Why do we measure contact transition resistance at breakers?
When high current passes over the switchyard, circuit breakers open the circuits or at the points where high current passes it acts as closing switches. Resistance value that measured in periodic control of the circuit breaker should be the same as the resistance value in the closed position which is very important for system safety. High resistance values may cause local hotspots, voltage drops, fire risk, unplanned power failure, and extra energy loss in the system. Maximum accuracy measurement with the 4-wire method (kelvin method) will indicate whether the breaker contacts are properly contacted, if there is any corrosion on the contacts, or it shows if there is an effect that increases the resistance. ARES-200 can flow up to 200 A current through its current cable and measure the voltage drop on both sides of the resistance with the sense terminal. Thus the calculated resistance value displayed on ARES-200 is not affected by the resistance of the measuring cable.
Why dynamic resistance meter?
In the circuit breakers, the time-dependent graph of the measured resistance when the breaker is switched from closed to open can be obtained to determine whether the contacts are deformed. This cannot be detected by measuring the circuit breaker only in the closed position. For this reason, dynamic resistance measurement is done in circuit breakers.
|Measurement Modes||Static Resistance, Dynamic Resistance, Dual ground|
|Test Current||1 A to 200 A|
|Measurement Range||0.1 ?? to 5 ?|
|Accuracy||Typical: 0.1% ? 0.1% Fs Guaranteed: 0.5% ? 0.1% Fs|
|Display||4.3 inch TFT touch Display (visible under sunlight)|
|Memory||Up to 100 records with 25 intervals for each|
|Communication||USB, Pen drive, Built-in Bluetooth|
|PC software||DMP Software|
|Printer||2.25 inches Built-in Printer|
|Test Plan||Up to 6 plan|
|Power Supply||100-240 V 50/60 Hz|
|Dimensions||16.7? x 13.4? x 6.8? (424 mm x 340 mm x 173 mm)|
|Operating and storage?temperature||Working -10 to 50 C Storage -30 to 70 C|
|Humidity||95% RH non condensing|
|Protection Class||IP65 (case closed)|
|Set of Package||ARES-200, Power Cable, USB Cable, 33 Feet Measurement Cable, Ground Cable, Cable Bag, 2 Printer Paper, User Manual, DMP Software|
|Options||Hard Carrying Case, Current clamp, Customized Cable Length|