76 results about "Ground impedance" patented technology

The invention discloses an insulation resistance and capacitance measuring circuit and method based on monopulse double-edge analysis, and relates to the related field of the electrical insulation online monitoring technology, and the circuit comprises a detected object and an insulation detection circuit. The insulation detection circuit comprises a controlled pulse voltage source, a coupling resistance network, a current sensor, a switch control module, a signal modulation circuit and a processor. The measurement method implemented based on the circuit comprises the following steps: injecting a common-mode voltage pulse into a transmission line of the power transmission system by adopting a pulse transmitter; pulse current response is collected in real time, a current oscillogram is drawn, and a three-point sampling method is introduced to record a current value for insulation impedance parameter calculation; according to a load condition, a double-edge verification method is applied based on a pulse current attenuation characteristic, and insulation impedance parameters including a resistive component and a capacitive component are independently calculated by analyzing a pulse current rising edge and a pulse current falling edge. According to the invention, non-intrusive synchronous monitoring of resistive and capacitive components of line-to-ground impedance is realized, and the detection precision is improved.

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention relates to the field of power systems, in particular to a power cable cross interconnection grounding system live-line maintenance method and system. The method comprises the following steps: firstly, synchronously acquiring cable line load current, three-phase grounding ring current and grounding resistance at the head end and the tail end of a metal sheath of a crossed interconnection unit with ring current abnormity, and generating a real-time data set with a timestamp; extracting cable structure parameters based on a preset cable topology database, and dynamically associating the cable structure parameters with the real-time data set; constructing a multi-conductor transmission line equation model, calculating a theoretical circulation distribution value of each section of sheath, and generating a theoretical circulation map; carrying out matching analysis on the theoretical circulation map and actually measured circulation data, and determining defect types and positions; and finally, according to a defect positioning result, the maintenance operation is executed in an electrified state through the insulating mechanical arm, and the stability of the grounding impedance of the system is maintained through the bypass grounding device. The problems that in the prior art, the live detection function is incomplete, and defects cannot be rapidly and accurately positioned are solved.

The invention belongs to the technical field of electromagnetic detection, and relates to an electromagnetic detection multi-level current emission system for a plateau environment and a control method. The control method comprises the steps of calculating load model impedance; analyzing an MFPWM control process, and determining an optimal control parameter by using an optimization target of transmitting spectrum intensity maximization; and MFPWM optimization control: realizing directional power distribution and independent regulation and control of each frequency component by adjusting the frequency and amplitude of each modulation signal component. A multi-level topological structure is adopted, high output voltage is achieved while switching voltage stress is reduced, and the problems that cost rises and system complexity is too high due to the fact that a traditional H-bridge inverter depends on high power supply voltage are solved; by matching with multi-frequency pulse width modulation optimization control, spectrum energy can be flexibly configured, high-frequency components of transmitted signals are enhanced, and the spectrum energy utilization rate and the signal-to-noise ratio are improved; grounding impedance changes in a high dynamic range can be accurately tracked, and the requirements of deep geological electromagnetic detection in an extreme environment are met.

The invention relates to the technical field of electric data testing, in particular to a data calibration system based on an electric power acquisition terminal, which comprises the steps of acquiring a partial discharge signal; the method comprises the following steps: connecting to a grounding network of an open substation, and injecting calibration signals with preset characteristics into spatial distribution nodes of the grounding network; a calibration signal is controlled, a distributed calibration reference is established by comparing measurement results of different terminals on signals from different calibration nodes, and a gradient calibration parameter distribution strategy is established according to the relation between the distance between the electric power acquisition terminal and each calibration node and the grounding impedance; based on the detection data of the same partial discharge source by at least two power acquisition terminals, calculating the spatial position of the discharge source through the signal arrival time difference and the signal attenuation characteristic, and obtaining the measurement accuracy of each power acquisition terminal; and monitoring the long-term evolution trend of the partial discharge signal, identifying the insulation aging state of the equipment, and dynamically adjusting the calibration parameter of the corresponding power acquisition terminal according to the aging state.

The invention provides a control method and system for a flexible arc extinguishing device for a grounding fault of a power distribution network. The flexible arc extinguishing device serves as a controlled zero-sequence source, provides required power for total zero-sequence ground impedance of the power distribution network, supports required zero-sequence voltage of the power distribution network, and promotes grounding fault current and voltage to be zero. By designing the virtual damping and virtual inertia control of the zero axis, the motion characteristics of the rotor of the synchronous generator are simulated, and by designing the virtual excitation control of the zero axis, the excitation characteristics of the stator of the synchronous generator are simulated. When a distributed power electronic flexible arc-extinguishing device in a power distribution network commonly dominates the zero-sequence voltage of a zero-sequence network circuit of the power distribution network, the droop characteristic of a synchronous generator is simulated, and a droop control equation of active and reactive power output by the flexible arc-extinguishing device and the frequency and amplitude of the zero-sequence voltage of the power distribution network is designed; and virtual impedance control is added to coordinate the output of the flexible arc extinguishing device. And finally, constructing a power distribution network ground fault arc extinguishing device control system to realize arc extinguishing of the power distribution network ground fault.

The invention discloses a multi-machine common-bus system grounding fault arc extinction and property identification method based on machine end voltage regulation and control. The method comprises the following steps: S1, machine end arc extinction; s2, low-frequency injection; s3, low-frequency component measurement; s4, grounding transition resistance calculation: through the low-frequency components of the terminal voltage and the current of each generator at the first moment, calculating the ground impedance Zi1 during a grounding fault; calculating the ground impedance Zi2 after the fault is stable through the low-frequency components of the terminal voltage and the current at the second moment; calculating the grounding transition resistance Rgi of each generator when any generator fails by integrating the Zi1 and the Zi2; s5, fault identification: if Rgi is greater than or equal to a set threshold value, identifying the fault as an instantaneous fault, and if Rgi is less than the set threshold value, identifying the fault as a permanent fault; if a generator is identified as a permanent fault, the generator can be identified as a fault unit. According to the method, the problem of poor economical efficiency of existing fault arc extinction and fault identification in a multi-machine common-mother system can be solved.

The invention relates to the field of grounding technology and electrical measurement, and discloses a grounding electrode current diffusion characteristic and environment correlation analysis method, which comprises the following steps: acquiring a ground electricity state vector representing soil electrochemical characteristics; constructing and calibrating a state phase space evolution model for describing time-space evolution of the vector; an adaptive dynamic analysis closed loop is executed, a state vector at the next moment and uncertainty are predicted through the model, an adaptive sensing protocol is generated based on the uncertainty to guide new data collection, a prediction result is corrected through new data, and a corrected state vector is obtained; and finally, based on the continuous corrected state vector, analyzing the causal association between the environment and the state, reconstructing three-dimensional complex conductivity distribution, and determining current diffusion characteristics such as grounding impedance through numerical calculation. According to the method, the limitation of static evaluation in the prior art is solved, and the dynamic prediction of the performance of the grounding system and the physical tracing of the abnormal cause are realized.

The invention discloses a transformer substation electromagnetic interference source modeling and positioning method based on multi-physics field coupling, relates to the technical field of interference positioning, is used for solving the problem of insufficient positioning precision of an electromagnetic interference source, and aims at solving the problem of low positioning precision of the electromagnetic interference source by collecting grounding potential data of a grounding grid monitoring node, calculating a potential deviation index and judging whether discharge abnormality exists or not. And when an abnormality occurs, accessing a historical database to call grounding impedance data of the marked grounding electrode, analyzing an impedance fluctuation trend, detecting a discharge current amount in each discharge direction, marking the grounding electrode by combining a discharge imbalance characteristic, dividing and screening an abnormal corrosion area, and obtaining surface magnetic field data and surface temperature data of each divided area. A discharge concentration coefficient is calculated through magnetic field distribution characteristics and a surface temperature coefficient, a positioning index is generated in combination with discharge path data, a discharge positioning area is screened, and the corrosion positioning precision and maintenance effectiveness of the grounding grid are improved.

This invention discloses a method and system for assessing the grounding resistance status of transmission towers, relating to the field of grounding measurement technology for transmission towers. The method includes: acquiring a grounding impedance characteristic sequence and a three-dimensional environmental characteristic sequence; calculating the comprehensive environmental influence intensity index for each cycle; calculating the response lag coefficient for the current cycle; calculating the dominant weight index of environmental effects for the current cycle; constructing and training two types of hidden Markov models, independent and joint, to obtain the independent observation probability and joint observation probability of each hidden state in the current cycle; based on the independent and joint observation probabilities, obtaining the corrected observation probability of each hidden state in the current cycle; based on the corrected observation probabilities, calculating the confidence level of each hidden state in the current cycle, and determining the grounding resistance status for the current cycle. This invention can dynamically distinguish between normal current dissipation capacity fluctuations caused by the environment and real anomalies caused by equipment degradation, improving the accuracy of grounding status assessment.

The application provides a parallel cavity shared radio frequency power supply system and a radio frequency adjusting method for a plasma process, which comprises the following steps: collecting the ground potential of the cavity wall of each parallel process cavity in real time through a detection and adjusting module, dynamically adjusting the ground impedance of each radio frequency coil, and balancing the total ground impedance of each branch; then, completing independent dynamic impedance matching of each branch by a matching module, eliminating the power distribution imbalance problem caused by the inconsistent impedance of each radio frequency coil, keeping the plasma discharge state of the multiple cavities consistent, improving the process uniformity of each cavity, and greatly reducing the equipment cost by using only one radio frequency power supply.

The invention relates to an alternating current ice melting reactive compensation control method considering ground wire impedance change, which belongs to the technical field of alternating current ice melting, and comprises the following steps: S1, connecting a reactive compensation device into an ice melting loop, and injecting ice melting current into an overhead ground wire through an alternating current power supply; s2, measuring the length and the temperature of the ground wire in the ice melting process through a sag and temperature sensing and monitoring assembly; s3, on the basis of the ground wire impedance change model in the ice melting process, ground wire impedance change is calculated according to the ground wire length and the ground wire temperature; s4, substituting the ground wire impedance value into the heat effect theoretical model, and calculating the required reactive compensation capacity in combination with the temperature rise and the current effective value; and S5, based on the optimal array algorithm, controlling the reactive power compensation device to switch the switching capacitor bank array combination of the corresponding reactive power compensation capacity.

A grounding impedance measurement apparatus and method, and an inverter are provided. The measurement apparatus includes a signal source, a coupling impedance network, a voltage division network, a sampling module, and a controller, the coupling impedance network is connected to the signal source, and couples an excitation signal between a direct-current input terminal and an alternating-current output terminal of an inverter; the voltage division network performs voltage division on the voltage between the direct-current input terminal and the alternating-current output terminal to provide a divided voltage; the sampling module is connected to the voltage division network, samples the divided voltage, and acquires a sampled voltage; and the controller is connected to the signal source and the sampling module, respectively, and acquires a grounding impedance of the direct-current input terminal of the inverter.

The utility model provides a kind of ground impedance detection device based on harmonic analysis, belong to ground impedance detection technical field, including main frame assembly, the inner wall of main frame assembly is connected with ground impedance detector, the outer wall of main frame assembly is fixedly connected with limiting component, the outer wall of main frame assembly is provided with honing component, the outer wall of main frame assembly is provided with side support component, the outer wall of main frame assembly is provided with take-up assembly;The utility model is provided with take-up assembly, in use, by take-up motor driving take-up rod rotation, and then realize the orderly winding of the wire connected with probe or ground electrode test point, avoid multiple wires between each other cross each other, improve the accurate detection of ground impedance detector in field use;By the setting of limiting component, in use, start and control rotary motor use, drive press plate rotation, so that multiple spring barrels are above ground impedance detector.

The invention relates to the technical field of lightning protection grounding lightning rods, and discloses a centering type lightning protection grounding lightning rod for a base station, which is suitable for lightning protection of GNSS base stations and similar communication base stations, and comprises a vertical rod, a lightning rod, an equipotential connecting plate, a GNSS base station, a control box, a vertical grounding body, a lower lead, a bottom lead and a multi-stage supporting, fixing and pressure injection structure, the lightning rod realizes joint equipotential grounding with the base station and the plurality of vertical grounding bodies through the equipotential connecting plate, the coaxial centering layout is adopted, the grounding impedance is effectively reduced, the rapid reinforcement and stabilization of the vertical grounding bodies are realized and the pull-out resistance of the grounding bodies is improved through the supporting and fixing part and drilling and fixing part structures, and the device also integrates the function of pressure injection of a resistance reducing agent, so that the device is convenient to use. The ground effect is further optimized, the aviation obstruction beacon and the solar power supply panel are integrally designed, the visibility of equipment is improved, the ground performance is excellent, the lightning protection safety of the base station can be remarkably improved, and the ground lightning protection device is suitable for the lightning protection ground requirement of a field GNSS (Global Navigation Satellite System) base station.

This application relates to the field of control for safety testing instruments, and discloses a grounding impedance testing circuit and a grounding impedance testing system. The grounding impedance testing circuit includes: a first port, a second port, a suppression module, a detection module, a delay module, a switching module, an output module, and a third port; the suppression module is used to suppress the AC test voltage between the first port and the second port; the detection module is used to detect the circuit state between the first port and the second port, and control the working state of the detection module based on the working state of the switching module and the circuit state detection result; the delay module is used to determine whether to provide a time delay to the switching module based on the working state of the detection module; the switching module is used to detect whether the delay module provides a time delay, and control the working state of the switching module based on the delay detection result; the output module is used to control the output state of the third port based on the working state of the switching module.

The application relates to the technical field of electric data testing, in particular to a data calibration system based on a power collection terminal, which comprises the following steps: collecting partial discharge signals; connecting to a grounding network of an open-type transformer substation, injecting preset characteristic calibration signals at spatial distribution nodes of the grounding network; controlling the calibration signals, establishing a distributed calibration benchmark by comparing the measurement results of different terminals on signals from different calibration nodes, and establishing a gradient calibration parameter distribution strategy according to the distance relationship between the power collection terminal and each calibration node and the grounding impedance relationship; based on the detection data of at least two power collection terminals on the same partial discharge source, calculating the spatial position of the discharge source through a signal arrival time difference and signal attenuation characteristics, and obtaining the measurement accuracy of each power collection terminal; monitoring the long-term evolution trend of the partial discharge signals, identifying the insulation aging state of equipment, and dynamically adjusting the calibration parameters of the corresponding power collection terminal according to the aging state.

A ground monitoring device connectable to the electrical system of an RV, boat or other vehicle or to a remote or shore AC power supply, is configured to monitor the ground impedance by a direct connection to the AC power supply. In one feature, the ground monitoring device can include the capability to disconnect the electrical system of the vehicle from the AC power supply if the impedance exceeds a predetermined threshold.

The present invention discloses a method for selecting a grounding line and confirming a grounding point range in a low-voltage circuit, which relates to the field of power grid protection technology and includes the following steps: obtaining impedance parameters of the circuit power supply, equipment, and cable; connecting impedances in series in the circuit according to the measured parameters to make the three-phase impedances equal; installing a high-frequency current generating module and a grounding capacitor at the end of the circuit; creating a grounding impedance matching table for each device and important node according to the measured impedance parameters; the high-frequency current generating module alternately generates AC and DC currents and measures the neutral point and capacitor currents; and determining the grounding phase and grounding range by calculating the impedance based on the measured values. The present invention installs a high-frequency current generating module and a grounding capacitor at the end of the circuit. The high-frequency current generating module is activated when a fault occurs. During phase selection, each module generates high-frequency current in a sequential cycle, enters the fault phase selection and fault location logic, and can achieve accurate fault location, quickly select the grounded phase, locate the grounding point range, and improve the operational reliability of the low-voltage system.

The invention discloses an intelligent monitoring system for an anti-interference signal decoder, and the system comprises a grounding state monitoring module which is used for detecting grounding impedance in real time and generating an impedance abnormal signal; the multi-source temperature monitoring module is used for synchronously acquiring the chip temperature and the environment temperature; the dynamic compensation control module is used for responding to the impedance abnormal signal to execute the following operations: activating the standby grounding path to reduce the grounding impedance; triggering a graded heat dissipation strategy according to the correlation characteristics of the chip temperature and the environment temperature; the fault traceability module is used for generating a failure root cause analysis report based on the historical change trend of the impedance and the chip temperature; and the decoding bit error rate monitoring unit is used for collecting decoding bit error rate data of the decoder in real time. According to the invention, intelligent monitoring and protection of the anti-interference signal decoder can be better carried out.

The invention discloses an underground comprehensive pipe gallery grounding system model and a grounding system analysis method, when the underground comprehensive pipe gallery grounding system model is laid, cable arrangement is incorporated, the influence of a cable structure on grounding impedance is considered, and the shunting condition of current on the cable in practice is also considered, so that the grounding system model is more accurate and reliable. And the accuracy of grounding impedance calculation is further improved. The excitation current is hit on the cable to simulate that the fault current is firstly transmitted through a cable shielding layer when the cable has a fault and then flows to a grounding grid at each grounding point position, so that the working conditions of different fault grounding points are simulated, and the change characteristics of the grounding impedance when the fault occurs at each position are analyzed and compared; and determining the stability of the system.

A dynamic evaluation method for grounding resistance of a power transmission tower comprises the following steps: designing a frequency-adjustable variable-frequency excitation signal source, and providing a stable alternating current signal to support excitation of different frequencies to a grounding system of the power transmission tower and provide a signal basis for subsequent impedance measurement; a high-precision voltage and current sensor module is built and connected with a frequency conversion signal source, impedance data under different frequencies are collected by measuring voltage and current response of a grounding system in real time, and original data are provided for model building; establishing a frequency response model of the grounding resistance, determining the relationship between the grounding impedance and the excitation frequency through data fitting, and providing a mathematical basis for dynamic evaluation; a dynamic evaluation algorithm is designed, and in combination with a real-time monitoring system, ground resistance change is evaluated in real time, abnormity is detected, early warning is triggered, and stable operation of the system is ensured. According to the invention, high-precision dynamic measurement and real-time evaluation of the grounding resistance are realized, and the stability and reliability of the grounding system under different working conditions are also significantly improved.

The invention discloses a grounding device conduction state degradation trend early warning method and system. The method comprises the following steps: measuring conduction impedance between every two of a plurality of grounding down lead measuring points in a grounding grid according to a preset test path; calculating a grounding impedance value of each grounding down lead measuring point based on the plurality of conduction impedance measured values obtained through measurement; extracting a grounding impedance value of each grounding downlead measuring point according to a time sequence to form a grounding impedance historical data sequence of each measuring point, fitting the sequence to establish a degradation trend model of the grounding impedance along with time, and predicting according to the degradation trend model to obtain a resistance prediction value of each grounding downlead measuring point in future time; and constructing a comprehensive evaluation model based on the resistance predicted value, and outputting a corresponding risk level prompt according to a range in which an evaluation result of the comprehensive evaluation model is located. According to the invention, early and advanced early warning of the latent fault of the grounding device can be realized, and the active safety and economy of power grid operation are improved.

The present application belongs to the technical field of electromagnetic detection, and relates to an electromagnetic detection multi-level current emission system and control method for highland environment. The control method comprises calculating a load model impedance; analyzing an MFPWM control process to determine optimal control parameters for an emission spectrum intensity maximization optimization target; and MFPWM optimization control: by adjusting the frequency and amplitude of each modulation signal component, directional power distribution, independent regulation and control of each frequency component are realized. The present application adopts a multi-level topology structure, which realizes high output voltage while reducing switching voltage stress, avoids the cost increase and high system complexity caused by the dependence of traditional H-bridge inverters on high power supply voltage; in combination with multi-frequency pulse width modulation optimization control, the spectrum energy can be flexibly configured, the high-frequency component of the emission signal is enhanced, and the spectrum energy utilization rate and signal-to-noise ratio are improved; the high dynamic range ground impedance changes can be accurately tracked, and the needs of deep geological electromagnetic detection in extreme environments are met.

The invention provides an electromagnetic interference suppression method in the electrifying process of an electric connector. Comprising the following steps: starting a multi-parameter monitoring module to collect grounding impedance, temperature variation, working frequency and a multi-core crosstalk coupling coefficient when the electric connector works; quantifying the total interference voltage of the electric connector through an interference coupling calculation module based on the acquired grounding impedance, temperature variation, working frequency and multi-core crosstalk coupling coefficient; a self-adaptive offset phase is calculated through a self-adaptive phase offset circuit according to the quantized total interference voltage, and an adjustable inductor is adjusted to realize phase offset of interference; the shielding effectiveness is corrected through the grounding-phase correction shielding layer according to the calculated self-adaptive offset phase and the collected grounding impedance, and the interference suppression stability can be ensured in a high-frequency scene.

The application belongs to the technical field of power grid power supply, and particularly relates to a measurement method and system for tower grounding resistance, which comprises the following steps: constructing a chain linear network model, setting an engineering typical value of the grounding impedance of each tower, constructing a prior admittance matrix, inverting the prior admittance matrix to obtain a prior impedance matrix, injecting a mixed excitation current signal with multiple different frequencies into the grounding lead of the measured tower, synchronously collecting the measured voltage of all nodes, separating the measured voltage under each frequency, calculating an admittance deviation matrix and an impedance deviation matrix, establishing an approximate linear relationship between the impedance deviation matrix and the admittance deviation matrix and a voltage difference vector, solving the approximate linear relationship, obtaining the impedance deviation of the grounding impedance under each frequency relative to the engineering typical value of the grounding impedance, calculating the actual grounding impedance, and separating the actual grounding impedance to obtain the grounding resistance. The application realizes the inversion of the grounding resistance from the external port measurement value without disassembling any grounding lead.

Disclosed are an insulation impedance detection circuit (10), a control method and control apparatus therefor, and a photovoltaic device. The insulation impedance detection circuit (10) is used for detecting a ground impedance of a direct-current bus; the direct-current bus comprises a positive electrode bus (PV+) and negative electrode buses (PV-); the insulation impedance detection circuit (10) comprises sub-detection circuits; the sub-detection circuits each comprise a positive electrode detection resistor (R1) and a negative electrode detection resistor (R2), and are used for detecting bus voltages between the positive electrode bus (PV+) and the negative electrode buses (PV-) by means of the positive electrode detection resistors (R1), and detecting negative ground voltages of the negative electrode buses (PV-) by means of the negative electrode detection resistors (R2); the sub-detection circuits comprise a first sub-detection circuit (102) and a second sub-detection circuit (104); resistance values of the positive electrode detection resistor (R1) and the negative electrode detection resistor (R2) in the first sub-detection circuit (102) are not equal; and resistance values of the positive electrode detection resistor (R1) and the negative electrode detection resistor (R2) in the second sub-detection circuit (104) are equal.

The present invention relates to the field of ground impedance measurement, and in particular, to a grounding test rod and a grounding impedance tester. The grounding test rod comprises a rigid rod and a plurality of conductive parts, all of which are mounted on the rigid rod. The plurality of conductive parts are spaced apart along the length direction of the rigid rod and insulated from each other, and the plurality of conductive parts can be electrically connected to the tester body through a plurality of wires. The grounding impedance tester comprises the above-mentioned grounding test rod. The grounding test rod and the grounding impedance tester provided by the present invention can test the impedance at different depths, and then, can compare the impedances measured at different depths to determine the optimal depth of the grounding body buried underground. The optimal depth can be selected as the depth at which the conductive part corresponding to the minimum impedance measured is located during the test.

The application provides a heavy haul railway rail potential and traction return current determination method, device and equipment, the method comprises the following steps: obtaining the basic parameters of the target heavy haul railway traction power supply system, the per-meter grounding impedance of the bridge and the per-meter grounding impedance of the tunnel; dividing the target heavy haul railway into a roadbed section, a bridge section and a tunnel section; determining the roadbed section impedance matrix, the bridge section impedance matrix and the tunnel section impedance matrix respectively; constructing the voltage equation and the current equation corresponding to the roadbed section, the bridge section and the tunnel section respectively, and determining the rail potential and the traction return current of the target heavy haul railway in combination with the equivalent model of the traction power supply system transformer. Different voltage equations and current equations are constructed for the roadbed section, the bridge section and the tunnel section to determine the rail potential and the traction return current, the topographic information along the heavy haul railway is fully considered, the accuracy and the calculation efficiency of the rail potential and the traction return current can be improved, and the universality is high.