Overspeed Monitoring - HEINZMANN UK

HEINZMANN UK

Optimal control technology for gas turbines

One of the most critical protection systems for rotating machinery. Overspeed control.

HEINZMANN developed the VOP O3 unit to monitor 3 speed probes with 2 out of 3 voting to protect the machinery. Installed on many gas turbines and reciprocating engines alike. Gearboxes, turbos and other critical systems.

Overview

Overspeed Protection Unit

The VOP 03 is a Triple Voting Overspeed Protection Unit. It has 3 speed channels, each one monitored totally independently whilst the two out of three voting system considers the output from each channel. At least two of the channels must agree an over frequency and trip simultaneously for the overall voting contact to trip the turbine. Each channel can be tested while running and replaced, hot swap, while the machinery is running. The design provides protection from nuisance trips.

Technical data

Power supply: 18 ... 32 VDC @ 0.6 A
Operating temperature: - 20 ... +70 °C
Hot swap: Each module can be changed while unit is running
Speed range: 50 Hz ... 25kHz

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Technical Drawing

Data Sheet

Two out of three voting system to protect turbo machinery from overspeed
Accurate and repeatable to 0.1 %
The design provides protection from nuisance trips
Only individual channels will trip on fault, at least two channels have to agree on fault
Monitors three individual magnetic pickups in three independent modules whose voted output appears on a high integrity dry contact output
Easy to calibrate through maintenance program to set the trip frequency
Easily tested whilst operating through onboard frequency generator housed on board each of the three modules
Hermetically sealed relays and fully isolated frequency inputs guarantee quality and longevity and accuracy of speed measurement
Each unit fully isolated and only connected to the other channels via volt free voting relay contacts
Motherboard PCB is tracked in a voting system so two or more of the individual channel relays must sense overspeed before the common fault contact opens
Built-in test mode and signal generators allow the channel to be tested and tripped

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