CN110018393A - A kind of detection of XLPE cable connector abnormal heating and assessment method - Google Patents
A kind of detection of XLPE cable connector abnormal heating and assessment method Download PDFInfo
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- CN110018393A CN110018393A CN201910297630.2A CN201910297630A CN110018393A CN 110018393 A CN110018393 A CN 110018393A CN 201910297630 A CN201910297630 A CN 201910297630A CN 110018393 A CN110018393 A CN 110018393A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/005—Circuits arrangements for indicating a predetermined temperature
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The invention discloses a kind of detection of XLPE cable connector abnormal heating and assessment methods, it include: 1) to build XLPE cable connector abnormal heating detection device, using the XLPE cable splice insulation layer temperature data for 8 temperature sensors monitoring that single chip control module treatment temperature signal acquiring system acquires, the circulation of liquid nitrogen and the work of alarm device are controlled；2) XLPE cable connector abnormal heating situation is tested；3) it tests and assesses to XLPE cable connector abnormal heating degree, the temperature data of 8 temperature sensors in the XLPE cable connector abnormal heating 1min time stored using temperature signal collection system calculates XLPE cable conductor joint heating damage factor.This method can detecte the abnormal heating situation of XLPE cable connector, and can be accurately judged to the fever degree of injury of the XLPE cable connector when XLPE cable connector abnormal heating can not be effectively reduced.
Description
Technical field
The invention belongs to electrical system cable and junction malfunction fields, and in particular to a kind of XLPE cable connector abnormal heating inspection
Survey and assessment method.
Background technique
In recent years, with the rapid development of China's power transmission engineering, XLPE cable is because of its superior mechanical and its insulation performance
It is widely used；XLPE cable connector is used for the connection of XLPE cable ontology and ontology, is Frequent Troubles in cable system
Main Weak Links generate abnormal heating phenomenon, for a long time usually because there are the influences of some failures or external environment inside it
Operation easily leads to internal weak part deterioration, causes shelf depreciation breakdown, causes exploding and firing accident, seriously endangers transmission line of electricity
Operation, influences effective use of electric power.Therefore effective temperature detection is carried out to XLPE cable connector, and can be according to its temperature number
According to the assessment of abnormal heating degree is carried out, it is of great significance.
There are many electrical problems for XLPE cable connector, are the significant bottlenecks of power transmission engineering development, and its inside is different
Normal heating problem is one of most important problem, mainly passes through surface for the temperature detection method of XLPE cable connector at present
Setting temperature sensor is detected, and surface temperature not can accurately reflect its internal fever vulnerable to ambient temperature effect
Situation, so, it is badly in need of a kind of profiling temperatures that can accurately detect inside XLPE cable connector, and can be according to its temperature number
According to the method for carrying out effective failure assessment, this is of great significance to the development of cable system and power transmission engineering.
Summary of the invention
The object of the present invention is to provide a kind of detection of XLPE cable connector abnormal heating and assessment methods.
Realize that the technical solution of the object of the invention is as follows:
A kind of detection of XLPE cable connector abnormal heating and assessment method, feature include the following steps:
The first step builds XLPE cable connector abnormal heating detection device
The XLPE cable connector abnormal heating detection device includes adjustable outlet (2), the left end sensor outlet in left end
(3), temperature control shell (4), right end sensor outlet (7), right end is adjustable outlet (8), No. 1 temperature sensor (10), No. 2 temperature sensing
Device (11), No. 3 temperature sensors (12), No. 4 temperature sensors (13), No. 5 temperature sensors (15), No. 6 temperature sensors
(16), No. 7 temperature sensors (17), No. 8 temperature sensors (18), nitrogen storage tank (19), liquid nitrogen imported valve (20), liquid nitrogen
Outlet valve (21), abnormal heating detection module (25), liquid nitrogen export diversion pipe (29), built-in liquid nitrogen diversion pipe (30), liquid nitrogen
Import diversion pipe (31), No. 1 output line (32), No. 2 output lines (33)；
Left end adjustable outlet (2) and right end adjustable outlet (8) of the left end cable connector (1) across temperature control shell (4) first；So
Rear left end cable connector (1) and right end cable connector (9) pass through cable intermediate joint device (14) and connect into cable connector；Finally
Temperature control shell (4) is moved to cable intermediate joint device (14), is located at cable intermediate joint device (14) in temperature control shell (4)
Heart position is fixed on cable connector in temperature control shell (4) by adjusting the adjustable outlet (2) in left end and the adjustable outlet (8) of right end；
The abnormal heating detection module (25) is by triggering indicator light (22), DC power supply (23), relay (24), report
Alert device (26), single chip control module (27), temperature signal collection system (28) composition；
Liquid nitrogen is transmitted to liquid nitrogen outlet diversion pipe (29), liquid nitrogen by liquid nitrogen outlet valve (21) by nitrogen storage tank (19)
The left end that outlet diversion pipe (29) passes through temperature control shell (4) is connected to built-in liquid nitrogen diversion pipe (30), built-in liquid nitrogen diversion pipe (30)
Spiral is fixed on temperature control shell (4) inner wall, and the right end that built-in liquid nitrogen diversion pipe (30) passes through temperature control shell (4) exports liquid nitrogen to liquid nitrogen
Liquid nitrogen is back to nitrogen storage tank by liquid nitrogen imported valve (20) by import diversion pipe (31), liquid nitrogen import diversion pipe (31)
(19)；
No. 1 temperature sensor (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), No. 4 temperature sensors
(13) upper and lower sides are staggered and are uniformly placed in left end cable connector insulating layer (5) surface, parallel output to No. 1 output line (32), and No. 1
Output line (32) is connected to temperature signal collection system (28) by left end sensor outlet (3)；No. 5 temperature sensors (15), 6
Number temperature sensor (16), No. 7 temperature sensors (17), No. 8 temperature sensor (18) upper and lower sides, which are staggered, is uniformly placed in right end
Cable connector insulating layer (6) surface, parallel output to No. 2 output lines (33), No. 2 output lines (33) pass through right end sensor outlet
(7) temperature signal collection system (28) are connected to；Temperature signal collection system (28) is connected to single chip control module (27), single
Piece machine control module (27) transmits signal to relay (24) and alarm (26), controls relay (24) and alarm (26) work
Make, relay (24) one end is connected to DC power supply (23), and DC power supply (23) is connected to triggering indicator light (22), is connected to touching
Hair indicator light (22) is connected to the liquid nitrogen outlet valve (21) in nitrogen storage tank (19), and liquid nitrogen outlet valve (21) is connected to liquid
Nitrogen inlet valve (20), liquid nitrogen imported valve (20) connect back to relay (24)；
Step 2: test XLPE cable connector abnormal heating situation:
2.1 No. 1 temperature sensors (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), No. 4 temperature sensing
Device (13) tests left end cable connector insulating layer (5) temperature, No. 5 temperature sensors (15), No. 6 temperature sensors every 2s
(16), No. 7 temperature sensors (17), No. 8 temperature sensors (18) test right end cable connector insulating layer (6) temperature every 2s,
Temperature signal collection system (28) temperature collection signal, and stored；Single chip control module (27) is adopted according to temperature signal
The temperature information of collecting system (28) acquisition transmits signal to relay (24) and alarm device (26)；
The work step of 2.2 wherein single chip control modules (27) includes: that single chip control module (27) read temperature letter
The left end cable connector insulating layer (5) of number acquisition system (28) acquisition and the temperature of right end cable connector insulating layer (6), are sentenced
It is disconnected；
2.2.1 if at any time, the temperature value of 8 temperature sensors test is all less than threshold value T, then single-chip microcontroller control
Molding block (27) persistently exports low level and keeps disconnected to relay (24) and alarm device (26), relay (24) and alarm device (26)
Open state；
2.2.2 if at any time, any value is more than threshold value T in the temperature value of 8 temperature sensors test, and is kept
More than 1min, then single chip control module (27) exports high level signal to relay (24), relay (24) working condition from
Conversion is disconnected to conduction mode, circuit conducting, DC power supply (23) to triggering indicator light (22) and liquid nitrogen imported valve (20) and
Liquid nitrogen outlet valve (21) power supply, triggering indicator light (22) are lighted, and liquid nitrogen imported valve (20) and liquid nitrogen outlet valve (21) are beaten
It opens, liquid nitrogen is exported from liquid nitrogen outlet valve (21) to liquid nitrogen and exports diversion pipe (29) by nitrogen storage tank (19), and liquid nitrogen flows through interior
Liquid nitrogen diversion pipe (30) and liquid nitrogen import diversion pipe (31) are set, is back to nitrogen storage tank by liquid nitrogen imported valve (20)
(19)；Temperature signal collection system (28) continuous collecting temperature signal, and single chip control module (27) are transmitted to, when 8 temperature
When angle value is all less than threshold value T, then single chip control module (27) exports low level signal to relay (24), relay (24)
It disconnects, DC power supply (23) stops power supply；
If the high level signal duration that 2.2.3 single chip control module (27) is persistently sent to relay (24) reaches
2min, then single chip control module (27) stops sending high level signal, starts to send low level signal to relay (24), after
Electric appliance (24) disconnects, and DC power supply (23) stops power supply, and starts to send high level signal to alarm device (26), triggers alarm device
(26) it works, shows that XLPE cable connector abnormal heating detection device can not carry out at abnormal heating XLPE cable connector
Reason, needs to continue the assessment of third step XLPE cable connector abnormal heating degree；
Step 3: testing and assessing to XLPE cable connector abnormal heating degree:
1min of the temperature since being more than threshold value T before the starting of 3.1 Extracting temperature signal acquiring systems (28) record cools down
The data that the temperature that 8 temperature sensors of 31 times interior tests are tested changes over time, are denoted as (i, yi,j), i indicates the
I test, i are integer, and i ∈ [1,31], j indicate j-th of sensor, and j is integer, j ∈ [1,8]；That is the 1st test data note
It is (1, y1,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as first group of time-temperature response sequence；2nd test
Data are denoted as (2, y2,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as second group of time-temperature response sequence；3rd
Secondary test data is denoted as (3, y3,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, and referred to as third group time-temperature responds sequence
Column；The 4th test data is denoted as (4, y4,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as the 4th group of time-temperature
Response sequence；The 5th test data is denoted as (5, y5,j), j is integer, j ∈ [1,8], 8 groups of data is obtained, at referred to as the 5th group
M- temperature-responsive sequence；6th time test data is denoted as (6, y6,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as
Six groups of time-temperature response sequences；Similar, the 30th time test data is denoted as (30, y30,j), j is integer, and j ∈ [1,8] obtains 8
Group data, referred to as the 30th group of time-temperature response sequence；31st time test data is denoted as (31, y31,j), j is integer, j ∈
[1,8] obtains 8 groups of data, referred to as the 31st group of time-temperature response sequence；
3.2, which calculate every group of time-temperature response sequence, deviates accounting factor pi:
ΔDiIt is expressed as the average departure index of temperature departure threshold value T in every group of time-temperature response sequence, i is integer,
i∈[1,31]；ΔD(i,max)It is expressed as the maximum deviation index of temperature departure threshold value T in every group of time-temperature response sequence, i
For integer, i ∈ [1,31]；ΔD(i,min)The minimum of temperature departure threshold value T in every group of time-temperature response sequence is expressed as to deviate
Index, i are integer, i ∈ [1,31]；yi,jIt is the temperature test value of the jth temperature sensor of i-th test, j is integer, j ∈
[1,8], i are integer, i ∈ [1,31]；
3.3 calculate the total coefficient of deviation μ of temperature in 31 groups of time-temperature response sequences:
Wherein,Indicate that the temperature averages of i-th group of time-temperature response sequence, i are integer, i ∈ [1,31]；Table
Show the total moisture content average value of 31 groups of time-temperature response sequences；
3.4 calculate XLPE cable conductor joint heating damage factor θ:
Wherein,It indicates in corresponding 31 temperature averages of 31 groups of time-temperature response sequencesIn, the b contained is a
More than or equal to total moisture content average valueTemperature averages, a be this b temperature averages in a-th of temperature averages；paTable
Show the corresponding deviation accounting factor of this group of time-temperature response sequence, a is integer, and b is integer, a ∈ [1, b]；α is indicated 31
It is more than or equal to total moisture content average value in a temperature averagesB temperature averages average increment value；It indicates at 31 groups
Corresponding 31 temperature averages of time-temperature response sequenceIn, q contained are less than total moisture content average valueTemperature it is flat
Mean value, l are first of temperature averages in this q temperature averages；plIndicate that this group of time-temperature response sequence is corresponding
Deviate the accounting factor, l is integer, and q is integer, l ∈ [1, q]；B+q=31；β indicates to be less than total temperature in 31 temperature averages
Spend average valueQ temperature averages average increment value；
3.5 judge the abnormal heating degree of XLPE cable connector, compare the threshold value w of fever damage factor θ and setting1:
If generating heat damage factor θ≤w1, then the abnormal heating situation of XLPE cable connector is relatively slight；
If generating heat damage factor θ > w1, show that the damage of XLPE cable connector is serious.
The beneficial effects of the present invention are:
(1) XLPE cable connector abnormal heating detection device of the invention passes through the temperature inside 8 sensors detections, and
Liquid nitrogen can be used effectively to control the raising of temperature；
(2) temperature information that abnormal heating assessment method of the invention can be stored according to abnormal heating detection device, meter
XLPE cable conductor joint heating damage factor is calculated, more precisely judges the abnormal heating situation of XLPE cable connector.
Detailed description of the invention
The structure chart of Fig. 1 XLPE cable connector abnormal heating detection device.
The dimensional drawing of Fig. 2 temperature control shell and interior arrangement.
The flow chart of Fig. 3 XLPE cable connector abnormal heating assessment method.
Specific embodiment
The present invention is further illustrated below.
A kind of detection of XLPE cable connector abnormal heating and assessment method, include the following steps:
The first step builds XLPE cable connector abnormal heating detection device, and structure chart is as shown in Figure 1:
XLPE cable connector abnormal heating detection device includes the adjustable outlet (2) in left end, left end sensor outlet (3), temperature
Control shell (4), right end sensor outlet (7), right end is adjustable outlet (8), No. 1 temperature sensor (10), No. 2 temperature sensors
(11), No. 3 temperature sensors (12), No. 4 temperature sensors (13), No. 5 temperature sensors (15), No. 6 temperature sensors (16),
No. 7 temperature sensors (17), No. 8 temperature sensors (18), nitrogen storage tank (19), liquid nitrogen imported valve (20), liquid nitrogen outlet
Valve (21), abnormal heating detection module (25), liquid nitrogen export diversion pipe (29), built-in liquid nitrogen diversion pipe (30), liquid nitrogen import
Diversion pipe (31), No. 1 output line (32), No. 2 output lines (33)；
Left end adjustable outlet (2) and right end adjustable outlet (8) of the left end cable connector (1) across temperature control shell (4) first；So
Rear left end cable connector (1) and right end cable connector (9) pass through cable intermediate joint device (14) and connect into cable connector；Finally
Temperature control shell (4) is moved to cable intermediate joint device (14), is located at cable intermediate joint device (14) in temperature control shell (4)
Heart position is fixed on cable connector in temperature control shell (4) by adjusting the adjustable outlet (2) in left end and the adjustable outlet (8) of right end；
The abnormal heating detection module (25) is by triggering indicator light (22), DC power supply (23), relay (24), report
Alert device (26), single chip control module (27), temperature signal collection system (28) composition；
Liquid nitrogen is transmitted to liquid nitrogen outlet diversion pipe (29), liquid nitrogen by liquid nitrogen outlet valve (21) by nitrogen storage tank (19)
The left end that outlet diversion pipe (29) passes through temperature control shell (4) is connected to built-in liquid nitrogen diversion pipe (30), built-in liquid nitrogen diversion pipe (30)
Spiral is fixed on temperature control shell (4) inner wall, and the right end that built-in liquid nitrogen diversion pipe (30) passes through temperature control shell (4) exports liquid nitrogen to liquid nitrogen
Liquid nitrogen is back to nitrogen storage tank by liquid nitrogen imported valve (20) by import diversion pipe (31), liquid nitrogen import diversion pipe (31)
(19)；
No. 1 temperature sensor (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), No. 4 temperature sensors
(13) upper and lower sides are staggered and are uniformly placed in left end cable connector insulating layer (5) surface, parallel output to No. 1 output line (32), and No. 1
Output line (32) is connected to temperature signal collection system (28) by left end sensor outlet (3)；No. 5 temperature sensors (15), 6
Number temperature sensor (16), No. 7 temperature sensors (17), No. 8 temperature sensor (18) upper and lower sides, which are staggered, is uniformly placed in right end
Cable connector insulating layer (6) surface, parallel output to No. 2 output lines (33), No. 2 output lines (33) pass through right end sensor outlet
(7) temperature signal collection system (28) are connected to；Temperature signal collection system (28) is connected to single chip control module (27), single
Piece machine control module (27) transmits signal to relay (24) and alarm (26), controls relay (24) and alarm (26) work
Make, relay (24) one end is connected to DC power supply (23), and DC power supply (23) is connected to triggering indicator light (22), is connected to touching
Hair indicator light (22) is connected to the liquid nitrogen outlet valve (21) in nitrogen storage tank (19), and liquid nitrogen outlet valve (21) is connected to liquid
Nitrogen inlet valve (20), liquid nitrogen imported valve (20) connect back to relay (24)；
The dimensional drawing of Fig. 2 temperature control shell and interior arrangement, temperature control shell (4) overall length 800mm, left and right side faucal diameter are
230mm, middle casing diameter are 330mm, and faucal length is 150mm；Outlet (2) that left end is adjustable, right end is adjustable, and outlet (8) is variable
Diameter range is 20mm~150mm, and left end sensor outlet (3), right end sensor outlet (7) diameter are 10mm；Liquid nitrogen goes out
Mouth diversion pipe (29), built-in liquid nitrogen diversion pipe (30), liquid nitrogen import diversion pipe (31) diameter are 20mm, and spiral is fixed on temperature control shell
(4) lead of screw of the built-in liquid nitrogen diversion pipe (30) of inner wall is 80mm；Temperature sensor upper and lower sides, which are staggered, to be placed in cable and connects
In head insulating layer, the distance of the two neighboring temperature sensor in the same side is 150mm, not ipsilateral two neighboring temperature sensor away from
From for 75mm.
Step 2: test XLPE cable connector abnormal heating situation:
2.1 No. 1 temperature sensors (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), No. 4 temperature sensing
Device (13) tests left end cable connector insulating layer (5) temperature, No. 5 temperature sensors (15), No. 6 temperature sensors every 2s
(16), No. 7 temperature sensors (17), No. 8 temperature sensors (18) test right end cable connector insulating layer (6) temperature every 2s,
Temperature signal collection system (28) temperature collection signal, and stored；Single chip control module (27) is adopted according to temperature signal
The temperature information of collecting system (28) acquisition transmits signal to relay (24) and alarm device (26)；
The work step of 2.2 wherein single chip control modules (27) includes: that single chip control module (27) read temperature letter
The left end cable connector insulating layer (5) of number acquisition system (28) acquisition and the temperature of right end cable connector insulating layer (6), are sentenced
It is disconnected；
2.2.1 if at any time, the temperature value of 8 temperature sensors test is all less than threshold value T, then single-chip microcontroller control
Molding block (27) persistently exports low level and keeps disconnected to relay (24) and alarm device (26), relay (24) and alarm device (26)
Open state；
2.2.2 if at any time, any value is more than threshold value T in the temperature value of 8 temperature sensors test, and is kept
More than 1min, then single chip control module (27) exports high level signal to relay (24), relay (24) working condition from
Conversion is disconnected to conduction mode, circuit conducting, DC power supply (23) to triggering indicator light (22) and liquid nitrogen imported valve (20) and
Liquid nitrogen outlet valve (21) power supply, triggering indicator light (22) are lighted, and liquid nitrogen imported valve (20) and liquid nitrogen outlet valve (21) are beaten
It opens, liquid nitrogen is exported from liquid nitrogen outlet valve (21) to liquid nitrogen and exports diversion pipe (29) by nitrogen storage tank (19), and liquid nitrogen flows through interior
Liquid nitrogen diversion pipe (30) and liquid nitrogen import diversion pipe (31) are set, is back to nitrogen storage tank by liquid nitrogen imported valve (20)
(19)；Temperature signal collection system (28) continuous collecting temperature signal, and single chip control module (27) are transmitted to, when 8 temperature
When angle value is all less than threshold value T, then single chip control module (27) exports low level signal to relay (24), relay (24)
It disconnects, DC power supply (23) stops power supply；
If the high level signal duration that 2.2.3 single chip control module (27) is persistently sent to relay (24) reaches
2min, then single chip control module (27) stops sending high level signal, starts to send low level signal to relay (24), after
Electric appliance (24) disconnects, and DC power supply (23) stops power supply, and starts to send high level signal to alarm device (26), triggers alarm device
(26) it works, shows that XLPE cable connector abnormal heating detection device can not carry out at abnormal heating XLPE cable connector
Reason, needs to continue the assessment of third step XLPE cable connector abnormal heating degree；
Step 3: testing and assessing to XLPE cable connector abnormal heating degree, flow chart is as shown in Figure 3:
1min of the temperature since being more than threshold value T before the starting of 3.1 Extracting temperature signal acquiring systems (28) record cools down
The data that the temperature that 8 temperature sensors of 31 times interior tests are tested changes over time, are denoted as (i, yi,j), i indicates the
I test, i are integer, and i ∈ [1,31], j indicate j-th of sensor, and j is integer, j ∈ [1,8]；That is the 1st test data note
It is (1, y1,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as first group of time-temperature response sequence；2nd test
Data are denoted as (2, y2,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as second group of time-temperature response sequence；3rd
Secondary test data is denoted as (3, y3,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, and referred to as third group time-temperature responds sequence
Column；The 4th test data is denoted as (4, y4,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as the 4th group of time-temperature
Response sequence；The 5th test data is denoted as (5, y5,j), j is integer, j ∈ [1,8], 8 groups of data is obtained, at referred to as the 5th group
M- temperature-responsive sequence；6th time test data is denoted as (6, y6,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as
Six groups of time-temperature response sequences；Similar, the 30th time test data is denoted as (30, y30,j), j is integer, and j ∈ [1,8] obtains 8
Group data, referred to as the 30th group of time-temperature response sequence；31st time test data is denoted as (31, y31,j), j is integer, j ∈
[1,8] obtains 8 groups of data, referred to as the 31st group of time-temperature response sequence；
3.2, which calculate every group of time-temperature response sequence, deviates accounting factor pi:
ΔDiIt is expressed as the average departure index of temperature departure threshold value T in every group of time-temperature response sequence, i is integer,
i∈[1,31]；ΔD(i,max)It is expressed as the maximum deviation index of temperature departure threshold value T in every group of time-temperature response sequence, i
For integer, i ∈ [1,31]；ΔD(i,min)The minimum of temperature departure threshold value T in every group of time-temperature response sequence is expressed as to deviate
Index, i are integer, i ∈ [1,31]；yi,jIt is the temperature test value of the jth temperature sensor of i-th test, j is integer, j ∈
[1,8], i are integer, i ∈ [1,31]；
3.3 calculate the total coefficient of deviation μ of temperature in 31 groups of time-temperature response sequences:
Wherein,Indicate that the temperature averages of i-th group of time-temperature response sequence, i are integer, i ∈ [1,31]；Table
Show the total moisture content average value of 31 groups of time-temperature response sequences；
3.4 calculate XLPE cable conductor joint heating damage factor θ:
Wherein,It indicates in corresponding 31 temperature averages of 31 groups of time-temperature response sequencesIn, the b contained is a
More than or equal to total moisture content average valueTemperature averages, a be this b temperature averages in a-th of temperature averages；paTable
Show the corresponding deviation accounting factor of this group of time-temperature response sequence, a is integer, and b is integer, a ∈ [1, b]；α is indicated 31
It is more than or equal to total moisture content average value in a temperature averagesB temperature averages average increment value；It indicates at 31 groups
Corresponding 31 temperature averages of time-temperature response sequenceIn, q contained are less than total moisture content average valueTemperature it is flat
Mean value, l are first of temperature averages in this q temperature averages；plIndicate that this group of time-temperature response sequence is corresponding
Deviate the accounting factor, l is integer, and q is integer, l ∈ [1, q]；B+q=31；β indicates to be less than total temperature in 31 temperature averages
Spend average valueQ temperature averages average increment value；
3.5 judge the abnormal heating degree of XLPE cable connector, compare the threshold value w of fever damage factor θ and setting1,
Middle w1=1.5:
If generating heat damage factor θ≤w1, then the abnormal heating situation of XLPE cable connector is relatively slight；
If generating heat damage factor θ > w1, show that the damage of XLPE cable connector is serious.
Claims (1)
1. a kind of XLPE cable connector abnormal heating detection and assessment method, which comprises the steps of:
Step 1: building XLPE cable connector abnormal heating detection device
The XLPE cable connector abnormal heating detection device include the adjustable outlet (2) in left end, left end sensor outlet (3),
Temperature control shell (4), right end sensor outlet (7), right end is adjustable outlet (8), No. 1 temperature sensor (10), No. 2 temperature sensors
(11), No. 3 temperature sensors (12), No. 4 temperature sensors (13), No. 5 temperature sensors (15), No. 6 temperature sensors (16),
No. 7 temperature sensors (17), No. 8 temperature sensors (18), nitrogen storage tank (19), liquid nitrogen imported valve (20), liquid nitrogen outlet
Valve (21), abnormal heating detection module (25), liquid nitrogen export diversion pipe (29), built-in liquid nitrogen diversion pipe (30), liquid nitrogen import
Diversion pipe (31), No. 1 output line (32), No. 2 output lines (33)；
The abnormal heating detection module (25) is by triggering indicator light (22), DC power supply (23), relay (24), alarm
(26), single chip control module (27), temperature signal collection system (28) composition；
Liquid nitrogen is transmitted to liquid nitrogen outlet diversion pipe (29), liquid nitrogen outlet by liquid nitrogen outlet valve (21) by nitrogen storage tank (19)
The left end that diversion pipe (29) passes through temperature control shell (4) is connected to built-in liquid nitrogen diversion pipe (30), built-in liquid nitrogen diversion pipe (30) spiral
It is fixed on temperature control shell (4) inner wall, the right end that built-in liquid nitrogen diversion pipe (30) passes through temperature control shell (4) exports liquid nitrogen to liquid nitrogen import
Liquid nitrogen is back to nitrogen storage tank (19) by liquid nitrogen imported valve (20) by diversion pipe (31), liquid nitrogen import diversion pipe (31)；
No. 1 temperature sensor (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), on No. 4 temperature sensors (13)
Downside, which is staggered, is uniformly placed in left end cable connector insulating layer (5) surface, parallel output to No. 1 output line (32), No. 1 output line
(32) temperature signal collection system (28) are connected to by left end sensor outlet (3)；No. 5 temperature sensors (15), No. 6 temperature
Sensor (16), No. 7 temperature sensors (17), No. 8 temperature sensor (18) upper and lower sides, which are staggered, to be uniformly placed in right end cable and connects
Head insulating layer (6) surface, parallel output to No. 2 output lines (33), No. 2 output lines (33) are connected by right end sensor outlet (7)
It is connected to temperature signal collection system (28)；Temperature signal collection system (28) is connected to single chip control module (27), single-chip microcontroller
Control module (27) transmits signal to relay (24) and alarm (26), control relay (24) and alarm (26) and works,
Relay (24) one end is connected to DC power supply (23), and DC power supply (23) is connected to triggering indicator light (22), is connected to triggering
Indicator light (22) is connected to the liquid nitrogen outlet valve (21) in nitrogen storage tank (19), and liquid nitrogen outlet valve (21) is connected to liquid nitrogen
Imported valve (20), liquid nitrogen imported valve (20) connect back to relay (24)；
Step 2: test XLPE cable connector abnormal heating situation:
2.1 No. 1 temperature sensors (10), No. 2 temperature sensors (11), No. 3 temperature sensors (12), No. 4 temperature sensors
(13) left end cable connector insulating layer (5) temperature, No. 5 temperature sensors (15), No. 6 temperature sensors (16), 7 are tested every 2s
Number temperature sensor (17), No. 8 temperature sensors (18) test right end cable connector insulating layer (6) temperature, temperature letter every 2s
Number acquisition system (28) temperature collection signal, and stored；Single chip control module (27) is according to temperature signal collection system
(28) temperature information acquired transmits signal to relay (24) and alarm device (26)；
The work step of 2.2 wherein single chip control modules (27) includes: that single chip control module (27) are read temperature signal and adopted
The left end cable connector insulating layer (5) of collecting system (28) acquisition and the temperature of right end cable connector insulating layer (6), are judged；
2.2.1 if at any time, the temperature value of 8 temperature sensors test is all less than threshold value T, then single-chip microcontroller controls mould
Block (27) persistently exports low level and remains open shape to relay (24) and alarm device (26), relay (24) and alarm device (26)
State；
2.2.2 if at any time, any value is more than threshold value T in the temperature value of 8 temperature sensors test, and is remained above
1min, then single chip control module (27) exports high level signal to relay (24), and relay (24) working condition is from disconnection
Conversion is to conduction mode, and circuit conducting, DC power supply (23) is to triggering indicator light (22) and liquid nitrogen imported valve (20) and liquid nitrogen
Outlet valve (21) power supply, triggering indicator light (22) are lighted, and liquid nitrogen imported valve (20) and liquid nitrogen outlet valve (21) are opened, liquid
Liquid nitrogen is exported from liquid nitrogen outlet valve (21) to liquid nitrogen and exports diversion pipe (29) by nitrogen holding vessel (19), and liquid nitrogen flows through built-in liquid nitrogen
Diversion pipe (30) and liquid nitrogen import diversion pipe (31) are back to nitrogen storage tank (19) by liquid nitrogen imported valve (20)；Temperature
Signal acquiring system (28) continuous collecting temperature signal, and single chip control module (27) are transmitted to, when 8 temperature values all do not surpass
When crossing threshold value T, then single chip control module (27) exports low level signal to relay (24), and relay (24) disconnects, direct current
Power supply (23) stops power supply；
If the high level signal duration that 2.2.3 single chip control module (27) is persistently sent to relay (24) reaches 2min,
Single chip control module (27) stops sending high level signal, starts to send low level signal to relay (24), relay
(24) it disconnects, DC power supply (23) stops power supply, and starts to send high level signal to alarm device (26), triggers alarm device (26)
Work shows that XLPE cable connector abnormal heating detection device can not carry out abnormal heating processing to XLPE cable connector, needs
Continue the assessment of third step XLPE cable connector abnormal heating degree；
Step 3: testing and assessing to XLPE cable connector abnormal heating degree:
Since temperature in the 1min being more than threshold value T before the starting of 3.1 Extracting temperature signal acquiring systems (28) record cools down
The data that the temperature that 8 temperature sensors of 31 tests are tested changes over time, are denoted as (i, yi,j), i indicates i-th
Test, i are integer, and i ∈ [1,31], j indicate j-th of sensor, and j is integer, j ∈ [1,8]；I.e. the 1st test data is denoted as
(1,y1,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as first group of time-temperature response sequence；2nd test number
According to being denoted as (2, y2,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as second group of time-temperature response sequence；3rd time
Test data is denoted as (3, y3,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as third group time-temperature response sequence；
The 4th test data is denoted as (4, y4,j), j is integer, and j ∈ [1,8] obtains 8 groups of data, referred to as the 4th group of time-temperature response
Sequence；The 5th test data is denoted as (5, y5,j), j is integer, j ∈ [1,8], obtain 8 groups of data, referred to as the 5th group when m- temperature
Spend response sequence；6th time test data is denoted as (6, y6,j), j is integer, j ∈ [1,8], 8 groups of data is obtained, at referred to as the 6th group
M- temperature-responsive sequence；Similar, the 30th time test data is denoted as (30, y30,j), j is integer, and j ∈ [1,8] obtains 8 groups of numbers
According to referred to as the 30th group of time-temperature response sequence；31st time test data is denoted as (31, y31,j), j is integer, j ∈ [1,
8], 8 groups of data, referred to as the 31st group of time-temperature response sequence are obtained；
3.2, which calculate every group of time-temperature response sequence, deviates accounting factor pi:
ΔDiIt is expressed as the average departure index of temperature departure threshold value T in every group of time-temperature response sequence, i is integer, i ∈
[1,31]；ΔD(i,max)It is expressed as the maximum deviation index of temperature departure threshold value T in every group of time-temperature response sequence, i is whole
Number, i ∈ [1,31]；ΔD(i,min)The minimum deviation for being expressed as temperature departure threshold value T in every group of time-temperature response sequence refers to
Number, i is integer, i ∈ [1,31]；yi,jIt is the temperature test value of the jth temperature sensor of i-th test, j is integer, j ∈ [1,
8], i is integer, i ∈ [1,31]；
3.3 calculate the total coefficient of deviation μ of temperature in 31 groups of time-temperature response sequences:
Wherein,Indicate that the temperature averages of i-th group of time-temperature response sequence, i are integer, i ∈ [1,31]；Indicate 31 groups
The total moisture content average value of time-temperature response sequence；
3.4 calculate XLPE cable conductor joint heating damage factor θ:
Wherein,It indicates in corresponding 31 temperature averages of 31 groups of time-temperature response sequencesIn, b contained are greater than
Equal to total moisture content average valueTemperature averages, a be this b temperature averages in a-th of temperature averages；paIndicating should
The corresponding deviation accounting factor of group time-temperature response sequence, a is integer, and b is integer, a ∈ [1, b]；α is indicated in 31 temperature
It spends and is more than or equal to total moisture content average value in average valueB temperature averages average increment value；It indicates m- at 31 groups
Corresponding 31 temperature averages of temperature-responsive sequenceIn, q contained are less than total moisture content average valueTemperature averages,
L is first of temperature averages in this q temperature averages；plIndicate that the corresponding deviation of this group of time-temperature response sequence accounts for
Specific factor, l are integer, and q is integer, l ∈ [1, q]；B+q=31；β indicates average less than total moisture content in 31 temperature averages
ValueQ temperature averages average increment value；
3.5 judge the abnormal heating degree of XLPE cable connector, compare the threshold value w of fever damage factor θ and setting1:
If generating heat damage factor θ≤w1, then the abnormal heating situation of XLPE cable connector is relatively slight；
If generating heat damage factor θ > w1, show that the damage of XLPE cable connector is serious.
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