ANSI metering class
Thus once the secondary is brought to resonance the output voltage from the secondary and compensating windings is constant and it is under these conditions that the transformer is used.
AISO Electric Supply Cost-effective Price JDZW-10(6)R Voltage Transformer produces an increase in the leakage reactance of the secondary and this approaches a value which resonates with the capacitor connected across it. As the condition of resonance is reached the secondary current rises rapidly saturating the lower portions of the magnetic circuit. In addition the input (or primary) and output (or secondary) transformer windings are physically separated. ANSI metering class transformers are designed especially for power-monitoring applications where high accuracy and minimum phase angle error are required.
The primary flux links the secondary and induces a voltage in the secondary windings proportional to the turns ratio. When a voltage is applied across a primary winding, a magnetizing current establishes the primary flux in the core. Magnetic circuit of voltage transformers VTS 12 is made of oriented transformer strips in the shape of C” of core.
The values of secondary voltage are 100/√3, 110/√3, 120/√3, 100/3, 110/3, 120/3 V. The accuracy classes for measuring winding are 0.2, 0.5, 1, 3, for the securing winding are 3P and 6P. The transformers satisfy required accuracy class at intervals from 25% to 100% of rated load. Power Voltage Transformers are designed with exceptional longevity and reliability, aiming for at least 50 years of service life. Metering style PTs are designed with smaller cores and VA capacities than power transformers.
Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels. These transformers are mainly used to measure the voltages between the ground and an electrical circuit and between the ground and a neutral point in an electrical circuit, as well as to detect zero-phase voltage in the event of a grounding fault of a three-phase circuit. Discover our range of dry-type, oil and power transformers from medium voltage up to 170kV.
^ With turns of the winding oriented perpendicularly to the magnetic field lines, the flux is the product of the magnetic flux density and the core area, the magnetic field varying with time according to the excitation of the primary. Induction coils with open magnetic circuits are inefficient at transferring power to loads Until about 1880, the paradigm for AC power transmission from a high voltage supply to a low voltage load was a series circuit. 39 Large power transformers use multiple-stranded conductors as well, since even at low power frequencies non-uniform distribution of current would otherwise exist in high-current windings.
24 Core form design tends to, as a general rule, be more economical, and therefore more prevalent, than shell form design for high voltage power transformer applications at the lower end of their voltage and power rating ranges (less than or equal to, nominally, 230 kV or 75 MVA). Power transformer over-excitation condition caused by decreased frequency; flux (green), iron core’s magnetic characteristics (red) and magnetizing current (blue).