Potential Transformers - Electrical, Lighting and Power
Potential transformers (PTs), also called voltage transformers (VTs), are instrument transformers used on ships to step down medium or high system voltage for safe metering, protection, synchronizing, and control. Marine units are designed for switchboards, generators, transformers, shore connections, and power distribution systems.
ProShipWorks provides end-to-end support to source and supply Potential Transformers for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Potential Transformers |
|---|---|
| Product Category | Electrical, Lighting and Power |
| Product Reference | 603 |
| Brands / Manufacturers | ABB, Siemens, RITZ Instrument Transformers, Arteche, Schneider Electric |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Galvanically isolates measuring and protection circuits from high voltage |
| 2. Available for single-phase or three-phase marine switchboards |
| 3. Secondary outputs commonly rated 100 V or 110 V |
| 4. Suitable for metering, relay protection, synchronizing, and voltage indication |
| 5. Available as indoor air-insulated or cast-resin constructions |
Applications of Potential Transformers
| Application |
|---|
| 1. Main and emergency switchboard voltage measurement |
| 2. Generator, transformer, and shore-power protection systems |
| 3. Synchronizing, power management, metering, and under/over-voltage protection |
Models & Manufacturers
| Model | Manufacturer |
|---|---|
| TPU 4 | ABB |
| 4MR | Siemens |
| VJ Series | RITZ Instrument Transformers |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| Typical marine voltage transformer | Primary voltage | Application-dependent, commonly 3.3 to 15 kV for medium-voltage marine systems | kV |
| Typical marine voltage transformer | Secondary voltage | 100 or 110 | V |
| Typical marine voltage transformer | Frequency | 50 or 60 | Hz |
| Typical marine voltage transformer | Metering accuracy class | 0.2, 0.5, or 1.0, depending on application | — |
| Typical marine voltage transformer | Protection accuracy class | 3P or 6P, as specified for the protection system | — |
| Typical marine voltage transformer | Insulation construction | Cast-resin or air-insulated | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | IEC 61869-1 and IEC 61869-3 are the principal standards for instrument transformers and inductive voltage transformers. Marine installation requirements may additionally reference the IEC 60092 series, applicable flag-state rules, and the approved switchboard design. |
|---|---|
| Class Approval | Marine type approval or product acceptance may be available from DNV, ABS, Lloyd's Register, Bureau Veritas, RINA, and ClassNK, subject to the manufacturer, voltage level, installation, environmental category, and project requirements. Approval must be verified for the exact part number. |
Installation, Maintenance & Safety Information
| Installation Notes | Install according to the approved single-line diagram, wiring diagram, polarity markings, and manufacturer instructions. Connect the secondary circuit to the specified protective earth at one designated point. Never short-circuit an energized voltage-transformer secondary or exceed its insulation and burden ratings. |
|---|---|
| Maintenance Tips | Inspect terminals, insulation, earthing, enclosure condition, and signs of overheating or moisture during planned switchboard maintenance. Verify secondary voltage, fuse condition, polarity, insulation resistance, and protection or metering performance using approved test procedures. |
| Safety Notes | Treat the primary and secondary circuits as hazardous. Isolate, lock out, and prove dead before work. Discharge and earth the high-voltage side where required, use correctly rated fuses and test equipment, and follow vessel electrical safety procedures. |
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