134 results about "Ground current" patented technology

The invention relates to a power cable insulation state real-time monitoring and alarm device, and belongs to the technical field of power equipment state monitoring. Comprising a multi-source sensing unit which is installed at a cable body and a joint; the edge computing terminal is fixed in the cable well or the ring main unit; and the cloud early warning platform receives the processing data and outputs an alarm instruction. According to the invention, multi-parameter deep fusion is realized, four-dimensional monitoring of grounding current, temperature, partial discharge and humidity is initiated for the first time, and limitation of a single parameter is broken through; and an insulation health index IHI is proposed, and the insulation deterioration degree is quantitatively evaluated. According to the method, tan delta and IHI are calculated on site through an edge-cloud collaborative architecture edge terminal, so that the data transmission quantity is reduced; the cloud dynamic threshold value is adjusted, and the alarm accuracy is improved. According to the invention, intelligent early warning mechanism three-level alarm linkage protection equipment is arranged; and the self-calibration function ensures long-term reliability.

The invention discloses a high-voltage cable grounding current abnormity monitoring system, which belongs to the technical field of electric power facilities and comprises an inspection acquisition module, an association analysis module, a collaborative reasoning module and a self-optimization module. The inspection acquisition module is used for synchronously acquiring multi-source monitoring parameters and acquiring position information so as to generate a grounding parameter matrix; the association analysis module is used for screening suspected defect types, dividing a local overheating area, performing overheating cause judgment, constructing a coupling association matrix of a multi-physical field, performing evolution stage judgment in combination with historical data, and generating a preliminary mechanism hypothesis in combination with credibility rating; the collaborative reasoning module is used for constructing a dynamic knowledge graph and a constraint prediction network, constructing a collaborative reasoning mechanism based on a two-way real-time interaction channel, performing preliminary reasoning, and dividing early warning levels in combination with comprehensive confidence so as to perform operation and maintenance feedback; and the self-optimization module is used for carrying out directional iteration on the double engines by utilizing manual feedback and carrying out cross-line migration optimization according to different lines.

The invention relates to the field of power system equipment detection, in particular to a residual magnetism measuring device and method for a large power transformer. The residual magnetism measuring device for the large-scale power transformer comprises the large-scale power transformer, a high-voltage bushing, a high-voltage neutral point bushing, a low-voltage bushing, an iron core outgoing line bushing, a first capacitor, a second capacitor, a detection impedor, a partial discharge instrument and a large-current generator, the capacitance of the first capacitor is 30pf-40pf and is matched with the capacitance of a transformer iron core, and the capacitance of the second capacitor is 300pf-400pf and is 10 times proportional to the capacitance of the first capacitor; the method comprises the following steps: carrying out a long-time induction withstand voltage and partial discharge test after a conventional test, measuring discharge amounts Q1, Q2 and Q3 at 0.5, 1 and 1.5 times of rated voltages, judging residual magnetism according to the difference value of the discharge amounts and an iron core grounding current, and if the residual magnetism exceeds the standard, magnetizing and demagnetizing by using a large current generator at the frequency of 150Hz. The method has the advantages that the residual magnetism is measured and evaluated in time, equipment faults are avoided, operation is easy and convenient, and adaptability is high.

The invention discloses a method and a system for diagnosing defects of a sheath grounding system under resonance voltage resistance of a power transmission cable. The method comprises the following steps: installing a sheath grounding current acquisition system; sequentially carrying out main insulation resonance voltage withstanding tests on three phases of the power transmission cable, and synchronously recording a grounding current waveform of a metal sheath by adopting a current acquisition system when each phase is subjected to voltage withstanding; processing the grounding current waveform by adopting a signal processing algorithm, and extracting a resonance component; and constructing a defect diagnosis matrix according to the resonance component, calculating a deviation between the defect diagnosis matrix and a standard matrix as a defect characterization value of the cable sheath grounding system, and obtaining a defect diagnosis conclusion of the sheath grounding system under the resonance withstand voltage of the power transmission cable. According to the method, the grounding current waveform of the metal sheath is synchronously acquired and analyzed in the main insulation resonance voltage withstand test of the three-phase cable, the resonance component is extracted, accurate identification of the defect is realized based on deviation calculation of the defect diagnosis matrix, and the detection sensitivity and the diagnosis reliability of the latent defect of the sheath grounding system before the cable is put into operation are improved.

The invention discloses a cable fault monitoring and early warning method and system, and relates to the technical field of fault monitoring. The method comprises the steps that cable operation state parameters and environment parameters are collected in real time through a distributed sensor array, and the cable operation state parameters comprise cable temperature, three-phase current, partial discharge signals, insulation resistance, grounding current and mechanical vibration amplitude; the environment parameters at least comprise temperature and humidity corresponding to a cable laying environment; preprocessing the cable operation state parameters and the environment parameters, and generating a standardized feature matrix based on preprocessed multi-source data; inputting the standardized feature matrix into a pre-trained fault prediction model for processing to obtain a fault type and a fault risk index corresponding to the current operation state of the cable; and triggering an early warning mechanism according to the fault type and the fault risk index, and outputting corresponding fault position information.

The invention provides a current sampling system of a common-power power ground and a multi-channel solid state power controller, and relates to the technical field of electronics, and the current sampling system of the common-power power ground comprises a plurality of sampling modules, a corresponding number of switch modules and an MCU. And the ith sampling module is matched with the ith switch module to sample the ith load current. And the other end of the load is connected with the positive electrode of the power supply through the switch module. The sampling unit of the sampling module is connected in series between the switch module and the positive electrode of the power supply. The sampling reference end of the sampling module and the grounding end of the MCU are connected with the negative electrode of the power supply. The MCU controls the conduction state of the switch module, the sampling module samples the load current when the switch module is conducted, converts the load current into a voltage signal and outputs the voltage signal to the MCU, and the current sampling circuit solves the problems that a current sampling circuit in the related technology is high in cost and large in size.

The invention relates to the technical field of electrical safety, and discloses a current monitoring and shielding leakage response method and system for SNELPD water immersion protection. According to the invention, the original current waveform is monitored in real time, so that the grounding state characteristic quantity is acquired according to the grounding current waveform data and the leakage current waveform data, and the final potential offset and the potential trend characteristic quantity are analyzed from the shell potential waveform, so that the insulation resistance change caused by water immersion can be captured earlier and more sensitively; then, a coupling mechanism and an evolution law between current and potential characteristics are mined, a comprehensive risk index is obtained, high-risk coupling states such as grounding efficiency reduction and potential accelerated drifting are accurately captured, the problem that in the prior art, multi-parameter internal relevance and a diagnosis blind area of a co-evolution law cannot be revealed is solved, and the diagnosis accuracy is improved. The accuracy and the reliability of early recognition of '0 potential' damage and shielding leakage risks caused by soaking of the SNELPD equipment are remarkably improved.

The utility model relates to a leakage current detection device and an inversion device, the leakage current detection device comprises a pulse signal generation module, a transformer, an energy storage module, a current transformer, a sampling module and a filtering module, a first end of a primary winding of the transformer is connected with the pulse signal generation module, and a second end of the primary winding is grounded through the energy storage module; a first end of a secondary winding of the transformer is connected with a first end of a secondary coil of the current transformer, a second end of the secondary coil is grounded through the sampling module, a second end of the secondary winding is grounded, a magnetic core of the current transformer is sleeved on a power line to be detected, and the filtering module is connected with the second end of the secondary coil. The filtering module can filter out signals whose frequency is greater than or equal to the frequency of the pulse signals, and retains signals induced based on the leakage current, thereby achieving the detection of the leakage current, and facilitating the improvement of the working reliability of the power equipment where the to-be-detected power line is located.

The invention relates to the technical field of current calculation, and discloses a digital compensation grounding current calculation method and device, terminal equipment and a storage medium. The method comprises the following steps: when a current signal of any phase of a three-phase current is obtained, obtaining a sampling value, a gain coefficient and a bias coefficient of a channel where the current signal is located and a sampling moment of the current signal; firstly calculating the bias error of the bias coefficient, then calculating the gain error of the gain coefficient, and finally calculating the phase error at the sampling moment; and compensating the sampling value according to the bias error, the gain error and the phase error to obtain a compensated three-phase current, and calculating a grounding current based on the compensated three-phase current.

The invention discloses an overhead transmission line fault detection and classification method based on discrete wavelet transform and a time sequence convolutional network, and relates to the technical field of electronics. The method comprises the following steps: acquiring original signals of three-phase current and grounding current of the overhead transmission line, and carrying out normalization processing and moving average filtering preprocessing; discrete wavelet transform (DWT) of a Daubechies wavelet basis function Db4 is adopted to perform multi-scale decomposition on the preprocessed signal, a high-frequency detail coefficient is extracted, and a multi-channel time sequence input vector is constructed; and inputting the input vector into a time sequence convolutional neural network (TCN). According to the method, fault features are efficiently extracted through DWT, time sequence data are accurately modeled through TCN, the problems that a traditional method is low in accuracy, slow in response and weak in anti-interference capacity in a complex fault scene are solved, the fault classification accuracy is 99.9%, the parallel computing capacity is high, training is stable, the method can adapt to different fault conditions, and the method is suitable for large-scale popularization and application. And the operation reliability and the intelligent protection level of the power system are effectively improved.

The application describes a PV energy generation installation having a central inverter unit (20) for attachment to a PV generator, the PV generator comprising a plurality of PV main strings (PVn) connected in parallel, each connected on the input side with the central inverter unit (20) via a DC line. According to the invention, a monitoring unit (21. N) is assigned to each pair of DC lines assigned to a PV main string (PVn), said monitoring unit comprising a differential current measuring device (8. N), a disconnect switch (9.n) and a monitoring control device (17. N), which is designed to switch the disconnect switch (9.n) and open the PV main string (PV.n) after a differential current threshold value IS, Diff is exceeded. In addition, a ground monitoring device (GFDI) (22) is arranged between one pole of the intermediate circuit (7) and a ground connection (13), which ground monitoring device comprises a ground current measuring device (10), a circuit breaking element (11) and a control device (12), the control device (12) being designed to detect a ground fault by exceeding a ground current threshold value IS after detecting the ground fault. If the earth fault still exists after the end of a defined delay time T, the circuit breaking element (11) is triggered after the delay time T. The invention further relates to a method for fault current monitoring of a facility of this type.

The utility model discloses a filter module and filter of filter, filter module includes: base shell has accommodating space, conductive shell sets up in the outside of base shell, conductive sheet includes current inflow end, current outflow end and the conductive sheet main body between current inflow end and current outflow end, and the conductive sheet main body is installed in accommodating space, and current inflow end and current outflow end extend to the outside of accommodating space, at least one built -in filter element, at least one built -in filter element one end is connected with conductive sheet electricity, and the other end is connected with conductive shell electricity and is grounded, at least one external filter element, at least one external filter element one end is connected with current inflow end electricity, and the other end is suitable for connecting in application equipment and is grounded. At least one built -in filter element is connected in conductive shell ground, and at least one external filter element is connected in application equipment and is grounded, can reduce the resistance of ground current flow.

The invention provides an end screen grounding current monitoring method, device and equipment, a medium and a program product, and relates to the technical field of power grids. According to the end screen grounding current monitoring method, the acquisition of the end screen grounding current including the multi-frequency domain characteristic of the converter station bushing is realized through the broadband current sensor, the sampling precision of the end screen grounding current is improved, the integral coefficient of the digital integral inversion algorithm is corrected, the integral error is reduced, and the sampling precision of the end screen grounding current is improved. Dynamic error compensation of equivalent voltage waveform data obtained through inversion of a corrected digital integral inversion algorithm is achieved, the monitoring precision and stability of the end screen grounding current are improved, and an effective means is provided for early warning of the insulation state of a converter station sleeve. And therefore, the requirements of early fault early warning of the target converter station sleeve and the requirements of intelligent operation and maintenance of the converter station sleeve on high-bandwidth acquisition and intelligent diagnosis can be met.

The invention discloses a power grid grounding simulation method and system based on multi-parameter coupling modeling. The method comprises the following steps: acquiring soil resistivity, lightning stroke current waveform data and morphological structure information of a grounding electrode at different depths and geographic positions; constructing a recursive coupling current equation based on time history feedback, and recursively calculating a local grounding current distribution function at the current moment and at the spatial position by adopting a multi-channel dynamic weighting mechanism based on the recursive coupling current equation; fractal dimensions are dynamically calculated according to the soil resistivity and the morphological structure information of the grounding electrode, and a fractal current distribution function is established based on the fractal dimensions and a local grounding current distribution function; the local current value and the fractal current distribution function are fused, the total grounding current is dynamically calculated in a time integration mode, and step voltage is calculated in combination with a current response function, the soil resistivity and the lightning stroke waveform; and determining the state of the grid grounding system based on the total grounding current and the step voltage.

The invention provides a direct-current transmission project stray current event identification method considering multi-working-condition influence, and the method comprises the following steps: A, obtaining related data of ground stray current, carrying out the preprocessing, and outputting a smoothed data sequence; b, according to the smoothed data sequence output in the step A, constructing a catastrophe point detection model considering an adaptive threshold value, detecting catastrophe points of the ground stray current and determining a catastrophe interval of the ground stray current; and C, extracting ground stray current data according to the ground stray current abrupt change interval obtained in the step B, clustering the data of the abrupt change interval through down-sampling K-Means, and judging the type of the stray current of the direct current transmission project. According to the method, the mutation points are accurately detected through the self-adaptive threshold model; by means of down-sampling K-Means, the clustering accuracy is guaranteed, and meanwhile the operation speed is increased; and the stray current type is judged in combination with a clustering result, and a data basis is provided for direct-current transmission project stray current treatment.

The application discloses a kind of transmission line tower grounding resistance measurement method and system, it is related to high-voltage transmission technical field, the measurement method includes the following steps: first electric signal is sent to coupling injection module, makes coupling injection module to the two lightning arresters of transmission line tower Synchronous injection same second electric signal;Two lightning arresters are collected at the voltage signal and current signal of second electric signal injection place;According to the voltage signal and current signal of collection transmission line tower grounding resistance is calculated.The application is injected into the same second electric signal by coupling injection module to two lightning arresters Synchronous, greatly weaken the circulation between two lightning arresters, so that the ground current component can be better extracted, ground resistance value can be quickly and accurately obtained, improve measurement efficiency, and reduce the error caused by human operation, this kind of measurement mode does not need to insert auxiliary grounding electrode and lay long distance lead, it is convenient to operate, and the scope of application is wide.

This invention relates to the field of transformer monitoring technology, specifically to an online monitoring device and handling system for grounding current of transformer core and clamps. The system includes a data acquisition module, a current analysis module, a linkage analysis module, an early warning determination module, and a fault determination module. First, it analyzes the current surge and relative stability of the current data to determine the linkage characteristic of the current surge; then, it removes background current to obtain the true fault current; it determines the synchronization of the linkage response time between current and temperature; combining the linkage characteristic of the current surge and the synchronization of the linkage response time, it determines the early warning value for a metallic grounding fault; when the early warning value for a metallic grounding fault exceeds the preset normal early warning range, it compares the characteristics of different fault locations at the current moment with those in the historical database to obtain the fault location corresponding to the current moment. This invention achieves intelligent fault location determination.

The invention provides a low-voltage power distribution network grounding leakage fault positioning and identification system and method, and the system comprises a first measurement unit which is disposed at a low-voltage power distribution main line and is used for synchronously collecting the synthesized residual current of a three-phase phase line and a neutral line; the second measuring unit is arranged on a neutral point grounding wire of the distribution transformer and is used for collecting grounding leakage current; the reference measurement unit is used for synchronously acquiring three-phase voltage information; and a data synchronization and communication module and a central analysis terminal. The central analysis terminal compares the residual current with the grounding current under the synchronization condition, judges that the leakage fault is located at the upstream or downstream of the measurement point, and identifies the fault phase based on the phase or correlation between the grounding current and the three-phase voltage; according to the invention, rapid positioning, phase identification and operation state discrimination of grounding leakage faults can be realized.

This invention discloses a method and system for early warning of grounding wire breakage in armored shielded DC cables. The method includes: measuring the grounding current of the shielding layer and the grounding current of the armoring layer at both ends of the armored shielded DC cable; calculating the waveform similarity between the grounding current of the armoring layer and the grounding current of the shielding layer at each end; comprehensively judging whether a grounding wire breakage has occurred at each end based on the current amplitude, waveform similarity, cable operating status, and grounding grid health status; and issuing a corresponding breakage warning signal when a grounding wire breakage occurs. This invention can effectively improve the operation and maintenance level of substation secondary circuits.

This application relates to a method, apparatus, and computer equipment for determining short-circuit faults in a double-circuit DC transmission line on the same tower. The method includes: if at least two faulty lines are detected in the double-circuit DC transmission line on the same tower, then, based on the rectifier station end current, inverter station end current, and line grounding current of each faulty line, determining the candidate short-circuit line among the at least two faulty lines; and based on the rectifier station end current, inverter station end current, and loop grounding current of the candidate short-circuit line, determining the target short-circuit line among the candidate short-circuit lines. This method can increase the efficiency and accuracy of target short-circuit line determination and significantly reduce the consumption of manpower and material resources.

The invention relates to the technical field of electrical variable measurement, in particular to a high-voltage switch cabinet partial discharge monitoring method and system, and the method comprises the steps: obtaining a partial discharge signal and a grounding current signal of a high-voltage switch cabinet, and determining a comprehensive discharge threat degree; determining a grounding correlation factor; determining a discharge intensity comprehensive index according to the comprehensive discharge threat degree and the grounding correlation factor; according to the discharge intensity comprehensive index sequence in the first preset time period, the discharge intensity comprehensive index sequence in the second preset time period and the Z score of the discharge intensity comprehensive index in the third preset time period, the comprehensive early warning index is determined, and the second preset time period is larger than the first preset time period. The third preset time period is greater than the second preset time period, and insulation fault early warning is carried out on the high-voltage switch cabinet by using the comprehensive early warning index. Therefore, the reliability and the accuracy of the partial discharge monitoring result of the high-voltage switch cabinet are improved.

This invention relates to the field of antenna technology, providing a circularly polarized antenna element and its array. The circularly polarized antenna element includes a support structure, a radiating module, a feeding module, and a current perturbation structure. The radiating module is mounted on the support structure and has two feed points. The feeding module is also mounted on the support structure and is coupled and / or electrically connected to the radiating module through the two feed points, enabling the radiating module to emit circularly polarized waves. One end of the current perturbation structure is grounded, and the other end is coupled to the radiating module, grounding at least a portion of the unbalanced current in the radiating module. The two orthogonal signals generated by the feeding module are transmitted to the radiating module through the two feed points, enabling the radiating module to emit circularly polarized waves and achieve communication functionality. Simultaneously, the grounded current perturbation structure adjusts the magnitude and direction of the unbalanced ground current in the radiating module, balancing the current magnitude in various directions and positions of the radiating module, thus improving its wide beam angular-to-axial ratio performance.

The application discloses a kind of induction logging instrument systems and acquisition method based on plasma optical fiber sensor, including ground current emission source and at least one well in current emission source and well in receiving acquisition device, the well in receiving acquisition device is connected with the optical system of induction signal detection being arranged on ground, the optical system is composed of sequentially connected broadband light source, polarizer, polarization controller, fiber optic circulator and spectrum analyzer, the fiber optic circulator is connected with well in receiving acquisition device and spectrum analyzer respectively, at least two plasma resonance optical fiber sensing probes are arranged in the well in receiving acquisition device. There is no mutual interference or crosstalk between plasma resonance optical fiber sensor, optical fiber sensor and emission power supply and antenna, and it is not easy to be disturbed by environmental electromagnetic noise, and multi-channel large data high-speed real-time transmission can be realized by using armored photoelectric composite cable connected with each well in receiving acquisition device.

The utility model relates to a target disc grounding monitoring device of an ion implanter, which is characterized by comprising a target disc for bearing a wafer to perform ion implantation operation, the target disc is opposite to an electronic shower system above the target disc, a grounding pole is arranged in the target disc, the target disc is provided with an abdicating hole for the grounding pole to extend out, and the abdicating hole is communicated with the target disc. The top of the grounding pole is in contact with the wafer, the bottom of the grounding pole is connected with a grounding wire extending towards the outside of the target disc, a sensor is arranged below the target disc, the sensor is used for detecting grounding current, and the sensor is electrically connected with a dose control system of the ion implanter. The target disc grounding device has the following advantages and effects: the performance of the target disc grounding device can be detected in real time so as to realize abnormal risk prevention of the target disc grounding device.

The invention provides a multi-point grounding current-limiting switching control device and method for a transformer iron core clamp, and particularly relates to the technical field of transformer operation state monitoring and fault control, and the device comprises a distributed monitoring module, a fault positioning unit, an intelligent switching controller and a self-healing current-limiting unit. According to the invention, the distributed current sensor and the magnetic field sensor cooperatively collect data, and the fault positioning error can be controlled within 5cm by combining wavelet transform to extract high-frequency features and a magnetic field gradient algorithm, so that blind maintenance caused by inaccurate positioning in the prior art is avoided; meanwhile, three-level threshold values are dynamically corrected based on the material of the iron core and the operating age limit, temperature closed-loop adjustment is introduced, early warning can be conducted in time at the initial stage of a fault, the current limiting unit can be accurately switched according to the severity degree, unnecessary shutdown losses are reduced, and the risks of local overheating of the iron core and sharp loss increase caused by over-current limiting or under-current limiting are reduced.

The present application relates to the technical field of power system protection, and particularly relates to a static var generator grounding fault protection method, a system and a medium, comprising determining a grounding fault load distribution imbalance area of the static var generator according to a zero sequence grounding current characteristic quantity; in the grounding fault load distribution imbalance area, the electrical coupling stability of the fault area is evaluated according to electrical coupling correlation data between different component parts inside the static var generator, the current electrical stability state and a key influence component list are obtained, the load distribution of the grounding fault load distribution imbalance area is adjusted, and a load distribution optimization scheme is obtained; the optimal protection action timing is determined; the protection action instruction set is generated based on the optimal protection action timing and the load distribution optimization scheme, and the static var generator is controlled to perform grounding fault protection. The present application realizes fast, accurate and orderly protection action of the static var generator in the grounding fault through dynamic adjustment of the load distribution.

Disclosed is a system (200A-200D) and a method (300) for managing an electric grid (100) with a substation (102) having a transformer (104). The system includes a current sensing unit (202) that measures ground or neutral current at the transformer neutral and traveling wave fault recording units (204) installed on feeder lines (112) to detect and record arrival times of traveling waves generated by a fault event. A processing arrangement (206) communicates with the current sensing unit and the traveling wave fault recording units, receiving information about ground or neutral current and traveling wave arrival times. The processing arrangement detects earth faults in feeder lines, or the substation based on the received information and computes the fault location in response to detecting an earth fault, using the information about the arrival time of traveling waves.

The invention provides a transient grounding current measurement and diagnosis device and method based on hollow mutual inductor cooperation. The transient grounding current measurement and diagnosis device comprises a mutual inductor module, a data acquisition and conversion module, a signal conditioning and protection module, a master control and storage module, a collaborative algorithm module, an intelligent trigger module, a power supply module, a communication and positioning module and a protective shell. According to the transient grounding current measurement and diagnosis device and method based on cooperation of the hollow mutual inductor provided by the invention, the full waveform of the transient grounding current can be accurately measured, the total underground lightning current can be accurately inverted, and the shunting condition of each grounding path of power equipment can be analyzed in real time; the health state of the grounding system is intelligently diagnosed, a specific fault grounding path is accurately positioned, and the capture rate and reliability of lightning stroke events are improved.

This invention discloses a method, system, device, and medium for identifying faults in parallel converter transformers. The method includes acquiring the operating parameters of the parallel converter transformers; wherein the operating parameters are the self-generated zero-sequence current integral value IY0Y10 of the phase current on the first parallel converter transformer network side, the self-generated zero-sequence current integral value IY0Y20 of the phase current on the second parallel converter transformer network side, and the neutral point grounding current IGNDY on the parallel converter transformer network side; when the operating parameters satisfy a first discrimination condition or a second discrimination condition, a fault is determined to have occurred; wherein the first discrimination condition is that IY0Y10 ≥ I 0set or IY0Y20≥I 0set I 0set The preset parameter is the zero-sequence current amplitude; the second discrimination condition is 0 < IY0Y10 < I 0set And 0 < IY0Y20 < I 0set and satisfy K set The parameters for the symmetry of the zero-sequence current distribution are preset. This invention can solve the problem of poor backup protection sensitivity in parallel converter transformer neutral point connected and grounded systems, enabling timely activation of transformer protection actions to protect the transformer and effectively improving the backup protection sensitivity of parallel converter transformers.

The utility model discloses an intellectualized monitoring terminal of transformer and transformer, relates to transformer monitoring technical field, the intellectualized monitoring terminal of transformer includes casing, PCB subassembly and a plurality of waterproof joint, the PCB subassembly is provided in the casing, PCB subassembly includes two PCB board, one PCB board is provided with a communication unit, the other PCB board is provided with a plurality of waterproof joint, the waterproof joint is provided with a plurality of waterproof joint. The communication unit comprises an RS485 interface, a DI input interface, an Ethernet port, an optical fiber interface, an HDMI interface, a USB interface and a relay output interface. The other PCB is provided with a signal acquisition unit and a signal processing unit, the signal acquisition unit comprises a voltage monitoring interface, a current monitoring interface, a grounding current interface, an RTD circuit interface and an analog signal input interface, and the signal processing unit is in communication connection with the signal acquisition unit and the communication unit; the waterproof connectors are arranged on the shell at intervals. The intelligent monitoring terminal provided by the utility model can monitor multiple parameters in the operation process of the oil-immersed transformer and the dry-type transformer, and is good in adaptability.