CN209311574U - Fully automatic secondary insulating resistance of cable auxiliary test unit - Google Patents
Fully automatic secondary insulating resistance of cable auxiliary test unit Download PDFInfo
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- CN209311574U CN209311574U CN201821771729.9U CN201821771729U CN209311574U CN 209311574 U CN209311574 U CN 209311574U CN 201821771729 U CN201821771729 U CN 201821771729U CN 209311574 U CN209311574 U CN 209311574U
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Abstract
The utility model discloses a kind of fully automatic secondary insulating resistance of cable auxiliary test units, 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 that the visual edit test program to PLC programmable controller, the utility model are suitable for power supply field.
Description
Technical field
The utility model relates to technical field of power systems more particularly to a kind of fully automatic secondary insulating resistance of cable to assist
Test device.
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 it is qualified that resistance value is greater than the Europe 10M.
Conventional test methods are manually progress wiring adjustment, such as: 1 core to 2 cores, 1 core to 3 cores, 1 core to 4 cores etc.,
The insulation resistance between two cables core can only be tested every time, test connection of every adjustment is just needed to cable discharge, until
The megger test between all cables core is completed, the cable of 10 cores needs to adjust 45 test connections；For one
The secondary cable of substation's armamentarium is completed all test replacement connection times and is multiplied with permutation and combination method, worked
Amount is big, and consuming time is long, and staff is in a kind of state of mechanical replacement test connection for a long time, it is easy to arrange
Certain core cable is omitted during combination and causes that test item is imperfect, result has deviation, leads to cable insulation disfigurement discovery not
Major safety risks are buried in time, and frequently contact high-potting line increases electric shock risk during test.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of fully automatic secondary insulating resistance of cable subtests
Device, work efficiency is high, test result is accurate, safe and reliable.
The technical solution that the utility model solves above-mentioned technical problem is as follows: 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 surveys to the visual edit of PLC programmable controller
Try program；The output end of PLC programmable controller is respectively with multiple normally opened relays by being electrically connected, by PLC PLC technology
The on-off of device control normally opened relay；
Cable core accesses terminal by passing through electrical connection, cable core incoming end with the common end of corresponding normally opened relay respectively
The other end of son, 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 revealed fully automatic secondary insulating resistance of cable auxiliary test unit of the utility model, its advantages
It is: has many advantages, such as that work efficiency is high, test result is accurate, safe and reliable compared with conventional methods, one is only needed in real work
All cables core are accessed the device by secondary property, turned on the power switch after megameter starting can be completed between all cables core,
Cable core over the ground between megger test, all cable core high pressures of secondary cable can be disposably discharged after test, try
It is accurate to test result, testing efficiency is high.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific 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 are generally identified by similar appended drawing reference.In attached drawing, each element or part might not be according to actual ratios
It draws.
Fig. 1 is the structure top view of the utility model；
Fig. 2 is the electrical connection schematic diagram of the utility model；
Fig. 3 is the operation principle schematic diagram of the utility model；
Fig. 4 is the principles 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 solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
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 megaohm
The calibrating terminal L of the red test pencil access test connection terminal of table, the calibrating terminal E of black meter pen access test connection terminal,
It opens electronic type megameter and is modulated to test resistance mode, normally opened relay KM1, KM3, KM5 ... KM2n-1 are in normally opened shape
State；
The test of insulation resistance value between first cable core and the second cable core: by PLC control normally opened relay KM1 and
KM4 is closed, and electronic type megameter is connected, and carries out the insulation resistance value test between the first cable core and the second cable core, test
As a result 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 first
Whether the insulation resistance value between cable core and the second cable core is qualified；
It successively detects, or KM1 and KM6 is closed, the insulation resistance value carried out between the first cable core and third cable core is surveyed
Examination；Or be closed KM1 and KM8, carry out the insulation resistance value test between the first cable core and the 4th cable core；
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, when the resistance value of display is greater than or equal to setting value, that is, can determine whether second
Whether the insulation resistance value between cable 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 million
The display screen of Europe table is shown, 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
The calibrating terminal L of the red test pencil access test connection terminal of megameter, black meter pen connect earthing test terminal, open electronic type
Megameter modulation measurement resistance mode, PLC are respectively closed normally opened relay KM1, KM3, KM5 ... KM2n；Realize different cable cores with
Resistance value between ground, test result show that the resistance value of display is greater than or equal to setting by the display screen of electronic type megameter
When value, it is possible thereby to judge whether qualification.
As shown in Figs 1-4, the revealed a kind of fully automatic secondary insulating resistance of cable auxiliary test unit of the utility model,
Mainly for the insulation resistance value test between each cable core of secondary cable and between cable core and ground comprising cabinet 1, in
Portion is equipped with PLC programmable controller, multiple normally opened relays and power module, and display screen 2 is embedded on case panel, more
A cable core accesses terminal 3, two test connection terminals 4 and earthing test terminal 5, wherein the more cable cores and ground core of secondary cable
It is connect respectively with cable core access terminal 3, the ground line of secondary cable is connect with ground wire access terminal, between progress " core and core "
When test, two test pencils of electronic type megameter are inserted into respectively in two test connection terminals 4, are surveyed between progress " core and ground "
When examination, 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, the auxiliary test unit of the utility model, PLC programmable controller and the first normally opened relay
KM1, the second normally opened relay KM2, third normally opened relay KM3, the 4th normally opened relay KM4, the 5th normally opened relay KM5,
6th normally opened relay KM6, the 7th normally opened relay KM7, the 8th normally opened relay KM8, the 9th normally opened relay KM9, the tenth
Normally opened relay KM10, the 11st normally opened relay KM11, the 12nd normally opened relay KM12, the 13rd normally opened relay
KM13, the 14th normally opened relay KM14, the 15th normally opened relay KM15, the 16th normally opened relay KM16 are by being electrically connected
Connect, PLC programmable controller type selecting be S7-226CN, input terminal connect liquid crystal display, and its output end 0.1-0.7,
1.0-1.7 is separately connected normally opened relay KM1-KM16, realizes and controls the on-off of 16 normally opened relays, 8 cable core accesses
Terminal 3(cable connection column L1-L8) respectively with the first normally opened relay KM1 and the second common end normally opened relay KM2, third
The common end of normally opened relay KM3 and the 4th normally opened relay KM4, the 5th normally opened relay KM5 and the 6th normally opened relay KM6
Common end, the 7th normally opened relay KM7 and the 8th normally opened relay KM8 common end, the 9th normally opened relay KM9 and the tenth
The common end of normally opened relay KM10, the common end of the 11st normally opened relay KM11 and the 12nd normally opened relay KM12,
Common end, the 15th normally opened relay KM15 and the 16th of 13 normally opened relay KM13 and the 14th normally opened relay KM14
The common end of normally opened relay KM16 is corresponded through electrical connection, i.e. cable connection column L1 and normally opened relay KM1 and KM2
Common end is electrically connected, and 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 ...
The normally open end of KM15；The calibrating terminal E parallel connection for testing connection terminal 4 is electrically connected second normally opened relay KM2, KM4, KM6 ...
The normally open end of KM16；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
In binding post 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: by PLC control normally opened relay KM1 and
KM4 is closed, and electronic type megameter is connected, and carries out the insulation resistance value test between the first cable core and the second 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 first cable core and the second cable core
It is whether qualified；
It successively detects, or KM1 and KM6 is closed, the insulation resistance value carried out between the first cable core and third cable core is surveyed
Examination；Or be closed KM1 and KM8, carry out the insulation resistance value test between the first cable core and the 4th cable core.
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 connects
In terminal 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, open electronic type megameter modulation 1000V and persistently export and starts 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 various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (4)
1. fully automatic secondary insulating resistance of cable auxiliary test unit, it is characterised in that: including shell, inside PLC is installed
Programmable controller, normally opened relay control module and power module are embedded with display screen and connecting terminal on case panel,
In:
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. fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: the cable
LED light is serially connected between core access terminal and test connection terminal.
3. fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: the electricity
Source module includes double power supply converting switch, and one of input terminal connects alternating current, the connection of another input terminal by reduction voltage circuit
The output end of battery, power module connects PLC programmable controller.
4. fully automatic secondary insulating resistance of cable auxiliary test unit according to claim 1, it is characterised in that: the shell
Earthing test terminal is directly grounded on honorable plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821771729.9U CN209311574U (en) | 2018-10-30 | 2018-10-30 | Fully automatic secondary insulating resistance of cable auxiliary test unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821771729.9U CN209311574U (en) | 2018-10-30 | 2018-10-30 | Fully automatic secondary insulating resistance of cable auxiliary test unit |
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| CN209311574U true CN209311574U (en) | 2019-08-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444542A (en) * | 2018-10-30 | 2019-03-08 | 国网山西省电力公司晋城供电公司 | A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method |
| CN111308205A (en) * | 2019-12-03 | 2020-06-19 | 湖北江山重工有限责任公司 | General insulation resistance detection device |
| CN112540225A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Testing device and testing method for secondary loop insulation resistance |
-
2018
- 2018-10-30 CN CN201821771729.9U patent/CN209311574U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444542A (en) * | 2018-10-30 | 2019-03-08 | 国网山西省电力公司晋城供电公司 | A kind of fully automatic secondary insulating resistance of cable auxiliary test unit and its test method |
| CN111308205A (en) * | 2019-12-03 | 2020-06-19 | 湖北江山重工有限责任公司 | General insulation resistance detection device |
| CN112540225A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Testing device and testing method for secondary loop insulation resistance |
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