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Warranty:1 year
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GE Multilin · 745 Transformer Protection System
Sales manager: Jim Pei
Wechat: ZXH18020776782
Email: sales1@apterpower.com
Phone/WhatsApp: +86 18020776782
| Windings per phase | 3 |
| Configured phase and ground CT rating | 5 A |
| High-range DC control supply | 90–300 VDC |
| High-range AC control supply | 70–265 VAC |
| Control supply frequency | 48–62 Hz |
| Control-power consumption | 30 VA nominal; 40 VA maximum |
| Phase/ground input conversion range | 0.02–46 x CT |
| CT input burden | Less than 0.2 VA at rated load |
| Current withstand, short duration | 80 x rated for 1 second; 40 x rated for 2 seconds |
| Continuous current withstand | 3 x rated current |
| Source CT primary setting | 1–50000 A |
| Configured analog inputs | 4 |
| Analog input signal selections | 0–1, 0–5, 0–10, 0–20 or 4–20 mA |
| Analog input impedance | 375 ohm ±10% |
| Analog input conversion range | 0–21 mA |
| Analog I/O accuracy | ±1% of full scale |
| Configured analog outputs | 7 |
| Analog output isolation | Fully isolated |
| Logic contact inputs | 16 |
| Wet-contact input limits | 30–300 VDC at 1.5 mA |
| Dry-contact ON resistance | 1000 ohm maximum |
| Voltage input | 60–120 V phase to neutral |
| Maximum continuous voltage input | 273 V phase to neutral |
| Voltage input burden | Less than 0.025 VA at 120 V |
| Source VT ratio | 1–5000:1, steps of 1 |
| Serial communication rate | 300–19200 baud |
| Serial protocols | Modbus RTU; DNP 3.0 Level 2 |
| Operating ambient | -20 to +60°C |
| Storage ambient | -40 to +90°C |
| Humidity | Up to 90% RH, non-condensing |
| Time-tagged event capacity | 128 events |
| Waveform capture capacity | 10 records, up to 32 power cycles |
| Harmonic metering | Through the 21st harmonic |
The GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H is configured for transformer protection with three windings per phase. Its phase and ground current inputs use a five-ampere rating, together with high-range control power. Analog interfaces, loss-of-life monitoring and restricted ground-fault protection are included in the specified option string. Percentage differential protection compares the transformer current paths while harmonic restraint helps secure operation during energization. The relay also supports transformer condition assessment and disturbance analysis. Match the winding arrangement and enabled protection settings to the transformer scheme before commissioning.
Dual-slope restraint compares winding-current conditions to distinguish internal-fault operation from restrained conditions.
Second-harmonic restraint and selectable fifth-harmonic inhibition reduce unwanted differential operation during inrush or overexcitation.
Power-transformer protection
Apply the configured winding arrangement to the matching transformer current-transformer circuits and differential scheme.
Autotransformer and reactor projects
The protection platform also supports suitable autotransformer and reactor applications subject to complete scheme engineering.
The A, L and R options identify analog I/O, loss-of-life and restricted-ground-fault functions. They must remain part of the complete configuration match.
Our team members have an average of more than 10 years of industry experience. We have worked with customers worldwide, including those from India, Germany, Sweden, Italy, Russia, Venezuela, Israel, and many other countries. Throughout our careers, we have collectively completed over 3,000 orders and established long-term business relationships with customers across nearly 30 countries.
We can often identify a product’s manufacturer, series, configuration, and function from its model number or nameplate photo. We also understand how revisions, firmware, and specifications affect compatibility and whether an alternative model can be used safely.
In Practice: An Indian customer urgently needed a discontinued control module after several suppliers reported no stock. We identified its exact revision and function from the nameplate, checked compatible alternatives, and contacted factory and warehouse channels to locate matching inventory. After installation, the customer confirmed that the module operated correctly and later asked us to source additional spare parts.
Our team treats every inquiry sincerely and answers every question patiently. Even for complex requests, we verify and respond to each detail instead of providing a rushed or uncertain answer.
In Practice: A German customer sent a mixed list of automation products and asked repeated questions about revisions, condition, photos, and delivery. Our team organized the requirements, checked every item, and replied point by point. The customer said our detailed communication made the purchasing decision easier and continued sending us new inquiries.
Sincere Cooperation, Long-Term Trust
India – An Indian customer still had doubts after initial online communication with us, so they visited our company in person for a face-to-face meeting and product inspection. This visit increased the customer's trust and led to the successful placement of their first order. Over the next few years, we completed multiple orders and established a stable, long-term partnership.
Malaysia – A Malaysia customer needed a specific automation component and compared products and services from several suppliers online. After nearly three weeks of careful consideration, our sincere communication, professional service, and reliable product quality won the customer's trust. After receiving the product and using it for several weeks without any problems, the customer gave us positive feedback and subsequently placed multiple orders.
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