PROMET SEPrecision Ohm Meter
Condition & Analysis of Electrical contacts Breaker Main ContactsPROMET SE
Effects on a connection
Electrical plant and equipment:Cross temperatures must not be exceeded
Resistance increase with operating time
Heating by power loss
Ageing connectionsWhich problem is to be solved?
Switching devices are essential equipment in a substation.
The current must be interrupted save if a failure occurs.
To guarantee the operation the circuit breaker need maintenance.
Reasons: Wear of the moving parts Leak on valves and seals Failures in control circuits Deterioration of contact parts
Reliable operation is endangered
Power supply companies want to avoid interruptions of energy transport
Inspection and maintenance of equipment
Lifetime and Functionality
Contact: 2 surfaces
Contact surface: rough
Small effective area Greater resistance
P = R I2
Which affects the temperature of a connection?
OxidationOxide layer reduce current bearing area
Contact wearMechanical effect movement, friction and arc effect
Contact forceForce can decrease: e.g. loose or misaligned contact
increase the contact temperature, leading to its destruction
Further effects for contact resistance
New solution for connections and switching devicesPROMET SEPrecision Ohm MeterStand-alone unit and external control via ACTAS systems
Static- and dynamic resistance measurement
Stand alone device
Up to 200 A
Small lightweight box
Independent from mains voltage
Static resistance measurement
Quality of contactse.g. busbar, earthing switches,
Via ACTAS Digital communication
Up to 200 A
2 breaks per phaseTotal: 3 x 2 chambers
Connection direct at the chamber Short current and voltage cables Less weight
Static and dynamic measurement Synchronization betweenpoles and chambers
PROMET SEPROMET SE
SpecificationsPROMET SEHousingHand case(200 x 178 x 100) mmWith strap for attachment to the breakerTransport caseWeight1,5 kg (without accessories)Connection4 mm safety plugs9 mm high current plugsCurrentup to 200 ACurrent/Voltage channels2Terminal voltage~ 2,5 VDCResistanceup to 200mPower supply- Battery back-up (all day measurement)- External power supply (AC-Adapter)