transformer protection Flashcards
One of the two internal components that protect a CSP transformer is the ?
secondary breaker
CSP transformers do not have an internal primary fuse and rely on a pole mounted open-link fuse for protection.
false
A follow-through current initiated by ? may overheat a transformer.
lightning
A short-circuited secondary, an overload, or a(n) ? current are the usual causes for a transformer to overheat.
induced
An oil-filled transformer can withstand an overload of ? times the rated current for two seconds.
25
The KVA rating of a transformer decreases 3% for each degree below 30°C.
false
A transformer can carry more current in January than in June.
true
A transformer fuse is coordinated so it will isolate a transformer before ?
upstream protection opens the primary circuit.
A ? fuse reduces nuisance fuse blowing from transient faults.
t-link
Fuse size and speed are specified by the utility.
true
A surge arrestor is installed after the transformer primary terminal in order to stop overcurrent.
false
An isolation link of an underground transformer can be easily replaced in the field.
false
The rating of a surge arrestor is specified at ? voltage as the circuit.
slightly higher
The neutral and ground connections are interconnected on a transformer and are therefore interchangeable.
false
A neutral is a grounded conductor while a ground wire is a(n) ? conductor.
grounding
