Abstract: A test device is configured for testing a specimen which has an inductor. The test device includes a controllable unit for reducing a current intensity of a current flowing in the inductor.

Abstract: A switch apparatus (10) for a measuring device (30) for a transformer includes controllable switch device (14) which are configured to short-circuit respectively assigned terminals (11) of one of a plurality of windings of the transformer. A test apparatus (40) including the switch apparatus (10) and a method (50) for operating the switch apparatus (10) are also disclosed. With apparatuses (10, 40) and methods (50) according to the exemplary embodiments, the work effort, time expenditure and errors and inaccuracies can be reduced through an automated testing of transformers.

Abstract: The following steps are performed in order to test a tap changer (20) of a transformer (5; 6) which tap changer is designed to change a transmission ratio of the transformer (5; 6): generating a test signal which is supplied to a winding (1-3; 10) of the transformer (5; 6) and to the tap changer (20). Repeatedly actuating the tap changer (20) in order to change the transmission ratio with each actuation. Determining a curve of an electrical measurement variable (I; I1; I2) of the transformer (5; 6) over time (t) respectively during the step of actuating the tap changer (20) depending on the test signal. automatically illustrating the curves (41, 42) in a temporally-superimposed manner.

Abstract: In order to test substations from different manufacturers and of different types in a simple manner, it is provided that a control unit (6) for a switching device (5) of a substation (4) is connected via an adapter cable (11) to a test device (10), which simulates the switching device (5) for the test and the test device (10) reads configuration-specific data from a memory unit (15) on the adapter cable (11) and the test unit (10) thus configures its signal inputs (BE) and signal outputs (BA, AA) that are required for conducting the test.

Abstract: A contact-making device (10) is used for a resistance measurement on a test object (30). The test object (30) comprises a threaded hole (31), which has an internal thread (32). The contact-making device (10) is designed to be mechanically coupled to the internal thread (32) of the threaded hole (31). The contact-making device (10) comprises a first contact (11) and a second contact (12), in order to make electrical contact with the test object (30) at, at least, two points when the contact-making device (10) is mechanically coupled to the internal thread (32). The first contact (11) and the second contact (12) are electrically insulated from one another by an insulating material (15-17) in the contact-making device (10).

Abstract: The invention relates to a test system and a method to test a circuit breaker (2) of an electrical switchgear assembly. A sub-station battery (3) of the electrical switchgear assembly is used to generate a supply voltage (7) for the circuit breaker (2) for the testing thereof, wherein the sub-station battery (3) is coupled to a test device (1) in order to generate the supply voltage (7) for the circuit breaker (7) [sic] from an input voltage (6) provided by the sub-station battery (3). The supply voltage (7) is stabilized by means of a voltage regulator (11) of the test device (1).

Abstract: In a method, operation of an electric power system which has a power utility automation system (1981-1984, 1991-1994) is monitored. The power utility automation system (1981-1984, 1991-1994) comprises a plurality of intelligent electronic devices (IEDs) (1981-1984, 1991-1994) communicating via a communication network. During operation of the electric power system, properties of the electric power system are monitored, the monitored properties comprising monitored data messages which are transmitted by the plurality of IEDs (1981-1984, 1991-1994) over the communication network. The monitored data messages are evaluated based on configuration information for the power utility automation system (1981-1984, 1991-1994) to detect a critical event. An alert signal is generated in response to detection of the critical event.

Abstract: A method and a system (9) for testing a switching installation (30) for power transmission installations are provided. The switching installation (30) comprises a switch (2) which either connects a first side (6) of the switch (2) to a second side (7) of the switch (2) or disconnects it therefrom, and comprises two earthing switches (10, 11). Each of the two earthing switches (10, 11) is provided to either connect the first side (6) or the second side (7) to earth (1) or to disconnect it from earth (1). To test the switching installation (30), a current is generated through the switch (2) and a magnitude of the current through the switch (2) is determined. In this respect, the two earthing switches (10, 11) are closed while the current is generated and while the magnitude of the current is determined.

Abstract: A testing device for testing a control unit of a switching device of an electrical switchgear installation. The testing device has a signal input, and to which a controlled current sink is provided, which is connected to the signal input. The controlled current sink shunts an input current from the signal input in order to provide a dynamically adjustable input impedance. A method for testing a control unit of a switching device of a switchgear installation, includes the testing device having a signal input, to which an input voltage may be applied. In the testing device, a controlled current sink shuts an input current from the signal input and thus provides a dynamically adjustable input impedance.

Abstract: A mobile transformer test device (10) for testing a power transformer (40) has connectors (12) for the detachable connection of the transformer test device (10) to the power transformer (40). The transformer test device (10) has a source (5) for generating a test signal. The mobile transformer test device (10) has an evaluation circuit (6) for determining, based on the test signal and a test response of the power transformer (40), information regarding a B-H curve (50, 60) of the power transformer (40).

Abstract: A method and test device for testing protection relays, the test device having a signal generator. The signal generator supplies a signal as pulses having pause times, which alternate over time. Signal level is reduced during the pause times and at least one pulse has an amplitude at least higher than one of the preceding pulses. A supply voltage is supplied by an accumulator providing electric energy for generating the pulses. Via the accumulator, a greater mobility and flexibility is ensured, and fuel-fed power units or emergency power units may be omitted. In order to reduce the load (average energy) on the accumulator, the signal generator emits the signal as pulses having pause times. The pulse amplitudes may have an increasing trend to reach a switching threshold. This allows the use of smaller and more compact, which is important for a portable test device.

Abstract: The aim of the invention is to improve the efficiency and handling of a test device (4) for testing a protection relay (2). This is achieved by a method and a test device (4). A signal (S) is generated in a test device (4), and the signal (S) is applied to the protection relay (2). An adaptation device (X) which can be found in the test device (4) is supplied with a supply voltage (Uv) by an accumulator (5), and the adaptation device (X) supplies a signal generator (G) with an intermediate voltage (Ux), said signal generator generating the signal (S). The use of an accumulator (4) allows fuel-supplied power units to be obviated. The use of an adaptation device (X) allows the supply voltage (Uv) of the accumulator (5) to be converted into small intermediate voltages (Ux) and the small currents of the accumulator (5) to be converted into high currents in order to supply the signal generator (G) for example.

Abstract: The present method relates to a method for checking a multi-pole electrical circuit breaker. The multi-pole electrical circuit breaker comprises a plurality of poles (101-103). Each of the plurality of poles (101-103) comprises a first connection (121-123) and a second connection (131-133). Closing the particular pole (101-103) makes it possible to electrically connect the first connection (121-123) of the particular pole (101-103) to the second connection (131-133) of the particular pole (101-103) via the pole. In the method, a plurality of micro-ohm measurements are carried out at the plurality of poles (101-103), while the plurality of poles (101-103) are earthed on both sides in a P-P-P-E configuration. A contact resistance of one of the plurality of poles (101-103) is determined on the basis of the plurality of micro-ohm measurements.

Abstract: In order to demagnetize a transformer core (13, 23) a demagnetization device (40) is detachably connected to a primary side (11) of a transformer (10, 20). An alternating signal is fed to the primary side (11) in order to demagnetize the transformer (10, 20).

Abstract: In order to test substations from different manufacturers and of different types in a simple manner, it is provided that a control unit (6) for a switching device (5) of a substation (4) is connected via an adapter cable (11) to a test device (10), which simulates the switching device (5) for the test and the test device (10) reads configuration-specific data from a memory unit (15) on the adapter cable (11) and the test unit (10) thus configures its signal inputs (BE) and signal outputs (BA, AA) that are required for conducting the test.

Abstract: For testing a traction battery (5) of an electric vehicle (1), which battery is both chargeable and dischargeable via a charging-discharging interface (2), a control command for initiating a discharging process of the traction battery (5) is generated. The discharging process is monitored by a testing apparatus (10). At least one characteristic quantity of the traction battery (5) is determined depending on the monitored discharging process.

Abstract: A switch apparatus (10) for a measuring device (30) for a transformer comprises controllable switch means (14) which are configured to short-circuit respectively assigned terminals (11) of one of a plurality of windings of the transformer. A test apparatus (40) comprising the switch apparatus (10) and a method (50) for operating the switch apparatus (10) are also disclosed. With apparatuses (10, 40) and methods (50) according to the exemplary embodiments of the invention, the work effort, time expenditure and errors and inaccuracies can be reduced through an automated testing of transformers.

Abstract: A transformer testing device (10) comprises outputs (31-33) for detachably connecting the transformer testing device to windings of multiple phases of a transformer (50). The transformer testing device (10) further comprises a plurality of sources (21-23), each of which is designed to generate a test signal. The transformer testing device (10) also comprises a switching matrix (40) that is connected between the plurality of sources (21-23) and the outputs (31-33).

Abstract: A transformer test device (10) for testing a transformer (40) has connections (12) for releasably connecting the transformer test device (10) to the transformer (40). The transformer test device (10) has a source (13) for generating a test signal for testing the transformer (40). The transformer test device (10) has a controllable switching means (15) which is connected to the connections (12) during a transformer test for the purpose of short-circuiting at least one winding (42) of the transformer (40).