GE SR745‑W2‑P5‑G5‑HI‑A Transformer Management Relay

Technical Specifications Module Type: Multifunction Transformer Management Protection Relay Applicable System: Power‑Plant Auxiliary‑Transformer and Industrial Distribution‑Transformer Protection System Measurement Input: Transformer‑side CT current‑transformer and PT potential‑transformer inputs Protection Functions: Transformer differential protection, over‑current, thermal overload, over‑voltage, under‑voltage protection Communication Interface: Multichannel serial communication ports for upper‑monitoring‑system interconnection Power Supply: Auxiliary AC/DC operating power supply Operating Temperature: -20 °C to +65 °C Storage Temperature: -40 °C to +85 °C Relative Humidity: 5%-95%, non‑condensing Mechanical Dimension: Standard cabinet‑panel‑mount relay housing Certifications: CE, UL power‑transformer‑protection‑relay compliance

Functional Features Implements transformer main‑protection differential protection and backup‑protection multi‑group over‑current protection. Provides thermal‑overload, over‑voltage and under‑voltage monitoring and protection for transformer equipment. Real‑time measurement of transformer‑side voltage and current electrical operating‑parameters.

Application Scenarios Mainly used for auxiliary transformer protection inside thermal power plants, substation distribution transformers, industrial factory power distribution transformers. It is suitable for power system occasions requiring transformer differential protection, electrical parameter monitoring and fault event recording.

Structural Characteristics Adopts standard panel‑mount metal housing suitable for power cabinet front‑panel installation. Equipped with local LCD display panel and physical operation keys for on‑site parameter checking and setting. Rear terminal block realizes CT, PT signal access, power input and relay contact signal wiring. Internal integrated high‑precision sampling circuit and data processing unit.

Working Principle CT and PT send transformer real‑time current and voltage signals into the relay internal sampling circuit. The internal processing unit calculates electrical parameters and compares sampled value with preset protection threshold. When electrical quantity exceeds protection setting value, the relay will drive output contact to complete trip or alarm action.

Installation Requirements Install the relay on the front panel of standard power control cabinet according to panel cut‑out dimension. Complete CT, PT secondary circuit wiring, auxiliary power wiring and trip‑alarm loop wiring on rear terminals strictly follow official wiring drawing.