Modernization of the Complex Type Ik-1u for Measuring the Impedance of the Grounding Device of a Lightning Arrester and Supports of Transmission Lines

Abstract

The creation of a measuring device for determining the impedance of the grounding of lightning arresters and supports of overhead lines under the influence of aperiodic pulses with the parameters 1.2/50 μs, 8/20 μs and 10/350 μs. Methodology. For this purpose, electrical engineering theory, transient modeling software and natural modeling methods are used. Results. The parameters of the electrical circuits of the additional forming unit were determined to create lightning current pulses with parameters of 10/350 μs using the IK-1U measuring complex. According to the simulation results, a layout of the forming unit in the form of an attachment and the IK-1U complex with the upgraded power supply system were created. Oscillograms of the front and pulse duration are obtained. The specified model was tested when performing electromagnetic diagnostics of the state of the RFP for more than 100 operating electrical substations. Originality. The measuring complex IK-1U was improved, which made it possible to determine the impulse impedance of the grounding device of lightning arresters when exposed to a current of 10/350 μs, 8/20 μs and of voltages 1.2/50 μs. Practical value. Upgraded device allows measurements in accordance with modern international requirements. References 9, tables 1, figures 3.

ANALYSIS OF CHARACTERISTICS AND POSSIBILITIES OF HIGH-VOLTAGE COMPLEX SCIENTIFIC-&-RESEARCH PLANNING-&-DESIGN INSTITUTE «MOLNIYA» OF NTU «KHPI» FOR THE TESTS OF OBJECTS OF ENERGY, ARMAMENT, AVIATION AND SPACE-ROCKET TECHNIQUE ON ELECTRIC SAFETY AND EMC

“…In the world there are a number of devices that allow to determine the pulse resistance of the GD. A detailed analysis of existing portable devices for this purpose is presented in [37], among which there are Polish WG-407, WG-507 and MRU-200, Japanese PET-7, ZED-meter manufactured in the USA, Ukrainian IK-1U and Russian impedance meter. It should be noted that only three of these devices allow measurements to be made when simulating the impact on power objects of lightning voltage (current) pulses, namely: WG-507 with a voltage (current) pulse of 4/10 μs, MRU-200 with voltage pulses (current) 4/10 μs and 10/350 μs, and IK-1U with voltage pulses (current) of a temporary shape of 1.2/50 μs and 8/20 μs.…”

“…In this regard, the staff of the Scientific-&-Research Planning-&-Design Institute «Molniya» of NTU «KhPI» improved the existing measuring complex of the type IK-1U due to «stretching» the duration of the required current pulse 10/350 μs in the mode of generating a current pulse 8/20 μs with a decrease in its amplitude [37]. This was achieved by developing a new forming unit and expanding the measuring range of a pulse voltmeter.…”

“…Based on the results of the simulation, a mock-up of the forming unit for the new device was created in the form of a set-top box to the existing IK-1U complex. Figure 30 shows oscillograms of the front and duration of a thundering aperiodic current pulse of 10/350 μs obtained in IK-1U [37]. a b Fig.…”

“…30. Oscillograms of the front of the current pulse (a) and its duration (b) in the mode of formation of the temporary shape 10/350 μs by the modernized IK-1U complex [37] Table 9 shows the main technical characteristics of the advanced measuring complex IK-1U with a new forming unit. After modernization, the IK-1U electrical installation allows the electrical diagnostics of the GD and PTL supports to be performed using three temporary shapes of voltage (current) pulses (1.2/50 μs, 8/20 μs and 10/350 μs), which significantly distinguishes it from foreign analogues [37] .…”

“…Oscillograms of the front of the current pulse (a) and its duration (b) in the mode of formation of the temporary shape 10/350 μs by the modernized IK-1U complex [37] Table 9 shows the main technical characteristics of the advanced measuring complex IK-1U with a new forming unit. After modernization, the IK-1U electrical installation allows the electrical diagnostics of the GD and PTL supports to be performed using three temporary shapes of voltage (current) pulses (1.2/50 μs, 8/20 μs and 10/350 μs), which significantly distinguishes it from foreign analogues [37] . Table 9 Technical characteristics of the complex IK-1U [37] Parameter name Value Fronts of voltage and current pulses (at levels of 0.1-0.9 from its amplitude), μs The modernized complex IK-1U successfully passed testing when performing electromagnetic diagnostics of the state of the GDs at more than 100 operating electrical substations in Ukraine.…”