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# Is the dot on ct line or load side?

Updated: 9/20/2023

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Q: Is the dot on ct line or load side?
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### Side effects of contrast dye for ct scan?

Side effect of cervical ct scan?

### Why droop ct used in generators?

Droop CT is used to control load sharing of the reactive power b/w paralleled generators.

### What is the effect of using a current trasformer CT meant for 630A breaker maximum load for 1200A breaker maximum load in relation to current measured and protection relays?

No good idea. The CT may not function well at a load beyond 630 amps. It may even fail at higher load (than 630 amps)

### Where is the bobcat located in CT?

Just saw one in Foster, RI, not far from the CT line.

### Why is polarity test done?

On the CT there will be a white dot that represents a polarity mark. This is used to connect to the correct polarity terminal on the device that the CT is connected to. Additional CT transformers must be connected to the recording or monitoring device using the same polarity as the first CT.

### What is the use of SCM ct in generator?

SCM CT is a normal CT which is connected in two phase of the turbines &amp; its terminals are connected to the AVR. Depending on the load on the turbine the current increases &amp; accordingly it gives the input to the AVR so as to develop the required field to generate the same load without any dip in the voltage.

### How do you calculate burden resistor fo current transformer?

The method I have seen employed is to estimate the maximum current that will flow in the secondary side of the CT due to fault currents on the primary side, and calculate the total load (resistance) on the secondary side, including the CT resistance, cable resistance (2 way for ground faults, 1 way for three phase and L-L), resistance of any meters/relays connected to the CT. Once this is known, the voltage rise in the CT can be determined to see if the CT is likely to saturate.Alternately, you can determine the VA burden by the above, VA = V*I = (I*R)*I, using Ohm's law.The above answers the question of how to calculate the VA burdon on a current transformer. The VA burden of a CT is determined by the resistivity of the CT, multiplied by the current squared through the secondary. In general, this will be provided by the manufacturer in the form of a CT burden characteristic, developed through testing of the CT in question, not through calculations.

yes, true

### Is CT use high or low voltage and if it depends on application or not?

A current transformer (CT) is used to reduce a load current to a value that can be read by conventional instruments such as ammeters and wattmeters; it also enables the instruments to be located remotely. In the case of high-voltage circuits, a CT also electrically-isolates its burden (secondary load) from the primary circuit.

### What is CT operated electronic relay?

CT (Current Transformer ) is essential whether is electronic relay or electromagnetic relay. A relay requires the CT to sense the line current.

### Why would a power transformer trip on restricted earth fault?

because current entering ct's of High Side is not equal to low side ct's output current