There are situations where the secondary of a transformer is not grounded and the neutral is not connected to the neutral of the primary. This can cause a potential shock hazard so the secondary side needs to be protected.
Instrument Transformer
An rcd is a device designed to limit duration of electrical shock by disconnecting the circuit when a fault is detected. An isolation transformer is a 1 to 1 (same voltage and current in and out) transformer that keeps one part of an electrical system physically unconnected to another part of the system. It does this by using the principle of a transformer to allow current flow, without actually connecting the load to the source wires.
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.
I suppose it could, but then it wouldn't be purely an isolation transformer. It would then be a isolation and either step up or step down transformer.
The abbreviation, 'PT', stands for 'potential transformer' (in Britain, the abbreviation is 'VT', and stands for 'voltage transformer'). This, together with a 'current transformer', falls into a category of transformer known as 'instrument transformers'. A 'PT' or 'VT' is used to reduce a high voltage to a level of voltage that can be safely read, remotely, by regular a.c. voltmeters or to provide inputs to high-voltage protection relays, while electrically- isolating the secondary circuit from the high-voltage primary circuit for the purpose of safety.
By connecting a voltmeter across the secondary terminals of the voltage/potential transformer. The transformer acts to reduce the voltage applied to its primary winding, while electrically-isolating the primary (usually high-voltage) circuit from the voltmeter.
Instrument Transformer
Helps with the starting of large electric motors.AnswerAn autotransformer is a transformer with a single winding, rather than two separate windings. It can be used as a step-up or as a step-down transformer, provided there is no requirement for electrically-isolating the secondary circuit from the primary circuit.
An rcd is a device designed to limit duration of electrical shock by disconnecting the circuit when a fault is detected. An isolation transformer is a 1 to 1 (same voltage and current in and out) transformer that keeps one part of an electrical system physically unconnected to another part of the system. It does this by using the principle of a transformer to allow current flow, without actually connecting the load to the source wires.
Transformers use magnetic induction between 2 coils of wire to produce a voltage in the secondary winding. Typically the main purpose of a transformer is to step up or down the voltage by having differing number of windings between the primary and secondary coils. A secondary effect is to keep the 2 systems electrically isolated from eachother. If one of the phases becomes grounded, the ground is only seen on the portion of the system downstream of the transformer, thus increasing relibability.
Any reference to isolating electrical components, an insulator is the first choice.
cannot be used as an isolating transformer, because is has common winding.
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.
I suppose it could, but then it wouldn't be purely an isolation transformer. It would then be a isolation and either step up or step down transformer.
The abbreviation, 'PT', stands for 'potential transformer' (in Britain, the abbreviation is 'VT', and stands for 'voltage transformer'). This, together with a 'current transformer', falls into a category of transformer known as 'instrument transformers'. A 'PT' or 'VT' is used to reduce a high voltage to a level of voltage that can be safely read, remotely, by regular a.c. voltmeters or to provide inputs to high-voltage protection relays, while electrically- isolating the secondary circuit from the high-voltage primary circuit for the purpose of safety.
isolation if you are in the usa and must service electronics the neutral is grounded the power supply is a voltage doubler one side is 170v+ to ground the other is 170v negative to ground so if you run the power thru the transformer first you stand a better chance of staying alive these transformers are quite often used to trigger scrs or triacs for the same reason
You can get Shure e2c sound isolating earphones from your local electrical or computing stockist. Failing that, you can try sites such as Amazon or eBay.