Why does the temperature of 10kV high-voltage distribution switchgear rise-INNO

Aufgrund der langen Stromversorgungsentfernung, mehrere Gerätekomponenten, hohe elektrische Belastung, and mostly continuous operation of 10kV distribution lines, the electrical equipment of substations that supply power to the lines has the characteristics of heavy load and high current during operation. Unter solchen Bedingungen, wenn sich die Verbindungsschrauben der Umspannwerksausrüstung lösen oder die Komponenten jedes Teils schlechten Kontakt haben, Durch den kontinuierlichen Hochstromdurchfluss steigt die Temperatur des Geräts ungewöhnlich stark an, Dies führt zu einer schlechten Materialleistung der elektrischen Ausrüstung. Wenn es nicht rechtzeitig erkannt und repariert wird, Durch Überhitzung und Schmelzen der Schweißpunkte der Geräte kann es zu schweren Unfällen kommen. Das heißt, beim Auftreten von Fehlern in Hochspannungsanlagen, es wird zu einem deutlichen Temperaturanstieg kommen. daher, Die Überwachung der Temperaturparameter von Hochspannungsgeräten während des Betriebs ist sehr wichtig.

Reasons for high pressure temperature rise

The fully enclosed electrical equipment of the substation refers to the combination of high-voltage components such as high-voltage circuit breakers, Trennschalter, und Transformatoren, which are installed in metal enclosed cabinets, such as combination electrical appliances and high-voltage switchgear. Beim Betrieb vollständig geschlossener elektrischer Geräte, wenn in der Innenausstattung des Schrankes eine Teilentladung auftritt, Dies kann zu einem abnormalen Temperaturanstieg am Leiteranschluss führen. Aufgrund der versteckten Heizposition, the operating personnel cannot detect it in a timely manner. This can easily expand the fault, causing electrical components to break down and burn out, and affecting adjacent equipment units, resulting in a malignant power outage accident.

The reason for the temperature rise of high-voltage circuit breakers is that the circuit breaker temperature is too high

During the normal operation of high-voltage circuit breakers, the energy generated by the long-term working current is converted into thermal energy, causing the temperature of electrical materials to rise but not exceed the specified range; When the conductive circuit is abnormal, it will cause the temperature of the electrical material to increase beyond the specified range, accelerate the oxidation of the dynamic and static contacts, increase the contact resistance, and further increase the heating temperature, resulting in a decrease in the mechanical and physical properties of the electrical material. When the temperature exceeds the melting point of the material, it will cause the two contacts to melt, ultimately leading to an electrical accident where the circuit breaker cannot be opened. Zum Beispiel, the metal armored enclosed switchgear in substations (switching stations) all use small car type circuit breakers. When the handcart plug is pushed in, if the force is not enough or not shaken in place, it will cause poor contact between the dynamic and static plugs, was zu Überhitzung führt. Während des Betriebs, the contact will melt, which can cause phase to phase short circuits and lead to a malignant accident of the overall switch burning.

The reason for the high temperature of the busbar is the temperature rise of the electrical contacts

The connection between various electrical equipment in the substation mainly relies on screws for crimping, as well as various methods such as connecting with the main busbar and branch busbar. Due to the limitation of voltage level, it is necessary to consider the requirements for safe distance to ground and the safe operation of connecting busbars. daher, an insulation sheath has been installed and enclosed. This makes the connecting wires between devices have many characteristics that are not conducive to operation, such as high installation distance from the ground and strong sealing. If the screws at the connection are not properly maintained or run for a long time, external factors such as wind force and vibration of electric power during operation can cause the screws to loosen and oxidize, Dies führt zu einer Überhitzung der Kontaktstellen am Sammelschienenanschluss durch zu hohe Übergangswiderstände, Dies kann zu einem bösartigen Unfall oder einem großflächigen Stromausfall im gesamten Umspannwerk oder im Abschnitt der Sammelschiene führen.