Application Scenarios
In a large aluminum smelter, a bank of rectifiers provides the massive DC current required for the electrolytic reduction process. The facility relies on 5STP series thyristors in each phase leg of its 12-pulse rectifier system. A rectifier arm failure caused by an aging thyristor with increased forward voltage drop threatened to derate the entire potline, risking a costly production cut. The maintenance team replaced the suspect unit with a ABB 5STP26N6500. The new thyristor’s matched Qrr and VT values ensured balanced current sharing with the parallel devices, and its low on-state voltage drop minimized additional power losses, restoring the rectifier to full capacity.
The ABB 5STP26N6500 is also a critical component in large variable-speed drive systems. In a high-power medium-voltage drive (such as the ABB ACS6000), these thyristors can be found in the front-end rectifier section, converting AC line power to DC before the inverter stage. Its press-pack design and robust construction offer exceptional reliability and thermal cycling capability, providing a long service life.
Technical Specifications
| Main Parameters | Value / Description |
|---|---|
| Product Model | 5STP26N6500 |
| Manufacturer | ABB Switzerland / Hitachi Energy |
| Product Category | Phase Control Thyristor (SCR) |
| VDRM / VRRM (Repetitive Blocking Voltage) | 6500 V |
| IT(AV) (Average On-State Current) | 2880 A @ 70°C case temperature |
| IT(RMS) (RMS On-State Current) | ~2600 A to 4520 A |
| ITSM (Surge On-State Current) | 65 kA (10ms half sine wave) |
| Gate Trigger Current (Igt) | 400 mA (typical) |
| Package / Mounting | Hockey-Puk / Press-Pack (double-sided cooling) |
| Body Dimensions (Diam. x H) | Ø150 mm / Ø100 mm x 35 mm |
| Clamping Force | 90 kN ±10% |
| Weight | Approx. 2.90 kg |
| Key Feature | Phase control (PCT), optimized for low on-state voltage drop |
Explanation of key parameters:
- VDRM / VRRM of 6500V means this device can reliably block up to 6.5kV in both forward and reverse directions, a crucial safety margin for high-voltage power converters.
- IT(AV) of 2880A @ 70°C defines the maximum continuous direct current the thyristor can carry when the case is kept at 70°C, typically with liquid cooling.
- Press-pack package enables both anode and cathode to be clamped to external heatsinks, providing exceptional heat dissipation and a failsafe “short-circuit” mode in the event of device failure.
- Clamping force of 90 kN is a critical installation parameter – proper force ensures minimal thermal resistance and reliable electrical contact.
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