SU370691A1 - UESECUTION i - Google Patents

Description

DEVICE FOR SELECTIVE ALARMING SIGNALS ON

one

This invention relates to devices for signaling earth faults.

The known device, which contains a triggering organ connected to the zero-sequence voltage, a zero-sequence current transformer and a rectifying bridge, connected to a1M1Lithuite discriminators on the solar panels with a rectangular netley hysteresis, with write and erase windings, to the iKpTOpo o through the long-time element is switched on by light-ing in. Dicator-thyratron, does not have high noise immunity.

In the proposed device for improving noise immunity, the amplitude discriminator is additionally equipped with a capacitor to which the erase and parallel windings of the recording winding are connected in series, and to increase the noise immunity of the thyratron and eliminate spurious ignition, a key is connected to its anode circuit and through the active capacitive circuit - a relay winding disconnecting the contact of which is connected in parallel to the anode resistor, and the closure through the actively capacitive circuit to the cathode of the thyratron.

The drawing is a schematic diagram of the device.

The device consists of the same type of cells.

the number of which is equal to the number of zachischimyh l), and the main unit.

Measuring elements include a deligel /, straightened bridge .2, core

with a holuresis circular loop with record 4 windings, prohibition 5, read 6, output winding 7 and diode 8 in the communication circuit with long-term memory elements. Consistently connected reading windings

6 form: the read circuit, and subsequently the connected windings of the prohibition 5 is the value of the prohibition. The value of the prohibition includes the following .1but-in relation to the value of the record. A collection of rectification bridges

2, the write and inhibit circuits, the blocking capacitor 9, and the discharge resistance Yu form the a-matrix discriminator. Record windings 4 through rectifier bridges 2 are connected to secondary windings

zero sequence current transformers //.

Long-term memory elements include a core 12 of a material with a rectangular hysteresis loop with windings.

records 13, prohibition M, reads 15 and output winding 16. As in the measuring elements, series-connected Winding reads 15 form a reading circuit, and series-connected prohibition windings 14 form a prohibition chain. Chain of prohibition

i; KJioi ;; ieTc / i last-minute meeting on iioiiiciuiio ji chain of episodes.

/.InyxiicxiiiniioanbiH switch / 7 with contacts J8, 19 serves to change the mode M; I work elements of the long-term piece.

The combination of the output winding 7 core; 3, date 8, record winding. 13, the escapillator 10 20 p of the output winding 7 of the compensating core 21 forms a chain of st - 10 sm between the measuring elements and the elements of the long-term memory. When the lock is coit. 18 switch 17, the prohibition circuit is also included in the target (windings 14} .15

As signal elements, cold cathode 22 thyratrons are used. The signal elements also include resistances 23, 24, which determine the magnitude of the preparation current and the anode current, respectively, and the isolation capacitor 25.

The starting element consists of a relay 26 with contacts 27-30 of the rectifying bridge 31, a capacitor 32 with a discharge resistance of 33 and a bottom of 34.25

The device is powered from an AC voltage of 220s through a power supply unit, including a power transformer 35, a toggle switch 36 with contacts 37, 38, a P1tel fuse 39, a warning lamp 40, 0 capacitor 41, 1 p m bridge 42, smoothing capacitor 43 and read capacitors 44, 45 with charge resistors of -16,47. divided into diodes 48, 49.35

The circuit is composed of a relay 50 with contacts 51, .52, connected through a capacitor 53 with a discharge resistance of 54, a general anode resistance 55 and an active capacitance circuit 56, .57. Coating relay n1u1G1iroBana diode 58.

Control elements include: 5.9 key transfer of anode power supply with 60-volt contacts :.), two-way switch 17, interrogation key 64 with contacts 65, 66 and set button 5 67.

The donor-flame elements are the cores 21, 68 to compensate for the irregularity of the hysteresis loop with read windings 6, 15 and output windings 7, 16, respectively, resistance 69, 70 in read prices and diode 7 /.

In the normal mode, all the cores of the 3 measuring elements are in the O position, or one of them is in the position (and 1, the others are in the O position. The last ray can be on board when I cast in any one of the core 3 from the throw. zero sequence, l (e caused by ground flushing. (for example, comoagitational and, therefore, -11whee 1NI1MI in sets, external inter- nal short circuits in t. d.); only in the hellish cores 3, the TUCK “her zanpsi in one of the heartbells is simultaneously concurrent; us: m; 65

- erasing it from any other core due to the prohibition chain

When an earth fault occurs due to voltages occurring on the secondary windings of zero-sequence current transformers in a transient mode, currents flow through the windings 4 and the prohibition circuit of the measuring elements.

When the first cell is connected to the damaged connection and the rest to the intact number of turns of the record 4 winding (W is selected from the conditions).

Considering that the windings 4 to 5 are included in series-counter, ppm, attached to the core of the divider /,

 F, (, - W-, - W W, (2i, ± i),

where n is the number of connections,

{is the current in the circuit of the recording winding 4. M. ds, trilazhein to the heart of the {ICU,

F,: W, (2i, ri}. 1

It is known that with. the short circuit of the phase to earth, the primary) 1Y current at the fault location is determined by the total capacitive current of the network / c. the primary current in the intact cable is its own capacitive current / s. As a rule, therefore, and /,. As the blocking capacitor charges, the rectifying masts 2. the intact connections will be locked, and p. Ft, p | rilazhe1nna to the serial number 3 of the first cell, will be the Bulletin O, and M.d. pp., gfilozhenna to each of the other hearts, will remain negative. In the limiting case, when. All bridges are not 1e bridges, except for the current ni x current il, will be locked with a capacitor 9,

F, .W, (2i, -i,) V, i,

F,: .. W, (,) - W, i ,.

Under the action of m. D. F divider / non-magnetic core in the positive direction (from position O to position I). Each of the remaining 1) 1x cores of the node is valid demagpichnvayupdey m. FK is either retained in the O position, or, if the heart is recorded as false from interference, but there is an erasure from it. At the end of the recording process, only the first cell core will be in position I. The capacitor 9 is charged in the limit to the amplitude of the voltage on the secondary winding of the current transformer zero. consecutively interconnection, blocks all recording circuits and thus prevents the amplitude discriminator from working improperly during the next moments of time when due to the divergence of the transient current frequencies in individual cables or due to saturation. TTPC cores (zero-sequence current transformer) The instantaneous values of the voltages on the TTPC secondary winding of any intact cable may be larger than the damaged one. Since the recording of all new information is accompanied by the simultaneous automatic erasure of any previous format information, the amplitude discriminator ensures the correct selection of the largest signal in any half-period, i.e., its operation does not depend on the frequencies and phases of transient currents in individual cables.

Resistance 10 provides a discharge of the blocking capacitor, returning the circuit with the specified time to its initial state.

After recording, the triggering body triggers (relay 26's own response time is longer than information recording time, not exceeding several tens of microseconds, turned on for the zero sequence sequence Sf / o- Relay 26 opens contact 28, disconnecting the recording winding 4 from, and closes first contact 30, and customer contact 29, which is ensured by appropriate adjustment of the contacts. Contact 27 provides a signal to the central alarm circuit. The reading capacitor is discharged through the contacts 29, diode 7 /, resistance 70 and about the winding of the 6th reading circuit, re-magnetizing the core 3 of the first cell in the negative direction (sch1gg1.1v; nn11). The core 21, which is similar to the core, is made from a material with a rectangular loop of t-rezis, designed for co. Sensing interference from the IHp of the hys- teresis of the hysteresis loop. For this, ei: o high winding 7 is included successively high winding 7, cores 3, and read 6 windings are consistent with the winding; 6} of the indicated cores.

When read on the output winding 7 of the core 3, the splitter 1 but is. .nulse nahr, oseprovozhayuschy zanl / n core / 2 - the corresponding element is long-term; oh memory.

Long-term memory elements can operate in a single-user mode of two modes.

 Sang dpu.khnosiiionyy switch; 1 17 is in the position indicated on the drawing (.nut (Contact J8, spread. Contact 19), then ps) followed by a meeting with the windings of the record 13 includes a prohibition circuit. At the same time, the process of sealing - erasing into the cores of the Jlementa of the long-term memory turns out to be anaJHjrHHHM proprice recording - erasing the measuring elements into the cores of the RAM, taking into account that the communication chain is not needed in the blocking circuit of the satellite. Consequently, in this case, the recording of new information from the maintenance is given by erasing all previous ones. In this mode, only the last damage is recorded in the non-volatile memory elements, and the information about the previous damage is lost when each subsequent event occurs.

If the switch 17 is in the second position (the inhibit circuit is output), then these long-term memory memory work

in a mode that allows long-term storage of information about all successively short-circuits on. the earth. At. This record I in any core 12 elements of long-term memory

5 is not accompanied by erasing information from another heart.

The reading of information from eleme.meitov is a long-term one; to us, we (survey) are given hands .0 by pressing the button "Poll.

0 Before polling, contact 60 of the anode feed key 59 is energized on a; - thyratron odes. In order to exclude the ignition of tiratrons, it is necessary to ensure the float: the first increase in voltage

5 in nromezutke anode-cathode. For this is the confirmation circuit. At the first moment after the closure of the contacts 60, some thyratrons may be briefly ignited. After (Some time / Wed triggered

0 relay 50, contact 5 / opens and contact 52 closes. In this case, the anodic voltage on the thyratrons drops to O, the thyratrons igniting at the first moment go out, and then the voltage gradually increases over the

5 Constants of Constant R5aC5s- The absence of anode voltage in the normal mode eliminates the possibility of false ignition of interference from tiratrons.

With key 6} key 5..9 is being prepared

0 interrogation circuit, and contact 63 opens the recording circuit. Measuring | .chch elements. At the same time, contact 62 sends a signal to the display “BLI | Nker not lifted.

When the button “Interrogation is opened, contact 66 in the communication circuit prevents the transfer of the reverse information; 1I to the cores of the RAM. Contact 65 winding reading 5 is connected to a capacitor 44. The discharge to the ondensagorama causes the corresponding magnetic field to be re-magnetized by the H1 core (one or several, depending on; voltage pulse causing the corresponding type of Tpofia ignition.

Core 68 with read windings; / 5 and the output winding 16 is designed to compensate for the non-direct mode.: 1 loop stitches 60 rezis, for what / 5 cores 12 ...