Abstract: A system for testing a transformer includes a voltage source configured to apply an input voltage to a secondary winding of the transformer, the input voltage is configured to induce a voltage in a primary winding of the transformer. A primary voltmeter is configured to measure the induced voltage in the primary winding, a plurality of secondary voltmeters configured to measure voltage in a plurality of secondary windings of the transformer, and one or more phase angle meters to simultaneously measure a plurality of phase angles between the primary voltage and each of the plurality of secondary voltages. A controller is connected to the voltage source, the primary voltmeter, the plurality of secondary voltmeters, and the one or more phase angle meters, the controller is configured to calculate a plurality of winding ratios based on the voltage and phase angle measurements, the controller is also configured to identify all secondary taps.

Abstract: A system for ground fault detection includes an alternating current (AC) excitation source configured to provide an AC test signal to a circuit under test; a current transformer configured to detect a current of the AC test signal; a capacitive pickup configured to detect a voltage of the AC test signal; and a receiver which includes a display; and a processor configured to receive the voltage from the capacitive pickup; receive the current from the current transformer; and display on the display one or more components of the current.

Abstract: A turns ratio meter may be connected to each phase of each set of windings. The excitation voltage used in testing is a DC square wave. The excitation voltage is relatively low, between 1 and 48 volts. The step down and step up testing is performed several times with different voltages and/or frequencies. Excitation losses of the transformer are determined based upon the multiple step down and step up tests. The step down and step up testing can be performed without reconfiguring the test leads on the transformer. The testing is performed on a single phase of the transformer or all three phases of the transformer simultaneously. The turns ratio of the transformer is accurately determined using the results of the step down and step up testing and the calculated excitation losses.

Abstract: A test paddle is provided that includes a body portion having a first end and a second end. The test paddle includes a plurality of adapters provided about the second end and a plurality of contacts provided about the first end, each of the plurality of adapters electrically coupled to one of the plurality of contacts. The test paddle includes a removable insulation plate selectively attached to the body portion. A method for testing relays is also provided.

Abstract: A method for magnetic/impedance burst testing of large electric motors to determine broken rotor bar defect. The method providing a portable tester and includes a Signal Processor, a single-phase power source VAC, an AC/DC boost converter connected to the power source, at least one energy storage device connected to the AC to DC boost converter, a Pulse Width Modulated drive module (PWM) connected to the at least one energy storage device, and a series of at least three switches (IPM) using switch/level boost-type PWM rectification. The burst test is repeated until a full rotation of magnetic angles are tested and recorded with the Signal Processor. Rotor impedance versus magnetic angle of the full rotation is verified in order to check for failure, and broken rotor bar defect is determined when a shift in measured stator's impedance/admittance level for any of the given magnetic angles is identified by the Signal Processor.

Abstract: A tester for testing a transformer is provided. The tester comprises a primary voltmeter and a plurality of secondary voltmeters. The tester may also comprise an ammeter in series with a voltage source configured to apply voltage to the transformer. The primary voltmeter is configured to measure voltage induced across a primary winding of the transformer, while the secondary voltmeters may simultaneously measure voltage outputs at secondary windings of the transformer. The tester is configured to calculate ratios, saturation curves, and knee points for multiple winding combinations based on the measurements simultaneously obtained by the ammeter and the primary and secondary voltmeters.

Abstract: A system for magnetic/impedance burst testing of large electric motors to determine broken rotor bar defect. The system being a portable tester and includes a Signal Processor, a single-phase power source VAC, an AC/DC boost converter connected to the power source, at least one energy storage device connected to the AC to DC boost converter, a Pulse Width Modulated drive module (PWM) connected to the at least one energy storage device, and a series of at least three switches (IPM) using switch/level boost-type PWM rectification. The burst test is repeated until a full rotation of magnetic angles are tested and recorded with the Signal Processor. Rotor impedance versus magnetic angle of the full rotation is verified in order to check for failure, and broken rotor bar defect is determined when a shift in measured stator's impedance/admittance level for any of the given magnetic angles is identified by the Signal Processor.

Abstract: A method for magnetic/impedance burst testing of large electric motors to determine broken rotor bar defect. The method providing a portable tester and includes a Signal Processor, a single-phase power source VAC, an AC/DC boost converter connected to the power source, at least one energy storage device connected to the AC to DC boost converter, a Pulse Width Modulated drive module (PWM) connected to the at least one energy storage device, and a series of at least three switches (IPM) using switch/level boost-type PWM rectification. The burst test is repeated until a full rotation of magnetic angles are tested and recorded with the Signal Processor. Rotor impedance versus magnetic angle of the full rotation is verified in order to check for failure, and broken rotor bar defect is determined when a shift in measured stator's impedance/admittance level for any of the given magnetic angles is identified by the Signal Processor.

Abstract: A partial discharge detection board includes a voltage divider configured to attenuate a voltage of a reflected signal. A buffer is connected to the voltage divider. The buffer attenuates frequencies of the reflected signal that are greater than an upper cutoff frequency. An analog-to-digital converter is connected to the buffer. The analog-to-digital converter receives portions of the reflected signal up to the upper cutoff frequency, and the analog-to-digital converter converts the reflected signal from an analog domain to a digital domain. A filter is connected to the analog-to-digital converter. The filter attenuates frequencies of the reflected signal that are less than a lower cutoff frequency. A comparator is connected to the filter. The comparator compares the voltage of the reflected signal to a reference voltage. A counter is connected to the comparator. The counter increments when the voltage of the reflected signal is greater than the reference voltage.

Abstract: A method of testing an insulation system is disclosed. The method comprises coupling a first test lead to a first conductor, the first conductor at least partly isolated by the insulation system and coupling a second test lead to a second conductor or a ground. The method further comprises applying a test signal to the first test lead, receiving a test response from the second test lead, and analyzing the test response from the second test lead to determine a harmonic content of the test response. The method further comprises, when the harmonic content is equal to or greater than a predetermined threshold, determining that the insulator system has non-linear properties.

Abstract: A testing device is provided. The testing device comprises a processor and a switching AC to AC power converter that has no DC link. The processor is configured to set a plurality of bi-directional switches in the power converter in a configuration of on/off states that cause a substantially set electric current to flow through a component being tested by the testing device.

Abstract: A tester for testing a transformer is provided. The tester comprises a primary voltmeter and a plurality of secondary voltmeters. The tester may also comprise an ammeter in series with a voltage source configured to apply voltage to the transformer. The primary voltmeter is configured to measure voltage induced across a primary winding of the transformer, while the secondary voltmeters may simultaneously measure voltage outputs at secondary windings of the transformer. The tester is configured to calculate ratios, saturation curves, and knee points for multiple winding combinations based on the measurements simultaneously obtained by the ammeter and the primary and secondary voltmeters.

Abstract: A tester for testing a transformer is provided. The tester comprises a primary voltmeter and a plurality of secondary voltmeters. The tester may also comprise an ammeter in series with a voltage source configured to apply voltage to the transformer. The primary voltmeter is configured to measure voltage induced across a primary winding of the transformer, while the secondary voltmeters may simultaneously measure voltage outputs at secondary windings of the transformer. The tester is configured to calculate ratios, saturation curves, and knee points for multiple winding combinations based on the measurements simultaneously obtained by the ammeter and the primary and secondary voltmeters.

Abstract: A method of testing an insulation system is disclosed. The method comprises coupling a first test lead to a first conductor, the first conductor at least partly isolated by the insulation system and coupling a second test lead to a second conductor or a ground. The method further comprises applying a test signal to the first test lead, receiving a test response from the second test lead, and analyzing the test response from the second test lead to determine a harmonic content of the test response. The method further comprises, when the harmonic content is equal to or greater than a predetermined threshold, determining that the insulator system has non-linear properties.

Abstract: A tester for testing a transformer is provided. The tester comprises a primary voltmeter and a plurality of secondary voltmeters. The tester may also comprise an ammeter in series with a voltage source configured to apply voltage to the transformer. The primary voltmeter is configured to measure voltage induced across a primary winding of the transformer, while the secondary voltmeters may simultaneously measure voltage outputs at secondary windings of the transformer. The tester is configured to calculate ratios, saturation curves, and knee points for multiple winding combinations based on the measurements simultaneously obtained by the ammeter and the primary and secondary voltmeters.

Abstract: A system and method of testing a power system component is disclosed. The system and method comprises coupling a test set to the power system component and stimulating the power system component with a frequency sweep signal. The method also comprises capturing a response of the power system component to the frequency sweep signal, wherein the response relates to frequency and mapping the response to an estimated response, wherein the estimated response relates to temperature. The method also comprises evaluating the power system component based on the estimated response.

Abstract: A method of testing a power system component is disclosed. The method includes coupling a test set to the power system component and displaying a test form on a display integral with the test set. The method also comprises inputting at least a first test control parameter into the test form using an interface integral with the test set. The method also comprises stimulating the power system component using the test set to produce a first response of the power system component, wherein the stimulating is performed based at least in part on the first test control parameter. The method also comprises displaying a first test result in the test form on the display, wherein the first test result is based on the first response.

Abstract: A test device is provided. The test device comprises a motion-sensing joystick and a pliable, substantially impermeable membrane coupled to the test device such that the joystick is sealed from at least one environmental contaminant.

Abstract: A method of testing an insulation system is disclosed. The method comprises coupling a first test lead to a first conductor, the first conductor at least partly isolated by the insulation system and coupling a second test lead to a second conductor or a ground. The method further comprises applying a test signal to the first test lead, receiving a test response from the second test lead, and analyzing the test response from the second test lead to determine a harmonic content of the test response. The method further comprises, when the harmonic content is equal to or greater than a predetermined threshold, determining that the insulator system has non-linear properties.

Abstract: An upgradeable test set is that includes a stimulator circuit to transmit test signals to an electrical equipment under test, a coupling to removeably couple at least the stimulator circuit to one of a plurality of front-end interfaces. The plurality of front-end interfaces include a first front-end interface having a first display and a first input device and a second front-end interface having a second display and a second input device. The first display and the second display have different display characteristics, and the first input device and the second input device have different characteristics. The one of the front-end interfaces communicates a test control parameter to the stimulator circuit and a response of the electrical equipment under test is communicated to the one of the front-end interfaces. The case is configured to enclose the stimulator circuit, the one of the front-end interfaces, and the coupling.