SU883515A2 - Spark-proof remote power supply system - Google Patents

Description

The invention relates to remote power systems designed for the safe transmission of electrical energy from a power source to a load in enterprises with explosive atmospheres. ⁵

According to the main author. St. No. 675194, there is a known system comprising a power supply with an intrinsic protection block made on a dynamic spark protection element with a discharge start sensor, a cable line, communications with shunts dividing it into sections and made in the form of diode bridges, the inputs of which are connected to the output terminals of the sections, and the outputs to the input terminals of the sections £ 1].

In the known system during the appearance * Discharge Research Institute at non-branched BIDDERS _m ke link falls into the category of only a fraction of the link portion unbranched energy. The remaining sections (branches) turn out to be connected to the emergency section via on-board diodes of bridge shunts.

Thus, the discharge of distributed capacities of branches from each other and to the branched section of the communication line is eliminated.

However, during short circuits in the branch, the energy of the distributed capacitance of this branch and the unbranched section of the communication line enters the discharge. This does not allow to further increase the intrinsically safe power of the remote power supply by increasing the supply voltage.

The purpose of the invention is to increase the intrinsic, intrinsically safe power of the remote power supply by increasing the supply voltage by eliminating the input of an unbranched section into the energy discharge.

This goal is achieved by the fact that in the intrinsically safe remote power supply system, each shunt: is equipped with additional protection modules and is883515 made on a dynamic element of spark protection with a discharge start sensor, and dynamic spark protection elements are connected in parallel with the outputs of the corresponding shunts.

The drawing shows a diagram of an intrinsically safe remote power system.

The system consists of a power source I, an intrinsic protection unit, performed on the dynamic element 2 of intrinsic protection with a sensor 3 for the beginning of discharge, a cable communication line including sections 4-6 separated by shunts made in the form of diode bridges 7, the outputs of which are connected to the output terminals sections 4, and the conclusions to the input terminals of section 5 (6) of additional spark protection units, each of which is made on a dynamic spark protection element 8 with a discharge start sensor 9, and the dynamic spark protection element 8 is connected parallel to the shunt output 7, and the discharge start sensor 9 is included in the power supply circuit of the load 10.

When transferring energy from a .1 power source to loads 10 in nominal mode, energy is stored in sections 4-6 capacities.

When a short circuit occurs in the discharge section 4, the discharge start sensor 3 generates a control signal including a dynamic spark protection element 2.

The latter isolates the circuit with the discharge from the power supply 1. The energy stored in the distributed capacities of the sections / branches / 5 and 6 does not enter section 4, since the discharge of these distributed capacities prevents the on-board bridge diodes 7.

When a short circuit discharge occurs in one of the branches, for example, in section 5, the sensor 9 for starting the discharge of this section generates a control signal including a dynamic spark protection element 8. The latter isolates the circuit with the discharge from the energy of section 4, i.e. with a short circuit in the branch, the energy of the distributed capacity of the unbranched section of the communication line 10 does not enter the discharge.

Thus, during a short circuit in any section, the energy of the distributed capacity of not the entire communication line, but only the section in which the discharge occurred, 15 enters the discharge.

This allows you to further increase the intrinsically safe power of the remote power supply by increasing the supply voltage.

2Q The operability of the proposed system was tested in laboratory conditions as part of the OAST general shaft telemechanics system.

Claims (1)

The invention relates to remote power supply systems intended for the safe transfer of electrical energy from a power source to a load on an enterprise with an explosive atmosphere. According to the main author. St. No. 675194, a known system comprising a power supply with an spark protection unit, executed on a dynamic spark protection element with a discharge start sensor, a cable line, connected to shunts that divide it into sections and made in the form of diode bridges, whose inputs are connected to the output Section outputs and outputs to input pins of sections lJ. In a known system, when a discharge research institute occurs in an unramified portion of the communication line, only the fraction of the energy of the unbranched portion of the communication line is included in the discharge. The remaining sections (branching) are connected to the emergency section via counter-enabled diodes of bridge shunts. Thus, the discharge of the distributed branches capacitances from each other and to the branched section of the communication line is excluded. However, during short circuits in the branch, the energy of the distributed capacitance of this branch and the unbranched section of the communication line enters the discharge. This does not further increase the intrinsically safe power of the remote power supply by increasing the supply voltage. The purpose of the invention is to increase the intrinsically safe power of the remote power supply by increasing the supply voltage by eliminating the input to the discharge of the non-branched area. This goal is achieved by the fact that in an intrinsically safe remote power supply system each shunt is equipped with additional power protection units made on the dynamic spark protection unit with a start-of-discharge sensor, with the dynamic spark protection elements connected in parallel with the outputs of the corresponding shunts. The drawing shows an intrinsically safe remote power supply system. The system consists of a power supply source 1., an spark protection unit, performed on a dynamic spark protection element 2 with a discharge start sensor 3, a cable communication line including sections 4-6, separated by shunts, made in the form of diode bridges 7, whose codes are connected to output pins of section 4, and pins to the input ports of section 5 (6 additional spark protection units, each of which is filled on the dynamic element 8 of the spark protection with the transmitter 9 at the beginning of the discharge, the dynamic element 8 of the protection being connected parallel to the output 7, and the start of discharge sensor 9 is connected to the load supply circuit 10. When energy is transferred from the power source .1 to the loads 10 in nominal mode, the capacitors of sections 4-6 accumulate energy. When a discharge occurs in section 4, a short circuit the start sensor 3 produces a control signal that includes a dynamic spark protection element 2. The latter isolates the circuit with the discharge HOUSE from the power source 1. The energy stored in the distributed capacitances of the sections / branches / 5 and 6 does not flow into section 4, since d of these distributed capaciously Tei prevents counter included bridge diodes 7. In the event of discharge short circuit in one of the branching .4. Research institutes, for example in section 5, the sensor 9 of the beginning of the discharge of this section generates a control signal including a dynamic spark protection element 8. The latter isolates the circuit with a discharge from the energy of section 4, i.e. in case of a short circuit in the branch, the energy of the distributed capacitance of the unbranched portion of the communication line does not flow into the discharge. Thus, when a short circuit occurs in any section, the energy of the distributed capacitance of not the entire communication line enters the discharge, but only the section in which the discharge occurs. This makes it possible to further increase the intrinsically safe power of the remote power supply by increasing the supply voltage. The performance of the proposed system has been tested in laboratory conditions as part of the overall telemetry system ODST. The invention is intrinsically safe remote power supply system by author. St. No. 675194, characterized in that, in order to increase the intrinsically safe power of the remote power by eliminating the energy of the unbranched portion of the communication line, each shunt is equipped with an additional spark protection unit made on the dynamic element of the spark protection with the discharge start sensor, and dynamic spark protection elements are connected in parallel with the outputs of the corresponding shunts. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 675194, cl. E 21 F 17/06, 1976. VD -about: