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Description
Application Scenarios
During the annual maintenance shutdown of a 33kV gas-insulated switchgear (GIS) bay in a utility substation, the protection team must test the REF615 feeder protection relay. A direct disconnection of the CT secondary wires to inject test current would be extremely dangerous—it could create an open-circuit condition, inducing lethal high voltages and damaging the CTs, all while the primary 33kV system is still energized on adjacent bays. The ABB RTXP 18 RK926015-BH Test Switch is permanently wired into this critical junction. The technician simply inserts a test plug, which automatically performs a sequenced operation: first, it short-circuits the CT secondary windings to protect them, then it disconnects the wires leading to the relay, and finally, it connects the test wires from the relay test set. This allows the technician to safely inject test currents and voltages to verify the relay’s trip accuracy and timing, with zero risk to personnel or equipment. The RTXP 18 is the indispensable safety device that makes live-system adjacent maintenance and reliable relay validation possible.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | ABB RTXP 18 (Order Code: RK926015-BH) |
| Manufacturer | ABB (Asea Brown Boveri) |
| Product Category | Test Switch / Test Block / Secondary Test Isolation Device |
| Primary Function | Safe isolation, short-circuiting, and test access for protection circuit secondary wiring |
| Rated Insulation Voltage | 1000V AC [Defines voltage withstand capability between terminals] |
| Rated Current (Continuous) | 20A (typical) [For carrying normal CT/VT secondary current] |
| Short-Time Withstand Current | 100A for 3 seconds (typical) [For fault current withstand during system faults] |
| Number of Poles/Circuits | 18 poles (configurable for 3 x 3-phase CT circuits, or mix of CT & VT) [Defines circuit handling capacity] |
| Switching Sequence | Make-Before-Break (MBB) for shorts, Break-Before-Make (BBM) for isolation [Ensures CTs are never open-circuited] |
| Contact Material | High-quality silver-plated copper alloy [For low contact resistance and high conductivity] |
| Housing Material | Flame-retardant thermoplastic (e.g., Polyamide) [For safety and durability] |
| Mounting | Standard DIN rail mount (35mm) or panel mount |
| Connection Type | Screw clamp terminals for conductor cross-section up to 4mm² |
| Accessory | Uses a dedicated test plug with shrouded, color-coded 4mm safety test sockets |
| Compatible Systems | ABB Relion protection relays, and standard protection panels for utility/industry substations. |
