8273-140 Woodward overspeed protector

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Product basic information
Manufacturer: Woodward
Model: 8273-140
Belonging to the famous 505 series
Supports multiple communication protocols and can be smoothly integrated with the existing control system of the factory
Core application: Designed specifically for speed control and protection of steam turbines
8273-140 controller has stable performance and high reliability

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8273-140 Woodward overspeed protector

The 8273-140 is a microprocessor-based digital governor controller produced by Woodward, belonging to its classic 505 series.
It is primarily designed for speed control and protection of steam turbines. Below is a detailed introduction to this product:

I. Product Overview

Brand and Model: Woodward 8273-140
Series: 505 Series Digital Governor
Type: Microprocessor-based controller
Purpose: Specifically designed for steam turbines to control their speed and provide overspeed protection.

II. Core Functions

Speed Control:
- 8273-140 Precisely controls the speed of steam turbines by adjusting steam inlet flow.
- Supports single-range or split-range actuators to accommodate turbines of different sizes.
Overspeed Protection:
- Incorporates triple independent overspeed protection logic to ensure rapid shutdown in case of overspeed, preventing equipment damage.
- Provides an overspeed test button for convenient on-site testing of protection functions.
Emergency Shutdown:
- Equipped with an emergency stop button for immediate shutdown in emergency situations.
System Protection:
- - Automatically switches control modes upon sensor failure to ensure uninterrupted system operation.
  - Offers local/remote control priority selection to adapt to different operational scenarios.

key parameters
Driving voltage: The gate voltage of MOSFETs and IGBTs is usually between 10V and 15V, but the output voltage of the gate

driver should be greater than this range to ensure reliable conduction and cutoff of the device. The output voltage range

of gate drivers is usually determined based on specific applications and device requirements.
Drive current: In order to charge and discharge the gate capacitance of MOSFETs and IGBTs, the gate driver needs to

provide sufficient current. These current values typically range from a few hundred milliamps to a few amperes, depending on

the size of the device”s gate capacitance and switching speed requirements.
Drive speed: The gate voltage of MOSFETs and IGBTs changes rapidly, so the gate driver must be able to quickly charge and

discharge the gates of these devices. The speed of driving directly affects the switching speed and efficiency of the device.
Anti interference capability: In the application environment of power electronics, there are various electromagnetic interferences

and noises. The gate driver must have a certain anti-interference ability to ensure the reliability and stability of the signal.
Main components
The gate driver mainly consists of the following parts:

Power supply: usually composed of a DC/DC converter and a capacitor. DC/DC converters convert input voltage into output voltage

suitable for gate drivers (typically between 15V and 30V), while capacitors are used to store charge for fast charging and discharging

of MOSFET and IGBT gates when needed.
Amplifier: The core component of a gate driver that converts input signals into drive signals suitable for MOSFET and IGBT gates.

An amplifier typically consists of transistors, operational amplifiers, and inverters/non inverters, used to amplify input signals and

control the current of transistors.
Protection circuit: used to protect MOSFETs and IGBTs from damage. Protection circuits typically include functions such as undervoltage

protection, overvoltage protection, overcurrent protection, and transient voltage protection to prevent device damage caused by abnormal

power supply voltage or excessive output current.
Output circuit: Convert the output current of the amplifier into driving signals suitable for MOSFETs and IGBTs. The output circuit typically

consists of a driving transformer and an output capacitor, used to convert the driving signal into a voltage suitable for the gate and store charge.

III. Technical Specifications

Power Supply: 18-32 VDC, supporting 24VDC input.
Display: Two-line x 24-character LED display for clear indication of operating status and parameters.
Enclosure: NEMA 4X or IEC 60529 IP56 rated for protection against harsh industrial environments.
Inputs/Outputs:
- Inputs: 6 programmable current inputs, 16 discrete contact inputs.
- Outputs: 2 actuator outputs, 8 relay outputs, 6 programmable current outputs.
Communication Interfaces: 8273-140 Supports RS-232, RS-422, and RS-485 hardware interfaces for easy integration with host computers or other devices.
Software: Equipped with OpView™ and 505View software for parameter configuration, monitoring, and fault diagnosis.
Operating Temperature: -20 to +60°C (some models support -4 to +140°F).
Storage Temperature: -40 to +85°C (some models support -40 to +185°F).
8273-140 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8273-140Suitable for steam turbines of various sizes, including industrial steam turbines, small grid turbo-generators, and turboexpanders.
Single Extraction and Admission Applications: Designed for operating steam turbines in single extraction and/or admission applications.
On-Site Programming: Allows on-site operators to program and adjust parameters through an integrated operator control panel, adapting to different operating conditions.

V. Product Advantages

High Reliability:
- Microprocessor-based design ensures precise control and stability.
- Triple independent overspeed protection logic provides multiple layers of safety.
Flexibility:
- Supports various actuator and sensor configurations to accommodate different turbine models.
- Offers a rich set of input/output interfaces for easy system expansion and integration.
Ease of Use:
- Two-line x 24-character LED display provides an intuitive operating interface.
- A 30-key multifunctional keyboard simplifies parameter configuration and operation.
Compatibility:
- Supports multiple communication protocols for easy integration with DCS, PLC, and other systems.
- Provides OpView™ and 505View software for remote monitoring and fault diagnosis.