3AP1 DTC-145
Compact switchgear 3AP1 DTC, 145 kV, 40 kA, hybrid dead-tank module, stored-energy spring drive
3AP1 DTC-145
- Hybrid concept: dead-tank 3AP circuit breaker combined with the SF6-insulated disconnector / earthing switch of the GIS type 8DN9 and the Ruhrtal-design outdoor earthing switch in one module
- Approximately 40 percent substation space reduction compared with a conventional 145 kV AIS H-layout using five discrete dead tanks
- Modular per-bay configuration: current transformer, inductive voltage transformer, cable connection assembly, high-speed earthing switch and Voltage Detection System (VDS) as options
- Separated gas compartments between circuit breaker and disconnector increase availability; gas-insulated components are about four times more reliable than air-insulated ones (CIGRE)
- Proven 3AP self-compression interrupter and stored-energy spring drive; one- or three-pole operation; more than 1,200 DTC delivered to over 30 countries
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3AP1 DTC-145 covers up to 145 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | Siemens Energy 3AP1 DTC (Dead Tank Compact) high-voltage compact switchgear, available for 145 kV and 245 kV |
| Design | Hybrid module: SF6-insulated dead-tank circuit breaker fitted with GIS-derived components; encapsulation level and module layout adjustable per substation |
| Interrupter | One self-compression arc-quenching interrupter unit per pole, adopted from the AIS 3AP circuit-breaker family |
| Operating mechanism | Stored-energy spring drive mechanism; circuit breaker available in one- or three-pole operation design |
| Disconnector / earthing switch | SF6-insulated three-position disconnector / earthing switch based on GIS type 8DN9 components, mechanically interlocked; motor drive from the GIS product range |
| Optional components | Current transformer (conventional ring-type cores), inductive voltage transformer with own monitored gas compartment, cable connection assembly (IEC terminals), high-speed earthing switch, Voltage Detection System (VDS), SIVIS camera systems |
| Bushings | SF6-insulated bushings with porcelain or composite insulators; variants with outdoor earthing switches use porcelain bushings |
| Application | Compact 145 kV substation bays; approx. 40 percent space reduction versus a conventional AIS H-layout with discrete dead tanks |
Electrical
| Rated voltage | 145 kV |
| Rated frequency | 50 or 60 Hz |
| Rated normal current | up to 3,150 A |
| Rated short-circuit breaking current | up to 40 kA |
| Rated short-time withstand current (1 s – 3 s) | up to 40 kA (rms) |
| Rated lightning impulse withstand voltage | 650 kV |
| Rated short-duration power-frequency withstand voltage | 275 kV |
| Number of interrupter units per pole | 1 |
Mechanical / environment
| Rated break time | 3 cycles |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO |
| Temperature range | −55 °C up to +55 °C |
| Maintenance interval | First maintenance after 25 years |
| Gas compartments | Separation of gas compartments (e.g. between circuit breaker and disconnector); additional separation with SF6 density monitor on request; voltage-transformer compartment monitored by its own density monitor |
| Position monitoring | Position indicator at the disconnector / earthing switch operating mechanism; optional inspection windows and SIVIS stationary (up to 18 cameras) or mobile camera systems |
| Safety features | Mechanically interlocked three-position disconnector / earthing switch; rupture discs and filter attachments; manual emergency operation of each operating mechanism |
Standards & certifications
| Ratings basis | All published values in accordance with IEC; other values on request |
| Cable terminals | SF6-insulated cable connection assemblies delivered with cable terminals according to IEC |
| Reliability basis | Gas-insulated components rated approximately four times more reliable than air-insulated components according to CIGRE analyses; more than 1,200 DTC delivered to over 30 countries |
Options & variants
The two DTC types from the technical-data table of the 3AP1 DTC brochure (2023), which covers both rated voltages; shared values across both types: 1 interrupter unit per pole, −55 °C to +55 °C, 3-cycle break time, 50/60 Hz, maintenance after 25 years. This catalog entry describes the 145 kV type; the 245 kV type has its own entry.
| Type | Rated voltage | Breaking current | Rated normal current | Lightning impulse withstand | Power-frequency withstand |
|---|---|---|---|---|---|
| 3AP1 DTC 145 kV (this entry) | 145 kV | up to 40 kA | up to 3,150 A | 650 kV | 275 kV |
| 3AP1 DTC 245 kV | 245 kV | up to 63 kA | up to 4,000 A | 1,050 kV | 460 kV |
Documents & downloads
Brochure High-voltage compact switchgear 3AP1 DTC for 145 kV and 245 kV (Siemens Energy, 2023)
Catalog High-Voltage Circuit Breakers from 72.5 kV up to 1,100 kV (Siemens Energy, 2022)
Also covered in the technical library
Brochure 3AP1 DTC High-Voltage Compact Switchgear for 145 kV and 245 kV
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 ↓
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