8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
1/13
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
2/13
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
3/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 3
Figure 1.Conservator Oil Level
Check the oil level gauge on the conservator. See figure 1at right. This gauge indicates oil level by displaying a temperature. Compar
the indicated temperature on the conservator level gauge with the top oil temperature indicator. They should be approximately the same.
Calibrate or replace the conservator oil level indicator if needed, but only after checking the top oil temperature indicator as shown in the
above section. Reference also IEEE 62-1995 [11], section 6.6.2. If atmospheric gases (nitrogen, oxygen, carbon dioxide) an
perhaps moisture increase suddenly in the DGA, a leak may have developed in the conservator diaphragm or bladder. With th
transformer offline and under clearance, open the inspection port on top of the conservator and look inside with a flashlight. If there is a
leak, oil will be visible on top of the diaphragm or inside the bladder. Reclose the conservator and replace the bladder or diaphragm a
the first opportunity by scheduling an outage. If there is no gas inside the Buchholz Relay, the transformer may be re-energized aftebleeding the air out of the bladder failure relay.
A DGA should be taken immediately to check for O2, N2, and moisture. However, the transformer may be operated until a new
bladder is installed, keeping a close eye on the DGAs. It is recommended that DGAs be performed every 3 months until the new
bladder is installed. After the bladder installation, the oil may need to be de-gassed if O2 exceeds 10,000 ppm. Also, carefully chec
the moisture level in the DGAs to ensure it is below recommended levels for the particular transformer voltage. Check the desiccant in
the breather often; never let more than two-thirds become discolored before renewing the desiccant. All efforts should be made to keep
the oxygen level below 2,000 ppm and moisture as low as possible.
1.5 Conservator Breather
Figure 2.Conservator Breather
Check the dehydrating (desiccant) breather for proper oil level if it is an oil type unit. Check the color of the desiccant and replace i
when approximately one-third remains with the proper color. See figure 2for a modern oil type desiccant breather. Notice the pink
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
4/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 4
desiccant at the bottom of the blue indicating that this portion is water saturated. Notice also that oil is visible in the very bottom 1-inch
or so of the unit.
Many times, the oil is clear, and the oil level will not be readily apparent. Normally, there is a thin line around the breather near th
bottom of the glass; this indicates where the oil level should be.
Compare the oil level with the level indicator line and refill, if necessary. Note the 1-inch pipe going from the breather to th
conservator. Small tubing ( inch or so) is not large enough to admit air quickly when the transformer is de-energized in winter. A
transformer can cool so quickly that a vacuum can be created from oil shrinkage with enough force to puncture a bladder. When this
happens, the bladder is destroyed; and air is pulled into the conservator making a large bubble.
1.6 Nitrogen
If the transformer has a nitrogen blanket, check the pressure gauge for proper pressure. Look at the operators recording of pressures
from the pressure gauge. If this does not change, the gauge is probably defective. Check the nitrogen bottle to insure the nitrogen is the
proper quality (see PEB No. 5 [20]). Check for any increased usage of nitrogen which indicates a leak. Smaller transformers such a
station service or smaller generator-step-up transformers may not have nitrogen bottles attached to replace lost nitrogen. Be especially
watchful of the pressure gauge and the operators records of pressures with these.
The pressure gauge can be defective for years, and no one will notice. The gauge will read nearly the same and will not vary much ove
winter and summer or night and day. Meanwhile, a nitrogen leak can develop; and all the N2 will be lost. This allows air with oxygen
and moisture to enter and deteriorate the oil and insulation. Watch for increased oxygen and moisture in the DGA. An ultrasonic andsonic leak detection instrument (P-2000) is used for locating N2 leaks.
1.7 Oil Leaks
Oil Leaks
Check the entire transformer for oil leaks. Leaks develop due to gaskets wearing out, ultraviolet exposure, taking a set, or from
expansion and contraction, especially after transformers have cooled, due to thermal shrinkage of gaskets and flanges. Many leaks ca
be repaired by applying an epoxy or other patch.
Flange leaks may be stopped with these methods using rubberized epoxy forced into the flange under pressure. Very small leaks i
welds and tanks may be stopped by peening with a ball-peen hammer, cleaning with the proper solvent, and applying a patch of the
correct epoxy.
Experienced leak mitigation contractors whose work is guaranteed may also be employed. Some leaks may have to be welded
Welding may be done with oil in the transformer if an experienced, qualified, and knowledgeable welder is available. If welding with oi
in the tank is the method chosen, oil samples must be taken for DGA both before and after welding. Welding may cause gases to appea
in the DGA and it must be determined what gases are attributed to welding and which ones to transformer operation.
1.8 Pressure Relief Device
With the transformer under clearance, check the pressure relief device indicating arm on top of the Figure 3. Pressure Relief Device.
transformer to see if it has operated. If it has operated, the arm will be in the up (vertical) position, and alarm and shutdown relays
should have activated.
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
5/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 5
Figure 3. Pressure Relief Device
CAUTION:
Do not re-energize a transformer after this device has operated and relays have de-energized the transformer, until
extensive testing to determine and correct the cause has been undertaken. Explosive, catastrophic failure could be the
result of energization after this device has operated.
1.9 Oil Pumps
If the transformer has oil pumps, check flow indicators and pump isolation valves to ensure oil is circulating properly. Pump motor(s
may also have reversed rotation, and flow indicators may still show that oil is flowing. To ensure motors are turning in the prope
direction, use an ammeter to check the motor current. Compare results with the full-load-current indicated on the motor nameplate. I
the motor is reversed, the current will be much less than the nameplate full-load-current. Check oil pumps with a vibration analyzer
they develop unusual noises.
Have the DGA lab check for dissolved metals in the oil and run a metal particle count for metals if the bearings are suspect. This shoul
be done immediately, as soon as a bearing becomes suspect; bad oil-pump bearings can put enough metal particles into the oil t
threaten transformer insulation and cause flashover inside the tank. An explosive catastrophic failure of the transformer tank could be the
result.
1.10 Fans and Radiators
Inspect all isolation valves at the tops and bottoms of radiators to ensure they are open. Inspect cooling fans and radiators for cleanlines
and fans for proper rotation. Check for dirty or damaged fan blades or partially blocked radiators. Fans are much more efficient if the
blades are clean and rotating in cool air. Normally, fans blow cool air through the radiators; they should not be pulling air through
Check to see if fans are reversed electrically (i.e., pulling air first through the radiators and then through the fan blades). This means th
blades are rotating in warm air after it passes through the radiator which is much less efficient. Place a hand on the radiator opposite th
fans; air should be coming out of the radiator against your hand.
Watch the blades as they rotate slowly when they are starting or stopping to determine which way they should be rotating and correcthe rotation if necessary.
1.11 Buchholz Relay
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
6/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 6
Figure 4.Buchholz Relay
Inspect the isolation valve on the Buchholz relay to ensure it is open. With the transformer offline and under clearance, examine th
Buchholz relay by lifting the window cover (center in figure 4at right) and looking inside. If there is gas inside, the oil will be displaced
and the gas will be evident as a space on top the oil. If sufficient gas is found to displace the upper float, the alarm should be activated
The small valve at the top left is to bleed the gas off and reset the relay. If a small amount of gas is found in this relay when thetransformer is new (a few months after startup), it is probably just air that has been trapped in the transformer structure and is now
escaping; there is little cause for concern.
If the transformer has been on line for some time (service aged), and gas is found in the Buchholz, oil samples must be sent to the lab fo
DGA and extensive testing. Consult with the manufacturer and other transformer experts. A definite cause of the gas bubbles must b
determined and corrected before re-energization of the transformer.
1.12 Sudden Pressure Relay
Figure 5.Sudden Pressure Relay
An example relay is shown in figure 5at the left. The purpose of this relay is to alarm if there is a sudden pressure rise inside the tank
This relay is very sensitive and will operate if the pressure rises only a little. If a very small pressure change occurs caused by a smal
electrical fault inside the tank, this relay will alarm. In contrast, the pressure relief device (shown above in figure 5) operates if a larg
pressure builds inside the tank caused by heavy arcing and heating causing the oil to boil and bubble. Inspect the isolation valve t
ensure it is open.
With the transformer offline and under clearance, functionally test the sudden pressure relay by slowly closing the isolating valve. Leave
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
7/13
8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
8/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 8
51 people recommend this.Recommend
Posted by: ecsanyion Saturday, August 21, 2010 at 9:15 pm
Tagged with:buchholz relay, conservator, fans, inpection, nitrogen, oil,pressure relief,pumps, radiators, sudden, temperature,
transformer, visual
Turn Your Thoughts Into Words
Tell us what you're thinking... we care about your opinion!
and oh, not to forget - if you want a picture to show with your comment, go get a free Gravatar!
Name (required)
Mail (will not be published) (required)
Website
CAPTCHA Code *
Submit Comment
Comments RSS Feed
Comments
6 Responses to Visual Inspection Of The Oil Transformer
1. ecsanyisays:
21 August, 2010 at 21:29
Do you think this can be enough informations for technicians to visually inspect oil transformer?
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-419http://www.csanyigroup.com/http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/feedhttp://en.gravatar.com/http://www.csanyigroup.com/tag/visualhttp://www.csanyigroup.com/tag/transformerhttp://www.csanyigroup.com/tag/temperaturehttp://www.csanyigroup.com/tag/suddenhttp://www.csanyigroup.com/tag/radiatorshttp://www.csanyigroup.com/tag/pumpshttp://www.csanyigroup.com/tag/pressure-reliefhttp://www.csanyigroup.com/tag/oilhttp://www.csanyigroup.com/tag/nitrogenhttp://www.csanyigroup.com/tag/inpectionhttp://www.csanyigroup.com/tag/fanshttp://www.csanyigroup.com/tag/conservatorhttp://www.csanyigroup.com/tag/buchholz-relayhttp://www.csanyigroup.com/about-us8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
9/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 9
Reply
2. Jeremysays:
22 August, 2010 at 09:36
It depends on transformer condition. I had few very hard to detect problems with ABB's oil transformers 1600kVA.
Reply
Stefan Smithsays:
25 August, 2010 at 15:08
Of course it has a lot with transformer state. What problems did you have with ABBS transformers? You didnt mention
rated primary voltage.
Reply
ecsanyisays:
25 August, 2010 at 15:14
After few years and bad or non-at-all inspections ANY oil transformer can became unstable in work or show some
more or less serious problems.
Reply
3. fransiscosays:
22 November, 2013 at 11:44
hey guys do you think we can notice the level of transformer oil without visual inspection?
Reply
Trackbacks
Check out what others are saying about this post...
1. diesel generator: MEP-003a Onan/Libby Welding Military Generatorsays:
23 August, 2010 at 13:09
[...] Visual Inspection Of The Transformer | CsanyiGroup [...]
Reply
SUbscribe To Technical Articles
7 Reasons to subscribeand receive
technical articlesand updates via email:
Subscribe
Delivered via Google Feedburner
http://www.csanyigroup.com/home/7-reasons-to-subscribehttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=427#respondhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-427http://dieselgeneratorreviews.net/mep-003a-onanlibby-welding-military-generator.htmlhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=857#respondhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-857http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=434#respondhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-434http://www.csanyigroup.com/http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=433#respondhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-433http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=421#respondhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformer/comment-page-1#comment-421http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer?replytocom=419#respond8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
10/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 10
Electrical Engineering | Ads
Electrical Engineering | Sponsors
Electrical Engineering Articles
Recent
Most Read
Comments
ABB launches new generation 420kV gas insulated switchgear
Superconducting transformers
Largest Tesla Coil Ever Built
ePlusMenuCAD 10 RC1 New Release
ABB Power Transformers A guide to manufacturing
Light Pollution
Line Protection With Distance Relays
UPS design criteria and selection
The New ETS4: Easy, Fast, Open
Arc-resistant low voltage switchgear
ANSI/IEC Relay Symbols viewed 51,125 times
Comparison Between Vacuum and SF6 Circuit Breaker viewed 49,177 times
ANSI standards for protection devices viewed 47,613 timesTransformer heating and cooling viewed 26,359 times
Substation, Its Function And Types viewed 20,128 times
General about motors viewed 18,508 times
Wind Power Applications viewed 16,085 times
PLC-Based Monitoring Control System for Three-Phase Induction Motors Fed by PWM Inverter viewed 15,955 times
Gas-Insulated Switchgear Type 8DN8 viewed 15,195 times
Grounded or Ungrounded Systems viewed 15,154 times
kinderklamotten aus china
Dieses Site wird laufend von einem Suchmaschinen- Spezialisten weiterentwickelt, was Ihnen zustzlich die Gewhr bietet,
Current Transformer
Fuel Liquid Level Sensor
Sight Glasses, Flowmeters
flow points.co.uk
Sight glasses, flow indicators and flowmeters
for water andliquids
Fuel Level Sender
http://www.csanyigroup.com/siemens-mv-topic-loss-of-vacuum#comment-2371http://www.csanyigroup.com/wind-power-applicationshttp://www.csanyigroup.com/substation-its-function-and-typeshttp://www.csanyigroup.com/transformer-heating-and-coolinghttp://www.csanyigroup.com/comparison-between-vacuum-and-sf6-circuit-breakerhttp://www.csanyigroup.com/the-new-ets4-easy-fast-openhttp://googleads.g.doubleclick.net/aclk?sa=L&ai=C_uTRYviOVLWmAoiR7gbyhIGoDfGz2KcF8Yjp9NkBwI23ARAEIMmN6CAoBGC3vIOF9DDIAQGoAwHIA8MEqgSoAU_Qq70izN1_TYjxl0mPdKXRA3B5xYWTmZlle0jVBzl9eUqyxW9haxUTsbdfN41B0tB8mIMkaBnL8jxba_vp6TWMLJvlZN492QJcT2-ekYMCA5FaBKR0qURZK9jIVe82VkcjA8KtYtV8FEBoaJ4G31jKAIp3tokJC3psZyIFhGSu_WJev5ABHGpm0ziRLQocZcppCl_Hw7DzsyEa-jwcdrWfGP35v-QtioAHibfpMw&num=4&sig=AOD64_11XM5NsB2q1mHANNqcMLWdI4rckw&client=ca-pub-8074809922364090&adurl=http://www.ciescorp.nethttp://googleads.g.doubleclick.net/aclk?sa=L&ai=CQR5kYviOVLWmAoiR7gbyhIGoDb2pt4YCqdG3ugPAjbcBEAMgyY3oICgEYLe8g4X0MMgBAakCA2oE9xBIuj6oAwHIA8MEqgSlAU_Q6_U_zNp_TYjxl0mPdKXRA3B5xYWTmZlle0jVBzl9eUqyxW9haxUTsbdfN41B0tB8mIMkaBnL8jxba_vp6TWMLJvlZN492QJcT2-ekYMCA5FaBKR0qURZK9jIVe82VkcjA8KtYtV8FEBoaJ4G31jKAMJ3CuOIg0H2ys_uYeFPFuHlVHuwE3dm3c2S7_8fJT9qmqrE00Xwt9QZ_ssZdlefucFOR4AHmcvlBw&num=3&sig=AOD64_3sezJhdTI8YXXahASp17cPJBje2Q&client=ca-pub-8074809922364090&adurl=http://www.flowpoints.co.uk/home.htmhttp://googleads.g.doubleclick.net/aclk?sa=L&ai=CQR5kYviOVLWmAoiR7gbyhIGoDb2pt4YCqdG3ugPAjbcBEAMgyY3oICgEYLe8g4X0MMgBAakCA2oE9xBIuj6oAwHIA8MEqgSlAU_Q6_U_zNp_TYjxl0mPdKXRA3B5xYWTmZlle0jVBzl9eUqyxW9haxUTsbdfN41B0tB8mIMkaBnL8jxba_vp6TWMLJvlZN492QJcT2-ekYMCA5FaBKR0qURZK9jIVe82VkcjA8KtYtV8FEBoaJ4G31jKAMJ3CuOIg0H2ys_uYeFPFuHlVHuwE3dm3c2S7_8fJT9qmqrE00Xwt9QZ_ssZdlefucFOR4AHmcvlBw&num=3&sig=AOD64_3sezJhdTI8YXXahASp17cPJBje2Q&client=ca-pub-8074809922364090&adurl=http://www.flowpoints.co.uk/home.htmhttp://googleads.g.doubleclick.net/aclk?sa=L&ai=CQR5kYviOVLWmAoiR7gbyhIGoDb2pt4YCqdG3ugPAjbcBEAMgyY3oICgEYLe8g4X0MMgBAakCA2oE9xBIuj6oAwHIA8MEqgSlAU_Q6_U_zNp_TYjxl0mPdKXRA3B5xYWTmZlle0jVBzl9eUqyxW9haxUTsbdfN41B0tB8mIMkaBnL8jxba_vp6TWMLJvlZN492QJcT2-ekYMCA5FaBKR0qURZK9jIVe82VkcjA8KtYtV8FEBoaJ4G31jKAMJ3CuOIg0H2ys_uYeFPFuHlVHuwE3dm3c2S7_8fJT9qmqrE00Xwt9QZ_ssZdlefucFOR4AHmcvlBw&num=3&sig=AOD64_3sezJhdTI8YXXahASp17cPJBje2Q&client=ca-pub-8074809922364090&adurl=http://www.flowpoints.co.uk/home.htmhttp://googleads.g.doubleclick.net/aclk?sa=L&ai=CQR5kYviOVLWmAoiR7gbyhIGoDb2pt4YCqdG3ugPAjbcBEAMgyY3oICgEYLe8g4X0MMgBAakCA2oE9xBIuj6oAwHIA8MEqgSlAU_Q6_U_zNp_TYjxl0mPdKXRA3B5xYWTmZlle0jVBzl9eUqyxW9haxUTsbdfN41B0tB8mIMkaBnL8jxba_vp6TWMLJvlZN492QJcT2-ekYMCA5FaBKR0qURZK9jIVe82VkcjA8KtYtV8FEBoaJ4G31jKAMJ3CuOIg0H2ys_uYeFPFuHlVHuwE3dm3c2S7_8fJT9qmqrE00Xwt9QZ_ssZdlefucFOR4AHmcvlBw&num=3&sig=AOD64_3sezJhdTI8YXXahASp17cPJBje2Q&client=ca-pub-8074809922364090&adurl=http://www.flowpoints.co.uk/home.htmhttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CPlwMYviOVLWmAoiR7gbyhIGoDcX3ipUF_a7m0ZYBwI23ARACIMmN6CAoBGC3vIOF9DCgAdPloNADyAEBqQKMTu4LPAhxPqgDAcgDwwSqBKkBT9CbpKTWwUZ1OkKFLY90_JwTYnbSlZ2MhH9-FpgLO6rCTIbGbykhEhZbbB0ckUHWmmmY2yRoQIbiLlR86-f8KJYpxaho3H-AHUZJe5PQxwUekk8Cs2mvRRpp0YMM8zseBSUGg_RkxnMJVWF1gQ7IyisDCPW1QMOwZB-3ge5hh0MW4ddee7CtgY3cwWcsCByl_5-J38fTVQWwIRr-zep1t5seHR9IyUsGnYgGAYAHlZrfLw&num=1&cid=5GhP8e0enOyNtgHq4_1AV1XU&sig=AOD64_2NsjtU7yZFs9myLiyrBM5_jS9d2A&client=ca-pub-8074809922364090&adurl=http://en.autovision.com.ua/sistema-teletrack/oborydovanie/datchik-yrovnya-topliva-epsilon.htmlhttp://www.googleadservices.com/pagead/aclk?sa=L&ai=C3Vb3YviOVLWmAoiR7gbyhIGoDf6trb0G9ruK_rYBwI23ARABIMmN6CAoBGC3vIOF9DCgAZre-NADyAEBqQJGNIwDIa6FPqgDAcgDwwSqBKYBT9DLsvPVwUV1OkKFLY90_JwTYnbSlZ2MhH9-FpgLO6rCTIbGbykhEhZbbB0ckUHWmmmY2yRoQIbiLlR86-f8KJYpxaho3H-AHUZJe5PQxwUekk8Cs2mvRRpp0YMM8zseBSUGg_RkxnMJVWF1gQ7IyisDCL21r5s-4x0vLAOKYsb3ClTlkFscjpDcz5Ivyummv2qKTzLQRfCzJe_9yR1wt3ke61S-a4gGAYAHzqGHLw&num=2&cid=5GhP8e0enOyNtgHq4_1AV1XU&sig=AOD64_22DpYipH9-DcVkPY_wbauhL2Db2Q&client=ca-pub-8074809922364090&adurl=http://www.nuodewei.com/english/cpzs.asp%3Fsortsid%3D722%26sorts%3D%25B5%25E7%25C1%25F7%25BB%25A5%25B8%25D0%25C6%25F7http://www.csanyigroup.com/siemens-mv-topic-loss-of-vacuum#comment-2371http://www.csanyigroup.com/grounded-or-ungrounded-systemshttp://www.csanyigroup.com/gas-insulated-switchgear-type-8dn8http://www.csanyigroup.com/plc-based-monitoring-control-system-for-three-phase-induction-motors-fed-by-pwm-inverterhttp://www.csanyigroup.com/wind-power-applicationshttp://www.csanyigroup.com/general-about-motorshttp://www.csanyigroup.com/substation-its-function-and-typeshttp://www.csanyigroup.com/transformer-heating-and-coolinghttp://www.csanyigroup.com/ansi-standards-for-protection-deviceshttp://www.csanyigroup.com/comparison-between-vacuum-and-sf6-circuit-breakerhttp://www.csanyigroup.com/ansi-iec-relay-symbolshttp://www.csanyigroup.com/arc-resistant-low-voltage-switchgearhttp://www.csanyigroup.com/the-new-ets4-easy-fast-openhttp://www.csanyigroup.com/ups-design-criteria-and-selectionhttp://www.csanyigroup.com/line-protection-with-distance-relayshttp://www.csanyigroup.com/light-pollutionhttp://www.csanyigroup.com/abb-power-transformers-a-guide-to-manufacturinghttp://www.csanyigroup.com/eplusmenucad-10-rc1-new-releasehttp://www.csanyigroup.com/largest-tesla-coil-ever-builthttp://www.csanyigroup.com/superconducting-transformershttp://www.csanyigroup.com/abb-launches-new-generation-420kv-gas-insulated-switchgearhttp://www.elektroenergetika.info/http://news.csanyigroup.com/http://www.automatika.rs/http://electrical-engineering-portal.com/8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
11/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 1
im Web auch tatschlich unter den Suchbegriffen Regenbekleidung Hersteller, wasserdichte Regenhosen, Regenjacken und
Regenmntel, Regenschutz Kleidung vom Friesennerz bis zum Motorradkombi, Kinder Regenjacke online Angebote etc.
remodel loans
Combining warm white lights with yellow lights or using it against a painted wall can exude warmth and welcome in a room
The spacing of studs determines the energy efficiency of walls. Construction estimating software has become an essential
tool in the arsenals of home renovation contractors, builders, DIY, as well as some home owners who are looking to
educate themselves to better negotiating a pricing with contractors. If you have work that needs to be done in the house,
you will need to consider their schedule. It means that you will have to refinance into a home rehab loan.
ahmed elnhas
and if it true , doesn't that mean that the continuity of the system will be affected if the upstream CB energize multiple
parallel feeders
ahmed elnhas
all what i get is that upstream CB will trip before the fault current at downstream CB reach its maximum value , is that true
???
Johnd895
Do you mind if I quote a few of your posts as long as I provide credit and sources back to your weblog? My blog is in the
very same niche as yours and my users would truly benefit from a lot of the information you present here. Please let me
know if this alright with you. Thank you! cdgddggggbek
Article Categories
ANSI Standards
AutoCADCables
Energy And Power
ePlusMenuCAD
High Voltage
Hydropower
IEC Standards
KNX
Lighting
Low Voltage
Medium Voltage
Motors
Power Substations
Programmable Logic Controller
Protection Relays
SCADA
Solar Energy
Tips & tricks
Transformers
Updates And Announcements
Variable Speed Drives
Wind Power
http://www.csanyigroup.com/category/strucni-tekstovi/wind-power/feedhttp://www.csanyigroup.com/technical-articles/categories/category-wind-powerhttp://www.csanyigroup.com/category/strucni-tekstovi/variable-speed-drives/feedhttp://www.csanyigroup.com/technical-articles/categories/category-variable-speed-driveshttp://www.csanyigroup.com/category/updates-and-announcementshttp://www.csanyigroup.com/technical-articles/categories/category-updates-and-announcementshttp://www.csanyigroup.com/category/strucni-tekstovi/transformers/feedhttp://www.csanyigroup.com/technical-articles/categories/category-transformershttp://www.csanyigroup.com/category/tips-tricks/feedhttp://www.csanyigroup.com/technical-articles/categories/category-tips-and-trickshttp://www.csanyigroup.com/category/strucni-tekstovi/solar-energy/feedhttp://www.csanyigroup.com/technical-articles/categories/category-solar-energyhttp://www.csanyigroup.com/category/strucni-tekstovi/scada/feedhttp://www.csanyigroup.com/technical-articles/categories/category-scadahttp://www.csanyigroup.com/category/strucni-tekstovi/protection-relays/feedhttp://www.csanyigroup.com/technical-articles/categories/category-protection-relayshttp://www.csanyigroup.com/category/strucni-tekstovi/programmable-logic-controller/feedhttp://www.csanyigroup.com/technical-articles/categories/category-programmable-logic-controllerhttp://www.csanyigroup.com/category/strucni-tekstovi/power-substations/feedhttp://www.csanyigroup.com/technical-articles/categories/category-power-substationshttp://www.csanyigroup.com/category/strucni-tekstovi/motors/feedhttp://www.csanyigroup.com/technical-articles/categories/category-motorshttp://www.csanyigroup.com/category/strucni-tekstovi/medium-voltage/feedhttp://www.csanyigroup.com/technical-articles/categories/category-medium-voltagehttp://www.csanyigroup.com/category/strucni-tekstovi/low-voltage/feedhttp://www.csanyigroup.com/technical-articles/categories/category-low-voltagehttp://www.csanyigroup.com/category/strucni-tekstovi/lighting/feedhttp://www.csanyigroup.com/technical-articles/categories/category-lightinghttp://www.csanyigroup.com/category/strucni-tekstovi/knx/feedhttp://www.csanyigroup.com/technical-articles/categories/category-knxhttp://www.csanyigroup.com/category/iec-standards/feedhttp://www.csanyigroup.com/technical-articles/category-iec-standardshttp://www.csanyigroup.com/category/strucni-tekstovi/hydropower/feedhttp://www.csanyigroup.com/technical-articles/categories/category-hydropowerhttp://www.csanyigroup.com/category/strucni-tekstovi/high-voltage/feedhttp://www.csanyigroup.com/technical-articles/categories/category-high-voltagehttp://www.csanyigroup.com/category/software/eplusmenucad-software/feedhttp://www.csanyigroup.com/technical-articles/categories/category-eplusmenucadhttp://www.csanyigroup.com/category/strucni-tekstovi/energy-and-power/feedhttp://www.csanyigroup.com/technical-articles/categories/energy-and-powerhttp://www.csanyigroup.com/category/strucni-tekstovi/cables/feedhttp://www.csanyigroup.com/technical-articles/categories/category-cableshttp://www.csanyigroup.com/category/autocad/feedhttp://www.csanyigroup.com/technical-articles/category-autocadhttp://www.csanyigroup.com/category/strucni-tekstovi/ansi-standards/feedhttp://www.csanyigroup.com/technical-articles/category-ansi-standardshttp://www.csanyigroup.com/ups-design-criteria-and-selection#comment-913http://www.csanyigroup.com/cascading#comment-1551http://www.csanyigroup.com/cascading#comment-1552http://www.csanyigroup.com/field-test-procedure-for-protective-relays#comment-17048/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
12/13
12/15/2014 Visual Inspection Of The Transformer | CsanyiGroup
http://www.csanyigroup.com/visual-inspection-of-the-oil-transformer 12
Links
Direktorijum Kvalitetnih Srpskih Sajtova
Visitors
Portal Content
ePlusMenuCAD | DevelopmentElectric Power Books
Technical Articles
Electrical Design Software & Tools
AutoCAD | Video Training
Engineering Knowledge
Translate to your language
Hindi
Arabic
Filipino
ive Traffic Feed
eal-time view Menu
visitor from Malaysia viewed Motor
Operation Efficiency Under Abnorma...13
ins agovisitor from Cordoba, Argentina viewed
ePlusMenuCAD | CsanyiGroup22 mins ago
visitor from Ho Chi Minh City, Vietnam
iewed General about motors | CsanyiGroup
28 mins agovisitor from Lagos viewed "Visual Inspection Of
he Transformer | CsanyiGroup" 28 mins ago
visitor from Kennesaw, Georgia viewed
"Caterpillar C175 Diesel Generator |CsanyiGroup"32 mins agovisitor from Oran viewed "AutoCAD Video
raining | CsanyiGroup" 36 mins ago
visitor from Islamabad viewed "Field Test
rocedure For Protective Relays | CsanyiGroup"
52 mins agovisitor from New York viewed "ANSI/IEC
elay Symbols | CsanyiGroup" 56 mins ago
visitor from Louisville, Kentucky viewed "Guide
o Low Voltage Busbar Trunking Systems (1) |
CsanyiGroup" 56 mins ago
visitor from United States viewed "ANSI/IECelay Symbols | CsanyiGroup" 59 mins ago
visitor from Ho Chi Minh City, Ho Chi Minh
iewed "General about motors | CsanyiGroup" 1 hr
http://feedjit.com/freeLiveTrafficFeed/?utm_source=ltf&utm_medium=web&utm_campaign=ltfCampaignhttp://live.feedjit.com/live/csanyigroup.com/0/http://live.feedjit.com/live/csanyigroup.com/0/http://live.feedjit.com/live/csanyigroup.com/0/http://www.csanyigroup.com/guide-to-low-voltage-busbar-trunking-systems-1http://www.csanyigroup.com/guide-to-low-voltage-busbar-trunking-systems-1http://www.csanyigroup.com/guide-to-low-voltage-busbar-trunking-systems-1http://www.csanyigroup.com/ansi-iec-relay-symbolshttp://www.csanyigroup.com/field-test-procedure-for-protective-relayshttp://www.csanyigroup.com/download/autocad-traininghttp://www.csanyigroup.com/download/autocad-traininghttp://www.csanyigroup.com/download/autocad-traininghttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformerhttp://www.csanyigroup.com/eplusmenucadhttp://www.csanyigroup.com/eplusmenucadhttp://www.csanyigroup.com/general-about-motorshttp://www.csanyigroup.com/ansi-iec-relay-symbolshttp://www.csanyigroup.com/guide-to-low-voltage-busbar-trunking-systems-1http://www.csanyigroup.com/ansi-iec-relay-symbolshttp://www.csanyigroup.com/field-test-procedure-for-protective-relayshttp://www.csanyigroup.com/download/autocad-traininghttp://www.csanyigroup.com/caterpillar-c175-diesel-generatorhttp://www.csanyigroup.com/visual-inspection-of-the-oil-transformerhttp://www.csanyigroup.com/general-about-motorshttp://www.csanyigroup.com/eplusmenucadhttp://www.csanyigroup.com/motor-operation-efficiency-under-abnormal-conditionshttp://feedjit.com/freeLiveTrafficFeed/?utm_source=ltf&utm_medium=web&utm_campaign=ltfCampaignhttp://live.feedjit.com/live/csanyigroup.com/0/http://live.feedjit.com/live/csanyigroup.com/0/http://www.bluehost.com/track/wordfence/fjnew1http://feedjit.com/?utm_source=ltf&utm_medium=web&utm_campaign=ltfCampaignhttp://bit.ly/cmLdvYhttp://bit.ly/aSwFZUhttp://bit.ly/cZZsoMhttp://www.webserbia.net/8/10/2019 Visual Inspection of the Transformer _ CsanyiGroup
13/13