High and Medium Voltage Circuit Breaker Testing The word ‘Megger’ is a registered trademark Copyright © 2016 Megger Limited, Archcliffe Road, Dover CT17 9EN, Englan

Circuit Breaker Testing INDEX High and Medium Voltage Circuit Breaker Testing Circuit Breaker Testing. 1. Breakers are main protection of power system on high voltage side. ■■ Insulation resistance test Product selection guide Safety first ■■ Travel (stroke, speed, damping, wipe) 2. They are ”extended arm” of relay protection trip contacts 3. Assurance that the breaker will operate when needed ■■ After service (re-commissioning) Circuit breaker analyzer system ■■ Operating coil current CIRCUIT BREAKER - COMMON FAULTS* Vacuum interrupter tester 28% t Does no close on nd comma Contact resistance...

High voltage circuit breakers are extremely important for the function of modern electric power supply systems. The breaker is the active link that ultimately has the role of operating the primary circuit when a fault has occurred. The breaker has to perform its duty within a few milliseconds, after months, perhaps years of idly standing by. Since Reliability Centered Maintenance (RCM) and condition based maintenance have become the established strategies for most owners and operators of electric power supply systems, the need for reliable and accurate field test instruments is obvious. Ever...

Multi interrupter and common/individual operating mechanism Two interrupters and common/individual operating mechanism ■ Modular design to precisely match your needs ■ Available with full stand-alone functionality or as data acquisition units without user interface ■ Adapt hardware configuration in the field ■ Fast and safe with DualGround™ testing ■ First trip and online measurement ■ Rugged and reliable for field use The modular design makes it possible to configure the TM1800 for measurements on all known types of circuit breakers in operation on the world market. The robust design product...

Single interrupter and common operating mechanism Power supply unit B10E ■ Stable a.c. and d.c. power supply for circuit breaker testing ■ Continuously variable 24-250 V AC or DC output ■ Lightweight <7 kg ■ Extremely easy-to-use and reliable ■ Separate outputs for close coil, trip coil and spring charging motor voltage ■ Two dedicated timing channels for auxiliary contacts ■ Direct triggering for minimum pick-up test ■ Multipurpose analog measurement channel Supplies power conveniently to breaker coils and springcharging motors. Since this power is unaffected by load and virtually ripple-free,...

DRM is a reliable method to estimate the length/wear of arcing contact Static & Dynamic Resistance SDRM202 ■ Accurate DRM results through high current supply 2 x 200 A ■ Fast charge - minimum waiting intervals ■ Low weight, 4.3 kg incl. cables Rjfidd CUTVti |A| I 200 ftjfled Supply VoRege 325V DC Iram-iyeirte mWium Rated Frequency |liizf Rated Motor VaRagn |V| 240 VAC Breaker Analyzer software CAB A Win ■ Pre-defined standard test plans enables quick and easy testing ■ Test Plan Editor to easily create customized test plans ■ Accurate comparison with historical test results ■ Convenient...

Vacuum interrupter tester VIDAR ■ Low weight and small size ■ Fast test and easy to use ■ Immediate pass/fail feedback ■ 10-60 kV DC test voltage VIDAR tests vacuum in circuit breaker chambers using DC voltage. When AC is used, the capacitive component of the current flowing through the chamber must be tested. With DC, this is eliminated. The resistive component of the leakage current is very small compared with the capacitive component, because of the high dielectric strength of the chamber. The DC flashover voltage is equal to the peak AC voltage. Testing can be completed in a few minutes. High...

Contact resistance testing For testing circuit breaker contact resistance in compliance with IEC62271 and IEEE C37.09 specialized low recistance testers are used with a high output current. For this and other applications that require a higher test current, we offer an extensive range of testers that will fit your testing regime. A high current output is one of the qualifying characteristics of a true low resistance ohmmeter. Ordinary multimeters do not supply enough current to give a reliable indication of the current-carrying capabilities of joints, welds and bonds under real operating conditions. Little...

■ CT’s demagnitization through AC output ■ Memory for 300 test results and notes ■ RS232 port for download results or printing in real time ■ Complies with IEEE and IEC standards Battery operated 100 A Low Resistance ■ 200 A or 600 A DC output current ■ CAT IV 600 VAC / 500 VDC for safe operation ■ True DC – ripple free current ■ Lightweight 100 A battery powered unit for portability ■ High noise immunity for stable readings ■ Smooth and ripple free DC Output High and Medium Voltage Circuit Breaker Testing ■ Fully automatic testing - micro-processor controlled ■ Mjölne

Circuit Breaker Application Examples First trip and online test A good and time effective way to check the condition of a circuit breaker is to document its behavior at the first open operation after it has been idle for long time. The measurement and connections to the circuit breaker are carried out while it is still in service. All of the connections are made inside the control cabinet. The biggest benefit of using first trip testing is to test “real world” operating conditions. Another benefit with this method since the breaker is measured online is that it can be used to quickly screen the breaker...