PRODUCTS TEST & MEASUREMENT
SIMPLER AND FASTER EARTH GROUND TESTING For each test, the tester indicates which stakes or
Two new Earth Ground Testers have been introduced by Fluke to help maintain up-time and lower the risk of electric shock to personnel. The Fluke 1623-2 and 1625-2 GEO Earth Ground Testers offer automated data collection and storage, with download capabilities via a USB port, eliminating data entry and recording errors. The choice of models targets
electrical contractors, industrial maintenance technicians and power utilities and telecom engineers. The higher end 1625-2 features Automatic Frequency Control (AFC) which identifies interference and chooses measurement frequency to provide an even more accurate earth ground value. Optional colour coded wires provide easier identification and deploying of wire reels and stakes, thus offering faster set-up. A lack of proper grounding also increases the risk
of equipment failure. Without an effective grounding system, electrical devices are subject to instrumentation errors, harmonic distortion issues, power factor problems and a host of possible intermittent dilemmas. Studies show that as much as 25% of power quality problems are related to poor grounding. The new IP56 rated Fluke 1623-2 and 1652-2 GEO Earth Ground Testers can perform all four types of earth ground measurement.
clamps need to be connected and the large rotary switch can be used even with a gloved hand. Other features on the Fluke 1625-2 include R* measurement, which calculates earth ground impedance at 55Hz to more accurately reflect the earth ground resistance than a fault-to-earth ground would see, and adjustable limits for quicker testing. With the stakeless test
method, two clamps are placed around the earth ground rod
and both are connected to the tester - no earth ground stakes
are used at all. The tester automatically determines the resistance of the earth ground
rod which does not need to be disconnected - leaving the bonded earth ground system intact during test. This enables tests inside buildings, of power pylons, and anywhere there is no access to soil. This test method only works if a bonded earth ground system exists for the building or structure under test, but most are. If there is only one path to ground, as at many residential applications, the stakeless method will not provide an acceptable value and the Fall of Potential test method must be used.
Fluke
www.fluke.co.uk T: 0207 942 0700
Enter 212 RELIABLE DETECTION FOR HIGH VOLUME INSTALLATIONS
The new next generation S18-2 compact photoelectric sensor series from Banner are self contained, DC operated sensors that provide a sensing solution for cost sensitive and high volume installations. Built with Advanced ASIC (Application Specific Integrated Circuit) technology, the diffuse mode S18-2 sensors are resistant to fluorescent light and offer a high level of crosstalk avoidance. Banner S18-2 sensors feature a powerful and bright visible red emitter beam that reaches up to 25m (82ft), which allows for easy
alignment and set-up. The indicators are comprised of one green and two yellow LED lights. Solid green indicates power is applied and the sensor is ready, while green flashing specifies a marginal sensing signal. The two bright yellow LEDs, visible from both sides of the sensor, indicate the output is conducting. Featuring a rugged ABS plastic housing, the S18-2 sensors are well sealed against water ingress. A wide
operating temperature range of -40 to 70°C ensures optimal performance for diverse applications. For increased flexibility, diffuse models provide a 250° sensitivity potentiometer.
Turck Banner
www.turckbanner.com T: 01268 578 888 Enter 213 ATTACHING TEST LEADS SAFELY, FIRMLY AND QUICKLY
Test leads can be quickly and safely attached to hex socket screws using the new Variogrip adapters from Multi-Contact. The adapters have a split hexagonal tip that expands on turning a knob at the rear so that it is firmly held inside the socket. This arrangement produces multiple contact points which
ensure low contact resistance. The adapter can be safely attached or removed while the screws are electrically live. The Variogrip adapters are rated at 1,000V, CAT IV and 24A
and are available in two sizes, for 5mm and 6mm hex sockets, having a grey or black knob respectively. They are available in black, red or blue, and accept 4mm
safety leads. To maintain the CAT IV rating, appropriately rated leads should be used.
Multi-Contact
www.multi-contact.com T: 01908 265 544
20 MAY 2014 | ELECTRICAL ENGINEERING Enter 214 / ELECTRICALENGINEERING
The new MAC-TS4 vacuum interrupter tester from Vacuum Interrupters is capable of conducting predictive testing on vacuum interrupters in the field. The MAC-TS4 is the third generation
of the MAC product line. The MAC-TS4 uses magnetron atmospheric condition (MAC) testing to measure actual ion current against known values to determine vacuum interrupter internal pressure. The MAC-TS4 test set can avoid unnecessary damage to circuit breakers and contactors by identifying interrupters that are approaching an unsafe pressure. Vacuum Interrupters’ patented flexible
magnetic field coil enables technicians to test most vacuum interrupters installed in the circuit breaker without having to remove the interrupter. Until now, the only accepted field
service test for vacuum interrupters has been a simple pass/fail test performed with an AC high potential (HiPot) test. The MAC-TS4 is provided with everything required to determine the pressure of your vacuum interrupter in the field, shop or lab. Newest features include a back-lit LCD display, detachable high voltage cables, a built-in thermal printer and PC compatibility. This PC friendly version can store hundreds of test results and allows the operator to download and generate reports. Finley Ledbetter, CEO and chief
scientist of Group CBS (Vacuum Interrupters is an affiliate company of Group CBS), commented, “Our MAC- TS4 vacuum interrupter test set can easily determine the pressure inside a vacuum interrupter and, along with wear and number of operations, predict the usable life of the vacuum interrupters used in your circuit breakers and contactors.”
Vacuum Interrupters
www.vacuuminterruptersinc.com T: 07770 500 577
PREDICTIVE TESTING IN THE FIELD
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