Transformer is also called instrument transformer, it is the floorboard of the current transformer and voltage transformer.
High voltage will become low current, low voltage, high current is used to measure or protection system.
Its function is primary to high voltage or high current in proportion to transform into standard low voltage (
Small current (or standard
5 a or 1 a, all the rating)
To complete to measure the surface, to protect equipment and automatic control equipment standardization, miniaturization.
Can also be used to separate all the transformer high voltage system, to ensure the safety of person and equipment.
Ct (current transformer) current transformers can be used in the exchange of current measurement, exchange of electrical measurement and protection of electric drive circuit.
Use the transformer, vice edge is proportional to the current characteristics.
The operational principle and the equivalent circuit is the same as the general transformer, just the original winding in series in the circuit under test, and the number of turns less;
Vice edge windings current meter, relay coil current, such as low impedance loads, similar to a short circuit.
The original boundary current (
The current to be measured)
And deputy side current depends on the load circuit under test, and has nothing to do with vice side of the current transformer load.
As vice edge closer to the short circuit, so original, deputy side voltage U1 and are small and excitation current I0 is very small.
is working, vice edge is not allowed to open.
Because once open, have become primary side current excitation current, the magnetic flux and vice side voltage more than normal and endangers one's personal and equipment safety.
Therefore, vice edge is not allowed to answer the fuse in the circuit, current transformer are not allowed to work without bypass will remove the current meter, relay and other equipment.
The connection way of current transformer load according to its receive job requires confirmation.
The most commonly used connection method for single-phase, three-phase star and incomplete star.
Base structure: when the current transformer is a used to expand the range of the converter.
Use, the original edge with the circuit under test load series, pay the concatenated 5 a current meter and protection relay coil because of its primary side with thick wire, the number of turns is only a turn or a few turns, the solid and the cathode is small, low voltage, series and therefore does not change the offset current after the circuit being measured, pay a wire is very thin, number of turns a lot, but the induction electric potential is not high,
Only a few volts)
Pay current meter and relay coil resistance is very small, homework, pay edge can be regarded as short circuit condition, according to the working principle of the transformer, the ratio of the current transformer primary side current is inversely proportional to the number of turns should be: L1 / L2 = W1 / W2 or L1 = W2 / W1L2.
W2 / W1 = K2 variable voltage transformer can be in high pressure and ultra-high voltage power system used in measurement of voltage and power, etc.
Protective current transformer primary cooperate with relay device, the shortcomings such as short circuit overload, occurred in line to provide signal block defect circuit relay device, in order to protect the security of the power supply system.
Operational conditions and measurement of protection with micro current transformer transformer, a completely different transformer protection in just several times than the normal current of dozens of times current at the time of the beginning effective operation.
Base structure: special transformer voltage range is extended, base structure and general transformer is the same.
So the voltage transformer primary side and pay electric voltage U1, U2 = W1 / W2.
Measuring current transformer primary cooperate with measuring surface, in a line normal operation condition, which is used to measure current, voltage, power, etc.
Measuring the micro current transformer primary requirements: (1) insulation and reliable;
(2) the measuring accuracy of high enough;
(3) when the circuit being measured when the shortcoming of large current transformer should be in appropriate range full (
If 500% of the rated current)
In order to protect the measuring surface.
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