4764
The high precision Current Comparators (current transformers) are used to convert high currents to a lower, measureable level.
The errors of conventional standard current transformers inevitably depend on their burden. A magnetic flux in the core produces the e.m.f. which sustains the secondary current in the burden. This disadvantage has been eliminated by the development of the two new current comparator type 4764 . An indicator winding measures the magnetic flux in the core, while an amplifier - by regulating the current in a compensating winding - ensures that the amplitude of the residual flux in the core is approximately zero. With this technique, the high precision Current Comparators will maintain typical current ratio errors below 10 ppm and current phase errors below 0.1 min on a long term basis over an extremely broad current range.
Features
- Wide measuring range with 155 primary current taps (1 … 5000 A), 2 secondary current taps (5 A/1 A), up to 200 % of the nominal current at full accuracy
- Outstanding accuracy and stability over a very broad working range (1 … 200 % IN)
- Suitable for shunt reactor losses measurement together with the 2823-REF
- Suitable for power capacitors C/tan delta measurement on high capacitance values
- Built-in overload protection with indication, overtemperature indication
- Fitted with handles and wheels for easy movement in the test field
