JPS59154372A - Alarm line locating automatic tester - Google Patents

Abstract

PURPOSE:To reduce considerably the time and the labor of trouble-shooting by inputting various kinds of identifying signal different in transmission time, transmission number, frequency, etc. to a gate and transmitting the output of the gate to alarm lines or other communication lines. CONSTITUTION:A tester is constituted with a loop detecting circuit 11 which detects the loop state of a pair of alarm line L1 and L2, a gate 12 which is opened by the output of the circuit 11, an inter-line insulation defect detecting circuit 13 which detects the insulation defect between alarm lines L1 and L2, a gate 14 which is opened by the output of the circuit 13, a detecting circuit 15 of insulation defect to earth which detects the insulation defect of alarm lines L1 and L2 to the earth collectively or individually, a gate 16 which is opened by the circuit 15, a signal pattern control part 17 which modulates the input signal from an oscillator with long and short pulse signals to output plural kinds of identifying signal different in pattern, and a detecting circuit control part 18 which operates circularly the loop detecting circuit 11, the inter-line insulation defect detecting circuit 13, and the detecting circuit 15 of insulation defect to the earth.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tester for isolating insulation-degraded sections of cables and other cables.

Conventionally, the section where the insulation of the alarm wire has deteriorated due to water ingress of the PEF cable, etc. is tested by fully opening the cable joint,
The alarm wire must be strained and cut at the contact point (7) and the insulation of l111 must be fully tested to see if it has deteriorated (therefore, there is no wart).This method requires a lot of effort and time from the maintenance personnel. In order to eliminate this drawback, if
Inside the lead pipe 3 of the CP E F'ri pull 1, connect the "lead 6" in series to the phase wire 4, and connect the 1till f from the cable 91 section.
A method has been proposed for the Kuguru disorder's part separation, which made it possible to sterilize the opening and closing of the Reet switch 6, in contrast to the near future of the former Tsukukyo Soto 7 (Benkyo Gansho [56 Year No. 135709 1.?J Kaisho 57 20 t
, l b 72 +-3-diasho),.

In addition, in the figure V, 2 is a regular coast line, and 5 is a bias line. The reed switch 6 is always closed by the bias magnet 5, and the control
○According to this method, the bias magnet 7 is brought closer and the magnetic field of the bias magnet 5 is weakened.
By measuring the insulation resistance of the alarm wire 4 from one end of the cable l, and conducting a complete test to see if the insulation resistance recovers when the reed switch 6 is opened, it is possible to determine in which direction the insulation failure section is located. Can be tested. With this method, it is possible to test 8J by operating the cut from the outside without removing it from the 3t lead pipe cable. The maintenance person inside the station where one end of the cable 1 was drawn in and the maintenance person who went to the point to cut the cable 1 must communicate with each other. Another drawback is that depending on the location, it may take a very long time to contact the person.

Furthermore, since the reed switch 6 is hidden inside the lead pipe 3, the operator cannot directly check whether the reed switch 4 is on or off, which may lead to an erroneous determination.

The present invention solves the above-mentioned conventional drawbacks, and allows automatic testing of PEF alarm wire separation to isolate poor insulation sections without fully opening the cable connection and without contacting the on-site maintenance personnel. It is about providing the equipment.

The tester of the present invention includes a loop detection circuit that detects all loop states of the alarm wire, an insulation defect detection circuit that detects insulation defects between the alarm wires, between the wires and ground, and the outputs of the various detection circuits described above. Each gate is equipped with a detection circuit control section that sequentially and cyclically operates the various detection circuits described above, and each MfJ gate is manually supplied with various identification signals having different transmission times, number of transmissions, frequencies, etc. and the output of the gate is sent to the alarm line or other communication line.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a block diagram showing one embodiment of the present invention.

That is, the loop detection circuit 1 detects all the loop states of the pair of phase supply lines 1g and 1J2, and the loop detection circuit 1
Gate 12 opened by the output of 1, and @ = signal line 1
．． A line insulation failure detection circuit 13 that detects all line insulation failures in L2, a gate 14 that is opened by the output of the line insulation failure detection circuit 13, an alarm line, and a group of L2 ground insulation failure sections. 110 is 1. , , a ground insulation failure detection circuit 15 that detects each L2, a gate 16 that is opened by the output of the earth insulation failure detection circuit 15, and a human input signal from an oscillator (for example, 1000 Hz IL).
A signal pattern 1ilJ tf11 unit 17 that modulates the l-fold signal into long and short pulse signals and outputs all the plurality of identification signals of mutually different patterns, and a loop detection circuit 11
．． Line insulation defect detection circuit 13. Detection circuit side (foundation) part 1 that sequentially and cyclically operates the anti-ground insulation defect detection circuit 15
It consists of 8. Signal pattern system (foundation) department 17
and the detection circuit control section 18 operate in conjunction with the output pulse of the same timer 9. While the loop detection circuit 11 is operating, the signal pattern control section 17 is operated manually by the gate 12.
A specific pattern of identification signals is manually generated. Similarly, when the line insulation defect detection circuit 13 is in operation, another pattern of identification signal is input to the gate 14, and while the ground insulation defect detection circuit 15 is in operation, another pattern of identification signal is input to the gate 16. The identification signal is manually generated. The anti-ground insulation failure detection circuit 15 and the gate 16 are connected to the alarm line LllL2. It is desirable that the two sets work together to detect all L2 separately. The input signal to the gates 12, 14, 16, etc. is a loop signal A indicating that the alarm line is in a loop state.
Line-to-line insulation failure signal B, L, which indicates that the resistance value between , L, and -L2 is low at a predetermined resistance value, r, and L, and L1, which indicates that the earth insulation is defective.C9, which indicates that the earth insulation is defective. This is an L2 ground failure signal, etc., and the signal pattern system (f111 part 17 is a manual signal (for example, 100
An audible signal with 0 cycles) is created by completely discontinuing the signal. These signals are, for example, as shown in FIG. 3, signals of a predetermined length and a predetermined number of repetitions allotted to a predetermined time within a repetition period of 16 seconds. For example, loop signal A is 2
It is a long signal of seconds, L, ground fault signal C is a 0.5 second dot signal once, L2 ground fault signal is a 0.5 second dot signal twice, line fault signal B is 0.5 seconds long. It is represented by three dot signals. These identification signals are sent to the gate 12, respectively.
, 14, 16, etc., to the alarm lines Ll and b2. Therefore, if the alarm wire is in a loop state, the loop state is detected by the loop detection circuit 11, gate J2 is opened, and loop signal A shown in FIG. 3 is sent out, and if the insulation between L1 ground is defective, LH ground A defect signal C is sent out, an L2 ground defect signal is sent out if the L2 ground is defective, and an inter-line defect signal I3 is sent out if the line insulation is defective.

If the alarm line is not in a loop state, loop signal A will not be sent out. It goes without saying that the other identification signals indicating various types of insulation defects are also 0, which is not sent out when the insulation resistance is greater than a predetermined value. Further, the various identification signals mentioned above are periodically outputted every 16 seconds. Note that the output of the gates 12, 14, and 16 may not be sent to the alarm line, but may be sent to one of the other communication lines or a wireless line.

The loose detection circuit 11 is operated by the control l of the detection circuit control section 18, and the loop current is detected by applying the full voltage between the alarm wires , and 52, and when the loop current exceeding a predetermined value flows, the gate 12 is activated. open. When game day 2 is opened, a 2 second loop signal A as shown in FIG. 3 is sent to the alarm line. (At 'K', the insulation failure detection circuit 15 to earth is activated to test the insulation between the positive and negative earths, and if the insulation resistance is below a predetermined value, the JJI earth failure signal C is sent.Next,
The phantom earth insulation failure detection circuit 15' (not shown) operates and similarly tests the L2 earth insulation, and if it is defective, it
The line fault detection circuit IQ13 is outputted, and the Katsuma insulation fault detection circuit 13 operates and the line fault detection circuit 13 is output when the fault occurs. It is configured as shown below. That is, alarm wires 1, , 5
A positive and negative power supply (for example, 1 s o V) is connected between R and H through a variable resistor R1 and a switch 81, and Ll.

The voltage between 52 and 10,000 input terminals of the comparator 20 is manually powered. The switch 81 is turned on by the control 1 of the detection circuit control circuit 18. The other input terminal of the comparator 20 receives a comparison voltage obtained by dividing the voltage by a voltage divider 21 to, for example, 1/2. If the insulation resistance between L, , 1 and 2 is a dog, the input vehicle pressure of comparator 2o is the comparison voltage, ! : Since there are 9 points, the comparator 2o has no output. When the insulation resistance between L, , and 52 is significantly lower than the PfT value, comparator 2o
The input voltage of is lower than the comparison voltage & then comparator 2
The output of o becomes high level. This allows gate 12
will be held. The resistance value to be detected as an insulation defect can be arbitrarily set by adjusting the variable resistance R1.

The anti-ground insulation defect detection circuit 15 is also similar to the above (b).
It can be composed of roads.

Next, a method of performing a cutting test using an automatic cutting machine according to the present invention will be explained. First, as shown in Fig. 5, this section connects one end of the CIJ signal line 4 of the tester 30i, and also connects the output Q (for example, lk) of the external oscillator 4o.
00 hertz signal).

I) Inside the lead pipe 3 at the connection point of the EF cable 1, a reed switch 6 as shown in Fig. 1 is connected in series to the alarm wire 4, and under normal conditions, the alarm wire 4 is connected to the other end of the PEF cable l. It is extended and the other party's terminal is in an open state. In this state, the variable resistor R, 2 of the line insulation failure detection circuit 13 is adjusted to set it close to the limit at which line insulation failure is detected and line failure signal B (dot signal 3 times) is sent.

If the signal B is not sent out even if the variable resistance R,2 is set to the maximum value, set the oJ variable resistance R1 to its maximum value. Similarly, adjust the variable resistor of the earth insulation failure detection circuit 15 so that the L1 earth failure signal C (one short dot signal) is sent out, and make the same setting. 2 point signals] are sent.

Next, all terminals on the other side of the alarm line 4 are short-circuited. Preferably, the short circuit is made via a diode. In this state, when the search coil 50 is completely approached from the outside of the lead pipe 3 at an arbitrary cut position, the cut is detected by the loop signal A sent from the tester 30.
is guided to the search coil 50, amplified by the amplifier 51, and output as sound from the speaker 52. In addition, another identification signal [3°C, D can also be confirmed as sound. Identification signals A, B, C, I), etc. are output sequentially at a 16-second cycle, so each identification signal can be easily confirmed (however, various insulation tests are performed using polarity that does not pass through the diode shorted to the other terminal). (shall be tested by voltage of Not done. Check these conditions in advance. (At 'K', bring the magnet 7 close to the top of the lead pipe 3 and listen for the reed switch 6 (see Figure 1). The opening of the reed switch 6 is confirmed by the stoppage of the identification signal A. At this time, for example, if it has been confirmed previously and the fC identification signal has stopped, the section of the L1 ground insulation failure section will be ``'' than the position.
If the identification signal C is outputted continuously, the section L and the ground insulation defect section are located at the upper side of the section F 9Ill (terminal side). The same applies to other insulation failure signals. Identification signals A, B, C, D, etc. are sent to the reed switch 6
In order to completely prevent weakening due to opening of the reed switch 6, it is desirable to connect a capacitor in parallel to the contacts of the reed switch 6. This is not necessary if the identification signal is not sent to all alarm lines but is sent to other communication lines.

By changing the cutting point and testing the cutting one after another using the same operation, it is possible to determine all the C insulation defective sections.

In this embodiment, the loop signal A, line insulation defect number B,
Identification signals such as L1 ground fault signal ('1-L2 ground fault off) were distinguished by the length and shortness of the 1000 Hz audible signal and the number of dot signals, but these signals can be distinguished by, for example, using different frequencies. It is also possible by

As described above, the present invention includes a loop detection circuit that detects all loops of the alarm line, an insulation failure detection circuit that detects insulation failure of the alarm line, and a gate that is opened by these outputs. Is it a loop signal when is in a loop state? In addition, in the case of poor insulation of the alarm wire, identification signals are sent to all alarm wires or other communication lines indicating defects between the wires, between the L1 wires, between the L2 ground, etc., so the cable If a reed switch or the like that can be opened and closed by external operation is connected in series with the alarm line at the connection part, the opening/closing operation of the reed switch can be performed by disconnection of the loop signal 1c sent to the alarm line. It is possible to check from the outside, and at the same time, it is possible to check the defective insulation area [the section marked by "■" is for all the lines +"
This can be done by issuing an identification signal indicating a failure such as between L ground and L2 ground, or by emitting a stop sound IAE. Testers can perform isolation tests to isolate poor insulation sections without opening cable connections and without having to contact the on-site maintenance personnel, which greatly reduces the time and effort required to search for faults. This has the effect of reducing

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a bonding part of a P19F cable, Fig. 2 is a block diagram showing an embodiment of the invention, Fig. 3 is a loop signal, a line insulation fault signal + "l ground fault signal, and Time chart showing an example of L2 ground failure, $
Figure 4 is a circuit diagram showing an example of a line insulation defect detection circuit.
The figure is a diagram for explaining a method of performing a cut-off test using a cut-off tester in Example 2. In the figure, 1...P-EF cable nope 2...Communication line, 3...Lead pipe, 4...Phase line, 5...Bias magnet, 6...Reed switch, 7...・Magnet for opening 1, 11-...Loop detection circuit, 12,
14.16...Gate 13...Line insulation failure detection circuit, 15...Earth insulation failure detection circuit, 17...
・Signal pattern suppression part 1, 18...detection circuit control part,
19...Evening/1 Ma, 20...Comparator, 21.
... Voltage divider, R1... Variable resistor, Sl... Switch, A... Loose signal, B... Line insulation failure signal, C
・-・], J1 ground failure signal, D...L2 ground failure outside, L, , L,,... Alarm line. Applicant: Japan Automobile Telephone Corporation Agent Patent Attorney: 1) Toshi So 3rd Cause Figure 4 1 397-

Claims (1)

[Claims] (1) A loop detection circuit that detects the loop state of the alarm wire, and an insulation defect detection circuit that detects all insulation defects between the alarm wires, between them and the ground, etc.; The gate 1m is equipped with a detection circuit control section that sequentially and cyclically operates all of the various detection circuits, and the gate 1m inputs various identification signals having different transmission times, number of transmissions, frequencies, etc., and controls the output of the gate. The alarm line shall be sent to the alarm line or other communication line, etc., and the alarm line shall be disconnected by an automatic tester. (2. The alarm wire separation described in claim 1 is provided in an automatic tester, and the alarm wire connected to the automatic tester is
A means for externally detecting the leakage magnetic flux of the various identification signals sent to the alarm line by inserting switch contacts in series that are opened and closed by an operation from the outside of the cable connection part.
Symptoms include getting j+M.