Miyahuna Awards TECO Group for Premium Autotransformer Starter Panels In June 2016, TECO Group - Jundi Electrical Industry proudly supplied 20 high-performance autotransformer standalone starter panels, ranging from 50KW to 150KW, to Miyahuna Water Com... tecogrp.com/miyahuna-autotra…

Also, this reminds me of the voltage chopping circuit used to lower the operating temperature of a soldering iron, still effective with cheap pencil irons today. This, a dim bulb tester, and an autotransformer (VARIAC) are the foundation of many test benches.

Perhaps a portable gateway that simulated a V2H setup could be built. It would have an autotransformer with a central tap to provide 120 V legs, and both 120 V and 240 V outlets. That would allow 14-50 outlet to power anything an F-150 Lightning or Cybertruck could power from their bed outlets.

🇷🇺⚔️🇺🇦A new strike has been carried out on the 330 kV "Sumy-North" substation in the Sumy region Earlier, Russian FPV drone operators struck the autotransformer located in the sarcophagus. Today, footage emerged of a strike on another part of the substation and also on equipment in a hastily erected building. The drone operator easily flew inside, just like last time, and then hit the target with a direct strike. ukraine_watch

We're preparing Ukraine for the next winter now. Another high-capacity autotransformer has joined @NPCUkrenergo's reserve — critical equipment to replace assets damaged by ongoing attacks & keep the power system stable. Together w/partners, we're helping keep Ukraine’s lights on

Another critical boost to Ukraine’s energy resilience through international partnership 🇺🇦⚡️A high-capacity autotransformer has been added to @Ukrenergo1 reserves. It was fully funded by @EBRD, with logistics organised and financed by @UNDPUkraine, with support from Denmark 🇩🇰 This critical equipment will help replace assets damaged by #RussianEnergyTerror and strengthen the grid ahead of winter. Grateful to our partners for keeping Ukraine powered.

📊 SPML INFRA LTD - 500402 | 🏷️ Investor Presentation SPML Infra Ltd has released its investor presentation for April 2026, emphasizing strategic growth and operational excellence in infrastructure development. Key Highlights: Business Overview - Established as a leader in water and waste management infrastructure. - Successfully ventured into multiple sectors including hydro power, urban water supply, and waste management. - Completed over 72 projects across various states, enhancing operational capacity. Financial Strength - Achieved a turnover exceeding INR 10,000 Mn. - Secured INR 1,400 Mn through rights issue to bolster capital for expansion. - Recognized with 4 prestigious awards for excellence in infrastructure development. Strategic Focus & Growth Engines - Focused on expanding into renewable energy with the introduction of battery energy storage systems (BESS). - Engaged in significant projects under the Jal Jeevan Mission, enhancing water supply infrastructure. - Targeting growth in smart city initiatives with advanced water management solutions. Operational Highlights - Installed 220 kV GIS substation in West Bengal valued at INR 783 Cr. - Developed 500 MVA autotransformer in Uttar Pradesh, contributing to regional infrastructure. - Commenced operations for 10 MLD tertiary treatment plant in Karnataka. Financial Performance: - Revenue for Q3 FY26 reached INR 3,772 Cr. - EBITDA margin maintained at 15%, reflecting operational efficiency. - PAT for the quarter stood at INR 450 Mn, with a YoY growth of 12%. Order Book & Inflows: - Current order book valued at INR 15,000 Cr, showcasing strong demand. - Recent wins include INR 1,158 Cr water supply EPC project in Gujarat and multiple orders from Jharkhand and Tamil Nadu. The presentation underscores robust execution capabilities, strong order pipeline, and strategic expansion into renewable energy. 📈🌍💰 💰 CMP: ₹216.35 ( 2.44%) 🏢 MCap: ₹1,657 Cr 🌐 Details: tinyurl.com/24c4b2oq ⚡️Instant stock alerts on WhatsApp - Try FREE 👉 speedystox.com

Depends on the dimmer type. Variac/autotransformer dimmer → drops voltage cleanly → no Dirty electricity → the blackbody curve shifts even warmer as you dim (more IR, less blue) Standard TRIAC dimmer (most modern ones) → slices the AC sine wave → generates Dirty electricity even with Incandescents The dimmer your grandmother had = good In India, it's called "Dimmerstat" Get a single-phase dimmerstat rated for the wattage of your bulbs. A standard 2A unit handles up to ~440W, which is more than enough for home use. Old-style stepped fan regulators (the bakelite ones with 5 clicks) were resistor-based. If you have one lying around, it works.

See my post from 2023 listing *some* of the numerous reports of Ukraine's campaign of shelling the Zaporozhye Nuclear Power Plant & Russia warning of a disastrous outcome if Ukraine continues. Ukraine Shells Zaporozhye Nuclear Power Plant – NPP Operator Fifteen shells were fired at the plant's facilities but there has been no radiation leak detected, an official from nuclear power operator Rosenergoatom said Sunday. Shells had been fired near a dry nuclear waste storage facility and a building that houses fresh spent nuclear fuel, Rosenergoatom adviser Renat Karchaa revealed. t.me/rtnews/32636 Ukraine Shells IAEA Inspectors After Zaporozhye Plant Visit - Russian Officials The International Atomic Energy Agency's return from their mission to the Zaparozhye nuclear plant was delayed as Ukrainian forces broke a truce and shelled the area, according to Moscow. t.me/rtnews/42984 The Zaporozhye nuclear plant in Energodar is the largest in Europe. Since March 2022 it has been under Russian control and Zaporozhye Region recently voted in a referendum to join Russia. In the meantime, Kiev continues to attack the plant, putting Europe at risk of a disaster six times bigger than the 1986 Chernobyl disaster. Despite IAEA warnings and the referendum, Kiev continues to use the Zaporozhye plant as a blackmail tool. The documentary shows the timeline of the attacks and focuses on potential risks of Ukrainian provocations. t.me/rtnews/30782 Facts to know on the eve of today’s meeting of the UN Security Council on Zaporozhskaya NPP   🔵 On 5-6 August the Armed Forces of Ukraine (AFU) once again attacked ZNPP by shelling the critically important infrastructural objects of the plant as well as its satellite city Energodar. Twenty shells have been fired during the strikes 🔵 On 5 August, at 14:45, the Ukrainian shelling (three shells hit in the proximity of the training centre next to the territory of the open switchgear of the NPP) resulted in shutdown of the autotransformer and the high voltage line providing backup power to the Units №1 and №2 of ZNPP 🔵 On 5 August, at 16:45, the Ukrainian side committed an artillery shelling (four shells) of oil and fuel oil handling equipment and the site of hydrogen receivers. Damage of the pipeline caused jet fire that was localized due to timely and professional actions of ZNPP personnel and Russian military 🔵 On 6 August, at 19:42, the AFU units attacked ZNPP once again. Three artillery shells of 155 millimeters caliber (NATO standard) exploded next to the spent fuel storage and only 200 meters from the operating unit. One person was injured 🔵 On 7 August ZNPP was again shelled by the Ukrainian armed formations. The high-voltage power line “Kakhovskaya” was damaged. Equipment of an open switchgear (750 kW) was damaged as a result of a power surge. At Unit №4, that was operational at 10% capacity, the power supply of control and safety system went offline. This triggered the emergency protection of the Unit №4 🔵 The Ukrainian personnel of the plant has decided on cooldown of the Unit №4 of ZNPP, as well as downpower of the Units №5 and №6. Currently, the Units №5 and №6 are downpowered to 500 MW 🔵 On 11 August Ukrainian armed formations again tried to attack the ZNPP with missiles and UAVs. This attack was repulsed by the air defense forces 🔵 In addition to direct military threats to the security of ZNPP the Kiev regime is working on other scenarios to create intentional preconditions for a nuclear accident at ZNPP. Inter alia, Kiev is considering different options of cutting the plant off from the Ukrainian power grid and keeps increasing psychological pressure on ZNPP employees and their relatives (they regularly receive phone calls threatening them with criminal prosecutions and physical reprisals) t.me/MFARussia/13303 t.me/EvaKarene_Bartlett/1277…

To get Xrays, you go supply electricity to our machine, this electricity go enter two different sides inside the machine, one go go where step up transformer and autotransformer dey, come increase d light in terms of voltage wey go reach thousands, then the light go enter between

Using a full bridge recrifier, my trustworthy 1969 autotransformer and bench psu I was able to determine that both sites(the switching trafo output and rectifier board) are fine. The issue is with working under load. Ever so small load current as 60mA makes the smps turn off.

in some countries they need voltage stabilizers ( autotransformer) at their home since the ac voltage fluctuates between standards

I guess it wraps the cable and uses an autotransformer.

#UkraineRussiaWar #Pokrovsk #Kupyansk #Toretsk #Sumy #Dobropolye #Vovchansk Ukrainian energy news Brown ovals on the diagram represent the power plants described below Kremenchuk Hydroelectric Power Station (Svetlovodsk city, Kirovohrad region) was hit by more than 20 of our "Geran" drones. Probably repaired and restarted. I wouldn’t be surprised if military astronomers spotted how persistent Ukrainians dragged in another scarce 330/150 kV autotransformer, and our space rocket troops broke it during installation. Kiev CHPP-5, CHPP-6 were slightly scared by UAVs, but nearby, the actively smoking Trypilska CHPP was hit by a "Kinzhal" missile. Its current 300 MW heat generation for Kiev is quite a lot. Pridneprovskaya CHPP (Dnipropetrovsk) was also hit, but probably not seriously, it was barely functioning anyway. And wearing the yellow leader’s jersey for our attention is Zmiivska TPP (Kharkiv region). They shouldn’t have been so brazen as to start two additional power units on top of the two already running, thinking no one would notice. That’s about 700 MW of pure electron energy output, clear as a tear And in Kremenchuk, following today's strikes, in addition to the electricity supply problems, water restrictions have been imposed on the ground floors for six hours a day, while the upper floors continue to have no water, according to the city's mayor, Vitaliy Maletsky.

What are Autotransformers? How do they work with just a single coil? Should you get one? That's what we're covering in this short tech tip. Learn all about autotransformers, how they work, and when to use them. #transformer #energy #powerindustry #autotransformer

So more bad results with the autotransformer build. Tried it a couple ways. Built a trifiliar for a reference. It's the only version that gives good results. Cap makes the high end worse! I was worried it was the Type 61 cores. Thankfully not. 🤓 @TheSmokinApe

First iteration of the 9:1 autotransformer on the test rig. 15:3 ratio. 470Ω resistor. Type 61 core. It's hot garbage 🔥 Let's see what's next 👀

I was thinking about an autotransformer design for a 9:1 UnUn (end-fed random wire) - this would be in place of the 9 trifiliar turns of the typical 9:1. Cap may be optional. Anybody ever try anything like this? 🤔

The 330/110/35 kV “Kharkovskaya” (Artyoma-330) substation — one of the key distribution nodes in the eastern energy ring of the Kharkov power district — sustained heavy damage from an airstrike. The facility transfers power from the Zmievskaya Thermal Power Plant to the city grid and industrial zone, while also linking with the Zalyutino and Central substations. Its installed capacity is 600 MVA. The substation includes two 200 MVA autotransformers (ATDCTN-200000/330/110/35 kV), open switchyards at 330 and 110 kV, a 6/10 kV auxiliary power unit, and outgoing high-voltage lines to Zmievskaya TPP, Zalyutino, TEC-3, Centralnaya, Levada, Yuzhkabel, and GPP-1/2. It is an open-type installation with rigid aluminum busbars and RGD-330/2000 disconnectors, making it vulnerable to blast and thermal effects. Around 22:00 on October 13, 2025, two FAB-250 aerial bombs equipped with planning and correction modules (UMPK) struck the substation. Both impacted the central switching field and the autotransformer zone. One hit autotransformer AT-1, the other hit the 330 kV switchyard near the Artyoma–Zalyutino line. The explosions caused cascading damage at both 330 and 110 kV levels, leading to large-scale disruption of Kharkov’s power grid. Technical damage: Autotransformer No.1 was completely destroyed, with tank rupture, oil ignition, and breakdown of high- and medium-voltage bushings. Autotransformer No.2 suffered partial thermal damage, upper tank deformation, and cooling circuit failure. The 330 kV yard collapsed in part, insulators on phase “B” were shattered, busbars torn down, and disconnectors disabled. The 110 kV yard sustained phase faults and porcelain insulator breakage. Auxiliary systems lost power due to cable ruptures. Relay and telemetry systems, including automatic load shedding (AЧР) and re-closing (АПВ), went offline. The fire involved transformer oil of the GK-3 type, confirmed by dense black smoke and persistent flame. Energy impact: The 330 kV power transit between Zmievskaya TPP and Zalyutino was cut, causing outages at several 110 kV city substations. Voltage sagged to 60–65% of normal in central and southern districts. Industrial feeders at Yuzhkabel and TEC-3 experienced surges and flicker. Two 110 kV feeders to GPP-2 and Levada were disconnected. Networks shifted to an unbalanced mode with neutral current up to 1.5–1.8 kA. By 23:00, engineers were attempting partial restoration via TEC-3 and Centralnaya, but voltage remained unstable with neutral potential swings and frequency variations between 49.2 and 50.6 Hz. Current status and outlook: The substation operates in a restricted mode with throughput cut by over 50%. Citywide voltage quality remains poor, with frequent dips to 190–200 V in low-voltage networks. Dismantling of the destroyed AT-1 and replacement of the 330 kV portal structures are planned for tomorrow. Full restoration of stable power flow is not expected before late October 2025. t.me/don_partizan/10508

Russian forces carried out a series of strikes overnight on October 11–12 targeting Kiev’s radar and energy infrastructure. The attacks used Kh-31P anti-radar missiles along with Geran-2 and Geran-3 strike drones. In Solenoe, Dnepropetrovsk region, an anti-radar Kh-31P missile launched from a Su-34 jet destroyed a Western-made AN/TPQ-36 Firefinder radar post, demolishing its antenna and control modules and damaging nearby support vehicles. In Novoiversk, Donetsk region, a Geran-2 drone hit the 110/65/6 kV substation of Kramatorsk High-Voltage Power Lines, damaging a major transformer, destroying relay control cabinets, and collapsing an administrative building. In Shevchenkovo, Kharkov region, three Geran-2 drones struck Lyceum No. 1, where a guard company of the 582nd security battalion was stationed, collapsing the upper floor and destroying communication equipment. In Chaplino, Dnepropetrovsk region, three Geran-2 drones hit temporary deployment areas of the 31st Mechanized and 37th Marine Brigades, destroying a medical vehicle and several shelters. In Novosyolovka, Odessa region, the Ananyev gas measuring station took nine drone hits, eight of which were intercepted; one caused significant damage to the DN-400 pipeline and equipment, forcing operations to halt. Finally, in Pavlograd, a Geran-2 drone struck the 330 kV “Pavlogradskaya” substation of Ukrenergo, damaging a massive oil-filled autotransformer and 110 kV cable joints. Power was briefly reduced in the central energy grid before being restored. t.me/don_partizan/10469