XJZC-03A/Q speed impactor monitoring device suitable for steam turbines

Technical Specifications
Power supply: 220VAC ± 10% 50HZ
Input signal:
Speed measurement signal: ZS-1 reluctance speed sensor signal amplitude is 50mV-20V (RMS) frequency response is 0.5-15kHz
Signal of impactor 1: ZS-1 magneto resistive speed sensor or integrated eddy current sensor
Signal of impactor 2: ZS-1 magneto resistive speed sensor or integrated eddy current sensor
Parameter settings:
Number of teeth: 1-120 (set to 60 at the factory);
Alarm value: Level 2 alarm, set alarm value I to 3300rpm and alarm value II to 3360rpm respectively when leaving the factory;
Alarm delay: At the factory, it can be set to 1-6 seconds according to user requirements, usually 1 second. Measurement display:
Display mode: Four digit 0.8-inch LED digital display
Range: 1~9999rpm
Display accuracy: ± 1rpm
Measurement output:
Current quantity: 4-20mA current proportional to the speed value, accuracy ± 1%, load ≤ 500 Ω
Switching quantity: Four normally open contacts of the output alarm I, II, and the impact sub 1 #, 2 # relays are closed when an event occurs, with a contact capacity of 2A/250V AC or 1A/28V DC
Warning signal: The panel is equipped with alarm I, II and collision sub 1 #, 2 # indicator lights. When an event occurs, the corresponding indicator lights will light up.
Environmental Requirements
Environmental temperature: During operation: 0 ℃~65 ℃
Storage time: -30~80 ℃
Relative humidity: up to 95%, non condensing, non corrosive, and non strong magnetic field
Dimensions: 160 × 80 × 200mm
Hole size: 152+1X76+1mm
Weight: Approximately 843g XJZC-03A/Q speed impactor monitoring device suitable for steam turbines. This monitoring device adopts microcomputer intelligent technology to provide a comprehensive speed and impactor status monitoring solution for steam turbines. The device continuously displays the speed during operation and saves the highest speed it has reached. When the emergency governor is activated, it can reliably capture the events of "striking" and "retracting" and remember the speed at that time. Users can easily switch and display these stored key speed values through the panel buttons. Overview
Speed is an important operating monitoring parameter for steam turbine units. When the unit speed reaches 110% of the rated speed, the steam turbine should be shut down urgently. To achieve this goal, the unit security system is equipped with an emergency governor in the front bearing box of the steam turbine. The emergency governor impactor is "ejected" by the centrifugal force generated at 110% of the rated speed, which can cause the steam turbine to shut down urgently.
Before the new unit is put into operation or the unit is connected to the grid for each major overhaul, the speed of the impactor action must be measured. To prevent jamming of the impact nozzle, the manufacturer stipulates that the unit should undergo an impact nozzle fuel injection activity test after continuous operation for 2043 hours. However, the installation location of the emergency governor cannot observe the "striking" and "retracting" states of its impactor, nor can it determine the rotational speed when the impactor acts.
The intelligent tachometer/impactor monitoring device adopts microcomputer intelligent technology to solve the problems of speed monitoring and impactor monitoring. It usually displays the turbine speed and captures and records the "highest" speed of the unit. When the emergency governor impactor "hits" or "retracts", the internal memory function stores the speed at the time of "hitting" or "retracting" in the instrument. By pressing the "Settings" button on the panel, the speed at the time of "highest", "hitting" or "retracting" can be easily displayed in the display window. XJZC-03A/Q speed impactor monitoring device is suitable for steam turbines