Abstract
Contactless capacitive sensors are applied to monitor
(over)voltages near the overhead line terminations of a
substation or at cable to line transitions. The sensor response is
the signal time derivative when loaded with a resistive
impedance and the waveform is restored by integration. As part
of this differentiating/integrating (D/I) measuring concept, the
use of open-air sensors results in excellent EMC characteristics
but the inherent cross-coupling to other phases has to be dealt
with. Three applications are presented: 1) For a 150 kV cable
termination the partial discharge activity needs to be related to
momentary phase voltages; 2) Measured slow front overvoltage
at a 380 kV cable termination from line energization
are compared with predictions from numerical simulation; 3)
The perspectives of employing the D/I method for (very) fast
front overvoltages near a 380 kV circuit breaker are examined.
(over)voltages near the overhead line terminations of a
substation or at cable to line transitions. The sensor response is
the signal time derivative when loaded with a resistive
impedance and the waveform is restored by integration. As part
of this differentiating/integrating (D/I) measuring concept, the
use of open-air sensors results in excellent EMC characteristics
but the inherent cross-coupling to other phases has to be dealt
with. Three applications are presented: 1) For a 150 kV cable
termination the partial discharge activity needs to be related to
momentary phase voltages; 2) Measured slow front overvoltage
at a 380 kV cable termination from line energization
are compared with predictions from numerical simulation; 3)
The perspectives of employing the D/I method for (very) fast
front overvoltages near a 380 kV circuit breaker are examined.
| Original language | English |
|---|---|
| Pages (from-to) | 70-75 |
| Number of pages | 6 |
| Journal | Proceedings of the Nordic Insulation Symposium |
| Volume | 26 |
| DOIs | |
| Publication status | Published - 8 Aug 2019 |
| Event | 26th Nordic Insulation Symposium on Materials, Components and Diagnostics, NORD-IS 19 - Tampere, Finland Duration: 12 Jun 2019 → 14 Jun 2019 Conference number: 26 |