CN218470897U - Transformer core and partial discharge online monitoring device - Google Patents
Transformer core and partial discharge online monitoring device Download PDFInfo
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- CN218470897U CN218470897U CN202222215437.XU CN202222215437U CN218470897U CN 218470897 U CN218470897 U CN 218470897U CN 202222215437 U CN202222215437 U CN 202222215437U CN 218470897 U CN218470897 U CN 218470897U
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Abstract
The utility model relates to a transformer core and partial discharge on-line monitoring device, include: the iron core sensor is arranged on the transformer iron core grounding copper bar; the clamp sensor is arranged on the grounding copper bar of the transformer clamp; the partial discharge sensor is arranged on the transformer core grounding copper bar; the circuit board is provided with a processing unit, an iron core and clamping piece sensor sampling unit and a partial discharge sensor sampling unit which are connected with the processing unit; the utility model discloses collect transformer core current, folder electric current, transformer body partial discharge monitoring in an organic whole, the while is to the transformer operation core current, folder electric current and the inside online monitoring that discharges of transformer.
Description
Technical Field
The utility model relates to a transformer and reactor on-line monitoring and fault identification technical field, especially a transformer core and partial discharge on-line monitoring device.
Background
The power transformer is a core device in a power system, and the safe and stable operation of the power transformer is very important. With the rapid development of national economy, the demand of society for electric power is increasing, and the requirement for the reliability of electric power supply is stricter. The development process of the faults of the power transformer is closely related to the running environment and the load condition, the faults are difficult to find in time by adopting a regular maintenance method, the regular maintenance needs to be carried out off line, the power failure time is long, and a large amount of electric quantity loss can be caused.
At present, an online technology is widely applied to a transformer substation site, and the running state of a transformer is detected through an online monitoring technology. Through the combination of on-line monitoring and off-line maintenance, effective data support can be well provided for transformer fault diagnosis.
The existing transformer online monitoring technology is gradually mature, but most of the existing transformer online monitoring technologies are integrated, especially for the detection of transformer states such as transformer core leakage current, clamping piece leakage current, partial discharge and the like, only single parameters are detected, namely, the core current sensor, the clamping piece current sensor and the partial discharge sensor are respectively connected with respective monitoring terminals, and the acquired multi-channel sensor signals cannot be used in combination, and the transformer states cannot be comprehensively analyzed and diagnosed. And because the installation sensor type is more, leads to monitoring terminal numerous, has increaseed equipment cost and operation maintenance work.
Disclosure of Invention
In order to solve the problem, the utility model discloses insulating state and relation between electric current, folder electric current, the partial discharge unshakable in one's determination during to the transformer operation, provided a transformer core and partial discharge on-line monitoring device to solve all-round multi-parameter's transformer state on-line monitoring and failure diagnosis problem.
The device collects leakage current flowing through an iron core when the transformer operates, clamp current and partial discharge signals generated by a transformer body through the iron core current sensor, the clamp current sensor and the partial discharge sensor, the signal processing unit amplifies and filters the collected current and the partial discharge signals, the signals are subjected to digital processing through the analog-digital conversion unit, the core processing unit calculates the collected signal size respectively, and the core processing unit performs comprehensive judgment on the insulation operation state of the transformer by combining current parameters and partial discharge parameters.
The technical scheme adopted by the invention for realizing the purpose is as follows: transformer core and partial discharge on-line monitoring device includes:
the iron core sensor is arranged on the transformer iron core grounding copper bar;
the clamp sensor is arranged on the grounding copper bar of the transformer clamp;
the partial discharge sensor is arranged on the transformer core grounding copper bar;
the circuit board is provided with a processing unit, and an iron core, clamping piece sensor sampling unit and a partial discharge sensor sampling unit which are connected with the processing unit;
the iron core and clamping piece sensor sampling unit comprises an analog signal switch unit, a signal amplification unit, a first filtering sampling unit and a second filtering sampling unit;
the iron core sensor and the clamp sensor are respectively connected with two input ends of the analog signal switch unit, an enabling signal end and a channel selection input end of the analog signal switch unit are connected with the processing unit, and an output end of the analog signal switch unit is connected with an input end of the signal amplification unit; the gain input end of the signal amplification unit is connected with the processing unit, and the output end of the signal amplification unit is respectively connected with the first filtering sampling unit and the second filtering sampling unit; the first filtering sampling unit and the second filtering sampling unit are connected with the processing unit;
the partial discharge sensor is connected with the partial discharge sensor sampling unit.
The first filtering and sampling unit comprises a first filtering unit and a first AD sampling unit which are connected in sequence, the first filtering unit is connected with the signal amplification unit, and the first AD sampling unit is connected with the processing unit.
The second filtering and sampling unit comprises a second filtering unit, a square wave conversion unit and an isolation unit which are connected in sequence, the second filtering unit is connected with the signal amplification unit, and the isolation unit is connected with the processing unit.
The first filtering unit and the second filtering unit adopt an operational amplifier U1;
the inverting input end of the operational amplifier U1 is grounded through a resistor R28, and is connected with the output end of the signal amplification unit sequentially through a resistor R23, a capacitor C22 and a resistor R30, the inverting input end is connected with the output end of the operational amplifier U1 through a resistor R23, and the output end of the operational amplifier U1 is connected with the first AD sampling unit or the square wave conversion unit through a resistor R29;
the positive input end of the operational amplifier U1 is grounded through a capacitor C29 and is also connected with a node among a resistor R31, a resistor R30 and a capacitor C22 through a resistor R31.
The analog signal switch unit adopts an analog switch chip U11, two input ends of the analog switch chip U11 are respectively connected with the iron core sensor and the clamp sensor, the enabling signal end and the channel selection input end are respectively connected with the processing unit through a resistor R1 and a resistor R2, and the output end is connected with the signal amplification unit.
The partial discharge sensor sampling unit comprises a signal processing unit, a signal isolation unit and a second AD sampling unit which are sequentially connected; the partial discharge sensor is connected with the signal processing unit, and the second AD sampling unit is connected with the processing unit.
The processing unit comprises a first processing unit and a second processing unit;
the first processing unit is connected with the analog signal switch unit, the signal amplification unit, the first AD sampling unit and the isolation unit;
the second processing unit is connected with the second AD sampling unit.
The first processing unit is connected with a first data communication unit and a state display unit.
The second processing unit is connected with a second data communication unit and a state indicating unit.
The iron core sensor and the clamping piece sensor both adopt a through type current sensor.
The invention has the following beneficial effects and advantages:
1. the transformer core and partial discharge online monitoring device integrates transformer core current, clamp current and transformer body partial discharge monitoring, and can simultaneously perform online monitoring on the transformer core current, the clamp current and the transformer internal discharge during operation.
2. Through the collection of various sensors and corresponding processing circuits, the on-line monitoring of the state of the transformer in all directions is realized according to the monitored iron core current, the monitored clamp current and the monitored high-frequency partial discharge data in the transformer, the current insulation operation state of the transformer is judged, the judgment accuracy of the operation state of the transformer is effectively improved, and accurate and effective data support is provided for the safe and reliable operation of the transformer.
3. The utility model discloses can realize the monitoring of many parameters, for the individual monitoring of a plurality of sensor list parameters, many parameter data can carry out the analysis each other, combine three kinds of data to judge transformer running state, and data are more reliable in trouble early warning and judgement, reduce the influence of error in the monitoring of single parameter, avoid the trouble and the wrong report that great error produced.
4. The utility model discloses a plurality of sensors, with the processing circuit integration of different sensors on a circuit board, not only can detect the many parameters of transformer state simultaneously, monitor terminal significantly reduces moreover, has reduced equipment cost, the operation maintenance of being more convenient for.
5. The utility model discloses an analog signal switch realizes the signal switching of iron core sensor and folder sensor, not only can gather different sensor signal, has reduced the quantity of the corresponding processing circuit of single sensor moreover, and then has reduced circuit board space size and raw and other materials cost, realizes that the omnidirectional carries out on-line monitoring in order to be used for failure analysis and diagnosis to the transformer state.
Drawings
FIG. 1 is a schematic structural diagram of a transformer core and a partial discharge online monitoring device;
1 iron core sensor, 2 clamping piece sensor, 3 analog signal switch, 4 signal amplifying unit, 5 first filtering unit, 6 second filtering unit, 7 first AD sampling unit, 8 square wave converting unit, 9 isolating unit, 10 first core processing unit, 11 a first data communication unit, 12 a state display unit, 13 a partial discharge sensor, 14 a signal processing unit, 15 a signal isolation unit, 16 a second AD sampling unit, 17 a second core processing unit, 18 a second data communication unit and 19 a state indicating unit;
FIG. 2 is a circuit diagram of a filter unit;
FIG. 3 is a circuit diagram of an analog signal switching unit;
fig. 4 is a circuit diagram of an isolation cell.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
To make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is given for further details of the present invention with reference to the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention, and are not intended to limit the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the transformer core and partial discharge online monitoring device includes a core sensor unit, a clamp sensor unit, an analog signal switch unit, a signal amplification unit, a filtering unit 1, a filtering unit 2, an AD sampling unit 1, a square wave conversion unit, an isolation unit, a core processing unit 1, a data communication unit 1, a state display unit, a partial discharge sensor unit, a signal processing unit, a signal isolation unit, an AD sampling unit 2, a core processing unit 2, a data communication unit 2, and a state indication unit. The current running state of the transformer is judged by processing and calculating signals acquired by the iron core sensor, the clamping piece sensor and the partial discharge sensor, so that the safe and stable running of the transformer is ensured.
The output of the signal amplification unit is connected with two channels of a first filtering sampling unit and a second filtering sampling unit. The first filtering and sampling unit comprises a filtering unit 1 and an AD sampling unit 1, and the second filtering and sampling unit comprises a filtering unit 2, a square wave conversion unit and an isolation unit; in order to reduce the space of a hardware circuit board, reduce the types of components and parts, reduce the hardware cost and complete multi-parameter monitoring. The signal amplification unit, the first filtering and sampling unit and the second filtering and sampling unit jointly complete the processing and sampling of the iron core current signal and the clamp current signal. The iron core current signal and the clamp current signal sequentially and respectively pass through two paths, and are subjected to signal filtering and analog-to-digital conversion through the first filtering and sampling unit and signal filtering, square wave conversion and signal isolation through the second filtering and sampling unit. And the core processing unit 1 performs analog-to-digital conversion on the signal output by the first sampling unit according to the frequency signal output by the second filtering sampling unit, so as to complete signal acquisition. Therefore, the processing and sampling of the iron core current signal and the clamp current signal are realized, and the online monitoring of the two parameters is realized.
The iron core sensor and the clamping piece sensor are of a through structure, are of a type BNWXL-60W and are fixed on the transformer iron core and the clamping piece grounding copper bar. The sensor adopts permalloy with low loss as an iron core, has a unique depth negative feedback technology, has an automatic compensation function, has a current detection range of 0-30A, a phase transformation error of not more than 0.01 degrees, does not change the grounding mode of an iron core copper bar and a clamping piece copper bar in a feed-through mode, and has higher structural reliability.
The analog signal switch unit adopts an ADG1219 chip and has ultra-low capacitance and extremely-low charge injection characteristics. Two paths of signal inputs are supported and respectively connected with an output signal of the iron core sensor and an output signal of the clamp sensor. The core control unit 1 selects the output types of the two paths of signals through the control channel selection input end. And a signal acquisition unit is realized to acquire two parameter signals of the iron core current and the clamp current.
The signal amplification unit adopts a program control amplifier chip, and the processing unit selects the amplification factor by controlling an amplifier gain pin. The programmable amplifier has the advantages of high precision, programmable gain control and the like, can amplify signals according to different signal grades, has the highest amplification gain of 1000 times, and has extremely low offset voltage, drift and high common-mode rejection ratio. The front end of the signal amplification unit is connected with the analog switch unit, and the rear end of the signal amplification unit is respectively connected with the filtering unit 1 and the filtering unit 2.
As shown in fig. 2, the filtering unit 1 and the filtering unit 2 both adopt a second-order filtering network composed of operational amplifiers to filter the signal output by the signal amplifying unit. The filtering cut-off frequency can be changed by matching different resistance values and capacitance values of the resistor, so as to adapt to the requirements of frequency parameter measurement and harmonic parameter measurement. An active second-order filter circuit composed of a resistor, a capacitor and an operational amplifier and a matching resistor and capacitor value are the prior art. In the embodiment, the filtering cutoff frequency of the filtering unit 1 is 15kHz, and the output is connected with the AD sampling unit 1; the filtering cut-off frequency of the filtering unit 2 is 50Hz, and the output is connected with the square wave conversion unit.
And the AD sampling unit 1 is used for performing analog-to-digital conversion on the signal processed by the filtering unit 1. The chip selects AD7606, supports 8 paths of signal input, simulates input impedance of 1M omega, has sampling rate of 200k, and has the oversampling function of a digital filter. The core processing unit 1 controls the AD sampling unit 1 to complete analog-to-digital conversion and data reading.
The square wave conversion unit is used for realizing the conversion from a sinusoidal voltage signal to a square wave signal by designing a hysteresis comparator circuit through a voltage comparator in the prior art. The square wave conversion unit is connected with the filtering unit 2, and performs squaring processing on the signal processed by the filtering unit 2. The hysteresis comparator effectively solves the problem of influence of input signal fluctuation and interference on frequency measurement, and improves signal monitoring precision.
As shown in fig. 4, the isolation unit uses a high-speed optical coupler to isolate the square wave signal output by the square wave conversion, and convert the signal level. The rear end is connected with the core processing unit 1, so that the damage to the core processing unit 1 caused by overhigh output level of the square wave conversion unit is avoided.
The core processing unit 1 adopts an STM32F429 core processor, and the maximum working frequency of the processor is higher than 180MHz. A Cortex-M4 kernel is adopted to support Floating Point Unit (FPU) operation. The I/O port with up to 168 interrupt functions integrates a plurality of modules such as a timer, a memory, an ADC, a DAC, a clock, a communication unit and the like. The core processor unit 1 is mainly used for controlling and calculating the collection of the core current and the clamp current. And the AD sampling unit 1, the isolation unit, the data communication unit 1 and the state display unit are connected.
The data communication unit 1 and the data communication unit 2 adopt an RS485 communication mode, select an RS485 module with an isolation function, and integrate an isolation DC-DC circuit, a signal isolation circuit, an RS-485 bus transceiver circuit and a bus protection circuit inside. The method has high integration level and reliability, and effectively solves the problems of bus interference, communication abnormity and the like. The data communication 1 unit is connected with the core processor unit 1 to realize the transmission of the current data of the iron core and the clamping piece. The data communication unit 2 is connected with the core processor unit 2 to realize the transmission of the partial discharge data.
And the state display unit selects an industrial touch screen and displays the acquired data and the current device running state in real time. And a parameter setting function is supported, and a user can complete the operation through an operation screen. The status display unit is connected to the core processor unit 1.
And the partial discharge sensor unit is a high-frequency partial discharge sensor with the model of BNWHF-60, and the sensor is designed in a clamp mode and is fixed on a transformer core grounding copper bar. The partial discharge sensor shell is made of cast aluminum materials, the outer side of the partial discharge sensor shell is of an inner circle structure, and the partial discharge sensor is composed of a magnetic core, a high-frequency coil, a filtering and sampling unit and an electromagnetic shielding box. The frequency band detection range is 1MHz-20MHz, and the minimum detectable sensitivity is 1pC.
The signal processing unit is connected with the partial discharge sensor unit and is used for carrying out range conversion processing and filtering processing on the signals output by the sensor so as to enable the signals to meet the acquisition standard.
The signal isolation unit adopts a signal isolation transformer, the front end is connected with the signal processing unit, and the rear end is connected with the AD adoption unit 2. Through isolation processing, mutual independence between front and back unit signals is guaranteed, interference is reduced, and monitoring precision is improved.
The front end of the AD sampling unit 2 is connected with the signal isolation unit, an AD9633 chip is adopted, four independent sampling channels are arranged, the sampling rate is up to 100M, the resolution ratio is 12bit, and the rear end of the AD sampling unit is connected with the processor unit 2. The AD adopts the unit 2 to realize the digital processing of the partial discharge analog signal.
The core processor 2 unit adopts an FPGA core processor, selects a Spartan-6 series chip of Xilinx company, has the model of XC7Z020 and ARMv7-A architecture, is an application processor unit based on dual-core ARM Cortex-A9, and has the maximum clock frequency of 667.0MHz. The collection and calculation of the partial discharge signals are mainly completed. And is connected with the AD sampling unit 2, the data communication unit 2 and the state indicating unit.
And the state indicating unit adopts an LED indicating lamp to display the running state, the data transmission state and the fault state of the device.
As shown in FIG. 2, in the filtering unit 1, the output signal of the signal amplifying unit is connected to one end of a resistor R30, the other end of R30 is respectively connected to one ends of resistors R31 and C22, and the other end of R31 is connected to a third pin of an operational amplifier U1 and is also connected to one end of C29. The other end of C22 is connected to one end of R23 and the sixth pin of the operational amplifier U1, and the other end of C29 is connected to the ground. The other end of R23 is connected with one end of R28, and then is connected to a second pin of the operational amplifier U1. The other end of R28 is grounded. An active second-order filter network is formed by a resistor, a capacitor and an operational amplifier U1, filtering processing is carried OUT on an input signal, and a filtered signal OUT1 is output through a sixth pin of the U1. The circuit consists of two stages of RC filter circuits and an in-phase operational amplifier circuit, and negative feedback is added between the output of the operational amplifier and the in-phase input of the integrated operational amplifier. The resistors R30 and R31, the capacitors C22 and C29 set the cut-off frequency of the second-order active filter circuit, and the resistors R23 and R28 set the pass-band gain of the circuit. When the frequency of the input signal is greater than the set cut-off frequency, the feedback signal weakens the input signal due to the action of the negative feedback circuit, and the filtering function of the signal is realized. The filtering unit filters noise signals doped in the iron core current signal and the clamp current signal, two parameter signals are processed, and the accuracy of multi-parameter signal acquisition is guaranteed.
As shown in fig. 3, the analog signal switch unit employs an analog switch ADG1219, and a core sensor output signal sensor 1 is connected to the seventh pin of U11 through a resistor R3. The clip sensor output signal sensor 2 is connected to the fifth pin of U11 through a resistor R5. The chip enable signal EN is connected to the first pin of U11 through R1, and the enable signal EN is connected with the core processing unit 1. The sixth pin is a signal output pin and is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with a sensor _ OUT and a signal amplifying unit. The chip channel selection signal Select _ IN is connected to the eighth pin of U11 through R2, and the channel selection signal Select _ IN is connected to the core processing unit 1. The +12V power supply is connected to the second pin of the U11 and is grounded through the capacitor C1. the-12V power supply is connected to the fourth pin of U11 and is connected to the ground through C2. The core processing unit 1 controls the operating state of the U11 through the EN enable signal. When the enable signal is at a high level, the U11 operates; when the enable signal is low, U11 does not operate. The core processing unit 1 selects the core signal and the clip signal by the channel selection signal Select _ IN. When the channel selection signal is low, the core sensor output signal sensor 1 is turned on to the circuit. When the channel select signal is high, the clamp sensor output signal sensor 2 is turned on to the circuit. The input types of the iron core signal and the clamp signal can be selected through the analog signal switch. The signal sampling unit is realized, the signal acquisition of two parameters of the iron core current and the clamp current is completed, the number of hardware components is reduced, and the hardware cost is reduced.
As shown in fig. 4, the isolation unit adopts a high-speed optocoupler 6N137, and the output signal of the square wave conversion unit is connected to one end of resistors R50 and D4 and is connected to a third pin of the high-speed optocoupler U2. The other end of D4 is grounded, the other end of R50 is connected to +5V of a power supply and is also connected to one end of C30, and the other end of C30 is connected to the ground. Resistor R51 is connected to +5V power supply at one end and to the second pin of U1 at the other end. The fifth pin of U1 is grounded, the sixth pin is a processed signal output pin and is connected to one end of R52 and one end of C31, the other end of R52 is connected to a power supply VDD3.3V, and the other end of C31 is grounded. The seventh pin and the eighth pin are connected to a power supply vdd3.3v. And a light emitting diode and a phototransistor are integrated in the high-speed optocoupler U2. When the square wave conversion unit outputs a low level to the isolation unit, current flows through the light emitting diode inside the U2 to form a light source, the current is generated on the photoelectric transistor at the output end, and the high-speed optical coupler output transistor reversely outputs the low level. Otherwise, a high level is output. The isolation unit output level characteristics are the same as the processing unit. Therefore, the isolation unit effectively isolates the input signal from the output signal, and avoids the damage of the core processor unit due to overlarge signal voltage. The isolation unit realizes a circuit to complete the isolation processing of two parameters of the iron core frequency signal and the clamping piece frequency signal.
The utility model discloses the processing unit isotructure that well involves is conventional selection, just the utility model discloses do not have the innovation in software and programming, only protect hardware connection relation and position relation isotructure technical characteristics, the technical staff in the field passes through the utility model discloses the structural characteristics who records in, combine conventional programming logic to realize the utility model discloses the function solves the utility model discloses technical problem.
Claims (10)
1. Transformer core and partial discharge on-line monitoring device, its characterized in that includes:
the iron core sensor is arranged on the transformer iron core grounding copper bar;
the clamp sensor is arranged on the grounding copper bar of the transformer clamp;
the partial discharge sensor is arranged on the transformer core grounding copper bar;
the circuit board is provided with a processing unit, an iron core and clamping piece sensor sampling unit and a partial discharge sensor sampling unit which are connected with the processing unit;
the iron core and clamping piece sensor sampling unit comprises an analog signal switch unit, a signal amplification unit, a first filtering sampling unit and a second filtering sampling unit;
the iron core sensor and the clamp sensor are respectively connected with two input ends of the analog signal switch unit, an enabling signal end and a channel selection input end of the analog signal switch unit are connected with the processing unit, and an output end of the analog signal switch unit is connected with an input end of the signal amplification unit; the gain input end of the signal amplification unit is connected with the processing unit, and the output end of the signal amplification unit is respectively connected with the first filtering sampling unit and the second filtering sampling unit; the first filtering sampling unit and the second filtering sampling unit are connected with the processing unit;
the partial discharge sensor is connected with the partial discharge sensor sampling unit.
2. The on-line monitoring device for transformer core and partial discharge according to claim 1, wherein the first filtering and sampling unit comprises a first filtering unit and a first AD sampling unit, which are sequentially connected, the first filtering unit is connected with the signal amplifying unit, the first AD sampling unit is connected with the processing unit, and the first filtering unit employs an operational amplifier U1.
3. The transformer core and partial discharge online monitoring device according to claim 1, wherein the second filtering and sampling unit comprises a second filtering unit, a square wave converting unit and an isolating unit, which are connected in sequence, the second filtering unit is connected with the signal amplifying unit, the isolating unit is connected with the processing unit, and the second filtering unit adopts an operational amplifier U1.
4. The transformer core and partial discharge online monitoring device according to claim 2 or 3, wherein an inverting input terminal of the operational amplifier U1 is grounded through a resistor R28, and is further connected to an output terminal of the signal amplification unit through a resistor R23, a capacitor C22 and a resistor R30 in sequence, the inverting input terminal is further connected to an output terminal of the operational amplifier U1 through a resistor R23, and the output terminal of the operational amplifier U1 is connected to the first AD sampling unit or the square wave conversion unit through a resistor R29;
the positive input end of the operational amplifier U1 is grounded through a capacitor C29 and is also connected with a node among a resistor R31, a resistor R30 and a capacitor C22 through a resistor R31.
5. The on-line monitoring device for transformer cores and partial discharges according to claim 3, wherein the analog signal switch unit is an analog switch chip U11, two input terminals of the analog switch chip U11 are respectively connected to the core sensor and the clip sensor, the enable signal terminal and the channel selection input terminal are respectively connected to the processing unit through a resistor R1 and a resistor R2, and the output terminal is connected to the signal amplification unit.
6. The transformer core and partial discharge online monitoring device according to claim 1, wherein the partial discharge sensor sampling unit comprises a signal processing unit, a signal isolation unit, and a second AD sampling unit, which are sequentially connected; the partial discharge sensor is connected with the signal processing unit, and the second AD sampling unit is connected with the processing unit.
7. The transformer core and partial discharge online monitoring device according to claim 1, wherein the processing unit comprises a first processing unit and a second processing unit;
the first processing unit is connected with the analog signal switch unit, the signal amplification unit, the first AD sampling unit and the isolation unit;
the second processing unit is connected with the second AD sampling unit.
8. The on-line transformer core and partial discharge monitoring device according to claim 7, wherein the first processing unit is connected to a first data communication unit and a status display unit.
9. The transformer core and partial discharge online monitoring device according to claim 7, wherein the second processing unit is connected with a second data communication unit and a status indication unit.
10. The transformer core and partial discharge online monitoring device according to claim 1, wherein the core sensor and the clip sensor are all feedthrough current sensors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222215437.XU CN218470897U (en) | 2022-08-22 | 2022-08-22 | Transformer core and partial discharge online monitoring device |
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| CN202222215437.XU CN218470897U (en) | 2022-08-22 | 2022-08-22 | Transformer core and partial discharge online monitoring device |
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| CN218470897U true CN218470897U (en) | 2023-02-10 |
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