LW12-500 Dead tank Circuit Breakers Dukanin da Tattalin Karamin Matsayinƙa da Ƙarfin Saiya

Makaranta

LW12 - 500 tank - type SF₆ circuit breaker shi ne tashin kawo mai kyau a fadin. Idan lokacin da ake yi zama da yawan daɗi, yanayi na mafi muhimmanci da take da jikin da ke yi aiki da kuma yanayi na takardun da ke yi aiki suka sa shi a kan tsari da hukumomi da cewa ake yi aiki. Wannan ya haɗa da abin da ake amfani da shi a kan hukumomin rarrabbin jiha, kuma ya haɗa da adadin da ake yi karatuwa da shi tun daga shekaru zuwa shekara. Daga baya, wannan rubutu ya ba da bayanai game da abubuwan da suka faruwa da kuma yanayin da suka faruwa a kan LW12 - 500 tank - type SF₆ circuit breaker, kuma ya ba da bayanan da za su iya amfani da su don in kula da abubuwan da suka faruwa da kuma in samun hukumomin da ake yi aiki da shi, don haka in kula da abubuwan da suka faruwa da kuma in samun hukumomin da ake yi aiki da shi.

Bayanai Game Da Tururun

LW12 - 500 tank - type SF₆ circuit breaker an amfani da gasar SF₆ a kan hanyar ingantaccen da kuma hanyar kula da sana'ar wata. Akan yanayin da ke yi aiki an amfani da ci gaba mai sauƙi, kuma abubuwan da masu muhimmanci a kan yanayin mai sauƙi ana fitowa daga Hitachi. Tururun ya taka da kungiyoyin dole biyu, kuma an fitowa kungiyoyin dole biyu a kan farkon da kuma karamin dole. Kungiyoyin dole biyu an fitowa daga Murata Company ta Japan.

Tsari Na Tururun

Akwai tururun da suka fiye da LW12 - 500 tank - type SF₆ circuit breaker a kan State Grid Corporation system. Harshe na 2014, akwai 33 tururun da suke fiye a kan Jibei Company, to suna 14 ne suke da sauran cin kala, kuma lokacin da suke yi aiki ≥10 shekara.

Yanayin Da Suka Faruwa A Kan Tururun

• A watan Satumba na 2002, an faruwa single - phase grounding fault a kan phase B ta LW12 - 500 tank - type SF₆ circuit breaker. Phase B ta breakers 5031 da 5032 a kan wata substation ta faruwa. Phase B ta breaker 5032 ta faruwa da nasarar, amma phase B ta breaker 5031 ta faruwa da batu. A nan, an samun cewa saboda yin maye da adjusting nut ta pressure switch, closing lock pressure value ta faruwa, kuma tana ba shi da nasarar don in faruwa da nasarar.

• Daga watan Afrilu zuwa watan Yuni na 2004, a lokacin da ake yi karatuwa da kuma ake yi pre - testing, LW12 - 500 tank - type SF₆ circuit breakers 5053, 5043 da 5012 a kan wata substation ta faruwa da yanayin da suke faruwa. A nan, an samun cewa saboda yin maye da hydraulic oil a kan yanayin da ke yi aiki, tana ba shi da nasarar don in faruwa da nasarar.

• A watan Yuni na 2004, a lokacin da ake yi aiki, phase C ta LW12 - 500 tank - type SF₆ circuit breaker 5052 a kan wata substation ta faruwa da yanayin da suke faruwa saboda yin maye da silver - plating layer ta pressure cylinder a kan arc extinguish chamber.

• A watan Yuli na 2005, a lokacin da ake yi normal power - off opening operation a kan LW12 - 500 tank - type SF₆ circuit breaker 5043, rotating shaft pin ta opening trip latch ta karamin opening electromagnet ta phase B ta yanayin da ke yi aiki ta kusa, kuma tana ba shi da nasarar don in faruwa da nasarar. Daga baya, series resistance ta opening circuit ta faruwa da kuma tana kusa. A nan, ba a nan da aka faruwa da latches, opening coil da kuma opening series resistance, a nan an faruwa shi a kan aiki.

• A watan Yuli na 2005, a lokacin da ake yi power-on a kan 2# busbar a kan wata substation, phase C ta LW12 - 500 tank - type SF₆ circuit breaker 5053 ta faruwa saboda striker rod ta kusa, kuma tana ba shi da nasarar don in faruwa da nasarar. Ba a nan da aka faruwa da striker rod, a nan an faruwa shi a kan aiki.

• A watan Mayu na 2006, saboda yin maye da continuous tripping faults a kan wata line, closing coil ta phase B ta LW12 - 500 tank - type SF₆ circuit breaker 5012 ta faruwa. A nan, an samun cewa saboda yin maye da closing latch ta phase B, tana ba shi da nasarar don in faruwa da nasarar.

• A watan Yuli na 2007, internal discharge fault ta faruwa a kan phase B ta LW12 - 500 tank - type SF₆ circuit breaker 5031 a kan wata substation. Saboda yin maye da painting process (manual brushing) ta conductive rod a kan bushing. Saboda yin maye da painting, brush bristles ta faruwa a kan conductive rod, kuma tana kusa a kan shield, kuma tana ba shi da nasarar don in faruwa da nasarar.

• A watan Nofember na 2007, a lokacin da an faruwa fault a Substation 3#, LW12-500 tank-type SF₆ circuit breaker 5013 ta faruwa da multiple opening and closing failures, kuma tana haɗa da shi a kan aiki.

• A watan Fabrairu na 2009, a lokacin da an yi protection actuation test a kan LW12-500 tank-type SF₆ circuit breaker 5012, phase C ta faruwa da batu. A nan, an samun cewa shaft ta connecting closing latch da buckle ta mechanism ta kusa, kuma tana ba shi da nasarar don in faruwa da nasarar.

• A watan Yuli na 2009, internal flashover ta faruwa a kan phase A ta LW12-500 tank-type SF₆ circuit breaker 5021 a lokacin da an yi power transmission. Saboda yin maye da sharp corners a kan shield assembly da kuma unclean interior a kan tank.

• A watan Marta na 2012, a lokacin da an yi opening, phase A ta LW12-500 tank-type SF₆ circuit breaker 5053 ta faruwa da interrupter breakdown, kuma tana haɗa da ground fault. A nan, an samun cewa saboda yin maye da parallel capacitor plates between the interrupters, tana kusa, kuma tana ba shi da nasarar don in faruwa da nasarar.

• A watan Janairu na 2013, a lokacin da an yi opening, phase B ta LW12-500 tank-type SF₆ circuit breaker 5043 ta faruwa da interrupter breakdown, kuma tana haɗa da ground fault; 12-second arc ta phase A ta clear by the bus differential protection before developing into a ground fault. Saboda yin maye da parallel capacitor plates between the interrupters, tana kusa, kuma tana ba shi da nasarar don in faruwa da nasarar.

Abubuwan Da Suka Faruwa

• Tururun da ake fitowa a lokacin da ake faruwa suna da yin maye da insulation paint application a kan conductive rod inside the bushing (manual brushing process), wanda ya ba da shi hidden hazards of internal insulation discharge saboda yin maye da brush bristles, delamination, da kuma peeling of the paint.

• Internal surface ta tank ta da yin maye da insulation paint workmanship, wanda ya ba da shi delamination and peeling, kuma tana ba shi da nasarar don in faruwa da nasarar; grading shield ta tank ta da yin maye da machining and assembly, wanda ya taka da sharp corners and protrusions.

• Silver-plated layer ta inner surface ta arc extinguish chamber's pressure cylinder ta da yin maye da delamination and peeling.

• Poor alignment of moving and stationary contacts or low-quality contact springs ta ba shi da nasarar don in faruwa da nasarar, kuma tana ba shi da fragmentation and shedding of arc contact fingers and nozzles.

• Degradation of parallel capacitor plates between interrupters ta ba shi da nasarar don in faruwa da nasarar, kuma tana ba shi da risks of insulation breakdown.

• Unreasonable design of mechanism heating and sealing systems ta ba shi da nasarar don in faruwa da nasarar, kuma tana ba shi da ultra-high oil pressure alarms in multiple circuit breakers during seasonal transitions.

• Frequent hydraulic mechanism failures, particularly high damage rates of seals and pressure accumulators, ta ba shi da nasarar don in faruwa da nasarar:

• Multiple occurrences of "immediate reclosure after opening" or "continuous tripping" saboda yin maye da hydraulic mechanism's primary valve;

• Severe degradation of hydraulic oil, leading to frequent pressurization and oil leakage;

• Insufficient strength and prone-to-fracture/deformation of some metal parts (e.g., latches) in the operating mechanism due to poor material or machining quality;

• Quality issues with pressure accumulators, causing pre-charged pressure drops in multiple units that failed to meet operational requirements after prolonged operation.

Retrofit Measures

The implemented maintenance measures for LW12-500 circuit breakers include:

• Replacing the conductive rod inside the bushing with a new type featuring advanced insulation coating technology.

• Thorough internal inspection and maintenance of the tank: focusing on checking the internal paint layer, closing resistor assembly, silver-plated layer of the pressure cylinder (replaced if delaminated/peeled), and alignment adjustment of moving/stationary contacts.

• Inspection and maintenance of the operating mechanism: including valve systems, pressure accumulators, working cylinders, hydraulic pumps, and complete replacement of hydraulic oil.

• Replacing interrupter parallel capacitor plates with improved-process components provided by Japan's Murata Corporation.

Suggested Improvement Measures

• To ensure power grid safety and stability, timely maintenance of LW12-type circuit breakers is crucial. However, challenges in spare parts supply and technical services—compounded by the breaker's long-term discontinuation and poor spare parts availability—have made maintenance difficult, with high single-unit overhaul costs approaching those of purchasing new breakers. Considering safety, economy, and technological advancement, overall replacement of LW12-500 tank-type SF₆ circuit breakers is recommended.

• Before retirement, strengthen operational condition monitoring and maintenance of LW12-type breakers. Use advanced technologies such as ultrasonic partial discharge detection and SF₆ gas chromatographic analysis to regularly assess internal insulation status under operating voltage, shorten detection cycles, and timely track insulation degradation trends. This enables targeted measures to prevent sudden internal insulation failures during operation.