SU129676A1 - Intrinsically Safe Telephone Communication Device - Google Patents

Description

In coal mines of industry, for production and dispatching telephone communications, a mine telephone system is used for introducing a local battery system (MB) in explosion-proof and in service. which does not satisfy the security requirements. The need to turn off (de-energize) the telephone communication system, equipped with such equipment, if methane concentration in the mine exceeds 2%, causes great operational inconvenience and makes the dispatching control of production processes in gas or dust mines unreliable. When methane appears in the mine over 2%, i.e., in emergency mode, a special communication is needed for operational guidance on rescuing people, an explosion-proof telephone must be turned off, the mine is left without operational telephone communication The drawbacks of telephone equipment in the explosion-proof version of the system (large arrays of weight, use of dry elements as a power source, water-permeable design, etc.) complicate and worsen the operation of the connection. th s telephone apnaratur ispolnen1 explosion-proof and requires the use of expensive ii1H armored telephone cable.

An intrinsically safe telephone communication of CBs is proposed, which makes it possible to use telephone sets of the CB system having a weight 9-10 times less than the explosion-proof ones. and enabling us to provide electrical monitoring of the state of 1 telephony telephony cables, automatically sending a call to the station.

The main feature of the proposed system of spark-proof telephone communication of the Central Bank, which makes it possible to use it in gas-hazardous mines, is the presence of a switch-on parallel to the calling circuit through the plug-in contacts of a potentiometer, 1-pole as a gas discharge device. Kpainnie electrons, no. 129676 - 2 swarm 1K) of 10 hours to a ringing device (transformer or inductor), and a subscriber line is connected to the middle and to one of the indicated extreme electrodes. In order to reduce the magnitude of the short-circuit current in the IITANI circuit. The central battery is located in the proposed telephone communication system on the surface of the shaft and connects to the mine station in the mine, installed in the mine, by a two-wire line, the co-distributed of which limits the short-circuit current to the maximum magnitude. A neon lamp is used to control the call to the abopepta, ensuring the intrinsic safety of the circuits and the exclusion of the call control devices, have both inductance and sparkless parameters.

FIG. I presents a general block diagram of the proposed system by an intrinsically safe telephone link of the central bank; in fig. 2- irincinnial regimen of inclusion of ringing devices.

The composition of the proposed spark-ignition telephone system of the Central Bank includes: obi1; 4 and telephones 5. (An open-source monitor switch 4 and telephoto devices 5 receive a mithiah from the battery battery braking 6 and the remote station located on the surface of the mine, along with a pair of telephone cable 7 lived. Taka The power supply system provides sparkless protection in operating and emergency modes as a result of the distributed activation of the system.

The remaining banks of the telephone cables (call centers), the telephone lines and the ion-imitating lines) also pass through 2 firewalls installed on the station.

The presence of call chains in the proposed network system is described by the following measures; The calling devices --- the inductor 8 and the secondary winding of the calling transformer 9 have a higher distributed resistance, which is able to reduce the short-circuit current to the electrical resistance. For quenching: kstratokov razmykain in vyzyvsh x chains to iskrobezoiasnoy magnitude with odnovremeppoy stabilizatspey Pairi output voltage Ua across the ringer nriborov shtetsseliye contacts included tsotentsiomstr as trehelektrodiogo gazonaiolnsnnogo device (VR) 10, the middle and one outer electrode which is attached aboieitska lines. The device 10 is indicative of the inertia-free and disabling of the call to the liai when it is in power (network destruction or gas loss) or disconnected.

In addition, on the common telephone station / cable switch, 2 times () of the lines installed, connected in line in parallel through the plug contacts of the arresters //. The same bit 12 is included at the input of telephone calls.

In order to provide intrinsically safe control of the call circuits in the zrimenep system, a non-inductive circuit consisting of a neon lamp 13 and an additional resistance 14 and switched on in parallel with a ringing device. In the absence of a call, the neon lamp shines with a normal candle. When a call is sent to the subscriber (when the ring key is set to the call position) and the parallel call, the load is connected to the subscriber’s telephone line and telephone number. Due to this, due to the reduction of the voltage supplied to the neon lamia 13, to a value below its ignition potential, the luminescence of the lamp is reduced. If a subscriber is broken on the subscriber’s line, then when calling, its section

The neon lamp will not be G1rec1). This achieves a sigia.igigl and circuit malfunction.

In calling the phone, there are no open and normal contacts.

The calling device of the ainarata - call 15 is permanently connected to the line, however, the calling current arriving at the annarat is passing into the conversational circuit. The talk currents pass through the winding of the zvoyik, since the latter represents a large inductive resistance for these currents (circuit with electrical section 1 of the circuits, which is preferably 16 k and capacitors).

The intrinsic safety of the electrical circuits of the conversational tract and the call of the station is determined by the irimeration of inductances and capacitance of numerical values in combination with gas and gas discharge dp1p ami // p 12.

.Iearate allows you to monitor the operation of mechanisms by listening to the dispatcher of ipJyMOB and receiving pkmo loudspeaker and dialing a call without removing the handset micro telephony.

 the specified pelp when the microtelephone tube is hung, the contact springs of the lever switch 18, open the switch | ) Pull the circuit, nguptiruyutsya with a co-capacitor P of small capacity, which ensures that the SOUND frequency current passes through the line and is blocked by iixTi. for constant and B1) 1 calling currents.

Prevention and c on b ji with t with and

Claims (3)

1. The security of the telephone communication of the Central Bank. state and 1 and. telephones (| l), batteries, and telephone cables. about t; i p h. 10 {{e with so that, in order to ensure security in the Iax, there is a certain concentration of gas, into the chain Ia | , 1alls lion through plug contacts included a tag meter. Vypo; peppy in gazoruprgdiy device. Kpaiinne electrodes are koto) og () n () ak, tk) to the ringing device (transformer or injector), and to the middle and to one of the indicated edge electrodes of the subscriber line irisodedienne. 2. Telephone device according to p. 1. About tl and h and I1, e i with that. that, in order to reduce the short-circuit current value in the battery, ceit1) the alia battery is located on noBejixnocTH nc zapa with instance 1) by the switch with wires, the distributed resistance KOTOpi.ix limits the short circuit current to a safe value. 3. Application in device 1 p. 1 to control the parcel of you: ish of a neon lamp, which is switched on in the hallway. Priority on GP1. 2 and 3 - from 12 October 1955 i. DJ FIG I about- LvWAAA-i vVv AAA / W A- 17 FIG. 2