Steam turbine rotation speed is a major monitoring content in operation, and the emergency governer is one of the main parts of the turbine safety system. When rotation speed of the turbine reaches 110% rated speed, the emergency governor bolt knocks out under the centrifugal force, so that the turbine can be shut down. It is necessary to use the Rotation Speed Impactor Monitor HZQW-03A test the bolt and inspect its trigger speed before a new unit is put into operation, or before the unit is grid-connected to the network after overhaul. If the bolt stays stationary for a long time during operation, the oil injection test should be tested on the bolt regularly after 2000 hours continuous operation in order to prevent jam.
Technical Specification
| Measuring Range | 0000 to 9999 RPM |
| Accuracy | n ≤ ±1 RPM |
| Detectable Speed of Bolt | n > 2570 RPM |
| Alarm Value | “Level 1" is 3300 RPM, “Level 2" is 3420 RPM. The two levels are normal open contacts. |
| Contact Output Capacity | AC250V 5A or DC 27V 5A |
| Power Supply | AC220V 15VA |
| Dimension | 160 x 80 x 320 mm |
| Mounting Hole Size | 152 x 76 mm |
If there is any special requirement, please inform at the time of order.
Working Principle
When the bolt knocks out, the sensor detects the signal at the frequency of 49~60 HZ. The detected signal is analyzed by microprocessor after being rectified. If it is identified as a knock-out signal of the bolt, the device will store the speed of the first pulse signal in the memory immediately. When the speed decreases and the bolt is Backed, the rotational speed is also stored. The above data can be reproduced on the screen by operating buttons on the panel of Rotation Speed Impactor Monitor HZQW-03A.
