SU1615834A1

SU1615834A1 - Autotransformer with redundancy protection device

Info

Publication number: SU1615834A1
Application number: SU874281424A
Authority: SU
Inventors: Владимир Иванович Нагай; Эдуард Борисович Пугачевский; Виктор Григорьевич Шуляк
Original assignee: Новочеркасский политехнический институт им.С.Орджоникидзе
Priority date: 1987-07-13
Filing date: 1987-07-13
Publication date: 1990-12-23

Abstract

Изобретение относитс к электротехнике, в частности к релейной защите, и предназначено дл селективного отключени защищаемого автотрансформатора в случае отказа защиты ошиновки или основной защиты автотрансформатора. Цель изобретени - повышение селективности и быстродействи при отключени х коротких замыканий на ошиновках. При коротком замыкании (КЗ) на ошиновке высшего напр жени (ВН) и двухстороннем питании автотрансформатора замыкаютс контакты 28 и 34 реле мощности. В цепи реле времени 54 происходит отключение всех выключателей автотрансформатора. При КЗ на ошиновке высшего напр жени и отсутствии питани со стороны среднего напр жени отключение выключателей обеспечиваетс за счет замыкани контактов 32 и 32 в цепи реле времени 54. При КЗ на ошиновке ВН и отсутствии питани со стороны ВН происходит отключение автотрансформатора по цепи контактов: 23,30 и вновь введенных контактов 38 реле положени "включено" выключател . 2 ил.The invention relates to electrical engineering, in particular, to relay protection, and is intended to selectively disable the protected autotransformer in the event of a busbar protection failure or basic autotransformer protection. The purpose of the invention is to increase the selectivity and speed when short-circuits are disconnected at busbars. In the event of a short circuit (short circuit) on a high voltage busbar (HV) and two-way power supply to the autotransformer, the power relay contacts 28 and 34 are closed. In the circuit of the time relay 54 all the autotransformer switches off. When the short circuit on the higher voltage busbar and the lack of power from the medium voltage side, the disconnection of the switches is provided by closing the contacts 32 and 32 in the time relay circuit 54. When the short circuit on the high voltage busbar and the lack of power from the high voltage side, the autotransformer disconnects via the contact circuit: 23 , 30 and the newly introduced contacts 38 of the on / off relay. 2 Il.

Description

Изобретение относитс к электротехнике , в частности к релейной защите, и предназначено дл селективного отключени защии аемого азтотрансформатора.в случае отказа защиты ошин озки или основной защиты а:Бтотр-ансфорг-, 1атора,The invention relates to electrical engineering, in particular, to relay protection, and is intended for the selective disconnection of the protected transformer. In case of failure of the protection of the Oshin or main protection a: Btotr-AnSforg, 1ator,

Цель изобретени - повышение селективности и бстродействи при отключени х коротких замыканий иа ошиновках.The purpose of the invention is to increase the selectivity and the high speed when short circuits are disconnected in the busbars.

На фиг, 1 приведена электрическа схема ПОДСТ.ЭНЦИИ, содержащей.два параллельно работающих автотрансформатора, и схема подключени -измерительных органов защиты к измерительным преобразовател м тока и напр жени ; на фиг,2 - схема цепей оперативного посто нного тока устройства резервной защиты автотрансформатора , . Fig. 1 shows an electrical circuit of SUBSTITUTION; containing two parallel-running autotransformers, and a circuit for connecting the protection measuring organs to current and voltage measuring transducers; FIG. 2 is a circuit diagram of the operational direct current circuit of the backup protection device of the autotransformer,.

Автотрансформаторы (AT) 1 и 2, включенные на параллельную работу, подключены к сети высшего напр жени (ВН) выключател ми 3 и 4 через разъединители 5, 6 и 7, 8. Шины ВН соединены шиносоединитель- ным вы1 л очателем 9. К шинам среднего напр жени (СН) AT подключены выключател ми 10 и 11 через разъединители 12,13 и 14, 15. Шины СИ соединены шиносоеди- нительным выключателем 16, К сети низшего напр жени (НН) AT подключены выключатели 17, Устройство резервной защиты содержит трансформаторы тока-ТТ 18 и 19, в-сгроенные в выключатели 3 и 10. ТТ 20 и 21, BCTpOBHiibie во втулки защищаемого AT, и трансформатор напр жени ТН 22, подключенный к стороне НН. Комплект 23 за- , устанзплийэемый на сторонах ВН и Chi, включает в себ реле направлени мощности (ЮЛ 1) 24, подключенное к ТТ 20 и ТН данной стороны (неуказан) и ориентированное-в сторону сети, реле тока (КА1)25, подключенное к ТГ 20 и реле направлени мощности (KW2)26, подключенное кТТ 18иТН данной стороны к ориентированное в сторону AT, К ТН 22 подключено реле напр жени (KV1)27,Autotransformers (AT) 1 and 2, connected to parallel operation, are connected to the high-voltage network (HV) by switches 3 and 4 through disconnectors 5, 6 and 7, 8. HV buses are connected by bus coupler 9. To buses The middle voltage (СН) AT are connected by switches 10 and 11 through disconnectors 12,13 and 14, 15. The SI buses are connected by bus-connecting switch 16, Switches 17 are connected to the low-voltage network (LV) AT, Backup protection device contains transformers current-TT 18 and 19, built into switches 3 and 10. TT 20 and 21, BCTpOBHiibie in protection bushings aemogo AT, and the transformer voltage VT 22 connected to the LV side. Kit 23, installed on the HV and Chi sides, includes a power direction relay (SL 1) 24 connected to the TT 20 and TH of this side (unspecified) and oriented in the direction of the network, a current relay (KA1) 25 connected TG 20 and power direction relay (KW2) 26, connected to the CTT 18 and THN of this side, are connected to the AT oriented side, and voltage relay (KV1) 27 is connected to the TN 22,

Цепм переменного оперативного тока (.2) ;одер. первые замыкающие контакты 28 и 29 реле направлени мощности KVVi) 24,- .амык.акзидие такты 30 и 31 иAC Operative Current Circuit (.2); Oder. the first closing contacts 28 and 29 of the power direction relays KVVi) 24, -amyk acydie cycles 30 and 31 and

размыкающие контакты 32 и 33 реле 25 тока, замыкающие.контакты 34 и 35 реле 26 направлени мощности комплектов 23, установленных на сторонах ВН и СНthe disconnecting contacts 32 and 33 of the current relay 25, closing. The contacts 34 and 35 of the relay 26 of the direction of power sets 23, installed on the sides of HV and CH

соответственно, размыкающие 36 и 37 и замыкающие 38 и 39 контакты реле положе-. ни Включено выключателей 3 и 10, реле 40-43 реле. Цепи из последовательно соединенных замыкающих контактов 44, 45 иrespectively, the opening 36 and 37 and the closing 38 and 39 relay contacts pos. neither Switches 3 and 10 turned on, relay 40-43 relays. Circuits from series-connected make contacts 44, 45 and

46,47 реле 26 направлени мощности и реле 25 тока обеих сторон AT включены параллельно между собой и. последовательно с размыкающими контактами 48 и 49 реле 24 направлени MOIHHOCTV и замыкающим46.47 power direction relays 26 and current relays 25 of both sides AT are connected in parallel with each other and. in series with the opening contacts 48 and 49 of the MOIHHOCTV relay 24 and the closing

контактом 50 реле 51 времени, в цепь которого включен замыкающий контакт 52 реле 27 напр жени . Замыкающий контакт 53 реле 54 времени включен в цепь отключени всех выключателей AT. Замыкающиеcontact 50 time relay 51, in the circuit of which the closing contact 52 of voltage relay 27 is connected. The closing contact 53 of the time relay 54 is connected to the open circuit of all the AT switches. Trailing

контакты 55, 56 и 57, 58 реле 40, 41 и 42, 43 времени включены в цепь отключени выключателей 9,3 и 16,10 соответственно.time contacts 55, 56 and 57, 58 of time 40, 41 and 42, 43 are included in the tripping circuit of switches 9.3 and 16.10, respectively.

Работу устройства рассматривают п-ри внешнем КЗ на стороне высшего напр жени на ошиновке ВН.(т,е. между ТТ.18 и 20 при двухстороннем питании, при одностороннем питании,, а также при внутреннем КЗ в AT 1).The operation of the device is considered by the parameters of an external short circuit on the higher voltage side of a high-voltage busbar (i.e., between TT.18 and 20 with two-way power, with one-sided power, and also with internal short-circuit in AT 1).

При внешнем КЗ в сети ВН происходитWhen an external short circuit in the VN network occurs

срабатывание реле 24 мощности и реле 25 тока, что,приводит к образованию цепи из замыкающих контактов 28 и 30, замкнутого контакта.36 реле положени Включено выключател 3 и реле 41 и 42 времени. Этоthe operation of the power relay 24 and the current relay 25, which leads to the formation of a circuit from the closing contacts 28 and 30, the closed contact. The position relay is on. The switch 3 and the time relay 41 and 42 are on. it

приводит к замыканию контакта 55, затем контакта 56, что обеспечивает отключение с первой выдержкой времени шиносоедини- тельного выключател 9, а с второй выключател 3, При КЗ на ошиновке ВН AT 1 иleads to the closure of the contact 55, then the contact 56, which ensures the disconnection of the busbar switch 9 with the first time delay, and the second switch 3 with the short-circuit on the high-voltage busbar AT 1 and

двухстороннем питании происходит замыкание контактов 28 и 34 реле 24 и 26 мощности , что обеспечиваетсрабатывание реле 54 времени и отключение выключателей 3, 10, 17 с выдержкой времени, отсроенной отtwo-way power circuit closes the contacts 28 and 34 of the power relay 24 and 26, which ensures that the time relay 54 is triggered and the switches 3, 10, 17 are triggered with the time delay removed from

времени разновременности включени фаз выключателей AT 1, При КЗ на ошиновке ВН и отсутствии питани .со стороны СН отключение выключателей AT 1 обеспечиваетс за счет замыкани контактов 32 и 34 в цепиthe time of phase difference between the switches of the AT 1 switches, the short circuit on the HV busbar and the lack of power from the CH side, the AT 1 switches are turned off by closing the contacts 32 and 34 in the circuit

реле 54 времени. Уставка реле 25 тока выбираетс по услови м отстройки от тока небаланса нулевой последовательности. Реле 25 тока предназначено дл контрол наличи тока в цепи AT. При КЗ на ошиновке ВЫ и отсутствии питани со стороны сети высшего напр жени (т..п. при отключенном выключателе 3) проходит отключение по цепи контактов 28-30-38 - реле времени 54. .relay 54 time. The setting of the current relay 25 is selected according to the detuning conditions of the zero-sequence unbalance current. Current relay 25 is designed to monitor the presence of current in the AT circuit. When there is a short-circuit fault on the OIN busbar and no power from the network of the higher voltage (i.e., when the switch 3 is turned off), the time relay 54 is disconnected through the circuit of 28-30-38 contacts.

При внутреннем повреждении в предварительном возбужденном AT, т.е. п.ри сработанных реле 27 напр жени , реле 51 времени и его замкнутом контакте 50, происходит срабатывание реле тока 2.5 и мощности 26 и не срабатывают реле 24 мощности . Это приводит к замыканию контактов 44, 45-и (или) 46, 47 и 48, 49, 50 в цепи р,еле 54 времени. Выдержка времени реле 51 времени выбираетс из услови отстройки от времени затухани броска намагничивающего тока при включении AT на холостой ход до уровн срабатывани реле 25 тока.In case of internal damage in pre-excited AT, i.e. When the voltage relays 27, the time relay 51 and its closed contact 50 are activated, the current relay 2.5 and power 26 operate and the power relay 24 does not operate. This leads to the closure of the contacts 44, 45 and (or) 46, 47 and 48, 49, 50 in the circuit p, barely 54 time. The time delay of the time relay 51 is selected from the condition of the detuning from the decay time of the surge of the magnetizing current when the AT is turned on at idle speed to the actuation level of the current relay 25.

Claims

Thus, the invention allows to disable the internal damage of AT and short-circuit on the HV and CH busbars with a minimum time delay of 0.2-0.5 s, and in some cases this time delay can be reduced and kept in operation the second autotransformer, which increases the reliability energy supply. Formula of the invention

An autotransformer with a backup protection device containing, on the high and medium voltage side of the protected autotransformer, the current relay and the first power direction relays oriented on the network side and connected to the voltage and current transformers. autotransformer, with on each side the first closing contacts of the current relay and the first power direction relay are connected in series with the winding of the first time relay, the closing contact of which is included in the circuit switching off the corresponding side of the autotransformer, the second closing contacts of the current relay on both sides are connected allelely to each other and in series with the opening contacts of the first two-side power direction relays, the closing contact of the second time relay and the winding of the third time relay turning off all the autotransformer switches, winding- 5, the second time relay is connected in series with the closing contact of the voltage relay, connected Locked to the voltage transformer of the lower side of the autotransformer, characterized in that

0 that, in order to increase the selectivity and speed when disconnecting short circuits on busbars, on the sides of high and medium voltages, the second direction relays are additionally introduced

5 powers, oriented in the autotransformer's ctopoHy and connected to voltage and current transformers, intended for on-: one to switches of the corresponding side, and fourth rela:

0 time, the windings of which are connected in parallel to the windings of the first time relay, and the closing contacts are intended to be included in the busbar disconnecting circuit of the corresponding side switch, with the current relay opening contact connected in series and the first closing contact of the second side power direction relay the highest and middle yarns are connected in parallel with each other and in series with the winding of the third. the time relay, the second closing contact of the second power direction relay is connected in series with the second closing contact of the current side switch of the corresponding side, on each of the indicated sides the current contact of the current switch is turned on. parallel with the first closing contact of the first power direction relay, in

0 power supply circuit of the windings of the first and fourth time relays — on, entered, opening, contact, relay, position. all current and power relays are made responsive to zero sequence components,

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