Shaft voltage current monitoring software

Generator stator core condition monitoring by tracking shaft. The phenomenon of voltages and currents on motor and generator shafts has been known for the last 100 years 1, 2. Iris power solutions provide information to plan maintenance in time to avoid damage to generator bearings, shaft journals, couplings, and gears. Measuring motor shaft voltage discharges with fluke mda550. Optimisation of shaft voltage based condition monitoring. Shaft voltage is only present while the motor is energized, rotating, and warmed up to normal operating temperature. Loss of any phase, phase reversal, over voltage, under voltage and voltage unbalance.

The monitoring system employs a shaft voltagecurrent monitor the vcm which. It affects motors, hydro generators and turbo generators. The main purpose of shaft current and voltage protection scvp system is to detect shaft currents and voltages that may damage the generator bearing, and. Accepts currents from existing grounding brushes using two different shunt values. When this rotor shaft voltage exceeds the insulating capacity of the bearing grease, voltage arcs or electrical discharge machining can occur, causing pitting and fluting of the motor bearing race, damage that can cause a motor to fail prematurely. Tracking the shaft voltage and current activity is essential on critical andor large rotating machinery, such as utility turbinegenerator units. Integrates modbus device data to iec 61850 protocol for accurate data. An overview of shaft voltages and bearing currents in. The voltagecurrent monitor is available in two different models. Online monitoring of shaft voltages and current iris power.

Measuring motor shaft voltage discharges with fluke mda. Transformer bushing monitoring higher accuracy leads to better fault detections article written by thomas linn. Intelligent, webenabled, programmable rtu perfect for the combined metering of water, air, gas, electricity and steam. Continuously monitors up to 4 inputs including 2 voltage and 2 current. Remote terminal unit rtu for data acquisition and integrated utilities metering. The shaft current transformer type ildd required for the relay measurement of the shaft current is a special designed transformer. The bandwidth of the shaft voltage signal recorded and the characteristic time evolution have pointed out the electrostatic charges produced by the turbine steam as. The shaft voltage must contain a third harmonic component if version 2 is to be used. Finally it seems that there is a lack of knowledge in the shaft voltage as a tool. Monitoring of shaft voltages and grounding currents in rotating machines abstract. The genadvisor shaft voltage and shaft grounding current svc monitoring system is designed for continuous monitoring of shaft voltage and shaft. The smview software provides fft analysis of the results and.

These continuously monitored signals are the keys to machine condition determination and can provide an early warning of developing unit problems. This system collects and analyzes data from up to two voltage and two current inputs in real time, providing maintenance staff with a tool to collect and trend shaft. Our solution in form of an easytoinstall protection relay provides measurement and analysis of shaft voltage and current which may damage the generator bearing. Shaft current and voltage signals are fed to an active termination box and then to a monitor to facilitate continuous monitoring and processing of the shaft grounding current and the shaft voltage. The system claims to detect and identify a number of problems and conditions listed in the first paragraph and which, if not corrected, would eventually lead to. Voltage pulses from a variable speed drive can couple from a motors stator to its rotor, causing a voltage to appear on the rotor shaft. Us64600b1 shaft voltage current monitoring system for early. The shaft voltagecurrent monitor based on this patent and manufactured by. Shaft voltage occurs in electric motors and generators due to rotor winding ground fault, spikes caused by the rotor excitation system, magnetized generator parts and magnetic fields. Monitoring of shaft voltages and grounding currents in. Online monitoring can help with the early detection of indicators such as changes in shaft voltage or shaft grounding current. Shaft current and voltage protection koncar monitoring. Providing continuous shaft voltage and current measurement using voltage brushes and the shaft grounding brush. Up to 20% of major transformer failures can be tracked back to bushings.