Voltage Transformers Suppliers, Saudi Arabia

Voltage transformers (VTs), also called potential transformers, step down system voltage to standardized secondary levels (typically 110 V) for safe measurement by metering and protection equipment. VTs are installed in medium-voltage and high-voltage switchgear across GCC power infrastructure for revenue metering, synchronization, and protection relay sensing. Procurement selection criteria include accuracy class, thermal burden, and ferroresonance suppression for cable-connected networks.

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Voltage transformers (VTs) reduce primary system voltages, often 11 kV to 33 kV or higher, to a standardized 110 V or 110/sqrt(3) V secondary output suitable for instruments, meters, and protection relays. Every metering point and protection scheme in GCC medium-voltage and high-voltage networks requires correctly specified voltage transformers.

Two main types serve different applications: electromagnetic VTs (wound transformers) provide accurate voltage replication for metering and protection, while capacitor voltage transformers (CVTs) offer a cost-effective alternative for high-voltage applications above 66 kV. In GCC utility networks, electromagnetic VTs dominate at the 11 kV to 33 kV distribution level, while CVTs are common at 132 kV and above in TRANSCO and SEC transmission substations.

Key specifications include rated primary voltage, accuracy class (0.2 or 0.5 for metering, 3P or 6P for protection), rated thermal burden, and voltage factor. For ungrounded or resistance-grounded networks common in GCC industrial plants, VTs must sustain rated voltage factor of 1.9 continuously to prevent ferroresonance-induced failures.

Procurement managers should specify VTs that match the system earthing configuration and verify the rated voltage factor covers the worst-case condition at the installation point. For outdoor installations in the Gulf, request enhanced creepage distance (minimum 25 mm/kV for coastal areas) and UV-resistant epoxy or porcelain insulation. Order VTs and CTs from the same manufacturer where possible to simplify type-testing coordination with utility authorities.

Frequently Asked Questions — Voltage Transformers

What accuracy class do GCC utilities require for voltage transformers?

Revenue metering applications typically require class 0.2 VTs per DEWA, ADDC, and SEC specifications. Protection applications require class 3P with a specified voltage factor matching the system earthing method. Dual-wound VTs with separate metering and protection secondaries are common in GCC switchgear to satisfy both requirements in a single unit.

What causes ferroresonance in voltage transformers and how do we prevent it?

Ferroresonance occurs when the inductance of VTs interacts with system capacitance in ungrounded or compensated networks, causing dangerous overvoltages. Prevention measures include using VTs with a rated voltage factor of 1.9 continuous, installing ferroresonance damping resistors on open-delta windings, or specifying anti-ferroresonance VT designs from the manufacturer.

Should we use electromagnetic VTs or capacitor voltage transformers for a 33 kV substation?

Electromagnetic VTs are preferred at 33 kV for their superior accuracy across a wide burden range and better transient response. CVTs become cost-effective at 66 kV and above. For GCC 33 kV substations, electromagnetic VTs are the standard choice specified by utility authorities.