Transmission Equipment

Potential Transformer (PT / VT)

▶  Practice Flashcards 🔌  Practice in One-Line Academy ▶  SLD Symbol Flashcards

Definition

An instrument transformer that produces a secondary voltage precisely proportional to the primary line-to-line or line-to-ground voltage, stepped down to a safe, standard level (typically 120 V secondary) for use by protective relays, revenue meters, and control systems. PTs (also called Voltage Transformers or VTs) allow relays and meters to monitor transmission voltages without direct connection to high-voltage conductors. Revenue-grade PTs must meet strict accuracy requirements; relay-grade PTs must maintain accuracy during fault conditions when voltage may be severely depressed.

📚

Topic Deck

Transmission Equipment

🔗

Source

FERC Pro Forma OATT / LGIP

Ready to test yourself?

Practice this term with interactive flashcards

▶  Open Flashcard Trainer

Related Terms in Transmission Equipment

Autotransformer

A transformer in which a single continuous winding serves as both the primary and...

Busbar (Bus)

A rigid, bare conductor — typically flat aluminum or copper bar, or tubular aluminum —...

Circuit Breaker

A switching device capable of making, carrying, and interrupting electrical currents...

Current Transformer (CT)

An instrument transformer that produces a secondary current precisely proportional to...

Disconnect Switch (Isolator)

A manually- or motor-operated switching device that provides visible air-gap...

FACTS (Flexible AC Transmission Systems)

A family of power-electronics-based devices and controllers that enhance the...
View all 20 terms in Transmission Equipment →