SU731511A1 - Device for current leakage protection in electric locomotive rolling-back system contact circuit - Google Patents

Description

the output of the master oscillator is connected via successively connected delnators and a former for transmitting the control pulses to the input of the delay element n to the first input of the logic element I, the output of which is connected to the control input of the key; The jerk of the supervising norm element is connected to the first input of the follow-up analysis unit, the second input of which is connected to the output of the el delay time, and the third input - with the output of the on-demand disconnecting norm element, the output of the sequential analysis unit is connected to the third input of the OR-NOT logic element, and the last output is connected to the second input of the AND logic element, so that in case of time separation of signals, the output of the master oscillator is connected to the input of the operating signal source snc.

FIG. 1 given a block diagram of the device; in fig. 2 graphically depicts impulse diagrams for device nodes.

The device contains a power supply source 1 with a switch, an operational signal source 2 (an on-line generator for frequency-division devices or a modulator-interrupter for devices for time-separated leakage and operating current signals), measuring element 3, leakage signal extraction unit 4 , an inertial tripping threshold element 5, a non-controlling monitoring threshold element 6, a sequential analog block 7, a logical element 8 OR NONE specifying an oscillator 9 (clocking device node with time divided signals), frequency divider 10, shaper 11 control pulse duration, delay element 12, logic element 13 AND, switch 14, control leakage resistor 15, polisher 16 load value, inputs (input signals) of element 7: (A) - “norm, (B) -“ tact and (C) - “reset-ban; / n - control leakage current. I, I, Poison, I4, I, Yaya and I are the signals at the outputs of the elements (blocks) 11, 4, 6, 12, 5, 7 and 8.

In the well-known devices of the source 2 operational system, the measuring element 3 is included nln into the dissection of the contact network (РКС-1, Dnepr), or between the contact network on rails (RUKS, UZO). To the output of the measuring element and to the switching output of source 2, in all known devices, a contact (electromagnetic relay) or a non-contact inertial tripping threshold element 5 is connected through the leakage signal extraction unit 4, acting through the control input to the power supply source switch 1 of the power supply. The operability of the device is usually checked by the electrician on duty once per shift by briefly closing the key 14 in the control leakage resistor circuit, which, with good equipment, leads to trial disconnection of the network from the source 1kA of the power nitann.

The barrier disconnecting elements are made inertial, with a time delay tc to trigger, which contributes to the increase in noise immunity of the protection systems (in the AChZ-10-275 equipment Dnepr, this shutter speed is 0.15 s). It is established that the time delay for triggering at one and the same level of leakage at element 5 - / s is longer than that of element 6 - / s, and the duration of control pulses to is sufficient for the element of the clamping apparatus to respond to element 6.

The periodic signal received in the normal mode of operation of the equipment from the output of the driver 11 through the logic element And 13, causes the closure of Repstore 15 key 14 to the network and the creation of leakage impulses / n with duration k.

If the source of operational signal 2 and the measuring circuit elements are intact - block 3 and 4 (where the main component diagram of the device circuit is concentrated), then output b. 1: 4 will have the level of the leak signal U4 equal to the nominal one - see FIG. 2. After time

;, - four.

-four,

where A / U is the signal leakage delay in blocks 3 and 4; after the appearance of the control pulse, element 6 is triggered, but simultaneously the signal at the output of the delay element 12 is activated. Since the non-triggered cut-off threshold element 5 does not work at the same time, there are signals at the inputs (A) and (B) of the block and sequential analysis 7, but not at the input C. According to the logical condition / 1Л5ЛС, the block 7 fixes a positive result of a single check of the equipment for serviceability (with the exception of elements 5, 8 of the additional circuit of block 1).

Any failure of blocks 2, 3 and 4 of the annotation leads to the fact that the energy of the control signal leaking at the input of element 6 will be better than a single-stroke, it will not work at this time, and according to the logical condition LLbLS unit 7 fixes a negative result of a single health check. Sequential analysis element 7 enhances the reliability of the equipment under the influence of interference. If we refer to recommendations from the field of telemechanics, we can assume that the instrumentation is intact, if out of 4 consecutive checks a positive result is recorded at least 3 times (see.; The test cycle in Fig. 2). Otherwise (see “f + 1 test cycle”), block 7 issues an OR through the OR.-NOT 8 element to disconnect the source 1 of the power network intaia and, if necessary, send a signal to the dispatcher. When a disconnect leak occurs in the network, element 5, element OR-NO 8 is triggered, and power supply 1 is disconnected; in addition, the signal at input C sets block 7 to its initial state and prohibits its further operation until such time as the interrupting leakage does not disappear. Finally, when the power supply of the mains power supply source 1 is disconnected, iodine to the key 14 is stopped, since the input of the AND 13 element, associated with the output of the ORID 8 element, does not have a signal.

In conclusion, we note that in known protection devices, such as RUKS and Dnepr, there is a channel for controlling the level of operational voltage, which is implemented as a relay that has opening contacts in control of the switch of the power supply source 1.

This channel operates in parallel with the disconnecting, which allows axis-bonded reduction of their interaction to the logical addition of signals at the first input of element 8, associated with the coitrol output of block 2, and the signal of the second input connected to the output of element 5.

The bed-laying device is made in the form of an additional depressive node of the AChZ-10-275 equipment, developed by the Dnepropetrovsk Mining Institute and produced by the Dneprovsky engineering plant.

The results of the laboratory tests of the device showed its performance and a significant increase in the reliability of the protection equipment (the control loop covers blocks containing 95% of all elements of the AChZ station set).

Claims (3)

1. Device for protection against leakage of current in the contact network of an electric locomotive haulage, containing the master oscillator, the source of the operational signal, connected in series with the measuring element in the control circuit of the operational current. block selection b. Leakage, the first input of which is connected to the output of the measuring element, the second input - to the switching output of the operational signal source, and the output - to the input of the inertial tripping threshold element connected to the first input of the logical element OR NOT, the second input of which is connected to the control output of the source operating signal, and the output is connected to the power supply input of the mains power supply with a switch, and subsequently connected a switch and a resistor of the control leakage, included between the protected network and the ground, and the barriers in the load chains, characterized in that, in order to improve reliability and ensure automatic control of the device, a frequency divider, a shaper of control pulses, a delay element, a logic element And, an inertial control The threshold element and the unit of sequential analysis, which assumes the output of the master oscillator is connected through a successively connected frequency divider and a duration controller control emulses to the input of the delay element and to the first input of the logic element AND, the output of which is connected with the gain input of the key, the input of the inertial monitoring threshold element is connected to the output of the signal extraction unit leakage, and the output of the controlling threshold threshold element to the first input of the sequential analysis unit, the second input of which is connected to the output of the delay element, and the third the input is with the output of the inertial tripping norm element, the output of the sequential analysis block is connected to the third input of the logical element OR NOT, and the output of the latter is connected to the second input of the logic element I. 2. The device according to claim 1, characterized in that, in order to be able to use it in time-separation signals, the output of the master oscillator is connected to the input of the synchronized signal of the operational signal. Sources of information taken into consideration 1. USSR author's certificate L (Ü 111833, class N 02N 7/26, 1959). 2. USSR author's certificate number 373812, cl. H 02 H 3/16, 1970. 3. Authors certificate of the USSR LGO 127693, cl. H 02 H 5/12, 1959.