EPT - Electronic Potential Transformer
The Electronic Potential Transformer measures voltages at up to 36KV and incorporates a PWM transmitter, receiver and fiber optic links. The transmitter is directly mounted onto the high voltage bus-bars. The receiver is installed in the low voltage compartment and decodes the PWM light signals sent via the fiber optic links into a three-phase replication of the measured medium voltage.
This Advanced Electronic Potential Transformer utilizes Patent Pending "wireless" fiber-optic technology.
The need for increased safety and decreased costs and space in high voltage systems was the initiator to develop a unique product in the field of high voltage
Up to date the main measurement methods for high voltage switchgear are performed by potential transformers (primary and secondary copper winding on a steel core). The disadvantages of such systems are:
a. Lack of safety in case of a short circuit, leakage or accidental contact between the primary and secondary.
b. Large physical size forcing a complete high voltage compartment to be dedicated for the potential transformer
c. Expensive system, which requires in addition to the potential transformer, high voltage protection fuses
Technical Innovation |
Standard PT’s (status quo) |
Solcon’s EPT |
Weight and Flexibility |
Standard PT’s are based on inductive signals (copper winding on a steel core) and must be ordered for their specific operating voltage. |
The EPT is an electronic device, produced of electronic components, and can be adjusted to every voltage level with a simple field alignment. |
Safety |
Standard PT’s measure high voltage and produce signal to meters. The signal is sent to the meters via two copper wires, endangering short, accidental contact, etc. |
The EPT transmitter (installed in the high voltage compartment) does not have wires output, its output is fiber optic.
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Standard PT’s can encounter internal short which may cause High voltage to appear at its output, damaging devices connected to it. |
The EPT has fiber optic output,which could not transfer any voltage. |
Testing and performance |
Not all readily available standard PT’s are designed to pass partial discharge test. |
The EPT’s design criteria has EN 50178 as its leading requirement. Every unit passes the partial discharge test EN 50178 part HD 625.1 upon production completion. |
Additional Cost and added safety |
Requires High voltage protection fuses |
Does not require HIGH VOLTAGE fuses at all |
