CN110954725A - Method for manufacturing polarization-maintaining delay ring for high-precision fiber current transformer - Google Patents
Method for manufacturing polarization-maintaining delay ring for high-precision fiber current transformer Download PDFInfo
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Abstract
The invention discloses a method for manufacturing a polarization maintaining optical fiber delay ring for a high-precision optical fiber current transformer, which comprises the following steps: adhering a silica gel heat insulation layer on the surface of an inner ring of a framework, dividing a polarization maintaining optical fiber into two parts from the midpoint, clockwise winding the right optical fiber on the silica gel heat insulation layer at the left flange of the framework, uniformly coating ultraviolet curing glue on the silica gel heat insulation layer after the silica gel heat insulation layer is fully wound, irradiating, curing and standing. And starting the anticlockwise winding of the left optical fiber at the left flange of the framework, winding the left optical fiber by a layer, and then repeatedly gluing, curing and standing. And then, clockwise winding the right optical fiber pigtail from the right flange of the framework, winding the optical fiber pigtail by a layer, and repeatedly gluing, curing and standing. And winding the left optical fiber pigtail counterclockwise from the right flange of the framework, winding a layer of the left optical fiber pigtail, and then repeatedly gluing, curing and standing. And repeating the processes of winding, gluing, curing and standing until the optical fiber is completely wound. And (4) placing the wound delay ring into an incubator to release stress, and standing for use.
Description
Technical Field
The invention belongs to a method for manufacturing a polarization-maintaining delay ring for a high-precision fiber current transformer, and particularly relates to a method for manufacturing a high-precision polarization-maintaining fiber delay ring in a fiber current transformer optical path system for power measurement.
Background
The optical fiber current transformer is a novel photoelectric sensor based on Faraday effect and is used for metering current in a high-voltage power grid. Compared with the traditional electromagnetic current transformer, the optical fiber current transformer has the advantages of insulativity, reliability, electromagnetic interference resistance and the like, and can meet the continuously developed requirements in the fields of relay protection control, electric energy metering, electric energy quality monitoring and the like.
At present, the optical fiber current transformer generally adopts an In-line Sagnac light path structure, and compared with a common interference type current transformer, the common light path design has better reciprocity and anti-interference capability. The whole structure is divided into three parts of an optical transmission part, an optical sensing head and a signal processing circuit, and the structure is shown in figure 1. Wherein, the optical transmission part completes the generation, transmission, conversion and interference of optical signals; the optical sensing head senses the current in the wire and converts the current into phase information of interference light; the signal processing circuit generates modulation voltage and resolves the signal to obtain a current value.
The existence of the polarization-maintaining optical fiber delay ring ensures the rapid stabilization of the modulation waveform of the optical fiber current transformer and the accurate positioning of the sampling time point, and is an indispensable component in an optical path system. Generally, the length of the polarization maintaining fiber delay ring optical fiber is about 200 meters, the winding method is to uniformly wind the polarization maintaining fiber on a ring framework from one end, the winding section is as shown in fig. 2, the delay ring is very sensitive to environmental factors such as temperature and stress changes, and stress birefringence is generated under the action of stress (such as external stress, winding stress, bending stress and the like), so that the polarization state output is unstable, and the measurement accuracy of the mutual inductor is influenced. The reasonable winding method is adopted to avoid the generation of stress birefringence, reduce polarization errors and improve the measurement accuracy. The high-precision polarization-maintaining optical fiber delay ring is a very effective means for improving the full-temperature measurement precision of the optical fiber current transformer.
Disclosure of Invention
The invention aims to provide a method for manufacturing a polarization-maintaining delay ring for a high-precision fiber current transformer, which is simple and convenient.
The invention is realized in this way, a method for manufacturing a polarization-maintaining delay ring for a high-precision fiber current transformer, which comprises the following steps,
(1) separating the optical fiber to be wound from the middle point, adhering the silica gel heat insulation layer on the inner surface of the ring framework, and keeping the surface of the silica gel heat insulation layer flat;
(2) aligning the midpoint of the optical fiber obtained in the step (1) with a flange on the left side of a framework, clockwise and spirally winding the optical fiber on the right side of the midpoint on a silica gel heat insulation layer, winding a layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating by using an ultraviolet lamp until the optical fiber is cured, standing, anticlockwise and spirally winding the optical fiber on the left side of the midpoint on the first layer of optical fiber, winding a second layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the second layer of optical fiber, irradiating by using the ultraviolet lamp until the optical fiber is cured, and standing;
(3) spirally winding the first layer of optical fiber tail fiber obtained in the step (2) from the flange on the right side of the framework in a counterclockwise manner, winding a layer of tail fiber, leaving the tail fiber on the left side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating the layer of optical fiber by using an ultraviolet lamp until the optical fiber is cured, and standing; the second layer of optical fiber tail fiber is spirally wound from the flange on the right side of the framework in a counterclockwise way, the tail fiber is left on the left side of the framework after being fully wound by one layer, ultraviolet curing glue is uniformly coated on the layer of optical fiber, and the optical fiber is irradiated by an ultraviolet lamp until the optical fiber is cured and is kept stand;
(4) repeating the steps (2) to (3) until the optical fiber is completely wound;
(5) putting the optical fiber delay ring obtained in the step (4) into a warm box, and enabling the stress of the delay ring to be invalid through 30 high-temperature and low-temperature cycles;
(6) the prepared delay ring is used after standing.
In the step (1), the polarization maintaining optical fiber is a panda polarization maintaining optical fiber with the diameter of 250 mu m, the silica gel heat insulation layer is strip-shaped vulcanized foam silica rubber, and 401 silica gel adhesive is uniformly adhered to the surface of the inner ring of the framework.
And (3) taking the middle point of the optical fiber as a starting point in the step (2), and winding the optical fiber on the right side of the middle point on the surface of the heat insulation layer in a seamless and non-superposed clockwise spiral manner from the left flange of the framework. And (3) winding a layer, uniformly coating ultraviolet curing glue on the surface of the optical fiber layer, irradiating for 5 minutes by using a mercury lamp, and standing for 10 minutes after curing. And then winding the next layer from the left flange of the framework by using the optical fiber on the left side of the middle point in the anticlockwise direction, and repeating the gluing, curing and standing operation.
And (3) winding the tail fiber of the first layer left on the right side on the second layer of optical fiber layer in a spiral manner without gaps from the flange on the right side of the framework and without superposition in a counterclockwise manner, fully winding the tail fiber by one layer, uniformly coating ultraviolet curing glue on the surface of the optical fiber layer, irradiating by a mercury lamp for 5 minutes, and standing for 10 minutes after curing. And winding the tail fiber left on the right side of the second layer from the flange on the right side of the framework to the next layer in a counterclockwise manner, and repeating the gluing, curing and standing operation.
And (4) repeating the step (2) and the step (3) for multiple times in the step (4) until the optical fiber is completely wound.
The temperature variation range in the step (5) is as follows: the temperature circulation from minus 50 ℃ to plus 70 ℃ is carried out at the temperature change rate of 3 ℃/min, and the temperature from low temperature to high temperature and then to low temperature is a circulation, and 30 circulations are carried out.
In the step (6), the mixture is allowed to stand for 24 hours.
The delay ring manufactured by the method has the advantages of reasonable design, simple manufacture, strong operability, good stability at full temperature and high reliability. The delay ring replaces the traditional delay ring to be applied to the optical fiber current transformer, and the measurement precision, stability and reliability of the optical fiber current transformer are improved.
Drawings
FIG. 1 is a schematic diagram of an optical path structure of an In-line Sagnac fiber current transformer;
fig. 2 is a cross-sectional view of a conventional delay ring winding;
FIG. 3 is a schematic diagram of a high precision polarization maintaining fiber delay loop;
FIG. 4 is a cross-sectional view of FIG. 3;
fig. 5 is a flowchart of a method for manufacturing a polarization maintaining delay loop for a high-precision fiber current transformer according to the present invention.
In the figure, 1 light source, 2 coupler, 3 polarizer, 4 phase modulator, 5 polarization-maintaining delay ring, 61/4 wave plate, 7 sensing optical fiber, 8 reflector, 9 signal processing unit, 10 detector, 11 right optical fiber, 12 left optical fiber, 13 ultraviolet curing glue, 14 silica gel heat-insulating layer and 15 skeleton.
Detailed Description
The invention is described in detail below with reference to the following figures and specific embodiments:
a method for manufacturing a polarization-maintaining delay ring for a high-precision fiber current transformer comprises the following steps:
(1) separating the optical fiber to be wound from the middle point, adhering the silica gel heat insulation layer on the inner surface of the ring framework, and keeping the surface of the silica gel heat insulation layer flat;
(2) aligning the midpoint of the optical fiber obtained in the step (1) with a flange on the left side of a framework, clockwise and spirally winding the optical fiber on the right side of the midpoint on a silica gel heat insulation layer, winding a layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating by using an ultraviolet lamp until the optical fiber is cured, standing, anticlockwise and spirally winding the optical fiber on the left side of the midpoint on the first layer of optical fiber, winding a second layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the second layer of optical fiber, irradiating by using the ultraviolet lamp until the optical fiber is cured, and standing;
(3) spirally winding the first layer of optical fiber tail fiber obtained in the step (2) from the flange on the right side of the framework in a counterclockwise manner, winding a layer of tail fiber, leaving the tail fiber on the left side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating the layer of optical fiber by using an ultraviolet lamp until the optical fiber is cured, and standing; the second layer of optical fiber tail fiber is spirally wound from the flange on the right side of the framework in a counterclockwise way, the tail fiber is left on the left side of the framework after being fully wound by one layer, ultraviolet curing glue is uniformly coated on the layer of optical fiber, and the optical fiber is irradiated by an ultraviolet lamp until the optical fiber is cured and is kept stand;
(4) repeating the steps (2) to (3) until the optical fiber is completely wound;
(5) putting the optical fiber delay ring obtained in the step (4) into a warm box, and enabling the stress of the delay ring to be invalid through 30 high-low temperature cycles (-50 ℃ to +80 ℃, 3 ℃/min rate change, and one cycle from low temperature to high temperature to low temperature;
(6) the prepared delay ring is used after standing.
The polarization maintaining optical fiber in the step (1) is a panda polarization maintaining optical fiber with the diameter of 250 mu m, the silica gel heat insulation layer is strip-shaped vulcanized foam silica rubber, and 401 silica gel adhesive is uniformly adhered to the surface of the inner ring of the framework;
and (3) taking the middle point of the optical fiber as a starting point in the step (2), and winding the optical fiber on the right side of the middle point on the surface of the heat insulation layer in a seamless and non-superposed clockwise spiral manner from the left flange of the framework. And (3) winding a layer, uniformly coating Ultraviolet (UV) curing glue on the surface of the optical fiber layer, irradiating for 5 minutes by using a mercury lamp, and standing for 10 minutes after curing. Then winding the next layer from the left flange of the framework in the anticlockwise direction by using the optical fiber on the left side of the middle point, and repeating the gluing, curing and standing operation;
and (3) winding the tail fiber of the first layer left on the right side on the second layer of optical fiber layer in a spiral manner without gaps from the flange on the right side of the framework and without superposition in a counterclockwise manner, fully winding the tail fiber by one layer, uniformly coating Ultraviolet (UV) curing glue on the surface of the optical fiber layer, irradiating the surface of the optical fiber layer by a mercury lamp for 5 minutes, and standing the fiber layer for 10 minutes after curing. Then winding the next layer of tail fibers left on the right side of the framework from the flange on the right side of the framework in the anticlockwise direction, and repeating the gluing, curing and standing operation;
repeating the step (2) and the step (3) for multiple times in the step (4) until the optical fiber is completely wound;
the temperature variation range in the step (5) is as follows: the temperature circulation from minus 50 ℃ to plus 70 ℃ is carried out at the temperature change rate of 3 ℃/min, and the temperature from low temperature to high temperature and then to low temperature is a circulation, and 30 circulations are carried out.
The step (6) requires 24 hours of standing.
The specific manufacturing process is shown in fig. 5, and the manufacturing of the high-precision polarization maintaining optical fiber delay ring comprises the following steps:
firstly, the preparation method comprises the following specific steps: a panda polarization maintaining optical fiber with the diameter of 250 mu m is divided into a right optical fiber 11 and a left optical fiber 12 from the middle point, and a silica gel heat insulating layer 14 made of strip-shaped vulcanized foam silicon rubber is uniformly adhered to the surface of an inner ring of a framework 15 by using 401 silicon rubber adhesive.
Then, the middle point of the optical fiber is aligned with the left flange of the framework 15, and the right optical fiber 11 is wound on the surface of the heat insulation layer 24 in a seamless and non-superposed clockwise spiral manner from the left flange of the framework by taking the middle point of the optical fiber as a starting point. And (3) winding a layer, uniformly coating Ultraviolet (UV) curing adhesive 23 on the surface of the optical fiber layer, irradiating for 5 minutes by using a mercury lamp, and standing for 10 minutes after curing. Then winding the next layer of the optical fiber 12 from the left flange of the framework 15 in the anticlockwise direction, and repeating the gluing, curing and standing operation;
and then, winding the tail fiber of the right optical fiber 11 on a second optical fiber layer in a seamless and non-superposed anticlockwise spiral mode from the right flange of the framework 15, fully winding the tail fiber, uniformly coating Ultraviolet (UV) curing glue 13 on the surface of the optical fiber layer, irradiating by a mercury lamp for 5 minutes, and standing for 10 minutes after curing. And then winding the tail fiber of the left optical fiber 12 from the flange of the right side of the framework 15 to the next layer in a counterclockwise way, and repeating the gluing, curing and standing operation. Repeating the winding operation from left to right and from right to left until the optical fiber is completely wound;
and finally, placing the wound delay ring into a warm box, performing temperature circulation from-50 ℃ to +70 ℃ at a variable temperature rate of 3 ℃/min, wherein the temperature is changed from low temperature to high temperature to low temperature into a circulation, and performing 30 circulations to release the stress of the delay ring. After the end, the delay ring is left for 24 hours and then used.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
1. A method for manufacturing a polarization-maintaining delay ring for a high-precision fiber current transformer is characterized by comprising the following steps: which comprises the following steps of,
(1) separating the optical fiber to be wound from the middle point, adhering the silica gel heat insulation layer on the inner surface of the ring framework, and keeping the surface of the silica gel heat insulation layer flat;
(2) aligning the midpoint of the optical fiber obtained in the step (1) with a flange on the left side of a framework, clockwise and spirally winding the optical fiber on the right side of the midpoint on a silica gel heat insulation layer, winding a layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating by using an ultraviolet lamp until the optical fiber is cured, standing, anticlockwise and spirally winding the optical fiber on the left side of the midpoint on the first layer of optical fiber, winding a second layer of tail fiber on the right side of the framework, uniformly coating ultraviolet curing glue on the second layer of optical fiber, irradiating by using the ultraviolet lamp until the optical fiber is cured, and standing;
(3) spirally winding the first layer of optical fiber tail fiber obtained in the step (2) from the flange on the right side of the framework in a counterclockwise manner, winding a layer of tail fiber, leaving the tail fiber on the left side of the framework, uniformly coating ultraviolet curing glue on the layer of optical fiber, irradiating the layer of optical fiber by using an ultraviolet lamp until the optical fiber is cured, and standing; the second layer of optical fiber tail fiber is spirally wound from the flange on the right side of the framework in a counterclockwise way, the tail fiber is left on the left side of the framework after being fully wound by one layer, ultraviolet curing glue is uniformly coated on the layer of optical fiber, and the optical fiber is irradiated by an ultraviolet lamp until the optical fiber is cured and is kept stand;
(4) repeating the steps (2) to (3) until the optical fiber is completely wound;
(5) putting the optical fiber delay ring obtained in the step (4) into a warm box, and enabling the stress of the delay ring to be invalid through 30 high-temperature and low-temperature cycles;
(6) the prepared delay ring is used after standing.
2. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: in the step (1), the polarization maintaining optical fiber is a panda polarization maintaining optical fiber with the diameter of 250 mu m, the silica gel heat insulation layer is strip-shaped vulcanized foam silica rubber, and 401 silica gel adhesive is uniformly adhered to the surface of the inner ring of the framework.
3. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: and (3) taking the middle point of the optical fiber as a starting point in the step (2), and winding the optical fiber on the right side of the middle point on the surface of the heat insulation layer in a seamless and non-superposed clockwise spiral manner from the left flange of the framework. And (3) winding a layer, uniformly coating ultraviolet curing glue on the surface of the optical fiber layer, irradiating for 5 minutes by using a mercury lamp, and standing for 10 minutes after curing. And then winding the next layer from the left flange of the framework by using the optical fiber on the left side of the middle point in the anticlockwise direction, and repeating the gluing, curing and standing operation.
4. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: and (3) winding the tail fiber of the first layer left on the right side on the second layer of optical fiber layer in a spiral manner without gaps from the flange on the right side of the framework and without superposition in a counterclockwise manner, fully winding the tail fiber by one layer, uniformly coating ultraviolet curing glue on the surface of the optical fiber layer, irradiating by a mercury lamp for 5 minutes, and standing for 10 minutes after curing. And winding the tail fiber left on the right side of the second layer from the flange on the right side of the framework to the next layer in a counterclockwise manner, and repeating the gluing, curing and standing operation.
5. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: and (4) repeating the step (2) and the step (3) for multiple times in the step (4) until the optical fiber is completely wound.
6. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: the temperature variation range in the step (5) is as follows: the temperature circulation from minus 50 ℃ to plus 70 ℃ is carried out at the temperature change rate of 3 ℃/min, and the temperature from low temperature to high temperature and then to low temperature is a circulation, and 30 circulations are carried out.
7. The method for manufacturing the polarization-maintaining delay ring for the high-precision fiber current transformer as claimed in claim 1, wherein the method comprises the following steps: in the step (6), the mixture is allowed to stand for 24 hours.
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Application publication date: 20200403 |