Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Cleaning High Voltage Lightning Arresters
- Thread starter JasonJ
- Start date
Welcome to the forum, you need to be specific with your questions here, here is a general link to your general question.
You will find standards for maintenance of arrestors there. A more specific question will get you a more specific answer. There are some great minds with alot of experience here.
Scott Peterson
Training Manager
Power Plus Engineering
You will find standards for maintenance of arrestors there. A more specific question will get you a more specific answer. There are some great minds with alot of experience here.
Scott Peterson
Training Manager
Power Plus Engineering
You need to be specific in your question. Are you looking for cleaning methods, such as using Collinite No. 237 High Voltage insulator cleaner on de-energized and grounded equipment?
Or are you looking for methods of cleaning while the equipment is energized, such as corn cob blasting?
Or are you looking for methods of cleaning while the equipment is energized, such as corn cob blasting?
- Thread starter
- #4
Sorry for the non-specific question wbd and thank you for the response. I'm writing a generic Maintenance Policy Manual for the many power plants my company represents and I need to add some info about cleaning Transformer Lightning Arresters to our Transformer Maintenance section. I am having trouble finding info on any cleaning procedures for de-energized or energized equipment.
okay, basically the best way is to perform the cleaning with the equipment de-energized, LOTO and grounded. You should clean the insulators/bushings/LA's with a high voltage insulator cleaner like Collinite 237, following the instructions on the can. Not much to it.
I would also check the tightness of all connections, including the base bolts and look for signs of overheating. If these are large LA's, they could be Doble testing at the same time the transformer and transformer bushings are. The LA's on the transformers can be cleaned the same way the transformer bushings are.
Hope that helps.
I would also check the tightness of all connections, including the base bolts and look for signs of overheating. If these are large LA's, they could be Doble testing at the same time the transformer and transformer bushings are. The LA's on the transformers can be cleaned the same way the transformer bushings are.
Hope that helps.
You need to restore the coating by using Colinite or my favorite, beaver butter.
For developing a RCM program you really should download the NETA MTS, it tells you how and when to conduct PM on power systems. You can also reference the 2006 NFPA 70B.
For developing a RCM program you really should download the NETA MTS, it tells you how and when to conduct PM on power systems. You can also reference the 2006 NFPA 70B.
Surge arrester may be treated as an insulator for cleaning purpose. Below is a condensed information from IEEE Std 957-2005 for illustration purposes.
===========================================================
Check if the enclose test could guide you:
Describe your actions sequentially to restore the station (temporarily and permanently)
Inspect the potential device insulator for sing of flashover and other damage damages such as insulator puncture, crack in the porcelain, oil leak or any other physical damages
If not damage is found, proceed to clean the potential device with water followed by a wipe down with isopropyl alcohol to remove any dust or salt deposit.
After the cleaning, the system the system is ready to be restore and get the line back in service
For longer term, there are several options available to protect the potential device from flashover:
o Water washing.
o Surface coating such as silicon grease, high resistance glazing, hydrocarbon grease, room temperature vulcanizing (RTV), etc.
o Install corona ring the made uniform the voltage distribution along insulator.
o Replace the unit with higher-leakage insulator or no ceramic insulator unit.
Due to the variety of options and methods a study is recommended to determine include a live cycle cost of best protective action to maintaining the expected level of reliability and system availability.
=========================================================
The need for cleaning arrester/insulator depend on the frequency and risk level of flashover that is directly associaty with pollution level, contaminat deposit, environment conditions, lightning activity, overvoltage, creepage distance etc.
If there is severe problem of contamination/flashover, the enclose link may have application:
===========================================================
Check if the enclose test could guide you:
Describe your actions sequentially to restore the station (temporarily and permanently)
Inspect the potential device insulator for sing of flashover and other damage damages such as insulator puncture, crack in the porcelain, oil leak or any other physical damages
If not damage is found, proceed to clean the potential device with water followed by a wipe down with isopropyl alcohol to remove any dust or salt deposit.
After the cleaning, the system the system is ready to be restore and get the line back in service
For longer term, there are several options available to protect the potential device from flashover:
o Water washing.
o Surface coating such as silicon grease, high resistance glazing, hydrocarbon grease, room temperature vulcanizing (RTV), etc.
o Install corona ring the made uniform the voltage distribution along insulator.
o Replace the unit with higher-leakage insulator or no ceramic insulator unit.
Due to the variety of options and methods a study is recommended to determine include a live cycle cost of best protective action to maintaining the expected level of reliability and system availability.
=========================================================
The need for cleaning arrester/insulator depend on the frequency and risk level of flashover that is directly associaty with pollution level, contaminat deposit, environment conditions, lightning activity, overvoltage, creepage distance etc.
If there is severe problem of contamination/flashover, the enclose link may have application:
- Thread starter
- #10
- Status
Similar threads
- Question
- Locked
- Question
- Locked
- Question