CN111830346B - Power cable water inflow evaluation test method based on pressure detection - Google Patents
Power cable water inflow evaluation test method based on pressure detection Download PDFInfo
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- CN111830346B CN111830346B CN202010668091.1A CN202010668091A CN111830346B CN 111830346 B CN111830346 B CN 111830346B CN 202010668091 A CN202010668091 A CN 202010668091A CN 111830346 B CN111830346 B CN 111830346B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a power cable water inlet evaluation test method based on pressure detection, which comprises the steps of arranging sensors, setting nodes and water inlet points, grouping to perform simulation experiments and the like. The grouped simulation experiment comprises a reference group, a load control group and a water inlet control group. The invention utilizes the humidity pressure sensor laid on the cable filling layer and combines the actual working environment to carry out a plurality of groups of experiments, thereby providing a basis for judging the threshold value of various water inlet conditions of the cable and having important reference significance for realizing the on-line monitoring of the water inlet of the cable.
Description
Technical Field
The invention relates to a cable water inflow experiment method, in particular to a power cable water inflow evaluation experiment method based on pressure detection.
Background
In the power cable fault, faults caused by water inflow inside the cable are caused by various factors, and the power utilization quality of a user is greatly influenced. Therefore, on-line monitoring for the cable water inflow problem is required, so as to prevent such faults from occurring in time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a power cable water inflow evaluation test method based on pressure detection. The power cable water inflow evaluation test method based on pressure detection is simple and can provide a basis for detection equipment development.
The purpose of the invention is realized by the following technical scheme: the power cable water inflow evaluation test method based on pressure detection comprises the following steps:
s1, sensor arrangement: selecting a section of cable, and laying a humidity pressure sensor consisting of hydrophilic rubber and fiber bragg gratings on a filling layer of the cable;
s2, setting nodes and water inlet points: uniformly marking nodes along the axial direction of the cable, wherein the distance between every two adjacent nodes is D, and sequencing and numbering the nodes; carrying out damage operation at any position of the cable to set a water inlet point;
s3, grouping and carrying out simulation experiments:
reference group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node1(ii) a Water is injected at a water inlet point, the water injection amount is W,standing for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each node at present2Calculating the pressure value F corresponding to each node1And a pressure value F2The difference between them, then power off to restore the cable to the initial state;
load control group: keeping the drying condition, and applying a current I to the cableRANDOMWherein 0 is less than or equal to IRANDOM≤IMAXAfter the cable runs stably, recording the pressure value F of each current node3(ii) a Injecting water at the water inlet point, wherein the water injection amount is W, standing for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each current node4Calculating the pressure value F corresponding to each node3And a pressure value F4The difference between them, then power off to restore the cable to the initial state;
water inlet control group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node5(ii) a Water is injected at the water inlet point, and the water injection quantity is WRANDOMWherein W is not less than 0RANDOMStanding for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each node at present6Calculating the pressure value F corresponding to each node5And a pressure value F6The difference between them, and then power is cut off to restore the cable to its original state.
Preferably, in step S1, the humidity pressure sensor is laid in a spiral manner or a straight manner.
Preferably, in step S2, the distance D is 10cm to 20 cm.
Preferably, in step S3, the current IMAXThe size determination step is as follows: setting the core temperature of the cable at normal temperature as initial temperature and the core maximum temperature of the cable at 90 deg.c during full-load operation of the cable, and determining I with the heat path calculation formulaMAXThe size of (2).
Preferably, in step S3, the water inflow W is equal to the single maximum water inflow of the cable known from the statistics of the water inflow faults of the local cable.
Compared with the prior art, the invention has the following advantages:
1. according to the power cable water inflow evaluation test method based on pressure detection, the humidity pressure sensor is adopted to measure the pressure before and after the cable is subjected to water inflow, the test operation is easy to realize, and the simultaneous pressure detection can provide a direction for the development of new equipment so as to improve the technical means and reliability of cable operation and maintenance.
2. According to the power cable water inflow evaluation test method based on pressure detection, the humidity pressure sensor laid on the cable filling layer is utilized, and then multiple groups of experiments are carried out in combination with the actual working environment, so that a basis is provided for threshold judgment of various water inflow conditions of the cable, and the method has important reference significance for realizing online monitoring of cable water inflow.
Drawings
Fig. 1 is a schematic structural diagram of a humidity pressure sensor used in a power cable water inflow evaluation test method based on pressure detection according to the present invention.
Fig. 2 is a schematic structural diagram of a cable used in the power cable water inflow assessment test method based on pressure detection according to the present invention.
Wherein, 1 is hydrophilic rubber, 2 is fiber grating, 3 is the cable, 4 is the breakage point, 5 is the filling layer, 6 is the sinle silk.
Detailed Description
The invention is further illustrated by the following figures and examples.
The method for evaluating and testing the water inflow of the power cable based on the pressure detection as shown in FIG. 1 comprises the following steps:
s1, sensor arrangement: selecting a section of cable, and laying a humidity pressure sensor consisting of hydrophilic rubber and fiber bragg gratings on a filling layer of the cable; specifically, in this embodiment, the humidity pressure sensor is spirally laid on the filling layer of the cable, that is, the humidity pressure sensor is spirally arranged relative to the core of the cable.
S2, node andthe water inlet point is set: uniformly marking nodes along the axial direction of the cable, wherein the distance between every two adjacent nodes is D, and sequencing and numbering the nodes; as shown in fig. 2, a breaking operation is performed at an arbitrary position of the cable to set a water inlet point; in this embodiment, the distance is 15 cm. Each node is pressed as a node T1、T2、T3… …, sequencing and numbering to facilitate recording the relative pressure value of each node during the subsequent grouping experiment, and calculating the difference between the two pressure values before and after.
S3, grouping and carrying out simulation experiments:
reference group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node1(ii) a Injecting water at a water inlet point, wherein the water injection amount is W, standing for a certain time, and the standing time in the embodiment is 60-90 minutes so as to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each current node2Calculating the pressure value F corresponding to each node1And a pressure value F2The difference between them, then power off to restore the cable to the initial state;
load control group: keeping the drying condition, and applying a current I to the cableRANDOMWherein 0 is less than or equal to IRANDOM≤IMAXAfter the cable runs stably, recording the pressure value F of each current node3(ii) a Injecting water at a water inlet point, wherein the water injection amount is W, standing for a certain time, and the standing time in the embodiment is 60-90 minutes so as to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each current node4Calculating the pressure value F corresponding to each node3And a pressure value F4The difference between them, then power off to restore the cable to the initial state;
water inlet control group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node5(ii) a Water is injected at the water inlet point, and the water injection quantity is WRANDOMWherein W is not less than 0RANDOMW is less than or equal to W, the standing time is 60-90 minutes in the embodiment, so that the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor is balanced, and the pressure value F of each current node is recorded6Calculating the pressure value F corresponding to each node5And a pressure value F6The difference between them, and then power is cut off to restore the cable to its original state.
In the above, the initial state refers to the current I applied to the cable under the condition that the core temperature is 90 ℃, that is, the cable is in full load operationMAXAnd after the weight of the cable is maintained to be unchanged, the power is cut off, the residual charge of the cable is subjected to discharge treatment, and the wire core is cooled to room temperature, wherein the state at the moment is called as the initial state of the cable. While the current I is applied to the cableMAXWhen the temperature of the cable is not changed any more and the pressure value measured by the humidity pressure sensor is kept unchanged for 30mins, the cable can be considered to be stably operated.
In step S1, the moisture pressure sensor is laid in a spiral manner or a linear manner. Specifically, the spiral laying means that the humidity pressure sensors are spirally distributed relative to a wire core of the cable; and the linear laying means that the humidity pressure sensors are distributed in parallel relative to the wire core of the cable. The pressure values before and after water inlet can be measured in real time by the two laying modes. In this embodiment, the moisture pressure sensor is laid spirally.
In step S2, the distance D is 10-20 cm. A distance of suitable size is used to ensure the accuracy of the measurement.
In step S3, the current IMAXThe size determination step is as follows: setting the core temperature of the cable at normal temperature as initial temperature and the core maximum temperature of the cable at 90 deg.c during full-load operation of the cable, and determining I with the heat path calculation formulaMAXThe size of (2). The operation is simple, and the test is ensured to be effectively carried out.
In step S3, the water injection amount W is equal to the single maximum water inflow of the cable known from the local cable water inflow fault statistics. The operation of the method is easy to realize so as to simulate a real environment. Meanwhile, in order to further improve the real environment, the components of the water can be adjusted, namely the salt content, the soil and the like in the water are adjusted.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. The power cable water inflow evaluation test method based on pressure detection is characterized by comprising the following steps of:
s1, sensor arrangement: selecting a section of cable, and laying a humidity pressure sensor consisting of hydrophilic rubber and fiber bragg gratings on a filling layer of the cable;
s2, setting nodes and water inlet points: uniformly marking nodes along the axial direction of the cable, wherein the distance between every two adjacent nodes is D, and sequencing and numbering the nodes; carrying out damage operation at any position of the cable to set a water inlet point;
s3, grouping and carrying out simulation experiments:
reference group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node1(ii) a Injecting water at water inlet point, wherein the water injection amount is W, standing for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each node at present2Calculating the pressure value F corresponding to each node1And a pressure value F2The difference between them, then power off to restore the cable to the initial state;
load control group: keeping the drying condition, and applying a current I to the cableRANDOMWherein 0 is less than or equal to IRANDOM≤IMAXAfter the cable runs stably, recording the pressure value F of each current node3(ii) a Injecting water at the water inlet point, wherein the water injection amount is W, standing for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each current node4Calculating each node phaseCorresponding pressure value F3And a pressure value F4The difference between them, then power off to restore the cable to the initial state;
water inlet control group: applying a current I to the cable under dry conditionsMAXAfter the cable runs stably, recording the pressure value F of each current node5(ii) a Water is injected at the water inlet point, and the water injection quantity is WRANDOMWherein W is not less than 0RANDOMStanding for a certain time to balance the water exchange between the filling layer of the cable and the hydrophilic rubber of the humidity pressure sensor, and recording the pressure value F of each node at present6Calculating the pressure value F corresponding to each node5And a pressure value F6The difference between them, and then power is cut off to restore the cable to its original state.
2. The power cable water inflow assessment test method based on pressure detection as claimed in claim 1, characterized in that: in step S1, the moisture pressure sensor is laid in a spiral manner or a linear manner.
3. The power cable water inflow assessment test method based on pressure detection as claimed in claim 1, characterized in that: in step S2, the distance D is 10-20 cm.
4. The power cable water inflow assessment test method based on pressure detection as claimed in claim 1, characterized in that: in step S3, the current IMAXThe size determination step is as follows: setting the core temperature of the cable at normal temperature as initial temperature and the core maximum temperature of the cable at 90 deg.c during full-load operation of the cable, and determining I with the heat path calculation formulaMAXThe size of (2).
5. The power cable water inflow assessment test method based on pressure detection as claimed in claim 1, characterized in that: in step S3, the water injection amount W is equal to the single maximum water inflow of the cable known from the local cable water inflow fault statistics.
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Address after: 510640 Tianhe District, Guangdong, No. five road, No. 381, Applicant after: SOUTH CHINA University OF TECHNOLOGY Applicant after: Guangzhou Nanyang cable group Co.,Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Applicant before: SOUTH CHINA University OF TECHNOLOGY Applicant before: GUANGZHOU NANYANG CABLE Co.,Ltd. |
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