CN214895532U - Lightning trip-out monitoring device - Google Patents

Abstract

The utility model discloses a thunderbolt tripping monitoring device sets up in the transformer substation place, thunderbolt tripping monitoring device includes electric field measurement sensor, and electric field measurement sensor installs the top in an insulating pole setting, insulating pole setting phase-splitting perpendicular to high altitude high tension power line, fixed erects subaerial, and electric field measurement sensor on insulating pole setting top is located the position of induction electric field intensity for being close zero potential under the high tension power line charged state, and electric field measurement sensor's signal passes through the thunderbolt tripping monitoring circuit that the cable conductor introduced and set up on ground, high tension switch monitoring system's switch monitoring signal connects thunderbolt tripping monitoring circuit. The utility model discloses a non-contact mode gathers thunderbolt transient state voltage signal, only needs to set up collection system at transmission line both ends transformer substation, and the installation is maintained and is need not to have a power failure, has realized tripping operation constantly synchronous acquisition and has collected thunderbolt transient state voltage signal, and the analysis and judgment for thunderbolt tripping operation type provides accurate information.

Description

Lightning trip-out monitoring device

Technical Field

The utility model belongs to the technical field of the thunder and lightning intelligence protection, concretely relates to thunderbolt tripping monitoring device.

Background

The power industry is an important component of national economy, and the transmission line is the main artery of the power industry and is an important component of a power system. The transmission line, especially the ultra-high voltage transmission line and the ultra-high voltage transmission line, has large length, wide coverage area and complex natural and geographical conditions, is easily influenced by various natural disasters, and the operation reliability of the transmission line plays a crucial role in the safe and stable operation of the whole power system.

Lightning damage is one of the most common natural disasters faced by power transmission lines, and lightning strike has become one of the most important factors causing power transmission line faults, tripping and influencing safe operation of power grids. With the development of ultra-high voltage and extra-high voltage, the lightning protection problem of the transmission line is more prominent.

Lightning trip has become the main cause of trip of transmission lines with voltage class above 220 kV. Although the existing lightning positioning system and the distributed fault monitoring system of the power transmission line are widely applied, whether line tripping is caused by lightning flashover or not can be accurately judged, and the positioning range of a lightning flashover tower is reduced to 1-2 bases, the type of the lightning tripping fault cannot be accurately judged. The existing method for accurately judging the lightning trip-out type still comprises the steps of firstly climbing a tower to search a discharge channel, calculating the lightning resistance level of a flashover tower and calculating the shielding failure trip-out rate, and has the advantages of low intelligent level and large workload. Therefore, the type of the lightning stroke fault needs to be identified by analyzing the monitored transient voltage signal data, so that the fault processing efficiency is improved, and the lightning protection measures of the power transmission line are guided. The method is particularly critical for accurately judging the lightning trip type to acquire accurate lightning trip information, however, the existing lightning positioning system and the distributed fault monitoring system of the power transmission line are generally provided with a mutual inductor directly along the high-voltage power transmission line to acquire a lightning stroke signal, and obviously, the facility cannot provide accurate information for judging the lightning trip type.

Disclosure of Invention

An object of the utility model is to provide a thunderbolt tripping operation monitoring devices and method adopts non-contact wide band transient state voltage monitoring sensor to gather thunderbolt transient state voltage signal, provides accurate information for the analysis and judgment of thunderbolt tripping operation type.

In order to realize the purpose, the technical scheme of the utility model is that:

the utility model provides a thunderbolt tripping monitoring device, sets up in the transformer substation place, and there is A, B, C three-phase high tension power line on the transformer substation place ground, and three-phase high tension power line passes through knife switch respectively and introduces the interior facility of transformer substation, has high tension switch monitoring system in the transformer substation, thunderbolt tripping monitoring device includes electric field measurement sensor, and electric field measurement sensor installs the top at an insulating pole setting, wherein, insulating pole setting phase-splitting perpendicular to high altitude high tension power line, fixed erects subaerial, and the electric field measurement sensor on insulating pole setting top is located the position that the induced electric field intensity is near zero potential under the high tension power line charged state, and electric field measurement sensor's signal passes through the thunderbolt tripping monitoring circuit that the cable conductor introduced and set up on ground, high tension switch monitoring system's switch monitoring signal connection thunderbolt tripping monitoring circuit.

The scheme is further as follows: the near zero potential location is a location that enables the electric field measurement sensor to sense a lightning strike signal.

The scheme is further as follows: the insulating vertical rod is an insulating vertical rod which is formed by sleeving a base pipe and a telescopic pipe and can be adjusted in height in a telescopic mode.

The scheme is further as follows: and a lightning arrester is arranged between the high-voltage transmission line beside the insulating vertical rod and the ground.

The scheme is further as follows: the horizontal distance between the lightning arrester and the insulating vertical rod is not more than 2.5 meters.

The scheme is further as follows: the electric field measuring sensor is a photoelectric integrated sensor, and signals of the photoelectric integrated sensor are introduced into a lightning trip monitoring circuit arranged on the ground through an optical fiber cable.

Compared with the prior art, the beneficial effects of the utility model are that: the device adopts the non-contact mode to gather thunderbolt transient state voltage signal, only needs to set up collection system at transmission line both ends transformer substation, and the installation is maintained and need not to have a power failure, has realized tripping operation moment and has acquireed thunderbolt transient state voltage signal in step, and the analysis of tripping operation type provides accurate information for the thunderbolt.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of the measuring device of the present invention;

FIG. 2 is a schematic diagram of a measurement circuit of the present invention;

figure 3 is a schematic diagram of the electric field transient waveform intercepted by the measurement circuit for a time period prior to the trip time.

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.

In the description of the present embodiment, it should be noted that the terms "connected" and "disposed" should be interpreted broadly, for example, the "connection" may be a wire connection or a mechanical connection; the 'placing' can be fixedly connected placing or integrally formed placing. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.

A lightning trip-out monitoring device is arranged in a transformer substation field, as shown in figures 1 and 2, A, B, C three-phase high-voltage power transmission lines 1 are arranged in the ground of the transformer substation field, the three-phase high-voltage power transmission lines are respectively led into facilities in the transformer substation through a knife switch 2, a high-voltage switch monitoring system 3 is arranged in the transformer substation, the high-voltage switch monitoring system 3 monitors the on-off state of a high-voltage switch, the lightning trip-out monitoring device comprises an electric field measuring sensor 4 which is arranged at the top end of an insulating upright rod 5, the insulating upright rod is an insulating upright rod with a telescopic height which is formed by sleeving a base pipe 501 and a telescopic pipe 502, wherein the insulating upright rod is split-phase perpendicular to the high-altitude high-voltage power transmission lines and fixedly erected on the ground, the base pipe 501 is fixed on a ground cement base 6, the electric field measuring sensor at the top end of the insulating upright rod is positioned at a position where the induction electric field intensity is close to zero potential under the charged state of the high-voltage power transmission lines, as shown in fig. 2, signals of A, B, C three-phase electric field measuring sensors corresponding to A, B, C three-phase high-voltage transmission lines are introduced into a lightning trip monitoring circuit 7 arranged on the ground through cables, and switch monitoring signals of the high-voltage switch monitoring system are connected with the lightning trip monitoring circuit. The lightning trip monitoring circuit 7 can be directly arranged in a field or in a monitoring room, a signal of the electric field measuring sensor is switched to the lightning trip monitoring circuit in the monitoring room through a cable and a signal terminal box, and the monitoring circuit comprises a central processing unit and a memory.

Wherein: the near zero potential location is a location that enables the electric field measurement sensor to sense a lightning strike signal, for example: the electric field strength is in a position between 0 and 100V to improve the sensitivity of the sensor measurement, 100V corresponding to a lightning strike voltage of tens of thousands of volts can be considered as a near zero potential.

For safety reasons, a lightning arrester 8 is arranged between the high-voltage transmission line beside the insulating vertical rod and the ground. Wherein: the horizontal distance between the lightning arrester and the insulating vertical rod is not more than 2.5 meters.

In this embodiment, the electric field measurement sensor is an electrode-free photoelectric integrated sensor, so that a signal of the photoelectric integrated sensor can be introduced into the lightning trip monitoring circuit arranged on the ground through an optical fiber cable, the electrode-free photoelectric integrated sensor has the characteristic of high sensitivity, and the transmission interference resistance through the optical fiber cable is good.

The following is a monitoring method based on the lightning trip monitoring device:

firstly, under the conditions of no lightning stroke and charged high-voltage transmission line, adjusting the position of an electric field measuring sensor through an insulating vertical rod with the height capable of being adjusted in a telescopic mode to enable the measured electric field intensity to be between 0 and 100V, wherein when a lightning stroke phenomenon occurs and an electric field transient change signal is detected from the electric field measuring sensor, the detected electric field transient change waveform information is continuously stored and contains synchronous time information; when lightning trip occurs, according to the fact that the trip time sent by a transformer substation high-voltage switch monitoring system is received, electric field transient variation waveform information of a time period before the trip time is intercepted, and the intercepted electric field transient variation waveform information is sent to a lightning trip classification module to carry out type analysis and output a lightning trip type. Fig. 3 illustrates the electric field transient variation waveform information of a time period before the tripping moment is intercepted.

Wherein: the lightning trip classification module comprises a lightning trip type judging convolutional neural network model, characteristic information extraction is carried out on intercepted electric field transient variation waveform information, the extracted characteristic information is sent to the lightning trip type judging convolutional neural network model, and a lightning trip type is output. Judging a convolutional neural network model is a known technology which is currently used for identifying images, extracting the characteristics of the images, and then inputting the characteristics of the images into a model for identification, such as face identification; the method utilizes the technology to extract the image characteristics of the voltage signal characteristic image of the transient variation waveform time period of the electric field before the lightning trip, and then judges the trip type by judging the convolutional neural network model.

Wherein the time period is a time period in which the electric field transient variation waveform information contains a plurality of electric field intensity absolute values higher than a predetermined peak value, and the predetermined peak value and the number are determined according to the electric field transient variation waveform information of a known lightning trip type. The predetermined peak is typically chosen to be 10kv, and it can be seen from fig. 3 that the length of the time period is typically around 1.5 milliseconds.

Claims (6)

1. A lightning trip-out monitoring device is arranged in a substation site, A, B, C three-phase high-voltage transmission lines are arranged in the ground of the substation site, the three-phase high-voltage transmission lines are respectively led into facilities in the substation through knife switches, a high-voltage switch monitoring system is arranged in the substation, the lightning trip-out monitoring device comprises an electric field measuring sensor which is arranged at the top end of an insulating vertical rod, the lightning trip monitoring system is characterized in that the insulation vertical rod split phase is perpendicular to a high-altitude high-voltage power transmission line and is fixedly erected on the ground, an electric field measuring sensor at the top end of the insulation vertical rod is located at a position where the induced electric field intensity is close to zero potential in a charged state of the high-voltage power transmission line, a signal of the electric field measuring sensor is introduced into a lightning trip monitoring circuit arranged on the ground through a cable, and a switch monitoring signal of the high-voltage switch monitoring system is connected with the lightning trip monitoring circuit.

2. The lightning trip monitoring device of claim 1 wherein the near zero potential location is a location that enables an electric field measuring sensor to sense a lightning strike signal.

3. The lightning trip monitoring device of claim 1, wherein the insulating upright is a telescopically adjustable height insulating upright comprised of a base tube and a telescoping tube.

4. The lightning trip monitoring device of claim 1 wherein a lightning arrester is disposed between the high voltage power line adjacent the insulated pole and ground.

5. The lightning trip monitoring device of claim 4 wherein the lightning arrester is horizontally spaced from the insulating pole by no more than 2.5 meters.

6. The lightning trip monitoring device of claim 1, wherein the electric field measurement sensor is a photoelectric integrated sensor, and a signal of the photoelectric integrated sensor is introduced into a lightning trip monitoring circuit arranged on the ground through a fiber optic cable.

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