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How do you measure if a transformer is functional without applying voltage?
Wiki User
∙ 14y ago
The short answer is you can't. The long answer is that it is possible with the appropriate tools but still involves applying an AC voltage to the input terminals and observing what happens on the output terminals, but it may not be necessary to use dangerous voltage levels to do this.
Why?
A transformer relies for its operation on a continuously varying magnetic field. The field is induced by current passing through the primary, driven by the applied AC voltage. It in turn induces current flow in the secondary coil, wound concentric to the input. This induction only happens as the magnetic field changes, and you can only get a changing magnetic field by flowing current through the input, and that can only happen by applying an AC voltage to the input. The magnitude of the output voltage is related (to a first approximation, with no secondary load) to the input by the simple ratio of the number of turns in the secondary coil divided by the number of turns in the primary times the input voltage.
This can not be tested using an Ohm meter. There are three basic kind of current flow - resistive, capacitative, and inductive. An Ohm meter can only measure resitive current flow. The other two require special meters known as L or C meters. The ideal transformer windings read pretty close to 0 Ohms resistively, so it is very difficult to tell if there are any short circuits between windings. An L meter can tell if there is in fact any magnetic capability. But the only true test is to input AC and measure the output with an AC volt meter. Or take it apart and see if it was OK (it won't bbe after you took it apart, of course!).
That said, an ohm meter will tell you if either coil is broken (open circuit). Some Transformers have one terminal of each coil tied to a common ground so an ohm test will not tell you if that is the case (OK) or if there is an umintended short between the coils (not OK).
Wiki User
∙ 14y ago
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What is the function of capacitor voltage transformer at the switch yard?
function of capacitive voltage transformer is measure high transmission voltage with low range voltmeter and oprate the relay circuit to oprate CBs.
How you can check load connected of transformer?
Measure the current and voltage on the secondary side.
What is a transformer that increases voltage?
A transformer that increases voltage is a step-up transformer.
How can measure transformer KVA?
the capacity of a transformer is defined as a product of voltage and current flowing through it.AS THE CURRENT IS MEASURED IN AMPERES AND VOLTAGE IN VOLTS, Hence transformers are measured/rated in KVA
Is line voltage or phase voltage mentioned on transformer nameplate?
It depends how they are connected. If they are connected between line conductors then they are measuring line voltages. If they are connected across phases then they are measuring phase voltages.
What is the function of capacitor voltage transformer at the switch yard?
function of capacitive voltage transformer is measure high transmission voltage with low range voltmeter and oprate the relay circuit to oprate CBs.
How you can check load connected of transformer?
Measure the current and voltage on the secondary side.
How potentiotial transformer measure voltage?
A potential transformer (US terminology) or voltage transformer (UK terminology) operates on the same principle as any mutual transformer, but with the secondary windings connected across the terminals of a voltmeter. The secondary voltage, which is determined by the turns-ratio of the transformer, is usually standardised to match the full-scale deflection of the voltmeter.
What is the difference between power transformer and instrument transformer?
A power transformer is used to provide power (to your home, for example), an instrument transformer is used to measure voltage or current (for metering, for example).
What is a transformer that increases voltage?
A transformer that increases voltage is a step-up transformer.
How can measure transformer KVA?
the capacity of a transformer is defined as a product of voltage and current flowing through it.AS THE CURRENT IS MEASURED IN AMPERES AND VOLTAGE IN VOLTS, Hence transformers are measured/rated in KVA
Is line voltage or phase voltage mentioned on transformer nameplate?
It depends how they are connected. If they are connected between line conductors then they are measuring line voltages. If they are connected across phases then they are measuring phase voltages.
The incoming voltage from the current source to the transformer is called what?
The incoming voltage from the source to the transformer is called primary voltage.
Does the transformer require exactly 230V as an input supply else can we use 50V as the input for it?
You can apply a lower-than-rated voltage to the primary winding of a transformer, and the secondary winding will then alter by the same proportion. So, for example, for a step-down transformer, if a 230-V primary voltage results in, say, a 115-V secondary voltage, then applying a 50-V primary voltage will result in a 25-V secondary voltage.
What is the main different between the power transformer and voltage transformer?
Voltage Tarnsformer transforms only voltage. While power transformer transforms both voltage and current.
How potential transformer works explain with circuit diagram?
A potential transformer steps the high voltage down to a level of 120 V to measure them safely and easily.
When is a step up transformer used in relationship as to when a step down transformer is used?
If the voltage needs to be increased from a lower voltage to a higher voltage a step up transformer is used. If the voltage needs to be lowered from a higher voltage to a lower voltage a step down transformer is used.
