Description

The 5SGX2645L0001​ is an ABB high-power thyristor module from the 5S semiconductor family, built in a flat-plate press-pack (PK) housing and rated at 6500 V_DRM / 2600 A_T(AV) with a 45 kA surge capability. As a press-pack device it contains no internal solder joints or bond wires — the wafer is clamped between two ceramic-isolated copper electrodes, making it the default choice for series-stacked rectifiers in HVDC valves, SVC (static VAR compensator) thyristor levels, electrolytic smelting rectifiers, and medium-voltage drive DC links where “decades without opening” is the design brief.h2 Application ScenariosIn a Nordic aluminium-smelter potline running 180 kA per pot through two 12-pulse rectifier transformers, the original thyristor stack (welded-module topology from a 1990s supplier) began showing bond-wire heel cracks after 18 years — one phase flashed over during a tap-change transient, taking out a 10 MVA transformer secondary. The refurb scope switched the entire stack to ABB 5SGX2645L0001​ press-pack devices: 6500 V rating gave comfortable margin over the 4.16 kV AC secondary (peak ≈ 5.9 kV including commutation overshoot), and the 2600 A continuous / 45 kA surge rating absorbed the potline’s routine current reversals without breathing hard. Because the press-pack has double-sided cooling (collector and anode both thermally active to the clamp plates), the stack’s thermal impedance stayed at 0.008 K/W per device even with the smelter’s ambient hovering at +48 °C near the DC bushall. Three years post-retrofit, the plant reported zero thyristor-led forced outages on that line — the previous welded modules had averaged one flashover every 26 months. For a potline where 1 hour of downtime = ~€40 k in lost metal, the 5SGX2645L0001​ upgrade paid back inside the first planned outage window.h2

Parameter

h2 Technical Principles and Innovative ValuesInnovation Point 1: Press-Pack Construction Eliminates Bond-Wire Fatigue. Traditional hockey-puck or module thyristors use internal Al bond wires from wafer to terminal; these cyclically fatigue under thermal swing and eventually open — the #1 wear-out mode in welded modules. The 5SGX2645L0001​ clamps the wafer between two molybdenum/ceramic-composite electrodes under a defined clamping force (specified per stack drawing), so there is literally no internal interconnect to fail. The device either conducts or it shorts “fail-safe” (press-pack thyristors tend to fail short-circuit rather than open, keeping the string diagnosable).Innovation Point 2: Double-Sided Cooling with 0.008 K/W R_th(j-c). Both the anode and cathode plates of the 5SGX2645L0001​ are thermally active — heat flows out both faces into the clamp/heat-sink stack. This halves the effective thermal resistance vs. a single-sided module of comparable current, letting 2600 A flow in a 4.5 kg package. In water-cooled HVDC valve towers, this density is what lets a 400 kV valve hall fit 100+ levels per pole.Innovation Point 3: 45 kA Surge + 6500 V Blocking = Margin for Utility Transients. Smelter rectifiers, mine winder DC drives, and MV drive DC links all see occasional commutation notches and capacitor-bank switching spikes. The 5SGX2645L0001​ holds 6500 V blocking (≈ 1.6× the 4.16 kV AC system peak) and absorbs 45 kA for 10 ms without wafer filamenting — buying the upstream breaker or fuse the clearance time it needs. That “absorb-and-survive” behavior is why EPCs standardize this P/N on potline and HVDC valve projects.