There could be a quality issue regarding the winding wire insulation - I've had cases where inferior low cost materials were used in manufacturing particularly, where copper varnish coated winding wire was involved.
The Random or 'Mush' method of winding & installation of motor stator coils is...
An old Boss's expression:"Perfection is not of this World" comes to mind when Engineers & their crews have to deal with a painful situation like Sandy's aftermath.
Time is of the essence to get heating & lighting restored for the millions of suffering citizens.
Safety is always a major...
I overcame the rotor problem by installing a Steam Age P&B Golds Motor Protection relay on the Feed process to a gyratory rock Crusher.
A set of Crusher Motor C/Ts were connected to the P&B relay.
The Alarm/Trip contacts were wired to a warning alarm to alert the operator of a possible...
Motor Aluminium Rotor bars are not a good choice for this application.
Agree with others that an integrating type of impact/overload sensing is required
to reasonably regulate the the choke feed to the crusher.
Operator training monitoring is a big factor - they will always push the limits to...
Agree with rhatcher.
This type of earth fault is typical where a coil has blown out at the end or middle of
a stator slot.
The earth fault blows itself open & clear so subsequent tests do not reveal any poor
megger readings.
Look for hole in winding isulation, copper spatter & carbon footprint.
A 2 Hole lug is a far superior fixing of this size cable to transformer termination bars.
Main reasons (as mentioned by other members) is ease of installation & less chance of connection working loose under load)
It is standaed practice in South Africa
Greetings mjmarkey1979
I was called in to troubleshoot a 4kM long cable that was newly installed to remote control a Large Pump Station.
After locating under ground joints using as built drawings(???) & TDR I found a 300m middle section had been carefully joined to itself!!
The Company...
Use of Time Domain reflectometer in the hands of an experienced engineer will accurately locate the position of all your joints.
Joints could then be examined externally for any possible ingress of moisture due to damage or poor jointing procedures.
All suspect joints could be cut out & replaced.
I have the GE Book which I'm selling on behalf of the Widow of a deceased estate.
I believe the cost of the book & shipping costs from South Africa of this tome would rule out the US or UK as a buyers.
Yes Chaps
Was a time when Essential Services - Electricity, Water & Telephones were Government non-profit organisations!
Now we are in the hands of greedy Bankers, Shareholders & Stockbrokers.
All profit driven repair services have been privatised, expensive & poor.
Al la Enron!
Now we look...
The major problems that Eastern USA is having due to freak conditions, poses the question - Is there a program to replace
Heavily wooded town distribution O/H lines with underground cable?
There is a huge cost difference, but the costs & disruption due to the present catastrophe could be partly...
If the cables are multicore & you can expose the ends of cores,
try pulling the cores out one at a time with a Tirfor Winch similar device.
It worked for a scrap copper thief that pulled the 120mmm2 copper cores out of a redundant underground swa cable.
Mind you, he had a steam locomotive at...
