SU1757011A2 - Device for protection against overvoltage in network with compensated neutral - Google Patents

Abstract

Cvtj and bretrni with iicfr omuic in the form of the zivistic manifestation / süchm of the horn of the mountain of the arc of the arc reveal f (xt of the steady burning of the arc of the poi f and I connect the resistance on the Prudential Fashb Zzu Chulyu L core zgogo, PCM I SIHOO in parallel with the arc g n.11 reactor, which leads to 40 1Gr1111nogo active on the current position of the G-section. al uvs a it-nnn selektW hOCfV p G CHNog1 EYASHCHIGY 1 3 AND f ly, 2 I L

Description

The invention of strings is invented, electrical equipment between the two countries should be used in a total of 6-35 t1 B with a compensated neutral for increasing and operating efficiency and selec- tion from the ground fault circuit and the device as. ce N 1

It is well known that a coil of a paraglider is parapassed in a circuit consisting of a connected resistor and an Omistor and a switch control unit, a threshold unit, and a selector for selecting the damaged phase. This resistance is included in the switch. (If the perpendicular phase is greater than the phase phase, with the aim of orpat njrnv, ng transpositions.

However, such control does not affect the action of the relay protection, since the inclusion of a resistor in the neutral of the network I / places after the arc is extinguished during the restoration of the voltage on the damaged phase

Cerio's invention of vpnetc boosts network operation by v nnetH by improving SRLRKT In -us relay to protect it from earthquakes in networks with com-

DailifOH CHRYTR & LHO

The operation is achieved by the fact that the device for enhancing the reliability of the network with d) mnedyyuyu neu and uaelshachi power supply system relay protection gs | ss iy contains a arc of a coil, which is connected in a fuzzy directional circuit with successively connected circuits. The unit, whose input is connected to the control unit, the emergency selection unit and the threshold unit, the input of which is connected to the output of the pilot phase and has a cv & Aio OR and RU.O. pore in (about Port NEP unit with the control unit through at 1 / A 1L, VUOD MAHB detection / stopchi Aogo xapaitera burning arcs are connected to bloom BL bsra damaged fzz network it Rala m, its output - to the scheme 1/1 PI

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The presence of a block of detection of the -RHM of the nature of the arc arises when the active activation of the group Sgr1 / gz was removed during a resetting operation (es i of the arc when it is connected to an increase in the multiplicity i ket hos ti affecting the network of persiapb hs The connection of active connection only in the steady arc mode when this stable mode lasts a sufficiently long time when the likelihood of the arc is small and is connected between the blocks ti block manager Egor obesgo Chiva workable; g1osled combu h mode with limiting overvoltages, etc., and the roaming arc upegn vnie se ui - ciency zaschitm at ustoichsh n hzram J combustion dui / 1

The mode of stable rope-arc is determined by the simultaneous existence of two signs, the presence of a neutral phase voltage and a voltage close to zero at neutral

For this purpose, the unit (the maximum type is stable, the arc nature contains two threshold blocks, not installed at the input one with a setting close to the phase voltage / voltage from the neutral voltage of the other - from

WHICH BLINDY TO N L L O TH EPRG END g, o

congenital phase Phase with a set value close to / sorts the rec reciever circuit NS with 1 circuit1 and at the rsgo input of which is fed from the output of the cellular neutral voltage unit signal from the output of the circuit AND appears nps- coincidence of the conditions of the existence of a stable circuit to the ground Elemeept BPF-ME included (and between the And and outputs circuitry, the block of arresting and stable arcs, provides the necessary VMER time for the unit to operate from the short-term gs rhenium steady hollow mode when self-heating is possible

Fig. 1 shows a principle circuit diagram of a device for protection against overvoltages in a network with a compensated ioy, in Fig. 2 is a schematic diagram of a detection unit of a stable nature (arc arc

The device contains arc wires of a boom 1, resistor 2, turned on by a parzglel-but through a high-speed switch 3, block 4 for selecting a damaged zza switch block 5 for controlling the switch, threshold fine b, block 7 for detecting the stable nature of an arc or scheme OR 8 Block for selecting top 5

ABOUT

3

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pepper

Dennpch Nrazy 7 contain tail-TR blocks Q and 10 to NOT 11 11-h-th And 12 zlemezh 13

The inputs of more than 4 Bbif oradesodesm F-SGLI are connected to; Sam and you are with the entrance of the threshold block, P / ONE, the block of the connection, with the block of damaged and with a leak. Its output with the circuit 1 / 1Л Ч 31 I / O / 1 of the coyro with pin Egg ° with the ghod of Olchka 5 ugoa-9 / i sh 3

Threshold block 9 by connecting with KOiiTfj or C1 network through GHGMU and 1 commandline with 1 topic - 5 TIME 3 Threshold-jf 1P, VLDOM connected with the rhbs unit, - turned out / 4 type (4, CXOMV 4V, oV / dV / OEP). ing -it second with / Ы Ы Ы And 12 0 w, -lgrntch РРРМЯ П vm- WODOM Black stable 1YD /

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In t tm mode - at the output of block 4 of the swfiopi phase, the signal is omitted by ommuyur 3 is open and the reolstdo 2 r e atichs 1 is on the counterparts.

10СЛ8ЦО ЗТРПЬНОГТИ

The moving arc and the HVM with it can be used with -trua i-s (stroke 4 бор bors1 damaged area, damage to the injuries caused by the injuries of the n fcroBioio Cmo ci b GI, the amplitude of the damage, the statute n the fcroBioio Cmo ci b GI, the amplitude of the damage, the statute n fcroBioio Cmo ci b GI, the ampli- the control voltage through r vy / iii / i 8 goes to block 5 / switchboard and switches on the com- / iv / t J7 J At this / there is a jumper / t / 1.1 ogtr e resistor 2 nap; / p mie on neutral sganovtstch equal -tji ":, a nanprveni-q h oaz of the network of stannovtstch equal chom / alnnom phase and lh vozshknoznosti t simemmyh (Standards are not about 90%)

In the suction mode, up to the mi and 1h axis and signaling to the aropoi y input 1 / T1I 8, the action / block / id was blocked from measuring the damaged phase, it goes to the second input not equal} - the threshold is fz, OK 10 , nMeioui, -shallow / o-tevsu grg aghvaye and exit gheypi IIF 11, block 10 is connected to the 4t.the second unit, the loop leci viii T is connected, so the signal from the output of the circuit 12 O1

If the mode is aggrieved, set up with, then, in the presence of gpn on neutral, it triggers the block 9, which is close to the face.1 of each frame of the same type of phase 5. mc equal to small4. , c d e f.op j, egch Ј “trees 10 ps contio ny ln vro yhg, e logical logical D4 is known

the output of the ME circuit, therefore, will be logical G, so on both inputs of the AND 12 circuit there will be logical 1 on the OGO output there will also be logs (skue 1, If this state is sufficiently durable, then the TIME 13 element having the appropriate setpoint will work and will send a control signal through the circuit OR 8 to the switch control unit 5 A resistor 2 will be connected to the neutral of the network with additional active current superimposed on the damage site, which ensures the selectivity of the protection from earth to earth, in particular in the case of resonance oh nlstroykidugogas conductive pails 1 when The magnitude of the residual current in the fault point is small, which deteriorates the village ciency protection.

The proposed device allows to provide selective operation of even simple current protection against the ZEMYKZNUSH to earth in compensated networks. The operation of the proposed device prevents the continuous connection of active resistance to the mains neutral in the intermittently arcing mode, which can lead to accidents.

Claims (1)

Claim 1 Inferment of overvoltage protection in a network with compensated neutron according to aut. No. 1427469, characterized in that, in order to increase reliability by improving the relay protection against earth fault, it is equipped with a detection unit for the arc burning mode and the IL1 / circuit, the output of the threshold block is connected to the control unit via the OR circuit, the inputs of the steady arc burning detection unit are connected to the block for selecting the damaged network phase and neutrin.fo, and its output to the OR circuit . 2, Ug.1, the understanding according to p. 1, I distinguish the shchet so that the detection of the persistent nature of the bitter arc contains two threshold blocks, one of which, the input connected to the block of choice of the damaged phase, is connected to the input element TIME, and the other, the input connected to the neutral, through the NOT circuit - to the second input of the AND circuit, the output of the TIME element is the output of the block for detecting the stable nature of the arc. flUff. 77 G L % I / J y , „- , V 1 & 1 $ &. /