SU873370A1 - Synchronous machine excitation system - Google Patents

Synchronous machine excitation system Download PDF

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Publication number
SU873370A1
SU873370A1 SU792733992A SU2733992A SU873370A1 SU 873370 A1 SU873370 A1 SU 873370A1 SU 792733992 A SU792733992 A SU 792733992A SU 2733992 A SU2733992 A SU 2733992A SU 873370 A1 SU873370 A1 SU 873370A1
Authority
SU
USSR - Soviet Union
Prior art keywords
thyristor
parallel
unit
excitation
output
Prior art date
Application number
SU792733992A
Other languages
Russian (ru)
Inventor
Родион Григорьевич Гольдин
Владимир Яковлевич Тухман
Валентин Герасимович Якименко
Original Assignee
Предприятие П/Я М-5113
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Предприятие П/Я М-5113 filed Critical Предприятие П/Я М-5113
Priority to SU792733992A priority Critical patent/SU873370A1/en
Application granted granted Critical
Publication of SU873370A1 publication Critical patent/SU873370A1/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/46Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor

Abstract

The installation contains an excitation device (1), which is connected to the excitation winding, and a starting and protection apparatus (9), which responds to overvoltages of both polarities and has a plurality of parallel paths (strands) (11, 12, 13) with a resistor (15) and thyristor switches (16) connected in reverse-parallel, between the anode and control electrode of which thyristor switches (16) a first threshold-value element (20) is connected. A triggering circuit (14) contains a second threshold-value element (23) whose response voltage level is lower than that of the first threshold-value element, a storage unit (26) which can be switched on by the second threshold-value element (23), and a pulse-forming element (27) which can be triggered by the storage unit (26). This pulse-forming element is connected to the control electrodes of the thyristor switches (16) such that a voltage pulse switches the thyristors in the other parallel paths on once the current relay has responded as a consequence of the current flow through one parallel path (11, 12, 13). In consequence, the response reliability and operating reliability are increased and all the parallel paths are switched on only in the event of overvoltages on the excitation winding in the transition modes. <IMAGE>

Description

The invention relates to electrical engineering and can be used in the excitation systems of synchronous electric machines, mainly for synchronous electric machines, having in its composition a pathogen for feeding the main excitation winding. Izves: on the excitation system of the synchronous machine, containing a pathogen, the output of which includes a start-up protection unit, containing a series-connected resistor and a thyristor switch, controlled by a threshold element with a setpoint triggered by voltage. This excitation system is not sufficiently reliable due to the fact that any malfunction of the start-protective 6hoka (open circuit, loss of control, short circuit of the thyristor key) entails the danger of emergency shutdown or damage to the exciter and the synchronous machine. The closest technical solution to the invention is an excitation system for a synchronous machine containing;} a pathogen, to the output current of which the excitation winding of the synchronous motor is connected and a protection and starting-up unit of several parallel branches, each of which contains a series-connected resistor and a thyristor switch, between the anode and the control electrode of which a threshold element is connected with a voltage trip setting, as well as a current relay, one of the cat contacts cerned uprav.p connected to gate electrodes of the thyristors C2. This excitation system has greater scrupulousness, since the interruption of one of the parallel branches during normal operation of the others does not lead to the loss of protective functions, and, therefore, does not require emergency disconnection of the exciter and the synchronous machine from the network. However, the presence of parallel branches makes the start-up of a synchronous machine and some other modes insufficiently reliable, accompanied by the flow of significant currents through the start-up block. The threshold elements that control the thyristor switches O have a variation of the settings of the thyristor activation and activation times. With the inclusion of the first parallel branch of the start-protection block (for example, in the synchronous motor starting mode), the voltage on the excitation winding of the synchronous machine decreases, which is difficult, and sometimes it excludes the inclusion of the remaining parallel branches of the start-protective LLK. As a result, the entire launcher then flows through one parallel; the first branch causes its overheating. The aim of the invention is to improve reliability. The goal is achieved by additionally introducing an overvoltage sensor with a trigger voltage setting, a lower response value for the threshold element voltage, a memory unit and a pulse shaping unit, the overvoltage sensor input being parallel to the driver output, and the sensor output overvoltages are connected through the power supply unit to the input of the pulse shaping unit, the output of which is connected to other closing contacts of the current relay. In this case, the memory unit and the pulse shaping unit are combined in one node and are performed on a series-connected thyristor and a resistor. The drawing is a schematic diagram of the excitation system. The exciter 1 is connected to the excitation winding 2 of the synchronous machine 3. Parallel to the output of the exciter 1, the start-up unit 5 and the start-up unit 6 of the parallel branches 7, 8 and 9 of the start-up protective unit 5 are turned on through the current relay 4. In the parallel branches x 7 , .8 and 9 are in series connected resistor 10, latch switch 11, emergency shutdown unit 12 parallel. branches. Each of the thyristor keys 11 contains threshold elements 13 and 14. The start block 6 of parallel branches 7, 8 and 9 consists of an overvoltage sensor 15, made on zener diodes 16 and 17, a memory block 18 and a pulse shaping unit 19 the memory and pulse shaping unit jl9 are combined and made on thyristor ax 2a and 21, in series with which resistor 22 and zener diodes 23 and 24 are installed. Zener diodes 16 and 17 are connected between the anode of the thyristor 20 (21) and its control electrode zener diodes 16 and 17 more power supply during exciter 1, but less than the setpoint for triggering threshold elements 13 and 14 of thyristor keys 11. Current relay 4 is made on reed switches 25, 26 and 27. The cathode of zener diode 23 (24) through reed switch 26 (25) is connected to control electrodes of thyristor keys 11 parallel branches 7, 8 and 9. In parallel, the resistor 22 is turned on reed relay 28 control current thyristor 20 (21). The reed switch 27 and the output contact 29 of the reed switch 26 are connected to the input of the control system of the thyristor driver 1, and in parallel with each other. The excitation system operates as follows. In normal operation, the voltage at the input of driver 1 is less than the setting value of the zener diodes 16 and 17, and the threshold elements 13 and 14 of the thyristor switches 11, as a result of which the start-up device 5 does not turn on. Thyristor driver 1 provides the normal operation of the synchronous machine 3. In the transitional mode of operation of the synchronous machine 3, associated with the appearance of overvoltages on the winding 2 of the synchronous machine 3 (asynchronous operation, start of the synchronous motor, switching on the generator by the self-synchronization method) for example on the excitation winding (on the outputs of the excitation system) of a higher voltage setpoint operation, for example, Zener diode 16, the latter breaks through and opens the thyristor 20. On the circuit: Zener diode 23 thyristor 20, resis Op 22, zener diode 24 flows tok.Gerkonovoe relay 26 worked. A voltage appears at Zenith 24 that is sufficient to open thyristor switches AND parallel branches 7, 8, and 9, however, the control circuit of these keys is open with a reed switch 25. With a further increase in voltage, the threshold element 13 of the thyristor switch 11, for example parallel to branch 7 It is broken and opens the thyristor key 11 of this branch. The resistor 10 shunts the excitation winding 2 of the synchronous machine Z. Parallel branch 7 current is flowing; elements 13 of their thyristor: keys 11. But when current flows along the parallel branch 7, the current 4 switches and the reed switch 25 connects the pulse shaping device 19 to the control electrodes of the thyristor keys 11 parallel x branches 8 and 9. The thyristor keys 11 of these branches open {connected, connected to the excitation winding 2, the remaining parallel branches 8 and 9. Upon completion of the transient process, when the voltage induced in the excitation winding 2 of the synchronous machine 3 becomes less than the supply voltage, the start-protection unit 5 and the parallel branch start block 6 is turned off.
This happens due to the fact that the reed switch 27 and the contact 29 of the reed switch 28 act on the control system of the exciter, ensuring the disconnection of the thyristor keys 11 of the parallel branches 7, 8 and 9 and the thyristor 20.
I
If the transient process is characterized by a slight increase in voltage to a level higher than the setpoint of the operation of Zener diode 16, but less than the setpoint of operation of the threshold element 13 of the thyristor switch 11, blocks 18 and 19 are turned on. The reed switch 28 is activated, which, acting on the control system 30 of the exciter 1, ensures the switching off of the blocks 1B and 19 while reducing the voltage level to a value less than the setting value of the zener diode 16.
When a parallel branch fails, for example, the breakdown of the thyristor switch 11 of the parallel branch 8 / l of the exciter's normal mode of operation, emergency current flows through the resistor 10 of this branch. Current relay 4 is turned on, the reed switches 25, 26, and 27 are closed and connected; Pulse 19 to pulse control to the control electrodes of the thyristor switches 11 of the rest of the parallel branches 7 and 9. However, in this mode, the output voltage of the driver 1 is less than the set voltage of the operation voltage zener diodes 16, so the control pulse to the thyristor 20 is not supplied, the thyristor 20 is locked. The control voltage with the thyristor keys of 11 PARIS branches 7 and 9 is not formed and the indicated branches are not turned on.
When a parallel branch startup unit fails, for example, when thyristor 20 is broken through, Zener diode 24 appears voltage, but since parallel to 7, 8 and 9 does not flow, the reed switch 25 is open in the thyristor control circuit to prevent 11 flow. control pulses in the control circuit of the thyristor switches 11.
Since the chains of the block 6 for launching parallel branches 7, 8 and 9 are low-current, their long-term connection does not lead to an emergency situation.
If necessary, an alarm can be set to monitor the current duration of unit 6, for example, to control the heat generated by the chopper 22. Thus, this device enables the switching off of all parallel branches of the protection-starting unit in transient operation modes of a synchronous machine associated with the appearance of overvoltages on the excitation winding, for example, in the mode of starting the synchronous motor.
At the same time, this device prevents the inclusion of parallel branches of the tiycKo-protective unit in case of a malfunction of one of them or a malfunction.
Q block launch parallel lines.
Reliable insertion of all the pair of branches of the start-up block allows increasing the current load of the branches of the start-up block, therefore, reduce the size and weight as
5 of this device, as well as the excitation system in the whole, 1 1 without reducing the reliability of its operation.
Assembly of the memory unit and the unit FOI “4 impulses and execution
them on a series-connected thyristor and a resistor allows us to simplify the construction of these blocks, and also eliminates the need for additional power sources for their work.

Claims (2)

1. An excitation system for a synchronous machine, comprising an exciter, to the DC output of which the excitation winding of the synchronous machine and the start-up current are connected.
a unit made of several parallel branches, a KOTOI JX bus consisting of series-connected resistors and a key in series, the anode and control of the maximum electrode of which is connected
an element with a pickup setting; - for voltage, as well as a current relay, one of the closing contacts of which is connected to the control electrodes of the thyristor point, which differs from that. what. In order to ensure reliability, an overvoltage sensor with a voltage pickup is added to it, a lower pickup value for the pgneg element, a memory unit and a pulse shaping unit, and the input of the overvoltage sensor is parallel to the exciter output, and the output of the overvoltage sensor life
through the memory unit is connected to the input of the pulsed fusing unit, the output of which is connected to other closing contacts of the current switch.
2. The system of claim 1, distinguished from in that the memory unit and the pulse shaping unit are combined in one node and are performed on a series-connected thyristor and a resistor.
Sources of information taken into account in the examination
1. Vershinin PP, Hashper L. The use of synchronous electric drives
in metallurgy, M., Metallurgists,
2. Integrated thyristor devices ° ™ - Catalog, LKP. 341.631, Tallinn, 1971.
SU792733992A 1979-03-11 1979-03-11 Synchronous machine excitation system SU873370A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU792733992A SU873370A1 (en) 1979-03-11 1979-03-11 Synchronous machine excitation system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SU792733992A SU873370A1 (en) 1979-03-11 1979-03-11 Synchronous machine excitation system
DE19803009102 DE3009102C2 (en) 1979-03-11 1980-03-10
CH191480A CH653190A5 (en) 1979-03-11 1980-03-11 Excitation installation of a synchronous machine

Publications (1)

Publication Number Publication Date
SU873370A1 true SU873370A1 (en) 1981-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU792733992A SU873370A1 (en) 1979-03-11 1979-03-11 Synchronous machine excitation system

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CH (1) CH653190A5 (en)
DE (1) DE3009102C2 (en)
SU (1) SU873370A1 (en)

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DK165105C (en) * 1985-08-19 1993-02-22 Smidth & Co As F L Procedure and circuit for the protection of thyristors in an impulse generator
JP2000511337A (en) 1996-05-29 2000-08-29 アセア ブラウン ボヴェリ エービー Insulated conductor for high voltage winding and method of manufacturing the same
CA2256469A1 (en) 1996-05-29 1997-12-04 Abb Ab Transformer/reactor
SE9602079D0 (en) 1996-05-29 1996-05-29 Asea Brown Boveri Rotating electric machines with magnetic circuit for high voltage and a method for manufacturing the same
SE510192C2 (en) 1996-05-29 1999-04-26 Asea Brown Boveri Procedure and switching arrangements to reduce problems with three-tier currents that may occur in alternator and motor operation of AC machines connected to three-phase distribution or transmission networks
DE69725181D1 (en) 1996-05-29 2003-10-30 Abb Ab Vaesteraas LADDER FOR HIGH VOLTAGE WINDINGS AND ROTATING ELECTRICAL MACHINE WITH SUCH A LADDER
SE515843C2 (en) 1996-11-04 2001-10-15 Abb Ab Axial cooling of rotor
SE510422C2 (en) 1996-11-04 1999-05-25 Asea Brown Boveri Magnetic sheet metal core for electric machines
SE509072C2 (en) 1996-11-04 1998-11-30 Asea Brown Boveri Anode, anodizing process, anodized wire and use of such wire in an electrical device
SE512917C2 (en) 1996-11-04 2000-06-05 Abb Ab Method, apparatus and cable guide for winding an electric machine
SE508543C2 (en) 1997-02-03 1998-10-12 Asea Brown Boveri Coiling
SE9704431D0 (en) 1997-02-03 1997-11-28 Asea Brown Boveri Power control of synchronous machine
SE9704422D0 (en) 1997-02-03 1997-11-28 Asea Brown Boveri End plate
SE508544C2 (en) 1997-02-03 1998-10-12 Asea Brown Boveri Method and apparatus for mounting a stator winding consisting of a cable.
SE9704423D0 (en) 1997-02-03 1997-11-28 Asea Brown Boveri Rotary electric machine with flushing support
SE9704421D0 (en) 1997-02-03 1997-11-28 Asea Brown Boveri Series compensation of electric alternator
SE9704427D0 (en) 1997-02-03 1997-11-28 Asea Brown Boveri Fastening device for electric rotary machines
SE512721C2 (en) * 1997-09-30 2000-05-02 Abb Ab Rotary electric machine, machine comprising at least one rotating electric main machine and electric power plant comprising a rotating electric machine and method for magnetizing a rotating electric machine
EP1042853A2 (en) 1997-11-28 2000-10-11 Abb Ab Method and device for controlling the magnetic flux with an auxiliary winding in a rotating high voltage electric alternating current machine
GB2331867A (en) 1997-11-28 1999-06-02 Asea Brown Boveri Power cable termination
US6801421B1 (en) 1998-09-29 2004-10-05 Abb Ab Switchable flux control for high power static electromagnetic devices

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IT1037813B (en) * 1975-05-02 1979-11-20 Ercole Marelli Ec Spa Static DC power supply for inductive loads particularly suitable for powering the field winding of an electric machine in particular of a synchronous electric machine
SE406397B (en) * 1977-06-27 1979-02-05 Asea Ab FIELD FEEDING EQUIPMENT

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Publication number Publication date
CH653190A5 (en) 1985-12-13
DE3009102C2 (en) 1985-04-11
DE3009102A1 (en) 1980-09-25

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