JPH0257870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable circuit testing device capable of testing connection relationships between cable terminals in equipment having a plurality of cables.

In factory equipment with multiple cables,
If a sufficient number of years have passed since the installation of electrical equipment, the connection relationships between cable terminals are unclear, and when expanding or changing equipment, it is necessary to test them. Conventionally, this test is performed using a tester or the like with the cable in a power outage state, but such power outage work has to be done during the day or at night due to the customer's convenience, making it easier to perform energization tests, etc. I couldn't do it properly, and my work efficiency was poor.

The present invention has been made in view of the above circumstances, and its purpose is to provide a cable circuit testing device that allows testing of cables in a energized state and allows work on electrical equipment to be performed with high efficiency. It is in.

The present invention will be described below based on embodiments shown in the accompanying drawings.

As shown in Fig. 1, a timer circuit 3 is provided between two connecting parts 1a and 1b that can be connected to cable terminals via a power switch 2, and a timer circuit 3 is connected to the timer circuit 3 via a control contact 3a. A load 4 is connected in parallel.

Timer circuit 3 has fuse 5 and 100V and 200V
The timer 7 is energized through the first contact 6a of the changeover switch 6 that switches between the timer 7 and the timer 7, which is energized through the fuse 5, the second contact 6b of the changeover switch 6, and the timer contact 7a of the twin timer 7.
It is equipped with a first relay 8 for 100V and a second relay 9 for 200V. The control contact 3a is constructed by connecting the make contacts 8a and 9a of the relays 8 and 9 in parallel, and the load 4 is connected to the first bulb 10 for 100V and the second bulb 10 for 200V by the third contact 6c of the changeover switch 6. It is configured so that you can choose one of the bulbs. Incidentally, when the twin timer 7 is energized, it periodically controls the timer contact 7a to turn on and off, and by adjusting the knob 7, the period can be arbitrarily set.

The present invention has the above configuration, and its use etc. will be explained next. In addition, multiple 3-core cables
As shown in Fig. 2, A ₁ , A ₂ ...An are connected between the power distribution board 12 on the field side and the low voltage panel 13 in the electrical room, and the cables A ₁ , A ₂ ...An are connected to the terminals on the power distribution board 12 side. B ₁ ,
B ₂ ...Bn, the terminals on the low voltage plate 13 side are C ₁ , C ₂ ...Cn, and the terminals of cables A ₁ , A ₂ ...An are B ₁ , B ₂ ...Bn.
Assume that it is unknown that C ₁ , C ₂ ...Cn.

Now, it is assumed that a test is to be performed to determine which of the terminals C ₁ , C ₂ . . . Cn of the low voltage panel 13 the terminal B ₁ of the distribution board 12 is connected to. First, select any two terminals _B1 and connect the connecting parts 1a and 1b,
Operate the changeover switch 6 so that the voltage becomes the terminal voltage of terminal _B1 . Here, the terminal voltage of terminal _B1 is 100V, and each contact 6a, 6b, 6c of changeover switch 6
are connected as shown by the solid line.

Next, when power switch 2 is turned on, terminal B ₁
Power is supplied to the timer circuit 3 from 1st
The lamp 10 is energized and blinks at a predetermined cycle. Therefore, terminal C ₁ on the low pressure chamber side connected to terminal B ₁
As shown in Figure 3, a current I ₀ +I, which is the sum of the equipment load current I ₀ and the rectangular lamp load current I, flows. It is a measuring device that can measure current by simply connecting the terminals C ₁ , C ₂ ...Cn
If you read the current sequentially by inserting it into a breaker etc. connected to the lamp load current I, the clamp meter pointer will swing within the range of the lamp load current I only when testing the current at terminal _C1 connected to terminal _B1 . By terminal
You can check C ₁ .

In addition, when the equipment load current is not a nearly constant value but repeats two current values at a predetermined period, and it is difficult to confirm the connection relationship between the terminals of the distribution board 12 and the low voltage board 13, the twin timer 7 knob 7
By changing the cycle of the lamp load current according to b, the connection relationship can be easily confirmed.

In the above embodiment, the twin timer 7 may be configured by an electronic circuit using a transistor or an integrated circuit, and the first and second relays 8 and 9 may be omitted to control the contacts of the twin timer 7. It can also be used as a contact point. Alternatively, the timer circuit 3 may be constructed of an electronic circuit, and the control contact 3a may be an electronic switch.
Further, it is desirable that the connecting portions 1a and 1b be easily connected to the terminals B ₁ , B ₂ . . . using clips or the like.

As described above, the present invention includes two connections connected to a cable terminal, a timer provided between these connections to periodically turn on and off the contacts, and a timer provided between the connections via these contacts. Because it is equipped with a load, in equipment with multiple cables, you can connect the connection part to one end of any cable and read the current sequentially at a panel such as a low voltage panel or distribution board that has the other end of the cable. For example, it is possible to check whether the terminals connected to both ends of the cable are energized based on the current value, and work on electrical equipment can be done on weekdays instead of on holidays, improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an example of the present invention, FIG. 2 is a wiring diagram showing the relationship between a distribution board and a low voltage board, and FIG. 3 is a graph showing the relationship between current and time. 1a, 1b...Connection part, 2...Power switch,
3...Timer circuit, 3a...Control contact, 4...Load.

Claims (1)

[Claims] 1. Two connecting parts connected to a cable terminal;
A cable circuit testing device consisting of a timer provided between these connections to periodically turn on and off contacts, and a load provided between the connections via these contacts. 2. The cable circuit testing device according to claim 1, wherein the timer has an adjustable cycle.