Test system, method, device, medium and product for mine power supply

Abstract

The present disclosure relates to the technical field of testing, in particular to a mine power supply test system, method, device, medium and product. The test system comprises a main power supply bus, a plurality of branch power supply circuits, a mine switch device, a load simulation unit, a fault simulation unit and a protection control unit. One end of each branch power supply circuit is connected to the main power supply bus. The mine switch device is arranged in each branch power supply circuit. The other end of each branch power supply circuit is connected to the load simulation unit through the mine switch device. The fault simulation unit is arranged on the main power supply bus or any branch power supply circuit. The protection control unit is electrically connected to the mine switch device, the main power supply bus and the branch power supply circuit. This can restore the actual mine grid structure, simulate various load states and fault types, and comprehensively analyze the operating characteristics of the system under different operating conditions, thereby improving the comprehensiveness of the test results.

Description

Technical Field

[0001] This disclosure relates to the field of testing technology, and more specifically, to a testing system, method, equipment, medium, and product for mine power supply. Background Technology

[0002] With the continuous increase in coal mining depth and intensity, the capacity of mine electrical equipment is constantly increasing, and the power supply distance is constantly extending. The traditional 6kV power supply method can no longer meet the actual needs of modern mines in terms of power supply capacity, line loss, and system stability. In order to adapt to the power requirements of large fully mechanized mining faces, tunneling faces, and high-power equipment such as ventilation fans, hoists, and air compressors, 10kV high-voltage direct power supply systems are gradually becoming an important development direction for mine power supply.

[0003] In related technologies, the focus is usually on a certain operating state or a certain type of fault, which cannot cover complex scenarios that are common in actual operation, such as voltage fluctuations, power quality changes, and multiple fault superpositions. It is difficult to make a comprehensive assessment of the overall safety and reliability of the system, resulting in insufficient accuracy of test results. Summary of the Invention

[0004] This disclosure is made in view of the above-mentioned problems. This disclosure provides a testing system, method, equipment, medium, and product for mine power supply.

[0005] In a first aspect, embodiments of this disclosure provide a test system for mine power supply, the test system comprising: a main power supply bus, multiple branch power supply circuits, mine switchgear, a load simulation unit, a fault simulation unit, and a protection and control unit; Each branch power supply circuit has one end connected to the main power supply bus, and each branch power supply circuit is equipped with a mining switchgear. The other end of each branch power supply circuit is connected to the load simulation unit through the mining switchgear. The fault simulation unit is set on the main power supply bus or any branch power supply circuit. The protection and control unit is electrically connected to the mining switchgear, the main power supply bus, and the branch power supply circuit respectively.

[0006] In one embodiment of the first aspect, the fault simulation unit includes a short-circuit fault generator and a ground fault generator, which are connected in parallel to the target component; wherein the target component includes a main power supply bus or a branch power supply circuit.

[0007] In one embodiment of the first aspect, the short-circuit fault generator includes three single-phase controllable switches, the output terminals of which are connected in parallel to a common grounding point, and the ground fault generator is connected between the common grounding point and ground.

[0008] In one embodiment of the first aspect, the protection and control unit includes a voltage sampling terminal and a current sampling terminal; the voltage sampling terminal is connected to the main power supply bus and the branch power supply circuit through a voltage transformer, and the current sampling terminal is connected in series to the branch power supply circuit through a current transformer. The primary side of the voltage transformer is connected to the main power supply bus and the branch power supply circuit, and the secondary side of the voltage transformer is connected to the voltage sampling terminal; the primary side of the current transformer is connected in series to the branch power supply circuit, and the secondary side of the current transformer is connected to the current sampling terminal.

[0009] In one embodiment of the first aspect, the load simulation unit includes a resistive load module and an inductive load module connected in parallel. The resistive load module is composed of multiple sets of switching resistors, and the inductive load module is composed of multiple sets of switching reactances.

[0010] In one embodiment of the first aspect, the test system further includes a multiplex power supply unit and a multiplex power supply switching unit; The output of the multi-power supply unit is connected to the input of the multi-power supply switching unit, and the output of the multi-power supply switching unit is connected to the main power supply bus.

[0011] In one embodiment of the first aspect, the test system further includes a data analysis unit, the input of which is communicatively connected to the output of the protection and control unit.

[0012] In a second aspect, embodiments of this disclosure provide a testing method for mine power supply, applied to the aforementioned mine power supply testing system, comprising: Close the corresponding switching devices in each branch power supply circuit to run the load simulation unit.

[0013] The fault simulation unit for control based on operating conditions introduces at least one type of fault.

[0014] From before the fault is introduced to after the fault is cleared, the waveform data of the main power supply bus and each branch power supply circuit are collected by the protection and control unit, and the operating data of the switchgear are recorded.

[0015] The waveform data and runtime data are analyzed to obtain the test results.

[0016] In a third aspect, embodiments of this disclosure provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps in the above-described test method for mine power supply are performed.

[0017] In a fourth aspect, embodiments of this disclosure provide a computer-readable storage medium storing a computer program that, when executed by a processor, performs the steps in the above-described test method for mine power supply.

[0018] In a fifth aspect, embodiments of this disclosure provide a computer program product stored in a storage medium, which is executed by at least one processor to implement the steps in the above-described test method for mine power supply.

[0019] As will be described in detail below, a testing system, method, equipment, medium, and product for mine power supply according to embodiments of this disclosure are provided. In this disclosure, the testing system includes: a main power supply bus, multiple branch power supply circuits, mine switchgear, a load simulation unit, a fault simulation unit, and a protection and control unit. One end of each branch power supply circuit is connected to the main power supply bus, and each branch power supply circuit is equipped with a mine switchgear. The other end of each branch power supply circuit is connected to the load simulation unit via the mine switchgear. The fault simulation unit is located on the main power supply bus or any branch power supply circuit. The protection and control unit is electrically connected to the mine switchgear, the main power supply bus, and the branch power supply circuits. Through the design of the main power supply bus and multiple branch power supply circuits in the above system architecture, the network structure of an actual mine can be realistically reproduced. By accurately simulating various load states and fault types through the placement of the load simulation unit and the fault simulation unit, the authenticity of the test environment is ensured. Furthermore, by recording the operating parameters of each component during the fault occurrence process through the protection and control unit, a comprehensive analysis of the system's operating characteristics under different operating conditions can be performed, thereby improving the comprehensiveness of the test results.

[0020] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0021] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the disclosure and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0022] Figure 1 This is a schematic diagram of a test system for mine power supply according to an embodiment of the present disclosure.

[0023] Figure 2 This is a schematic diagram of a first type of fault simulation unit according to an embodiment of the present disclosure.

[0024] Figure 3 This is a schematic diagram of a second type of fault simulation unit according to an embodiment of the present disclosure.

[0025] Figure 4 This is a schematic diagram of a third type of fault simulation unit according to an embodiment of this disclosure.

[0026] Figure 5 This is a schematic diagram of the fourth type of fault simulation unit according to an embodiment of the present disclosure.

[0027] Figure 6 This is a schematic diagram of the fifth type of fault simulation unit according to an embodiment of the present disclosure.

[0028] Figure 7 This is a flowchart illustrating a testing method for mine power supply according to an embodiment of the present disclosure.

[0029] Figure 8 This is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

[0030] Figure 9 This is a schematic diagram of a computer program product according to an embodiment of the present disclosure. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure more apparent, exemplary embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments of this disclosure. It should be understood that this disclosure is not limited to the exemplary embodiments described herein.

[0032] Research has revealed that with the continuous increase in coal mining depth and intensity, the capacity of mine electrical equipment is constantly increasing, and the power supply distance is continuously extending. Traditional 6kV power supply methods are no longer sufficient to meet the actual needs of modern mines in terms of power supply capacity, line loss, and system stability. To adapt to the power requirements of large fully mechanized mining faces, tunneling faces, and high-power equipment such as ventilation fans, hoists, and air compressors, 10kV high-voltage direct power supply systems are gradually becoming an important development direction for mine power supply.

[0033] Compared with traditional power supply modes, 10kV high-voltage direct supply systems have advantages such as large power supply capacity, long power supply distance, and low voltage loss. However, at the same time, their system structure is more complex, placing higher demands on power quality, fault handling capabilities, and the reliability of protection configurations. In actual mine operating environments, power supply systems not only have to withstand frequent load fluctuations, but may also be affected by power quality issues such as voltage fluctuations, harmonic disturbances, voltage sags, and imbalances. Furthermore, they must cope with various complex fault conditions such as metallic short circuits, grounding faults, and cable damage.

[0034] A failure in a 10kV high-voltage direct power supply system for mining can have a wide-ranging impact and serious consequences, potentially leading to the shutdown of critical production equipment and threatening the safety of personnel and equipment underground. Therefore, conducting a comprehensive and realistic inspection and evaluation of the operating characteristics, protection logic, and fault response capabilities of the high-voltage direct power supply system before commissioning and during operation and maintenance is of significant engineering importance and safety value.

[0035] However, due to the characteristics of high voltage level, complex grid structure and diverse fault types in the 10kV power supply system of mines, how to realistically reproduce the operating topology and working conditions of the mine high-voltage direct power supply network under laboratory or test base conditions, and verify the behavior of the system under different power supply conditions and different fault modes, has become a key problem that urgently needs to be solved in the field of mine power system testing.

[0036] In related technologies, the focus is usually on a certain operating state or a certain type of fault, which cannot cover complex scenarios that are common in actual operation, such as voltage fluctuations, power quality changes, and multiple fault superpositions. It is difficult to make a comprehensive assessment of the overall safety and reliability of the system, resulting in insufficient accuracy of test results.

[0037] To facilitate understanding of this embodiment, a detailed description of a mine power supply testing system disclosed in this disclosure will be provided first, see [link to relevant documentation]. Figure 1 The diagram shown is a schematic of a test system for mine power supply provided in an embodiment of this disclosure. The test system includes: a main power supply bus, multiple branch power supply circuits, mine switchgear, a load simulation unit, a fault simulation unit, and a protection and control unit. Each branch power supply circuit has one end connected to the main power supply bus, and each branch power supply circuit is equipped with a mining switchgear. The other end of each branch power supply circuit is connected to the load simulation unit through the mining switchgear. The fault simulation unit is set on the main power supply bus or any branch power supply circuit. The protection and control unit is electrically connected to the mining switchgear, the main power supply bus, and the branch power supply circuit respectively.

[0038] like Figure 1 As shown, each branch power supply circuit is equipped with a mining switchgear Bk (i.e., Figure 1 The power supply circuits include Bk1-1 to Bk1-6, Bk2-1 to Bk2-5, and Bk3-1 to Bk3-4. Each branch power supply circuit also includes a real cable line segment or a lumped parameter simulated line segment. The load simulation unit includes other load components such as ventilators, air compressors, main hoists, auxiliary hoists, coal mining machines, and tunneling machines.

[0039] In this embodiment of the disclosure, real cables and centralized parameter lines are used in a segmented and mixed manner to balance realism and adjustability.

[0040] Among them, the real cable line section is used for key trunk circuits. It retains the actual cable distribution parameters, insulation characteristics, transient response and high-frequency electrical characteristics to ensure the authenticity of short circuit, grounding and overvoltage tests of the trunk network and closely resemble the actual working conditions on site.

[0041] Lumped parameter simulation of the line segment: Utilizing a modular design with equivalent combinations of resistance, inductance, and capacitance, the line impedance, zero-sequence parameters, and attenuation characteristics are continuously adjustable. Without replacing physical cables, it can quickly simulate lines of different lengths, cross-sections, and aging levels, offering flexible testing and adjustment, and high efficiency in switching operating conditions. The combination of these two technologies ensures the realism of core circuit testing while enabling rapid iteration across multiple parameters and scenarios through the equivalent simulated line.

[0042] The branch power supply circuit can also be equipped with transformer units, such as step-down transformers, to connect power load units, such as low-voltage simulated loads on the ground, low-voltage power in the mine shaft, or power distribution loads at the working face. The branch power supply circuit can also be equipped with capacitor units, such as high-voltage adjustable capacitor units. These high-voltage adjustable capacitor units have compensation currents of 0, 50, 100, and 150A, which can be adjusted adaptively as needed.

[0043] Among them, the compensation current is mainly used to adjust the overall capacitive current to ground of the high-voltage power supply network, control the residual current and arc current of single-phase grounding faults in the system, optimize the zero-sequence voltage level and suppress grounding transient overvoltage, and adapt to the capacitive characteristics of the power grid under different line scales and cable laying conditions.

[0044] The adjustment of the compensation current is directly related to the operating conditions and fault types: Under normal steady-state conditions, the compensation capacity is matched according to the grid connection form, line length, and number of branches; in fault tests such as single-phase grounding and arc grounding, the compensation current is the core control parameter, directly affecting the fault characteristics and protection behavior; in non-grounding fault conditions such as phase-to-phase short circuits, the compensation current can be maintained at the benchmark setting. The compensation current is set in a stepped manner through grouped adjustable capacitor modules. Combined with the combined topology of line segments and physical cables simulated by centralized parameters, the inherent ground capacitance current of the system is first calculated, and then the under-compensation, full compensation, and over-compensation operating modes are flexibly switched by branch switching. The parameters are preset and locked before the test, thereby realizing multi-scenario comparative tests under different capacitance current conditions.

[0045] In addition, the branch power supply circuit can also be equipped with a neutral point transformer, which is connected to the grounding mode switching unit. The grounding mode switching unit is also connected to the arc suppression coil assembly unit and the nonlinear resistance grounding assembly unit. This allows the complete replication of the electrical characteristics of the entire underground power supply chain equipment and lines in the mine.

[0046] Specifically, the transformer unit configuration simulates multi-specification mobile substations and mobile load centers in mines, used to simulate the multi-level transformer power supply structure underground, and to reproduce the actual power supply hierarchy of high-voltage to low-voltage conversion and zoned power distribution. By combining transformers of different capacities and impedance parameters, it simulates the inrush current, load loss, and short-circuit impedance characteristics of transformers in the field, and evaluates the voltage transformation, fault propagation, and protection coordination characteristics of the system under cascaded transformer conditions.

[0047] The lumped-parameter simulation line section uses an equivalent simulation line module combining lumped resistance, inductance, and capacitance to replace real long-distance underground high-voltage cables. It can accurately set line impedance, distributed capacitance, and leakage current parameters, and equivalently simulate the electrical characteristics of cable lines with different tunnel distances, different laying methods, and aging insulation degradation. It solves the problems of inflexible layout and non-adjustable parameters of actual long cables, and enables rapid iterative testing of different cable operating conditions.

[0048] The capacitor unit includes an adjustable capacitive load and a zero-sequence compensation capacitor module. It is mainly used to simulate the long-distance distributed capacitive current of underground high-voltage cables and the capacitive reactive load of the system. At the same time, it can reproduce typical abnormal working conditions such as excessive capacitive current in low-current grounding systems, single-phase grounding arc overvoltage, and reactive power imbalance, and support the testing and verification of grounding protection, overvoltage suppression, and reactive power matching.

[0049] The power load unit encompasses diverse simulated power loads, including fans, air compressors, conveyors, and mining machinery, covering all typical electrical equipment categories in mines. Among them, fans and water pumps represent stable and constant loads; air compressors and crushing equipment represent impactful intermittent loads; and mining face equipment represents randomly fluctuating loads. The coordinated operation of multiple power loads realistically recreates complex mixed load conditions underground, simulating actual power grid disturbances such as load abrupt changes, three-phase imbalance, startup impacts, and harmonic disturbances. This provides realistic load boundary conditions for system stability and protection reliability under different fault conditions.

[0050] Overall, the main power supply bus in this disclosure is used to construct the backbone network structure of the 10kV power supply system for mines; the branch power supply circuits are used to simulate the power supply lines of different mining faces or electrical equipment; the mine switchgear is used to realize the opening and closing control and protection isolation of the circuits; the load simulation unit is used to simulate the load characteristics of actual electrical equipment in the mine; the fault simulation unit is used to introduce various fault conditions during the test; and the protection and control unit is used to monitor the system's operating status and protection actions, and to collect operating parameters such as voltage, current, power, power factor, and frequency of the entire circuit in real time, in addition to protection tripping and alarm outputs; to accurately record the protection action sequence, action value, and fault time information, and to cooperate with the switching of fault devices to complete the monitoring of the entire fault process.

[0051] The modular grid reconfiguration design disclosed herein adopts a segmented busbar, tie circuit, and multi-incoming line redundancy architecture to build a segmented radial power supply topology consistent with the site, which is no longer a single power supply direct connection and can freely combine the trunk, branch, and tie line structures.

[0052] The main busbar is equipped with a mine-use high-voltage incoming switch and bus tie switch, and each branch circuit is equipped with an independent high-voltage outgoing switch, forming a hierarchical isolation protection system of incoming line-busbar-branch-load, which meets the requirements of step-by-step disconnection and fault segment isolation.

[0053] The system is equipped with dedicated fault simulation and load simulation extensions. Fault access interfaces and load coupling interfaces are reserved at key nodes of the backbone network, which can flexibly deploy fault modules such as short circuits and grounding and adjustable load units to meet the fault tolerance, protection coordination and load capacity testing of the backbone network.

[0054] The electrical parameters are fully adjustable and adaptable to the equivalent impedance of the main line, bus parameters, protection settings, and operating logic. All parameters can be configured using a combination of software and hardware to simulate actual working conditions such as different tunnel cable lengths, line impedances, and insulation attenuation of old lines.

[0055] It is worth noting that the test system disclosed herein is not limited to 10kV and has wide voltage adaptability and compatibility: the voltage level can be expanded by replacing the corresponding high-voltage switch, transformer, insulation withstand voltage device, and voltage regulating unit, and it can be compatible with 3.3kV, 6kV and other commonly used medium-voltage power supply levels in coal mines, and adapt to different mining faces and different underground power supply voltage systems.

[0056] This disclosure uses a typical 10kV high-voltage direct power supply system for mining as an example. As a general variation, the hierarchical structure, busbar type, and number of branch circuits of the power supply network can be adjusted according to the actual power supply scheme of different mines. For example, a single busbar structure, a segmented busbar structure, or an equivalent ring network structure can be adopted. Although these variations differ in specific network structure, they can still realistically reproduce the operating topology of the actual mine power supply system, thereby achieving the same purpose of true-type verification and testing.

[0057] Correspondingly, the number or configuration of power supplies can be adjusted according to the test requirements. For example, a single high-voltage power supply can be used with a switching device, or a multi-power supply parallel operation structure can be adopted. The load type, load capacity, or load combination can also be adjusted according to the actual application scenario. For example, the focus can be on simulating heavy-load start-up conditions or light-load operation conditions. Alternatively, a specific type or several types of faults can be selected for verification according to the test objectives. For example, repeated tests can be conducted only on ground faults or short-circuit faults, or the location and duration of the fault can be adjusted.

[0058] The segmented busbars, interconnection control, protection logic, fault simulation, and load simulation architecture of the generalized backbone network are of a general design. Only the primary side withstand voltage and power distribution equipment need to be replaced, and the control, measurement and control, and data acquisition systems do not need to be significantly modified.

[0059] The operating condition simulation is highly versatile. Regardless of the medium voltage level, it can simulate operating conditions such as normal load, short circuit, grounding, voltage abnormality, and three-phase imbalance, and can cover the testing and inspection needs of power supply systems of different voltage levels in non-coal mines and underground mines.

[0060] Furthermore, such as Figure 1 As shown, the mine power supply test system disclosed herein also includes a multi-power supply unit and a multi-power supply switching unit; The output of the multi-power supply unit is connected to the input of the multi-power supply switching unit, and the output of the multi-power supply switching unit is connected to the main power supply bus.

[0061] In this embodiment of the disclosure, the multi-power supply unit is used to simulate different power supplies or different power supply directions in a mine, and the multi-power supply switching unit is used to realize the switching, parallel or independent operation of multiple power supplies.

[0062] The multiple power supply units are configured independently, and each power supply can be switched on and off independently, with its voltage phase, amplitude, and output capacity adjusted independently. They can also be flexibly combined through bus connections and segmented networking.

[0063] Each power source in the multi-power supply unit can be connected to different incoming nodes of the main network and fed to the system from different directions and different power supply paths, simulating the actual layout of multi-circuit incoming lines and multi-point distributed power supply in the mine. By individually controlling the activation, deactivation, grid connection, disconnection, and load distribution of each power source through the control system, different power flow directions can be achieved, such as single-sided unidirectional power supply, double-sided opposing power supply, and multi-end encirclement power supply. It can also be combined with a multi-power source switching unit to manually set the power supply operation mode, change the grid current flow direction, short-circuit current magnitude, and fault propagation path, and completely replicate the electrical characteristics of the underground multi-power source network.

[0064] This disclosure uses multiple power sources. On the one hand, it is to match the actual power supply architecture of mines: large mines in the field generally have dual-circuit, multi-circuit incoming lines, and zoned power supply architectures. A single power source can only simulate the simplest radial single-ended power supply and cannot reproduce the complex power grid structure of the real underground mine. Therefore, the test results are not applicable to engineering.

[0065] On the other hand, in order to realize the main and backup power supply and redundancy switching conditions: based on the design concept of main and backup power supply and mutual backup, multiple power supplies can be set to the main + backup operation mode to simulate the situation where power supply A fails, is under maintenance, or loses voltage, and power supply B can switch to power supply. This is a test item that a single power supply cannot achieve at all.

[0066] like Figure 1 As shown, the multi-power supply unit includes a 10kV power input line and a high-voltage isolation transformer, and has three power supply modes, thereby achieving power supply for different modes through series and parallel connection.

[0067] In this embodiment of the disclosure, a multi-channel power switching unit (i.e., Figure 1 The switching switch is equipped with a dedicated power switching, bus tie parallel, and backup automatic transfer control module to realize automatic switching of dual power supply / multiple power supply, short-term parallel operation, segmented power supply, and simulate the switching operation and main and backup power redundant operation mode in the mine.

[0068] The core function of the multi-power supply switching unit is to switch the overall power supply architecture and operating mode. It enables automatic / manual switching between dual / multiple high-voltage power supplies, segmented power supply, parallel connection of dual power supplies, and mutual backup, simulating the real operation mode of normal switching, load transfer, and redundancy switching of main and backup power supplies in a mine.

[0069] The controlled object performs overall regulation of the upstream power supply line, bus connection, and system power supply path.

[0070] It focuses on operation mode scheduling and power supply reliability simulation; it can achieve smooth switching, short-term paralleling, and segmented isolation; it belongs to the system-level and grid-level operating condition regulation, and serves the topology transformation of the entire test power grid.

[0071] Mining switchgear (circuit terminal switch) is used in various mining branch circuits, load simulation branches, and end power units. It is a local and branch-level switch.

[0072] In an optional implementation, the fault simulation unit includes a short-circuit fault generator and a ground fault generator, which are connected in parallel to the target component; wherein the target component includes a main power supply bus or a branch power supply circuit.

[0073] In this embodiment of the disclosure, Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 These are schematic diagrams of a fault simulation unit proposed in the embodiments of this disclosure. Figure 3 This includes faulty circuits, faulty switches, and resistors; Figure 4 This includes faulty lines, faulty switches, and damaged cables; Figure 5 This includes faulty circuits, faulty switches, rotating electrodes, and arc gaps; Figure 6It includes faulty lines, faulty switches, and nonlinear resistors. The fault simulation unit is used to simulate cable short circuits, grounding faults, or other abnormal operating conditions. There are five different fault types. Under normal operating conditions, the entire device is disconnected and the switching switch is open, completely isolated from the main power supply system, with no fault access. Only when conducting fault tests, through the cooperation of internal dedicated switching switches, fault impedance modules, and control circuits, cable short circuits, grounding faults, and various abnormal power grid operating conditions are accurately simulated.

[0074] The specific implementation method is as follows: The short-circuit fault generator is equipped with an adjustable metallic short-circuit circuit and a current limiting module. It can quickly close the circuit via an electronically controlled switching switch to directly short-circuit the tested busbar and branch cable lines between phases or three phases. It can be set to metallic short circuit or resistor-limited current short circuit according to the test requirements to accurately simulate phase-to-phase and three-phase short-circuit faults such as insulation damage and line splicing in underground cables.

[0075] The grounding fault generator has a built-in adjustable grounding resistance and zero-sequence coupling module. It can be activated as needed by a switching switch to realize various modes such as single-phase metallic grounding, resistive grounding, and transition resistance grounding; and simulate various grounding faults caused by damage to the outer sheath of underground cables, dampness of the line, and aging of insulation.

[0076] Other abnormal operating condition simulations rely on integrated adjustable impedance, load disturbance, and timing control units to simulate atypical electrical anomalies such as three-phase imbalance, phase loss, abnormal line impedance, transient voltage disturbance, and intermittent faults; through timed switching and intermittent switching control, complex field fault scenarios such as intermittent short circuits and instantaneous grounding can be reproduced.

[0077] All fault types are controlled and switched by the system's centralized control or local operation of dedicated fault switching switches, without requiring any changes to the original architecture and wiring of the real power grid system. The fault activation time, duration, and disconnection sequence can be precisely set. In conjunction with protection and control devices and data acquisition systems, the entire process of fault occurrence, development, protection action, and fault disconnection can be fully reproduced, enabling quantitative testing and verification of various fault conditions.

[0078] In an optional implementation, the short-circuit fault generator includes three single-phase controllable switches, the output terminals of which are connected in parallel to a common grounding point, and the ground fault generator is connected between the common grounding point and the ground.

[0079] In this embodiment of the disclosure, the short-circuit fault generator includes three single-phase controllable switches, which are connected in series in the three-phase line to realize single-phase short circuit, two-phase short circuit or three-phase short circuit.

[0080] In an optional implementation, the protection and control unit includes a voltage sampling terminal and a current sampling terminal; the voltage sampling terminal is connected to the main power supply bus and the branch power supply circuit through a voltage transformer, and the current sampling terminal is connected in series to the branch power supply circuit through a current transformer. The primary side of the voltage transformer is connected to the main power supply bus and the branch power supply circuit, and the secondary side of the voltage transformer is connected to the voltage sampling terminal; the primary side of the current transformer is connected in series to the branch power supply circuit, and the secondary side of the current transformer is connected to the current sampling terminal.

[0081] In this embodiment, the primary side of the voltage transformer is connected to the main power supply bus and the branch power supply circuit for collecting voltage signals; the primary side of the current transformer is connected in series in the branch power supply circuit for collecting current signals; the secondary sides of the voltage transformer and the current transformer are connected to the analog input terminal of the microprocessor, and the microprocessor processes the collected signals, that is, the secondary side of the voltage transformer is connected to the voltage sampling terminal and the secondary side of the current transformer is connected to the current sampling terminal.

[0082] In the above embodiments, electrical isolation between the 10kV high-voltage primary line and the protection and control unit is achieved, ensuring testing safety and equipment safety. High-voltage, high-current signals are converted into standard low-voltage, low-current signals, allowing the protection and control unit to use a general-purpose data acquisition module, reducing hardware costs and design complexity. By using current transformers connected in series in each branch circuit, selective monitoring of the current in each branch circuit is achieved, enabling precise location of the faulty branch circuit and verification of the selective operation of the protection device. Furthermore, the electromagnetic coupling of the transformers ensures that the fault transient waveform is transmitted completely and faithfully to the protection and control unit, providing reliable waveform data for fault analysis and protection action timing evaluation, simplifying the hardware structure and improving system reliability and maintainability.

[0083] In an optional implementation, the above-mentioned test system further includes a data analysis unit, the input of which is communicatively connected to the output of the protection and control unit.

[0084] In this embodiment of the disclosure, the data analysis unit is used to centrally store and analyze test data, such as collecting waveform data of the main power supply bus and each branch power supply circuit, and recording the operating data of the switching equipment.

[0085] The waveform data includes instantaneous voltage and current values, which are used to reconstruct the transient process of the fault and determine the fault type and start time. The operational data includes action time, action sequence, switch status, effective voltage and current values, power, power factor, frequency, and fault parameters, which are used to quantitatively evaluate the protection action performance and verify selectivity and reliability.

[0086] Action time can be understood as the time interval from the occurrence of a fault to the completion of the tripping operation by the switching equipment.

[0087] In an optional implementation, the load simulation unit includes a resistive load module and an inductive load module connected in parallel. The resistive load module consists of multiple sets of switching resistors, and the inductive load module consists of multiple sets of switching reactances.

[0088] In this embodiment of the disclosure, before closing the switching devices in each branch power supply circuit, the switching combination of the resistive load module and the inductive load module in the load simulation unit is adjusted to simulate different load conditions.

[0089] When the test is carried out, the parameters of the multi-power supply unit, multi-power switching unit and branch power supply circuit are set according to the configuration requirements of the mine high-voltage power supply system to be tested, and a physical simulation power supply network that is completely consistent with the actual mine power supply architecture is built.

[0090] When the system is in normal operating condition, the main power supply bus provides stable power to each branch circuit. The load simulation unit accurately simulates the actual working status of various mining equipment and underground electrical equipment based on preset operating parameters. The protection and control device collects and monitors the system voltage, current and overall operating parameters in real time throughout the process to assess the stability and power quality of the system under normal operation.

[0091] During fault testing, relying on the fault simulation unit, short circuits, grounding faults, and various abnormal faults can be accurately injected into the main power supply bus or designated branch circuits. Simultaneously, the entire process of fault occurrence, propagation, development, and clearing is recorded, along with changes in electrical data and the actions of protection devices. Data analysis is then conducted based on the protection action sequence, selectivity, and reliability to perform a specialized verification of the entire system's protection configuration and the coordination capabilities of protection systems at all levels.

[0092] During the testing process, by flexibly switching power supply operation modes, adjusting load combination modes, and changing fault simulation types, the mine 10kV high-voltage direct supply system under multiple scenarios, multiple operating conditions, and multiple fault conditions was fully tested and inspected to comprehensively determine the system's overall safety protection capability, operational reliability, and equipment performance.

[0093] Due to differences in geological conditions and mining scale among different mines, their power supply topologies vary significantly. This testing system possesses flexible configuration and adaptation capabilities. By adjusting the number of high-voltage power supplies connected, modifying circuit connection methods, adding or removing branch power supply circuits, and reconstructing the bus topology layout, coupled with the synchronous adaptation and adjustment of power supply logic and protection parameters, it can quickly replicate and build power supply topologies for different mines, meeting the testing and inspection needs of various mine power supply systems.

[0094] The complete testing system disclosed herein relies on integrated control and a dedicated switching device to achieve switching between normal operation and fault testing conditions, rather than simply relying on manual adjustment with a regular switch. The specific switching methods for the two operating conditions and the fault activation methods are as follows: After the test system completes the configuration settings for the network topology, power parameters, power supply mode, and load logic under normal operating conditions, the fault simulation unit is in an exited and locked state. The fault branch switch remains open, and the device is not connected to the power supply circuit. Only the high-voltage power supply unit, power supply bus, branch circuit, load simulation unit, and measurement and control protection device are put into operation. The circuit is normally closed and conducting, and it operates stably under load according to the actual operating logic of the mine, thereby simulating the normal power supply conditions on site.

[0095] Fault testing, including fault condition activation and fault simulation, requires no modification to the main system architecture. The core control relies on a dedicated fault simulation switch: during fault testing, commands are issued by the control system or operated locally to close the fault device switch, flexibly connecting short-circuit, grounding, and other fault simulation modules to the main power supply bus or a designated branch circuit. The timing, type, and duration of fault activation can be precisely controlled, accurately replicating various downhole electrical faults such as instantaneous short circuits, single-phase grounding, and abnormal leakage. After testing, the fault switching switch is disconnected, the fault module is deactivated, and the system returns to normal testing conditions.

[0096] Based on the same inventive concept, this disclosure also provides a test method for mine power supply corresponding to the test system for mine power supply. Since the principle of the device in this disclosure for solving the problem is similar to the above-mentioned test method for mine power supply in this disclosure, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0097] See Figure 7 The diagram shows a flowchart of a testing method for mine power supply provided in an embodiment of this disclosure. Applied to the aforementioned mine power supply testing system, the method includes steps S701-S704, wherein: Step S701: Close the corresponding switching devices in each branch power supply circuit to run the load simulation unit.

[0098] Step S702: Introduce at least one fault type into the control fault simulation unit according to the operating conditions.

[0099] Step S703: From before the fault is introduced to after the fault is cleared, the waveform data of the main power supply bus and each branch power supply circuit are collected through the protection and control unit, and the operating data of the switchgear are recorded.

[0100] Step S704: Analyze the waveform data and running data to obtain the test results.

[0101] In this embodiment of the disclosure, a true simulation test platform for a 10kV high-voltage power supply system for mining is constructed. Under a safe and controllable test environment, the actual power grid and operating conditions are realistically reproduced. The operating characteristics, fault response and protection actions of the power supply system are comprehensively tested, thereby realizing a comprehensive verification of the safety and reliability of the mine high-voltage direct power supply system.

[0102] As can be seen from the above description, the technical solution disclosed herein has the following advantages: (1) It can truly reproduce the actual power supply network structure of the 10kV high-voltage direct supply system for mines. This disclosure constructs a true power supply network with multiple power sources, main power supply bus and multiple branch circuits, so that the test system is highly consistent with the actual 10kV high-voltage direct supply system in terms of structural hierarchy, power supply path and operation topology, avoiding the deviation caused by the simplified model and improving the authenticity and reference value of the test results.

[0103] (2) Comprehensive testing of multiple operating conditions and multiple faults can be carried out under safe and controllable conditions. By setting up load simulation unit and fault simulation unit, this disclosure can safely and controllably simulate different load states, voltage fluctuations and various fault conditions such as short circuit and grounding in the test environment, avoiding the safety risks brought about by directly conducting tests in the actual mine system.

[0104] (3) It can systematically verify the protection action logic and coordination relationship of the mine high-voltage power supply system. By introducing various fault conditions into a real power supply network and recording and analyzing the action sequence, selectivity and reliability of the protection devices, this disclosure can comprehensively examine the coordination between protection devices at all levels in the high-voltage power supply system, which helps to discover potential problems in the protection configuration.

[0105] (4) Achieve comprehensive evaluation of operating characteristics and power quality. This disclosure continuously monitors key parameters such as voltage and current during the test, enabling comprehensive analysis of the power quality, power supply stability and operating characteristics of the system under different operating conditions, rather than being limited to testing a single indicator.

[0106] (5) The test system has strong repeatability and is suitable for multi-stage and multi-purpose testing needs. Since the power supply structure, load parameters and fault conditions of the test system can be preset and repeatedly configured, this solution can repeatedly construct the same test scenario in different test cycles. It is suitable for pre-commissioning inspection, scheme verification and performance evaluation in operation and maintenance phases. It can be extended to mine high-voltage power supply systems of different scales and configurations, and has good versatility and promotion value.

[0107] Corresponding to Figure 7 The present disclosure also provides an electronic device 80, such as a test method for mine power supply, in this embodiment. Figure 8The diagram shown is a structural schematic of an electronic device 80 provided in an embodiment of this disclosure, including: The system includes a processor 81, a memory 82, and a bus 83. The memory 82 stores execution instructions and includes main memory 821 and external memory 822. The main memory 821, also called internal memory, temporarily stores the computational data in the processor 81, as well as data exchanged with external memory such as a hard disk. The processor 81 exchanges data with the external memory 822 through the main memory 821. When the electronic device 80 is running, the processor 81 communicates with the memory 82 through the bus 83, causing the processor 81 to execute the following instructions: Close the corresponding switching devices in each branch power supply circuit to run the load simulation unit.

[0108] The fault simulation unit for control based on operating conditions introduces at least one type of fault.

[0109] From before the fault is introduced to after the fault is cleared, the waveform data of the main power supply bus and each branch power supply circuit are collected by the protection and control unit, and the operating data of the switchgear are recorded.

[0110] The waveform data and runtime data are analyzed to obtain the test results.

[0111] This disclosure also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the mine power supply testing method described in the above-described method embodiments. The storage medium can be a volatile or non-volatile computer-readable storage medium.

[0112] This disclosure also provides a computer program product 90, such as... Figure 9 The diagram shown is a schematic diagram of the structure of a computer program product 90 provided in an embodiment of this disclosure. The computer program product 90 carries a computer program 91. The program included in the computer program 91 can be used to execute the steps of the test method for mine power supply described in the above method embodiment. For details, please refer to the above method embodiment, which will not be repeated here.

[0113] The above description, with reference to the accompanying drawings, outlines a testing system, method, equipment, medium, and product for mine power supply according to embodiments of this disclosure. In this embodiment, the testing system includes: a main power supply bus, multiple branch power supply circuits, mine switchgear, a load simulation unit, a fault simulation unit, and a protection and control unit. One end of each branch power supply circuit is connected to the main power supply bus, and each branch power supply circuit is equipped with a mine switchgear. The other end of each branch power supply circuit is connected to the load simulation unit via the mine switchgear. The fault simulation unit is located on the main power supply bus or any branch power supply circuit. The protection and control unit is electrically connected to the mine switchgear, the main power supply bus, and the branch power supply circuits. Through the design of the main power supply bus and multiple branch power supply circuits in the above system architecture, the network structure of an actual mine can be realistically reproduced. By strategically placing the load simulation unit and the fault simulation unit, various load states and fault types can be accurately simulated, ensuring the realism of the test environment. Furthermore, the protection and control unit records the corresponding operating parameters of each component during the fault occurrence process, thereby enabling a comprehensive analysis of the system's operating characteristics under different operating conditions and improving the comprehensiveness of the test results.

[0114] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0115] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0116] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0117] It should also be noted that in the systems and methods of this disclosure, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0118] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0119] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0120] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A testing system for mine power supply, characterized in that, The testing system includes: a main power supply bus, multiple branch power supply circuits, mining switchgear, a load simulation unit, a fault simulation unit, and a protection and control unit; In this configuration, one end of each branch power supply circuit is connected to the main power supply bus, each branch power supply circuit is equipped with the mining switchgear, the other end of each branch power supply circuit is connected to the load simulation unit through the mining switchgear, the fault simulation unit is located on the main power supply bus or any of the branch power supply circuits, and the protection and control unit is electrically connected to the mining switchgear, the main power supply bus, and the branch power supply circuits respectively.

2. The system according to claim 1, characterized in that, The fault simulation unit includes a short-circuit fault generator and a ground fault generator, which are connected in parallel to the target component; wherein, the target component includes the main power supply bus or the branch power supply circuit.

3. The system according to claim 2, characterized in that, The short-circuit fault generator includes three single-phase controllable switches, the output terminals of the three single-phase controllable switches are connected in parallel to a common grounding point, and the ground fault generator is connected between the common grounding point and the ground.

4. The system according to claim 1, characterized in that, The protection and control unit includes a voltage sampling terminal and a current sampling terminal; the voltage sampling terminal is connected to the main power supply bus and the branch power supply circuit through a voltage transformer, and the current sampling terminal is connected in series to the branch power supply circuit through a current transformer; The primary side of the voltage transformer is connected to the main power supply bus and the branch power supply circuit, and the secondary side of the voltage transformer is connected to the voltage sampling terminal; the primary side of the current transformer is connected in series to the branch power supply circuit, and the secondary side of the current transformer is connected to the current sampling terminal.

5. The system according to claim 1, characterized in that, The load simulation unit includes a resistive load module and an inductive load module connected in parallel. The resistive load module consists of multiple sets of switching resistors, and the inductive load module consists of multiple sets of switching reactances.

6. The system according to claim 1, characterized in that, The test system also includes a multi-power supply unit and a multi-power supply switching unit; The output terminal of the multi-channel power supply unit is connected to the input terminal of the multi-channel power supply switching unit, and the output terminal of the multi-channel power supply switching unit is connected to the main power supply bus.

7. The system according to claim 1, characterized in that, The testing system also includes a data analysis unit, the input of which is communicatively connected to the output of the protection and control unit.

8. A test method for mine power supply, characterized in that, The test system for mine power supply according to any one of claims 1 to 7 comprises: Close the corresponding switching devices in each of the branch power supply circuits to operate the load simulation unit; The fault simulation unit is controlled to introduce at least one type of fault according to the operating conditions; From before the fault is introduced to after the fault is cleared, the protection and control unit collects waveform data of the main power supply bus and each of the branch power supply circuits, and records the operating data of the switching equipment. The waveform data and the running data are analyzed to obtain the test results.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the test method for mine power supply as described in claim 8 are performed.

10. A computer program product, characterized in that, The computer program product is stored in a storage medium, and the program product is executed by at least one processor to implement the test method for mine power supply as described in claim 8.

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