SU1252201A1 - Device for ensuring electric safety in work on contact system - Google Patents

Description

The invention relates to electrofusion, namely to protective means when working on electric transmission lines, and is intended to control safety when operating, for example, on a contact network, electrically same. Single expensive1

The purpose of the invention is the increase in the reliability of the contact of the grounding elements of the contact network.

FIG. 1 shows a schematic diagram of the safety of work on the contact network; in fig. 2 - electrical function. 1n the device diagram.

The device for ensuring electrical safety during the performance of work on the contact network contains a separating transformer 1. The secondary winding of which is included in one of the grounding elements 2 connecting the contact network 3 and phase 4, and the primary winding is connected to the source 5 of the operative current, threshold element 6, alarm element 7, magnetic field sensor 8, 9 SI1 amplifier, NALA, amplitude detector 10, two elements II and 12 time, memory element 1.3, audio indicator 14, element OR NOT 15, indicator 16 time generator 17 ta ct impulses and key 18.

The device works as follows. Before going out to work on the line, the device elements 11-13 are set to their original (zero) state by briefly turning off the pigment or by applying the appropriate signals; 1ov to the installed R inputs. At the work site after receiving permission from the energy dispatcher to perform the work (applied to the contact network disabled) the work supervisor, who has the receiving part of the device (elements 8 -18), closes the control cabinet 18, as a result of which, on the second) progress of the element OR HH 15 and at the input R of the generator 17 clock pulses were set The level of logical zero and pulses (for example, mi) (utc pulses) from generator 17 begin to flow to the counting inputs of time elements 11 and 12, performed, for example, in the form of conventional pulse counters on counting / C-flip-flops or on dedicated LSI for timers . Entry 12 thus captures the snoring time from the beginning, 1a of the work, which is displayed on the indicator 16 (for example, IZHKI 1-4 / 8).

Since the sensor 8 is missing a signal. 1, then at the input R of lepsoro element 11, the logical level “O” is maintained, and it also considers the time from the start of work.

Since there are logical "O" at both inputs of the OR HF: 15 element, there is "1 at its output, and the audible indicator 14 is turned on. Then the fitters of the contact network hang the ground along the boundaries of the work area to the contact network 3; 1 (rods), one of which is equipped with a source of 5 operational

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The output of which is connected to the primary winding of the transformer 1, the secondary winding of which is the metal pipe ta (eat; 1 of the connecting element 2, on which the transformer’s conductor Miji is attached. With reliable contacts of the grounding elements 2 with the rail 4 and to the (contactless) by network (3), operational GOK L.1I, which generates near the circuit, i.e. within the work area, induces a magnetic field inducing a signal amplified by amplifier 9, which is detected by the detector I) and enters the threshold ale input nta 6. When the work manager (with the receiving part of the device) is located near the work area, as required by the safety regulations, the signal level of the cell exceeds the response threshold of element 6, the logical “1” appears at its output, as a result of which .1 The sound imbalance 14 is disconnected and time element 11 is reset to zero. If the time required to hang elements 2 exceeds the allowable time element 1 1, the conversion factor of which is chosen appropriately, overflows and its output translates element 13 for example, on the / 5-flip-flop, into a single state, as a result of which the element 7 of the sys- tem triggers (the LED (ha) lights up, fixing an unacceptable violation of the work technology. The reset of the element 13 is possible only simultaneously with the element 12 of the time that the lawsuit; | yuchaet the reset of the fixation of the shadow |

At the end of the work after removing the elements 2, the work manager opens to.: 1uch 18 and reports this to the dispatcher. At the same time, the input level Rg of the generator 17 and the second input of the element OR - NOT 15 notify the logical level “I, which blocks the operation of the generator 17 and the sound indicator () 14). Thus, the time indicator 16 displays the production time work, which is then compared with the data of the energy dispatcher.

If during the production of work the manager leaves the work area, then the signal at the input of the threshold element 6 becomes less than the trigger threshold, at the output of the threshold element 6 the lo-1O appears, in this case. Sound indicator 14 is activated and element 14 begins to work. If the work supervisor does not return to the work area within the time determined by e. With item 11, the last one fails and translates element 13 into one state, which element 7 indicates.

.L11alogichnom way the device works and if the contact of any of the elements 2 with the contact network 3 or rail 4.

Thus, the device controls the availability and quality of the two-way grounding of the contact network 3 at the site

works, as well as the observance of safe technology works, which increases the level of electrical safety when working on the contact network of electrified railways.

o-Editor I. Nikolaichuk Order 4577/20

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Filial PPP sPatent, Uzhgorod, st. Project, 4

Compiled by V. Kochetkov

Tehred I. VeresKorrektor M, Samborska

Circulation 647Signature

Claims (1)

DEVICE FOR ENSURING ELECTRICAL SAFETY AT WORK ON THE CONTACT NETWORK, containing an isolation transformer, the secondary winding of which is included in one of the two elements of the contact network with the rails, and the primary is connected to a non-industrial frequency current source, the threshold element associated with the light signaling element, which differs that, in order to increase reliability, it is equipped with a magnetic field sensor, an amplifier, an amplitude detector, two electric elements connected in series time elements, a memory element, an OR-NOT element and an audio indicator at its output, an indicator of the time of work, a clock generator and a key element connected to its input, the output of which is connected to one input of an OR element - NOT, while the output of the clock generator is connected with one inputs of one and the other time elements, the output of the last of which through a memory element is connected to the light signaling element, and the output of the amplitude detector through a threshold <gth element is connected to other inputs of the first time element and the OR element are NOT, and the output of the second time element is connected to the work time indicator. Figure 1 SU .... 1252201