Device for voltage recovery and balancing at double-phase open fault in network

FIELD: electricity.

SUBSTANCE: device comprises network terminals, three fast-operate fast-release voltage relays with closing and opening contacts, seven repeater relays per a phase with closing and opening contacts, three phase-recovering capacitors, three phase-shifting chokes, three phase-compensating capacitors, terminals for the connection of a three-phase load and a power supply source. The voltage relays are coupled to phase voltage of the respective phases in the network, the phase-recovering capacitors are coupled to linear voltage, at that each of the capacitors is connected in series to an opening contact of the repeater relay of the respective phase, each of the phase-shifting chokes is shunted by the closing contacts of the first and second repeater relays of the respective phase and by the in-series closing contacts of the third and fourth repeater relays of the respective phase, the repeater relays are connected to the negative output of the power supply source directly and to the positive output through the closing contacts of the voltage relay respectively. Each phase-compensating capacitor is shunted by the closing contacts of the fifth and sixth repeated relay of the respective phase and the phase-shifting capacitor of each phase is coupled between the same phase of the network and the phase next to the retarding phase through the opening contact of the seventh repeated relay of the respective phase.

EFFECT: faster operation and bigger power of the device.

1 tbl, 1 dwg

 

The invention relates to electrical engineering and can be used as the device recovery and balancing of tension at break of the two phases of a network in power systems.

A device of the restoration and balancing of tension at break of the two phases of the network containing three relay minimum voltage with n / C and n / o contacts controlling the voltage in the network phase compensating capacitors, each connected in series with the NC contacts of the corresponding relay between the same phase of the power source and adjacent a lagging phase power source, three phase-shifting of the throttle, each of which is included between the phase of the power source and the same terminal to connect the three-phase load and shunted between series connected n / o relay contacts adjacent phases, three photocomposition capacitor, connected in series with the phase-shifting inductances between the phase-shifting chokes and corresponding terminals of the load, each phase advance capacitor wired parallel n / o relay contacts minimum voltage of the neighboring phases [1]. This device is characterized by simplicity of the scheme, the relatively high quality of electric energy� with the voltage recovery phase, however, the circuit through which the switching currents of the phases, are low voltage, so the device is applicable only for continuous supply of consumers with low capacity. In addition, the device has relatively low performance because it is used as relay minimum voltage conventional relays.

The technical result of the invention is to improve the performance and capacity of the device.

The technical result is achieved in that the device of the restoration and balancing of tension at break of the two phases containing three voltage relay that controls the voltage in the phases of the network, is provided with opening and closing the contacts, three photovoltaikanlage capacitor, three phase-shifting choke, three phase compensating capacitor and terminals for connection of three-phase load, the voltage relay is enabled on the corresponding phase voltage of the network, each of photovoltaikanlage capacitors connected in series with a normally closed contact of the corresponding relay between the same phase and adjacent lagging phase network, each of the phase-shifting chokes connected in series with the corresponding phase compensating capacitor phase network and stand-alone terminal for connection of three-phase� load each of the phase-shifting inductances shunted contact closure and a chain of series-connected contact closure, voltage relay is based on a relay that works with acceleration when triggered and released, we have introduced seven the use of auxiliary relays on each phase and entered a power source with positive and negative findings, all relays, repeaters connected to the negative terminal of that source directly, and to the positive conclusion of these sources through the no contacts of the relay voltage, respectively, each of the phase shifting inductances shunted marginal contacts of the first and second relay repeater and the corresponding phase cascaded marginal third and fourth contacts of the relay-repeater the corresponding phase, a phase advance capacitor of each phase shunted contact close fifth and sixth relay-repeater the corresponding phase, and photovoltaikanlage capacitor of each phase is connected between the same phase of the network and adjacent lagging phase through the NC contact of the seventh relay-repeater the corresponding phase.

The drawing shows a circuit diagram of the device of the restoration and balancing of tension at break of the two phases of the network.

The device contains�it network terminals A, B, C and 0, three voltage relay 1, 2 and 3 with acceleration when triggered and released, and contact closure, and contacts 1-1, 32, 34, 36, 38, 40 and 44 belong voltage relay 1, contact 1-2, 28, 30, 37, 39, 41 and 42 - voltage relay 2, contact 1-3, 29, 31, 33, 35, 43 and 45 - voltage relay 3; relay repeaters 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 and 27, then the relay repeaters 7, 8 and 9 is provided with normally closed contacts 7-1, 8-1 and 9-1, respectively, relays, repeaters 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 and 27 is provided with contact closure 10-1, 11-1, 12-1, 13-1, 14-1, 15-1, 16-1, 17-1, 18-1, 19-1, 20-1, 21-1, 22-1, 23-1, 24-1, 25-1, 26-1 and 27-1, respectively; photovoltaikanlage capacitors 4, 5 and 6, the phase-shifting chokes 46, 47 and 48, the phase compensating capacitors 49, 50 and 51, terminals for connection to three-phase load 52, 53 and 54 and a constant current source 55, while the relays 1 ...3 enabled on phase voltage: relay 1 controls the voltage in phase A; relay 2 controls the voltage in phase B, and the relays 3 - phase; photovoltaikanlage capacitors 4 ...6 included on a linear voltage: capacitor 4 are connected to phases A and b, the capacitor 5 is connected to phases b and C, and a capacitor 6 connected between phases C and A, each of these capacitors are connected in series with a normally closed contact of the corresponding relay-repeater: capacitor 4 is 7-1 with a contact relay-�of autorites 7, the capacitor 5 is 8-1 with a contact of the relay repeater 8 and capacitor 9 to 9-1 with a contact of the relay-repeater 9; phase-shifting the inductor 46 in series with a phase advance capacitor 49 is connected between phase A and ground terminal for connection of the corresponding phase three-phase load 52; phase-shifting the throttle 47 in series with a phase advance capacitor 50 is connected between phase b and ground terminal for connection of the corresponding phase three-phase load 53; phase-shifting the throttle 48 in series with a phase advance capacitor 51 is connected between phase C and ground terminal for connection of the corresponding phase three-phase load 54. Relay repeaters 7 ...27 is provided with two terminals (not labeled): the negative connected to the corresponding bus of the power source 55 directly, and the positive connected to the positive bus of the specified source using the no contacts: for example, the positive output of the relay-repeater 7 is connected to the positive bus 55 source through a normally open contact 1-1 voltage relay 1; the positive output of the relay repeater 8 is connected to the positive bus 55 source through a normally open contact 1-2 voltage relay 2; the positive output of the relay-repeater 9 is connected to the positive bus 55 source through a normally open contact 1-3 voltage relay 3; the positive output of the relay-repeater 10 is connected to the positive bus of the source 55 through the Deputy�apt contact 28, belonging to the relay 2; the positive output of the relay-repeater 11 is connected to the positive bus 55 source through a normally open contact 29 that belongs to the relay 3; the positive output of the relay-repeater 12 is connected to the corresponding bus of the source 55 through a normally open contact 30 belonging to the relay 2; the positive output of the relay-repeater 13 is connected to the positive bus 55 source through a normally open contact 31 of relay 3; the positive output of the relay-repeater 14 is connected to the positive bus 55 source through a normally open contact 32 of relay 1; the positive output of the relay-repeater 15 is connected to the positive bus 55 source through a normally open contact 33 of relay 3; the remaining number of auxiliary relays 16 ...27, contacts 34 ...45 connecting their positive conclusions from the positive bus 55 source and relay, which belong to the contacts 34 ...45, are summarized in table No. 1.

All the elements of an electrical circuit device series produced by the domestic industry. As electromagnets voltage relay can be used electromagnets series UM 26-6, in which the operating time and release time is equal to 0.05 s, and the electromagnets DC for the auxiliary relays may be applicable electromagnets series ET-2, the response time and release do not exceed 0.1 s.

The device operates as follows. In the way�Eskom mode if there is voltage at all inputs of the network And, B, C and 0 are triggered high-speed voltage relay 1 ...3 and closing the contacts of these relays: 1-1, 1-2, 1-3, 28 ...45 are closed, thus actuating relay repeaters 7 ...27, and the relay-repeater opens 7 7-1 contact in the circuit to charge the capacitor 4; relay repeater 8 opens the contact 8-1 in the circuit to charge the capacitor 5, and the relay-repeater 9 opens the contact 9-1 in the circuit to charge the capacitor 6 and the capacitor will not function; relay repeaters 10 ...27 when input, closed contacts 10-1 ...27-1, continue chokes 46 and 48 and capacitors 49 ...51, so the currents in the phases will be as follows: phase current A - terminal network And contacts 10-1, 11-1, 12-1, 13-1, 22-1, and 23-1 and terminal 52 for connecting three-phase load; the current phase In - terminal network, contacts 14-1, 15-1, 16-1, 17-1, 24-1 and 25-1 terminal 53 and to connect the three-phase load; the current phase of the C - terminal network, contacts 18-1, 19-1, 20-1, 21-1, 26-1 and 27-1 and terminal 54 for connecting three-phase load. In the absence of voltage in any two phases of the network, for example in phases A and b, will only work relay 3, with contacts 1-3, 29, 31, 33, 35, 43 and 45 will be closed, resulting in actuation of the relay-repeater 9, which will drop the charge circuit of the capacitor 6, and the use of auxiliary relays 11, 13, 15, 17, 25 and 27. The voltage In phase b will appear at the expense of circuit elements: the capacitor 5 and NC contact 8-1; the voltage on phase A is formed from the phase In the POM�means of a chain, containing the elements 4 and 7-1, and the load currents in the phases will occur on circuits: phase current A - terminal A, closed contact 13-1, phase advance capacitor 49 and the terminal to connect the three-phase load 52; the current phase In - terminal, closed contact 17-1, closed contact 25-1 and the terminal to connect the three-phase load 53; current phase of the C - terminal, phase-shifting the throttle 48, closed contact 27-1 and the terminal to connect the three-phase load 54. Thus, the current in the phase b flows, bypassing the inductor 47 and the capacitor 50, the current in the phase A flows, bypassing only the inductor 46, and the current is in phase With only flows through the phase-shifting reactor 48, and are provided with the required phase shifts of vectors in three-phase system 52, 53 and 54. In the absence of voltage in the phases b and C or C and A recovery mechanism will be similar to those described, as each time will trigger only a single high-speed voltage relay. The recovery time and the balancing of tension in the power system will not exceed ten periods of industrial frequency, so many consumers will not have time to react to a power failure.

Thus, the capacity of the described device is only determined operating current power contacts of the auxiliary relays, and this is achieved the required technical result.

Sources taken from the tummy.�e

[1]. Patent RF 2122273, CL H02J 9/06, NM 5/14, 1997.

[2]. A. S. the USSR 1723627, CL H02J 9/06, NM 5/14, 1989.

[3]. Alexandrov K., Kuzmina E. G. Electrical drawings and schematics. M.: MPEI, 2007, p. 297, designation 6 above.

[4]. Electrical engineering Handbook. Vol. 2. Under the editorship of V. G. Gerasimov. M.: MPEI, 2003, p. 342, PL.34.1 and p. 343, tab.34.2.

Device restoration and balancing of tension at break of the two phases of the network containing three voltage relay that controls the voltage in the phases of the network, is provided with opening and closing the contacts, three photovoltaikanlage capacitor, three phase-shifting choke, three phase compensating capacitor and terminals for connection of three-phase load, the voltage relay is enabled on the corresponding phase voltage of the network, each of photovoltaikanlage capacitors connected in series with a normally closed contact of the corresponding relay between the same phase of the network and adjacent lagging phase network, each of the phase-shifting chokes connected in series with the corresponding phase compensating capacitor between the mains phase and the same terminal to connect the three-phase load, each of the phase-shifting inductances shunted contact closure and a chain of series-connected contact closure, characterized in that the voltage relay back�HN relay, working with acceleration when triggered and released, we have introduced seven the use of auxiliary relays on each phase and entered a power source with positive and negative findings, all relays, repeaters connected to the negative terminal of that source directly, and to the positive conclusion of these sources through the no contacts of the relay voltage, respectively, each of the phase-shifting inductances shunted marginal contacts of the first and second relay repeater and the corresponding phase cascaded marginal third and fourth contacts of the relay-repeater the corresponding phase, phase advance capacitor of each phase shunted contact close fifth and sixth relay-repeater the corresponding phase, and photovoltaikanlage capacitor of each phase is connected between the same phase of the network and adjacent lagging phase through the NC contact of the seventh relay-repeater the corresponding phase.



 

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