Designed for monitoring and protecting the rotor winding of synchronous machines
Rotoguard
Rotoguard
Lack of maintenance, operational knowledge or monitoring systems can cause catastrophic failures in large machines and with this in mind, our experts have designed a state of the art system which provides protection, operational information and ongoing monitoring, allowing detection of early signs of deterioration.
- Designed for monitoring and protecting the rotor winding of synchronous machines
- Forms the basis for an ideal protection scheme for synchronous machine rotors
- Enables the true measurement of fault resistance from 0 to 100kΩ
- Not influenced by the DC field component of excitation or by high capacitance systems
- Provides an early warning of deterioration of the rotor insulation, a continuous readout of the rotor earth leakage resistance and winding temperature
- Being separately powered, the system is active at all times
- Stores the last 24 hours of recorded data
| Display | 4-line vacuum fluorescent alphanumeric display Green LED: flashing once every 4 seconds to indicate correct operation of the connected modules |
| Outputs | 4-20mA loops: - Voltage - Current - Leakage resistance - Temperature Earth Fault Relay output USB port to connect to a PC (Mini USB ‘B’, IP68) |
| Earth Fault Level | 0-100Ω, user adjustable (Default setting 5Ω) |
| Operation Time | 4 seconds maximum, (temperature averaged over 12 readings) |
| Max. field voltage | Continuous ± 600V DC Transient ± 1000V DC |
| Cable Types | Distance between machine mounted unit and Rotoguard Monitor: Power - Up to 100 metres: 2 core 2.5mm2 - Up to 300 metres: 2 core 4.0mm2 - Up to 1000 metres: 2 core 10.0mm2 Signal - Up to 300 metres: Coax RG223/U - Up to 1000 metres: Coax RG |
| Output relay rating | 3 Amps maximum (250V AC) (resistive), 0.5 Amps maximum (50V DC) (resistive) |
| Input voltage | 100-240V, 50-60Hz, Input fuse: UL/IEC127 250 Vac S 3.15 A |
| Rack dimensions | 3U 19 inch rack |
| Certifications | Sira 03ATEX4219U (Ex nA mc IIC Gc, II 3G) IECEx SIR 14.0005U |
Can be retrofitted to most over hung exciters
Earth Leakage and Rotor voltage values are displayed
Addition of a shaft mounted current shunt displays Rotor Current and Rotor Winding temperature
Monitors for earth fault whilst machine is stationary and during run-up as well as during normal operation
No sliprings or brushes means reduced maintenance
Certified for hazardous area applications
Continuous stream of instantaneous readings updated every four seconds
Complete set of one-minute averages for the previous thirty-four hours
Download data for time history of rotor op. conditions to review in event of machine breakdown
4 isolated 4-20mA loops for remote display of voltage, current, temperature and leakage
Rotor Module is designed to accommodate a purpose built optional Encapsulated RC unit
A Shaft Mounted Current Shunt can be added allowing rotor current and rotor winding temperature to be displayed
Rotor Module is designed to accommodate a purpose built optional Encapsulated RC unit
A Rotor with an 80mm bore is available (ATEX/IECEx certified) allowing the Rotor to be installed over a shaft, which can be used to drive further end-of-shaft devices such as a fan or oil pump
A shunt summing module can be fitted allowing the readings from up to 3 shunts to be averaged
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Quartzelec Ltd, Castle Mound Way, Central Park, Rugby, Warwickshire, CV23 0WB
Quartzelec is proud to be certified by:
