I'm not an electricity power engineer, but it looks like each low voltage phase (secondaries) consists of 2 windings in parallel. I guess this is simply because a single winding would be to stiff to wind on by hand. The high voltage primaries looks also to have 2 windings each as well, one with taps, the other without. In operation at the lightest loads, the transformer primary would have just the phase windings without taps connected to the incoming supply. As an automatic 'on load tap changer' detects secondary voltage drop with increasing load , tapped windings are switched in parallel to restore the secondary voltage, i.e. automatic tap changing takes place without interruption to the supply.
Сам работаю на трансформаторном заводе, но до такого "технологического уровня" нам конечно далеко. Особенно умиляет покраска бака из краскопульта и пропитка катушек в корыте из бочки. Жаль не показаны изготовление бака и резка ламелей для магнитопровода.
У нас примерно такая же технология ремонта. Катушки на подобном же станке мотают. Медные обмотки сейчас редкость, алюминий везде. Ну и шайбы граверные подкладыают. А так одень в спецовки "Россети" и за своих принять можно. Стенд по испытанию транса даже лучше нашего выглядит
@@Pikulev_Evgeniy Ну, технология намотки похожа на нашу, только по низкой стороне мотаем единой лентой, а не пучком шин. Станки у нас не новые, но с программным управлением. Покраска баков - автоматизированная линия. Испытательные станции - два больших участка. У индусов собранный магнитопровод выглядит ужасно. Масло просто набулькали. У нас заливка в вакуумной камере.
@@sergeyg6 , для улучшения изоляции на трансах 10/0, 4кв обычно первичная обмотка (10кв) идёт поверх вторички (0, 4кв).В противном случае габариты транса вырастут.
Thats essentially how it's done.. Although in modern factories they use machines for rolling, and instead of shit on of what I'm assuming is cable they use full aluminum sheets
Amazing crafstmanship & industrial skilled workers, but it's sad they're not being provided with PPE (personal protective equipment) such as respirators (masks) or gloves when handling the solutions, torches and solder as well as the painter.
Actually some of those welds sucked! They will likely fail under pressure and expansion/contraction due to heating/cooling cycles. Where is the quality control for this company?
Isn't nice how capitalism works ? You get stuff from these 'slaves' basically because they're paid very shit wages for what they do, for your comfort. That's reality btw, I'm not insulting anyone here. That's how the world works based on this capitalism bs.
9:15 на шайбах сэкономили. как и у нас примерно также лепят. раз уже приходилось переделывать транс, где отводы прикрутили как попало, прямо на пластиковую панель. когда по уму надо было сперва болты прикрутить к пластику на гайку как надо. Было : Болт - пластик - отвод - шайба и гайка. в итоге отгорело. Стало: Болт - пластик - шайба - гровер. потом Гайка - шайба широкая- отвод - шайба широкая - гровер - гайка. только так стало надежно работать и провод перестал греться.
Es increíble como trabajan sin usar ningún tipo de protección, además con los químicos en contacto directo con su piel, sin zapatos especiales de protección, guantes ni otros sistema para salvaguardar su integridad física. Mis respetos.
@@user-bj4lp3fr1o Split lock washers don't help against losing torque, but they do help against fully undoing the bolted connection, so in my opinion in this case it would be helpful.
@@CubicSpline7713 aluminum does actually find use in large distribution transformers (it's good for foil windings and especially for resin cast unit), but copper definitely is a better conductor. Oil soaked paper (or cardboard as you put it) is the norm for transformer insulation, and isn't a "low quality Chinese" thing
Eu conheço...trabalhei na Eletropaulo -SP -Brasil com isso...esse enrolamento de fio grosso e poucas espiras é o de tensão baixa ...o enrolamento de muitas espiras de fio fino é o de alta tensão !
No se puede creer que existan personas que trabajen en condiciones sumamente precarias sin elementos de seguridad ni protección . La avaricia del ser humano y la explotación de sus semejantes
This is likely not General Electric or ABB. I don't see too many production workers in factories I have been to in the United States wearing flip-flops.
PARABÉNS POR SUAS POSTAGENS Amei, estás informações são muito boas pra aquelas pessoas que acha tudo caro, mas não para um minuto sequer pra pensar o quão trabalhoso é o processo de fabricação e os custos que há até chegar ao consumidor final. Boa Sorte. Abraços Erenito Maia De VITÓRIA ES, BRASIL
Bạn nên gia nhiệt cho vật liệu trước khi sơn cách điện.gia công chi tiết lớn bằng phương pháp thủ công rất vất vả .bạn có tay nghề cao và thuần thục công việc.bạn luôn hạnh phúc
Whilst these are rather small transformers, the construction requirements are generally similar throughout all scales. Look how much time and effort goes into just the one; now, consider how much materials / time / effort goes into the very HV "Supergrid" systems, and consider the far, FAR longer lead times for replacement should they be significantly damaged, as we saw in the US Metcalfe attack in 2014 ($15 million in damage over 20 minutes).
our military budget costs us 1.5 million a minute, 93 million a hour or 2.2 billion a day. so while 15 million in 20 minutes sounds like a lot, when compared to real wastes of money...it's not even a drop in a bucket. clearly the time and effort required to build these transforms is no joke, still the cost of that attack isn't much in the grand scheme of things. also seems kinda crazy that they wouldn't have replacements ready....but i suppose that shouldn't be unexpected with how lax regulations are for companies.
@@rocksfire4390 Its the time requirement and limited amount of manufacturers. Lead times are insane right now. Almost 2 years for any transformer order if you can even get a manufacturer that will take an order.
…and while I respect the skilled labor of these men, none of this is being done in the U.S. In parallel with this video, TH-cam sought fit to put into my feed a video titled Hot Boats and Hot Bikinis. So, while we in the U.S. are busy playing, getting drunk, and fornicating, and our economy has turned into a service one in which we produce almost nothing in durable goods, we have offshored essential manufacturing like this. Just more anecdotal evidence that the United States is done and over.
@@rocksfire4390transformers are constantly being built for older installation replacement and new addition. There will likely not be a production capacity increase due to diseconomies of scale in the industry.
Lo que yo quiero saber en qué pais se esta fabricando esta tecnológia. Como información para mi y los que veen este canal de TH-cam se agradece por el loable conocimiento que brindan a la humanidad. Suerte 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍............
0:07 - Winding the low-voltage coil 2:08 - Low-voltage coil ready 2:35 - Impregnating low-voltage coil with a mixture of transformer oil and kerosene 3:13 - Mounting low-voltage coils on the core 4:00 - Winding the high-voltage coil 4:33 - That's how they make branches to the voltage regulator switch 4:46 - Solder worker burns paper insulation of the coil because he doesn't use wet asbestos fabric 5:15 - High-voltage coil ready 5:26 - Mounting high-voltage coils into the transformer 5:47 - Finalizing the core 6:14 - Fastening the core 6:24 - Mounting the active part ready 6:42 - Mounting the cover 7:00 - Mounting the conductors 7:27 - Mounting the low-voltage copper rails 7:54 - Soldering low-voltage coil ends on the rails 8:28 - Low-voltage part ready 8:33 - Soldering high-voltage coil ends (they used wet asbestos this time) 8:55 - Insulating high-voltage joints 9:06 - Creating the null-point bushing 9:13 - Connecting high-voltage wires with the regulator switch 9:25 - Putting transformer into the drying vacuum chamber (72 hrs) 9:45 - Powering up vacuum chamber's heating 9:51 - (meanwhile) Preparing and painting transformer tank and the cooling system 10:07 - Tank ready 10:10 - (after 3 days) Opening the vacuum chamber 10:27 - Inserting transformer into the oil tank 11:17 - Screwing the top cover with the tank 11:23 - Mounting the oil conservator 11:33 - Filling up with transformer oil 11:58 - Preparing for final test 12:06 - Testing the transformer 12:19 - Test ready
Расскажите мне пожалуйста инженеру энергетику работающему более пятнадцати лет в этой сфере, где здесь качество, хочу услышать! Вы все такие знающие, аж хочется вас всех пригласить на работу, в руководящий состав.
Great video. Just natural sounds. No bullshit music.
looks like a very serious craftwork. Amazing to see, how a handful people build such one.
Great craftmanship. Very nicely build coils and assembly. A few missing washers and spring washers on the connections.
Молодцы мужики, лайк однозначно. Привет из России.
In the West, this would be done in a clean room... These guys are way ahead of us in cost and quickness.
That is a clean room by Indian standards. Notice - no sand on the floor.
@@CHMichael and no fire inside the building.
Transformer production facilities are the perfect place for flip flops. I always say
No, No. Those are safety flip-flops!
I'm not an electricity power engineer, but it looks like each low voltage phase (secondaries) consists of 2 windings in parallel. I guess this is simply because a single winding would be to stiff to wind on by hand. The high voltage primaries looks also to have 2 windings each as well, one with taps, the other without. In operation at the lightest loads, the transformer primary would have just the phase windings without taps connected to the incoming supply. As an automatic 'on load tap changer' detects secondary voltage drop with increasing load , tapped windings are switched in parallel to restore the secondary voltage, i.e. automatic tap changing takes place without interruption to the supply.
ما شاء الله دائما الابداع في باكستان حتى المعمل بسيط ومتواضع
Сам работаю на трансформаторном заводе, но до такого "технологического уровня" нам конечно далеко. Особенно умиляет покраска бака из краскопульта и пропитка катушек в корыте из бочки. Жаль не показаны изготовление бака и резка ламелей для магнитопровода.
У нас примерно такая же технология ремонта. Катушки на подобном же станке мотают. Медные обмотки сейчас редкость, алюминий везде. Ну и шайбы граверные подкладыают. А так одень в спецовки "Россети" и за своих принять можно. Стенд по испытанию транса даже лучше нашего выглядит
@@Pikulev_Evgeniy Ну, технология намотки похожа на нашу, только по низкой стороне мотаем единой лентой, а не пучком шин. Станки у нас не новые, но с программным управлением. Покраска баков - автоматизированная линия. Испытательные станции - два больших участка. У индусов собранный магнитопровод выглядит ужасно. Масло просто набулькали. У нас заливка в вакуумной камере.
Интересно где пучёк идёт это первичная обмотка или вторичная уже со сниженным напряжением. Сколько такой трансформатор как на видео весит.
@@sergeyg6 , для улучшения изоляции на трансах 10/0, 4кв обычно первичная обмотка (10кв) идёт поверх вторички (0, 4кв).В противном случае габариты транса вырастут.
Самое главное- работает же.
Thats essentially how it's done.. Although in modern factories they use machines for rolling, and instead of shit on of what I'm assuming is cable they use full aluminum sheets
Ну ни хрена себе сколько меди! Медный Клондайк прям
Felicidades desde Panamá 🇵🇦
Тяжёлый труд...надо все правильно подогнать и изолировать каждый, процесс долгий и трудоёмкий...Удачи и Здоровья всем! Молодцы! Sehr gut!
Спасибо за это прекрасное видео ! Я ни сколько не жалею, что потратил на его просмотр своё время ❤
Время пол первого ночи 🌙 настал момент смотреть как индусы что то мастерят
Это Пакистан
Amazing crafstmanship & industrial skilled workers, but it's sad they're not being provided with PPE (personal protective equipment) such as respirators (masks) or gloves when handling the solutions, torches and solder as well as the painter.
Donate some if you're so concerned
Very sad the lives may be shorter for the small cost of respirators. Fantastic work though.
Actually some of those welds sucked! They will likely fail under pressure and expansion/contraction due to heating/cooling cycles. Where is the quality control for this company?
Isn't nice how capitalism works ? You get stuff from these 'slaves' basically because they're paid very shit wages for what they do, for your comfort. That's reality btw, I'm not insulting anyone here. That's how the world works based on this capitalism bs.
@@s.irfanjafry1181 yeah, looks like no flux.
Felicidades por el maravilloso trabajo eléctrico les envío saludos desde Bolivia - Sud América
Super magic technology...1907 year..😂
9:15 на шайбах сэкономили. как и у нас примерно также лепят. раз уже приходилось переделывать транс, где отводы прикрутили как попало, прямо на пластиковую панель. когда по уму надо было сперва болты прикрутить к пластику на гайку как надо. Было : Болт - пластик - отвод - шайба и гайка. в итоге отгорело. Стало: Болт - пластик - шайба - гровер. потом Гайка - шайба широкая- отвод - шайба широкая - гровер - гайка. только так стало надежно работать и провод перестал греться.
Отчего у них пожары каждый день случаются!
Es increíble como trabajan sin usar ningún tipo de protección, además con los químicos en contacto directo con su piel, sin zapatos especiales de protección, guantes ni otros sistema para salvaguardar su integridad física. Mis respetos.
cant believe, that this transformer works. they made it with ancient tools
Your videos are very helpful to understand these processes but,
please add steps of these processes what is happening and why.
A clean room? Is there anything lying around? High-tech production? WELL DONE!!!
Handwork without any protection, gloves, glasses, special clothes. The true cost of it is much
Yeah! This is frindavan 👍🏻
Easy like eat Bananas with fork and knife. 🎉
@@achmadkhotibulumam7889😂😂a
And these are used in west coz those are cheaper than domestic made transformers
Yes welding without safety goggles , spraying paints without safety masks etc.....
These guys are incredibly smart shows you how smart they are they can do it without protection and not get hurt
9:43 Professional electrical installation :)))
9:51 Painting without mask 😲
I can see maximum use being made of the Pakistan micrometer (BFH). Metropolitan Vickers style 1919.
عمل متقن جدا ،في مجال تصنيع الترانسات يجب استعمال مواد جيدة جدا المهم النتيجة ، شكرا لكم
فقط المواد الجيدة والصنعة الجيدة يمكن أن تحقق نوعية جيدة.
The tap-offs on the primary side really needed some washers with lock washers. You don't want anything to start arcing on the inside.
Studies show split lock washers don’t help.
@@user-bj4lp3fr1o Split lock washers don't help against losing torque, but they do help against fully undoing the bolted connection, so in my opinion in this case it would be helpful.
You crossthread them, crossthread natures locktite 🤷♂️
That's copper, not aluminium - means premium transformer
If it were Chinese, they would use aluminium (+ cardboard).
@@CubicSpline7713 agree
중국이라면 알루미늄+거짓용량으로 소비자를 속일것입니다.
@@gomdolri 그것은 모두 기술 제어 부서에 달려 있으며 고품질이 있고 가짜도 있습니다
@@CubicSpline7713 aluminum does actually find use in large distribution transformers (it's good for foil windings and especially for resin cast unit), but copper definitely is a better conductor. Oil soaked paper (or cardboard as you put it) is the norm for transformer insulation, and isn't a "low quality Chinese" thing
The complete and total disregard for worker safety is astounding.
Masha Allah top Werk from our Pakistani Brothers
All I could think of while watching this is OSHA would have a stroke on the spot if they saw this.
Eu conheço...trabalhei na Eletropaulo -SP -Brasil com isso...esse enrolamento de fio grosso e poucas espiras é o de tensão baixa ...o enrolamento de muitas espiras de fio fino é o de alta tensão !
My whole body cringed when I saw that 25mm wrench used on a nut that was closer to 23mm at 6:39.
A ideia era espanar a porca 😂
No se puede creer que existan personas que trabajen en condiciones sumamente precarias sin elementos de seguridad ni protección . La avaricia del ser humano y la explotación de sus semejantes
Thanks for the tutorial, it's much faster than any other method I came across.
I like how they make things.great job guys.
Very impressive.
The only caveat being absolutely no PPE being used at all. Incredible really.
This is likely not General Electric or ABB. I don't see too many production workers in factories I have been to in the United States wearing flip-flops.
...охапка дров - и транс готов.☝️
Buen trabajo, pero faltan los elementos de seguridad, what a nice job , but the security elements are missing .saludos desde santiago de Chile ❤🇨🇱
Good luck
Кругом медь! Нифига себе
Brilliant technicians with profound infrastructure. Good.
Todo al milímetro siguiendo los standares y calidad y normativa.
Construcción con la ultima tecnología
А по факту импортозамещение!)
I am not working in this business but I can assure that this is not the regular way how these transformers are manufactured.
PARABÉNS POR SUAS POSTAGENS
Amei,
estás informações são muito boas pra aquelas pessoas que acha tudo caro, mas não para um minuto sequer pra pensar o quão trabalhoso é o processo de fabricação e os custos que há até chegar ao consumidor final.
Boa Sorte.
Abraços
Erenito Maia
De
VITÓRIA ES, BRASIL
Quanto custa esse transformador do vídeo?
No way I’d energise that on the grid
байден норм ?????
Самый главный вопрос....... Где они столько меди взяли! )))
SARCAM firmasından almışlardır.
it's made in Pakistan 🇵🇰
Кастрюли переплавили .
Very good! Wire of Cooper!
Cool that so many people are involved in making them :)
Если ещё пропитать специальным лаком и в печь поставить , то ещё в два раза гарантия качества...😊
Ok..so who's doing the quality control...geez
parabéns por mostrar seu trabalho , e o quanto é importante para todos , valeu continue no mesmo propósito !
Trabalho e profissionais nota 10. Parabéns. Que DEUS os abençoe cada vez mais.🇧🇷
Lá é assim. Aqui é diferente. Nas fábricas do Brasil o nível é outro.
Bạn nên gia nhiệt cho vật liệu trước khi sơn cách điện.gia công chi tiết lớn bằng phương pháp thủ công rất vất vả .bạn có tay nghề cao và thuần thục công việc.bạn luôn hạnh phúc
the power switch at 9.45 looks a real bodge job
Very talented guys
Whilst these are rather small transformers, the construction requirements are generally similar throughout all scales. Look how much time and effort goes into just the one; now, consider how much materials / time / effort goes into the very HV "Supergrid" systems, and consider the far, FAR longer lead times for replacement should they be significantly damaged, as we saw in the US Metcalfe attack in 2014 ($15 million in damage over 20 minutes).
our military budget costs us 1.5 million a minute, 93 million a hour or 2.2 billion a day.
so while 15 million in 20 minutes sounds like a lot, when compared to real wastes of money...it's not even a drop in a bucket.
clearly the time and effort required to build these transforms is no joke, still the cost of that attack isn't much in the grand scheme of things.
also seems kinda crazy that they wouldn't have replacements ready....but i suppose that shouldn't be unexpected with how lax regulations are for companies.
@@rocksfire4390 Its the time requirement and limited amount of manufacturers. Lead times are insane right now. Almost 2 years for any transformer order if you can even get a manufacturer that will take an order.
@@gabenowell
that's crazy, to think something so essential is allowed to be in such a state.
…and while I respect the skilled labor of these men, none of this is being done in the U.S.
In parallel with this video, TH-cam sought fit to put into my feed a video titled Hot Boats and Hot Bikinis. So, while we in the U.S. are busy playing, getting drunk, and fornicating, and our economy has turned into a service one in which we produce almost nothing in durable goods, we have offshored essential manufacturing like this. Just more anecdotal evidence that the United States is done and over.
@@rocksfire4390transformers are constantly being built for older installation replacement and new addition.
There will likely not be a production capacity increase due to diseconomies of scale in the industry.
Es maravilloso la fabricacion de Transformadores gracias por compartir
*NO HAY MÁQUINA EN EL MUNDO QUE REEMPLACE LA ARTESANÍA HUMANA.*
India adalah negara yang masih menghargai kerja manusia dg tidak menggantinya dg tenaga mesin
It's Pakistan not India.
Well done
Very interesting- thank you
Parabéns por mostrar o trabalho de vcs sou rebobinador de motores e transformador gostei muito parabéns a vcs
Pretty nice,thank you soooo much
What a good tutorial thanks!!
*THERE IS NO MACHINE IN THE WORLD THAT REPLACES HUMAN CRAFTSMANSHIP.*
Wow a lot of work gone in to make a transformer 😳 I thought someone pushed a button on a machine and it would magically be made 🙄
Probably more automation in western countries.
What an amazingly complicated process.
espetacular!
Lo que yo quiero saber en qué pais se esta fabricando esta tecnológia. Como información para mi y los que veen este canal de TH-cam se agradece por el loable conocimiento que brindan a la humanidad. Suerte 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍............
Nice work men, impressive craftsmanship!
Glad you like it!
Piękne wykonanie - pozdrowienia z Polski. 🔥
Warunki słabe, ale widać, że produkt końcowy jest dobry.
ciekawostka - na urządzeniu "testowo-pomiarowym" pod koniec filmu widać polskie mierniki N15Z firmy Lumel
Bardzo zdolni i pracowici ludzie. Szkoda tylko że nie dbają o zdrowie (maczanie gołych dłoni w lakierze)
@@wojtek2812 no tak - takie to u nich standardy.
Sungguh luar biasa cara pembuatanya
Pekalongan, Jawa Tengah, Indonesia ok.... 👍🙏
Toda essa técnica ...graça à Nicolás tesla .Show parabéns 👏🤝🇧🇷🇧🇷🇨🇮
Bravissimi tutti i miei complimenti 👍
9:45" priceless
Awesome… very beautiful 👌 thanks for sharing my friend 👍👍
Gracias por el video me ha ilustrado muy bien ahora me he ilustrado y he aumentado mi técnica muchas gracias
u r from which country?
pln kayaknya beli alat2 seperti ini, padahal kalau bikin sendiri akan sangat menghemat anggaran
*NÃO HÁ MÁQUINA NO MUNDO, QUE SUBSTITUA A MÃO DE OBRA ARTESANAL HUMANA.*
Por enquanto...
Bacana a produção, porém, tem um milhão de possíveis quase acidentes. Surreal a falta de segurança.
Cong cụ thô sơ mà làm đỉnh quá
Some explanations of what is happening at various stages would help, but great video otherwise.
0:07 - Winding the low-voltage coil
2:08 - Low-voltage coil ready
2:35 - Impregnating low-voltage coil with a mixture of transformer oil and kerosene
3:13 - Mounting low-voltage coils on the core
4:00 - Winding the high-voltage coil
4:33 - That's how they make branches to the voltage regulator switch
4:46 - Solder worker burns paper insulation of the coil because he doesn't use wet asbestos fabric
5:15 - High-voltage coil ready
5:26 - Mounting high-voltage coils into the transformer
5:47 - Finalizing the core
6:14 - Fastening the core
6:24 - Mounting the active part ready
6:42 - Mounting the cover
7:00 - Mounting the conductors
7:27 - Mounting the low-voltage copper rails
7:54 - Soldering low-voltage coil ends on the rails
8:28 - Low-voltage part ready
8:33 - Soldering high-voltage coil ends (they used wet asbestos this time)
8:55 - Insulating high-voltage joints
9:06 - Creating the null-point bushing
9:13 - Connecting high-voltage wires with the regulator switch
9:25 - Putting transformer into the drying vacuum chamber (72 hrs)
9:45 - Powering up vacuum chamber's heating
9:51 - (meanwhile) Preparing and painting transformer tank and the cooling system
10:07 - Tank ready
10:10 - (after 3 days) Opening the vacuum chamber
10:27 - Inserting transformer into the oil tank
11:17 - Screwing the top cover with the tank
11:23 - Mounting the oil conservator
11:33 - Filling up with transformer oil
11:58 - Preparing for final test
12:06 - Testing the transformer
12:19 - Test ready
thank you so much
Torque wrenches? Torque wrenches? We don't need no steenking torque wrenches!
PARABÉNS no BRASIL É IGUAL.FAZEMOS A MESMAS COISA.(GEITO DE TRABALHAR)
bem assim..uma merda bem atrasada ..mas mesma técnica usada a 70 anos atras,,
Parah , ini luar biasa , dibuat dengan tanpa alat² canggih , amazing.
Prindapan pride
Тяжелая, но очень нужная работа!!!
Bravo !!!
Impressionnant !!!
Son expertos en su trabajo y por eso los felicito, per por que no usan equipo de protección ? Otra cosa de que país son, de la India acaso?.
Uau, que procedimento bacana da construção de um transformador.
Thanks for your sharing
Future Orthopedic Surgeons. ;-)
Высокое качество работы, несмотря на то что вручную собрано и с умом!
Расскажите мне пожалуйста инженеру энергетику работающему более пятнадцати лет в этой сфере, где здесь качество, хочу услышать! Вы все такие знающие, аж хочется вас всех пригласить на работу, в руководящий состав.
@@MegaYang77 оно перегорит через месяц?
@@docktor_al7304 МегаЯнг такой же энергетик, как Филипп Киркоров гномик...🥴🤗🤪
@@user-gz3xt7qh9m
А чё, они масло не заливают вёдрами ?!
@@docktor_al7304 ты считаешь, что они в своей стране, каждый месяц меняют такие трансформаторы?
Hmmm .but what about relay and explosion vent and other stuff ??🤔🤔
Beautiful job ! Lots of hard work !
ประเทศที่เจริญแล้ว เวลาเขาจะซื้ออะไรที่สำคัญมาก ๆ เขาจะต้องส่งคนมาดูวิธีสร้าง ณ โรงงานที่ผลิต เมื่อมั่นใจในขั้นตอนการผลิตเขาจึงสั่งซื้อ