CN212301747U - High-voltage cable sheath grounding circulation on-line monitoring terminal and on-line monitoring system - Google Patents
High-voltage cable sheath grounding circulation on-line monitoring terminal and on-line monitoring system Download PDFInfo
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- CN212301747U CN212301747U CN202020743813.0U CN202020743813U CN212301747U CN 212301747 U CN212301747 U CN 212301747U CN 202020743813 U CN202020743813 U CN 202020743813U CN 212301747 U CN212301747 U CN 212301747U
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Abstract
The utility model discloses a high tension cable sheath ground connection circulation on-line monitoring terminal and on-line monitoring system, this monitoring terminal can realize the real-time on-line measuring of cable ground connection circulation through installation open-close type current transformer and data processing transmission equipment, and the built-in wireless communication device of data processing transmission equipment, can realize data wireless transmission, the wiring difficulty of having avoided wired mode to bring, the big scheduling problem of potential safety hazard, whole monitoring terminal simple structure, safety and reliability, more be fit for popularizing and applying on a large scale. The system not only can realize the detection of the cable grounding circulation, but also can realize the real-time monitoring of the temperature and the humidity around the cable, the monitoring data is more various, and various monitoring data can be uploaded to the server and displayed for a user through user terminal equipment, the remote online monitoring of the high-voltage cable is realized, the system is efficient and reliable in work, and the requirements of people on the multi-parameter online monitoring of the cable can be more met.
Description
Technical Field
The utility model relates to a power cable and circulation monitoring technology field, more specifically the saying so relates to a high tension cable sheath ground connection circulation on-line monitoring terminal and on-line monitoring system.
Background
At present, along with the continuous expansion of the laying area of a power grid, the problem of power safety is valued by more and more people, a cable is an indispensable connecting piece in the laying process of a power facility, a high-voltage cable adopts a single-core structure, and when an access is formed between a metal sheath and the ground, induced voltage is easy to appear on the metal sheath, when the metal sheath and the ground form an access, the circulation generated on the metal sheath can reach a higher value, the sheath generates heat, the current-carrying capacity of the cable in operation is reduced, and the like, the cable insulation aging can be caused by the overheating of the metal sheath, the safe operation of the cable is threatened, and the circulation monitoring of the cable sheath becomes an important link in the power maintenance work.
However, in the existing cable sheath circulation monitoring process, data are mostly obtained by actually measuring the data by using a pincer-shaped ammeter when an operator arrives at a site, and the method needs to consume a large amount of manpower and material resources and has low detection efficiency. In order to improve the detection efficiency, some grounding circulation on-line monitoring devices appear on the market, but the devices can only monitor one cable parameter of the grounding circulation generally, the functions are single, most of the data transmission of the existing grounding circulation on-line monitoring devices adopts a wired mode, field data lines and communication lines are more, the wiring is very difficult, the requirement on electric power safety is difficult to achieve, and the practicability is not strong.
Therefore, how to provide a safe, efficient and fully functional ground connection circulation on-line monitoring system is a problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a high tension cable sheath ground connection circulation on-line monitoring terminal and on-line monitoring system, this terminal can realize the on-line monitoring to cable ground connection circulation, and data transmission adopts wireless mode, and monitoring system not only can monitor the ground connection circulation simultaneously, can also monitor the humiture information around the cable, has solved current monitoring mode function singleness, security performance and has been difficult to ensure the scheduling problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
on one hand, the utility model provides a high tension cable sheath ground connection circulation on-line monitoring terminal, this monitoring terminal includes open-close type current transformer, data processing transmission equipment and power supply, open-close type current transformer cover is located the cable earth connection, open-close type current transformer with the data processing transmission equipment electricity is connected, power supply is for data processing transmission equipment and open-close type current transformer power supply;
the data processing and transmitting equipment comprises a shell, a circulation detection circuit, a microprocessor and a wireless communication device, wherein the circulation detection circuit, the microprocessor and the wireless communication device are packaged in the shell, the open-close type current transformer is electrically connected with the circulation detection circuit, the circulation detection circuit is electrically connected with the microprocessor, the microprocessor is electrically connected with the wireless communication device, and the power supply is electrically connected with the microprocessor.
The utility model has the advantages that: the monitoring terminal can realize real-time online measurement of cable grounding circulation by installing the open-close type current transformer and the data processing transmission equipment, the wireless communication device is arranged in the data processing transmission equipment, wireless data transmission can be realized, the problems of difficult wiring, large potential safety hazard and the like caused by a wired mode are avoided, and the whole monitoring terminal is simple in structure, safe and reliable and is more suitable for large-scale popularization and application.
Furthermore, the loop current detection circuit comprises a current induction coil, a resistor and a voltage measurement module, wherein the current induction coil is electrically connected with the current transformer, the current induction coil is also connected with the resistor in parallel, the parallel circuit of the current induction coil and the resistor is electrically connected with the input end of the microprocessor, the voltage measurement module is electrically connected with two ends of the resistor, and the voltage measurement module is also electrically connected with the microprocessor.
Furthermore, a plurality of interfaces are formed in one side wall of the casing, each interface comprises a power supply interface, a current transformer interface, a communication interface and an optical fiber interface, the power supply is electrically connected with the microprocessor through the power supply interface, the plurality of open-close type current transformers are electrically connected with the circulation detection circuit through the current transformer interfaces respectively, the communication interfaces are used for transmitting data with external equipment, and the optical fiber interfaces are used for being connected with the external equipment through optical fiber cables. The data processing transmission equipment is connected with the external device in an interface mode, one data processing transmission equipment can be connected with a plurality of current transformers, the installation is simple and convenient, and the monitoring efficiency is greatly improved.
On the other hand, the utility model also provides a high-voltage cable sheath grounding circulation on-line monitoring system, which comprises user terminal equipment, a server, a temperature sensor, a humidity sensor and the high-voltage cable sheath grounding circulation on-line monitoring terminal;
the temperature sensor and the humidity sensor are all installed at positions close to the high-voltage cable, the high-voltage cable sheath grounding circulation on-line monitoring terminal, the temperature sensor and the humidity sensor are all in communication connection with the server, and the server is also in communication connection with the user terminal equipment.
The utility model has the advantages that: the system not only can realize the detection of the cable grounding circulation, but also can realize the real-time monitoring of the temperature and the humidity around the cable, the monitoring data is more various, and various monitoring data can be uploaded to the server and displayed for a user through user terminal equipment, the remote online monitoring of the high-voltage cable is realized, the system is efficient and reliable in work, and the requirements of people on the multi-parameter online monitoring of the cable can be more met.
Further, the above-mentioned high-voltage cable sheath grounding circulation on-line monitoring system further includes a partial discharge detection device, the partial discharge detection device is installed at a position close to the high-voltage cable, and the partial discharge detection device is further in communication connection with the server. In order to make system monitoring data more comprehensive, the utility model discloses still add and establish partial discharge detection device, can the on-line monitoring high tension cable's the partial discharge condition, furthest's assurance high tension cable's work safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-voltage cable sheath grounding loop on-line monitoring terminal provided by the present invention;
fig. 2 is a schematic structural diagram of a data processing transmission device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a circulation detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a high-voltage cable sheath grounding loop on-line monitoring system according to the present invention;
fig. 5 is a schematic diagram of the structural architecture and the working principle of the temperature sensor according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a principle of generating a partial discharge phenomenon of a cable according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a principle of detecting partial discharge of a cable body according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a principle of detecting partial discharge of a ground wire connected to a cable according to an embodiment of the present invention;
fig. 9 is a schematic view of an application state of the partial discharge detection apparatus according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
On the one hand, referring to fig. 1 and fig. 2, the embodiment of the utility model discloses a high tension cable sheath ground connection circulation on-line monitoring terminal, include: the system comprises an open-close type current transformer 11, data processing and transmitting equipment 12 and a power supply 13, wherein the open-close type current transformer 11 is sleeved on a cable grounding wire, the open-close type current transformer 11 is electrically connected with the data processing and transmitting equipment 12, and the power supply 13 supplies power to the data processing and transmitting equipment 12 and the open-close type current transformer 11;
the data processing and transmitting device 12 includes a housing 121, and a loop current detection circuit 122, a microprocessor 123 and a wireless communication device 124 which are enclosed in the housing 121, wherein the open-close type current transformer 11 is electrically connected with the loop current detection circuit 122, the loop current detection circuit 122 is electrically connected with the microprocessor 123, the microprocessor 123 is electrically connected with the wireless communication device 124, and the power supply 13 is electrically connected with the microprocessor 123.
In this embodiment, the wireless communication device is implemented by using a low-power-consumption GPRS wireless communication module, which is a data communication product developed based on a GPRS network and is mostly installed in the monitoring substation. The field equipment of the monitoring substation is interconnected with the monitoring center through the GPRS module, and data is transmitted remotely, so that the communication between the monitoring substation and the monitoring center is realized. The GPRS communication module is widely applied to the industries of water conservancy, petroleum, heating power, environmental protection, electric power and the like.
In this embodiment, the power supply is supplied by a 9-30V dc power supply, and in consideration of the energy saving and environmental protection requirements of the monitoring terminal, the power supply can be supplied by a solar cell panel, and of course, a wind power supply and a hybrid power supply mode can be selected according to the environmental conditions of the use area, and specifically, the power supply can be set reasonably according to the actual demand, so as to ensure stable operation of new energy power supply, a low-power-consumption GPRS communication module can be selected, and thus the output power consumption requirement of new energy power supply is reduced.
Specifically, the open-close type current transformer 11 is sleeved outside the high-voltage cable to be detected and fixed by a rubber gasket 111 and a fastening hoop 112. When the open-close type current transformer is installed, the cross section of the open-close type current transformer is matched as closely as possible, the phenomena of staggering and misalignment cannot occur, the open-close type current transformer needs to be grounded strictly, a special cable is needed for the open-close type current transformer cable, and the length is preferably within 5 m. The data processing and transmission device is installed as close to the open-close type current transformer as possible, and the length of the cable is recommended not to exceed 5 m.
The microprocessor in this embodiment may be a REPROME single chip. Because the internal hardware is all miniaturized devices, the size of the whole data processing transmission equipment is only 280mm multiplied by 200mm multiplied by 60 mm.
In a specific embodiment, referring to fig. 3, the circulating current detecting circuit 122 includes a current sensing coil 1221, a resistor 1222, and a voltage measuring module 1223, the current sensing coil 1221 is electrically connected to the open-close type current transformer 11, the current sensing coil 1221 is further connected in parallel to the resistor 1222, the parallel circuit of the current sensing coil 1221 and the resistor 1222 is electrically connected to the input terminal of the microprocessor 123, the voltage measuring module 1223 is electrically connected to both ends of the resistor 1222, and the voltage measuring module 1223 is further electrically connected to the microprocessor 123.
In the embodiment, a 100:1 current induction coil is connected in parallel with a linear 10-ohm resistor, current collected by a 2.5VA open-close type current transformer is converted into small current of 1-5 milliamperes required by a microprocessor, voltage signals are collected through voltage measurement modules at two ends of the resistor, the collected current and voltage signals are calculated by the microprocessor to obtain an induction voltage value and a ground loop current value, and the induction voltage value and the ground loop current value are transmitted to a background for display through an IEC61850 communication protocol and a 485 bus.
In the embodiment, the voltage measuring module adopts a voltage measuring meter and is configured to be DM7275-03 in model number.
In a specific embodiment, a plurality of interfaces are disposed on a side wall of the casing 121, and each interface includes a power supply interface, a current transformer interface, a communication interface and an optical fiber interface, the power supply 13 is electrically connected to the microprocessor 123 through the power supply interface, the plurality of open-close current transformers 11 are electrically connected to the circulation detection circuit 122 through the current transformer interfaces, respectively, the communication interface is used for transmitting data with an external device, and the optical fiber interface is used for connecting to the external device through an optical fiber cable.
In this embodiment, a 4-channel 0-5A standard alternating current effective value real-time monitoring interface, i.e., a current transformer interface, is arranged on the housing, the accuracy can reach 0.5 level, each data processing and transmitting device can monitor the monitored current of at most 4 channels in real time, that is, one data processing and transmitting device can be connected with a 4-channel open-close type current transformer, and the data monitoring efficiency is greatly improved.
In this embodiment, in order to guarantee monitor terminal's security, data processing transmission equipment's casing adopts the explosion-proof material of extra, and the influence of external adverse circumstances is difficult for receiving to the internal circuit device, and the security performance is higher.
On the other hand, referring to fig. 4, the embodiment of the present invention further discloses an on-line monitoring system for high voltage cable sheath grounding loop, which includes a user terminal device 2, a server 3, a temperature sensor 4, a humidity sensor 5 and the above-mentioned on-line monitoring terminal 1 for high voltage cable sheath grounding loop;
the temperature sensor 4 and the humidity sensor 5 are both installed at positions close to the high-voltage cable, the high-voltage cable sheath grounding circulation on-line monitoring terminal 1, the temperature sensor 4 and the humidity sensor 5 are all in communication connection with the server 3, and the server 3 is also in communication connection with the user terminal equipment 2.
Specifically, referring to fig. 5, in this embodiment, a distributed optical fiber sensor based on diffuse reflection is used for measuring temperature, and devices required in the temperature measurement process specifically include a laser, a wavelength division multiplexer, a sensing optical fiber, a weak signal detector, a driving circuit, and a signal acquisition and control circuit, where the driving circuit is electrically connected to the laser, the laser is electrically connected to the wavelength division multiplexer, the wavelength division multiplexer is connected to the sensing optical fiber, the wavelength division multiplexer is further electrically connected to the weak signal detector, and both the driving circuit and the weak signal detector are electrically connected to the signal acquisition and control circuit.
The driving circuit drives the laser to emit a narrow pulse width laser pulse, the laser pulse is transmitted forwards along the sensing optical fiber after passing through the wavelength division multiplexer, the laser pulse interacts with optical fiber molecules to generate a plurality of weak backscattering, including Rayleigh (Rayleigh) scattering, Brillouin (Brillouin) scattering, Raman (Raman) scattering and the like, wherein the Raman scattering is to generate temperature insensitive Stokes (Anti-Stokes) light and temperature sensitive Anti-Stokes (Anti-Stokes) light due to the thermal vibration of the optical fiber molecules, the wavelengths of the two are different, and the two are detected by a high-sensitivity weak signal detector after being separated by the wavelength division multiplexer. The Anti-Stokes light intensity in the optical fiber is modulated by the external temperature, and the light intensity ratio of the Anti-Stokes to the Stokes accurately reflects the temperature information; the time for returning the Raman scattering signals at different positions to the weak signal detector is different, the optical fiber position corresponding to the scattering signals can be determined by measuring the echo time through the signal acquisition and control circuit, and the temperature distribution information of any point on the whole sensing optical fiber can be accurately and quickly obtained.
The sensing optical cable adopts a specially designed rapid heat-conducting optical cable, the fiber core adopts an imported GI 62.5/125 multimode optical fiber, the optical fiber protective layer adopts a high-strength polymer and stainless steel spiral tube armored sheath, and the outer sheath is a high-performance low-smoke halogen-free flame-retardant material, so that the sensing optical cable is high in tensile strength, good in bending resistance and pressure resistance, waterproof and corrosion-resistant, high in reliability and long in service life. Through the optical cable structure of special design, can transmit external heat fast, can effectively protect the inside optic fibre of optical cable again, can also prevent rodent's nibbling bite.
In this embodiment, in order to ensure the compactness of the system structure, since the data processing and transmitting device in the high-voltage cable sheath grounding loop on-line monitoring terminal is also required to be arranged close to the high-voltage cable, the humidity sensor may be installed inside the data processing and transmitting device, and the humidity sensor is connected with the microprocessor, so that the cable grounding loop data and the ambient humidity data are uniformly transmitted through the wireless communication device, and of course, the wireless humidity sensor may also be used to directly and independently transmit the humidity data wirelessly.
In some embodiments, the above-mentioned high-voltage cable sheath grounding circulation on-line monitoring system further includes a partial discharge detection device 6, the partial discharge detection device 6 is installed at a position close to the high-voltage cable, and the partial discharge detection device 6 is further connected in communication with the server 3.
Since the partial discharge phenomenon in a power cable is closely related to the insulation state of the cable, the occurrence of the partial discharge indicates that the insulation of the cable may have a defect that may endanger the safe operation of the cable. Whether the insulation defect exists or not and the severity of the defect can be judged by detecting the partial discharge level of the running cable, and maintenance is reasonably arranged according to the detection result, so that major accidents are avoided. The conditions for generating the partial discharge phenomenon will be described with reference to fig. 6:
1. the electric field acts, and air molecules in air gaps (bubbles) are dissociated;
2. positive and negative electrons are gathered to different polarities to gather charges;
3. the field intensity in the bubbles is increased, so that the bubbles are broken down;
4. the charge generation moves strongly to form a pulse current.
In fig. 6, (a) is the electric field distribution in the air gap, (b) is the reverse voltage generated by the discharge in the air gap, (c) is the voltage on the air gap, and (d) is the pulse signal of the air gap discharge.
Specifically, referring to fig. 7 and 8, the partial discharge detection apparatus specifically includes a high-frequency current sensor (i.e., a high-frequency current transformer), a phase sensor, and a high-frequency partial discharge live detection instrument, the high-frequency current sensor is sleeved outside a cable body to be detected (as shown in fig. 7) or a ground wire (as shown in fig. 8) connected to the cable, and the phase sensor is mounted on the cable body and mounted in a form of a clip.
In the embodiment, the phase sensor specifically uses a voltage phase information measurement sensor, and both the high-frequency current sensor and the phase sensor are electrically connected with the high-frequency partial discharge electrification detecting instrument. The detection instrument can be internally or externally connected with a wireless communication module to realize remote data transmission. The partial discharge detection device overcomes the defects of the traditional periodic detection, can monitor the running condition of the cable in real time, finds abnormality in advance, and reports data in time.
In some embodiments, in order to ensure the accuracy of the partial discharge detection, an infrared thermal imaging device may be further disposed above the cable to assist in detecting and locating the partial discharge position, and the specific detection principle may be referred to fig. 9. UHF in FIG. 9 represents an UHF partial discharge sensor for detecting 300-3000MHz discharge signals, mounted on a cable terminal with a ring-shaped shield clip; the infrared thermal imaging equipment is mainly used for detecting whether a cable generates heat or not, if the cable generates heat and damages insulation, cable terminal accessories are aged, and the cable terminal accessories are collected through the voltage phase information measuring sensor and mainly used for counting the periodic phase distribution of the discharge capacity.
To sum up, the utility model discloses a high tension cable sheath ground connection circulation on-line monitoring terminal and monitoring system compares with prior art, has following advantage:
1. the on-line measurement of the cable grounding circulation can be realized in real time by installing the open-close type current transformer and the data processing transmission equipment, and the wireless communication device is arranged in the data processing transmission equipment, so that the wireless data transmission can be realized, the problems of difficult wiring, large potential safety hazard and the like caused by a wired mode are avoided, and the whole monitoring terminal has a simple structure, is safe and reliable and is more suitable for large-scale popularization and application;
2. the system not only can realize the detection of the cable grounding circulation, but also can realize the real-time monitoring of the temperature and the humidity around the cable, the monitoring data is more various, and various monitoring data can be uploaded to the server and displayed for a user through user terminal equipment, the remote online monitoring of the high-voltage cable is realized, the system is efficient and reliable in work, and the requirements of people on the multi-parameter online monitoring of the cable can be more met.
3. The system is additionally provided with a partial discharge detection device, so that the partial discharge condition of the high-voltage cable can be monitored on line, and the working safety of the high-voltage cable is ensured to the maximum extent.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The utility model provides a high tension cable sheath ground connection circulation on-line monitoring terminal which characterized in that includes: the cable comprises an open-close type current transformer (11), data processing and transmitting equipment (12) and a power supply (13), wherein the open-close type current transformer (11) is sleeved on a cable grounding wire, the open-close type current transformer (11) is electrically connected with the data processing and transmitting equipment (12), and the power supply (13) supplies power to the data processing and transmitting equipment (12) and the open-close type current transformer (11);
the data processing and transmitting device (12) comprises a shell (121), and a circulation detection circuit (122), a microprocessor (123) and a wireless communication device (124) which are packaged in the shell (121), wherein the open-close type current transformer (11) is electrically connected with the circulation detection circuit (122), the circulation detection circuit (122) is electrically connected with the microprocessor (123), the microprocessor (123) is electrically connected with the wireless communication device (124), and the power supply (13) is electrically connected with the microprocessor (123).
2. The on-line terminal for monitoring the circulating current of the sheath of the high voltage cable according to claim 1, wherein the circulating current detecting circuit (122) comprises a current sensing coil (1221), a resistor (1222), and a voltage measuring module (1223), the current sensing coil (1221) is electrically connected to the open-close type current transformer (11), the current sensing coil (1221) is further connected in parallel to the resistor (1222), the parallel circuit of the current sensing coil (1221) and the resistor (1222) is electrically connected to the input terminal of the microprocessor (123), the voltage measuring module (1223) is electrically connected to both ends of the resistor (1222), and the voltage measuring module (1223) is further electrically connected to the microprocessor (123).
3. The on-line monitoring terminal for the circulating current of the high-voltage cable sheath grounding of claim 1, wherein a plurality of interfaces are formed on a side wall of the housing (121), the interfaces include a power interface, a current transformer interface, a communication interface and an optical fiber interface, the power supply (13) is electrically connected to the microprocessor (123) through the power interface, the plurality of open-close type current transformers (11) are electrically connected to the circulating current detection circuit (122) through the current transformer interfaces, the communication interface is used for data transmission with external equipment, and the optical fiber interface is used for connection with the external equipment through an optical fiber cable.
4. A high voltage cable sheath grounding circulation on-line monitoring system, characterized by comprising user terminal equipment (2), a server (3), a temperature sensor (4), a humidity sensor (5) and a high voltage cable sheath grounding circulation on-line monitoring terminal (1) according to any one of claims 1-3;
the temperature sensor (4) and the humidity sensor (5) are installed at positions close to the high-voltage cable, the high-voltage cable sheath grounding circulation on-line monitoring terminal (1), the temperature sensor (4) and the humidity sensor (5) are in communication connection with the server (3), and the server (3) is further in communication connection with the user terminal equipment (2).
5. The on-line monitoring system for the sheath grounding circulation of the high voltage cable as claimed in claim 4, further comprising a partial discharge detection device (6), wherein the partial discharge detection device (6) is installed at a position close to the high voltage cable, and the partial discharge detection device (6) is further connected to the server (3) in a communication manner.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847869A (en) * | 2021-09-07 | 2021-12-28 | 国网新疆电力有限公司电力科学研究院 | Low-voltage current transformer detection device and use method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847869A (en) * | 2021-09-07 | 2021-12-28 | 国网新疆电力有限公司电力科学研究院 | Low-voltage current transformer detection device and use method |
| CN113847869B (en) * | 2021-09-07 | 2024-03-22 | 国网新疆电力有限公司电力科学研究院 | Detection device for low-voltage current transformer and use method |
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