JPS6141974A - Testing device of multiconductor cable - Google Patents

Abstract

PURPOSE:To measure insulation resistance efficiently without influenced by high humidity in atmosphere by arranging plural cables to be tested in parallel and selecting the cable to be tested successively by switching of relay circuits. CONSTITUTION:Measuring terminals of a continuity tester 2 and a megger 3 are connected to cables I, II to be tested arranged parallel through relays housed in a relay box 5. Relays in the relay box 5 are relay group A (A1, A2, A3), relay group B (B1, B2, B3), relay group C (C1, C2, C3), and besides above, relay group D (D1, D2, D3) that select an input end 6 and an output end 7 of the cable out of cables I, II to be tested and relay group E (E1, E2, E3) are added. Accordingly, at the time of completion of test on the cable I, relay groups D, E are switched by control of a sequencer 8, and a test on the cable II is performed continuously. As each relay used is inert gas sealed type, measurement of insulation resistance of above about 2,000MOMEGA is possible even when atmospheric humidity is high.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a test device for testing continuity and insulation of each core wire of a multi-core cable.

(Prior Art) In the final product inspection of a multi-core cable, a continuity test of the core wires and an insulation resistance test between each core wire are performed. Conventionally, as shown in FIG. 3, the continuity test of the multi-core cable 1 using the continuity tester 2 and the insulation resistance measurement using the insulation resistance meter 8 are performed in separate steps. Generally, a rotary switch 4 is used to switch each core wire of a multi-core cable connected to a meter.

In order to simplify the above process, a continuity/insulation testing device has also been put into practical use, which is equipped with a relay box 5 as shown in Figure 4, and uses the relay to switch between continuity testing and insulation resistance measurement. There is. The configuration and operation of the continuity/insulation testing device shown in Figure 4 will be briefly explained below. In order to simplify the drawings and explanation, the number of cores of the multi-core cable under test was assumed to be eight.

T, ,T, ,T, is a mechanical or electronic changeover switch (not shown) that converts the test signal from the continuity tester (not shown).
Input terminals input via T1゜T/, , T/
, are output terminals that output the test signal via the multi-core cable under test 1 (hereinafter referred to as "test cable").

This output terminal rfV, , T/, .

? , includes a continuity signal extraction circuit (not shown) and display means (for example, a meter, indicator lamp, etc.) for displaying the continuity test results.
) are connected. T4 is a terminal to which a high voltage from an insulation resistance meter 8 (not shown) is applied.

The relay box 5 is connected to a first relay group (relay person, 1 person *-As>) that switches between a continuity tester and an insulation resistance meter connected to the input end 6 of the test cable 1, and a test cable Connect output terminal 7 to output terminal T'1. T', , T
A second relay W (
IJ L/-Bl l Bt lBs) and a third relay for selecting the core wire of the test cable 1 to be subjected to an insulation test, applying a high voltage for the insulation test, and grounding the remaining core wires. group (relay Cs, Ct-Cs
).

Next, the operation will be explained. In the case of FIG. 4, the device is in a state when conducting a continuity test. Relay A,,A.

The contacts of , person, are on the left side, and the contacts of relays B, , B, , Bs are also on the left side, making it possible to conduct a continuity test. The contacts of relays CX, C, , C, may in this case lie on either side. An electrical signal is sent from the input terminal Tl to the output terminal Ill/ on the output side.

If you receive that signal from only that heart 4! (I1) is normal. Thereafter, the continuity test of the cap stone @ (#Z, well 8) is performed by sequentially switching to T, , T, and so on.

For insulation resistance tests, relays Al, A,.

Move the contacts of person 8 to the right, and the contacts of relays B, , B, , B, to the right (.Put the contacts of relay C1 to the left, C!, C
By tilting the contacts of , to the right side, the insulation resistance between the core wire 1 and the other core wire 2.44-8 can be measured. By sequentially changing the relay to the left side to C, C, I! between each line! 1g & resistance can be measured.

(Problem to be solved) In the conventional continuity/insulation test equipment (Fig. 4) described above, each relay and circuit are prepared and equipped only for testing one test cable, and one The operator must wait while the cable is being tested. On the other hand, the test equipment will be idle while the operator is replacing the test cable.
It was extremely inefficient.

Furthermore, since the relay circuit has a complicated structure, the insulation resistance value within the relay circuit is low, and the entire measurement system can only measure up to about 1000 MΩ at most. Particularly when the humidity in the atmosphere is high, there is a problem that the resistance drops to 500 MΩ or less.

The purpose of this invention is to solve the above-mentioned problems and provide a test device that can efficiently measure insulation resistances of 2000 MΩ or more even when atmospheric humidity is high.

(Means for Solving the Problems) In order to achieve the above object, the test device of the present invention arranges a plurality of test cables in parallel, sequentially selects the cables to be tested by switching a relay circuit, and The continuity and insulation tests for each core wire of the selected multi-core cable were performed by sequentially switching the relay circuit.

In addition, each relay was housed in a relay box, and each relay was of an inert gas filled type (commercially available) so that it would not be affected by humidity. Each relay is controlled by a sequencer (sequence controller) that receives an operation command (start signal) and outputs a relay drive signal.

(Function) As described above, in the test apparatus of the present invention, a plurality of test cables arranged in parallel are sequentially switched using a relay circuit to perform the test, so that the test can be completed while one cable is being tested. Since the removed cable can be removed and a new test cable can be set, the operator does not have to wait and work efficiency is improved. Furthermore, since each relay uses an inert gas-filled tank, it is less susceptible to the effects of humidity, and insulation resistance can be measured with high accuracy.

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the testing device of the present invention. The measurement terminals of the continuity tester 2 and the insulation resistance meter 8 are connected to the test cables 1-+ and l-z (two cables are used here) via the relays housed in the relay box 5.
connected to. Each relay in the relay box 5 is switched by a drive signal from the sequencer 8. The pass/fail judgment results of the continuity test and insulation test are determined by the sequencer 8 above.
is sent to the display means via.

FIG. 2 is a circuit diagram showing the connection of each relay in the test apparatus of the present invention. In order to simplify the drawings and explanation, the number of test cables is two and the number of core wires thereof is eight. Further, in the figures, the same reference numerals as those described above indicate the same or equivalent parts, and explanations of the configuration and operation will be omitted as appropriate.

As is clear from the figure, the test device of the present invention has the same basic configuration as the conventional test device shown in FIG. are arranged in parallel, and a fourth relay group (relays Ds, Dt, Ds) and a fifth relay group (relays) select the input end 6 and output end 7 of the cable under test. The difference is that E1 , E, , 1) are added. In this embodiment, each relay of the first to fifth relay groups uses an inert gas filled melon.

In FIG. 2, the test cable 1-8 (cable I) is in a state when conducting a continuity test. The operation is basically the same as the conventional one (the one in Figure 4), but relays D1, D, , D, and relays E, , E, , E are switched when the cable I test is completed. , the difference is that the cable ■ test is conducted continuously. In the explanation of the above example, the case where two 8-core cables were arranged as the test cable was described, but the invention is not limited to this, and by increasing the number of relays according to necessity, 8 or more cables can be arranged in parallel. Needless to say, it becomes possible to arrange the wires in a larger number of wires, and it goes without saying that a larger number of core wires can be tested.

(Effects) As explained above, according to the test apparatus of the present invention, while testing one cable, the operator can replace the other cable, and each time the test is completed, This eliminates wasted time for both test equipment and operators, improving efficiency.

Furthermore, since the relay is of an inert gas filled type, it is possible to measure 2000 MΩ or more even when the atmospheric humidity is high.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the test device of the present invention, Fig. 2 is a circuit diagram showing the connection of each relay of the test device of the present invention, Fig. 3 is an explanatory diagram of the conventional test process, and Fig. 4 is a conventional conduction diagram. - It is a circuit diagram showing the connection of each relay of the insulation testing device. 1 (Ls, 1-z)...Multi-core cable, 2...Continuity tester, 8...Insulation resistance meter, 5...Relay box, 8...Sequence, AI r Az r A3
r B@B! B3+C,,C,,C,,D,,
D,,D,,B,,B. ,E,...Relay.

Claims (1)

[Claims] 1. A test in which the multi-core cables to be tested are sequentially selected from among a plurality of multi-core cables to be tested, and the continuity and insulation tests of each core wire of the selected multi-core cables are sequentially switched. A device that selects a continuity tester, an insulation resistance meter, and the multi-core cable to be tested, and sequentially connects each core wire of the selected multi-core cable to the terminals of the continuity tester and the insulation resistance meter. 1. A test device for a multi-core cable, comprising: a relay box having a plurality of relays for performing the test; and a sequencer for receiving an operation command and driving each relay in the relay box. 2. The relay box has a first relay group that switches between a continuity tester and an insulation resistance tester connected to the multi-core cable under test, and a first relay group that connects the output end of the multi-core cable to the continuity signal extraction circuit during continuity testing. During an insulation test, a second relay group opens the output end of the multi-core cable, and a high voltage for insulation testing is applied to the core wires of the multi-core cable under test to be tested, and the remaining core wires are a third relay group for grounding, and fourth and fifth relay groups for selecting the input end and output end of the multi-core cable to be tested from among the plurality of multi-core cables to be tested. A multi-core cable testing device according to claim 1. 3. The multi-core cable testing device according to claim 1 or 2, wherein all the relays provided in the relay box are inert gas filling relays.