kocos precision resistance tester promet se
TRANSCRIPT
PROMET SEPrecision Ohm Meter
Condition & Analysis of • Electrical contacts• Breaker Main Contacts
PROMET SE
Content
Problem
Effects on a connection
Solution
PROMET SE
Electrical plant and equipment:Cross temperatures must not be exceeded
Resistance increase with operating time
Heating by power loss
Ageing connections
Which 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
Switching devices
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
Micro contacts
Small effective area Greater resistance
P = R I2
Contact resistance
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 devices
PROMET SEPrecision Ohm Meter
Stand-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, …
Stand-alone
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
External control
PROMET SE
PROMET SE
Specifications
PROMET SE
Housing Hand case(200 x 178 x 100) mm
With strap for attachment to the breakerTransport case
Weight 1,5 kg (without accessories)
Connection 4 mm safety plugs9 mm high current plugs
Current up to 200 A
Current/Voltage channels
2
Terminal voltage
~ 2,5 VDC
Resistance up to 200mΩ
Power supply - Battery back-up (all day measurement)- External power supply (AC-Adapter)