8444-1074 Woodward overspeed protector

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Product basic information
Manufacturer: Woodward
Model: 8444-1074
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
8444-1074 controller has stable performance and high reliability

Categories: WOODWARD
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8444-1074 Woodward overspeed protector

The 8444-1074 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 8444-1074
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:
- 8444-1074 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.

The function of voltage controller

The function of voltage controller
The function of the controller is to provide a leading phase at an appropriate frequency to offset (or compensate for) the

excess lagging phase of the main electrical device; On the contrary, when there is excess lead phase in the main circuit,

a lag phase should be provided at an appropriate frequency to offset (or compensate); And make the open-loop frequency

response of the system cross the 0 dB line at higher frequencies, which can obtain a wider frequency band and accelerate the

system”s response. As shown in the figure, the open-loop frequency characteristic To (ω) of the desired switching power supply

system after compensation is in the low frequency range.

To characterize the steady-state characteristics of the system, a high DC gain is desired. The intermediate frequency band characteristics

near the gain crossover frequency characterize the relative stability of the system. If the design results make the intermediate frequency

band of the frequency characteristics have the properties of a first-order lag system (-1 slope decrease, 90 ° phase lag), the system stability

can be guaranteed. Using the gain crossover frequency ω c to approximate the bandwidth, the higher ω c, the faster the system response.

The complexity of the high-frequency representation system is characterized by many high-frequency noises, so it is hoped that the gain

of the high-frequency band can be reduced as soon as possible to reduce the noise.

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: 8444-1074 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).
8444-1074 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8444-1074Suitable 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.