an dacks optriedend Feeler sinn Kondensatorfehler déi duerch Heizung verursaacht ginn. The heating caused by capacitor faults can be divided into heating at the busbar connection point and heating at the fuse outside the capacitor, mat der leschter méi wahrscheinlech geschéien. An de leschte Joren, 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. Wann esou anormal Situatiounen net erkannt a fristgerecht behandelt ginn, it is easy to develop and expand, féiert zu Schied un eenzelne Kondensatoren a souguer Gruppexplosiounen a Verletzungen. 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, erhéicht aktiv a reaktiv Kraaftverloscht, reduced capacitor service life, and affecting the normal and stable operation of the power grid. Power capacitors sinn haaptsächlech fir reaktiv Muecht Kompensatioun an Muecht Systemer benotzt Muecht Faktor ze verbesseren. 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. De Kondensator wäert weider mat nëmmen enger liicht Ofsenkung vun der Kraaft schaffen. Op dësem Punkt, d'Stéierung an der capacitor Bank kann ignoréiert ginn, and the total capacity of the capacitor bank will not be significantly affected by the action of a single fuse. D'Aféierung vun enger interner Sicherung schützt d'Kondensatorkomponenten, but invisibly increases the number of fault points. Bannen Muecht capacitors, the internal fuse is the main heat source, but the volume and diameter of the internal fuse are very small (ongeféier 135 mm laang an 0,45 mm Duerchmiesser), an et ass allgemeng tëscht capacitor Komponente verstoppt. Due to current measurement techniques, et ass schwéier präziist an objektiv d'Uewerflächentemperatur vun der interner Sicherung ënner aktuellen Operatiounsbedingungen ze moossen.

Temperature monitoring of dry-type capacitors

Am Moment, oil immersed capacitors and dry capacitors are commonly used in the high-voltage field. Déi lescht huet d'Virdeeler vum Ëmweltschutz, Material spueren, niddreg Käschten, einfache Prozess, liicht Gewiicht, klenge Beräich, Selbsthelenden Produkt, méi zouverlässeg Operatioun, gutt Feier Resistenz, less likely to produce high-pressure gas, a staark reduzéiert d'Méiglechkeet vun explosive Gefore.
A dry capacitor consists of a capacitor core, casing, sleeve, an aner Accessoiren. 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. Nodeems d'Komponente opgerullt sinn, they are loaded into the component shell, a verschidde Kondensatorkomponenten sinn a Serie oder parallel verbonne fir de ganze Kondensatorkär ze bilden.
Dry capacitors are usually used indoors or underground with poor ventilation conditions, an déi intern Wärmevergëftung vu Kondensatoren kann nëmmen op Gas vertrauen. Am Verglach mat Ueleg ënnerdaach capacitors, den Wärmetransferkoeffizient vum Gas ass manner, 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. An e puer Regiounen, the power industry stipulates that the hottest temperature of the core of a full film capacitor shall not exceed 80 ℃. Wann d'Temperatur iwwerschratt 80 ℃, der Isolatioun Leeschtung vun polypropylene Film (PP Film) als dielectric wäert erofgoen.
Am Moment, 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.

Am Moment, the temperature measurement method for the internal protection of power capacitors includes a temperature rise test. Allerdéngs, 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. Op der enger Säit, it is difficult to ensure its constant flow, and on the other hand, D'Korrespondenz tëscht der Resistenz vun der interner Sicherung an der Temperatur ass nëmmen an engem bestëmmten Temperaturbereich applicabel. Doriwwer eraus dëser Gamme, et wäert schwéier ginn genee Resultater ze kréien. Dofir, Dës indirekt Method fir d'Temperaturerhéijung vun der interner Sicherung an de Kondensatoren ze moossen huet Aschränkungen a geréng Genauegkeet. Zousätzlech, 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, wat zu enger schlechter Miessgenauegkeet resultéiert. Am Hibléck vun dëser, 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, eng Basis fir den Design an d'Auswiel vun der Sicherung am Kondensator ze bidden, 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

Am Moment, the thermal maintenance of capacitors mainly relies on infrared imaging equipment for inspection. Allerdéngs, Infrarout thermesch Imaging kann d'Temperatur net an engem zouenen Ëmfeld testen, an d'Testresultater si vun der Saison beaflosst, Zäit, an Uewerfläch glatt vun der Test Equipement. Infrarout Testausrüstung ass deier a kann d'Temperatur vun Héichspannungsausrüstung fir eng laang Zäit net kontinuéierlech iwwerwaachen. Et gëtt héich Spannung um Kondensator, an et gëtt staark elektromagnetesch Interferenz ronderëm, wat dacks zu falschen Alarmer oder vermësste Alarmer an traditionelle Detektoren féiert. Dofir, et ass néideg héich zouverlässeg an héich-Performance Temperatur Sensoren ze benotzen der Temperatur vun capacitors an Echtzäit an effektiv ze kontrolléieren, fir Ausrüstungsverbrennung a Stroumausfall Accidenter ze vermeiden.

Zousätzlech, aktuell Temperaturmiessungsausrüstung kann déi spezifesch Temperatur am Kondensator net erkennen. Déi existent Kondensatore ginn an Ëmfeld mat bedeitende Temperaturännerungen benotzt. Prolonged use of capacitors under abnormal temperatures can seriously affect their service life and increase their damage rate.

Kondensator Glasfaser Temperaturmessungssystem

FJINNO’s capacitor fluoreszent Glasfasertemperaturmessungssystem 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.

De Glasfasertemperatur Iwwerwaachungshost ass mat Temperaturmessungsalarm Software ausgestatt, an d'Iwwerwaachungscomputer sammelt Temperaturinformatioun, déi vum Glasfasertemperatursignaldemodulator iwwer de Kommunikatiounsport iwwerdroe gëtt. Real time display of temperature data at various temperature measurement points, temperature alarm software provides graded monitoring, Temperaturkurve Zeechnen, Temperaturverdeelungsdisplay, historesch Curve Ufro, report generation and printing functions;

Fiberoptesch Temperatursensor, Intelligent Iwwerwachung System, Verdeelt Léngen OPTIC Hiersteller a China