3AP1 DTC-245
Dead Tank Compact hybrid switchgear 3AP1 DTC, 245 kV, up to 63 kA, single interrupter unit per pole, stored-energy spring drive
3AP1 DTC-245
- Hybrid concept: dead tank breaker with 3AP self-compression interrupter plus SF6-insulated three-position disconnector / earthing switch from the GIS type 8DN9 — approx. 40% substation space reduction vs. a conventional AIS H-layout (brochure example: 145 kV, five dead tanks)
- Up to 63 kA rated short-circuit breaking current and up to 4,000 A rated normal current at 245 kV with a single interrupter unit per pole; rated break time 3 cycles
- Gas-insulated components are four times more reliable than air-insulated per CIGRE analyses; separated gas compartments (e.g. between circuit breaker and disconnector) increase availability
- Modular options: ring-core CTs at AIS-equivalent positions, inductive VTs per pole, high-speed earthing switch, Voltage Detection System, SF6-insulated cable connections, double breaker modules, one- or three-pole operation
- Over 1,200 DTC circuit breakers delivered to more than 30 countries; maintenance after 25 years; temperature range down to -55 °C
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3AP1 DTC-245 covers up to 245 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 DTC 245 kV (Dead Tank Compact, high-voltage compact switchgear) |
| Design | Hybrid compact switchgear — dead tank circuit breaker fitted with disconnector, earthing switch and instrument-transformer modules per substation layout |
| Interrupter | Self-compression arc-quenching interrupter unit of the AIS 3AP circuit breaker family; 1 interrupter unit per pole |
| Operating mechanism | Stored-energy spring drive mechanism; one- or three-pole operation design |
| Disconnector / earthing switch | SF6-insulated three-position disconnector / earthing switch based on GIS type 8DN9, mechanically interlocked, GIS motor drive; outdoor earthing switch from the Ruhrtal-designed disconnector range; optional additional or high-speed earthing switch |
| Instrument transformers | Ring-core current transformers (measuring and protection cores, various positions); inductive voltage transformers per pole in separate gas compartment with additional density monitor; Voltage Detection System (VDS, up to three) as VT alternative |
| Connections | SF6-insulated bushings in porcelain or composite (epoxy-impregnated fiber glass tube with silicone rubber sheds); SF6-insulated cable connection assembly with IEC cable terminals as alternative; variants with outdoor earthing switches use porcelain bushings |
| Insulating / quenching medium | SF6 |
Electrical
| Rated voltage | 245 kV |
| Rated short-duration power-frequency withstand voltage | 460 kV |
| Rated lightning impulse withstand voltage | 1,050 kV |
| Rated normal current | up to 4,000 A |
| Rated short-circuit breaking current | up to 63 kA |
| Rated short-time withstand current (1 s - 3 s) | up to 63 kA (rms) |
| Number of interrupter units per pole | 1 |
| Rated break time | 3 cycles |
| Rated operating sequence | O-0.3s-CO-3min-CO or CO-15s-CO |
| Rated frequency | 50 or 60 Hz |
Mechanical / environment
| Temperature range | -55 up to +55 °C |
| Maintenance interval | Maintenance after 25 years; circuit breaker check after 12 years or 6,000 operating cycles, maintenance after 25 years or 10,000 cycles (ohmic-inductive loads) |
| Disconnector maintenance (DTC) | Check after 12 years or 5,000 operating cycles; maintenance after 25 years or 10,000 cycles |
| Earthing switch maintenance (DTC) | Check after 12 years or 1,000 operating cycles; maintenance after 25 years or 2,000 cycles |
| Space requirement | Approx. 40% space reduction vs. conventional AIS H-layout with five dead tanks (5 DTC switching modules) |
| Position monitoring | Position indicators at operating mechanisms; optional inspection windows; SIVIS stationary (up to 6 cameras per pole, 18 total) or mobile camera systems — mobile system adapter for 245 kV compact switchgear optional |
| Gas compartments | Separated gas compartments (e.g. between circuit breaker and disconnector); additional separation with SF6 density monitor on request |
| Installed base | More than 1,200 DTC circuit breakers delivered to over 30 countries |
Standards & certifications
| Ratings basis | All values in accordance with IEC; other values on request |
| Reliability | Gas-insulated components four times more reliable than air-insulated components according to CIGRE analyses |
| Cable terminals | Cable connection assemblies delivered with cable terminals according to IEC |
| Interlocking | Disconnector / earthing switch functions mechanically interlocked by three-position design; each operating mechanism manually operable in the event of a technical failure |
Options & variants
Both columns are from the technical data table in the 3AP1 DTC brochure (2023, p. 6); power-frequency withstand 460 kV (245 kV) / 275 kV (145 kV). Shared rows: 1 interrupter unit per pole, -55 to +55 °C, 3-cycle break time, 50/60 Hz, maintenance after 25 years. Drive variants of the disconnector / earthing switch module: disconnector only; disconnector-earthing switch; with additional earthing switch; with high-speed earthing switch.
| Variant | Rated voltage | Short-circuit breaking current | Rated normal current | Lightning impulse withstand |
|---|---|---|---|---|
| 3AP1 DTC 245 kV | 245 kV | up to 63 kA | up to 4,000 A | 1,050 kV |
| 3AP1 DTC 145 kV (sibling rating column) | 145 kV | up to 40 kA | up to 3,150 A | 650 kV |
Documents & downloads
Brochure High-voltage compact switchgear — 3AP1 DTC for 145 kV and 245 kV (2023)
Service flyer Maintenance of AIS 3AP DT and DTC — Preventive Maintenance (2022)
Catalog High-Voltage Circuit Breakers — From 72.5 kV up to 1100 kV (2022), 3AP1 DTC Dead Tank Compact section
Also covered in the technical library
Catalog High-Voltage Circuit Breakers from 72.5 kV up to 1100 kV — Siemens Energy brochure
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
Related products
3AP1 DT-145 Circuit breaker 3AP1, 145 kV, 40 kA, stored-energy spring drive
145 kV rated voltage · 40 kA breaking / up to 3,150 A · SF6 self-compression interrupter, spring drive Datasheet · Dimensions ↓
3AP1 DT-245