CN105253721A - Wiring device for grounding grid characteristic parameter testing - Google Patents

Abstract

The invention belongs to the technical field of electrical devices, in particular to a wiring device for testing characteristic parameters of a grounding network. The invention includes a pay-off vehicle, a winding device and a counting device, wherein the winding device and the counting device are connected to the pay-off vehicle. In the present invention, the winding reel is placed on the pay-off car, and the pay-off car can be pushed to complete the test wiring, which reduces the workload of the traditional way of laying out the wire by manpower. In addition, the pay-off car can replace the new winding reel by opening the sub-frame, so that it does not need to push the test line with too much weight at one time, which greatly reduces the work intensity. At the same time, the present invention can overcome the previous method of estimating the length by the number of steps, greatly improve the accuracy of the test data, and reduce the work intensity of the previous manual winding method to the greatest extent.

Description

Grounding network characteristic parameter test wiring device

technical field

The invention belongs to the technical field of electrical devices, in particular to a wiring device for testing characteristic parameters of a grounding grid.

Background technique

The grounding electrode is a metal conductor buried in the ground and directly in contact with the earth. The grounding grid is composed of vertical and horizontal grounding electrodes. It is used in power plants and substations and has both discharge and pressure equalization functions. It is in a horizontal mesh structure. The condition of the grounding grid is directly related to the safe operation of the power system. It is very important to scientifically and reasonably test various characteristic parameters of the grounding grid and accurately evaluate its condition.

According to the requirements of DL/T475-2006 "Guidelines for the Measurement of Characteristic Parameters of Grounding Devices", the handover test of large-scale grounding grids should carry out tests of various characteristic parameters; during the operation process, retests should be carried out periodically or when necessary. The current testing method mainly has the following two problems:

(1) According to the standard requirements, the current electrode for testing the power frequency characteristic parameters of the grounding grid should be arranged as far as possible, which should be 4-5 times the maximum diagonal length D of the grounding grid under test. For substations of general scale, the test line should also be Need to place 2-3 km. At present, each unit in the system generally uses a bundle of 100m-long wire reels (commonly known as "wire reels") to arrange the test lines in series. After the test is completed, it is necessary to use the crank handle to manually take up the wires, and the workload of paying off and taking up the wires Large, taking a 220 kV substation as an example, a test generally takes 4-5 people and takes 2 days to complete.

(2) According to the standard requirements, a potential electrode should be selected every 50m for the grounding grid impedance test. The above method can only roughly select the potential electrode, which will have a certain impact on the test results.

Contents of the invention

The purpose of the present invention is to solve the technical problems in the above-mentioned existing testing methods, and propose a grounding grid characteristic parameter test wiring device, specifically a wiring device installed on a trolley. In the process, the working intensity of the test personnel is improved, the test efficiency is improved, and the length of the test line can be accurately measured to improve the test accuracy.

The technical scheme that the present invention takes for realizing the above-mentioned purpose of the invention is:

The wiring device for testing the characteristic parameters of the grounding grid includes a pay-off vehicle, a winding device and a counting device, wherein the winding device and the counting device are connected to the pay-off vehicle.

The pay-off car is composed of two parts, the main frame and the sub-frame. The sub-frame is connected to the main frame through a rotating shaft and can rotate freely along the rotating shaft; One side is fixed on the main frame, and the other side of the winding reel bracket is connected with the sub-frame; the sub-frame is locked and connected with the main frame, the main frame is also equipped with a handle, and the bottom of the main frame is equipped with wheels ; The main frame is also provided with a guide pulley A and a guide pulley B, and the test line is introduced to the bottom of the pay-off car through two guide pulleys; the sub-frame is connected with the main frame through a rotating shaft and can rotate freely along the rotating shaft.

The bottom of the main frame is provided with wheels, which are respectively wheel A, wheel B, wheel C, and wheel D; the wheel C and wheel D can rotate freely in the circumferential direction to control the forward direction of the pay-off car, and the rear wheel A and wheel B is a non-circumferential rotating structure.

The winding device includes a winding reel, a DC motor, a transmission belt, a storage battery and a control unit; the winding reel is erected on the pay-off vehicle through a winding reel support, and can freely rotate around the winding reel support; the winding The disc bracket clamps the sub-frame and the main frame through the outer buckle nut, and axially positions the winding disc; one side of the winding disc is provided with a transmission gear, which is connected to the DC motor through the transmission belt on the transmission gear The battery, the DC motor and the control unit are arranged in the main frame, and the control unit is connected in series in the loop formed by the battery and the DC motor.

The counting device includes a sensor, a counter and a data line. The sensor and the counter are fixed on the main frame and connected through the data line. The data line connects the sensor and the counter and displays the current wiring distance in real time on the counter display screen; test The wire is wound on the winding reel, and one end is pulled out and passed around the sensor, and is introduced to the bottom of the pay-off car by guide pulley A and guide pulley B.

The wiring method of testing the wiring device by using the characteristic parameters of the grounding grid includes the following steps:

Wire installation stage: the tester rotates the outer buckle nut and takes it out from the sub-frame, opens the sub-frame with the rotating shaft as the axis, fixes the winding reel on the main frame through the winding reel bracket, and puts the sub-frame Take the rotating shaft as the axis to close, and rotate the outer buckle nut into the winding reel bracket to lock the sub-frame and the main frame;

Pull out one end of the test line and pass it along the sensor, guide pulley A, and guide pulley B, and drive the tap into the ground through the iron braze;

Wire-laying stage: The tester pushes the wiring device to move through the handle, so that the test line passes through the bottom of the wiring device. The test line will drive the sensor to rotate synchronously. Send it back to the counter, and the counter will display the current pay-off distance on the counter screen in real time after calculation;

Wire take-up stage: connect the control circuit of the DC motor and the battery by operating the control unit, at this time the DC motor starts to rotate, and the rotation of the DC motor drives the winding reel to rotate synchronously through the transmission belt, and the test line is driven by the winding reel to rotate in reverse to the winding reel; after the winding is completed, the control loop is disconnected by operating the control unit, so that the winding reel stops rotating, and the winding is completed.

The advantages and positive effects that the present invention has are:

In the present invention, the winding reel is placed on the pay-off car, and the pay-off car can be pushed to complete the test wiring, which reduces the workload of the traditional way of paying off the wire by manpower; in addition, the release The wire car is composed of two parts, the main frame and the sub-frame, and the new winding reel can be replaced by opening the sub-frame, so that it is not necessary to push a heavy test line at one time, which greatly reduces the work intensity.

The sensor rotates synchronously under the drive of the test line, and the length of the test line can be accurately measured and calculated after being connected to the counter through the data line, which overcomes the previous method of estimating the length by the number of steps and greatly improves the accuracy of the test data.

The winding reel can rotate synchronously under the drive of the DC motor through the transmission belt, so as to realize the function of electric winding after the test, and reduce the work intensity of the previous manual winding to the greatest extent.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a structural side view of the present invention;

Fig. 2 is a structural top view of the present invention;

Fig. 3 is a front view of the external buckle nut.

In the figure: main frame 1, handle 2, winding reel 3, DC motor 4, battery 5, wheel A6, sensor 7, counter 8, data line 9, guide pulley A10, guide pulley B20, transmission belt 11, test line 12 , Shaft 13, reel support 14, outer buckle nut 15, subframe 16, wheel B17, wheel C18, wheel D19, control unit 21.

detailed description

In order to further understand the content, features and effects of the present invention, the following examples are given, and detailed descriptions are given below with reference to the accompanying drawings. The present invention is a grounding network characteristic parameter test wiring device, as shown in Fig. 1-Fig. 3, comprising: a pay-off car, a winding device and a counting device.

The pay-off car is composed of two parts, the main frame 1 and the sub-frame 16. The sub-frame 16 is connected with the main frame 1 through the rotating shaft 13 and can rotate freely along the rotating shaft. The main frame 1 is provided with a winding reel support 14, one side of the winding reel support 14 is fixedly welded to the main frame 1, and the other side is provided with an inner buckle thread, which is connected to the subframe 16 through an outer buckle nut 15 . The auxiliary frame 16 is locked with the main frame 1 through the outer buckle nut 15, and the main frame 1 is also provided with a secondary handle 2, and the bottom of the main frame 1 is also provided with wheels, which are convenient for testers to carry out wiring and pass through the handle. Control the forward or backward direction of the pay-off car. The four wheels are respectively wheel A6, wheel B17, wheel C18, and wheel D19. The wheel C18 and wheel D19 can rotate freely in the circumferential direction to control the forward direction of the pay-off car. The rear wheel A6 and wheel B17 are non-circumferentially rotatable structures. Its rotation direction is the same level as that of the pay-off car.

A secondary guide pulley A10 and a guide pulley B20 are also provided in the main frame 1, and the test line 12 is introduced to the bottom of the pay-off car through the two guide pulleys; the auxiliary frame 16 is connected with the main frame 1 through the rotating shaft 12 and can be moved The rotating shaft 12 rotates freely to facilitate the replacement of the winding reel 3 .

The winding device is composed of a winding reel 3 , a DC motor 4 , a transmission belt 11 , a storage battery 5 and a control unit 21 . The reel 3 is erected on the pay-off car by the reel support 14, and can rotate freely around the reel support 14; the reel support 14 connects the subframe 16 with the main frame 1 is clamped to achieve axial positioning of the winding disc 3. One side of the winding reel 3 is provided with a transmission gear, which is connected to the DC motor 4 through the transmission belt 11 on the transmission gear; A control unit 21 is connected in series in the formed circuit, and the control unit 21 can control the start and stop of the DC motor 4 to realize the function of automatic wire take-up.

Described counting device is made up of sensor 7, counter 8 and data wire 9, and sensor 7 and counter 8 are fixed on the main vehicle frame 1, and link to each other by data wire 9, and data wire 9 connects sensor 7 and counter 8 and connects in The current wiring distance is displayed on the display screen of the counter in real time; the test line 12 is wound on the winding reel 3, and one end is pulled out and bypassed from the sensor 7, and is introduced to the bottom of the pay-off car by the guide pulley A10 and the guide pulley B20; Driven by the test line 12, the sensor 7 will rotate synchronously and send the number of rotations back to the technical device through the data line, so as to achieve the function of testing the wiring distance.

When the present invention is concretely implemented, comprise the following operation steps:

Wire installation stage: the tester rotates the outer buckle nut 15 and takes it out from the sub-frame 16, opens the sub-frame 16 with the rotating shaft 13 as the axis, and fixes the winding reel 3 to the main frame through the reel support 14 1, the sub-frame 16 is closed with the rotating shaft 13 as the axis, and the outer buckle nut 15 is rotated into the reel support 14, and the sub-frame 16 and the main frame 1 are locked.

Pull out one end of the test line 12 and pass it along the sensor 7, the guide pulley A10, and the guide pulley B20, and drive the tap into the ground through an iron braze.

Wire-laying stage: the tester pushes the wiring device to move through the handle 2, so that the test line 12 passes through the bottom of the wiring device, and the test line 12 will drive the sensor 7 to rotate synchronously. The data line 9 sends the number of laps back to the counter 8, and the counter 9 will display the current pay-off distance on the screen of the counter 8 in real time after calculation.

Take-up stage: connect the control circuit between the DC motor 4 and the storage battery 5 by operating the control unit 21. At this time, the DC motor 4 starts to rotate, and the rotation of the DC motor 4 drives the winding reel 3 to rotate synchronously through the transmission belt 11. The test line 12 is winding Driven by the wire reel 3, it is reversely wound onto the wire reel 3. After the wire winding is completed, the control loop is disconnected by operating the control unit 21, so that the winding reel 3 stops rotating, and the wire winding is completed.

Claims (6)

1. grounding lattice characteristic parameter test wire device, is characterized in that: comprise wheeled cable drum carriage, Winder and counting assembly, wherein wheeled cable drum carriage is connected with Winder and counting assembly.

2. grounding lattice characteristic parameter test wire device according to claim 1, it is characterized in that: described wheeled cable drum carriage is made up of main car frame (1) and subframe (16) two parts, subframe (16) to be connected with main car frame (1) by rotating shaft (13) and freely can to rotate along rotating shaft; Main car frame (1) is provided with wire spool support (14), wire spool support (14) side is fixed on main car frame (1), and the opposite side of wire spool support (14) is connected with subframe (16); Subframe (16) is locked with main car frame (1) and is connected, and main car frame (1) is also provided with handle (2), and main car frame (1) bottom is provided with wheel; Also be provided with leading sheave A (10) and leading sheave B (20) in main car frame (1), by two leading sheaves, testing wire (12) be incorporated into bottom wheeled cable drum carriage; Subframe (16) to be connected with main car frame (1) by rotating shaft (12) and freely can to rotate along rotating shaft (12).

3. grounding lattice characteristic parameter test wire device according to claim 1, it is characterized in that: bottom described main car frame 1, be provided with wheel, be respectively wheel A (6), wheel B (17), wheel C (18), wheel D (19); Described wheel C (18) and wheel D (19) circumference can freely rotate to control wheeled cable drum carriage working direction, and rear wheel A (6) and wheel B (17) is the non-structure that rotates in a circumferential direction.

4. grounding lattice characteristic parameter test wire device according to claim 1, is characterized in that: described Winder comprises wire spool (3), DC machine 4), driving band (11), storage battery (5) and control unit (21); Wire spool (3) is erected on wheeled cable drum carriage by wire spool support (14), and can rotate freely around wire spool support (14); Subframe (16) and main car frame (1), by outer button nut (15), clamp, carry out axial location to wire spool (3) by described wire spool support (14); Described wire spool (3) side is provided with transmission gear, is connected with DC machine (4) by the driving band (11) on transmission gear; Storage battery (5), DC machine (4) and control unit (21) are arranged in main car frame (1), in the loop that storage battery (5) and DC machine (4) form, be serially connected with control unit (21).

5. grounding lattice characteristic parameter test wire device according to claim 1, it is characterized in that: described counting assembly comprises sensor (7), counting machine (8) and data line (9), sensor (7) sum counter (8) is fixed on main car frame (1), and be connected by data line (9), sensor (7) sum counter (8) couples together and show current wiring distance in real time on counting machine read-out by data line (9); Testing wire (12) around the home on wire spool (3), and has one extract out and walk around from sensor (7), and is incorporated into bottom wheeled cable drum carriage by leading sheave A (10) and leading sheave B (20).

6. utilize the wiring method of grounding lattice characteristic parameter test wire device as claimed in claim 1, it is characterized in that: comprise following control step:

The wiring stage: detain nut (15) and it is taken out from subframe (16) outside tester rotates, by subframe (16) with rotating shaft (13) for axle is opened, wire spool (3) is fixed on main car frame 1 by wire spool support (14), by subframe (16) with rotating shaft (13) for axle close, and outer button nut (15) is rotated in wire spool support (14), by locked to subframe (16) and main car frame (1);

By testing wire (12) extract out and along sensor (7), leading sheave A (10), leading sheave B pass in (20), and penetrate in ground by tap by crooked chisel;

The unwrapping wire stage: tester promotes connecton layout motion by handle 2, testing wire (12) is passed bottom connecton layout, testing wire (12) can be with dynamic sensor (7) synchronous axial system, this hour counter (8) is started working, sensor (7) often rotates a circle and by data line (9), the number of turns can be returned to counting machine (8), can be shown on counting machine (8) screen in real time by current unwrapping wire distance after counting machine (9) calculates;

The take-up stage: the control loop being connected DC machine (4) and storage battery (5) by operation control unit 21, at this moment DC machine (4) starts to rotate, DC machine 4 rotates through driving band (11) and drives wire spool (3) synchronous rotary, and testing wire (12) is reverse under the drive of wire spool (3) to rotate on wire spool (3); After take-up, disconnect control loop by operation control unit (21), wire spool (3) is stopped the rotation, and take-up completes.