Medium voltage Crowbar SCR Stack
The medium voltage module Crowbar Stack it's a machine that collects a series of tasks necessary for the operation of medium voltage SD drives.
The module Crowbar SCR Stack is divided into the sections listed below:
- Crowbar section / Chopper section (depending on the version)
- Supply section
- Precharge section
There are different Crowbar SCR Stack topologies depending on:
- Precharge type
- Number of power supply units
- Discharge resistance assembly
The Crowbar components are the following:
- Control card for thyristor activation (UNDEX_MT)
- Semiconductor stack, consisting of two thyristors and two diodes
- Discharge resistors (only for AXR2 version)
- Limiting reactors di/dt
- Current transducers
- Power transformer
- Crowbar section/chopper section (depending on the version)
- Supply section
- Precharge section
Technical data
| Ambient condition | |
|---|---|
| Altitude | 1000 m. a.s.l. | Min./Max. operating temperature | 0 ÷ 40°C | Storage temperature | 0 ÷ 40°C | Relative humidity | 10 ÷ 90% | Dimensions and weight | Height | 1740 mm | Width | 400 mm | Depth | 760 mm | Weight | 210 kg |
| Electrical data | |
|---|---|
| Rated DC bus voltage | 4800 Vdc (2400+2400) | Crowbar self-activation threshold | 6000 Vdc (3000+3000) | Current discharge peak | 1000 A | Thyristor activation | External command |
