CN112198406A - Ship cable water tree length estimation method - Google Patents

Ship cable water tree length estimation method Download PDF

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Publication number
CN112198406A
CN112198406A CN202011079871.9A CN202011079871A CN112198406A CN 112198406 A CN112198406 A CN 112198406A CN 202011079871 A CN202011079871 A CN 202011079871A CN 112198406 A CN112198406 A CN 112198406A
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China
Prior art keywords
cable
water tree
ship
leakage current
length
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CN202011079871.9A
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Chinese (zh)
Inventor
贾小平
韦莎莎
孙成琪
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Guangdong Ocean University
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Guangdong Ocean University
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Priority to CN202011079871.9A priority Critical patent/CN112198406A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention discloses a method for estimating the length of a ship cable water tree, which comprises the following steps: and carrying out leakage current test on the ship cable, calculating the average leakage current value of the ship cable, judging the growth stage of the cable water tree and estimating the length of the cable water tree. The invention has the beneficial effects that: under the condition of not damaging the overall structure of the cable, the length of the ship cable insulation water tree branch can be efficiently, accurately, safely and conveniently estimated, reference is provided for detection and diagnosis of the ship cable insulation state, an important reference value is provided for evaluation of the cable health state, and reliable operation is realized.

Description

Ship cable water tree length estimation method
Technical Field
The invention relates to the field of cable insulation state evaluation, in particular to a method for estimating the water tree length of a ship cable.
Background
With the development of marine economy, the demand of sea island energy is increasing day by day, and the high-voltage cable of the marine structure becomes a link for providing energy support for marine development activities. The high-voltage cable of the marine structure is mainly applied to important occasions such as power supply of island and offshore oil platforms, power transmission of offshore wind farms and the like, and islands close to continents can be connected to a continental power grid by adopting submarine power cables. The marine structure high-voltage cable is complex in structure and heavy in weight, is influenced by various factors such as coiled tension, ocean current impact, load current change and the like in transportation, laying and operation, and is high in working voltage, large in current, long in distance and severe in operation environment, mechanical and electrical properties of the marine structure high-voltage cable are frequently threatened, so that the marine structure high-voltage cable is shorter in service life and higher in failure rate, and huge economic loss is brought to production and life.
The ship high-voltage cable runs on the seabed and bears ship anchoring, tide and ocean current scouring and seawater erosion all the year round, water branches are easily formed on the insulation surface, an electric field enables the water branches to deform and generates mechanical force in the direction of the electric field, a cable insulation polymer chain is broken under the action of the mechanical force, and the water branches are further developed. When the water tree grows to a certain degree, the voltage resistance and tensile strength of the cable insulation are obviously reduced, the water tree is easily changed into an electric tree at the moment, the electric tree continues to develop the cable insulation and is punctured, and safety accidents are induced.
The water tree length in the cable insulation is an important parameter for measuring the insulation performance, and at present, except for directly observing and measuring the water tree length after the cable is sliced, no estimation method for quantifying the water tree length on the premise of keeping the cable complete is provided, so that the estimation method for the water tree length in the ship cable insulation is greatly limited, and therefore an estimation method for the water tree length in the ship cable insulation is urgently needed.
Disclosure of Invention
The invention aims to provide a method for estimating the length of a ship cable water tree.
The technical scheme for realizing the purpose of the invention is as follows:
a method for estimating the length of a ship cable water tree is characterized by comprising
Step 1: carrying out leakage current test on the ship cable:
carrying out leakage current test on the ship cable by using a leakage current tester to obtain n times of leakage current data, and recording as Ia，a＝1，2，...，n，；
Step 2: calculating an average of n leakage current data
Figure BDA0002718147740000011
Figure BDA0002718147740000012
Wherein a is 1, 2.., n;
and step 3: and (3) judging the cable water tree growth stage S:
Figure BDA0002718147740000021
and 4, step 4: estimating the length L of the water branch of the cable:
Figure BDA0002718147740000022
the invention has the beneficial effects that:
under the condition of not damaging the overall structure of the cable, the length of the ship cable insulation water tree branch can be efficiently, accurately, safely and conveniently estimated, reference is provided for detection and diagnosis of the ship cable insulation state, an important reference value is provided for evaluation of the cable health state, and reliable operation is realized.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 is a flowchart of a method for estimating a water tree length of a ship cable, comprising the following steps:
step 1: carrying out leakage current test on the ship cable:
and (3) carrying out leakage current test on the ship cable by using a leakage current tester to obtain leakage current data for 20 times, and recording the leakage current data as Ia，a＝1，2，...，20，IaIn units of microamperes (μ a);
step 2: calculate the average of the 20 leakage current data
Figure BDA0002718147740000023
Figure BDA0002718147740000024
Wherein, a is 1, 2.., 20;
and step 3: and (3) judging the cable water tree growth stage S:
Figure BDA0002718147740000025
and 4, step 4: estimating the length L of the water branch of the cable:
Figure BDA0002718147740000031
the cable water tree length can be estimated according to equation (3), with L in units of micrometers (μm).

Claims (1)

1. A method for estimating the length of a ship cable water tree is characterized by comprising
Step 1: carrying out leakage current test on the ship cable:
carrying out leakage current test on the ship cable by using a leakage current tester to obtain n times of leakage current data, and recording as Ia，a＝1，2，...，n；
Step 2: calculating an average of n leakage current data
Figure FDA0002718147730000011
Figure FDA0002718147730000012
Wherein a is 1, 2.., n;
and step 3: and (3) judging the cable water tree growth stage S:
Figure FDA0002718147730000013
and 4, step 4: estimating the length L of the water branch of the cable:
Figure FDA0002718147730000014
CN202011079871.9A 2020-10-10 2020-10-10 Ship cable water tree length estimation method Pending CN112198406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011079871.9A CN112198406A (en) 2020-10-10 2020-10-10 Ship cable water tree length estimation method

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Application Number Priority Date Filing Date Title
CN202011079871.9A CN112198406A (en) 2020-10-10 2020-10-10 Ship cable water tree length estimation method

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CN112198406A true CN112198406A (en) 2021-01-08

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CN (1) CN112198406A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04223278A (en) * 1990-12-26 1992-08-13 Furukawa Electric Co Ltd:The Diagnosis of cable insulation deterioration
US5276401A (en) * 1990-01-09 1994-01-04 Hitachi Cable, Ltd. Method for diagnosing an insulation deterioration of an electric apparatus
JPH09251003A (en) * 1996-03-15 1997-09-22 Chubu Electric Power Co Inc Testing method for judging life of rubber and plastic cable
CN101367972A (en) * 2008-10-09 2009-02-18 上海交通大学 Preparation method for cross-linked polyethylene water resistant tree insulation material
CN102628906A (en) * 2012-04-24 2012-08-08 天津市电力公司 Aging test device of cross linked polyethylene (XLPE) medium voltage cable water tree
CN103605054A (en) * 2013-11-20 2014-02-26 国家电网公司 10kV crosslinked polyethylene cable water treeing aging detection system
CN110658429A (en) * 2019-11-03 2020-01-07 西南交通大学 Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network
CN111621810A (en) * 2020-07-19 2020-09-04 河南科技大学 Method for reducing cobalt dendrite growth in high-purity cobalt electrolytic refining process

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276401A (en) * 1990-01-09 1994-01-04 Hitachi Cable, Ltd. Method for diagnosing an insulation deterioration of an electric apparatus
JPH04223278A (en) * 1990-12-26 1992-08-13 Furukawa Electric Co Ltd:The Diagnosis of cable insulation deterioration
JPH09251003A (en) * 1996-03-15 1997-09-22 Chubu Electric Power Co Inc Testing method for judging life of rubber and plastic cable
CN101367972A (en) * 2008-10-09 2009-02-18 上海交通大学 Preparation method for cross-linked polyethylene water resistant tree insulation material
CN102628906A (en) * 2012-04-24 2012-08-08 天津市电力公司 Aging test device of cross linked polyethylene (XLPE) medium voltage cable water tree
CN103605054A (en) * 2013-11-20 2014-02-26 国家电网公司 10kV crosslinked polyethylene cable water treeing aging detection system
CN110658429A (en) * 2019-11-03 2020-01-07 西南交通大学 Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network
CN111621810A (en) * 2020-07-19 2020-09-04 河南科技大学 Method for reducing cobalt dendrite growth in high-purity cobalt electrolytic refining process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAKASHI KURIHARA,ET AL: "Investigation of Effects of Length and Width of Water Tree in 6.6 kV XLPE Cable on DC Leakage and AC Superposition Currents by Using Transient Electric Field Analysis", 《2020 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM)》 *

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Application publication date: 20210108