superimposedimpulse voltage testingon extrudeddc-cables ......accordingiec 62895 andreas voß,...
TRANSCRIPT
1Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Superimposed Impulse VoltageTesting on extruded DC-Cables
according IEC 62895
Andreas Voß, Michael GamlinHaefely Test AG, Basel, Switzerland
2Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
3Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
4Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Superimposed Impulse Voltage Test
§ UP1: DC + opposing LI§ UP2,S: DC + same SI§ UP2,O: DC + opposing SI
§ Cigré recommendations(WG B1.32, TB 496):§ UP1 = 2.1 * UDC
§ UP2,O = 1.2 * UDC
Source: IEC 62895
5Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
6Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Composite Voltage Tests2 Options
UIMP∧ UDC =
7Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
8Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Coupling Capacitor vs. Sphere Gap
§ Sphere Gap:
è Sphere gap is a cheap and easy solution but not a sophisticated one
Sphere Gap Extinction
Sphere Gap Refiring
Sphere Gap ExtinctionCable is completely discharged
Slow DC recharging
9Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Coupling Capacitor vs. Sphere Gap
§ Coupling Capacitor:
è Coupling Capacitor is the technically superiorsolution
After the impulse, the test objectvoltage returns to full DC level
10Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
11Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Composite Measuring System
20 nF
50 MW
1 GW
> 200 nF
UIMP∧ UDC =
12Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Agenda
§ Superimposed Impulse Voltage Test§ Composite Voltage Tests§ Coupling Capacitor vs. Sphere Gap§ Composite Measuring System§ Conclusion
13Andreas Voß, 15. Symposium Energieinnovation Graz 2018
Conclusion
UIMP= ∧UDC
∧CouplingResistor
CouplingCapacitor
Test Object
Universal VoltageDivider
Composite Voltage
Measurement
Impulse VoltageGenerator
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