Description
Manufacturer: Woodward SEG
Part Number: WIP1-3-I1-E1
Product Type: CT-Powered Digital Time Overcurrent & Earth Fault Protection Relay (WIP1 Series, WIP1-3 variant)
Product Overview
The WIP1-3-I1-E1 is a self-powered numerical protective relay designed for phase overcurrent and earth fault protection. It can draw operating energy from 1A current transformers, and the WIP1-3 version adds dual power input plus RS485 communication interface. It is widely deployed in medium voltage switchgear, generators and distribution feeders, providing ANSI 50/51 protection for power systems where reliable operation without station auxiliary power is required.
Technical Specifications
| Parameter | Value |
|---|---|
| CT Input Rating | 1 A secondary |
| Protection Functions | Phase time overcurrent, instantaneous high-set overcurrent, two-stage earth fault protection (ANSI 50,51,51N) |
| Communication | RS485, support Woodward Open Data Protocol or Modbus |
| Power Supply | Primary CT self-power; WIP1-3 supports dual power: CT power + optional external auxiliary supply |
| Trip Curves | Selectable IEC inverse / definite time characteristics |
| Mounting | Panel mount |
| Operating Temperature | -20 °C ~ +60 °C |
| Country of Origin | Germany |
Key Features
- Dual power architecture: normally powered from CT current; external auxiliary supply backup keeps relay active under low primary load conditions.
- Combined 3-phase overcurrent plus two-stage residual earth fault protection in one compact unit.
- Multiple selectable trip curves, fully adjustable pickup thresholds and time delay settings.
- Built-in RS485 serial port for remote configuration, real-time data monitoring and fault event recording for SCADA integration.
- Digital DFT signal filtering to suppress DC offset and harmonic transients during short-circuit faults.
- Robust hardware construction for power plant and substation environments, long service life with low maintenance requirement.
Application Scenarios
- Generator protection in islanded or grid-connected power stations
- Medium voltage distribution feeders
- Large HV motor protection
- Remote substations with unreliable or unavailable auxiliary AC/DC supply
Installation & Maintenance Notes
- The relay must be connected to 1A rated current transformers only.
- Verify CT polarity and wiring before energization; wrong polarity can cause protection misoperation.
- The external auxiliary supply is optional, used for continuous monitoring when load current is too low to power the relay via CT.
- Retrieve fault logs over RS485 for post-fault analysis and trip event review.
- Check terminal tightness and insulation condition during regular outage maintenance.
- Perform protection characteristic test during commissioning and periodic calibration.
FAQ
Q: What is the difference between WIP11I1E1 and WIP1-3-I1-E1? A: WIP11I1E1 is basic CT self-powered version; WIP1-3-I1-E1 is the upgraded WIP1-3 variant with dual power backup and RS485 communication port for SCADA.
Q: Can the relay work without external auxiliary power? A: Yes. It can run purely on CT energy. The external supply is only an optional backup for low-load conditions.
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