What will happen if the contact of the high-voltage switchgear heats up-INNO

Ang kaugnayan sa pagitan ng mga sanhi ng mga fault sa high-voltage switchgear at ang pag-init ng mga contact

Ang high voltage switchgear ay kailangang-kailangan sa lahat ng aspeto ng produksyon, paghawa, panustos, at paggamit ng elektrikal na enerhiya, na may napakataas na rate ng paggamit. Ang transmission, pamamahagi, at ang pagsasaayos ng elektrikal na enerhiya ay maaaring makamit sa pamamagitan ng high-voltage switchgear, na may mataas na posisyon sa iba't ibang aspeto na may kaugnayan sa elektrikal na enerhiya. Ang pangunahing salik sa kung ligtas at matatag nitong makamit ang mga pag-andar na ito ay kung ang kapaligiran ng pakikipag-ugnayan ng electromagnetic sa loob ay matatag. Kaya, kung ang high-voltage switchgear ay nasa mataas na estado ng init at ang propesyonal na paghawak nito ay hindi sapat sa oras, magdudulot ito ng mga seryosong pagkakamali sa high-voltage switchgear, na magkakaroon ng malaking epekto sa iba't ibang aspeto ng elektrikal na enerhiya. According to the statistical results of past faults in high-voltage switchgear, it can be seen that the main cause of faults is their contacts. If a heating type fault occurs, it not only causes serious damage to the working performance of the facility itself, but also due to the complexity of its internal structure, the repair time will be long, affecting normal use and restricting the economic development related to electricity. The process of heating failure in facilities is accumulated over time, such as being in an abnormal operating environment for a long time or damage to its own structure, which can cause a sudden increase in the temperature of its contacts. An in-depth analysis is conducted on the actual situation of heating faults in high-voltage switchgear, gayundin ang mga sanhi at kaukulang mga hakbang sa pag-iwas.

Ano ang mangyayari kung uminit ang contact ng high-voltage switchgear

Sa kasalukuyan, maraming high-voltage switchgear cabinet na ginagamit sa industriya ng kuryente ay mga pasilidad ng supply ng kuryente para sa pagsasaayos ng uri ng kotse, na may kumpletong mga pag-andar at mahusay na pagganap ng trabaho. Batay sa mga nakaraang operasyon sa trabaho, makikita na ang pinaka-karaniwang malfunction ng maliit na uri ng kotse na pagsasaayos ng power supply facility ay sanhi ng pag-init ng mga contact nito. Ang contact heating na nagiging sanhi ng pagkabigo ng kagamitan ay isang serye ng mga proseso, hindi biglaan, ngunit sanhi ng pangmatagalang maling operasyon ng pasilidad o pinsala sa mga bahagi ng pasilidad mismo. Ang posibilidad na mangyari ang hindi pangkaraniwang bagay na ito ay napakataas, na humahantong sa isang makabuluhang epekto sa pag-unlad ng ekonomiya ng iba't ibang larangan na may kaugnayan sa produksyon ng kuryente, panustos, and industrial and agricultural production. Its adverse effects mainly include the following:
Una, increase the number of damaged facilities. If the contacts of the facilities do not generate heat in a timely manner and corresponding measures are not taken, it will lead to the gradual accumulation of heat from the contacts, which will be transmitted to other components of the facilities through copper busbar components, causing damage to the insulation parts between the facilities, leading to the occurrence of insulation breakdown accidents. There is also a high probability of causing serious facility damage accidents such as explosion damage to high-voltage insulation components, melting and deformation of various connecting wires, and explosion and fire of similar current sensors.
Pangalawa, the maintenance cycle of the facilities is too long. The internal structure of the small car type high-voltage switchgear is completely enclosed, and the variable frequency distribution equipment is disposable. If the facility malfunctions or is damaged due to heating, it needs to be completely powered off during maintenance, and multiple components need to be replaced, including the inner contacts, insulation components, auxiliary switches, atbp. The space inside the high-voltage switchgear is very small, making maintenance and replacement very laborious, resulting in a long maintenance cycle of the facilities. Due to the constant power outage environment during maintenance, the power supply system is very unstable. Pangatlo, it causes significant economic losses to the enterprise. If the high-voltage switchgear malfunctions or is damaged due to heating, it will not only cause significant economic losses to the power enterprise, but also lower the overall evaluation index of the power enterprise. Sudden power outages can also cause damage to many mechanical facilities, damage to production products, and confusion in production processes.

What are the reasons for contact heating in high-voltage switchgear

（1） The tension of the fixed spring on the outer edge of the plum blossom contact is insufficient
The fixed spring on the outer edge of the plum blossom type contact usually has insufficient tension due to factors such as its own material or not selecting a suitable model according to the joint form. The spring coil is not tight, and the resistance received by the contact increases, making the contact extremely prone to heating; After the contact heats up, the spring also heats up, and the elasticity of the spring coil increases, causing the heat of the contact to increase. If the contact heating phenomenon is caused by this reason, the edge spring and plum blossom contact should be replaced in a timely manner, and the truly suitable plum blossom contact made of excellent materials should be selected according to the joint situation. The tension of the edge spring should not be missed during the scheduled maintenance period of the circuit cutting facility.

（2） The connection between the transmission arm and the plum blossom contact is loose
Ang mga contact ng plum blossom na naka-configure sa mga pasilidad ng paggupit ng circuit ay kadalasang konektado sa pamamagitan ng mga transmission arm at bolts. Sa araw-araw na gawain, dahil sa impluwensya ng kuryente at iba pang mga kadahilanan, madali para sa mga bolts ng istraktura ng koneksyon na lumuwag sa iba't ibang antas, nagiging sanhi ng pagtaas ng natanggap na electrical resistance, at ang temperatura ng konektadong bahagi ay tumaas. Pagkatapos ay inililipat ang init sa mga contact ng plum blossom, nagiging sanhi ng pagtaas ng temperatura ng nakapirming spring. Kung ang nakapirming spring ay palaging nasa ganitong estado ng pagpapatakbo, ang pag-igting ng nakapirming spring ay hindi magiging sapat, at ang spring spiral body ay hindi masikip, humahantong sa paglitaw ng plum blossom contact thermal aksidente. Sa panahon ng pagpapanatili, it was noticed that both the fixed spring and the plum blossom contact in a high load cut-off circuit facility had blackened and heated up. Further inspection revealed that the connecting positions of the power transmission arm and the plum blossom contact were severely loose. The plum blossom contact showed a sliding ring phenomenon with a light touch. After reinforcing the bolts connecting the plum blossom contact and the power transmission arm, the overall heating problem was effectively controlled. For the heating phenomenon caused by problems in the connected part, it is necessary to strictly check whether there is any looseness in the connecting part between the plum blossom contact and the power transmission arm during the scheduled maintenance period of the circuit cutting facilities. If there is any looseness, it should be reinforced in a timely manner.

（3） The material of the fixed spring on the outer edge of the plum blossom contact does not meet the standard requirements
According to the design and practical application requirements of high-voltage switchgear, the fixed spring material on the outer edge of the plum blossom contact must be non-conductive magnetic material. Ang pagpili ng materyal na ito ay maaaring epektibong maiwasan ang heating phenomenon na dulot ng vortex flow ng pagdadala ng kasalukuyang sa nakapirming spring sa panahon ng normal na operasyon.. Ang pag-init ay magpapataas ng pagkalastiko ng nakapirming tagsibol, bawasan ang tensyon, at hindi sapat ang paghigpit ng puwersa ng spiral body, na nagreresulta sa pagtaas ng electrical resistance, nagiging sanhi ng pagdikit ng plum blossom upang maging itim at mainit, at sa malalang kaso, maaaring mangyari ang pinsala. Para sa hindi pangkaraniwang bagay ng pag-init na sanhi ng hindi tamang pagpili ng mga nakapirming materyales sa tagsibol, kinakailangang hilingin na ang nakapirming spring material sa panlabas na gilid ng contact ay non-conductive magnetic material kapag pumipili ng high-voltage switchgear o bumibili ng plum blossom contact component upang maiwasan ang paglitaw ng heating phenomenon.

（4） Poor contact between the stationary contacts of the switchgear and the dynamic contacts of the circuit breaker facilities
The reason for this phenomenon is that during the installation process of the switchgear, the accuracy is insufficient or the precision of the various components of the produced switchgear cannot meet the actual set standards, resulting in varying degrees of displacement of the fixed contacts of the switchgear, leading to poor contact between the fixed contacts of the switchgear and the dynamic contacts of the circuit breaker facilities. Kasabay nito, mismatched models of backup circuit breaker facilities can also cause this phenomenon to occur. For the phenomenon of poor contact between fixed and dynamic contacts, the production enterprise should first be required to strictly control the accuracy and installation technology of various components of the switchgear. When installing fixed and dynamic contacts, dapat pumili ng isang modelo na ganap na tumutugma sa switchgear. Kung kinakailangan na gumamit ng mga backup na cut-off circuit facility na may iba't ibang mga modelo sa panahon ng aktwal na operasyon, ang unang hakbang ay upang matiyak na ang steady-state at static na mga contact ay maaaring magsagawa ng contact nang maayos, at upang mahigpit na kontrolin ang halaga ng paglaban sa koneksyon.
Sa pang-araw-araw na gawain ng iba't ibang pasilidad na may kaugnayan sa kuryente, kailangan munang iwasan ang pag-init ng mga contact ng high-voltage switchgear. Kung ang kontak ay bumubuo ng init, magkakaroon ito ng malaking epekto sa kapasidad ng pagkarga ng buong sistema ng elektrikal na enerhiya, at sa malalang kaso, maaari pa itong humantong sa pinsala sa high-voltage switchgear, mga pasilidad ng circuit breaker, atbp. Ang mga napapanahong hakbang ay dapat gawin upang matugunan ang mga tiyak na dahilan para sa pagtaas ng temperatura ng contact ng switchgear, in order to minimize the adverse consequences caused by heating. Kasabay nito, it is necessary to use the pagsukat ng temperatura device of the switchgear to monitor the temperature of the switchgear contacts in real-time, fundamentally reducing the incidence of heating accidents.