Replace expensive conventional voltage transformers with compact ohmic divider technology. 50-60% cost saving, zero ferroresonance risk, Class 0.5 accuracy.
Cost Saving vs Conventional VTs
Per Sensor (vs 15-30 kg)
Revenue Metering Accuracy
Uncontrolled voltage oscillations cause core saturation, overheating, and insulation failure — the #1 cause of in-service VT failures.
Each VT weighs 15-30 kg and requires a separate measuring compartment, driving up switchgear cost and size.
Premium pricing, extended delivery, and specialised commissioning add significant project cost and lead times.
A two-component system: compact ohmic divider sensors paired with a precision voltage booster amplifier.
Resistive network — no inductance means resonance is physically impossible.
Lower capital cost, no dedicated compartment, simpler commissioning.
Fits inside existing cable terminations or busbar chambers.
Revenue metering, protection, and synchronisation ready.
OAS for gas-insulated, OKE for air-insulated switchgear.
Standard secondary output from the booster amplifier.
Specification |
Conventional VT |
EZY-VS System |
|---|---|---|
Weight per sensor
|
15 - 30 kg
|
0.75 kg
|
Ferroresonance risk
|
High - leading failure mode
|
Zero - physically impossible
|
Cost
|
$$$
|
50-60% less
|
Dedicated compartment
|
Required
|
Not required
|
Accuracy class
|
Class 0.5
|
Class 0.5
|
Output voltage
|
110 VAC/√3
|
110 VAC/√3
|
Voltage range
|
Varies by model
|
6.6 kV - 33 kV
|
Revenue metering
|
Yes
|
Yes - Class 0.5 certified
|
Installation complexity
|
High - heavy, needs compartment
|
Low - fits inside cable terminations
|
Lead time
|
Extended
|
Available ex-stock
|
Component 1: |
Ohmic Divider Sensors |
|---|---|
Manufacturer
|
Kries Energietechnik (TE Connectivity)
|
Types
|
OAS (gas-insulated / cable) | OKE (air-insulated)
|
Weight
|
0.75 kg per sensor
|
Output
|
3.25 V/√3 via coaxial BNC
|
Voltage range
|
6.6 kV to 33 kV
|
Accuracy
|
Class 0.5 (sensor + controller calibrated)
|
Mounting
|
Inside cable terminations or busbar chambers
|
Connector compatibility
|
Nexans, Suedkabel T-plug systems
|
Component 2: |
Voltage Booster Amplifier |
|---|---|
Input
|
3.25 V/√3 (three-phase)
|
Output
|
110 VAC/√3 (standard secondary)
|
Auxiliary supply
|
24 - 240 VAC/DC
|
Accuracy
|
Class 0.5
|
Dimensions
|
220 x 116 x 81 mm
|
Weight
|
600 g
|
Mounting
|
Standard 35 mm DIN rail
|
Output cable
|
ALVERN IP005004 (4-pair screened)
|
Critical: Use ALVERN IP005004 4-pair individually screened cable for booster output connections.
Class 0.5 revenue metering deployment replacing traditional VT infrastructure across multiple sites.
MV synchronisation and metering for embedded generation packages.
Revenue metering certified
Quality management system
Precision sensor manufacturer
The EZY-VS is a two-component voltage measurement system consisting of compact ohmic divider sensors and a precision booster amplifier. It replaces conventional electromagnetic voltage transformers (VTs/PTs) in medium voltage switchgear by using resistive voltage division instead of electromagnetic transformation. The sensors weigh just 0.75 kg (compared to 15-30 kg for a conventional VT) and produce a standard 110 VAC output suitable for protection, metering, and synchronization equipment.
Ferroresonance occurs when parasitic capacitances in the primary circuit resonate with the inductance of a conventional electromagnetic VT. Since the EZY-VS uses an ohmic (resistive) divider network with no inductance whatsoever, the resonance condition cannot physically occur. This eliminates the most common cause of VT failure in service.
Yes. The EZY-VS system achieves Class 0.5 accuracy when the sensor and booster amplifier are calibrated together. This meets the requirements for revenue metering applications in South Africa. It is already deployed in revenue metering installations by Jacaranda Metering.
The EZY-VS is available for systems from 6.6 kV to 33 kV. The appropriate sensor type is selected based on the application: OAS type for gas-insulated switchgear and cable terminations, or OKE type for air-insulated switchgear installations.
The EZY-VS system typically costs 50-60% less than conventional voltage transformer solutions. The cost saving comes from the lower sensor cost, elimination of dedicated mounting compartments, reduced switchgear enclosure size, and simpler commissioning. OEM volume pricing is available for manufacturers integrating the system into their standard product range.
Use ALVERN IP005004 4-pair individually screened cable for all booster output connections. This is critical because inter-core capacitance in unscreened cable can cause phase shift errors that affect measurement accuracy. The screened cable prevents crosstalk between phases and maintains the Class 0.5 accuracy specification.
Contact us for a free technical consultation.
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