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Does the fuse on the primary side of a transformer protect the secondary side?
Wiki User
∙ 11y ago
Yes, but it's usual to have fuses on both sides of the transformer.
Wiki User
∙ 11y ago
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Is it necessary to connect a fuse at the secondary side of a current transformer?
Definitely NOT! An open circuit (across a melted fuse for example) on the secondary side of a current transformer is subject to a dangerously-high voltage, so a fuse must not be fitted. The secondary side of a CT must never be open circuited.
If the fuse of the secondary side of the transformer blows what are the test to be conducted to check if the transformer is defective or not?
1st make sure the power is turned offDisconnect one lead on primary side of transformer and using an ohm meter check for continuity. You will probably get a low ohm reading if you get no reading the windings are broken and transformer is no good2nd test using ohm meter again check for winding to ground you should get no reading. If you get a ohm value the transformer is shorted to groundRepeat these tests on secondary sideWith power on and fuse removed with a voltage meter check for power on secondary sideIf it is okay turn off power and install fuseIf fuse blows again check for shorts in circuitRemember to be careful when power is turned on
What does Earth ground isolating class 2 transformer mean?
A Class II transformer is limited to not more than 60 watts. It is a low energy device and is considered "inherently limited and intrinsically safe" an integral fuse isolates primary and secondary circuits. Secondary wiring from a Class II transformer does not require conduit and clamp wiring techniques in accordance with Section 3 of the NEC. The HR-88 button lights and miniature recessed cabinet lights require this transformer.
Why current transformer secondary side short circuit?
A current transformer (or CT) is constructed in a specific way so as to step down the current in a high power circuit for measuring or protective relaying purposes. Typically, it will have a toroidal-shaped iron core with the secondary windings wrapped around it. the primary "winding" is usually the conductor of the main power system passing directly through the hole in the center of the CT. As a result of this construction, if the secondary windings are left open, a very large flux can develop, resulting in damage to the CT and possibly even the other equipment it is attached to. As such, if the CT is not going to be used, its secondary windings need to be shorted.
Why is a transformer's split phase secondary neutral grounded?
The secondary of a transformer is isolated (floating) relative to the primary, so there is no absolute reference relative to earth ground on the secondary side. By connecting the neutral to ground (earth ground that is) this creates an absolute reference. This also creates a leakage path to earth ground, now that the secondary voltage is referenced to earth ground, but that is more desirable than not because otherwise something else in the system might improperly provide that reference.
What is the ratings for a pole fuse?
There are two types of pole-mounted fuse. One type is a high-voltage fuse, intended to protect the transformer. The other type is a low-voltage fuse, intended to protect the cable or line supplied by the secondary winding of that transformer. The current ratings of these fuses depend entirely on the current ratings of the devices they are there to protect.
Why does the primary side of a step down transformer burn out and not the secondary of a 480V to 240V transformer?
Sounds like the wrong size fuse protection was used. The transformer should be protected to its kva capacity.
What position in the circuit is a fuse placed to protect a transformer?
In series to every phase winding of transformer.
What is ELSP?
An ELSP is a current limiting fuse used in series with the primary fuse of a transformer.
Is it necessary to connect a fuse at the secondary side of a current transformer?
Definitely NOT! An open circuit (across a melted fuse for example) on the secondary side of a current transformer is subject to a dangerously-high voltage, so a fuse must not be fitted. The secondary side of a CT must never be open circuited.
What safety devices are in transformer?
Some small control transformers have a built in primary fuse. Larger transformers are primary fused externally and pole transformers are primary fused externally with the fuse holders mounted on cross arms near the transformer.
If the fuse of the secondary side of the transformer blows what are the test to be conducted to check if the transformer is defective or not?
1st make sure the power is turned offDisconnect one lead on primary side of transformer and using an ohm meter check for continuity. You will probably get a low ohm reading if you get no reading the windings are broken and transformer is no good2nd test using ohm meter again check for winding to ground you should get no reading. If you get a ohm value the transformer is shorted to groundRepeat these tests on secondary sideWith power on and fuse removed with a voltage meter check for power on secondary sideIf it is okay turn off power and install fuseIf fuse blows again check for shorts in circuitRemember to be careful when power is turned on
Can you change the 1 amp fuse on a shaver adapter to a higher voltage so you can use it with something else?
Changing a fuse size does not change the voltage output. An adapter is a transformer. The transformer in this adapter has a set of turn ratios determined by the manufacturer to produce a specific secondary voltage when inputted with a specific voltage. You may be able to use the adapter on another device but it has to conform to the specifications of the adapter as it now stands. The fuse protects the primary side of the adapters transformer so as to not overload the transformer. If the fuse is up sized then the risk of overloading the adapter becomes a possibility. This could burn the windings of the transformers secondary and render the adapter useless.
What can you do as preventative maintenance for a power pole transformer so that the mineral oil does not boil?
Lower the rating of the primary fuse feeding the transformer.
What will happen to the primary winding if the secondary is shorted?
If the secondary is shorted, then it will appear that the primary is shorted as well. What happens depends on how well the protective device (fuse or circuit breaker) and transformer is designed. If the protective device is incorrectly designed, it is theoretically possible for the transformer to explode. If it is properly designed, and the transformer is also properly designed, there should be no damage at all - fix the fault - reset the trip - and you are back in business - although an inspection would probably be in order to check for latent damage.
What wires conductors would go under x lug in a transformer?
The primary side of a transformer is identified as the H side, eg. H1,H2,H3,H4. The secondary side of a transformer is identified as the X side. Eg. X1, X2. Usually X1 goes to a fuse and then to the load, X2 is usually the neutral side and is grounded to the body of the transformer.
What does Earth ground isolating class 2 transformer mean?
A Class II transformer is limited to not more than 60 watts. It is a low energy device and is considered "inherently limited and intrinsically safe" an integral fuse isolates primary and secondary circuits. Secondary wiring from a Class II transformer does not require conduit and clamp wiring techniques in accordance with Section 3 of the NEC. The HR-88 button lights and miniature recessed cabinet lights require this transformer.
