What is CT PT metering unit?
Combined CTPT unit are also called metering units. These units can be offered as Dry Type or Oil Immersed and are generally pole mounted. The units are available in three phase three wire or three phase four wire system. CT: PT unit used for single or double metering with trivector meter and energy meter.
What is CT and PT in energy meter?
A current transformer (CT) is used for measurement of alternating electric current for energy meter. Current transformers, together with voltage (or potential) transformers (VT or PT), are known as instrument transformers.
What is CT ratio in meters?
Every current transformer, or CT, has a ratio. A typical CT ratio might be 200:5 or 400:5. What this means is that a CT will step down higher current levels to a level that the meter can safely handle. If we use the same 400:5 CT as above, our meter multiplier would be 400 divided by 5, or 80.
What is CTPT set?
Metering Sets (CTPT) combination of Current Transformers & Potential Transformers. ENERGY TEC manufactures Outdoor Oilcooled CTPT combined Metering unit upto 33KV for customer requirements as per IS 2705/1992 & IS 31546/1992, IS 60044(1) & IS 60044(2), and IEC 61869 (1) & IEC 61689(2).
How do CT and PT work?
CT is used to measure current while PT is used to measure voltage. CT is connected in series while PT is connected in parallel. CT ratio range is from 1 to 5A while the PT range is from 110V. We connect the output parameter from CT to the ampere meter while we connect the PT output to the voltmeter.
How is CT PT ratio calculated?
Calculate the CT ratio. The CT ratio is the inverse of the voltage ratio. In this example, the voltage ratio is 1:5, so the CT ratio is 5:1. This means the current level is stepped down 5 times where, if the primary current is 200 amps, the CT output is 40 amps.
How do you calculate CT to PT ratio?
PT’s and CT’s step down the line currents and voltage to much safer levels. To connect to these circuits, we need to know the step-down ratio. Voltage is a simple division answer, simply divide a 1:1 PT ratio value into the known line voltage; For example; 4160 / 120 = 34.66 or 35:1.
How do you calculate PT ratio?
You can determine the PT ratio by dividing the phase-to-phase voltage, which is 4,160V, by the voltmeter full-scale range, which is 150V. This simple calculation results in a value of 27.7, which you would interpret as an approximate 28:1 ratio.
How do you calculate metering?
Multiply the length and width together. Once both measurements are converted into meters, multiply them together to get the measurement of the area in square meters. Use a calculator if necessary. For example: 2.35m x 1.08m = 2.538 square meters (m2).
What is the difference between metering CT and protective CT?
These are noticed by their brown color in the circuit.
What is the CT of protection and CT of metering?
Protection Current Transformer (CT) and Metering CT are two different types of CT as per their requirement and hence design. Therefore, Protection class CT should not be used as Metering CT. Similarly, a Metering Current Transformer should not be used for protection purpose. Let the discuss the reason behind this.
What is the CT class use for metering?
Current transformers are used for both metering and protection purposes.
What is CT and PT in transformer?
The current transformer and potential transformer (also called voltage transformer) are both measuring devices. A CT lowers the current signals for measurement purposes, while a PT lowers high voltage values into lower ones.