Special Equipment Supply
HIGH CURRENT COAXIAL COMPENSATED SHUNTS
High Power testing laboratories need accurate high current transducers for short-circuit currents measuring during test execution. The most important requirements for these sensors must be:
- the capacity to withstand very high electro-dynamical stresses,
- a low measuring uncertainty,
- a non-inductive measurements of high current,
- a low response time to transient current phenomena.
DeMEPA Coaxial Compensated Shunts fully meet the above requirements. The design concept of DCCS is based on a tubular construction with coaxial return in order to assure the characteristic to be a non-inductive sensor.
Two tubes, inner by resistive material and outer by copper, shall be strongly connected at one end. The current to be measured shall flow through the resistive tube and the external coaxial tube with an opposite and symmetrical path, thus minimising the overall inductance.
The Shunts have bulk structure design to withstand the electro-dynamic stresses associated to very high peak currents and to minimize the variation of resistivity due to temperature rise. This ensures low measurement uncertainty.
DeMEPA Shunts find application in the measurements of high currents having impulsive (a few periods at power frequency) or short-time period durations. They are of particular usefulness in the synthetic tests where it is crucial that the arc current during the interaction period (around the zero of the test current) can exhibit high frequency transient. Such transient are essential in the successful process of the current breaking: the interpretation of the breaking phenomena requires an accurate and reliable measurement of the interaction current. According to DeMEPA experience a measurement bandwidth up to 50 kHz is required.
DeMEPA is able to supply High Current Coaxial Shunts with the following technical characteristics:
- Max measured Short-Circuit Current: up to 250 kA rms, 1 s; up to 625 kA peak
- Measurement uncertainty: not higher than 0,5%
- Bandwidth: up to 50 kHz