CN213689828U

CN213689828U - Wind-powered electricity generation field power cable fault point searching device

Info

Publication number: CN213689828U
Application number: CN202022355732.6U
Authority: CN
Inventors: 林磊
Original assignee: Xiangyang Branch Of China Resources New Energy Investment Co ltd
Current assignee: Xiangyang Branch Of China Resources New Energy Investment Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-07-13
Anticipated expiration: 2030-10-21

Abstract

The utility model discloses a device for searching fault points of power cables of a wind power plant, which comprises a mobile platform, wherein the lower surface of the mobile platform is hinged with supporting legs; the upper surface of the mobile platform is connected with a zero sequence current acquisition system; the zero-sequence current acquisition system comprises a zero-sequence CT (current transformer) which is connected to the upper surface of the mobile platform; the secondary end of the zero sequence CT is electrically connected with a controller inside the mobile platform; the primary end of the zero sequence CT is matched with a current collection cable in a cable well of the wind power plant; the device has solved wind-powered electricity generation field current collection circuit distribution distance longer, is difficult to confirm concrete fault point when taking place to puncture, and the problem that wastes time and energy when follow-up maintenance operation has portable, is convenient for remove and height-adjusting, can reduce the fault point investigation scope fast, and it is higher to seek fault point efficiency, labour saving and time saving's characteristics.

Description

Wind-powered electricity generation field power cable fault point searching device

Technical Field

The utility model belongs to the technical field of wind-powered electricity generation field cable fault detection, in particular to look for device to wind-powered electricity generation field power cable fault point.

Background

With the continuous increase of the single machine capacity of the wind turbine generator, more and more buried cables are adopted for the current collecting circuit of the wind power plant, one current collecting circuit adopting the buried cables generally has more than ten cable wells, and when one point of the cable is slightly punctured after running for years, the detected fault recording can acquire zero-sequence current; however, the collecting lines of the general wind power plant are buried for tens of kilometers, the distribution range is large, and therefore the specific position of a fault point is difficult to determine through fault recording.

Disclosure of Invention

The utility model aims to solve the technical problem that a device is looked for to wind-powered electricity generation field power cable fault point is provided, the device has solved wind-powered electricity generation field current collection circuit distribution distance longer, is difficult to confirm concrete fault point when taking place to puncture, and the problem that wastes time and energy when follow-up maintenance operation has portable, is convenient for remove and adjust the height, can reduce the fault point investigation scope fast, and it is higher to look for fault point efficiency, labour saving and time saving's characteristics.

In order to realize the above design, the utility model adopts the following technical scheme: a device for searching for a power cable fault point of a wind power plant comprises a mobile platform, wherein the lower surface of the mobile platform is hinged with supporting legs; the upper surface of the mobile platform is connected with a zero sequence current acquisition system; the zero-sequence current acquisition system comprises a zero-sequence CT (current transformer) which is connected to the upper surface of the mobile platform; the secondary end of the zero sequence CT is electrically connected with a controller inside the mobile platform; the primary end of the zero sequence CT is matched with a current collection cable in a cable well of the wind power plant.

Preferably, the number of the supporting legs is four; one end of the supporting leg is hinged with the lower surface of the mobile platform through an ear seat and a bolt; the other end of the supporting leg is connected with a universal wheel.

Preferably, the strip-shaped groove is formed in the lower surface of the mobile platform, and the supporting legs are matched with the groove in a clamping mode.

Preferably, the zero sequence current acquisition system further comprises four open-ended CTs, and the secondary ends of the open-ended CTs are electrically connected with a controller inside the mobile platform through CT binding posts on the upper surface of the mobile platform; the four openings CT are respectively used for connecting three-phase four wires of a current collecting circuit.

Preferably, the upper surface of the mobile platform is provided with a concave storage box; the upper surface of the storage box is hinged with a cover plate; the opening CT and the corresponding cable are placed in the storage box.

Preferably, a three-phase voltage transformer is arranged in the cable well and matched with the current collection cable; the secondary end of the three-phase voltage transformer adopts an open delta connection method.

Preferably, a PT terminal is arranged on one side of the CT terminal and connected with a three-phase voltage transformer; and the secondary end of the three-phase voltage transformer is electrically connected with the controller inside the mobile platform through a PT terminal.

Preferably, the upper surface of the mobile platform is provided with a display screen and an indicator light; the indicator lamps are two indicator lamps with different lamp colors, and respectively represent 'before fault point' and 'after fault point'; display screen and pilot lamp all with the inside controller output electric connection of moving platform.

Preferably, the input end of the controller is connected with two filters; the zero sequence CT, the open CT and the three-phase voltage transformer are electrically connected with the controller through a filter; the controller adopts an 80C51 singlechip.

The utility model has the advantages as follows:

1, zero sequence current measurement can be effectively carried out on a current collecting circuit at a cable well through zero sequence CT on the device, and the device is provided with a plurality of buckle type opening CT for the condition that a plurality of cables are dispersed; zero sequence voltage at the cable well can be measured through the opening triangular connection of the secondary end of the voltage transformer additionally arranged at the cable well; the acquired electric signals are processed by a filter, and then 50hz signals are sent to a controller for phase judgment, when the zero-sequence current lags by about 90 degrees of zero-sequence voltage, the detection point is positioned before a fault point, otherwise, the detection point is positioned behind the fault point, and dichotomy measurement is carried out, so that the line range of the fault point can be quickly determined, and time and labor are saved.

2, the device is provided with universal wheels and supporting legs capable of adjusting the height by rotating around a hinge point, so that the moving capability and portability of the device body are improved, and the cable can conveniently penetrate through the zero sequence CT to measure through moving and height adjusting; the opening CT is placed in the storage box, so that the storage box can be effectively protected and stored, and damage or loss in the conveying process is avoided.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic side view of the present invention.

Fig. 3 is a schematic connection diagram of the controller according to the present invention.

Fig. 4 is a schematic diagram of a cable well of the present invention.

The reference numbers in the figures are: moving platform 1, supporting leg 11, ear seat 111, universal wheel 112, cable shaft 12, current collection cable 13, zero sequence CT21, opening CT22, CT terminal 23, put thing box 24, apron 25, PT terminal 26, controller 3, wave filter 31, three-phase voltage transformer 4, display screen 5, pilot lamp 6.

Detailed Description

As shown in fig. 1-4, the device for searching the fault point of the power cable of the wind power plant comprises a mobile platform 1, wherein a supporting leg 11 is hinged to the lower surface of the mobile platform 1; the upper surface of the mobile platform 1 is connected with a zero sequence current acquisition system; the zero-sequence current acquisition system comprises a zero-sequence CT21, wherein a zero-sequence CT21 is connected to the upper surface of the mobile platform 1; the secondary end of the zero sequence CT21 is electrically connected with the controller 3 inside the mobile platform 1; the primary end of the zero sequence CT21 mates with the collector cable 13 in the cable well 12 of the wind farm.

Preferably, the number of the supporting legs 11 is four; one end of the supporting leg 11 is hinged with the lower surface of the mobile platform 1 through an ear seat 111 and a bolt; the other end of the supporting leg 11 is connected with a universal wheel 112.

Preferably, the strip-shaped groove has been seted up to moving platform 1 lower surface, supporting leg 11 and recess block cooperation.

Preferably, the zero sequence current acquisition system further includes four opening CTs 22, the secondary end of the opening CT22 is electrically connected to the controller 3 inside the mobile platform 1 through the CT terminal 23 on the upper surface of the mobile platform 1; the four openings CT22 are used to connect the three-phase four-wire of the collector line.

Preferably, the upper surface of the mobile platform 1 is provided with a concave storage box 24; the upper surface of the storage box 24 is hinged with a cover plate 25; the opening CT22 and corresponding cables are placed within the storage compartment 24.

Preferably, a three-phase voltage transformer 4 is arranged in the cable well 12 and matched with a current collection cable 13; the secondary end of the three-phase voltage transformer 4 adopts an open delta connection method.

Preferably, a PT terminal 26 is arranged on one side of the CT terminal 23 and is connected with the three-phase voltage transformer 4; the secondary end of the three-phase voltage transformer 4 is electrically connected with the controller 3 inside the mobile platform 1 through a PT binding post 26.

Preferably, the upper surface of the mobile platform 1 is provided with a display screen 5 and an indicator light 6; the indicator lamps 6 are two indicator lamps 6 with different lamp colors, and respectively represent 'before fault point' and 'after fault point'; display screen 5 and pilot lamp 6 all with the inside controller 3 output electric connection of moving platform 1.

Preferably, two filters 31 are connected to the input end of the controller 3; the zero sequence CT21, the opening CT22 and the three-phase voltage transformer 4 are electrically connected with the controller 3 through the filter 31; the controller 3 adopts an 80C51 singlechip.

The utility model provides a use method of device as follows:

by utilizing a bisection method, the device is moved into a cable well 12 close to the middle position of a current collection circuit of a wind power plant, and the cable penetrates through a zero sequence CT21 or an opening CT22 by adjusting the height of a supporting leg 11 and the position of a device body; connecting a secondary end of the voltage transformer with a PT wiring pile; the zero sequence current and the zero sequence voltage are processed by the filter 31, and then the phase lag condition is judged by the controller 3, so that whether the detection point is positioned in front of or behind the fault point is judged, and the corresponding indicator lamp 6 is lightened; then, continuing to perform subsequent searching by using a bisection method until the fault point is reduced to be between the two cable wells 12, and determining the specific fault position through professional buried cable detection equipment; the display screen 5 displays the conditions of zero sequence current, zero sequence voltage and the like.

The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.

Claims

1. The utility model provides a wind-powered electricity generation field power cable fault point looks for device which characterized in that: comprises a mobile platform (1), wherein the lower surface of the mobile platform (1) is hinged with a plurality of supporting legs (11); the upper surface of the mobile platform (1) is connected with a zero sequence current acquisition system; the zero sequence current acquisition system comprises a zero sequence CT (21), wherein the zero sequence CT (21) is connected to the upper surface of the mobile platform (1); the secondary end of the zero sequence CT (21) is electrically connected with a controller (3) in the mobile platform (1); the primary end of the zero sequence CT (21) is matched with a current collection cable (13) in a cable well (12) of the wind power plant.

2. The wind farm power cable fault point finding device according to claim 1, characterized in that: one end of the supporting leg (11) is hinged with the lower surface of the mobile platform (1) through an ear seat (111) and a bolt; the other end of the supporting leg (11) is connected with a universal wheel (112).

3. The wind farm power cable fault point finding device according to claim 1, characterized in that: the lower surface of the mobile platform (1) is provided with a strip-shaped groove, and the supporting legs (11) are matched with the groove in a clamping manner.

4. The wind farm power cable fault point finding device according to claim 1, characterized in that: the zero sequence current acquisition system further comprises a plurality of opening CT (22), and the secondary ends of the opening CT (22) are electrically connected with the controller (3) inside the mobile platform (1) through a CT wiring terminal (23) on the upper surface of the mobile platform (1).

5. The wind farm power cable fault point finding device according to claim 1, characterized in that: a concave storage box (24) is arranged on the upper surface of the mobile platform (1); the upper surface of the storage box (24) is hinged with a cover plate (25); the opening CT (22) and corresponding cables are placed within the storage compartment (24).

6. The wind farm power cable fault point finding device according to claim 1, characterized in that: a three-phase voltage transformer (4) is arranged in the cable well (12) and matched with a current collection cable (13); the secondary end of the three-phase voltage transformer (4) adopts an open delta connection method.

7. The wind farm power cable fault point finding device according to claim 4, characterized in that: a PT terminal (26) is arranged on one side of the CT terminal (23) and is connected with a three-phase voltage transformer (4); the secondary end of the three-phase voltage transformer (4) is electrically connected with the controller (3) inside the mobile platform (1) through a PT binding post (26).

8. The wind farm power cable fault point finding device according to claim 1, characterized in that: a display screen (5) and an indicator lamp (6) are arranged on the upper surface of the mobile platform (1); the indicator lamps (6) are two indicator lamps (6) with different lamp colors; display screen (5) and pilot lamp (6) all with inside controller (3) output electric connection of moving platform (1).

9. The wind farm power cable fault point finding device according to claim 1, characterized in that: the input end of the controller (3) is connected with two filters (31); the zero sequence CT (21), the opening CT (22) and the three-phase voltage transformer (4) are electrically connected with the controller (3) through the filter (31).