The Power Quality Network is a database for electrical material typically used by electrical utilities and large industrial plants. This website is a portal for publishing information on equipment, structures, methods and standards related to the low, medium and high voltage electrical power systems. The information within the site is organized into an Ontology. An Ontology is a formal way of defining information entities and their interrelationships with one another.
We hope it becomes an useful tool for electrical engineers at utilities, EPC, and in industry.
The first database we have started, is with Medium Voltage Separable Cable Accessories and you can view it in the Materials Section.
Loop Feed, Single Phase, Primary Deadfront, Distribution, Padmount, Transformer, Structure
A Loop Feed, Single Phase, Primary Deadfront, Distribution, Padmount, Transformer, Structure is typically installed along feeders underground residential developments (URD's). Padmounted transformers step down the voltage to feed one or multiple service drops of the secondary bushings. Many padmounted transformers may serve a single large building, or it may serve many residences.
They housed in a locked metal enclosure that give the transformer a tamper-resistant rating. They typically rest on a concrete pad with conduit openings so that incoming and outgoing cables can be brought into the termination compartment from underground. Almost all padmounted transformers are oil filled type.
On the primary (high) side of the transformer they will have two medium voltage bushings (H1A and H1B), one set for the incoming feed and one for the outgoing feed. This means there are two bushings for one phase to allow the customer allow the customer to connect all of their transformers in a loop configuration.
A typical enclosure includes a tank for holding the core/coil assembly of the padmounted transformer immersed in oil or the like, and a wiring cabinet having high and low voltage wiring compartments for enclosing the high and low voltage bushings, respectively, of the transformer, etc.
The 200A loadbreak seperable elbow connector is suitable for connecting URD underground cable to URD transformers and switchgear. It provides a deadfront submersible cable connection. These elbows are submersible so they are especially useful in all subway and subsurface transformer primary connections, and connections to various types of equipment such as vacuum switch and interrupters.
Loadbreak and load make operations require the aid of a live-line tool (shotgun stick with elbow puller).
For application on ungrounded WYE or delta systems, the next higher voltage class product is recommended, for instance on a 15KV delta, the 25KV elbow should be used. Their ratings are always line-to-line, so a 15kV elbow will only be rated 8.6KV Line-to-Ground, so a 15kV delta will exceed the rating of the elbow.
The elbows kits are cable size sensitive due to the elbow lug needs to be crimped to the connector, and the elbow housing needs to provide a water tight seal around the cable insulation.