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- LBA Group, Inc
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RF Inductors
LBA Technology "Blue Line" RF inductors are based on over 30 years of proven international performance. Blue Line inductors are unsurpassed for hi-Q, stability, and low RF losses. These inductors are manufactured from heavy silver plated copper conductors and brass fittings, treated to resist tarnishing. Windings are insulated with melamine or G-1 0 epoxy laminates. These materials are recognized for their exceptional RF qualities, arc resistance, mechanical strength, and low moisture absorption. Supporting frames are engineered to permit maximum access to windings for convenience in adjustment. The metallic frames are separated by insulators to prevent induced current flow.
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Transformer DC Winding Resistance Tester
HTZZ-5A / 230
Wuhan Huatian Electric Power Automation Co., Ltd.
Applicable for transformer to submit the dc resistance testproject around group in pick up and overhaul project.
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Transformer Winding Resistance Testers / TRT ? 2
TRT-2
UDEYRAJ ELECTRICALS PRIVATE LIMITED
Fast measurement: Test current 0.02A to 2A DC, Digital display of resistance and test current.
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10A DIGITAL MICRO-OHMMETER
MPK-2000e
The MPK-2000e digital very low resistance ohmmeter is a portable, microprocessor controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10A. It uses the Kelvin-type, four-terminals measurement principle, thus eliminating errors caused by lead and contact resistances.
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Millohm & LCR
Help prevent failures in motor windings, generators and transformers with a quick and easy resistance test using an Amprobe milliohm meter. To efficiently inspect and verify electronic components for quality control, choose an Amprobe LCR tester.
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Motor Winding Ohmmeter
RMO-M Series
The motor/generator winding resistance test is used to identify open windings, shorts between two windings, short to grounds, connection mistakes or shorted turns. This non-invasive test of winding resistance helps to pinpoint problems regarding windings in stator or rotor part of an electrical machine. Additionally, motor winding ohmmeter has the capability of performing heat run test which will show a change in windings resistance with an increase of temperature.The RMO-M series is designed as an ideal aid in preventive maintenance of electrical motors and generators. They are powerful (up to 100A of test current), portable (8 kg) and generate DC current which is completely ripple-free. This makes measurement very precise with 0,1% accuracy.Three voltage channels make measurement very easy since it is possible to obtain a value of all three winding resistances in one measurement
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Transformer Winding Resistance Meters
TWA Standard Series
The TWA standard series instruments are designed to measure the resistance of six coils and simultaneously analyze the three-phase tap changer on load of the primary and secondary transformer coils (provided by model TWA40). This is done in a single cable configuration, with test currents up to 40A. Each transformer configuration has a special measurement algorithm that is optimized for rapid stabilization of test results. The TWA instruments generate a true DC current without ripple. Both current injection and magnetic circuit energy discharge are automatically regulated.
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Highly Inductive Resistance Meter
MR 8050
With the MR 8050 resistances highly inductive Resistance Meters windings of transformers, motors and reactors can be measured. (range 100 µΩ with 0.01µΩ resolution up to 6 kΩ). The performance of the test objects can be up to 800 MVA or even more. The magnetic loading of a transformer is performed quickly using a high loading voltage (60V). This is important for time critical measurements (cooling curves). The unloading of the transformers core is very fast, very safe, as the energy is total destroyed in the MR 8050.
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UNI-T Series
Weshine Electric Manufacturing Co., Ltd
mainly used to measure the wire resistance of cables, the contact resistance ofswitches, connectors, relays, the resistance of coils, motors, transformer windings, and equipment enclosures, lightning protection belts, ground beams, structures, cabinets, steel bars, Test the connection resistance between metal components of water pipes, windows, guardrails, radiators, assembly lines, etc. It is widely used in telecommunications, electric power, meteorology, computer rooms, oil fields, power distribution lines, tower transmission lines, gas stations, factory grounding grids, lightning rods, etc.
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10 A portable digital micro-ohmmeter
MPK-253
The MPK-253 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10 A.
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Transformer Winding Resistance Meters
Vanguard Instruments Company, Inc.
The TRM-40 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-40 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.
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Motor Starting & Control Resistors
Motor Starting Resistors are used to reduce the voltage at the motor terminals and also decrease the starting current. Motor Starting Resistors are necessary because the self resistance of a motor armature is very low. When the voltage is first applied, excessive current will flow. For limiting this current, since there will be no resisting back electromotive force (emf),some series resistance can be added to the armature windings.
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Three-Phase Transformer Winding Resistance Meters
TWA Advanced Series
TWA Advanced series is the latest DV Power solution for three-phase transformer winding resistance measurement and tap changer analysis. They are capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetization. It has the option of the automated test mode, where the instrument operates the tap changer without operator input (minimizing the risk of human error) and records winding resistance results based on pre-selected stabilization criteria.The unique DVtest method of tap changer analysis enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, together with the measurement of tap changer motor current which detects motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or simultaneously on three phases. It can also be performed together with the winding resistance test in all tap positions.A unique advantage of TWA Advanced instruments is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer connected in a YN configuration. This can significantly speed up the testing– for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.TWA500 is equipped with a large 10.1” graphical touch-screen display, while TWA400 has a 7” graphical touch-screen display. Besides making the interface much more user-friendly compared to older winding ohmmeters, it also enables certain test options that were previously available only with DV-Win software. The most important among them are DVtest, tap changer motor current measurement, “Heat Run” test, test templates, and automatic test mode.
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Micro and Milliohmmeter
AD-7110
The instrument AD-7110 is designed to measure, with high accuracy, resistance conductive elements of power devices: motor windings, transformer windings, conductor rails, inspecting the electrical conductivity of screw connections, crimp, welded state of the contacts of switches and relays current up to 100 A .
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Digital Electrical Network Analyzer
1826 NA
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Measures Earth Resistance without the need for poles in the ground or external measuring wires.● Earth measurement uses the real earth current path and the current generated by the electric network, without the need for any disconnection.● The Earth Resistance displayed is exactly the earth resistance that the earth current will need to go through if an earth fault occurs. No need to add all the bonding points and connection paths resistances.● Displays voltage supply at the transformer (Line to Neutral), without loading the transformer. Displays voltage between Line (Phase) and Earth (Ground), without drawing any current.● Measures the impedance of the line itself so you can analyze and differentiate between the multiples paths of the wiring.● Measures the Neutral Impedance. Single one smart push button operation; ON, Test, Scroll trough results and menus.● Checks wiring integrity (LEDs).● Auto off/auto ranging (software ranging). ● Combined prospective short circuit current, loop, individual wire and Earth Tester.● Voltage test L-N and L-E.● Loop test for L-E and L-N and PSC.● Enables analysis of constituent components in L-E and L-N loops giving resistance of earth, neutral wire, live wire and transformer winding.● Display can be customized for large orders.
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1 A DIGITAL MILIOHMMETER
MO-2Ke
The MO-2Ke digital low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of contacts, switches, transformer and motor windings, etc., using test currents from 1 mA up to 1 A.It uses the Kelvin-type (4-terminals) measurement principle, thus eliminating errors caused by lead and contact resistances.Resistance readings are shown in the alphanumeric display with up to a 4 digit-resolution. It allows to measure resistances of up to 2 kO, with resolution of 0.01 mO.Measurements accuracy is guaranteed by the state-of-the-art system for signal-amplification, offset-free and with long-term stability.
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Single-Phase Transformer Winding Resistance Meters
RMO-TW Series
RMO-TW series is perfect for winding resistance measurements of inductive objects. It is ideal for testing transformer windings (power transformers, distribution, autotransformers) and for on-load tap changer verification. In addition, any RMO-TW transformer ohmmeter & tap changer analyzer can also perform transformer demagnetization.The series contains 4 models, with maximal test currents from 10 A (RMO10TW) to 50 A (RMO50TW). They are fitted in a portable and lightweight metal housing.All transformer ohmmeters from RMO-TW series generate a true DC ripple-free current with automatically regulated measurement and discharging circuit. The injection of current and discharge of energy from the test object are automatically regulated.Three independent channels enable testing of three windings in series. Consequently, this enables measurements of winding resistance in every tap position of an on-load tap changer without discharging between the tests.DV-Win software enables control and observation of the test process, as well as saving and analyzing the results on a PC. It provides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. Additionally, DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation. The software can also perform the calculations necessary for the “Heat Run” test. Finally, a user can export all results in the form of a report.
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Automatic Three Phase Transformer Ratio Meter
ATRM PLUS
*Fully Automatic measurement.*Wide selection of Excitation Voltages of 10V, 40V, 100V, 230V & 250V from front panel.*4V Excitation voltage provided for CT measurements*Ratio range of up to 5000; direct display of measured ratio.*No conversions required.*Automatic Jumper selecting as per the vector*Diagram of Transformer.*Automatic testing of all 3 phases in 3 phase transformers*Without manual intervention.*Displays % deviation from a nominal ratio.*External storage facility using pen drive.*Internal storage up to 10000 readings.*Touch screen 7” Color TFT display with backlighting with*Resolution of 800 X 480.*Tap changer facility.*Computer interface using RS-232 or USB.*Windows Interface software provided for data transfer.*USB printer interface.*Four terminal measurements to reduce errors due to*Winding and lead resistance.*Auto print and storage facility.Fast measurements.
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Fully Automatic Transformer Winding Resistance Tester
Measure DC resistance of transformers windings etc. Introduction: The NMC ''TDR'' is a high precision, new generation, light weight large output current and micro-processor controlled tester. This replaces old DC wheat stone bridge and double arm bridge for measurement of DC resistance. ''TDR'' adopts new advanced test current power supply technology, four terminal measurement, digital display of resistance value and test current. ''TDR'' is powered by 220V AC mains single phase supply. The measurements are accurate as the test current is highly stable. High automation is achieved with automatic discharge warning.Principle: The constant current generated is fed to the resistance under test through the current terminals and the voltage drop across the resistance under test is measured and displayed in ohms. A true four terminal measurement is used to eliminate the need for lead resistance compensation.
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Current Transformer Tester
HTCT-300
Full-featured, can not only satisfy various CT (eg: protection, measurement and TP category) but also PT type electromagnetic unit for its excitation characteristics (ie voltage current characteristics), ratio, polarity, secondary winding resistance, secondary load, ratio deviation, angle deviation and other test requirements.
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Megohm Meter
Digital Megohm Meter, model SMG5, is a compact standalone meter designed for checking HVAC compressor insulation. The SMG5 provides a 1000V voltage source, monitors current, and displays the resistance between the test points. Maximum current output is <1mA. It can be used to determine the condition of insulation from winding to ground in a motor, compressor, or transformer. Includes a case, alligator clip lead tip and leads with removable tips.
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Transformer Winding Resistance Tester
KRI 9310
KRI 9310 adopt Kelvin four-wire testing method, which effectively eliminates the influence of the resistance of the test line on the test results. It can be able to increases the current to 10A by which can test extremely low resistance to 0.01 Ω(such as amorphous alloy, Copper-nickel, nickel-chromium-iron, iron-chromium-aluminum etc). For the tested objects with high resistance value (CT/PT), the instrument can extend the range to 20 kΩ，so the wide resistance test range enables KRI9310 can cover 80% of the power transformer products on the market and switchgear bus-bar cable etc. The power of the tester use the built-in rechargeable lithium battery that can test hundreds of transformers by one time charging.
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Relaying Current Transformer Analyser
*Measures Ratio, Excitation Characteristics, Polarity, Winding Resistance, Remanance, and Insulation Resistance of secondary winding. * Determines Composite Error. * Used to test un-mounted CTs or CTs that are mounted but isolated inside the power system equipment. * Conducts a whole series of tests automatically, thus speeding up the time to commission CTs and relaying systems. * Battery powered test set - light weight & fully portable. * Provides a graphical presentation of the CT excitation characteristics. * Determines the IEC 10/50 knee point and the point of maximum permeability, ANSI 45 degree Slope Point. * Detects shorted turns or insulation problems within the test CT, thus avoiding commissioning of faulty equipment.
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Micro-Ohmmeters
Micro-Ohmmeter is an affordable 7 range, 4-Wire Kelvin based product that is used to test electrical resistance on a wide variety of applications including winding resistance, contact resistance, and component testing. The 720A micro-ohmmeter has an autorange feature (available with NSN package) and is compatible with an RS232C interface (OP-232). Thanks to its wide-range capabilities, ease of use, and CE mark, this micro-ohmmeter is used commonly across the globe.
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Microohmmeter
MMR-6700
The MMR-6700 digital meter is designed for measuring low resistances with a stabilised current of up to 200 A. The use of test clamps enables the safe measurement of breakers (high-, medium- and lowvoltage), isolators and other components earthed on both sides. The MMR-6700 series meters are equipped with a unique module in their class that measures inductive components which have a current of up to 10 A, enabling the winding resistance of motors, transformers and other inductive components to be measured. Another useful function is the temperature measurement and the automatic compensation of results with relation to the measured temperature or temperature set by the user. The system is completed with a recorder function. Special measuring algorithms and additional functions allow an appropriate measuring method to be chosen depending on the measured component and measurement conditions, thus, widening the application areas of the meter. The state-of-the-art user interface, various communication interfaces, wireless communication and communication with the computer, printer, 2D code reader are integrals features which enable full, comfortable and intuitive management of not only measurements and their results but also ID data of measured components.
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Digital LOOP/PSC/LOAD Tester
2811 LP
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Displays and sound warning if external voltage present.● Displays mains voltage, scroll trough menus.● Checks wiring integrity (LEDs and display).● Single button operation.● Auto-off/auto-ranging.● Combined prospective short circuit current, PSC and LOOP tester.● Built-in carry case, test leads in separate pouch.● Loop test for L-E and L-N and PSC.● Voltage test L-N and L-E.● Enables analysis of constituent components in L-E and L-N loops giving resistance of earth, neutral wire, live wire and transformer winding.● Display can be customized for special orders.● 60Hz available on request.
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Switch Module
STCS
The external module STCS allows performing automatically the following PT tests: ratio per tap; winding resistance; OLTC dynamic test. The connection to the transformer under test, to STS and to the measurement taps is performed just once; then, all transformer tests are performed without interruptions.
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DC Resistance Tester
GDZRS-20A
GDZRS series Winding DC resistance tester is optimal designed for measuring three phase winding DC resistance of big capacity transformer. It can test three phase winding DC resistances at the same time
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Digital Micro OHM Meter
NMC's Digital Micro Ohm Meters are low cost, compact, light weight, 3½ digit resistance meter suitable for measurements of resistances of cables, wires, transformers, motor windings, coils and contact resistance of switches, connectors, relays and track resistance of PCB's etc. The value of resistance is displayed on 7 segment LED display. Four terminal measurement systems provide measurements free from errors due to contact resistance and test lead resistance.
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Electrical Measurements Test
The tests are performed to measure and collect data from electrical and electronic parts using various measurement methods including, but not limited, to the following: capacitance, resistance, winding resistance, insulation resistance, magnetic permeability, power input, and quality factor Q.
