Description
1. Unboxing & Physical Snapshot
- Model & Brand: Woodward / SEG — WIP1 Self-Powered Time Overcurrent Relay (
WIP11I1E1). - Physical Dimensions: Approximately 96mm x 96mm x 115mm (standard panel-mount flush enclosure depth profile).
- Estimated Shipping Weight: 0.7 kg (compact industrial housing with high-density internal digital micro-controller boards).
- What’s in the Box: Protection relay unit, plug-in screw terminal blocks, transparent sealable front cover (IP40), mounting clips, and safety compliance paperwork.
2. Product Introduction
Environmental hook: Operating reliably inside remote medium-voltage switchgear installations where auxiliary control power is frequently unavailable, this self-powered overcurrent relay derives its operational energy directly from the main current transformers. The ruggedized Noryl enclosure protects internal microprocessor circuits against heavy substation electromagnetic interference and aggressive ambient moisture.
Mounting securely directly into switchboard door cutouts, this hardware coordinates primary feeder protection loops. System reliability engineers depend on its precise numerical curve processing to isolate distribution faults safely, which is critical for avoiding catastrophic transformer burnouts and plant-wide outages.
3. Core Technical Specifications
| Parameter | Value |
|---|---|
| Power Supply Type | Self-powered via main CTs (CT-powered mode from approx. 0.35 A phase current) |
| Current Transformer Inputs | Rated In=1 A or 5 A configurable inputs |
| Thermal Withstand | 250×In for 1 s; 100×In for 10 s; 4×In continuous |
| Tripping Characteristics | Definite time (DEFT) and Inverse time (NINV, VINV, EINV) curves |
| Output Contacts | Heavy-duty changeover trip relay contacts (max breaking capacity 1250 VA) |
| Enclosure Protection | IP40 on front fascia (with closed transparent cover), IP20 at rear terminals |
4. Global Compliance & Industry Certifications
- Regulatory Approvals: CE Mark, UL/cUL Recognized/Listed for industrial control equipment, and compliance with VDE 0435 / IEC 60255 standards.
- Safety Directives: Conforms to heavy industrial electromagnetic compatibility (EMC) directives covering electrostatic discharge and fast transient bursts.
- Compliance Significance: The IEC 60255 compliance guarantees that internal measuring circuits maintain high-precision timing accuracy during severe grid short-circuit events.
- Audit Note: Verify specific lot certifications with OEM documentation prior to final switchgear commissioning.
5. Long-Term Storage & Asset Preservation Guide
When storing self-powered protection relays in warehouse inventory, prioritize internal battery preservation and terminal protection. Because an internal lithium cell powers the fault-recording clock and local LCD display during unpowered states, inspect the battery voltage annually or disconnect it if storage exceeds three years to prevent destructive electrolyte leakage onto the logic board.
Keep the unit sealed inside an anti-static (ESD) shielding bag together with active silica gel desiccant packs. Maintain warehouse storage relative humidity below 60% to prevent micro-oxidation on the rear plug-in screw terminals and gold-plated communication pins.
6. Physical Installation Prerequisites
- Panel Cutout Accuracy: Machine the rectangular flush-mounting door cutout precisely to 92mm x 92mm dimensions to ensure the front gasket compresses uniformly for a secure fit.
- Wiring Termination: Connect external CT leads using copper conductors up to 2.5 mm2 cross-section, ensuring terminal screws are torqued securely to prevent high-resistance joint heating.
- Grounding Requirements: Fasten a dedicated ground wire from the rear housing earth screw directly to the switchgear assembly copper ground bus to suppress high-frequency transient surges.
7. Buyer’s FAQ (Logistics & Compliance Focus)
- Q: What Harmonized System (HS) Tariff Code governs global customs clearance for this protection relay?
- A: Typically classified under HS code 8536.49 (Electrical relays for a voltage exceeding 60V); verify precise schedules with your customs broker.
- Q: Does this relay require an external auxiliary power supply to trip the breaker?
- A: No; it extracts energy directly from line current transformers (self-powered design), though auxiliary supply variants exist for extended communication features.
- Q: How does the Country of Origin (COO) documentation impact regional import tariffs?
- A: Manufactured primarily in Germany, the official COO document establishes eligibility for preferential regional trade agreements; request paperwork prior to freight dispatch.
- Q: What specialized transport insurance protects this electronic hardware asset?
- A: Secure comprehensive “All-Risk” logistics insurance with shock-watch indicator labels affixed to the exterior shipping carton to monitor handling drops.
- A: Secure comprehensive “All-Risk” logistics insurance with shock-watch indicator labels affixed to the exterior shipping carton to monitor handling drops.
