745-W2-WP5-G5-HI | GE Multilin Transformer Management and Protection Relay

Product Description

The 745-W2-WP5-G5-HI Transformer Management Relay from GE Multilin is part of the 745 Series, designed for comprehensive transformer protection and monitoring. This relay is a high‑speed, multi‑processor device capable of managing two‑winding or three‑winding transformers, ensuring reliable operation across small, medium, and large power transformer applications.

Technical Specifications

• Manufacturer: GE Multilin

• Series: 745 Transformer Protection System

• Product Type: Transformer Management Relay

• Model Number: 745-W2-WP5-G5-HI

• Transformer Compatibility: Two‑winding or three‑winding transformers

• Frequency: 50 or 60 Hz nominal

• Frequency Tracking:

• 40–65 Hz for 0.05 × CT < current ≤ 1 × CT

• 5–65 Hz for current > 1 × CT

• 2–65 Hz for voltage > 50% VT (if voltage sensing enabled)

• Control Power Options: LO / HI (specified at order)

• LO Range: 20–60 VDC; 20–48 VAC at 48–62 Hz

• HI Range: 90–300 VDC; 70–265 VAC at 48–62 Hz

• Power Consumption: 30 VA nominal, 40 VA maximum

• Ride‑through Time: 16.7 ms at 0% control power

• Fuse Rating: 3.15 A, Littelfuse 2153.15 (slow‑blow, high breaking capacity, 5 × 20 mm)

• Phase Current Input:

• <4 × CT: ±0.25% of 4 × CT (±0.01 × CT)

• ≥4 × CT: ±0.59% of 46 × CT (±0.2 × CT)

• CT Primary: 1–50,000 A

• CT Secondary: 1 A or 5 A (specified at order)

• Relay Input: 1 A or 5 A

• Burden: <0.2 VA per phase at rated load

• Conversion Range: 0.02–46 × CT at 50/60 Hz

• Accuracy:

Application Scenarios

This relay is widely used in:

• Primary transformer protection for utility and industrial power systems

• Adaptive monitoring where frequency tracking and harmonic restraint are critical

• High‑reliability installations requiring configurable control power ranges

FAQ

Q: What transformer configurations are supported?  A: The relay supports both two‑winding and three‑winding transformer systems.

Q: Can the relay operate under varying frequency conditions?  A: Yes, it includes adaptive frequency tracking from 2 Hz up to 65 Hz depending on current and voltage conditions.

Q: What are the available control power ranges?  A: LO range (20–60 VDC / 20–48 VAC) and HI range (90–300 VDC / 70–265 VAC).

Q: How does this model differ from other 745 relays?  A: The 745-W2-WP5-G5-HI offers expanded frequency tracking and configurable CT input ranges compared to base models.