Overview
The programmable electronic current burden, type 3691 is designed for efficient testing of current instrument transformers. It replaces traditional burdens which are built with passive resistances and inductances. The wide range of programmable impedances enables the emulation of prevalent national and international standard burden values as well as customer-specific values. The electronic current burden constantly monitors the applied burden accuracy and indicates any burden parameter deviation that may occur when testing an instrument transformer for accuracy, thereby minimizing errrors due to connection and handling in the complete accuracy test sytemFeatures
- Standard current ratings are covered
- Freely adjustable power steps up to 75 VA
- Power factor cos β = 0.5 to 1
- Test frequencies: 50 and 60 Hz
- High accuracy of 1 % - even with additional external passive burden type 3692 connected
- The power range can be expanded to 200 VA with an additionnal passive current burden type 3692
- The load generation principle used in the 3691 unit is electronic, not based on classical passive burdens
- The internal instrument transfomer test set resistance, input cable and contact resistances are automatically compensated by four-conductor measurement
- Remote control possibility via IEEE 488 or RS 232C interfaces
- Burden values can be retrieved from stored tables based on IEC 61869-2, ANSI C57.13 and VDE 0414 Part 2
- Nine individual burden settings (SN, IN, cos β) can be stored and retrieved as needed