CN213903699U - Integrated cable partial discharge intelligent sensor based on transient electromagnetic signal detection - Google Patents

Abstract

An intelligent sensor based on transient electromagnetic signal detection integration cable partial discharge includes: the transient electromagnetic signal probe, the weak signal conditioning and amplifying module, the temperature measuring module, the microprocessor, the wireless communication module and the rolling belt fixing hole are sealed in the shell; the transient electromagnetic signal probe is electrically connected with the weak signal conditioning and amplifying module, the weak signal conditioning and amplifying module is electrically connected with the microprocessor, the temperature measuring module is electrically connected with the microprocessor, and the wireless communication module is electrically connected with the microprocessor. The energy management module comprises a power distribution circuit, the power distribution circuit is electrically connected with the microprocessor and the weak signal conditioning and amplifying module, and the power distribution circuit respectively supplies power to the microprocessor and the weak signal conditioning and amplifying module, so that energy conservation is realized.

Description

Integrated cable partial discharge intelligent sensor based on transient electromagnetic signal detection

Technical Field

The utility model relates to a power system fault detection technical field, concretely relates to integration cable partial discharge intelligent sensor based on transient state electromagnetic signal detects.

Background

Partial discharge monitoring and trend analysis thereof are the most effective means for detecting the development of cable insulation defects. At present, two detection methods are mainly used for detecting partial discharge of a cable in China: high frequency current methods and very high frequency methods.

The high-frequency current method uses a high-frequency current sensor HFCT to detect a pulse current signal generated by partial discharge, extracts a characteristic parameter of the partial discharge signal through post-processing of the signal, and performs statistical calculation. The frequency range of a measuring signal of a high-frequency current method is generally 100 kHz-30 MHz, and the method is mainly used for detecting cable accessories.

The principle of the Ultra High Frequency (UHF) method is that the frequency of an electromagnetic wave signal excited by partial discharge can reach GHz level, and the frequency of an interference signal in the environment where the electrical equipment is located is generally not higher than 20MHz, so that the radio frequency antenna can be used to detect the partial discharge of the equipment by receiving the electromagnetic wave signal in the ultra high frequency band (300 MHz-3 GHz).

The high-frequency current method requires a high-frequency current sensor to be installed on a ground wire of a cable, and various interference signals (switching of frequency conversion equipment, communication wireless signals and the like) on the ground wire in the system have a great influence on the detection sensitivity. Moreover, since a high-speed signal processing device is required, the power consumption of the device is high, and the cost is difficult to reduce, which is not suitable for large-area popularization and application. Meanwhile, the existing high-frequency current sensor and the signal processing and collecting unit are generally installed separately and connected by a coaxial cable, so that the difficulty in field installation and use is greatly increased.

When the inside of the cable is discharged, the ultrahigh frequency electromagnetic wave is seriously attenuated by the semi-conducting layer and the shielding layer, so that the detection sensitivity of the ultrahigh frequency method is reduced. And the receiving antenna and the signal collector of many equipment also set up separately, and the power consumption of signal collector is higher, and many cable operating environment almost can't obtain reliable power supply, leads to the field installation and the use of these equipment to be difficult.

SUMMERY OF THE UTILITY MODEL

The technique that exists is not enough to the aforesaid, the utility model aims at providing an integration cable partial discharge intelligent sensor based on transient state electromagnetic signal detects solves at present and can't carry out reliable on-line measuring to the cable partial discharge of operation in adverse circumstances.

In order to solve the technical problem, the utility model adopts the following technical scheme:

integrated cable partial discharge intelligent sensor based on transient electromagnetic signal detection includes: the transient electromagnetic signal probe, the weak signal conditioning and amplifying module, the temperature measuring module, the microprocessor, the wireless communication module and the rolling belt fixing hole are sealed in the shell; the transient electromagnetic signal probe is electrically connected with the weak signal conditioning and amplifying module, the weak signal conditioning and amplifying module is electrically connected with the microprocessor, the temperature measuring module is electrically connected with the microprocessor, and the wireless communication module is electrically connected with the microprocessor.

Preferably, the sensor further comprises an energy management module and a power supply, wherein the power supply adopts a disposable battery, and external supplementary energy is not used in the whole life cycle. The energy management module comprises a power distribution circuit, the power distribution circuit is electrically connected with the microprocessor and the weak signal conditioning and amplifying module, and the power distribution circuit of the energy management module supplies power energy to the microprocessor and the weak signal conditioning and amplifying module respectively, so that energy conservation is realized.

The transient electromagnetic signal probe, the weak signal conditioning and amplifying module, the temperature measuring module, the microprocessor, the wireless communication module and the power supply are integrally encapsulated in a shell.

The transient electromagnetic signal probe is coupled with a transient electromagnetic signal generated by partial discharge generated in the cable near the installation position of the transient electromagnetic signal probe; the weak signal conditioning and amplifying module is used for carrying out multistage amplification on the coupled transient electromagnetic signals, then the microprocessor is used for sampling and calculating the signals, and whether partial discharge exists or not and the intensity of the partial discharge are judged according to the waveform characteristics of the signals.

The microprocessor samples the signal of the temperature measurement module, calculates the temperature of the surface of the cable at the moment, circularly stores the temperature, sends the detected partial discharge signal and the detected cable temperature value to the wireless communication module, and sends the partial discharge signal and the detected cable temperature value to a superior monitoring system through the wireless communication module.

The transient electromagnetic signal probe and the temperature measuring module are positioned on the same plane, and the transient electromagnetic signal probe and the temperature measuring module are tightly attached to the surface of the tested cable.

The rolling belt fixing hole is used for positioning the rolling belt for fixing the sensor and the cable together, so that the mounting position of the sensor is prevented from moving.

The beneficial effects of the utility model reside in that: the device and the method for detecting the partial discharge of the integrated cable based on the transient electromagnetic signal detection judge the insulation hidden danger of the cable by utilizing the transient electromagnetic signal characteristics generated when the partial discharge occurs in the high-voltage cable, provide information and alarm for early detection of the cable fault hidden danger, and then timely process the cable fault hidden danger, thereby avoiding further expansion of accidents.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an integrated cable partial discharge intelligent sensor based on transient electromagnetic signal detection provided by the present invention;

fig. 2 is a control schematic diagram of the integrated cable partial discharge intelligent sensor based on transient electromagnetic signal detection provided by the utility model;

FIG. 3 is a circuit diagram of a weak signal conditioning amplifying module;

fig. 4 is a circuit diagram of an energy management circuit.

Description of reference numerals:

the device comprises a shell 1, an integrated transient electromagnetic signal probe 2, a weak signal conditioning and amplifying module 3, a temperature measuring module 4, a microprocessor 5, a wireless communication module 6, an energy management module 7 and a rolling strip fixing hole 8.

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.

As shown in fig. 1 to 3, the integrated cable partial discharge intelligent sensor based on electromagnetic transient signal detection includes a transient electromagnetic signal probe 2, a weak signal conditioning and amplifying module 3, a temperature measuring module 4, a microprocessor 5, a wireless communication module 6, an energy management module 7 and a power supply sealed in a housing 1, wherein the power supply may be a disposable battery; the transient electromagnetic signal probe 2 is electrically connected with the weak signal conditioning and amplifying module 3, the transient electromagnetic signal probe 2 is used for coupling transient electromagnetic signals generated by partial discharge generated in a cable near the installation position of the transient electromagnetic signal probe, the weak signal conditioning and amplifying module 3 is electrically connected with the microprocessor 5, the microprocessor 5 samples and calculates the signals after the weak signal conditioning and amplifying module 3 performs multi-stage amplification on the coupled transient electromagnetic signals, and whether the signals are partial discharge or not and the intensity of the partial discharge are judged according to the waveform characteristics of the signals; temperature measurement module 4 and microprocessor 5 electric connection, wireless communication module 6 and microprocessor 5 electric connection, microprocessor 5 samples temperature sensor 4's signal, calculates the temperature on cable surface this moment, carries out circulation storage to give wireless communication module 6 with the partial discharge signal that detects and cable temperature value, send superior monitoring system for by wireless communication module 6.

Furthermore, the energy management module 7 comprises a power distribution circuit and a power supply, the power supply can adopt a disposable battery, the power distribution circuit is electrically connected with the microprocessor 5 and the weak signal conditioning and amplifying module 3, and the power distribution circuit in the energy management module 7 supplies the battery energy to the microprocessor 5 and the weak signal conditioning and amplifying module 3 respectively, so that energy conservation is realized.

The utility model discloses the principle as follows: the transient electromagnetic signal probe 2 and the temperature measuring module 4 are positioned on the same plane, and the transient electromagnetic signal probe 2 and the temperature measuring module 4 are tightly attached to the surface of the tested cable during installation; the transient signal probe 2 is used for coupling a transient electromagnetic signal generated when partial discharge occurs in the cable near the installation position of the transient signal probe, the electrical signal is sent to the weak signal conditioning and amplifying module 3, the weak signal conditioning and amplifying module 3 performs multi-stage amplification on the signal, then the microprocessor 5 performs sampling and calculation processing on the signal, and whether the partial discharge occurs or not and the intensity of the partial discharge is judged according to the waveform characteristics of the signal. Meanwhile, the microprocessor 5 samples the signal of the temperature measuring module 4, calculates the temperature of the surface of the cable at the moment, circularly stores the temperature, sends the detected partial discharge signal and the detected cable temperature value to the wireless communication module 6, and sends the partial discharge signal and the detected cable temperature value to a superior monitoring system through the wireless communication module 6. The energy management module 7 distributes the energy of the battery to the weak signal conditioning and amplifying module 3 and the microprocessor 5 according to the detection process. All modules are integrated in the shell 1, and are encapsulated by insulating encapsulating materials, so that the IP68 protection grade is realized.

The rolled strip for fixing the sensor and the cable together is positioned through the rolled strip fixing hole 8, so that the mounting position of the sensor is prevented from moving.

The utility model discloses an equipment and method that little consumption cable partial discharge of integration detected based on transient state electromagnetic signal detects, whether there is dangerous insulation hidden danger in the cable is judged to the transient state electromagnetic signal characteristic that produces when utilizing the inside partial discharge that takes place of high tension cable, for early discovery cable fault hidden danger provides information and warning, and then in time handles, avoids the accident to further enlarge.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A smart sensor that detects integral cable partial discharge based on transient electromagnetic signals, comprising:

the transient electromagnetic signal probe, the weak signal conditioning and amplifying module, the temperature measuring module, the microprocessor and the wireless communication module are sealed in the shell;

the transient electromagnetic signal probe is electrically connected with the weak signal conditioning and amplifying module, the weak signal conditioning and amplifying module is electrically connected with the microprocessor, the temperature measuring module is electrically connected with the microprocessor, and the wireless communication module is electrically connected with the microprocessor.

2. The smart sensor of claim 1 wherein the sensor further comprises an energy management module and a power source.

3. The smart sensor of claim 2 wherein the power source is a disposable battery, with no external supplemental energy for the entire life cycle.

4. The smart sensor of claim 2,

the energy management module comprises a power distribution circuit which is electrically connected with the microprocessor and the weak signal conditioning and amplifying module,

and the power distribution circuit of the energy management module supplies power energy to the microprocessor and the weak signal conditioning and amplifying module respectively.

5. The intelligent sensor according to claim 1 or 2, wherein the transient electromagnetic signal probe, the weak signal conditioning and amplifying module, the temperature measuring module, the microprocessor, the wireless communication module and the power supply are integrally encapsulated in a shell.

6. The smart sensor of claim 1,

the transient electromagnetic signal probe is coupled with a transient electromagnetic signal generated by partial discharge generated in the cable near the installation position of the transient electromagnetic signal probe;

the weak signal conditioning and amplifying module is used for carrying out multistage amplification on the coupled transient electromagnetic signals, then the microprocessor is used for sampling and calculating the signals, and whether partial discharge exists or not and the intensity of the partial discharge are judged according to the waveform characteristics of the signals.

7. The intelligent sensor according to claim 1, wherein the microprocessor samples the signal of the temperature measurement module, calculates the temperature of the cable surface at that time, performs cyclic storage, and sends the detected partial discharge signal and the cable temperature value to the wireless communication module, which sends the partial discharge signal and the cable temperature value to a superior monitoring system.

8. The smart sensor of claim 1,

the transient electromagnetic signal probe and the temperature measuring module are positioned on the same plane, and the transient electromagnetic signal probe and the temperature measuring module are tightly attached to the surface of the tested cable.

9. The smart sensor of claim 1,

the rolling belt fixing hole is used for positioning the rolling belt for fixing the sensor and the cable together, so that the mounting position of the sensor is prevented from moving.

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