EVT is a smart replacement for a traditional voltage transformer
The same result — 100 V/√3 voltage with accuracy class 0.5. But without kilograms of copper and iron, without dangerous resonance phenomena and without a separate compartment for installation. One Cable Connector Insulating Plug, or a voltage sensor instead of a support insulator, and a DIN-rail unit replace an entire device.
What You Get by Choosing EVT
Six strong reasons to switch to an Electronic Voltage Transformer on your next project
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Forget Ferroresonance ForeverIn 7.2–40.5 kV networks with an isolated neutral, ferroresonance is the main threat. EVT contains no ferromagnetic circuit, so resonance is eliminated by design. No additional protection, no emergency shutdowns -
Space Saving. No Separate Panel RequiredA traditional VT weighs 30–80 kg, requires installation on a reinforced base, lifting equipment for mounting and a separate panel for placement. EVT is a Cable Connector Insulating Plug screwed into a cable connector, or a support voltage sensor installed instead of a support insulator. Installation takes minutes, not hours -
One Device Instead of TwoBuilt-in zero-sequence voltage measuring channel 3U₀ with accuracy class 1/3P. No separate zero-sequence voltage transformer is required — saving space in the switchgear, reducing cable connections and equipment cost -
Full Compatibility with Your Systems100 V/√3 output — the same signal as from a traditional VT. All your protection relays, meters and measuring instruments operate without changes. Simply replace the VT with EVT — everything else remains the same -
Accuracy You Can TrustPhase voltage accuracy class — 0.5, matching the performance of traditional VTs, while the phase displacement does not exceed 1°, compared with 3–10° for electromagnetic devices. Accurate measurement means reliable protection -
Savings at Every StagePower consumption is not more than 10 W, compared with 30–50 W no-load losses for a traditional VT. Over 15 years of operation, one EVT can save up to 40% of electricity
Comparison: EVT vs Traditional VT
The figures speak for themselves
| Parameter | Traditional VT | EVT Set |
|---|---|---|
| Operating principle | Electromagnetic induction | Capacitive divider + electronics |
| Weight | 30–80 kg | Cable Connector Insulating Plug + DIN-rail unit |
| Installation | Foundation, crane, separate room | Screw-in installation into a cable connector + DIN rail |
| Ferroresonance | Possible, requires protection | Eliminated by design |
| Saturation during short circuit | Possible | Absent |
| 3U0 channel | Requires a separate VT | Built-in, class 1/3P |
| Phase voltage accuracy | 0.5–1.0 | 0.5 |
| Phase displacement | 3–10° | ≤1° |
| Power consumption | No-load losses: 30–50 VA | ≤10 W |
| Digital substations | Analog interface only | Direct readiness |
Operating principle
Traditional VT
Electromagnetic induction
EVT Set
Capacitive divider + electronics
Weight
Traditional VT
30–80 kg
EVT Set
Cable Connector Insulating Plug + DIN-rail unit
Installation
Traditional VT
Foundation, crane, separate room
EVT Set
Screw-in installation into a cable connector + DIN rail
Ferroresonance
Traditional VT
Possible, requires protection
EVT Set
Eliminated by design
Saturation during short circuit
Traditional VT
Possible
EVT Set
Absent
3U0 channel
Traditional VT
Requires a separate VT
EVT Set
Built-in, class 1/3P
Phase voltage accuracy
Traditional VT
0.5–1.0
EVT Set
0.5
Phase displacement
Traditional VT
3–10°
EVT Set
≤1°
Power consumption
Traditional VT
No-load losses: 30–50 VA
EVT Set
≤10 W
Digital substations
Traditional VT
Analog interface only
EVT Set
Direct readiness
Technical Documentation by Series
EVT-C Series. Sensors in the form factor of a Cable Connector Insulating Plug for interface C cable connectors according to EN 50181. Complete technical characteristics, drawings and connection diagrams.
EVT-D Series. Support insulators with integrated voltage sensor function. Complete technical characteristics, drawings and connection diagrams.
