CN205229392U - Power cable insulating properties test system - Google Patents
Power cable insulating properties test system Download PDFInfo
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- CN205229392U CN205229392U CN201520987181.1U CN201520987181U CN205229392U CN 205229392 U CN205229392 U CN 205229392U CN 201520987181 U CN201520987181 U CN 201520987181U CN 205229392 U CN205229392 U CN 205229392U
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- power cable
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 abstract 2
- 238000010998 test method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model belongs to the technical field of power cable capability test, in particular to power cable insulating properties test system. Input and electric wire netting by electrical unit are connected, and the power input port of electrical unit's output and industrial computer, singlechip is connected, and display element's the input and the signal output part of singlechip connect, and control panel's output is connected with the signal input part of singlechip, the input of CAN communication unit and the connection of the PORT COM of singlechip, the output and the industrial computer connection of CAN communication unit, signal processing unit's input and insulating properties test circuit's signal output part connect, and signal processing unit output and AD translation unit's input is connected, and AD translation unit's the output and the signal input part of singlechip connect, and insulating properties test circuit's insulating properties 0 and insulating properties 1 connect. Can test power cable's insulating properties characteristic fast, test procedure simply, easily operates and is stable good.
Description
Technical field
The utility model belongs to power cable technical field of performance test, particularly a kind of power cable insulating property test macro.
Background technology
Power cable is aviation, medical treatment, the basic material that is most widely used in the field such as automobile and mine.Although power cable all can carry out the quality inspection of being correlated with before dispatching from the factory, but because user varies to the requirement of power cable function, often corresponding pre-service is carried out according to power cable heart yearn and function before using, as: dissimilar power cable connector is installed, anti-corrosion treatment etc.These pre-service all can change original electrical specification that power cable is established to a certain extent.Therefore, user, before carrying out the assembling of product electrical system, also must bonding properties require to detect some key characteristic of power cable, as: joint connection state, the parameters such as break-make performance and AC and DC dielectric voltage withstand.The checkout equipment of current use mostly is the equipment of simple function, and detection efficiency is very low, and data management is chaotic, also causes the waste of cost of labor and time cost simultaneously.For the problem of current driving force cable detection technology, development structure is simple, safe and reliable, and the integrated test system that can complete the functions such as break-make performance, resistance test, insulating property detection is the development trend of this technical field.
Summary of the invention
In order to solve the technical matters that prior art exists, the utility model proposes a kind of power cable insulating property test macro, object is accurately tested to realize insulating performance of cable, improves the quality of power cable, promotes the progress of cable detection technology.
The utility model is achieved through the following technical solutions utility model object:
Power cable insulating property test macro, be connected with electrical network by the input end of power supply unit, the output terminal of power supply unit is connected with the power input port of industrial computer, single-chip microcomputer, the input end of display unit is connected with the signal output part of single-chip microcomputer, the output terminal of control panel is connected with the signal input part of single-chip microcomputer, the input end of CAN communication unit is connected with the PORT COM of single-chip microcomputer, and the output terminal of CAN communication unit is connected with industrial computer; The input end of signal processing unit is connected with the signal output part of insulating property test circuit, the output terminal of signal processing unit is connected with the input end of AD conversion unit, the output terminal of AD conversion unit is connected with the signal input part of single-chip microcomputer, and the signals collecting end of insulating property test circuit is connected with power cable.
The described output terminal of CAN communication unit is connected with the serial communication interface of industrial computer.
Described insulating property test circuit adopts low-frequency ac signal injection method, tests power cable insulating property; Wherein the output terminal in low-frequency ac signal source is connected with one end of zero-sequence reactor, the other end of zero-sequence reactor is connected with the neutral point of three-phase reactor, three-phase reactor is connected with tested power cable, tested power cable passes through from current transformer punching, and the output terminal of current transformer is connected with the input end of the signal processing unit of test macro.
Described insulating property test circuit notes people's low-frequency ac signal voltage through the neutral point of three-phase reactor to tested power cable, by detecting the on-line monitoring that AC signal current realizes insulating to power cable.
Described CAN communication unit is according to the actual needs of transmission data, and select SJA1000 as CAN communication cell controller, the ATmegal16L in AVR single chip selected by single-chip microcomputer; Select CTM8251T as the interface chip of CAN controller and physical bus; SJA1000 is connected to CAN by serial data out line TX and serial date transfer RX line and isolates transceiver CTM8251T; CTM8251T is connected to physical bus by two bus end CANH and CANL with differential transmission and receiving function; A bus two ends build-out resistor in parallel, improves antijamming capability when data are transmitted and reliability; In industrial computer, develop CAN communication interface, the information of test macro is shown on CAN communication interface.
Advantage of the present utility model and beneficial effect are:
The utility model can be tested the insulating property characteristic of power cable fast, overcome by Low frequency signal injection method the deficiency that additional dc power supply method can not test power cable distributed capacitance over the ground, also preferably resolve the problem that sensitivity is low, error is large of power frequency method.Test process is simple, be easy to operation and good stability.Both can test the carrying out of wall scroll power cable insulation, can test many power cable insulation again; Meanwhile, result can be sent to industrial computer by CAN by test macro, is convenient to data analysis and longer-term storage.
Below in conjunction with the drawings and specific embodiments to the utility model detailed description in addition.
Accompanying drawing explanation
Fig. 1 is power cable insulating property test system structure sketch;
Fig. 2 is power cable insulating property test circuit figure;
Fig. 3 is CAN communication element circuit figure
In figure, 1 power cable; 2 insulating property test circuits; 3 signal processing units; 4AD converting unit; 5 single-chip microcomputers; 6 power supply units; 7 electrical networks; 8 control panels; 9 display units; 10CAN communication unit; 11 industrial computers; 12 low-frequency ac signal sources; 13 zero-sequence reactors; 14 three-phase reactors; 15 current transformers.
Embodiment
The utility model is a kind of power cable insulating property test macro, and as shown in Figure 1, Fig. 1 is power cable insulating property test system structure sketch.System comprises power supply unit 6, electrical network 7, single-chip microcomputer 5, display unit 9, control panel 8, CAN communication unit 10, industrial computer 11, signal processing unit 3, AD conversion unit 4, insulating property test circuit 2 and power cable 1, wherein the input end of power supply unit 6 is connected with electrical network 7, the output terminal of power supply unit 6 and industrial computer 11, the power input port of single-chip microcomputer 5 is connected, the input end of display unit 9 is connected with the signal output part of single-chip microcomputer 5, the output terminal of control panel 8 is connected with the signal input part of single-chip microcomputer 5, the input end of CAN communication unit 10 is connected with the PORT COM of single-chip microcomputer 5, the output terminal of CAN communication unit 10 is connected with the serial communication interface of industrial computer 11, the input end of signal processing unit 3 is connected with the signal output part of insulating property test circuit 2, the output terminal of signal processing unit 3 is connected with the input end of AD conversion unit 4, the output terminal of AD conversion unit 4 is connected with the signal input part of single-chip microcomputer 5, and the signals collecting end of insulating property test circuit 2 is connected with power cable 1.
As shown in Figure 2, insulating property test circuit 2 adopts low-frequency ac signal injection method to the utility model medium power insulating performance of cable test circuit figure, tests power cable insulating property.Insulating property test circuit 2 comprises low-frequency ac signal source 12, zero-sequence reactor 13, three-phase reactor 14, current transformer 15, wherein the output terminal in low-frequency ac signal source 12 is connected with one end of zero-sequence reactor 13, the other end of zero-sequence reactor 13 is connected with the neutral point of three-phase reactor 14, three-phase reactor 14 is connected with tested power cable 1, tested power cable 1 passes through from current transformer 15 punching, and the output terminal of current transformer 15 is connected with the input end of the signal processing unit 4 of test macro.Insulating property test circuit principle of work: the neutral point through three-phase reactor 14 gives tested power cable 1 note people low-frequency ac signal voltage, by detecting the on-line monitoring that AC signal current realizes insulating to power cable 1.The method can detect the AC impedance of power cable 1, and the D.C. isolation resistance detected than additional dc power supply method is closer to the actual insulation situation of power cable 1.
In the utility model, CAN communication element circuit as shown in Figure 3, and according to the actual needs of transmission data, select SJA1000 as CAN communication cell controller, the ATmegal16L in AVR single chip selected by single-chip microcomputer.For increase system communication distance, improve moment antijamming capability, reduce Radio frequency interference (RFI), etc., select CTM8251T as the interface chip of CAN controller and physical bus.SJA1000 is connected to CAN by serial data out line TX and serial date transfer RX line and isolates transceiver CTM8251T.CTM8251T is connected to physical bus by two bus end CANH and CANL with differential transmission and receiving function.A bus two ends build-out resistor in parallel, improves antijamming capability when data are transmitted and reliability.In industrial computer 11, develop CAN communication interface, the information of test macro is shown on CAN communication interface.。
The utility model power cable insulating property test macro course of work operation steps is as follows:
First, start control system by control panel 8, single-chip microcomputer 5 completes initialization operation and show " setup test " printed words on display unit 9.Then, start low-frequency ac signal source 12, neutral point through zero-sequence reactor 13 and three-phase reactor 14 gives tested power cable 1 note people low-frequency ac signal voltage, current transformer 15 gathers the current signal of power cable 1, after signal processing unit 3 and AD conversion unit 4, send to single-chip microcomputer 5.Finally, the data that single-chip microcomputer 5 pairs of current transformers 15 gather calculate the insulating resistance value of power cable 1, resistance value and required value are compared, judge the insulating property of power cable 1, and will calculate that data and judged result send can to display unit 9.Power cable 1 insulating property calculating data and judged result can be sent to industrial computer 11, the longer-term storage of complete paired data by CAN communication unit 10 by single-chip microcomputer 5.
Claims (5)
1. power cable insulating property test macro, it is characterized in that: be connected with electrical network (7) by the input end of power supply unit (6), the output terminal of power supply unit (6) and industrial computer (11), the power input port of single-chip microcomputer (5) is connected, the input end of display unit (9) is connected with the signal output part of single-chip microcomputer (5), the output terminal of control panel (8) is connected with the signal input part of single-chip microcomputer (5), the input end of CAN communication unit (10) is connected with the PORT COM of single-chip microcomputer (5), the output terminal of CAN communication unit (10) is connected with industrial computer (11), the input end of signal processing unit (3) is connected with the signal output part of insulating property test circuit (2), the output terminal of signal processing unit (3) is connected with the input end of AD conversion unit (4), the output terminal of AD conversion unit (4) is connected with the signal input part of single-chip microcomputer (5), and the signals collecting end of insulating property test circuit (2) is connected with power cable (1).
2. power cable insulating property test macro according to claim 1, is characterized in that: the output terminal of described CAN communication unit (10) is connected with the serial communication interface of industrial computer (11).
3. power cable insulating property test macro according to claim 1, is characterized in that: described insulating property test circuit (2) adopts low-frequency ac signal injection method, tests power cable insulating property; Wherein the output terminal of low-frequency ac signal source (12) is connected with one end of zero-sequence reactor (13), the other end of zero-sequence reactor (13) is connected with the neutral point of three-phase reactor (14), three-phase reactor (14) is connected with tested power cable (1), tested power cable (1) passes through from current transformer (15) punching, and the output terminal of current transformer (15) is connected with the input end of the signal processing unit (4) of test macro.
4. power cable insulating property test macro according to claim 1, it is characterized in that: described insulating property test circuit (2) notes people's low-frequency ac signal voltage through the neutral point of three-phase reactor (14) to tested power cable (1), by detecting the on-line monitoring that AC signal current realizes insulating to power cable (1).
5. power cable insulating property test macro according to claim 1, is characterized in that: described
CAN communication unit (10) is according to the actual needs of transmission data, and select SJA1000 as CAN communication cell controller, the ATmegal16L in AVR single chip selected by single-chip microcomputer; Select CTM8251T as the interface chip of CAN controller and physical bus; SJA1000 is connected to CAN by serial data out line TX and serial date transfer RX line and isolates transceiver CTM8251T; CTM8251T is connected to physical bus by two bus end CANH and CANL with differential transmission and receiving function; A bus two ends build-out resistor in parallel, improves antijamming capability when data are transmitted and reliability; In industrial computer (11), develop CAN communication interface, the information of test macro is shown on CAN communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520987181.1U CN205229392U (en) | 2015-12-02 | 2015-12-02 | Power cable insulating properties test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520987181.1U CN205229392U (en) | 2015-12-02 | 2015-12-02 | Power cable insulating properties test system |
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| CN205229392U true CN205229392U (en) | 2016-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403819A (en) * | 2015-12-02 | 2016-03-16 | 国家电网公司 | Insulating property testing system of power cable |
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- 2015-12-02 CN CN201520987181.1U patent/CN205229392U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403819A (en) * | 2015-12-02 | 2016-03-16 | 国家电网公司 | Insulating property testing system of power cable |
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