CN101701994A - Conduction insulation test method for low-frequency cable network - Google Patents
Conduction insulation test method for low-frequency cable network Download PDFInfo
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- CN101701994A CN101701994A CN200910237629A CN200910237629A CN101701994A CN 101701994 A CN101701994 A CN 101701994A CN 200910237629 A CN200910237629 A CN 200910237629A CN 200910237629 A CN200910237629 A CN 200910237629A CN 101701994 A CN101701994 A CN 101701994A
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Abstract
The invention discloses a conduction insulation test method for a low-frequency cable network, the proposal of testing insulation leakage characteristics comprises that: a certain lead wire is separated from other lead wires in a cable to be tested, other lead wires are short-circuited, and the test of insulation leakage characteristics for the lead wire with respect to other lead wires is completed at a time by using direct current high voltage current generated by a megger. And the proposal of testing low-frequency impedance characteristics comprises that: two adjacent lead wires in the cable to be tested are short-circuited, and the low-frequency impedance characteristics of the two lead wires are tested at a time by using a multimeter. The test method according to the invention has the characteristics of simple and convenient operation, less used tools, high test efficiency and the like, is more outstandingly advantageous for long well-laid cable network and particularly suitable for the requirement of onsite test.
Description
Technical field
The present invention relates to the method for testing of a kind of low-frequency cable insulation leakage characteristics and low-frequency impedance characteristic.
Background technology
The test of low-frequency cable network is the important component part of satellite development, ground testing system building.At present the test of cable system is comprised the test of insulation leakage characteristics and the low-frequency impedance characteristic test of cable.The method of testing of low-frequency impedance characteristic test is, ignores the influence of frequency to impedance, adds a direct current voltage at tested cable node two ends, according to Ohm law, calculates the low-frequency impedance characteristic of tested cable node.The method of insulation leakage characteristics test is; whether whether adopt dc high voltage to measure between the cable different conductor has the insulation protection of leakage current and cable to meet the demands; during measurement every in cable lead is carried out one by one; and require to cover whole lead combinations; when the lead number that comprises in the cable is more, will the ten minutes very complicated.
Number of patent application is 02136551, the Chinese patent that name is called " a kind of cable test device and method " discloses a kind of method that the vectorial property of cable is tested, this method mainly is to generate the standard input test vector by test vector generation equipment, and this normal vector is inserted an end of cable under test, utilize the test vector checkout equipment to obtain the test output vector of tested cable at the other end, the output test vector table of tested cable and the standard output test vector table of standard cable are compared, if come to the same thing, tested cable non-fault then is described, otherwise illustrates that this cable has fault.The method complex operation, test vector generate and the checkout equipment volume big, cost height, and the insulation characterisitic and the impedance operator that are not suitable for the common cable network are tested.
Number of patent application is 200910118052, the name be called " network cable test method and device " patent disclosure a kind of method that twisted-pair feeder is measured, this method mainly is the square wave excitation signal in the end input standard of cable under test, gather the response signal of the cable under test other end, judging cable strand by the size that compares the relative pumping signal of response signal whether mutually, is a kind of relatively method.Whether mutually what this method was mainly tested is cable under test strand, can not be used for the test of cable insulation characteristic and impedance operator.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of easy and simple to handle, tool using is few, testing efficiency is high conduction insulation test method for low-frequency cable network is provided.
Technical solution of the present invention is: a kind of conduction insulation test method for low-frequency cable network, comprise insulation leakage characteristics method of testing and low-frequency impedance characteristic test method,
The testing procedure of insulation leakage characteristics is:
(1) from the low-frequency cable network, chooses cable under test, will all be connected in series a switch on all leads in the described cable under test;
(2) end that is positioned at switch the same side of all leads is carried out being connected to behind the short circuit negative terminal of megohmmeter, an end that does not carry out short circuit that just is connected to any switch that lead is connected in series of megohmmeter by short circuit head;
(3) switch of lead that anode the connects serial connection of disconnection megohmmeter, the switch that is connected in series on simultaneously closed all the other leads;
(4) megohmmeter is placed " 500V " gear,, then judge lead that anode connects and all the other wire insulations of megohmmeter, otherwise judge that lead that anode connects and all the other leads of megohmmeter do not insulate, and exist leakage current if megohmmeter shows " ∞ ";
(5) repeating step (3)～(4) are carried out m time and are measured, and can finish the insulation leakage characteristics test of all leads in the cable, and wherein m is the lead number that comprises in the cable;
The testing procedure of low-frequency impedance characteristic is:
(A) from the low-frequency cable network, choose cable under test, an end of adjacent two leads in the described cable under test is carried out short circuit by short circuit head, make it to become isopotential point;
(B) for the other end of described adjacent two leads, adopt multimeter to test, obtain the low-frequency resistance value of two leads;
(C) resistance value that step (B) is obtained is divided by the 2 low-frequency resistance values that are solid conductor;
(D) repeating step (A)～(C) carries out m/2 time and measures, and can finish the measurement of all lead low-frequency resistance values in the cable.
Ultimate principle of the present invention is:
Adopt the inventive method leakage characteristics test of insulating, when measuring the insulation leakage characteristics of any lead, the switch that this root lead need be connected in series disconnects, and the switch closure that all the other leads were connected in series places megohmmeter " 500V " gear simultaneously.If this root lead and other wire insulations, then the anode of megohmmeter and negative terminal do not form test loop, and its meter pointer should point to " ∞ "; If this root lead and other any lead conductings, then electric current flows out from the anode of megohmmeter, via conducting place of two leads, by Closing Switch, flow back to the negative terminal of megohmmeter, thereby formed an electric loop again, have leakage current, what this moment, megohmmeter showed is a certain value.Like this, by being used in combination of megohmmeter and switch, a certain lead of cable under test and other leads are separated, and other leads are considered as a lead, the disposable insulation characterisitic of finishing is tested, and has improved testing efficiency effectively.
Adopt the inventive method to carry out the low-frequency impedance characteristic test, when measuring the low-frequency impedance characteristic of any lead of cable under test, this root lead is adjacent a lead carries out short circuit, measure the resulting impedance of these two lead series connection at the other end with multimeter at an end of cable.Because the line footpath of two leads, material, length are all consistent, thus the low-frequency impedance unanimity of two leads, so the total resistance that two leads are connected is divided by 2 low-frequency impedances that can obtain solid conductor.The method has effectively avoided long cable two ends to carry out the inconvenience that the low-frequency impedance characteristic test is brought.
The present invention's advantage compared with prior art is:
(1) method of testing of the present invention has reduced the time of cable system insulation leakage characteristics test and low-frequency impedance characteristic test, has improved the work efficiency of wireline test.For example to the leakage characteristics test of insulating of the cable of one 50 core, classic method need be measured number of times and be
And connect loaded down with trivial detailsly, make mistakes easily; And use measuring method of the present invention only to need 50 times switch to stir and data monitoring work, greatly improved work efficiency;
(2) method of testing of the present invention has realized the monolateral measurement (promptly realizing cable conducting measurement at an end of cable) of low-frequency impedance characteristic test, especially more obvious to the long cable system advantage embodiment that has laid, has significantly reduced human cost.For example the long cable to one 50 core carries out the low-frequency impedance characteristic test, only need carry out short circuit at an end of cable, the other end is measured, saved the test duration, and operation only needs personnel to get final product, personnel's confusing communication of having avoided double-end measurement to bring, problem such as make mistakes easily is particularly suitable for the on-the-spot test needs;
What (3) existing wireline test instrument all adopted is that classic method is measured cable, and cable tester volume heaviness costs an arm and a leg; Wireline test method of the present invention is with respect to cable tester, and method of testing is simple, the testing tool low price, takes up room for a short time, uses when being particularly suitable at the scene test cable.
Description of drawings
Fig. 1 is for adopting the inventive method leakage characteristics testing principle figure that insulate;
The schematic diagram of Fig. 2 for adopting the inventive method to carry out the low-frequency impedance characteristic test.
Embodiment
As shown in Figure 1, for adopting the inventive method leakage characteristics testing principle figure that insulate.During test, all leads in the cable under test are all connected be shorted to the negative terminal of megohmmeter after the last switch, an end that does not carry out short circuit that just is connected to a certain switch that lead is connected in series of megohmmeter, disconnect the switch that this lead is connected, closed rest switch, simultaneously megohmmeter is placed " 500V " gear, observe the megohmmeter meter pointer and whether point to " ∞ ", if megohmmeter pointed " ∞ ", then judge this root lead and all the other wire insulations, otherwise lead that anode connects and all the other leads of judging megohmmeter do not insulate, and have leakage current.Repetitive operation successively, the insulation leakage characteristics of all leads test in finishing cable.
As shown in Figure 2, the schematic diagram for adopting the inventive method to carry out the low-frequency impedance characteristic test.During test, one end of adjacent two leads in the cable under test is carried out short circuit by short circuit head, adopt multimeter to measure in the cable other end, obtain the low-frequency impedance value of two leads series connection, with measured resistance value divided by the 2 low-frequency impedance values that are solid conductor; Repetitive operation, the measurement of all lead low-frequency impedance values in finishing cable.
Embodiment
Be example with Y2-50 type cable below, the inventive method is further specified.
Y2-50 type cable includes 50 leads, during the leakage characteristics that insulate test, 50 hand switches of connecting with 50 leads of cable under test can be integrated on the interconnecting device, the end that all switches are connected with the cable under test lead leaves jack so that be connected the anode of megohmmeter, and the other end then is shorted to the negative terminal of megohmmeter.During actual the test, closed all switches, if need the insulation leakage characteristics of the 1st lead of test cable under test, then the reservation jack with the 1st switch on the anode of megohmmeter and the interconnecting device links to each other, disconnect this switch simultaneously,, prove this root lead and all the other wire insulations if this moment, the megohmmeter meter pointer pointed to " ∞ ", otherwise think that this lead and all the other leads do not insulate, and exist leakage current.In like manner verify the insulation leakage characteristics of the 2nd lead, operate successively 50 times, can finish the insulation leakage characteristics test of cable under test.
When carrying out the low-frequency impedance characteristic test, can make the short circuit head of one 50 core, this short circuit head makes adjacent 2 short circuits by methods such as welding, promptly 1 with 2 short circuits, 3 and 4 short circuits ... 49 with 50 short circuits.This short circuit head is inserted an end of cable under test, measure the impedance between 1 and 2 of the cable under test other end with multimeter, with measured resistance value divided by 2 resistance values that are the 1st lead of cable under test and the 2nd lead, measure successively between 3 and 4, between 5 and 6 ... the resistance value between 49 and 50, after promptly carrying out measuring for 25 times, finish the low-frequency impedance characteristic test of cable under test.
The content that is not described in detail in the instructions of the present invention belongs to those skilled in the art's known technology.
Claims (1)
1. conduction insulation test method for low-frequency cable network is characterized in that comprising: low-frequency impedance characteristic test method and insulation leakage characteristics method of testing,
The testing procedure of insulation leakage characteristics is:
(1) from the low-frequency cable network, chooses cable under test, will all be connected in series a switch on all leads in the described cable under test;
(2) end that is positioned at switch the same side of all leads is carried out being connected to behind the short circuit negative terminal of megohmmeter, an end that does not carry out short circuit that just is connected to any switch that lead is connected in series of megohmmeter by short circuit head;
(3) switch of lead that anode the connects serial connection of disconnection megohmmeter, the switch that is connected in series on simultaneously closed all the other leads;
(4) megohmmeter is placed " 500V " gear,, then judge lead that anode connects and all the other wire insulations of megohmmeter, otherwise judge that lead that anode connects and all the other leads of megohmmeter do not insulate, and exist leakage current if megohmmeter shows " ∞ ";
(5) repeating step (3)～(4) are carried out m time and are measured, and can finish the insulation leakage characteristics test of all leads in the cable, and wherein m is the lead number that comprises in the cable;
The testing procedure of low-frequency impedance characteristic is:
(A) from the low-frequency cable network, choose cable under test, an end of adjacent two leads in the described cable under test is carried out short circuit by short circuit head, make it to become isopotential point;
(B) for the other end of described adjacent two leads, adopt multimeter to test, obtain the low-frequency resistance value of two leads;
(C) resistance value that step (B) is obtained is divided by the 2 low-frequency resistance values that are solid conductor;
(D) repeating step (A)～(C) carries out m/2 time and measures, and can finish the measurement of all lead low-frequency resistance values in the cable.
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| CN2009102376297A CN101701994B (en) | 2009-11-13 | 2009-11-13 | Conduction insulation test method for low-frequency cable network |
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| CN2009102376297A CN101701994B (en) | 2009-11-13 | 2009-11-13 | Conduction insulation test method for low-frequency cable network |
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| CN102621462A (en) * | 2012-04-16 | 2012-08-01 | 哈尔滨工业大学 | Multiway cable rapid insulation detection system and multiway cable insulation detection method |
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| CN102680859A (en) * | 2012-05-31 | 2012-09-19 | 北京空间飞行器总体设计部 | Conduction and insulation testing method for cable network |
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