Micro ohm meter

DARES-200 is a micro-ohmmeter produced using advanced engineering technologies which can apply up to 200 A current. With its easy-to-use software, DARES-200 can easily measure contact resistances of circuit breaker, shunt and disconnector by applying adjustable current from 1A to 200A.

It can calculate the real values of the resistors by providing penetration with the feature of the continuous current application. DARES-200 can measure from 0.1 µ Ω to 5 Ω. DARES-200 is capable of measuring static and dynamic resistance of the contact points of the circuit breaker.

The HighTest data management platform (DMP Software) can also be used to control DARES-200 remotely by a PC and the measurement results can be easily analysed and stored in the PC.

With the DARES-200’s Bluetooth option, tests can be started remotely via DMP software and the results can be transferred to the PC. Thus, on-field tests can be performed even by a single person.

With DARES-200’s temperature measurement channel, the temperature values of the measured sample can be taken and calculated according to the desired temperature value. DARES-200 is a compact, rugged device with IP67 protection class (case closed) which weighs 9 kg.

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 measured in periodic control of 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.

DARES-200 can apply 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 DARES-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 on circuit breakers.

FEATURES

• Contact Resistance Measurement
• Adjustable Current: 1 A to 200 A
• Measurement Range from 0.1 µ Ω to 5 Ω
• Typical Accuracy 0.1%
• Static Resistance Measurement
• Dynamic Resistance Measurement
• Dual Ground Test mode
• Built-in Printer
• Optional Current Clamp
• Internal Memory USB Flash Drive
• PC control via USB cable
• Optional Bluetooth control & communication
• 3-inch TFT touch Display
• Protection Class: IP67 (case closed)

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 on circuit breakers. 

With the DARES-200 BLUE’s built-in Bluetooth, tests can be started remotely via DMP software and the results can be transferred to the PC. Thus, on-field tests can be performed even by a single person.