ABB 5SHY35L4512

Description

Product Description

The ABB 5SHY35L4512 is a member of ABB’s renowned SSHY thyristor family, designed for high-power, high-voltage applications. This specific model is a Press-Pack Thyristor, also known as a disk-type thyristor, which is engineered for robust performance in demanding electrical environments. The key characteristic of the ABB 5SHY35L4512 is its direct-pressure contact technology, which ensures excellent thermal cycling capability and high reliability. Unlike modules with baseplates, this design allows for double-sided cooling when pressed between heat sinks, significantly improving power handling and longevity.

Product Parameters

While exact parameters can vary, typical specifications for a component like the ABB 5SHY35L4512 include:

• Repetitive Peak Off-State Voltage (VDRM/VRRM): In the range of 5200V – 6500V.

• Average On-State Current (IT(AV)): Typically around 1200A – 1600A.

• Maximum Surge Current (ITSM): Very high, often in the tens of kiloamperes.

• Critical Rate of Rise of On-State Current (di/dt): High rating, e.g., 300 A/µs.

• Gate Trigger Current (IGT): Standard low-power gate drive requirement.

• Package: Press-Pack (hockey-puck) style, requiring external clamping force.

Advantages and Features

The design of the ABB 5SHY35L4512 offers several distinct advantages:

• Robust Construction: The press-pack design is inherently robust, with no internal solder or bond wires, making it highly resistant to thermal fatigue.

• Double-Side Cooling: Enables efficient heat dissipation, allowing for higher current densities and more compact converter design.

• Short-Circuit Ruggedness: Can withstand very high surge currents, a critical feature for grid and industrial applications.

• Failsafe Short-Circuit Mode: In case of catastrophic failure, the device typically fails into a short-circuit state, which is easier to handle in series strings than an open circuit.

• Long Service Life: Exceptional reliability under cyclic loading, which is paramount for HVDC transmission and large motor drives.

Application Cases in Industrial Fields

The ABB 5SHY35L4512 is deployed in high-power electronic convertors, including:

• HVDC Transmission Systems: Used as a key switching element in converter valves for efficient long-distance power transmission.

• Static VAR Compensators (SVCs): For dynamic reactive power compensation and voltage stabilization in electrical grids.

• Large HP Motor Soft Starters: To control the inrush current of massive induction motors in mining, pumping, and compressor stations.

• Industrial Heating and Electrolysis: In rectifier units for high-current DC supplies.

Comparison with Competing Products

Compared to alternative technologies like IGCTs or high-power IGBT modules, the press-pack ABB 5SHY35L4512 thyristor holds its ground:

• vs. IGCTs: Thyristors like the 5SHY35L4512 generally have higher voltage and surge current capabilities and are often preferred for the highest power utility applications. IGCTs offer direct gate-turn-off capability without the need for commutation circuits.

• vs. IGBT Modules: IGBT modules are dominant in frequency drives and inverters requiring high switching frequencies. The ABB 5SHY35L4512 excels in line-commutated, lower-frequency, ultra-high-power applications where utmost ruggedness and efficiency at low frequency are critical.

Selection Suggestions and Precautions

• Selection Advice:

  1. Always derate voltage and current parameters based on the application’s specific requirements and safety standards.

  2. Ensure the design includes a properly rated snubber circuit to limit voltage transients (dv/dt).

  3. The gate drive unit must be matched to the thyristor’s specifications for reliable turn-on.

  4. The mechanical assembly must provide the exact, uniform clamping force specified in the datasheet for the ABB 5SHY35L4512.

• Important Precautions:

  1. Professional Handling Required: These devices are sensitive to electrostatic discharge and mechanical damage. Follow ESD protocols.

  2. Thermal Interface: Use appropriate thermal grease and ensure heat sink surfaces are perfectly flat and smooth.

  3. Clamping Force: Incorrect clamping force is a leading cause of failure. Use a calibrated torque wrench on the clamping hardware.

  4. System Protection: The overall converter design must include coordinated protection (fuses, breakers, sensors) to handle fault conditions.

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