DE1022641B - Circuit arrangement for manually operated fire-weather protected telephone exchanges - Google Patents

Description

GERMAN

The invention relates to a circuit arrangement for telephone exchanges protected from fire weather with on different subscriber connection lines adjustable subscriber switches and aims to provide means that allow the Operating condition of the system, in particular the insulation condition of the subscriber lines, more convenient than so far to check.

The monitoring of the insulation value of subscriber lines underground has so far encountered major problems Difficulties because the devices and distributors are opened and the lines are disconnected to measure the lines Need to become. Also, measuring the lines is only possible because of the risk of firedamp certain conditions possible,

It is known the subscriber lines of telephone systems to check that an automatically progressing contact system via one of Step switch controlled by him connects a test device one after the other to the lines to be tested and brings it to effect. This facility is built very cumbersome on the one hand, as they except the actual switch for the various measuring tasks is a particularly automatic one Contains contact system to which all subscriber lines to be checked are individually connected must be. Due to the inevitable successive shutdown of the individual subscriber lines there are also certain operational difficulties. For installation in a Firedamp-proof telephone exchange, this arrangement is out of the question.

The invention sets itself the task without use of tools or without opening any devices any subscriber line of the firedamp protected Telephone system through simple operation, firedamp-proof switches and without Check intervention in the circuit and without impairing the ongoing telephone traffic. This is done according to the invention in that one of the connecting lines accessible to all rotary switches connected to a test device known per se for the subscriber lines is. The measuring switch of the test device points in a manner known per se in addition to its rest position Measurement positions for the insulation resistance of the two lines of each participant to one another and each of the two lines to earth as well as a measuring position for measuring the battery voltage on. In a further position, the measuring switch can be connected to a rheostat via the existing Central battery must be placed on the measuring instrument in order to calibrate its zero point for the ohmmeasurement can.

Circuit arrangement

for manually operated, firedamp-proof telephone exchanges

Applicant:
Wilhelm Vershoven, Essen, Sedanstr. 4th

Wilhelm Vershoven, Essen,
has been named as the inventor

The measuring switch, which works with five contact arms on five contact groups, can switch one after the other to the positions »Off«, »Check battery voltage«, »Calibrate measuring instrument«, »Insulation test between both subscriber lines «and» insulation test between earth and one or the other of the two Subscriber Lines «can be set.

The connecting cable used to connect the measuring switch to the various subscriber rotary switches is in certain, z. B. in the first three positions of the measuring switch for a subscriber connection can still be used. The measuring switch can be in the fire-proof housing of the telephone exchange built in and attached there next to the subscriber switches or in place step on one of the subscriber counters; it can also be in a special, separate from the housing of the telephone exchange attached, firedamp-proof housing.

An embodiment of the invention is shown on the basis of the drawing.

This shows a circuit diagram of the measuring switch and part of the circuit diagram of the telephone exchange, as far as it is necessary to understand the action of the measuring switch.

Each of three contact arms 57, 58, 59 and three contact groups with the. Contacts 9 to 20 existing subscriber switch 5 assumes in the position shown on contact 9 of its contact arms 57, 58, 59 its rest position, in which a call from the assigned subscriber is indicated by the signal device 7. The subscriber line core 68 a is connected to the contact 20 of the contact arm 57, and the subscriber line core 68 b is connected to the contact 20 of the contact arm 58. The operator sets the switch to contact 10 (answering position)

709 849/143

one if he wants to receive the wishes of the calling subscriber or if he wants to accept the caller to be connected Wants to call the participant. The following nine positions 11 to 19 are intended for the connecting lines, which are for the connection are available between the calling and the desired subscriber. A twelfth Position 20 of the subscriber switch is intended to switch the subscriber line in question from the Switch off the control center.

Nine connection lines are provided for the optional connection of the various subscriber switches 5 with one another provided, of which only three, namely 63, 64, 65 are shown in the drawing.

Connecting lines 64a and b 64 via the lines 151 and 152, respectively, the contact arms 128 c and 128 d, and the lines 142 and 143 via the relay 87 to the + - connected --Klemmen. This is also the case in the second and third rotary positions of the measuring switch "measure voltage" and "calibration", so that in these three rotary positions speech operation can continue unhindered on the connection line 64 intended for the test.

2. In the second rotary position ("measure voltage") the circuit is +, 134,128 b. Line 157, 128 a, volt ohmmeter 132, 133, 128 e, 135, made so that the volt ohmmeter 132 the voltage

Each connecting line consists of three individual 15 indication of the battery, which in this way lines α, b, c, of which the lines α and b can be monitored continuously or as required.

3. In the third rotary position of the dial ("calibration") the current runs through +, 134, 128 b, line 157, 128 a, volt ohmmeter 132, 133, 128 e, 158,

63 are connected to the contacts 11, while to the connecting line 64, the contacts 12 to which Connecting line 65 the three contacts 19 etc.

Spreebleitung and the line c a signal line
represent. Each connecting line 63, 64, 65 is each
a certain contact 11 to 19 of the three contact groups assigned, in such a way that 20 141, variable resistor 138, switch 137, -. By z. B. the three lines a, b, c of the connecting line corresponding setting of the variable resistor 138

the pointer of the measuring instrument can point to the zero point are calibrated so that any change in the

are closed. It can be seen that on 25 battery voltage is taken into account. set two subscriber switches 5 to the same 4. Now the insulation measurement for the

Contacts 11 to 19 establish the connection between the various subscriber lines Participants can be established. the. For this purpose, the relevant part

To carry out the insulation measurement and the receiver switch 5 on the test connection line 64, other checking of the system, a is set in its 30, ie on the contacts 12. If the measuring switch shown in the left part of the drawing is now switched to the fourth rotary position (down) a rotary measuring switch, which is made up of five contacts, then the following connection is established: -f-, groups 123, 124, 125, 126, 127 exists, each with 134, 128 b, line 154, 64 b, 88, contact arm 58, a contact arm 128 a to 128? work together. Subscriber line 68 b, subscriber line 68 a, Kon-These contact arms 128α to 128 e are attached to a contact arm 57 on contact 12, 89, 64a, 153, contact common axis 129, which also has the pointer arm 128 a, 132, 133, contact arm 128 e, 141, arm 131 carries, which stood in six different rotational positions 138,137. -. The ohmmeter 132 shows the Isodes switch can display. lation value of the two subscriber lines 68 a, 68 ?;

The contact arm 128 α for the contact group 123 against each other and the telephone set connected to this subscriber line is via a volt obmmeter 132 and a line 133 40. with the contact arm 128 ^ of the contact group 127 5. In the fifth turntable (aE) the Bat is connected. From the + terminal the line 134 leads on the one hand via +, 134, contact arm 128 b, to the contact arm 128 & the contact group 124, earth: on the other hand via switches 137, 138, 141, and from the terminal - the line 135 leads to the contact arm 128t ?, 133, 132, contact arm 128a, 153, the contact 136 of the contact group 127. The 45 64 a, 89, contact arm 57 on contact 12 at 68 a, so • terminal is via a circuit breaker 137 and one that here the insulation resistance the subscriber rheostat 138 is measured via the line 141 with the line 68 α to ground. Contact 139 of contact group 127 connected. 6. In the last rotary position of the measuring switch

To connect the test equipment to a be φ-Ε) , the battery is on the one hand over 134, 128 b, on the Hebige subscriber line one of the existing 50 earths becomes; on the other hand via 137, 138, 141, contact arm connecting lines, eg 64, are used. While 128 e, 133, 132, contact arm 128a, 159, 154, 64 b, 88

the connecting lines normally used,
z. B. 63, 65, are connected directly via a relay 87 to the + -, · - terminals, this connection is made in the test connection line 64 via the 55 measuring rotary switch. For this purpose the relay 87 is the one provided for the measurement test
Connecting line 64 via special lines 142,
143 with the contact arms: 128 c and 128 d of the third

Contact arm 58 to 12 to 68 b, ie the ohmmeter 132 indicates the insulation state of the subscriber line 68 & to earth.

The switch 137 is closed during the insulation measurement. The purpose of this switch is to measure the insulation turn off at will. If the switch 137 is in its open position by a Security key can be locked, this is a guarantee

The fourth and fourth contact group of the measuring switch gave 60 that the insulation measurement was only bound by one. On the other hand, there are contacts 147,148, specific persons appointed for this purpose, 149 of the third and fourth contact groups. As can be seen, the connection lines 15Ij 152 with the lines 64a and 64 & lines 142,143 are in the last three, the insulation connection, the positions of the measuring switch also assigned to measurement by lines 153, 154, the contacts 155,156 of the first and second contacts. 65 without connection to lines 64α and 64b , so clock group are connected. that the connection line 64 during the

In the six rotary positions of the measuring switch, set to »insulation measurement« to connect

There are now the following circuits: Participants cannot be used.

1. In the rest position (»Off«) these are volt-ohms. With the described device you cannot

meter 132 and the rheostat 138 de-energized. The 70 only those directly connected to the telephone exchange

closed subscriber lines, but rather also those of the sub-center, provided they are connected to the main center by a cross-connection are.

Claims (5)

Patent claims: 1. Circuit arrangement for manually operated fire-weather protected telephone exchanges, at the rotary switches assigned to the individual participants can be set to one of several all; Rotary switches accessible connecting lines are adjustable, characterized that one (64) of the connecting lines (61 to 65) accessible to all rotary switches a known per se: test device for the subscriber lines is connected. 2. Schaltungsano'rdming according to claim 1, characterized in that a measuring switch (131) belonging to the test device and provided with five contact arms (128) and five contact groups is successively in different positions ("off", "check battery voltage", "calibrate chisel instrument") , "Insulation test between the two subscriber lines", "Insulation test between earth and one or the other subscriber line") can be set. 3. Circuit arrangement according to claim 2, characterized in that in one position (139) of the measuring switch (131) a measuring instrument (132) for calibration in series with a rain resistor (138) is connected to the existing central battery. 4. Circuit arrangement according to one of claims 1 to 3, characterized in that the for · connecting the test device to. the subscriber rotary switch used connecting line (64) in certain, z. B. in the first three positions of the measuring switch (131) can continue to be used for a subscriber connection. 5. Circuit arrangement according to one of claims 1 to 4, characterized in that a switch (137) is arranged in the circuit for the insulation measurement, which switch can be locked in the open position by means of a safety key. Considered publications:
German Patent Nos. 863 957, 303 176;
Goetsch: "Pocket book for telecommunications technicians", 1953, 3rd part, pp. 313, 314, 561 to 564. 1 sheet of drawings © 709 849/143 1.58