View allAll Photos Tagged insulators
First is an "S OB T" not sure what the the S and T stand for, Next is unmarked but I guess Ohio Brass made it judging by its mixed colors, And the last is unmarked.
Some insulators I found along a railroad no longer in use.. It is much safer to walk and hunt along no longer in use tracks. Hemingray 56 CD 203, Hemingray 42 CD and others.
Old pole top insulator pin brackets, double here for a small angle, with brown pin insulators from that era.
These are some common Porcelain insulators. What are you favorite ones? What ones are commonly used in the utility you live at? What colors are they typically (chocolate brown or sky blue...)?
Still some of these old black distribution transformers in my neighborhood, gradually fading to grey.
I thought these insulators were attractive as far as insulators go. They remind me of depression glass. Taken on a cloudy and foggy day on Cape Breton. I'm also putting it out over the wires that I'm going on a trip and my visits to Flickr will be limited for the next 10 days.
On the left is a beautiful medium cobalt blue Vidrart from Argentina. Joining it at right is a dark cobalt blue Hemingray 19.
An old telegraph line insulator - once used to help the telegraph wires working and keep those messages moving.
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One stretch of a 2 lane road in eastern Indiana still had a lot of insulators intact, I was surprised by how many there were.
with arrestor on top phase.On the old line, there was a static wire on top.The old line used a crossarm with three pintype insulators on it. the new one that replaced it uses 69kv posts, anticipating upgrade to higher voltage.
They have a small telephone museum there with this display of glass with some porcelain. Pic taken 1991.
An insulator, also called a dielectric, is a material that resists the flow of electric current. An insulating material has atoms with tightly bonded valence electrons. These materials are used in parts of electrical equipment, also called insulators or insulation, intended to support or separate electrical conductors without passing current through themselves. The term is also used more specifically to refer to insulating supports that attach electric power transmission wires to utility poles or pylons.
Some materials such as glass, paper or Teflon are very good electrical insulators. A much larger class of materials, for example rubber-like polymers and most plastics are still "good enough" to insulate electrical wiring and cables even though they may have lower bulk resistivity. These materials can serve as practical and safe insulators for low to moderate voltages (hundreds, or even thousands, of volts).
Insulators used for high-voltage power transmission are made from glass, porcelain, or composite polymer materials. Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm.[1] Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains.[2] Some insulator manufacturers stopped making glass insulators in the late 1960s, switching to ceramic materials.
Recently, some electric utilities have begun converting to polymer composite materials for some types of insulators. These are typically composed of a central rod made of fibre reinforced plastic and an outer weathershed made of silicone rubber or EPDM. Composite insulators are less costly, lighter in weight, and have excellent hydrophobic capability. This combination makes them ideal for service in polluted areas. However, these materials do not yet have the long-term proven service life of glass and porcelain.
Information sourced at.
Quite a variety of insulators in this photo! On the top row, a cobalt Russian insulator is flanked by two royal purple Canadian insulators. On the bottom row, a purple Western Glass Mfg. Co. insulator from Colorado is flanked by two miniature cobalt commemorative insulators made in Millville, NJ