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Shaft Current and Voltage Protection (SCVP)

Shaft Current and Voltage Protection (SCVP)
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Shaft Current and Voltage Protection (SCVP) - 1

KONČAR – Electrical Engineering Institute Inc. Department for Rotating Machines Fallerovo šetalište 22, 10 000 Zagreb, Croatia Phone: + 385 1 3656 291 Fax: +385 1 3666 377 Web: www.koncarmonitoring.com Email: mcm@koncar-institut.

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Shaft Current and Voltage Protection (SCVP) - 2

Operator panel - HMI (real time data, trends, spectrum, alarms , setup…) SHAFT CURRENT AND VOLTAGE PROTECTION Due to magnetic field asymmetry in the machine, voltage in the shaft can be induced, which, depending on the type of machine, its size and load, varies in amplitude and frequency composition. Low circuit impedance consisting of shaft, bearing, oil film and other structural components, can cause shaft current flow which leads to bearing destruction. Shaft Current and Voltage Protection Relay (SCVP) is used to measure/analyze shaft voltage and current that may damage the generator...

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Shaft Current and Voltage Protection (SCVP) - 3

SCVP Benefits Worldwide recognized and implemented INSTALLATION • Installation without machine interruption and integration with other systems SCVP has found its place on many hydro and turbo generators around the globe. Our customers recognize its value and the importance of monitoring one of the biggest issues that arise during the generator usage (e.g. SCADA) • Web integration into a single access point which supervises critical equipment in multiple power plants CONNECTIVITY • Integration of multiple user accounts into one user application • Innovative technology which connects local...

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Shaft Current and Voltage Protection (SCVP) - 4

1. SCVP specification Architecture: • Two channel acquisition unit with real time controller Current input: • Measuring range: Oto± 50 mA • O verload: 300 mA • Measuring error: < 0,05 mA for 0 to 50 mA measuring range • Frequency range: up the 10 kHz • Input resistance: 5 D • Input capacitance: 1 nF • Test voltage: 4 kV Rated isolation voltage: 600 V overload (category III) by EN 50178 Surge withstand: 5 kV (1,25/50 ps), by IEC 255-4 SCVP 2. Measuring sensors ■—Instrument transformer (current measurement): • Rated voltage: 0,7kV • Insulation level: 3 kV • Transfer ratio: typically 1:1000 •...

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Shaft Current and Voltage Protection (SCVP) - 5

Depending on the selected SCVP type, users can get insight into measuring data through local touch display (local HMI) and through web server (web application). Local visualization enables insight into real-time data (waveform and spectrum) and setup. All screens can be modified according to the Customer’s requests which includes native language. V1 version (basic configuration) This system enables measurement, online FFT signal analysis and protection by outputs relays. Alarm and trip signal can be configured (limit and delay). 1 V1 version...

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Shaft Current and Voltage Protection (SCVP) - 6

Order example Example of Customer request: SENSORS, CABELS, SENSOR HOLDERS Measurement of shaft current with instrument transformer (shaft diameter = 1000 mm) Measurement of shaft voltage Number of analogue inputs = 2, number of digital outputs/relays = 4 V1 version of SCVP Sensor holders (set) DOCUMENTATION Complete scope of the documentation ELECTRICAL CABINET SCVP version in electrical cabinet User training Electrical cabinet SCVP version SCVP inputs/outputs SCVP sensors SCVP S - Sliding brush with holder x 2

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