Description
1. Unboxing & Physical Snapshot
- Model & Brand: ABB (SPACOM Protection and Control Family) — Combined Restricted Earth-Fault and Residual Earth-Fault Relay, Part Number SPAJ115C.
- Physical Dimensions: Standard ABB 100-series modular relay case profile (approx. 170 mm x 137 mm x 225 mm flush mounting depth).
- Estimated Shipping Weight: 3.00 kg (Including robust multi-layer anti-static packaging, heavy-duty logistics carton, and terminal plug blocks).
- What’s in the Box: SPAJ115C relay assembly featuring the integrated SPCJ 2C30 relay module, local numerical display, configuration pushbuttons, rear heavy-duty plug-in current/voltage terminal blocks, fiber-optic serial communication port, and factory conformity documentation.
2. Product Introduction
Engineered specifically for medium-voltage power distribution systems, this numerical protection relay provides high-speed, selective earth-fault protection for power generators, large motors, and transformer windings.
Fitted into switchgear relay compartments, the hardware utilizes two distinct measurement input circuits: a high-sensitivity differential current circuit (\Delta I_0) for restricted earth-fault (REF / ANSI 87N) protection, and a residual current circuit (I_0) for backup earth-fault (ANSI 51N) protection. (Electrical protection engineers rely on this classic SPACOM platform to secure critical winding zones against internal ground faults with high immunity to external disturbances.)
3. Core Technical Specifications
| Parameter | Value |
| Product Family | ABB SPACOM Modular Protection Relay Series |
| Primary Protection Function | Sensitive Restricted Earth-Fault (REF / ANSI 87N) |
| Backup Protection Function | Residual / Neutral Earth-Fault (ANSI 51N, Definite/IDMT) |
| Rated Input Current (I_n) | Dual-rated 1 A / 5 A field selectable via terminal configuration |
| Auxiliary Power Supply | Wide-range universal supply (80–265 VAC / VDC or 18–80 VDC variants) |
| Communication Interface | Rear-panel serial bus interface via fibre-optic link |
| Operating Temperature | -10°C to +55°C (+14°F to +131°F) environmental limit |
| Enclosure Protection | IP54 front panel rating when flush-mounted |
4. Global Compliance & Industry Certifications
Substation automation auditors and electrical grid regulatory boards demand strict documentation and testing verification for numerical protection assets.
- Expected Certifications: CE Mark, IEC 60255 international standards for measuring relays, and relevant electromagnetic compatibility (EMC) directives.
- Safety Relevance: Rigorous hardware self-supervision, continuous auto-diagnostics, and optical interface isolation prevent internal logic locking or false tripping during high-voltage switching surges.
- Audit Directive: Verify specific order codes and firmware revisions. Ensure the complete catalog configuration matches plant protection coordination studies and single-line protection setting dossiers.
5. Long-Term Storage & Asset Preservation Guide
Legacy numeric protection relays kept in warehouse reserve stock degrade prematurely if environmental and electrical baselines are neglected.
- ESD Protection Integrity: Keep the plug-in relay module and case assembly sealed inside anti-static shielding packaging to protect sensitive internal microprocessors from electrostatic discharge.
- Climate Management: Maintain warehouse storage relative humidity strictly below 60% non-condensing to prevent micro-oxidation on rear terminal pins and internal connector tracks.
- Module Seating Inspection: Inspect the internal module locking latches and edge connectors periodically to ensure secure mechanical retention during long-term storage.
6. Physical Installation Prerequisites
Proper panel cutout mounting and careful wiring discipline are mandatory to maintain restricted earth-fault stability and measurement accuracy.
- CT Stability Prerequisite: Restricted earth-fault (87N) protection relies heavily on matched CT characteristics. Verify that external stabilizing resistors and current transformer knee-point voltages comply strictly with ABB application guidelines.
- Current Circuit Safety: Never open-circuit active current transformer secondary loops. Ensure CT shorting blocks are engaged before extracting the relay module from its housing case.
- Fibre-Optic Handling: Terminate and route serial bus fibre-optic cables carefully, avoiding tight bends or micro-fractures that cause communication attenuation with upper-level SCADA systems.
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: What Harmonized System (HS) Tariff Code applies to global shipments of this protection relay?
A: Numerical protection relays and industrial control monitoring equipment typically clear under HS Code 8536.49 (Relays) or 8538.90 (Parts suitable for use with electrical control apparatus). Confirm precise classifications with your customs broker.
Q: Does importing this specialized substation IED require an authentic Certificate of Origin (COO)?
A: Yes. Securing a formal Certificate of Origin from your procurement partner verifies manufacturing traceability and satisfies quality assurance compliance mandates.
Q: Are these replacement relays shipped with pre-loaded protection settings?
A: Units are supplied with factory default configurations. Protection engineering teams must program the exact pickup thresholds, time-dial characteristics, and CT ratios using the front-panel interface or SPA configuration software prior to energizing the primary asset.
