Impedance Phase Research Articles

Study the effect of kaolin on the electrical properties of polyvinyl acetate-polyol composite

Polyvinyl acetate and polyol (PVA-Polyol) has been blended in percentage by weight 3:1 and a mixture has been done by mixing different percentages by weight of kaolin for electrical measurements. Diagnosis of kaolin was measured by FTIR spectrophotometer. Quality factor (Q), dissipation factor (D), parallel resistance (R), pseries resistance (R), impedance (Z), series capacitance (C) and parallel capacitance ss(C) and Phase angle (Φ) were measured. The maximum electrical conductivity is pfound 6794 S.m-1 for samples 1, 3wt% kaolin and the minimum electrical conductivity is 1x10-5 S.m-1 for sample (2) 5wt% kaolin. Dielectric constants (έ), dielectric loss (έ′), have been studied and calculated. The frequency dependent ac conductivity (σ) and frequency independent dc conductivity (σ) has studied and acdcinvestigated. The calculated minimum and maximum ac conductivity (σ) is 3.2x10-5 acS.m-1 for samples (3) 6wt % kaolin and 0.45 S.m-1 for sample (2) 5wt % kaolin. The minimum and maximum calculated independent frequency dc conductivity (σ) is -dc 0.3472 S.m-1 for sample (2) 5wt % kaolin and 1.1671 S.m-1 for sample (1) 3wt % kaolin.

The electrochemical corrosion behavior of Sn58Bi-XCr composite solder

In this paper, the corrosion resistance of Sn58Bi-XCr (X = 0, 0.1, 0.2, 0.3 wt%) was investigated, and the electrode reaction process of the corrosion process was analyzed by electrochemical impedance spectroscopy and Tafel linear extrapolation in the strongly polarized region of the kinetic potential polarization curve. The results show that Sn58Bi-0.3Cr has the largest capacitive arc radius and Rp in the Nyquist plot. The most pronounced impedance values and phase angles appear in both the Bode mode diagram and the Bode phase diagram of the Sn58Bi-0.3Cr composite solder, indicating that the Sn58Bi-0.3Cr solder has the best corrosion resistance. Meanwhile, from the Tafel curve fitting results, as the Cr element content increases, the self-corrosion potential moves toward smaller negative values, and the corrosion current density of Sn58Bi-0.3Cr is the smallest, and the corrosion rate is the slowest, indicating the best corrosion resistance.

A New Stability Enhancement Method Using KF Estimation for the PWM-SMC-Based Grid-Tied Inverter Under Weak Grid Condition

A sliding-mode control (SMC) technology is widely used in inductor-capacitor-inductor (LCL)-filtered grid-tied inverters (GTIs) due to its strong robustness against parameter drift. However, under weak grid conditions, the steady performance of GTI using conventional pulsewidth-modulation-based SMC (PWM-SMC) degrades, resulting in increased harmonics in grid-injected currents. One reason is that the voltage feedforward term at the point of common coupling (PCC) in the SMC loop causes the phase margin of the inverter output impedance to decrease. Another reason is that the gain of conventional PWM-SMC-based systems is not high enough, especially under weak grid conditions. This article proposes a PCC feedforward voltage reconstruction method (named KF-PWM-SMC) for a PWM-SMC-based controller using Kalman filter (KF) estimation. As a result, the phase and magnitude of the inverter output impedance at the desired frequency can be significantly improved. Moreover, the proposed PCC feedforward voltage extraction method can save the PCC voltage control sensor, thereby improving the reliability of the whole system. A 3-kW experimental GTI based on the dSPACE DS1202 platform has been developed to verify the feasibility of the proposed control strategy.

A distributed compensating strategy for power systems pre-protection against disruptive contingencies using heterogeneous FACTS devices

The responsive and effective pre-protective actions are vital to the resilience of electrical power systems. This paper addresses the online pre-protection problem of power systems subject to disruptive disturbances caused by contingencies. A novel distributed optimization algorithm for flexible alternate current transmission systems (FACTS) devices is proposed to adjust the branch impedance and voltage phase angle with the aid of thyristor-controlled series compensation (TCSC) and thyristor-controlled phase shifting transformer (TCPST), which enables to regulate power flow and eliminate the disruptions caused by bus overloads and transmission line faults. Moreover, theoretical analysis is conducted to guarantee the convergence of numerical algorithm for solving the distributed optimization problem. Finally, numerical simulations are carried out to validate the proposed optimization algorithm on IEEE 9 bus system, and a performance index is proposed to better compare control effects with existing centralized control algorithm. • Create a novel network model for power grids to decouple the physical layer and cyber layer. • Develop a distributed optimization algorithm by integrating FACTS devices for the real-time protection of power systems. • Provide rigorous theoretical analysis for the distributed optimization algorithm with guaranteed convergence.

Improved Weak Grids Synchronization Unit for Passivity Enhancement of Grid-Connected Inverter

The weak grids may be unstable due to the negative resistance behavior of the grid-connected inverter (GCI) caused by the synchronization unit with the phase-locked loop (PLL). This article proposes a passivity enhancement method to attain the positive output resistance of GCI in the qq channel. Initially, the impedance decomposition is utilized to reveal the reason for the negative output resistance brought by PLL. Secondly, with decomposed impedance, a novel PLL by adding a prefilter and an impedance phase regulator with a normalized amplitude to the input of traditional synchronous reference frame PLL (SRF-PLL) is proposed. Afterward, the effect of the critical system parameters and GCI operating conditions on the GCI’s passivity is discussed based on the established small-signal impedance model. Theoretical analysis manifests that the proposed PLL does not affect the system’s stability under rectifier mode and brings the passivity of GCI’s output impedance in the qq channel in broad system parameters under inverter mode. Lastly, the experiments are implemented, verifying that using the proposed PLL, the instability caused by the intersection between grid and GCI impedances is removed due to the passivity, and the system can operate at 1.0 per unit (pu) active power reference under the very-weak-grid conditions.

Intraoperative Assessment of High-Risk Thyroid Nodules Based on Electrical Impedance Measurements: A Feasibility Study.

Precise diagnosis of thyroid nodules is challenging due to non-diagnostic/inconclusive results and uncertainties about the malignancy of follicular neoplasms (FNs), even in frozen-section pathology. Therefore, surgical management, especially in Bethesda III and IV categories, may be complicated, and sometimes a second surgery may be required. The Thyroid Nodule Impedance Measurement System (TN-IMS) consists of a metallic patch attached to submental skin and a G20 I.V. cannula inserted into the targeted nodules. Two impedance-based parameters named Z1kHz and impedance phase slope (IPS) in 100 kHz to 500 kHz of the thyroid nodules are recorded and compared with their histopathological results as the gold standard. TN-IMS was intra-surgically applied to 103 human thyroid nodules and normal thyroid tissues. A remarkable consistency between defined co-ranges of Z1kHz/IPS and the histopathological status of specimens was achieved (p < 0.001). Based on these measurements, it was concluded that intraoperative bioelectrical impedance scanning of thyroid nodules would be a helpful complementary approach to detecting high-risk excision-required thyroid nodules.

A Detection Method for Crop Fungal Spores Based on Microfluidic Separation Enrichment and AC Impedance Characteristics.

The timely monitoring of airborne crop fungal spores is important for maintaining food security. In this study, a method based on microfluidic separation and enrichment and AC impedance characteristics was proposed to detect spores of fungal pathogens that cause diseases on crops. Firstly, a microfluidic chip with tertiary structure was designed for the direct separation and enrichment of Ustilaginoidea virens spores, Magnaporthe grisea spores, and Aspergillus niger spores from the air. Then, the impedance characteristics of fungal spores were measured by impedance analyzer in the enrichment area of a microfluidic chip. The impedance characteristics of fungal spores were analyzed, and four impedance characteristics were extracted: absolute value of impedance (abs), real part of impedance (real), imaginary part of impedance (imag), and impedance phase (phase). Finally, based on the impedance characteristics of extracted fungal spores, K-proximity (KNN), random forest (RF), and support vector machine (SVM) classification models were established to classify the three fungal spores. The results showed that the microfluidic chip designed in this study could well collect the spores of three fungal diseases, and the collection rate was up to 97. The average accuracy of KNN model, RF model, and SVM model for the detection of three disease spores was 93.33, 96.44 and 97.78, respectively. The F1-Score of KNN model, RF model, and SVM model was 90, 94.65, and 96.18, respectively. The accuracy, precision, recall, and F1-Score of the SVM model were all the highest, at 97.78, 96.67, 96.69, and 96.18, respectively. Therefore, the detection method of crop fungal spores based on microfluidic separation, enrichment, and impedance characteristics proposed in this study can be used for the detection of airborne crop fungal spores, providing a basis for the subsequent detection of crop fungal spores.

Basic Study on Measurement of Return Loss and Smith Chart Change Using Microstrip Patch Antenna with Concentration Transition for Non-invasive Blood Glucose Measurement.

This paper describes a basic study on the measurement of return loss and change in Smith chart using a microstrip patch antenna (MPA) with concentration transition to perform non-invasive blood glucose measurements. To evaluate blood glucose level changes in the human body, the concentration of measurements was changed 10 times to an equivalent of 100mg/dL in a range of 0-1000mg/dL to reflect a concentration of 400mg/dL, which is the fatal level of diabetes. Five types of MPAs were fabricated that formed resonant frequencies in the 1, 2, 3, 4, and 5GHz bands, and were used in the experiment. Each MPA constituted a sharp narrow band characteristic and induced a large change in return loss. By measuring the return loss and Smith chart to evaluate the concentration change at resonant frequencies, the return loss was observed to change by an average of 0.058 dB for every 100mg/dL change, and the impedance magnitudes and phase angles analyzed through the Smith chart were observed to have a certain tendency, which confirmed that they were changed. This study shows that for performing non-invasive measurements of blood sugar level, measuring the change in return loss can provide a more stable and reliable measurement compared to the two methods that are simultaneously used to view the samples.

The Effect of Varying Current on the Impedance Phase Characteristics of CoFeSiB Amorphous Ribbon

The impedance magnitude characteristics of the giant magnetoimpedance (GMI) sensors have been extensively researched since the magnetoimpedance (MI) effect was discovered 20 years ago. However, unlike earlier impedance amplitude studies, the current study shows that the characteristic shift of the GMI impedance phase is more sensitive to the change in the magnetic field. CoFeSiB exhibits excellent GMI effect and soft magnetic characteristics. The impedance phase characteristics of an amorphous ribbon of CoFeSiB are examined in this work in relation to fluctuations in the excitation current. The impedance phase characteristics are significantly influenced by the magnitude and frequency of the ac excitation current as well as the degree to which the dc current overlapped the ac current. When the dc bias current is zero, the sensitivity in the weak field is roughly 0.79%/Oe. The sensitivity can reach up to 3.97%/Oe in the same field when the dc bias current is set to 20 mA. The GMI phase sensitivity change rate has seen a further increase of almost 402.5%. It indicates that the appropriate excitation current amplitude and frequency can excite the maximum impedance phase change.

Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy

AbstractThis study covers composite production and characterization of powders obtained by applying the electroless Ni coating technique to Fe–Co powders by microwave sintering technique. The physical, mechanical, and electrical properties of electroless Ni-coated Fe and Co composites samples produced in different compositions by sintering magnetic materials in a microwave oven at 1,100°C were characterized. With the electroless coating technique, a uniform nickel deposit on the Fe–Co particles was coated before sintering with the precipitation procedure. A composite consisting of metallic phase, Fe–Co, and triple additions in a Ni matrix was prepared in an argon atmosphere and sintered by microwave technique. X-ray diffraction, scanning electron microscope, and impedance phase analyzer were used to obtain structural data in the temperature range of 25–40°C and to determine magnetic and electrical properties such as dielectric and conductivity. The ferromagnetic resonance was varied between 10 Hz and 1 GHz, and measurements were made to characterize the properties of the samples. Numerical findings obtained for 25% Ni composition at 1,100°C (Fe–37.5% Co) suggest that the best conductivity and hardness are obtained by adding 25Ni at 1,100°C sintering temperature.

A Closed-Loop Water Management Methodology for PEM Fuel Cell System Based on Impedance Information Feedback

Water management is an important issue for proton exchange membrane fuel cells (PEMFC). The research mainly focuses on the diagnosis and treatment of faults. However, faults harm PEMFC and cause its durability decay, whatever duration they last. This study designs a closed-loop water management system to control the water content in a reasonable range which can not only avoid the faults of hydration and flooding but also improve the performance and durability of PEMFC. The proposed system introduces the measurement methodology based on the phase of single-frequency impedance, which corresponds numerically well with the water content. Moreover, two preferred operating conditions, cathode air stoichiometry and stack temperature, are adopted to regulate the water content with a trade-off between the time cost and power loss. The open-loop characteristics of water content on the temperature and air stoichiometry are studied to design the corresponding control strategy. Findings suggest that air stoichiometry is suitable for large regulation requirements of water content, while the temperature is suitable to meet small demands. Finally, the proposed closed-loop water management system is validated by experiments in variable-load and constant-load with disturbance situations. The results indicate that the proposed system effectively controls the water content within a 3% deviation from the desired value.

Relating Surface Topography to Impedance Behavior in Solder Mask Coated Circuit Boards

To manufacture circuit boards, thin film metallic patterns are first designed and deposited onto FR4 substrates to form the circuit electrodes, followed by a subsequent deposition of a solder mask coat to better insulate the electrodes and prevent cross talking between them. Because this manufacturing process can deposit multiple circuits on the same board, it is often assumed that all circuits on the same electrical circuit board are identical and exhibit similar electrical responses. However, the electrical response of circuit boards is a multi-variate function of solder mask heterogeneity, exposure conditions, humidity, type of manufacturing technique, and sample surface topography among other factors. In this paper, identical circuits on the same solder mask coated board demonstrate a “dual” behavior response in its impedance response; a “high impedance” response and a “low impedance” response as seen in Fig. 1. Although this “high” or “low” behavior can be characterized by the impedance magnitude, the impedance phase angle also provides a means to distinguish the dual behavior responses measured. To gain better insight into the factors that drive the resulting impedance behavior measured, circuit topography was characterized to tie surface roughness parameters to electrical measurements. 3D surface profiling was done on five interdigitated circuits containing 25 pairs of electrodes each. All circuits examined were located on the same board and received no exposure treatment to isolate only the relationship between surface topography and impedance behavior. Each circuit examined showed three distinct regions classified by surface height. The tallest region corresponded to the positive electrode, the second tallest region to the negative electrode, and the lowest region to the solder mask. For each region measured on each interdigitated circuit, the surface roughness parameters were calculated using the Keyence VK-X3000 software and then averaged to represent the overall topography of the respective regions. The impedance measurements were then analyzed in the context of the respective region average height profiles and surface roughness parameters for each circuit to find relationships between surface roughness and electrical behavior. This paper introduces a new approach to understanding impedance behavior of solder mask coated circuit boards with respect to the circuit topography and roughness parameters. Figure 1

A closed-chest model of selective atrial myocardial infarction for the study of induced electrophysiological and structural derangements

Abstract Background The diagnosis of atrial infarction is often masked by the frequent association with ventricular infarction. For this reason, the electrophysiological and structural consequences of selective atrial ischemia are poorly understood. Purpose The objective of this study was to analyze the alterations in the ECG, local electrograms, and multifrequential atrial myocardial impedance in a new experimental model of acute and chronic atrial infarction. Methods Seven anesthetized pigs were subjected to 4h of atrial ischemia induced by selective catheter occlusion of the atrial coronary branches originating in the left circumflex coronary artery. The surface ECG was recorded and the changes in P-wave morphology analyzed. Four weeks later the animals were subjected to endocardial voltage mapping (Carto) and multifrequential impedance. The hearts were processed for anatomopathological study. Results Selective occlusion of the coronary atrial branches induced atrial infarction with fibrosis in the left atrium in 6 of the 7 cases (Figure). The surface ECG showed prolongation of the P-wave duration (Figure) (P-wave in lead II: from 72±8ms at baseline vs. 97±18ms at 4 weeks, ANOVA p<0.01; P-wave in lead aVR: from 71±3ms at baseline vs 87±9ms at 4 weeks, ANOVA p<0.01) with no appreciable displacement of the PR segment. Endocardial mapping of the left atrium showed low-voltage bipolar zones with decreased multi-frequency impedance phase angle values, as compared with preserved zones of the same atrium (bipolar electrograms: from 0.6±1mV to 2.0±1.9mV, T-Test p<0.01; Phase angle at 300KHz: from −5.5±2° to −9.0±4.4° T-Test p<0.05). Conclusion We developed a closed-chest swine model of selective atrial infarction suitable for the study of ECG patterns and electrophysiological mechanisms linked to atrial myocardial ischemia and infarction. The structural derangements are detectable by endocardial mapping of local voltage electrograms and local tissue impedance. Funding Acknowledgement Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Supported by grants from ISCI-MINECO (FIS PI17/00069), FEDER, CIBERCV (CB16/11/00276)

Equivalent circuit of a dielectric in a wide frequency range (0 Hz – 500 MHz)

Based on the measured impedance of the dielectrics an equivalent high frequency (0 Hz - 500 MHz) circuit model was built. The equivalent circuit model was built taking into account the physical processes occurring in the dielectric. The attempt explaining why the frequency characteristics (modulus and phase) of the dielectric complex impedance have such a character in a wide frequency band (up to 500 MHz) was made. It was shown that for constructing an equivalent circuit model (structure and parameters), measuring only the dielectrics resistance modulus is not enough. It is also necessary to measure the phase of the dielectric complex resistance, which is ignored in many works on the synthesis of an e dielectric equivalent circuit.

From pollution to wealth: Soot-graphene hybrid structure as supercapacitor electrode for high-performance alternating current filtering

Efficiently employing air pollution substances as functional materials cannot only realize recycling environmental wastes into wealth, but also alleviate the air pollution and respiratory disease problems. Herein, we report a soot-graphene hybrid structure as supercapacitor electrode materials for achieving good alternating current (AC) filtering performances. Soot particles, which cause environmental pollution, can be readily renewable from daily combustion wastes with abundant natural resources, enabling fast electrolyte-ion migration on their surface. Graphene can be grown from either methane or renewable peanut oil to reduce interfacial resistance between soot and current collector, assisting in making the most of structural advantages of soot. The synergistic effect offers supercapacitor with good frequency-response ability and AC filtering performances in both aqueous and organic electrolytes: high impedance phase angle of −80.7° and high energy density of 509 μF V2 cm−2 at 120 Hz, short RC time constant of 0.213 ms, excellent electrochemical stability, as well as a good ability for filtering AC signals with different waveforms into direct current signals. This study offers a sustainable strategy to recycle environmental pollution into value-added electrode materials for high-performance AC filtering supercapacitors, which displays promising potential in eco-friendly and cost-effective development of small-volume AC filters for miniaturized electronics.

A Multimodal Modulation Scheme for Electric Vehicles’ Wireless Power Transfer Systems, Based on Secondary Impedance

This study aimed to investigate a multimodal modulation scheme that takes into account the wide range of output characteristics, numerous constraints, and complex working conditions in the wireless charging of electric vehicles. Key electrical parameters and variables in the secondary stages of electric vehicle wireless power transfer (EV-WPT) systems were evaluated based on capacitive, inductive, and resistive impedance working modes. The limiting duty cycle values, D, of the rectifier were derived by detecting the mutual inductance, M. This multimodal modulation was adopted, based on the secondary equivalent impedance phase, to control the impedance working condition and, hence, achieve optimal working performance. The proposed method can modulate the system performance before and during wireless transmission. The proposed control scheme was verified using a 10 kW EV-WPT experimental prototype under a capacitive impedance working mode with 8.5 kW power output. Our proposed method achieved full power output by modulating the impedance working conditions.

Swallowing Events Recognition Method Based on Complex Impedance Pharyngography and Nyquist Plots

Early screening is of great significance to reduce the incidence of dysphagia, and accurate recognition of swallowing events (SEs) becomes an inevitable step during the screening and treatment of dysphagia. Impedance pharyngography (IPG) has been developed as a promising noninvasive SE detection method in the last 20 years, but the conventional IPG technique can only measure impedance amplitude and misses the equally important phase information. To further improve the analysis capability of the IPG technique, this article proposes a new complex IPG (CIPG) detection method, which can dynamically extract the complex impedance (impedance amplitude and phase) information during the swallowing process. First, the CIPG measurement principle based on integer-period digital lock-in amplifier (IP-DLIA) is proposed, and an FPGA-based CIPG system is built. Then, an intelligent algorithm for SE recognition is designed in which the Nyquist plots (impedance real part versus imaginary part) are adopted as 2-D-image inputs of the residual nets convolutional neural network (CNN) algorithm. Finally, an SE recognition experiment is performed, in which different SEs, including dry swallowing, drinking water, drinking yogurt, eating bread, and coughing, are recorded using the CIPG system. The results show that the overall SE recognition accuracy reaches 97.8%, which is much higher than those based on the traditional IPG method or other sensors. This study demonstrates the effectiveness and superiority of the proposed CIPG technology and the intelligent SE recognition algorithm and lays theoretical and technical foundations on further developing an early screening method for dysphagia based on CIPG.

Effect of sulfate-reducing bacteria from salt scale of water flooding pipeline on corrosion behavior of X80 steel

As a means to enhance the recovery of oil reservoirs, waterflooding is widely employed in field development. However, because injected water contains solid impurities and incompatible characteristics, water injection pipelines often suffer from scaling and blocking. In addition, because these pipelines are typically buried in underground soil, microbial bacteria are derived from humid and oxygen-deficient environments, causing serious microbial corrosion on the basis of scaling corrosion. The objective of this study was to analyze the corrosion behavior under the combined effect of sulfate-reducing bacteria (SRB) and the scale layer (CaCO3) induced inside a water injection pipeline. With an X80 steel pipeline as the experimental material and an oilfield injected water simulation solution as the experimental medium, this study conducted weight-loss tests and electrochemical experiments. Combined with the experimental results, scanning electron microscopy, electrochemical impedance spectroscopy, element and phase analyses, and 3D corrosion morphology reconstruction technology were used to explore the changes and mechanism of corrosion behavior under the combined effect of CaCO3 scale layer and SRB in water injection pipelines used in oilfields. The study results showed that a nonuniformly distributed CaCO3 scale layer can provide sites for SRB metabolic activity and also serve as a channel for the exchange of corrosion ions. The corrosion rate of the water injection pipeline increased significantly under the combined effect of the CaCO3 scale layer and SRB, and pitting corrosion under the biofilm/scale layer was serious. In the presence of iron oxides, SRB could interact with CaCO3, causing microbial dissimilation and reduction of iron oxides, forming a loose FeS product film, and accelerating the corrosion process of steel pipelines.

Mechanical Characterization of Anchor under Uniaxial Compression Loading Conditions

Bolt reinforcement technology plays an important role in supporting the construction of many engineering fields, and the uniaxial loading characteristics and behavior tests of anchors have great significance to the research and application of anchors. Therefore, four anchor specimens GA ∼ GD were fabricated and tested to explore the macro and microbehavior characteristics of anchors under uniaxial compression. The stress-strain curves for GA ∼ GC specimens under uniaxial compression were analyzed. The stress-strain curve, elastic strain and creep strain, the failure results, and electrochemical impedance spectroscopy of specimen GD under multistage loading were investigated. The results showed a series of behavior characteristics of anchor under uniaxial compression. Under uniaxial compression, the shapes of stress-strain curves of three specimens GA ∼ GC were similar, and they had experienced four different stages from stage I to stage IV, respectively. After calculating the uniaxial compressive strength of the three specimens, the average uniaxial compressive strength of these specimens was σ c ¯ = 8.31 MPa. The stress-strain curve of the specimen GD was obtained by a multi-stage loading test. The total strain of the specimen consisted of elastic strain and creep strain. In the whole process of loading, the proportion of elastic strain was greater than that of creep strain, and the proportion range of elastic strain was 51.90% ∼ 55.82%. Seven electrochemical impedance spectrum curves of the specimen GD under multi-stage compression load were obtained. The dispersion and concentration of Nyquist curves were affected by different loading levels; the higher the loading level, the more dispersed the Nyquist curve is. In the measured Bode diagram, compared with the previous six measurements, the variation laws of impedance value and phase angle measured at the seventh time in the failure stage of the specimen were quite different. The above research and conclusions can provide some reference for the test theory and engineering application of anchors.

Modern geoelectromagnetic researches of the Ukrainian Carpathians

Based on the results of modern synchronous geoelectromagnetic studies, a spatiotemporal picture of the distribution of geomagnetic variations and the electric field on the Earth’s surface, as well as an idea of the distribution of electrical conductivity and the geoelectric structure of the subsurface section of the southwestern Ukrainian Carpathians, was obtained. The experimental data were processed using the PRC_MTMV software package; the properties of response functions — tippers for periods of geomagnetic variations from 50 to 5000 s and curves of apparent electrical resistivity (amplitude values and impedance phases) from 10 to 1000 s were analyzed. The anomalies of electrical conductivity in the Earth’s crust outlined as a result of a qualitative interpretation correspond to fault tectonics and create a chain of four local differently oriented sections, the common axis of which runs between the Transcarpathian and Chernogolovsky deep faults, and in the southern part between the latter and Uzhotsky (it is also possible to consider the option of a single longitudinally heterogeneous conductive structure within the concept of the axial zone of the Carpathian magnetovariational anomaly). An inhomogeneous distribution of electrical conductivity at the depths of the upper mantle was recorded in the Ukrainian Carpathian region from the Transcarpathian trough to the Skibov cover. It is shown that there is a general northeastern deepening of the upper edge from 40—60 km (Transcarpathian trough) to 90—100 km (Krosnensky cover) and its sharp subsidence in the zone of the Porkuletsky and Duklyansky covers. Three sections were distinguished along the strike of the inner and central zones of the Outer Carpathians: the northern one is characterized by a deepening of the upper edge and a branching of electrical conductivity along the depth towards the south; The obtained results of geoelectromagnetic studies are in good agreement with geothermal zoning, correspond to the structure of the lithosphere according to the DSS profiles and with ideas about the geodynamic development of the interior.