Description
The ABB RTXP 24 (Part Number: RK 926 315-AG) is a 24-pole test switch module belonging to ABB’s COMBITEST / COMBIFLEX system. It is engineered for safe, fast, and reliable secondary injection testing of protection relays, IEDs, and substation automation systems without needing to physically disconnect field wiring or instrument transformer secondary circuits.
- Brand: ABB / ASEA
- Model: RTXP 24
- Series: COMBITEST / COMBIFLEX Test System
- Product Name: 24-Pole Relay Test Switch / Test Block
- Part Number / Ordering Code: RK 926 315-AG
- Country of Origin: Sweden / Germany
- Manufacturing Status: Active Industrial Production / Standard Substation Component
- Enclosure / Mounting Format: Occupies 3U of rack height and 12 TE of width on a standard COMBIFLEX frame (dual-housing layout with 12 contact units per side)
- Weight: Approx. 2.5 – 2.9 kg
- Electrical Ratings: Up to 600V DC / 500V AC; test contacts rated for continuous current / 20 A circuit handling
🚀 First-Run Inspection Checklist
- 📦 Packaging Verification: Inspect the shipping carton and protective lining to ensure zero physical impact or transit damage.
- 🏷️ Nameplate Confirmation: Verify that the part number string
RK 926 315-AGprecisely matches your substation design schedules and wiring blueprints. - 🔍 Visual Examination: Inspect the dual transparent front covers, internal contact blocks, and rear terminal connection points for dust, debris, or mechanical wear.
- 🔩 Mounting Security: Ensure the test switch is securely fastened into its rack, panel cutout, or RHGS/RHGX enclosure case before connecting heavy control cabling.
🛠️ Routine Maintenance
- 🧹 Dust Management: Periodically clear dust accumulation from the front covers and rear terminal blocks using dry, oil-free compressed air.
- 🔌 Terminal Tightening: Check all rear 20 A COMBIFLEX screw terminals periodically to counteract any vibration-induced loosening from surrounding switchgear operations.
- 🌡️ Environmental Audit: Ensure that the control or relay room temperature remains within acceptable industrial operating thresholds.
- 🔄 Functional Verification: Inspect internal short-circuiting springs and test-handle interface alignment during scheduled major maintenance intervals.
🔍 Troubleshooting & Common Issues
- ❓ Test Plug Fails to Engage Properly: Check for physical obstructions or misaligned pins inside the dual-housing slots before inserting the RTXH 24 test handle.
- ⚠️ Signaling Contact Failure: Verify wiring continuity on the top-mounted test-mode auxiliary change-over contact, which signals IED test states to supervisory systems.
- 📉 Intermittent Circuit Continuity: Inspect rear terminal wiring for oxidation, loose screws, or improper wire strip lengths.
⚠️ Safety Precautions
- ⚡ Isolation Awareness: While the test switch automatically short-circuits current transformers (CTs) and isolates trip paths sequentially via the test plug, always exercise caution around live auxiliary power circuits.
- 🧰 Qualified Personnel: Operation, testing, and wiring modifications must be performed exclusively by certified electrical testing and protection commissioning engineers.
- 🛡️ Proper Accessories: Always utilize matching ABB COMBITEST accessories (such as the RTXH 24 test-plug handle and approved banana-plug leads) to prevent arc flashes or equipment damage.
💡 Frequently Asked Questions (Q&A)
- Q: What is the primary function of the ABB RTXP 24 switch?
- A: It provides a secure, centralized interface to isolate, test, and inject signals into protection relays safely without rewiring or unbolting secondary transformer leads.
- Q: What makes the “-AG” variant unique?
- A: The suffix code (
-AG) designates the exact factory pre-arrangement and internal combination of current, voltage, trip, and auxiliary contact modules required for a specific customer application layout.
- A: The suffix code (
