West Blue Hengyuan ZDL-LB01 Axis Current Monitoring Device

West Blue Hengyuan ZDL-LB01 Axis Current Monitoring Device

West Blue Hengyuan ZDL-LB01 Axis Current Monitoring Device

The ZDL axis current monitoring device is an intelligent electrical monitoring device built with MCU as the core component. This monitoring device is used in conjunction with the shaft current transformer to achieve the function of monitoring the shaft current of the generator in the hydro generator set.

The magnetic field generated by the asymmetry of generator manufacturing will generate induced potential between the two shaft ends of the generator. When the insulation of the bearing is damaged, the induced potential will generate induced current in the closed circuit formed by the shaft, bearing, and frame, that is, the shaft current. The shaft current has a further destructive effect on the bearing, and the longer the duration and the greater the amplitude of the current, the greater the destructive effect. The shaft current monitoring device can monitor the shaft current. When the shaft current exceeds the warning value, an alarm signal is issued to prompt the user to maintain the bearing insulation.

The monitoring device is a microprocessor systemMCU as the core, configured with ADCADC、485 communication functional components. The microprocessor will be processed through analog circuitsThe subsequent current input signal is passed throughConvert ADC into corresponding collected data as measurement values; Compare the measured value with the alarm set value. If the measured value exceeds the limit, a passive contact will be issuedFormal alarm signals; Simultaneously throughThe DAC outputs a 4-20mA analog signal proportional to the measured value, as well as digital measurement values and status signals output through the RS485 communication interface.

The current in the working winding of the shaft current transformer is proportional to the induced current in the main shaft. Pass the current in the working winding throughAfter I/V conversion and anti-interference processing, the signals are filtered through three channels (full signal channel, fundamental channel, and third harmonic channel), and the filtered signals are then sent to three independent channels in the DAC for data acquisition.

instrumentIt includes a four digit digital display and six operation buttons. The digital display is used to display real-time measurement values and set parameter values, while the operation buttons are used to set parameters, switch display measurement values, and trigger test functions.

True effective value measurement

The measurement is the true effective value of the current（True RMS）， Therefore, the measurement is more accurate.

When the component of the shaft current is not a single frequency sine wave, the peak coefficient varies due to different component ratios. At this point, non true effective value measurement methods will introduce measurement errors, and the larger the peak coefficient, the greater the error.

Group measurement

Simultaneously measure the values of three currents, namely the full signal current value, fundamental wave, and third harmonic current value.

When the shaft current transformer is placed in an environment with a large fundamental leakage flux from the generator, to avoid fundamental interference, the third harmonic current value can be selected as the participating comparison current for alarm.

Reference current can be selected

You can select to participate in the alarm in the parameter settingsAnd current outputCompare the amount of current.threeThe options are: full signal current value, fundamental current value, and third harmonic current value.

environmental parameters

Operating Temperature5~45 ℃ Storage temperature: -40~60 ℃ Relative humidity: ≤ 90%

Shell grade:IP40

power supply

voltageAC/DC220VOther power sources can be customized.

Power:≤25W。

Optional range:5A/10A/20A/40A/80A。

Measurement accuracy: superior to1.0 level (within the range of 0.1 to full scale).

Measurement signal: The components are mainly fundamental and third harmonic.

Alarm contact point

quantity2 pairs of SPDT capacity: 2A/AV250V or 2A/DC30V

Analog output

quantityRange of 1 channel: 4~20mA corresponds to 0~full range

Loop voltageAt 24V, the sampling load resistance is ≤ 500 Ω.

digital output 1 RS485 interface