SL400 Vacuum Contactor Ba Tana Iya Kusa? Tashin Inganci na Sababubbi da Bambanta

A cikin sana'ar jirgin kula masu sauran kula na tattalin arzikin kula, ana amfani da jirgin kula masu sauran vacuum don bayyana tashoshin kula masu sauran, transforma, frequency converters, da sauransu daban-daban. Wannan yana ba da aiki mai zurfi da kuma aiki mai gaba-gaba, saboda haka ya samu amfani da shi a fagen. Idan abubuwa na jirgin kula masu sauran vacuum ba a barin zuwa rike, zai haifar da aiki mai kyau da kula masu sauran a cikin tattalin arzikin kula.

Daga cikin jirgin kula masu sauran vacuum a cikin sana'ar jirgin kula masu sauran Units 3 da 4 ta wakar tattalin arziki, akwai 60 SL400-type 400A jirgin kula masu sauran vacuum. Daga lokacin da suka fara aiki a shekarar 2015 zuwa tsakiyar 2016, akwai wasu jirgin kula masu sauran vacuum a cikin sana'ar jirgin kula masu sauran coal handling sun faru abubuwa kamar tripping mechanism refusal to trip, tripping coil burnout, da kuma activation of the "control circuit disconnection" alarm signal, wanda ya haifar da wannan aiki bai iya rufe ba. Saboda daya na nuna na tripping coil yana haɗa da negative electrode, yana iya haifar da direct grounding of the DC negative electrode, wanda yake haifar da protection device failure to operate da kuma tufafi mai yawa ga aiki mai kyau. Amma, idan an bukata aiki mai zurfi domin aiki mai gaba-gaba, yana haifar da tufafi mai yawa ga mafi girman aiki.

1. Muhimmin Ingantaccen Aikinsa

Muhimmin ingantaccen aikinsa na SL-400 type jirgin kula masu sauran vacuum da aka zabi a cikin wakar tattalin arziki shine mechanical holding-type mechanism. Idan closing coil na jirgin kula masu sauran vacuum ya fara aiki, closing moving iron core ya yi aiki a kan main shaft mechanism ta hanyar electromagnetic force. Roller a cikin closing moving iron core ya haɗa da tripping detent, wanda ke lock executive component don iya ba jirgin kula masu sauran vacuum yake a cikin hali na closed. Amma, spring ya haɗa da energy masu tripping, da kuma tripping detent connecting piece da tripping electromagnet bending plate suka zama a cikin hali na ready for tripping.

Idan tripping coil ya fara aiki da pulse power supply, tripping moving iron core ya haɗa da bending plate ta hanyar motion downward. Bending plate ya haɗa da tripping detent connecting piece, wanda ke release dead-center position da closing moving iron core roller da tripping detent ke bincika. Ta hanyar spring, rapid tripping ya faru. Closing moving iron core, da tripping spring ya haɗa da shi, ya yi aiki a kan main shaft zuwa limit plate da kuma stop, wanda ke samun tripping process.

2. Tabbacin Abubuwan Da Suke Faru

2.1 Fanni Electrical

Idan an yi tabbaci a cikin tripping circuit, akwai contact resistance na secondary plug, auxiliary contacts of the position vacuum contactor, da kuma operation handle contacts yana cikin hali na normal. DC output voltage yana cikin hali na approximately 110V, da kuma ba a nan ba a lalle low voltage on the tripping coil. Ba a nan ba a lalle poor insulation grounding in the control circuit ko loose/worn wires.

Tripping control circuit disconnection shine alarm signal wanda ya faru saboda tripping of the control power vacuum contactor da kuma burnout of the tripping coil. Saboda haka, idan SL contactor ya faru tripping refusal, za a iya rubuta abubuwan electrical.

2.2 Fanni Mechanical

Ingantaccen material design na tripping detent connecting piece: Material na original tripping detent, tripping electromagnet bending plate, da kuma connecting piece shine carbon steel, wanda yana da magnetic field. Ba a nan ba a lalle multiple energization and tripping operations, bending plate da connecting piece suka zama gradually magnetized by the magnetic field generated by the coil during the tripping process, wanda ke increase mechanical resistance of tripping. Idan tripping failure ya faru da kuma a yi aiki mai gaba-gaba, tripping coil zai yan burnout.

Residual magnetism a cikin tripping coil after energization: Wannan yana haifar da decrease in the magnetic flux of the tripping coil, wanda ke result in insufficient tripping torque da kuma unreliable tripping. Aiki mai gaba-gaba zai haifar da tripping coil ya fara aiki for a long time, generating heat and eventually burning out.

Mechanical jamming between the tripping detent and the positioning roller: Rotating parts ba su da lubricating grease. Burrs a cikin movable parts of the bending plate positioning hole da kuma positioning rod, ko deviation of the positioning hole due to wear, zai haifar da jamming. Ba a nan ba a lalle multiple operations of the tripping electromagnet, tripping friction resistance ya zama gradually increases, wanda ke haifar da overload and burnout of the tripping coil.

Frequent startup and shutdown of equipment: Coal handling belt conveyors da kuma coal crushers shine equipment wanda suke faru aiki mai gaba-gaba. Idan tripping refusal fault ya faru, wannan devices suka yi aiki more than 500 times. Tripping coil ba a nan ba a lalle energized and generates heat, wanda ke accelerate the insulation aging of the coil to a certain extent.

3. Hukumar Lissafin Abubuwan

Material replacement for key components: Replace the material of the tripping detent connecting piece from carbon steel to non-magnetic stainless steel, and replace the fixed screws from galvanized carbon steel to copper screws. This prevents the connecting piece from being magnetized, significantly reduces the mechanical resistance of tripping, and thereby reduces the consumption of tripping energy.

Demagnetization of core components: Demagnetize the tripping electromagnet base plate and bending plate using the tapping method before installation. This further reduces the attractive resistance between these components and the tripping detent connecting piece, increases the tripping force margin, and ensures reliable closing and tripping of the contactor.

Localization transformation of the original coil: Replace the original coil with one with a resistance of approximately 20Ω, increase the number of coil turns to enhance magnetic flux, and maintain the electromagnetic force of the coil operation above a certain value. At the same time, the increased resistance of the tripping circuit reduces the circuit current, lowers the heat generation of the coil during energization, slows down the coil aging rate, and effectively reduces the tripping refusal phenomenon caused by the decrease in tripping coil voltage due to increased contact resistance from burnout and oxidation of auxiliary contacts.

Lubrication and maintenance of mechanical parts: Apply lubricating grease to the tripping detent and positioning roller of the vacuum contactor, as well as the rotating parts of the tripping detent. Polish and trim the burrs and worn parts in the movable parts of the bending plate positioning hole, and perform lubrication and maintenance on the rotating parts of the tripping detent connecting piece. After the minimum tripping action voltage test, the action value is basically controlled between 45V and 55V, keeping the tripping mechanism in good condition and greatly improving the safety and reliability of tripping.

4. Hukumomin Kiyasin Abubuwan

• Regular maintenance and testing: Conduct minor maintenance once a year and major maintenance once every five years after normal operation, and properly perform mechanism maintenance and preventive tests.

• Strict equipment selection and acceptance: Ensure proper selection of vacuum contactor equipment, and strictly control the quality of commissioning, handover, and acceptance.

• Real-time operation monitoring: Strengthen monitoring during operation to promptly identify and handle problems.

• Optimize maintenance procedures: Further grasp the actual conditions of the equipment, and revise and improve the maintenance process procedures based on fault handling methods and experience.

• Strengthen inspection and management of frequently operated equipment: Enhance the inspection and management intensity of vacuum contactors in frequently operated equipment.

• Focus on mechanical part inspection: Pay attention to inspecting the vacuum contactor's mechanical parts, including checking whether the operating mechanism is well-lubricated, operates flexibly, and has no jamming. Special attention should be paid to checking for jamming between the tripping electromagnet bending plate and the tripping detent connecting piece.

• Utilize unit shutdown periods for maintenance: Make full use of the unit shutdown and standby periods to perform maintenance on the vacuum contactor mechanism and conduct preventive tests such as the closing and tripping coil action voltage test. This helps grasp the deterioration trend and promptly adjust and handle potential issues.

5. Nema

Jirgin kula masu sauran vacuum ba da aiki a cikin hali na handled suka fara aiki for nearly one year without any faults such as tripping refusal or coil burnout. Power plant ta yi tabbacin jirgin kula masu sauran vacuum a cikin sana'ar jirgin kula masu sauran coal handling wanda suke faru aiki new 500 to 1,000 operations and conducted the minimum tripping action voltage test. The results showed that the DC resistance and insulation of the tripping coils were in good condition, the action voltage value did not increase significantly, and the on-site/remote electric tripping tests were accurate and reliable. This has greatly improved the health level and reliability of the equipment, while reducing maintenance workload and saving maintenance costs.