CN109444542A - A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method - Google Patents
A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method Download PDFInfo
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- CN109444542A CN109444542A CN201811278899.8A CN201811278899A CN109444542A CN 109444542 A CN109444542 A CN 109444542A CN 201811278899 A CN201811278899 A CN 201811278899A CN 109444542 A CN109444542 A CN 109444542A
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- 238000012360 testing method Methods 0.000 title claims abstract description 126
- 238000010998 test method Methods 0.000 title claims abstract description 10
- 230000000007 visual effect Effects 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 32
- 238000012797 qualification Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000012956 testing procedure Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 206010061619 Deformity Diseases 0.000 description 1
- 206010014357 Electric shock Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The invention discloses a kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test methods, including shell, PLC programmable controller is installed inside it, normally opened relay control module and power module, display screen is embedded on case panel, multiple cable core access terminals and two test connection terminals, the cable core access terminal is separately connected multi-cable core and ground core in secondary cable, test two test pencils of connection terminal connection electronic type megameter, and it is connected respectively by conducting wire between each cable core access terminal and two test connection terminals, power module connects PLC programmable controller, test device is powered；Normally opened relay control module includes that multiple normally opened relays are serially connected in respectively between cable core access terminal and test connection terminal, and control on-off by PLC programmable controller；Display screen connects the input terminal of PLC programmable controller, realizes the visual edit test program to PLC programmable controller.Auxiliary test unit of the present invention, work efficiency is high, test result is accurate, safe and reliable.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of fully automatic secondary insulating resistance of cable subtests
Device and its test method.
Background technique
For relay protection and Automation Specialty, the quality of secondary cable insulation performance directly affects secondary device
Stable operation, therefore the megger test of secondary cable is with regard to particularly important and crucial.According to related regulatory requirements, secondary electricity
Cable megger test is needed using 1000V megameter to the insulated electro between secondary cable core and core, between cable core and ground
Resistance is successively tested, and resistance value is greater than the Europe 10M qualification
Conventional test methods be manually progress wiring adjustment, such as: 1 core to 2 cores, 1 core to 3 cores, 1 core to 4 cores etc., every time
The insulation resistance between two cables core can only be tested, test connection of every adjustment is just needed to cable discharge, until completing
Megger test between all cables core, the cable of 10 cores need to adjust 45 test connections；For a power transformation
It stands the secondary cable of armamentarium, completes all tests and replace connection times to be multiplied with permutation and combination method, heavy workload,
Consuming time is long, and staff is in a kind of state of mechanical replacement test connection for a long time, it is easy in permutation and combination
During omit certain core cable and cause that test item is imperfect, result has deviation, lead to cable insulation disfigurement discovery not in time
Major safety risks are buried, frequently contact high-potting line increases electric shock risk during test.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of fully automatic secondary insulating resistance of cable auxiliary test unit,
Work efficiency is high, test result is accurate, safe and reliable.
The technical scheme to solve the above technical problems is that a kind of fully automatic secondary insulating resistance of cable auxiliary is surveyed
Trial assembly is set, including shell, inside PLC programmable controller, normally opened relay control module and power module, shell are installed
Display screen and connecting terminal are embedded on panel, in which:
Connecting terminal includes multiple cable core access terminal, two test connection terminals, earthing test terminals；
Power module connects PLC programmable controller, is powered to test device；
Display screen connects the input terminal of PLC programmable controller, realizes and tests journey to the visual edit of PLC programmable controller
Sequence；The output end of PLC programmable controller is respectively with multiple normally opened relays by being electrically connected, by PLC programmable controller control
The on-off of normally opened relay processed；
Cable core accesses terminal by the way that respectively with the common end of corresponding normally opened relay by electrical connection, cable core accesses terminal
The other end, which connects, is detected cable core；
One of test connection terminal parallel connection is electrically connected the normally open end of a part of corresponding normally opened relay；
Another test connection terminal parallel connection is electrically connected the normally open end of the corresponding normally opened relay of another part；
One end of earthing test terminal is grounded.
Further, LED light is serially connected between the cable core access terminal and test connection terminal.
Further, the power module includes double power supply converting switch, and one of input terminal is connected by reduction voltage circuit
Alternating current is connect, another input terminal connects battery, and the output end of power module connects PLC programmable controller.
Further, earthing test terminal is directly grounded on the case panel.
A kind of test method of fully automatic secondary insulating resistance of cable auxiliary test unit, including cable core and cable core it
Between resistance value testing procedure it is as follows:
Measured the first cable core to N cable core is sequentially ingressed into respectively in N number of cable core access terminal, by electronic type megameter
The calibrating terminal L of red test pencil access test connection terminal, the calibrating terminal E of black meter pen access test connection terminal, is opened
Electronic type megameter is modulated to test resistance mode, and normally opened relay KM1, KM3, KM5 ... KM2n-1 are in normally open；
The test of insulation resistance value between first cable core and the second cable core: normally opened relay KM1 and KM4 are controlled by PLC
It is closed, electronic type megameter is connected, and the insulation resistance value test between the first cable core and the second cable core, test result are carried out
It is shown by the display screen of electronic type megameter, when the resistance value of display is greater than or equal to setting value, that is, can determine whether the first cable
Whether the insulation resistance value between core and the second cable core is qualified；
It successively detects, or KM1 and KM6 is closed, carry out the insulation resistance value test between the first cable core and third cable core；Or
KM1 and KM8 is closed, the insulation resistance value test between the first cable core and the 4th cable core is carried out；
The test of insulation resistance value between second cable core and third cable core controls normally opened relay KM3 and KM6 by PLC
It is closed, electronic type megameter is connected, and the insulation resistance value test between the second cable core and third cable core, test result are carried out
It is shown by the display screen of electronic type megameter, when the resistance value of display is greater than or equal to setting value, that is, can determine whether the second cable
Whether the insulation resistance value between core and third cable core is qualified；
Referring to this above-mentioned steps, the insulation resistance value test between all cables core is realized, test result passes through electronic type megameter
Display screen show, when the resistance value of display is greater than or equal to setting value, it is possible thereby to judge whether qualification.
A kind of test method of fully automatic secondary insulating resistance of cable auxiliary test unit, including between cable core and ground
Resistance value test method is as follows:
Measured first cable core to N cable core is sequentially ingressed into respectively in N number of cable core access terminal, while by electronic type megaohm
The calibrating terminal L of the red test pencil access test connection terminal of table, black meter pen connect earthing test terminal, open electronic type megaohm
Table modulation measurement resistance mode, PLC are respectively closed normally opened relay KM1, KM3, KM5 ... KM2n；Realize different cable cores and ground
Between resistance value, test result show by the display screen of electronic type megameter, when the resistance value of display is more than or equal to setting value,
It is possible thereby to judge whether qualification.
A kind of disclosed fully automatic secondary insulating resistance of cable auxiliary test unit, the beneficial effect is that: compared with
Conventional methods have many advantages, such as that work efficiency is high, test result is accurate, safe and reliable, in real work only need to disposably by
All cables core access the device, after megameter starting after turn on the power switch can be completed between all cables core, cable core
Megger test between over the ground can disposably discharge all cable core high pressures of secondary cable, test result after test
Accurately, testing efficiency is high.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is structure top view of the invention；
Fig. 2 is electrical connection schematic diagram of the invention；
Fig. 3 is the working principle of the invention schematic diagram；
Fig. 4 is the principle of the present invention figure.
Appended drawing reference.
1- cabinet, 2- display screen, 3- cable core access terminal, and 4- tests connection terminal, 5- earthing test terminal.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.
As shown in Figs 1-4, disclosed a kind of fully automatic secondary insulating resistance of cable auxiliary test unit, mainly
For the insulation resistance value test between each cable core of secondary cable and between cable core and ground comprising cabinet 1, internal peace
Equipped with PLC programmable controller, multiple normally opened relays and power module are embedded with display screen 2, multiple cables on case panel
Core accesses terminal 3, two test connection terminals 4 and earthing test terminal 5, wherein more cable cores of secondary cable and ground core difference
It is connect with cable core access terminal 3, the ground line of secondary cable is connect with ground wire access terminal, is tested between progress " core and core "
When, two test pencils of electronic type megameter are inserted into respectively in two test connection terminals 4, are tested between progress " core and ground "
When, two test pencils of electronic type megameter are inserted into a test connection terminal 4 and earthing test terminal 5 respectively.
As in Fig. 2-3, multiple cable core access terminals are connect with two test connection terminals 4 by conducting wire respectively, and each
A relay and LED light are serially connected in connecting wire, normally opened relay controls on-off by PLC programmable controller, LED light
Light on and off then show whether the conducting wire is connected, earthing test terminal 5 by wired earth, by control on different routes it is normally opened after
Electric appliance on-off realizes the concatenation test between different cable cores.
The power module connects PLC programmable controller, is powered to test device.
The display screen is liquid crystal display, connects the input terminal of PLC programmable controller, is realized to PLC programmable control
The visual edit test program of device processed mainly realizes the on-off control between different normally opened relays.
In Fig. 3 and Fig. 4, auxiliary test unit of the invention, PLC programmable controller and the first normally opened relay KM1, the
Two normally opened relay KM2, third normally opened relay KM3, the 4th normally opened relay KM4, the 5th normally opened relay KM5, the 6th are often
Open relay KM6, the 7th normally opened relay KM7, the 8th normally opened relay KM8, the 9th normally opened relay KM9, the tenth it is normally opened after
Electric appliance KM10, the 11st normally opened relay KM11, the 12nd normally opened relay KM12, the 13rd normally opened relay KM13, the tenth
By electrical connection, PLC can by four normally opened relay KM14, the 15th normally opened relay KM15, the 16th normally opened relay KM16
Programmable controller type selecting is S7-226CN, and input terminal connects liquid crystal display, and its output end 0.1-0.7,1.0-1.7 distinguish
Normally opened relay KM1-KM16 is connected, realizes and the on-off of 16 normally opened relays is controlled, 8 cable core access terminal 3(cables connect
Terminal L1-L8) respectively with the first normally opened relay KM1 and the second common end normally opened relay KM2, third normally opened relay KM3
With the common end of the 4th normally opened relay KM4, the common end of the 5th normally opened relay KM5 and the 6th normally opened relay KM6, the 7th
The common end of normally opened relay KM7 and the 8th normally opened relay KM8, the 9th normally opened relay KM9 and the tenth normally opened relay
The common end of KM10, the common end of the 11st normally opened relay KM11 and the 12nd normally opened relay KM12, the 13rd it is normally opened after
The common end of electric appliance KM13 and the 14th normally opened relay KM14, the 15th normally opened relay KM15 and the 16th normally opened relay
The common end of KM16 is corresponded through electrical connection, i.e. the common end of cable connection column L1 and normally opened relay KM1 and KM2 are electrically connected
It connects, cable connection column L2 is electrically connected with the common end of normally opened relay KM3 and KM4 and so on；
Test connection terminal 4 calibrating terminal L parallel connection be electrically connected first normally opened relay KM1, KM3, KM5 ... KM15's
Normally open end；The calibrating terminal E parallel connection for testing connection terminal 4 is electrically connected second normally opened relay KM2, KM4, KM6 ... KM16's
Normally open end；One end of earthing test terminal 5 is grounded.
The power module includes two kinds of power-supplying forms, and one is alternating currents to access PLC by reduction voltage circuit, and another kind is electricity
Pond power supply, it is spare when as power-off, it is connected between two kinds of power-supplying forms by double power supply converting switch K, and carry out two kinds of confessions
The switching of electric form, reduction voltage circuit is conventional circuit, with specific reference to shown in Fig. 4.
Insulation resistance value testing procedure between core and core is as follows:
Measured the first cable core to the 8th cable core is sequentially ingressed into respectively in eight cable core access terminals 3, i.e. cable connection
In column L1-L8, the red test pencil of electronic type megameter is accessed into calibrating terminal L, black meter pen accesses calibrating terminal E,
It opens electronic type megameter modulation 1000V and persistently exports and start to carry out test resistance, normally opened relay KM1, KM3, KM5 ...
KM15 is in normally open；
The test of insulation resistance value between first cable core and the second cable core: normally opened relay KM1 and KM4 are controlled by PLC
It is closed, electronic type megameter is connected, and the insulation resistance value test between the first cable core and the second cable core, test result are carried out
Show can determine whether is insulation resistance value between the first cable core and the second cable core by the display screen of electronic type megameter
It is qualified；
It successively detects, or KM1 and KM6 is closed, carry out the insulation resistance value test between the first cable core and third cable core；Or
KM1 and KM8 is closed, the insulation resistance value test between the first cable core and the 4th cable core is carried out.
The test of insulation resistance value between second cable core and third cable core, by PLC control normally opened relay KM3 and
KM6 is closed, and electronic type megameter is connected, and carries out the insulation resistance value test between the second cable core and third cable core, test
As a result it is shown by the display screen of electronic type megameter, that is, can determine whether the insulation resistance value between the second cable core and third cable core
It is whether qualified.
So circulation realizes the insulation resistance value test between all cables core, and test result passes through the aobvious of electronic type megameter
Display screen is shown, it is possible thereby to judge qualified or not.
Test method between core and ground is as follows:
Measured first cable core to the 8th cable core is sequentially ingressed into respectively in eight cable core access terminals 3, i.e. cable connection column
In L1-L8, while the red test pencil of electronic type megameter is accessed into calibrating terminal L, black meter pen connects earthing test terminal 5, beats
Electronic type megameter modulation 1000V is opened persistently to export and start to be tested, PLC be respectively closed normally opened relay KM1, KM3,
KM5…KM16；Realize that the resistance value between different cable cores and ground, test result are shown by the display screen of electronic type megameter, by
This may determine that qualified or not.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (6)
1. a kind of fully automatic secondary insulating resistance of cable auxiliary test unit, it is characterised in that: including shell, inside be equipped with
PLC programmable controller, normally opened relay control module and power module are embedded with display screen and terminals on case panel
Son, in which:
Connecting terminal includes multiple cable core access terminal, two test connection terminals, earthing test terminals；
Power module connects PLC programmable controller, is powered to test device；
Display screen connects the input terminal of PLC programmable controller, realizes and tests journey to the visual edit of PLC programmable controller
Sequence；The output end of PLC programmable controller is respectively with multiple normally opened relays by being electrically connected, by PLC programmable controller control
The on-off of normally opened relay processed；
Cable core accesses terminal by the way that respectively with the common end of corresponding normally opened relay by electrical connection, cable core accesses terminal
The other end, which connects, is detected cable core；
One of test connection terminal parallel connection is electrically connected the normally open end of a part of corresponding normally opened relay；
Another test connection terminal parallel connection is electrically connected the normally open end of the corresponding normally opened relay of another part；
One end of earthing test terminal is grounded.
2. a kind of fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: institute
It states and is serially connected with LED light between cable core access terminal and test connection terminal.
3. a kind of fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: institute
Stating power module includes double power supply converting switch, and one of input terminal connects alternating current, another input terminal by reduction voltage circuit
Battery is connected, the output end of power module connects PLC programmable controller.
4. a kind of fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: institute
Earthing test terminal on case panel is stated to be directly grounded.
5. a kind of survey of fully automatic secondary insulating resistance of cable auxiliary test unit according to any one of claims 1-4
Method for testing, feature include that the resistance value testing procedure between cable core and cable core is as follows:
Measured the first cable core to N cable core is sequentially ingressed into respectively in N number of cable core access terminal, by electronic type megameter
The calibrating terminal L of red test pencil access test connection terminal, the calibrating terminal E of black meter pen access test connection terminal, is opened
Electronic type megameter is modulated to test resistance mode, and normally opened relay KM1, KM3, KM5 ... KM2n-1 are in normally open；
The test of insulation resistance value between first cable core and the second cable core: normally opened relay KM1 and KM4 are controlled by PLC
It is closed, electronic type megameter is connected, and the insulation resistance value test between the first cable core and the second cable core, test result are carried out
It is shown by the display screen of electronic type megameter, when the resistance value of display is greater than or equal to setting value, that is, can determine whether the first cable
Whether the insulation resistance value between core and the second cable core is qualified；
It successively detects, or KM1 and KM6 is closed, carry out the insulation resistance value test between the first cable core and third cable core；Or
KM1 and KM8 is closed, the insulation resistance value test between the first cable core and the 4th cable core is carried out；
The test of insulation resistance value between second cable core and third cable core controls normally opened relay KM3 and KM6 by PLC
It is closed, electronic type megameter is connected, and the insulation resistance value test between the second cable core and third cable core, test result are carried out
It is shown by the display screen of electronic type megameter, when the resistance value of display is greater than or equal to setting value, that is, can determine whether the second cable
Whether the insulation resistance value between core and third cable core is qualified；
Referring to this above-mentioned steps, the insulation resistance value test between all cables core is realized, test result passes through electronic type megameter
Display screen show, when the resistance value of display is greater than or equal to setting value, thus judge whether qualification.
6. a kind of survey of fully automatic secondary insulating resistance of cable auxiliary test unit according to any one of claims 1-4
Method for testing, feature include that the resistance value test method between cable core and ground is as follows:
Measured first cable core to N cable core is sequentially ingressed into respectively in N number of cable core access terminal, while by electronic type megaohm
The calibrating terminal L of the red test pencil access test connection terminal of table, black meter pen connect earthing test terminal, open electronic type megaohm
Table modulation measurement resistance mode, PLC are respectively closed normally opened relay KM1, KM3, KM5 ... KM2n；Realize different cable cores and ground
Between resistance value, test result show by the display screen of electronic type megameter, when the resistance value of display is more than or equal to setting value,
Thus judge whether qualification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278899.8A CN109444542A (en) | 2018-10-30 | 2018-10-30 | A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278899.8A CN109444542A (en) | 2018-10-30 | 2018-10-30 | A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method |
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| CN201811278899.8A Pending CN109444542A (en) | 2018-10-30 | 2018-10-30 | A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110658477A (en) * | 2019-09-02 | 2020-01-07 | 上海科梁信息工程股份有限公司 | Power supply test system of automobile |
| CN111948455A (en) * | 2020-07-03 | 2020-11-17 | 中广核核电运营有限公司 | Insulation resistance detection device and method of generator and generator |
| CN112462142A (en) * | 2020-11-13 | 2021-03-09 | 无锡中科电气设备有限公司 | Insulation resistance testing device |
| CN114019419A (en) * | 2021-10-29 | 2022-02-08 | 广西电网有限责任公司崇左供电局 | Insulation detection array type automatic combination device |
| CN116256543A (en) * | 2023-05-15 | 2023-06-13 | 广东电网有限责任公司佛山供电局 | System for shielding and measuring insulation resistance of 10kV cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658477A (en) * | 2019-09-02 | 2020-01-07 | 上海科梁信息工程股份有限公司 | Power supply test system of automobile |
| CN111948455A (en) * | 2020-07-03 | 2020-11-17 | 中广核核电运营有限公司 | Insulation resistance detection device and method of generator and generator |
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| CN114019419A (en) * | 2021-10-29 | 2022-02-08 | 广西电网有限责任公司崇左供电局 | Insulation detection array type automatic combination device |
| CN116256543A (en) * | 2023-05-15 | 2023-06-13 | 广东电网有限责任公司佛山供电局 | System for shielding and measuring insulation resistance of 10kV cable |
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