453 results about "Potential transformer" patented technology

The invention provides an intelligent monitoring and early warning method based on multi-source information fusion, and belongs to the technical field of intelligent diagnosis and early warning, and the method comprises the steps: synchronously collecting the multi-modal data of a voltage transformer, the multi-modal data comprising voltage / current waveform, partial discharge signal, temperature and vibration data; preprocessing the multi-modal data, wherein a preprocessing method comprises waveform segmentation, spectrogram generation and scalar normalization; constructing a dynamic weight distribution mechanism: calculating a weight matrix based on the relevance between the time sequence features and the spatial features, and dynamically adjusting scalar weights by combining the physical coupling relationship between the temperature and the vibration to generate feature fusion weights; iteratively updating the weight matrix according to the real-time prediction error; fusing the time sequence features, the spatial features and the scalar features through the dynamic weight distribution mechanism to generate a comprehensive feature vector; and synchronously outputting a fault type classification result and an equipment health score based on the comprehensive feature vector, and calculating a real-time prediction error.

The invention relates to the technical field of voltage transformers, in particular to a voltage transformer real-time monitoring system based on broadband and edge calculation, which comprises the steps of collecting multiple paths of voltage transformer data, extracting peak values and zero cross points, comparing jump rising edge time differences, unifying time sequences, extracting extreme values and slope identification disturbance sections, and monitoring the voltage transformers in real time. Measuring amplitude continuous change to judge the offset trend, analyzing trend direction classification waveform fragments, and combining the three indexes to generate an operation state label. According to the method, a unified time sequence is constructed by comparing cross-channel jump rising edge time differences, multi-channel jump process alignment is achieved, the synchronous anomaly recognition capability is improved, the number of extreme values and the slope direction are extracted to recognize a disturbance dense section, continuous anomaly is judged by combining statistics of overrun, and the fluctuation trend is judged by tracking the deviation trend between extreme values. And based on the three-index combination classification operation state, the anomaly identification precision is improved.

The utility model relates to the field of resonance eliminators, and discloses a protection element and a current limiting type resonance eliminator, the protection element comprises at least two groups of protection units, the two adjacent groups of protection units are connected in series, and each protection unit comprises a protection module; the current-limiting resonance eliminator based on the current-sensitive resistor made of the current-sensitive material is connected in series between the PT neutral point and the ground. Under the normal operation condition, the current-limiting resonance eliminator is in a low-resistance state, and system parameters and PT performance are not affected; when excitation energy is generated due to a system fault, the current-limiting resonance eliminator suddenly changes into a high resistance state, quickly absorbs resonance energy, destroys resonance parameters, suppresses PT excitation current below 200mA, and ensures that a voltage transformer is unsaturated and a PT fuse is not fused; and a built-in current sensor is connected, so that the running state of the current-limiting resonance eliminator can be monitored in real time.

The invention discloses a voltage transformer state influence factor analysis method, system and device and a medium, and belongs to the technical field of voltage fault analysis, and the method comprises the steps: collecting state parameters of a voltage transformer, carrying out the preprocessing of the state parameters, and constructing a nonlinear coupling relation between multidimensional feature tensor capture features; analyzing voltage fluctuation characteristics of the voltage transformer, and automatically correcting the insulation state evaluation model; and inputting abnormal feature vectors obtained by monitoring into a recursive attribution decision tree model, carrying out multi-dimensional abnormal clustering and causal analysis, generating a tracing report, and carrying out multi-dimensional evaluation and verification on an analysis result. According to the invention, continuous dynamic full-coverage monitoring of the equipment insulation health condition is realized, the accuracy and robustness of anomaly detection are improved, the phenomena of missing detection and false alarm are reduced, the scientificity of anomaly tracing analysis and the interpretation of early warning decision are improved, and the reliability of the system is improved. And the intelligent level of the monitoring and early warning system is improved by continuously adapting to new abnormal types and complex operation environments.

The invention provides a new energy station high-voltage voltage transformer error evaluation method and system, and the method comprises the steps: collecting the voltage phasors of all measurement nodes in a preset time period at a transformer substation and a new energy station at the same time, obtaining the equipment parameters of a voltage transformer and the line parameters between the measurement nodes, and constructing a measurement data set; the method comprises the following steps: constructing a corresponding adjacency matrix and a node characteristic matrix by extracting line impedance and node working condition characteristics based on a power system line topological structure and data in a measurement data set, and obtaining a time sequence diagram structure data set according to the adjacency matrix and the node characteristic matrix; constructing a graph neural network, and training the graph neural network based on the time sequence graph structure data set; and inputting the voltage phasor of each measurement node, and based on the output result of the trained graph neural network, judging the state of the voltage transformer through a preset threshold value. According to the scheme, online evaluation of the error state of the voltage transformer can be realized, and the accuracy and interpretability of error evaluation are improved.

The invention relates to the field of electric power measurement, and provides a voltage transformer error evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: collecting the voltage phasor information of a measurement node in a preset time window, and obtaining the reference technical parameters of a voltage transformer corresponding to the measurement node; feature extraction based on a sliding window is carried out, sequence diagram structural features are obtained in combination with an adjacent matrix, and the adjacent matrix is constructed based on network topology and line electrical parameters of a power system; error estimation is carried out through a trained error estimation model based on the time sequence diagram structure features, an error estimation value is obtained, and the error estimation model is obtained by training a graph neural network model based on historical voltage phasor information and corresponding error labels; and performing error state evaluation based on the error estimation value. According to the method, the device, the electronic equipment and the storage medium provided by the invention, online continuous evaluation of the voltage transformer error is realized, and the limitations of long period and high cost of a traditional offline verification method are broken through.

The invention belongs to the technical field of nuclear power, and particularly relates to a ground capacitance measurement method based on series capacitance and high-frequency signal injection. In order to solve the problem that a traditional signal injection method cannot accurately calculate the ground capacitance level of a power distribution network, the invention provides a ground capacitance measurement method based on a series capacitor and high-frequency signal injection. The leakage inductance of the voltage transformer is accurately measured by injecting the high-frequency signal, so that a resonance point is convenient to find during frequency sweeping, and the resonance point measured during frequency sweeping is more accurate.

The invention relates to the technical field of power system monitoring, discloses an anti-harmonic PT current monitoring system and method, and aims to solve the problem of secondary side current signal distortion of a voltage transformer caused by power grid harmonic pollution in the prior art. The method comprises the steps of electrifying and initializing a system, starting a high-speed analog-to-digital converter to acquire a voltage signal, executing fast Fourier transform to identify dominant harmonic waves, calculating and configuring a capacitance value of a tunable LC trap unit to suppress specific harmonic waves, and finally outputting a high-fidelity analog voltage signal in direct proportion to fundamental current. The system comprises a current-voltage conversion module, a tunable LC notch filter array, a high-speed analog-to-digital converter, a digital signal processing unit and a microcontroller. According to the technical scheme, dynamic self-adaptive suppression and precise selective harmonic wave blocking of power grid harmonic waves can be realized, low delay and high fidelity characteristics are guaranteed, and the engineering practicability and reliability of the system are improved.

The invention discloses a method for accurately measuring voltage, current and phase angles of a sectional intelligent electric energy meter, which relates to the technical field of electric energy meter metering and comprises the following steps of: S1, constructing a sectional load-mutual inductor angle difference correlation model, and dividing a plurality of load intervals according to an application scene of the sectional intelligent electric energy meter and working characteristics of a mutual inductor, acquiring current transformer angular difference data and voltage transformer impedance drift related data in different load intervals, and establishing and storing an association relationship between each load interval and a corresponding transformer angular difference compensation coefficient in combination with inherent parameters of the transformer; according to the invention, a segmented load-mutual inductor angle difference correlation model is constructed in advance, load voltage and current amplitude data are collected in real time to accurately determine a current load interval, and a corresponding mutual inductor angle difference compensation coefficient is automatically matched to carry out dynamic adaptive compensation on an initial phase angle. The problem of phase deviation caused by angular difference nonlinear change of a current transformer in different load intervals and impedance drift of a voltage transformer in the prior art is solved.

The invention discloses a voltage transformer current-sensitive intelligent resonance elimination device and a fault monitoring method thereof, belongs to the technical field of fault monitoring, and aims to solve the problems that a traditional current-sensitive resonance elimination device is unknowable in state, resonance and instantaneous disturbance are difficult to distinguish, the fault identification precision is low, and the operation and maintenance efficiency is poor. The device comprises a flow-sensitive response module and an intelligent monitoring assembly. The current-sensitive response module comprises a response body and a built-in current sensing element; the intelligent monitoring assembly constructs an associated time sequence data set by collecting a real-time electrical signal and a state signal of the current-sensitive response module so as to judge whether the power grid system enters a resonance state; response signal validity calibration and fault identification operations are executed on the flow sensitive response module by constructing a response feature set; the method comprises the following steps: constructing a monitoring data set, extracting evaluation dimensions to perform performance analysis on a flow-sensitive response module, and generating a performance score of the flow-sensitive response module; response monitoring accuracy and operation and maintenance intelligence are remarkably improved, and accurate research and judgment and intelligent operation and maintenance of the resonance state of the power grid are supported.

The invention discloses a capacitor voltage transformer on-line verification and state early warning method and system, and the method comprises the steps: synchronously collecting the secondary side time sequence data of a target CVT and other CVTs of the same bus with the target CVT through a power monitoring system; based on secondary side time sequence data of a plurality of CVTs on the same bus, screening out a CVT equipment group with consistent state through group consistency analysis, and generating a virtual standard reference value for error calculation; calculating a relative deviation between the secondary voltage measurement value of the target CVT and the virtual standard reference value as a first evaluation result; performing feature extraction on the secondary side time sequence data to obtain a feature vector representing the operation state of the target CVT, inputting the feature vector into a pre-trained intelligent evaluation model to obtain an error prediction value or a health state score of the target CVT, and taking the error prediction value or the health state score as a second evaluation result; and fusing the first evaluation result and the second evaluation result to obtain a comprehensive evaluation conclusion of the running state of the target CVT, and if the state level exceeds a normal range, generating early warning information.

The invention relates to the technical field of electromagnetic measurement and state monitoring, and discloses a global state sensing system and method for an electromagnetic voltage transformer. The technical problems that in the prior art, data robustness is insufficient and actual working condition changes of a power grid are difficult to adapt due to the fact that accurate resonance circuit parameters are depended and a single calculation path is adopted are solved. According to the method, ferromagnetic resonance phenomena under various faults are simulated based on electromagnetic transient simulation, phenomenon data are obtained, and influence factors are analyzed to obtain influence rule data. And taking the rule data as input, and adopting a comprehensive solving method combining programming calculation, system structure chart calculation and electromagnetic transient software simulation to obtain a high-reliability state quantity time sequence. Based on the time sequence, a nonlinear model which takes loss into account and does not depend on precise resonant circuit parameters is derived, and explicit mathematical functions of primary current and transient overvoltage of the voltage transformer are obtained.

The invention provides a non-effective grounding voltage transformer and a voltage mutual inductance state monitoring method, the non-effective grounding voltage transformer comprises a main voltage transformer and a zero sequence voltage transformer, the main voltage transformer comprises a primary high voltage winding, a secondary low voltage winding and a secondary protection winding, the zero-sequence voltage transformer comprises a zero-sequence primary winding, a zero-sequence secondary winding and a zero-sequence protection winding; a neutral point of the primary high-voltage winding is electrically connected with one end of the zero-sequence primary winding, a neutral point of the secondary low-voltage winding is electrically connected with one end of the zero-sequence secondary winding, and the other ends of the zero-sequence secondary winding and the zero-sequence primary winding are grounded; one end of the secondary protection winding and one end of the zero-sequence protection winding are grounded, the other end of the zero-sequence protection winding is grounded, and the other end of the secondary protection winding is grounded through the current-sensitive resonance elimination resistor; when a power distribution system is disturbed and attempts to cause resonance, the iron core of the zero sequence voltage transformer is rapidly saturated, which is equivalent to that a resistor is connected in series in a loop, so that a large amount of resonance energy is consumed and a resonance elimination effect is achieved.

The application relates to a method and device for monitoring over-error of a capacitive voltage transformer, electronic equipment and a computer readable storage medium. The method comprises: performing kernel principal component analysis based on historical sample data to determine an SPE statistical quantity threshold; calculating the SPE statistical quantity of current sample data collected in real time; if the SPE statistical quantity is less than or equal to the SPE statistical quantity threshold, determining that the operation state of the transformer group is normal; and if the SPE statistical quantity is greater than the SPE statistical quantity threshold, calculating the contribution rate of each element in the current sample data to the square prediction error statistical quantity, determining a fault element, and locating an over-error transformer in the transformer group. The application effectively processes the nonlinear problem of data by using KPCA, more accurately extracts data features, realizes fault element separation, accurately locates the over-error CVT, performs online real-time monitoring on the CVT error, and improves the stability and reliability of the power system.

The application discloses an online monitoring method of a voltage transformer based on independent component analysis, which samples information of historical data, steady-state data and real-time data of signals output by the voltage transformer, constructs a data set from the historical data, and imports the data set into an initial SDAE network model based on a sparse denoising autoencoder to perform dynamic training, uses the steady-state data to fine-tune parameters based on the SDAE network model obtained through offline training, and thus obtains encoding data of the SDAE network model; uses an independent component analysis method to perform independent component decomposition by taking the encoding data as input; calculates sample statistics and overall statistical threshold, compares real-time statistics with the overall statistical threshold, and if the real-time statistics are lower than the overall statistical threshold, it is determined that the state of the voltage transformer is normal in this round of judgment; otherwise, it is considered that there is an abnormal voltage transformer in the voltage transformer group.

The utility model relates to the field of electric power system and high voltage switch equipment discloses vacuum circuit breaker with signal feedback mechanism, including arc extinguishing chamber, the bottom fixedly connected with mechanism box of arc extinguishing chamber, the outside of mechanism box is provided with quick -witted connection mechanism, the top fixedly connected with voltage transformer of quick -witted connection mechanism, the outside fixedly connected with base of mechanism box, the outside of base is provided with quick -witted break mechanism, quick -witted connection mechanism includes support connecting plate, the outside fixedly connected with air cylinder no.

The utility model discloses a voltage transformer convenient to post maintenance, including voltage transformer body, the outside department symmetry of voltage transformer body is installed left connecting casing and right connecting casing, and the front end outer wall and rear end outer wall of left connecting casing and right connecting casing all symmetry are installed with the joint cavity, one end of joint cavity all is penetrated and is offered with the through cavity, and the both sides of through cavity all symmetry are offered with the limiting slot, the utility model discloses in the installation process to voltage transformer body, according to hoisting demand or ordinary placing demand, flexible installation series connection board and mounting plate to the top or bottom of voltage transformer body, can satisfy different installation demand, adopt this kind of mode, make the device in the use process, there is no limitation, and all adopt the mode of joint or plug -in installation, discard the traditional bolt fixed mode, improve the convenience of voltage transformer body post maintenance or overhaul, improve the practicality of device.

The invention discloses a broadband harmonic voltage measuring system and method based on an improved CVT, and the system comprises a first current sensor which is used for measuring the first current of a high-voltage capacitor of the CVT; the broadband harmonic wave acquisition device is used for sampling the first current to obtain first current sampling data; and the broadband harmonic analysis device is used for determining an amplitude frequency spectrum of the first current based on the first current sampling data and determining each frequency component of the system voltage based on the amplitude frequency spectrum of the first current. On the basis of a large number of CVTs used in a power system, the broadband harmonic voltage measurement function within the range of hundreds of kHz is achieved by improving the CVT, the original power frequency measurement function of the CVT is not changed, the operation reliability of the CVT is not reduced, and effective broadband, high-precision and low-cost harmonic voltage measurement can be achieved.

The topology circuit comprises a power grid and the high-voltage frequency converter, one end of the high-voltage frequency converter is connected with the power grid through an input circuit breaker, and the other end of the high-voltage frequency converter is sequentially connected with an electric reactor, an output circuit breaker and a load. An output voltage transformer is connected between the high-voltage frequency converter and the reactor; the load is also connected to a power grid through a bypass circuit breaker; the power grid is connected with an input voltage transformer; the high-voltage frequency converter is further connected with a PLC, and the PLC is connected with the input circuit breaker, the output circuit breaker, the bypass circuit breaker, the input voltage transformer and the output voltage transformer. The high-voltage frequency converter frequency conversion and power frequency undisturbed switching method has the advantages that undisturbed switching between the frequency conversion operation mode and the power frequency operation mode of the frequency converter is achieved, and the defect that a traditional frequency conversion and power frequency switching mode is only suitable for rotating equipment and cannot be applied to other loads is overcome.

The application discloses a capacitive voltage transformer and a processing method, device and storage medium thereof. The capacitive voltage transformer comprises a frequency relay arranged in a secondary winding of an intermediate transformer and used for detecting a voltage frequency in a circuit in which the capacitive voltage transformer is located, wherein the intermediate transformer is an intermediate transformer in an electromagnetic unit of the capacitive voltage transformer; a connecting plate connected with the intermediate transformer and used for adjusting a working frequency of the capacitive voltage transformer according to the voltage frequency; and a compensation reactor connected with the connecting plate and used for adjusting a reactance value in the circuit according to a terminal of the connecting plate. Through the application, the problem that the capacitive voltage transformer can only work at one frequency in the prior art and the use range of the capacitive voltage transformer is small is solved.

The utility model discloses a voltage transformer primary coil full-automatic numerical control winding machine which comprises supports which are oppositely arranged on a machine frame and can be opened and closed, the machine frame is further provided with a paper feeding device arranged on one side of a winding displacement device, and the paper feeding device comprises a paper storage mechanism, a transmission mechanism, a paper cutting mechanism and a paper pressing mechanism. The paper pressing mechanism comprises a paper pressing air cylinder used for driving the paper pressing mechanism to be close to the winding device and an installation base in linkage with the paper pressing air cylinder, a pressing rod is hinged to the bottom of the installation base, an elastic pressing wheel is arranged at one end of the pressing rod, and the elastic pressing wheel is located above the winding device. And an elastic piece is arranged between the other end of the pressing rod and the mounting seat. Through the compensation of the elastic piece to the pressing rod, even if the elastic pressing wheel touches the uneven surface of the wire, the insulating paper can be tightly pressed against the surface of the wire, the position of the insulating paper is kept unchanged all the time, and the yield of coil winding is improved.

The invention relates to the technical field of capacitor voltage transformers, in particular to a CVT state online monitoring method and device, electronic equipment and a storage medium, and the method comprises the steps: synchronously collecting secondary voltage signals of a three-phase CVT during normal operation; based on a Pisareenko harmonic decomposition method, main components of each phase of secondary voltage signal are extracted; acquiring secondary voltage characteristic data of each phase as a training sample according to the secondary voltage signal of each phase and the main component of the secondary voltage signal, and training a single-class support vector machine model according to the training sample; obtaining secondary voltage characteristic data of each phase of CVT in the current time period as a plurality of test samples of a primary test, and identifying an abnormal ratio of abnormal samples in the plurality of test samples based on a trained single-class support vector machine model; performing interval prediction on the abnormal ratio of multiple tests by adopting a linear regression algorithm to obtain a prediction interval; and giving an alarm for the abnormal ratio which is not in the prediction interval. The technical scheme is used for on-line monitoring of the CVT state, and monitoring can be carried out accurately and effectively.

The invention discloses an adjustable frame of a hydraulic lifting type hand fork truck, and relates to the field of distribution network equipment maintenance auxiliary tools, the adjustable frame comprises a hand fork truck frame, a manual hydraulic cylinder, a pedal plate, a crank arm grip, a main wheel, a cross beam, a chain and a pressure release valve, the side, away from the main wheel, of the bottom of the hand fork truck frame is fixedly provided with a supporting plate; a wheel groove is formed in the end, away from the hand forklift frame, of the supporting plate, an auxiliary wheel is arranged in the wheel groove in a rolling mode, and the upper portion and the lower portion of the auxiliary wheel protrude out of an upper opening and a lower opening of the wheel groove respectively. According to the invention, the size of the handcart frame is matched with the size of the voltage transformer handcart, so that the purpose of transporting the voltage transformer to the handcart for efficient replacement is achieved; the forklift frame is used for lifting equipment, so that the problem of labor waste is solved, the operation space of workers is optimized, the working risk caused by manual work is reduced, the working efficiency is improved, the power failure time of the equipment is shortened, and convenience is brought to the replacement work of the voltage transformer.

The application relates to the technical field of metrological calibration, and discloses a multi-voltage-grade capacitor current tester calibration method based on unified transformation ratio. The method comprises the following steps: screening unified transformation ratio parameters meeting range constraints and error constraints, obtaining a ratio difference parameter of a corresponding electromagnetic voltage transformer, obtaining a capacitance ratio difference correction factor, calculating conversion coefficients under each voltage grade, determining a primary side capacitance setting value according to a preset primary side calibration capacitance value and the conversion coefficients, obtaining a secondary side output capacitance value of a standard capacitance tank, and collecting a displayed capacitance value and a displayed capacitance current value. The conversion coefficients between the unified transformation ratio and the theoretical transformation ratios of each voltage grade are established, single transformation ratio is used to cover multi-voltage-grade calibration, error components introduced by the ratio difference of the electromagnetic voltage transformer in the capacitance calibration process are reduced, and different transformation ratio equipment needs to be frequently replaced.

The invention provides a hooking system for a capacitor voltage transformer test. The hooking system comprises a base, a lifting device, a first rotary telescopic device, a first hook, a first patch cord and a control module, the lifting device is used for driving the first rotary telescopic device to ascend and descend in the vertical direction. The first rotary telescopic device is used for driving the first hook to rotate in the vertical direction and driving the first hook to stretch out and draw back in the horizontal direction. The first end of the first patch cord is arranged on the base, and the second end of the first patch cord is connected with the first hook; and the control module is used for controlling the lifting device and the first rotary telescopic device, so that the first hook is hooked at a target position of the capacitor voltage transformer. According to the hooking system for the capacitor voltage transformer test, mechanical adjustment of the spatial position of the first hook is realized, so that the first hook is efficiently and safely hooked at the target position of the capacitor voltage transformer.

The invention discloses a pulsating voltage-based current transformer secondary circuit disconnection fault detection method, and belongs to the technical field of power distribution network fault detection. According to the invention, the correlation between the real-time voltage signal induced by the voltage transformer and the reference voltage is considered on the basis of the current transformer secondary circuit disconnection difference current criterion; the method has the core effects that the current transformer secondary circuit disconnection fault and the high-resistance grounding fault of the power transmission current are distinguished according to the pulsation rhythm with the specific length in the correlation coefficient between the real-time voltage signal and the reference voltage information, so that the small-amplitude sinusoidal current distinguishing capability of a power transformation secondary system device is improved; and the detection accuracy of the secondary circuit disconnection fault of the current transformer of the power transmission line is greatly improved.

Charging device comprising: a battery (106) suitable and configured to store DC voltage; first and second motors (101, 102) suitable and configured to operate as a motor or a generator; first and second inverters (103, 104) suitable and configured to operate the first and second motors (101, 102); a voltage transformer (105) suitable and configured to increase the DC voltage of the battery (106) to supply it to the first and second inverters (103, 104) and to increase the DC voltage of the inverter to supply it to the battery (106); and a charging controller (200) suitable and configured to operate the first and second inverters (103, 104) as a booster or generator.to operate voltage amplifiers or to operate the voltage transformer (105) as a step-down converter, according to a voltage which is input via a neutral point of the first and second motors (101, 102) and the voltage of the battery (106), wherein the charging control element (200) is configured to switch off the voltage transformer (105) so that the voltage which is increased by the first inverter (103) or the second inverter (104) charges the battery (106) when the voltage which is input via the neutral point of the first and second motors (101, 102) is less than the battery voltage.

The application relates to the technical field of electronic components, and discloses an anti-interference telescopic voltage transformer, which comprises an adjusting sleeve, a low-voltage capacitor voltage divider installed at the bottom of the adjusting sleeve and a high-voltage capacitor voltage divider arranged above the adjusting sleeve, and an adjusting tube is slidably inserted into the adjusting sleeve. The anti-interference telescopic voltage transformer is provided with a silicon rubber corrugated sleeve, which has excellent high-temperature resistance, corrosion resistance and elastic recovery performance, can form reliable sealing between the high-voltage capacitor voltage divider and the adjusting sleeve, does not interfere with the adjusting work of the high-voltage capacitor voltage divider, can block water, dust and foreign matters from entering the inside of the adjusting sleeve, and can avoid that impurities are stuck in the adjusting tube.

The utility model provides a kind of anti-collision voltage transformer, including inner support, the inner support has bottom plate, the top of the bottom plate is provided with support frame, the periphery of the bottom plate is all provided with vertical plate, the top of support frame is fixedly connected with the vertical plate, the top of the bottom plate is centrally provided with the voltage transformer body;The side of the vertical plate, away from the voltage transformer body, is supported with longitudinal support plate by elastic support mechanism, the longitudinal support plate is all uniformly provided with the horizontal support rod perpendicular to it, the side of the horizontal support rod, away from the longitudinal support plate, is fixedly provided with buffer strip;The utility model can physically protect voltage transformer, buffer energy absorption when collision occurs, and the periphery and top of voltage transformer body can be communicated with external heat dissipation.

The utility model belongs to the technical field of voltage transformers, and particularly relates to an outdoor 20-kilovolt lightweight voltage transformer. The transformer comprises a rectangular iron core on which a primary coil and a secondary coil are wound; a cast aluminum junction box is arranged on the side surface of the totally-closed shell; a stainless steel waterproof joint is arranged on one side of the totally-closed shell; a steel wire type lead sealing rope is fixedly arranged outside the cast aluminum junction box for locking; the primary coil is connected with an A-phase connecting line; the A-item connecting line is connected with an M10 primary bolt; the N-phase connecting line is connected to the M8N terminal bolt, the secondary coil is connected with two secondary an connecting lines, the two secondary an connecting lines are connected to the M6 secondary terminal bolt, and the front grounding connecting line is connected to the M8 grounding bolt. The anti-theft door is light in weight, high in protection performance, easy to install, high in anti-theft performance, high in reliability and good in safety and economical efficiency.