ZKZ-3S type speed monitoring device is connected with a tooth disc pulse sensor and voltage transformer signal, speed monitoring unit, the instrument can display the actual value of speed, speed percentage, generator frequency and other parameters, the output of the 12 switch and 1 - channel analog instrument. Only node voltage transformer signal, the residual pressure by way of measuring the frequency, speed monitoring 1 road junction, meter pulse signal and the signal voltage transformer, through the gear plate residual voltage measurement, monitoring speed meter node 2 way pulse signal and the voltage transformer signal based on the pulse sensor probe installation position can be set or the conventional monitoring of pumped storage units (pump turbine), routine monitoring unit, 2 the probe installed in any of 2 teeth in the center, while collecting 3 meter input signal, according to the calculation principle of 3 2 were monitored, with high reliability, monitoring of pumped storage units (pump turbine), 2 probe strictly according to figure 5 As shown in the installation, the instrument carries out a logical judgment of the 2 probe positions to identify the positive axis reversal of the unit.