Harmonic monitoring device for power distribution network

Abstract

The utility model discloses a harmonic monitoring device for a power distribution network, which belongs to the technical field of power networks and comprises a clamping mechanism, a connecting plate and a current transformer, the clamping mechanism is used for fixedly clamping a telegraph pole, the current transformer is connected with a high-voltage line, and the current transformer is positioned above the connecting plate and is connected with the connecting plate through a vertical supporting spring rod. The side wall of the supporting spring rod is sleeved with a supporting ring used for supporting the supporting spring rod, and the inner wall of the supporting ring is connected with the side wall of the supporting spring rod through a plurality of springs evenly arranged in the circumferential direction. According to the utility model, through the arrangement of the clamping mechanism, the device can be conveniently fixed on a telegraph pole; according to the utility model, the supporting spring rod, the knuckle bearing and the spring are arranged, so that the current transformer can shake along with the high-voltage line when the high-voltage line shakes, and the current transformer is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the electric power network technical field, specifically related to a distribution network harmonic monitoring device. BACKGROUND

[0002] The power grid harmonic online monitoring device is a kind of equipment specially used for real-time monitoring and analyzing harmonic problems in power system. It can monitor harmonic voltage and harmonic current in power grid for a long time and in real time, record data, and provide voltage and current waveform and phasor diagram, so as to help power system operator to understand power quality condition of power grid, and provide data support for harmonic improvement measures. The following are main features and functions of power grid harmonic online monitoring device:

[0003] Monitoring content: the power grid harmonic online monitoring device can monitor current true effective value, fundamental wave effective value, 2-50 harmonic effective value; voltage true effective value, fundamental wave effective value, 2-50 harmonic voltage distortion rate, total distortion rate; true power factor, fundamental wave power factor; fundamental wave apparent power, fundamental wave active power, fundamental wave reactive power; voltage deviation; three-phase voltage unbalance degree; fundamental wave voltage (current) phase angle; power grid frequency; voltage fluctuation and flicker value (long-time flicker value (Plt), short-time flicker value (Pst)).

[0004] Control and communication: the device has receiving / transmitting control function, can send instructions to each monitoring point, extract data or set parameters, and receive power quality data, waveform and the like uploaded by each monitoring point.

[0005] Data processing: the device has data processing function, including graphic output and report output function, and can analyze and count monitoring data.

[0006] Safe and reliable: all voltage and current input channels adopt isolation measures, current adopts current clamp or built-in sensor, and voltage adopts photoelectric isolation module, to ensure safe and reliable operation of system and instrument.

[0007] Network mode: support RS232, RS485, TCP / IP and various communication modes, and can form power quality monitoring and management system (PQSMS).

[0008] Technical parameters: wide voltage measurement range, from 10V to 100V, can adapt to different power grid environments.

[0009] Application place: mainly used for power supply system of power plant, substation, wind farm, photovoltaic power station, petroleum, coal mine, steel, metallurgy, chemical industry and other large factories and mines of various voltage grades.

[0010] Main functions: including basic measurement quantities (such as power grid frequency, voltage, current effective value, total active power, reactive power, power factor, etc.), basic monitoring indicators (such as three-phase fundamental voltage, current effective value, fundamental power, power factor, phase, etc.), and advanced monitoring indicators (such as inter-harmonic, voltage fluctuation, flicker, voltage surge, sudden drop, short-term interruption, etc.).

[0011] The power grid harmonic online monitoring device can improve the reliability and stability of the power system, reduce the influence of the power system on other power consumption departments, ensure the power supply quality, and enable the power system to operate more economically, safely and stably

[0012] In the patent document with publication number CN219142956U, a power grid harmonic online monitoring device is provided, which includes a connecting plate fixed and clamped on a power pole by a back plate, and a current transformer fixedly connected to the upper end face of the connecting plate. The connecting plate can support the current transformer.

[0013] However, in the above-mentioned patent, the current transformer is directly arranged on the high-voltage line, and the high-voltage line will sway up and down and left and right under the influence of wind at high altitude. At this time, the high-voltage line will sway the current transformer, and since the current transformer is fixed on the connecting plate and cannot move, the high-voltage line will impact the current transformer when it sways, thereby easily damaging the current transformer. Utility model content

[0014] In order to solve the problem that the back-and-forth swaying of the high-voltage line damages the current transformer, the utility model provides a power distribution network harmonic monitoring device, which can make the current transformer sway with the high-voltage line and prevent the current transformer from being damaged.

[0015] The utility model discloses a kind of power distribution network harmonic monitoring devices, and the technical scheme used is as follows:

[0016] A power distribution network harmonic monitoring device includes a clamping mechanism for fixed clamping with a power pole, a connecting plate and a current transformer connected with a high-voltage line. The current transformer is located above the connecting plate, and the current transformer is connected with the connecting plate through a vertical support spring rod. A support ring for supporting itself is arranged on the side wall of the support spring rod, and the inner wall of the support ring is connected with the side wall of the support spring rod through a plurality of circumferentially uniformly arranged springs.

[0017] Further improvement of the technical scheme of the utility model is that the current transformer is connected with a signal conditioning module, the signal conditioning module is connected with a harmonic analysis module, the harmonic analysis module is connected with a wireless transmission module, and the wireless transmission module and the wireless receiving module are connected through a wireless network.

[0018] The further improvement of the technical scheme of the utility model lies in that: the bottom end of the sleeve of the supporting spring rod is connected with the connecting plate through the joint bearing, and the top end of the upper rod body of the supporting spring rod is connected with the current transformer through the joint bearing.

[0019] The further improvement of the technical scheme of the utility model above lies in that: one end of each spring away from the inner wall of the supporting ring is connected with the side wall of the sleeve of the supporting spring rod.

[0020] The further improvement of the technical scheme of the utility model above lies in that: the bottom of the supporting ring is connected with the connecting plate through the multiple vertical connecting rods.

[0021] The further improvement of the technical scheme of the utility model lies in that: the clamping mechanism comprises an arc-shaped plate which can be sleeved on the electric pole, and an arc-shaped adjusting plate which is located inside the arc-shaped plate and can move along the axial direction of the arc-shaped plate and the bending direction of which is the same as that of the arc-shaped plate.

[0022] The further improvement of the technical scheme of the utility model above lies in that: one side of the arc-shaped adjusting plate facing the inner wall of the arc-shaped plate is connected with the inner wall of the arc-shaped plate through the horizontal adjusting spring rod, and the one side of the arc-shaped adjusting plate facing the inner wall of the arc-shaped plate is hinged with the adjusting threaded rod through the bearing.

[0023] The further improvement of the technical scheme of the utility model above lies in that: one end of the adjusting threaded rod away from the arc-shaped adjusting plate is screwed through the arc-shaped plate and extends to the outside of the arc-shaped plate, and a adjusting handle is fixedly sleeved with the one end of the adjusting threaded rod outside the arc-shaped plate.

[0024] The further improvement of the technical scheme of the utility model above lies in that: it further comprises a protective cloth for protecting the supporting spring rod, the spring and the clamping mechanism.

[0025] Thanks to the above technical scheme, the technical progress achieved by the utility model includes:

[0026] The clamping mechanism arranged in the utility model can fix the utility model on the electric pole conveniently; the supporting spring rod, the joint bearing and the spring arranged in the utility model can make the current transformer sway along with the high-voltage line when the high-voltage line sways, so as to prevent the current transformer from being damaged; the supporting spring rod arranged in the utility model can make the current transformer sway up and down along with the high-voltage line, and the supporting spring rod can absorb the impact force generated by the swaying when the current transformer sways up and down along with the high-voltage line, so as to reduce the amplitude of the swaying of the high-voltage line to a certain extent; the spring arranged in the utility model can absorb the impact force generated by the swaying when the current transformer sways on the horizontal plane along with the high-voltage line, so as to reduce the amplitude of the swaying of the high-voltage line on the horizontal plane to a certain extent.

[0027] Meanwhile, the distance between the arc-shaped adjusting plate and the arc-shaped plate can be adjusted through the adjusting threaded rod, so that the utility model is conveniently fixed on the telegraph pole; the distance between the arc-shaped adjusting plate and the arc-shaped plate can be conveniently adjusted through the adjusting threaded rod, so that the utility model can be applied to telegraph poles with different diameters, and the versatility of the utility model is improved.

[0028] Meanwhile, the supporting spring rod, the spring, the adjusting spring rod and the adjusting threaded rod can be protected after the utility model is installed, so that the supporting spring rod, the spring, the adjusting spring rod and the adjusting threaded rod are prevented from being damaged by wind and rain. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the utility model when the power distribution network harmonic monitoring device is installed together with the telegraph pole;

[0030] Figure 2 is a structural schematic view of the utility model of the power distribution network harmonic monitoring device;

[0031] Figure 3 is a structural schematic view of the clamping mechanism of the utility model of the power distribution network harmonic monitoring device;

[0032] Figure 4 is a connection structural schematic view of the current transformer and the connecting plate of the utility model of the power distribution network harmonic monitoring device.

[0033] In the drawings: 1, telegraph pole;

[0034] 2, clamping mechanism; 21, arc-shaped plate; 22, arc-shaped adjusting plate; 23, adjusting spring rod; 24, adjusting threaded rod; 25, adjusting handle;

[0035] 3, connecting plate; 31, current transformer; 32, supporting spring rod; 33, supporting ring; 34, spring; 35, joint bearing; 36, connecting rod;

[0036] 4, protective cloth;

[0037] 5, high-voltage line. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the utility model is further described in detail below in combination with specific implementation manners and with reference to the drawings. In the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0039] Firstly refer to Figure 2The utility model discloses a clamping mechanism 2, the one side fixed connection of this clamping mechanism 2 has horizontal connecting plate 3, and the upper of connecting plate 3 is provided with the current transformer 31 of setting on high tension line 5.

[0040] The output end of the current transformer 31 is connected with a signal conditioning module, and after high-frequency interference in the signal is filtered through a low-pass filter, is sent into an A / D conversion module for analog-digital conversion; the A / D conversion module selects a high-performance analog-digital converter ADS8364, three-phase alternating current is synchronously sampled by using six channels of the ADS8364, and 16-bit digital quantity ensures sampling accuracy; a DSP digital signal processor reads A / D conversion results and carries out analysis, operation and processing of relevant harmonic parameters; the DSP digital signal processor adopts a TMS320F2812 chip, provides sufficient conditions for real-time control and completion of complex algorithms in a relatively short time, the DSP responds to the instruction control of an ARM control module, and the ADS8364 is controlled to complete A / D conversion, read conversion data, carry out fast Fourier transform (FFT) and relevant parameter calculation, process digital signals obtained after the front end A / D conversion, and use fast Fourier algorithm (FFT) to measure the partial harmonic current of three-phase current IA, IB and IC, the partial current harmonic content and the total current harmonic content; the wireless sensor network adopts an nRF2401 wireless transmission module.

[0041] The clamping mechanism 2 in the utility model can be referred to Figure 3 , according to Figure 3 It is known that the clamping mechanism 2 comprises an arc-shaped plate 21 for being sleeved on the telegraph pole 1, the arc-shaped plate 21 can be 1 / 2-3 / 4 of the length of a complete ring, meanwhile, the inner wall of the arc-shaped plate 21 is provided with an arc-shaped adjusting plate 22 movable along the axial direction of the arc-shaped plate 21, specifically, the two ends of the outer wall of the arc-shaped adjusting plate 22 are connected with the inner wall of the arc-shaped plate 21 through adjusting spring rods 23, and the outer wall of the arc-shaped adjusting plate 22 is hinged with a horizontal adjusting screw rod 24 through a bearing at the position between the two adjusting spring rods 23, one end of the adjusting screw rod 24 away from the arc-shaped adjusting plate 22 is screwed through the arc-shaped plate 21 and fixedly sleeved with an adjusting handle 25.

[0042] Meanwhile, in order to clamp more firmly on the telegraph pole 1, the inner walls of the arc-shaped plate 21 and the arc-shaped adjusting plate 22 can be fixedly connected with rubber friction pads (not shown in the figure), the rubber friction pads can enhance the friction force between the arc-shaped plate 21, the arc-shaped adjusting plate 22 and the telegraph pole 1, so that the utility model clamps more firmly on the telegraph pole 1.

[0043] The current transformer 31 and the connecting plate 3 in the utility model can be referred to Figure 4 , according to Figure 4It can be known that the vertical supporting spring rod 32 is arranged between the current transformer 31 and the connecting plate 3, specifically, the bottom end of the sleeve of the supporting spring rod 32 is connected with the connecting plate 3 through the joint bearing 35, and the top end of the upper rod body of the supporting spring rod 32 is connected with the current transformer 31 through the same joint bearing 35, and the supporting spring rod 32 is connected with the current transformer 31 through the same joint bearing 35. Figure 4 The connecting plate 3 is connected with the supporting ring 33 sleeved on the supporting spring rod 32 through the connecting rod 36, specifically, the supporting ring 33 is sleeved on the outside of the sleeve of the supporting spring rod 32, and the inner wall of the supporting ring 33 is uniformly arranged with a plurality of springs 34 connected with the outer wall of the sleeve of the supporting spring rod 32.

[0044] In the utility model, in order to prevent the supporting spring rod 32, the spring 34, the adjusting spring rod 23 and the adjusting threaded rod 24 from being damaged by wind and rain, the position of the supporting spring rod 32, the supporting ring 33, the spring 34, the adjusting spring rod 23 and the adjusting threaded rod 24 is provided with the protective cloth 4, and the protective cloth 4 can be made of the flexible rainproof cloth commonly used in the prior art. Figure 1

[0045] The working principle of the power distribution network harmonic monitoring device is that: first, the staff carries the utility model to the position on the telegraph pole 1 where the utility model needs to be installed, then the arc-shaped plate 21 of the utility model is sleeved on the outside of the telegraph pole 1, and the telegraph pole 1 is located between the arc-shaped plate 21 and the arc-shaped adjusting plate 22, then the adjusting handle 25 is rotated to adjust the position of the adjusting threaded rod 24, so that the position of the arc-shaped adjusting plate 22 is adjusted, until the inner wall of the arc-shaped plate 21 and the inner wall of the arc-shaped adjusting plate 22 are tightly attached to the telegraph pole 1, at this time, the utility model is firmly clamped on the telegraph pole 1, as shown in Figure 1 .

[0046] Then the current transformer 31 is sleeved on the high-voltage line 5, when the high-voltage line 5 drives the current transformer 31 to shake up and down, the supporting spring rod 32 will follow the current transformer 31 to stretch and contract, and the supporting spring rod 32 that stretches and contracts will absorb the impact force generated by the high-voltage line 5 shaking up and down, so that the amplitude of the high-voltage line 5 shaking up and down can be reduced to a certain extent; when the high-voltage line 5 drives the current transformer 31 to shake on the horizontal plane, the current transformer 31 will drive the current transformer 31 to swing and compress the spring 34 in the corresponding swing direction, when the spring 34 is compressed, it will absorb the impact force generated by the high-voltage line 5 driving the current transformer 31 to shake on the horizontal plane, so that the amplitude of the high-voltage line 5 shaking on the horizontal plane can be reduced to a certain extent.

[0047] ​In the above embodiment, the utility model provides a kind of distribution network harmonic monitoring device, the utility model is fixed on the electric pole by the clamping mechanism being set up, the utility model can be conveniently;The utility model in the present application is provided with supporting spring rod, joint bearing and spring, so that the current transformer can swing with the high-voltage line when the high-voltage line shakes, to prevent the current transformer from being damaged.

[0048] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the concept and scope of the present application. Without departing from the design concept of the present application, various modifications and improvements to the technical solution of the present application made by those skilled in the art shall fall within the scope of protection of the present application. The technical content claimed by the present application has been fully recorded in the claims.

Claims

1. A power distribution network harmonic monitoring device, comprising a clamping mechanism (2) for fixed clamping with a telegraph pole (1), a connecting plate (3) and a current transformer (31) connected with a high-voltage line (5), characterized in that: The current transformer (31) is located above the connecting plate (3), and the current transformer (31) is connected with the connecting plate (3) through a vertical supporting spring rod (32), and the side wall of the supporting spring rod (32) is sleeved with a supporting ring (33) for supporting itself, and the inner wall of the supporting ring (33) is connected with the side wall of the supporting spring rod (32) through a plurality of circumferentially uniformly arranged springs (34).

2. The power distribution network harmonic monitoring apparatus of claim 1, wherein: The current transformer (31) is connected with a signal conditioning module, the signal conditioning module is connected with a harmonic analysis module, the harmonic analysis module is connected with a wireless transmitting module, and the wireless transmitting module and the wireless receiving module are connected through a wireless network.

3. The power distribution network harmonic monitoring apparatus of claim 1, wherein: The bottom end of the sleeve of the supporting spring rod (32) is connected with the connecting plate (3) through a joint bearing (35), and the top end of the upper rod body of the supporting spring rod (32) is connected with the current transformer (31) through a joint bearing (35).

4. The power distribution network harmonic monitoring apparatus of claim 1, wherein: One end of each spring (34) away from the inner wall of the supporting ring (33) is connected with the side wall of the sleeve of the supporting spring rod (32).

5. The power distribution network harmonic monitoring apparatus of claim 1, wherein: The bottom of the supporting ring (33) is connected with the connecting plate (3) through a plurality of vertical connecting rods (36).

6. The power distribution network harmonic monitoring device according to any one of claims 1-5, characterized in that: The clamping mechanism (2) comprises an arc-shaped plate (21) which can be sleeved on the telegraph pole (1), and an arc-shaped adjusting plate (22) which is located inside the arc-shaped plate (21) and can move along the axial direction of the arc-shaped plate (21) and the bending direction of which is the same as that of the arc-shaped plate (21).

7. The power distribution network harmonic monitoring apparatus of claim 6, wherein: One side of the arc-shaped adjusting plate (22) facing the inner wall of the arc-shaped plate (21) is connected with the inner wall of the arc-shaped plate (21) through a horizontal adjusting spring rod (23), and the arc-shaped adjusting plate (22) is hinged with an adjusting threaded rod (24) through a bearing on the side facing the inner wall of the arc-shaped plate (21).

8. The power distribution network harmonic monitoring apparatus of claim 7, wherein: One end of the adjusting threaded rod (24) away from the arc-shaped adjusting plate (22) is threaded through the arc-shaped plate (21) and extends to the outside of the arc-shaped plate (21), and the end of the adjusting threaded rod (24) located outside the arc-shaped plate (21) is fixedly sleeved with an adjusting handle (25).

9. The power distribution network harmonic monitoring apparatus of claim 1, wherein: Further comprising a protective cloth (4) for protecting the supporting spring rod (32), the spring (34) and the clamping mechanism (2).

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