WO2013071788A1

WO2013071788A1 - Temperature cycling test device for optical fiber composite phase conductor connector box and test method

Info

Publication number: WO2013071788A1
Application number: PCT/CN2012/081286
Authority: WO
Inventors: 戚力彦; 许高雄
Original assignee: 中国电力科学研究院; 国家电网公司
Priority date: 2011-11-17
Filing date: 2012-09-12
Publication date: 2013-05-23
Also published as: CN102519711A

Abstract

A temperature cycling test device for an optical fiber composite phase conductor connector box (1) comprises an auxiliary extension optical cable (2), a high/low-temperature test box (3) and an optical fiber attenuation tester or optical time-domain reflectometer (4). The high/low-temperature test box (3) is used to simulate the dynamically changing external environment for the optical fiber composite phase conductor connector box (1) so that the temperature range of the high/low-temperature cycling test is flexible and controllable and better conforms to the practical environment. Also provided is a temperature cycling test method for an optical fiber composite phase conductor connector box, comprising the following steps: splicing and coiling optical fiber in the connector box body, sealing the connector box body, splicing test auxiliary extension optical fiber composite phase conductor optical cable, configuring the optical fiber attenuation tester, performing an attenuation test. The test method is used for studying the performance change of the optical fiber composite phase conductor connector box at an extremely low temperature and an extremely high temperature so as to ensure safety and stability in operation of the practical engineering. Through the splicing of the test auxiliary extension optical fiber composite phase conductor optical cable, a sufficiently long optical fiber channel is provided for the optical fiber attenuation monitoring by connecting the optical fibers in series, thereby ensuring the reliability of the test result.

Description

Optical fiber composite phase line joint box temperature cycle test device and test method

The invention belongs to the field of performance testing of a 500 kV optical fiber composite phase line joint box, and particularly relates to a temperature cycle test device and a test method for a fiber composite phase line connector box.

BACKGROUND OF THE INVENTION Optical Fiber Composite Phase Conductor (OPPC) is a new type of electric special optical cable developed in recent years. It is installed as a common phase line in power transmission and transformation lines, which can prevent 0PGW from being struck by lightning. Fatal problems such as broken strands, broken fibers, etc., while avoiding electrochemical corrosion of the outer sheath of the ADSS. The fiber-optic composite phase line has the functions of wires and communication cables, and has been applied in power transmission lines such as 10kV, 35kV, l lOkV and 220kV in China's power sector.

The wide application of fiber composite phase line relies on the advancement of 0PPC pre-twisted power fittings and the design and manufacturing technology of high-voltage insulated joint boxes in the line. Between the OPPCs erected on the tower, and between the OPPC and the guide cable, a splice box is required for connection. In OPPC, since the current and communication signals are transmitted in one cable, the communication signal in the connector box is required to be connected to the zero potential level to safely and reliably isolate the high voltage and signal. At the same time, the OPPC is energized for a long time and there is a certain Temperature, which puts further demands on the performance of the joint box. The OPPC connector box includes a middle connector box and a terminal connector box. The intermediate connector box is connected between the lines on the tower, and the terminal connector box is connected by the upper and lower welding, so that the communication signal can be safely transmitted.

Regarding the joint box temperature cycle test, the high and low temperature cycle test conditions of the joint box are specified in YD/T814.1-2004. Place the sample in the temperature control box at room temperature, raise the temperature to the specified high temperature at rC/min, keep the temperature at high temperature for 2h, then the temperature is lowered to room temperature, and the temperature is kept at room temperature for 2h, then lowered to low temperature, and the temperature is lowered at low temperature. 2h, warmed to room temperature, and kept at room temperature for 2h. This temperature cycle test mainly considers the change of the gas pressure caused by the temperature change in the joint box. Since the temperature rise causes the air pressure in the joint box to rise, the airtightness of the joint box is required to be high. The high and low temperature cycle test conditions of the joint box are shown in Table 1.

Table 1 joint box high and low temperature cycle test conditions

Class IIA | Class B I Maximum temperature rc) 60 65

Minimum temperature rc) -25 -40

The fiber connection loss is due to the imperfection of the connection point. There are many factors that affect the imperfection of the connection point. There are two categories, namely external and internal factors. The internal factor refers to the imperfection of the fiber itself. It cannot reduce the loss by improving the connection process. It includes core diameter mismatch, refractive index mismatch, poor fiber concentricity, and mode field diameter mismatch. Therefore, in the connection test, the connection loss The value will be large and negative. The unidirectional value can be made smaller by multiple connections, and the average value tends to zero, but the positive and negative phenomena cannot be avoided, and the positive and negative phenomena have a certain influence on the optical fiber transmission loss. In the project, the same batch of factory-made optical cables should be selected when the optical cables are used for distribution. The A and B terminals should be matched one by one, and the artificial connection process should be improved to reduce the connection loss.

The external factor refers to the imperfection of the non-fiber itself, but the connection process is poor, including the lateral position of the core, the longitudinal direction, the deviation of the axial angle of the fiber, and the end face contamination of the fiber. This is because the maintenance of the fusion splicer is not timely during the connection process. Due to human factors such as improper operation, the connection loss is too large.

Disc fiber is a technology, scientific disc fiber method, which can make the fiber layout reasonable, the additional loss is small, the time and the harsh environment can be tested, and the fiber breakage caused by extrusion can be avoided. The method of disc fiber: First, the middle and the back side, that is, the heat-shrinkable sleeves are placed one by one in the fixing groove, and then the remaining fibers are processed on both sides. If the individual fibers are too long or too short, they can be placed at the end. Separately coiled.

At the same time, the structure of the reserved pigtail inside the joint box will also cause the attenuation after the temperature change to be too large. For example, the excess length of the fiber in the tight structure is too small, and the fiber will be tightened under low temperature conditions, resulting in increased attenuation. Large, so the temperature cycle test is also an important means to investigate whether the structure of the reserved pigtail inside the joint box is reasonable.

It has already had certain applications in the power transmission lines of 10kV, 35kV, l lOkV and 220kV in China's power sector. There is no application example for the fiber composite phase line of the 500kV voltage class line. There is no research on the development and performance testing of the OPPC connector box for the 500kV fiber composite phase line. The fiber optic composite phase line connector box is an indispensable device in OPPC line engineering applications, and its corresponding performance detection technology is a new technology. The temperature cycle test method of the optical fiber composite phase wire joint box is used to carry out the temperature cycle test of the fiber composite phase line joint box, and the performance change of the fiber composite phase line joint box under the conditions of extremely low temperature and extremely high temperature is investigated to ensure the safe and stable operation of the actual project. . Therefore, the development and application of the temperature cycle test device has great economic value, and can promote the application of the fiber composite phase line in the 500kV voltage class line.

SUMMARY OF THE INVENTION The present invention is to provide a fiber optic composite phase wire joint box temperature cycle test device and test method, simulation actual The performance change of the joint box seal and the tail fiber optical transmission characteristics under harsh environmental conditions, the test-assisted extension of the OPPC cable facilitates the accurate test of the transmission characteristics of the pigtail in the joint box, and passes the test values under low temperature or high temperature conditions and the test values at normal temperature. In contrast, the performance problems of the joint box are found in time, which is beneficial to improve product quality.

In order to achieve the above object, the technical solution adopted by the present invention is:

An optical fiber composite phase line joint box temperature cycle test device, the device comprising a high and low temperature test box, an auxiliary extension cable and a fiber attenuation tester (or an optical time domain reflectometer); the improvement is that the device comprises Auxiliary extension cable and fiber attenuation tester (or optical time domain reflectometer) connected to the connector box.

Wherein: the connector box is provided with a reserved pigtail, and the pigtail is connected in series with the auxiliary extension cable, and the total length of the serial fiber is greater than

500m.

Wherein: the pigtail and the auxiliary extension cable serial connector are fixed inside the joint box.

Wherein: the radius of curvature of the remaining optical fiber coil in the joint box is not less than 30.0 mm.

A test method based on the test apparatus of claim 1 wherein the method steps are as follows:

1) The internal fiber optic connection of the connector box body is placed:

The multi-core fiber inside the pigtail of the connector box is connected in series with the fiber inside the auxiliary extension optical unit, and the pigtail and the serial connector are regularly placed in the inner fiberboard of the connector box, and the radius of curvature of the remaining fiber coil in the box is not less than 30.0mm;

2) Perform high and low temperature cycle tests:

Method 1: Using the optical time domain reflectometer to test the attenuation coefficient of the serially connected fiber at room temperature, as a comparison benchmark for the subsequent test change values, and then set the high and low temperature test chamber to lower the temperature from room temperature to low temperature Ti, after 12 hours of heat preservation Test the attenuation of the series fiber attenuation, and then heat up to the high temperature T _h . After 12 hours of heat preservation, test the attenuation variation of the series fiber, compare the low temperature and high temperature test results with the test values at normal temperature, and judge according to the relevant engineering requirements. Complete a complete temperature cycle;

Method 2: First open the fiber attenuation tester at normal temperature, test the attenuation curve at a normal temperature as a reference, then adjust the high and low temperature test chamber, the temperature is lowered from room temperature to low temperature Ti, heat preservation for 12h, and then warmed to high temperature T _h , heat preservation 12h The fiber attenuation tester continuously tests the whole process of the temperature cycle, records the test result, analyzes and judges according to the test result curve, and completes a complete temperature cycle;

3) Connector box body seal:

After the internal fiber of the connector box is connected, the seal is installed and then filled with 1 atmosphere. After the temperature cycle test is completed, return to normal temperature and observe the pressure gauge of the joint box. The pressure value varies within ±0.05 atmospheres for the joint box to be sealed.

Wherein: the high temperature temperature T _h ≤ +85 ° C, the low temperature temperature 1 ^ - 401.

Due to the adoption of the above technical solutions, the advantages of the present invention are compared with the prior art, including: 1) The device of the invention adopts a high and low temperature test box to provide a dynamic change of the external environment simulation for the OPPC joint box, so that the temperature range of the high and low temperature temperature cycle test is flexible and controllable, and is more suitable for the actual environment;

2) The fiber optic connection and the disk placement of the connector box are carried out according to the specific requirements of the actual engineering line conditions. The protection of the fiber fusion point and the bending radius can reflect the internal condition of the actual line connector box and ensure the applicability of the test results;

3) Test-assisted extension OPPC cable connection provides fiber-optic channels of sufficient length for fiber attenuation monitoring through fiber-optic series connection;

4) The fiber attenuation tester continuously monitors the fiber attenuation during the entire temperature cycle test, and records the data to make the test data more horizontally comparable, which intuitively reflects the overall fluctuation of the fiber attenuation during the test;

5) The optical time domain reflectometer can be tested at critical time points without continuous monitoring. The two test methods can be selected according to the needs, and the transmission performance of the reserved fiber in the joint box can be conveniently tested and analyzed. Easy data comparison;

6) The temperature cycle device is simple in structure, easy to operate, easy to control in time and temperature, and the test results are intuitive and clear, which can facilitate the improvement of the joint box.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be further described with reference to the accompanying drawings.

1 is a schematic diagram of a temperature cycle test device of a fiber composite phase line joint box;

Reference mark:

1- Connector Box, 2-Test Auxiliary Extension OPPC Cable, 3-Temperature Test Chamber, 4-Fiber Attenuation Tester (or Optical Time Domain Reflector).

detailed description

The present invention will be described in detail below with reference to examples.

The object of the present invention is to solve the problems existing in the application of OPPC engineering, and propose a temperature cycle test device for a fiber optic composite phase wire joint box, which can simulate the test box in the laboratory to test the OPPC running line at extremely low temperature and extremely high temperature. Performance changes under conditions.

The optical fiber composite phase wire joint box temperature cycle test device is composed of OPPC joint box 1 itself, high and low temperature test chamber 3, auxiliary extension cable 2 and fiber attenuation tester (or optical time domain reflectometer) 4, and performs OPPC joint box temperature cycle test. The simulation diagram is shown in Figure 1.

The temperature cycle test method includes the internal fiber optic splice tray of the splice case, the joint box 1 box seal, the test assistant to extend the connection of the OPPC cable 2, the fiber attenuation tester (or optical time domain reflectometer) configuration, the attenuation test method, etc. step. During the test, two temperature cycles were performed: each complete cycle lasted for 24 hours, of which 12 hours high temperature, 12 hours low temperature, high temperature, low temperature specific temperature were determined according to the test requirements.

The inner box of the connector box 1 is connected with the fiber: The OPPC connector box 1 has a reserved pigtail inside. The multi-core fiber inside the pigtail is connected with the internal fiber of the test auxiliary extension cable 2 to ensure the serial fiber. The length is greater than 500 meters. The contiguous reserved fiber and fiber connector shall be placed in the inner panel of the connector box 1 in a regular and orderly manner to fix the connector and ensure that the bending radius of the fiber is large enough.

Connector box 1 Box seal: Actual circuit OPPC connector box 1 Long-term work in harsh environments, it is necessary to seal the box during laboratory tests. The box seal is realized by a sealing ring combined with hot melt adhesive.

Test-assisted extension OPPC cable connection: In the test, to ensure the accuracy of fiber attenuation monitoring, the total length of the measured fiber should be greater than 500 meters. Normally, the internal pigtails of the connector box are connected in series with the external test assistant extension OPPC cable, so that the total length of the series fiber meets the test requirements.

Fiber Attenuation Tester 4: During the test, the fiber attenuation tester 4 was used to continuously test the fiber attenuation during the whole process of temperature cycling, and the test results were recorded.

Or use an optical time domain reflectometer to test the fiber attenuation at critical time points and record the test results.

The invention utilizes the existing high and low temperature test chambers of the laboratory, sets the temperature value and duration required for the test, and places the joint box 1 in the temperature environment to simulate the performance of the joint box sealing and the pigtail transmission characteristics under the actual harsh environmental conditions. Variety.

The device of the invention is the simplest solution under the laboratory condition, the device is simple, the time and the temperature are easy to control, and the OPPC cable is extended by the test to facilitate the accurate test of the transmission characteristics of the pigtail in the joint box 1, and the low temperature or high temperature condition is adopted. The test value is compared with the test value at normal temperature, and the performance problem of the joint box 1 is found in time, thereby contributing to improvement of product quality.

The device of the invention can test the sealing performance of the joint box 1 and reflect the performance of the pigtail transmission characteristics, and provide a reference for the quality control and improvement design of the joint box 1. The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the invention. The exemplified embodiments are merely illustrative, and are not intended to limit the scope of the invention, the scope of the invention is defined by the appended claims.

Claims

Rights request

What is claimed is: 1. A fiber optic composite phase wire joint box temperature cycle test device, the device comprising a high and low temperature test chamber (3); characterized in that the device comprises an auxiliary extension cable connected to the joint box (1) (2) ) and fiber attenuation tester or optical time domain reflectometer (4).

2. The apparatus of claim 1, wherein the connector box (1) is provided with a reserved pigtail, a pigtail and an auxiliary extension cable (2). Connected, the total length of the serial fiber is greater than 500m.

3. The optical fiber composite phase wire joint box temperature cycle test device according to claim 1 or 2, wherein the pigtail and the auxiliary extension cable (2) serial connector are fixed inside the joint box (1) .

4. The optical fiber composite phase line junction box temperature cycle test apparatus according to claim 1 or 2, wherein a radius of curvature of the remaining optical fiber coils in the joint box is not less than 30.0 mm.

5. A test method based on the test apparatus of claim 1 wherein the method steps are as follows:

1) The internal fiber optic connection of the connector box body is placed:

2) Perform high and low temperature cycle tests:

3) Connector box body seal:

6. A test method according to claim 5, characterized in that said high temperature temperature T _h ≤ +85 ° C and the low temperature temperature 1 ^ - 40 °. .