CN101501799B - Signal generation unit and method to generate a data signal in a control unit of a power system device - Google Patents
Signal generation unit and method to generate a data signal in a control unit of a power system device Download PDFInfo
- Publication number
- CN101501799B CN101501799B CN2007800301505A CN200780030150A CN101501799B CN 101501799 B CN101501799 B CN 101501799B CN 2007800301505 A CN2007800301505 A CN 2007800301505A CN 200780030150 A CN200780030150 A CN 200780030150A CN 101501799 B CN101501799 B CN 101501799B
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- China
- Prior art keywords
- relay
- relay contact
- transistor switch
- signal
- control unit
- Prior art date
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Relay Circuits (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
A signal generation unit and a method for generating a data signal in a control unit of a power system device, especially of a tap changer drive unit, are provided. The signal generation unit comprises a signal relay (6) to alternately open and close at least one relay contact thereby performing a switching operation between two different output voltages and a protection circuit in parallel with the at least one relay contact for protecting the at least one relay contact against overvoltages. The at least one relay contact corresponds to two relay output terminals (8). In order to allow the signal generation unit to be used for different AC or DC output voltages and up to a maximum rated inductive load the protection circuit comprises a rectifier unit (12) in parallel with the two relay output terminals (8), a transistor switch (10) connected in parallel with the DC output of the rectifier unit (12) so that the DC output of the rectifier unit is short-circuited when the transistor switch is closed by the switch control unit and a switch control unit (11) for closing the transistor switch (10) before opening the at least one relay contact and opening the transistor switch (10) after the at least one relay contact is opened.
Description
Technical field
The present invention relates in the control unit of power system device, generate the signal generation unit and the method for data-signal.Especially, said control unit is to be used for tapping device (tap-changer) driver element.
Background technology
Generally speaking, relay is well-known in the prior art, and they are generally used for connecting loads to power supply, for example at US 4,466, and 038 and US 6,621, among the 668B1, the mechanical relay to load applications AC power has been described respectively.Open and close the arc discharge that occurs during the relay contact in order to be suppressed at, solid-state switch is parallelly connected with relay.Respectively open or the closing relay contact before, closed this solid-state switch; And open or the closing relay contact after, open this solid-state switch.Relay with respect to as power switch work the present invention relates to signal relay.
In current high and medium voltage electric power system and electric power networks; Generate, transmit and handle the dissimilar signal of carry data information; So that carry out the function of the various power system devices of measurement, control, adjustment and protecting network; Said equipment such as, generator, transformer, bus and high pressure switching device.These equipment are parts of so-called high and medium voltage switching device." ABB SwitchgearManual " in that Hennig Gremmel is shown, in ISBN 3464482367, the 711-771 pages or leaves, is called subsystem with the system that carries out different control functions by the 10th edition.The difference of said subsystem and main system is the following fact: subsystem management information rather than managing power.
Dynamo-electric with electromagnetic equipment, perhaps generate the data-signal that in the control unit of subsystem, uses through contact through contactless electronic installation.The present invention relates to have the control unit of contact equipment, and more specifically, relate to control unit with signal or light-duty (light-duty) relay.
Through between two kinds of different output voltages, carrying out handover operation, use signal relay to generate data-signal, wherein two kinds of output voltages are represented the high level and the low level of binary signal.Usually, signal relay is through closed and open one of its contact and come only an output voltage to be switched to out or closes simply.This operator scheme can also be described as between rated voltage and zero volt, switching.The quantity that depends on the contact, relay can have the lead-out terminal of varying number according to its switching behavior.For example, can it be categorized as and have usually closed or the relay of general open contact and a relay with two transfer contacts.Because these configurations can be double, thereby in market, have two relays with upper contact and corresponding output end.
The output voltage of the signal relay that in the control unit of power system device, uses can be AC signal form or DC signal form; And can marked change in its voltage level; Promptly; From 24V to 250V, this depends in the actual realization of electric power networks inner control unit and depends on regional or local codes and standards.
In addition, the electrical code of the output port of control unit (data-signal is output in this) depends on the user.The electric circuit that is connected to output port can be capacitive character or inductive characteristic.If inductive load (it is described by time constant L/R usually in this context) is connected to the output port of control unit, generate opposite emf (electromagnetic force) during then when one of contact through the opening signal relay and with current interruptions with peak value.As a result of, possibly between two contact elements of contact, produce spark, this possibly cause material migration between the contact element and the evaporation that is caused by high temperature.The negative effect of the inductive load on relay contact is that ratio is more disruptive in the AC circuit in the DC circuit.
Under the situation of DC, for the protection relay contact element, commonly known in the art is that RC circuit (being also referred to as buffer (snubber)) and relay terminal are connected in parallel.Capacitor suppresses discharge in the moment that contact element is opened, and this is that this electric current of series resistor limits is to prevent to form spark simultaneously because the electric current that emf causes is branched to wherein.Under the situation of AC, prior art suggestion strides across inductive load and uses the resistor (being also referred to as rheostat) that relies on voltage, and it has low resistance and has high resistance during in low-voltage when high voltage.
Voltage level and the variation of load characteristic with application purpose of control unit cause in market, existing the control unit of the number of different types that is used for power system device.At the tapping device that is used for power transformer and the special dimension of driver element thereof, there are different configurations up to thousands of kinds.For example in WO 01/92978A1, having described the modern times of the driver element that is used for the tapping device realizes.
Summary of the invention
In order to reduce the quantity of dissimilar control units; One object of the present invention is to provide a kind of signal generation unit and method that is used for the power system device control unit; It can be used for generating the data-signal of different dc voltages; And it allows the corresponding output end mouth of control unit is connected to different inductive loads, and need not any adjustment or change.Because the control unit that the is used for the tapping device especially kind of driver element is especially various, so another purpose of the present invention is to provide a kind of signal generator unit of driver element of the tapping device with above-mentioned characteristic.
The present invention is based on the understanding for the following fact: if the device of the influence of effective guard signal relay avoids maximum possible when the dc voltage level of maximum possible inductive load can be provided, then the signal generation unit also will be applicable to every other possible configuration.
Thus, through providing signal generation unit according to claim 1 and method according to claim 8 to realize this purpose.
The signal generation unit comprise aforesaid signal relay and with two protective circuits that lead-out terminal is parallelly connected of relay, wherein at least one relay contact is corresponding to lead-out terminal.According to the present invention, protective circuit comprises: transistor switch, and it is parallelly connected with two lead-out terminals; And switch control unit, be used for closed transistor switch before opening, and be used for after opening at least one relay contact, opening transistor switch corresponding at least one relay contact of at least two relay terminals.Transistor switch can be any possible type, that is, and and bipolar transistor, MOSFET or IGBT.If relay comprises more than said at least one relay contact, then protective circuit can with corresponding to many each in relay output end of a plurality of relay contacts to or only wherein some is parallelly connected.
Protective circuit further comprises and two rectifier units that relay terminal is parallelly connected at least, the DC output-parallel of wherein said transistor switch and rectifier unit, thus the DC of rectifier unit exports when switch control unit closed transistor switch by short circuit.It is possible that the same signal generating circuit that comprises said rectifier unit is applied to different configurations (comprising the AC output voltage).Rectifier unit will always provide dc voltage to transistor switch.
Comprise the step that dc voltage is applied to two lead-out terminals according to the method for the invention; Providing under the AC voltage condition; AC voltage is carried out rectification with the generation dc voltage, and protect at least one relay contact, wherein the DC output-parallel of transistor switch and rectifier through the closed transistor switch; Thereby the DC of rectifier unit exports when switch control unit closed transistor switch by short circuit; Next be to open at least one relay contact, between two different output voltages, carry out handover operation thus, and open transistor switch then.
The closed transistor switch allows continuous electric current, thereby when opening relay contact thereafter, prevents any reverse emf.The low internal resistance of transistor switch produces low-voltage between the pair of contact element of relay contact.Thus, open and transistor switch when closed, between contact element, do not have destructive voltage or spark when relay contact.
After opening relay contact, transistor is disconnected, thereby emf is increased in the voltage of transistor switch outlet side, and it is a collector emitter voltage under the situation of bipolar transistor.Thus, be combined in the maximum possible inductive load at maximum possible dc voltage level place, when selecting transistor switch, must consider maximum rating respectively to collector emitter voltage or drain source voltage.Select suitable transistorized other aspects to be the energy loss in the transistor, it is overheated that this loss possibly cause when surpassing the maximum power dissipation rated value.But,,, do not keep long after opening relay contact so need transistor switch be in the time of " connection " state because transistor switch is disconnected again according to the present invention.Thus, power dissipation keeps being in minimum level, thereby under regular situation, can not arrive its maximum rating.
Realize other purposes of the present invention by the driver element that is used for the tapping device, this driver element comprises the device that is used for the tapping device is moved to automatically desired locations, and it provides above-mentioned at least one signal generation unit.
In preferred implementation of the present invention, switch control unit is the closed transistor switch before closed at least one relay contact, and after closed at least one relay contact, opens transistor switch.To not be connected to the signal generation unit owing to do not know the load of which kind of type before, so during the closing relay contact, use transistor switch mainly to prevent the destructive overcurrent that causes by capacity load.
In another embodiment, as long as vibration (chatter) in signal relay, occurs, then switch control unit keeps transistor switch closed, so that guarantee the protection at least one relay contact comprehensively.
In another execution mode, the signal generation unit further comprises at least one rheostat, is used for that the guard signal generation unit is avoided suddenly and the influence of the voltage peak do not expected.At least one rheostat is preferably parallelly connected with the AC of rectifier unit input, and/or connects between terminal importing at the AC of rectifier unit and the protective ground.
Description of drawings
To by means of the mode of example the present invention be described more all sidedly with reference to accompanying drawing, in the accompanying drawings:
Fig. 1 shows the conventional ADS driving unit of tapping device;
Fig. 2 relates to the circuit diagram of the part of signal generation unit of the present invention;
Fig. 3 is respectively the time diagram of the control signal of transistor switch and signal relay;
Fig. 4 is the circuit diagram of an embodiment of the invention; And
Fig. 5 is the circuit diagram of another expansion execution mode of the present invention.
Embodiment
Be intended to supply the tapping device to use in the conventional ADS driving unit 1 shown in Fig. 1.It comprises: electro-motor 2, in order to come driving output driving shaft 4 as critical piece via gear unit 5; And control unit 3, in order to the operation of supervision and control motor 2, and the operation of keeping watch on and control the tapping device thus.The actual tapping device that in Fig. 1, does not illustrate will mechanically be connected to output driving shaft 4.
In order to generate external output signal, control unit 3 comprises the signal generation unit, and it comprises electromechanical relay.The electrical specification of output signal changes between AC of different electric voltage level (50/60Hz) and DC, and the load on the output port of control unit 3 can be a capacitive character or inductive.As a result of, the signal generation unit of driver element 1, especially control unit 3 must be applicable to each application especially, and this causes for the driver element of current tapping device, complex manufacturing and expensive.
In order to overcome this defective, the present invention advises using the signal generation unit, and it comprises the Electrical and Electronic assembly according to Fig. 2.
Through this signal generation unit, can same control unit 3 be used for different DC output voltages, and can bear maximum rating to inductive load.
Signal generation unit according to Fig. 2 comprises the signal relay 6 with relay coil 7.When relay coil 7 is supplied power by DC (being to supply power in this example), then corresponding to the relay contact closure of relay output end 8 by 24V.Relay contact comprises two contact elements 19, and is only schematically illustrated in the accompanying drawings.When corresponding to the relay contact closure of relay output end 8, the output voltage that strides across the lead-out terminal 9 of signal generation unit becomes 0.If relay contact is opened once more, then confirm to stride across the output voltage of lead-out terminal 9 by the external circuit that is connected to terminal 9.This output voltage is a dc voltage, and it is from changing between 24V to 250V.The external circuit that is connected to terminal 9 shows the inductive load behavior, at 250V DC and 100mA place up to maximum rating L/R=40mS.
All DC output-voltage levels and on to maximum rated inductive load, for guaranteeing that the signal generation unit comprises the special protection circuit corresponding to the protection of the relay contact of relay output end 8.Transistor switch 10 is parallelly connected with relay output end 8 or lead-out terminal 9 respectively.In this example, transistor switch 10 is IGBT.Transistor switch 10 at this in particular cases, is optoisolated phototransistor driver by switch control unit 11 controls.Switch control unit 11 produces control signal U
GBe used for grid according to the transistor switch 10 of Fig. 3.
In Fig. 3, drawn control signal U
GTemporal characteristics and control signal U
RTemporal characteristics, control signal U wherein
GThe grid that is used for transistor switch 10, and control signal U
RControl powers up relay coil 7.Under two kinds of situation, high signal level representes and should transistor switch 10 or signal relay 6 be connected respectively that wherein connection signal relay 6 means closed relay contact corresponding to relay output end 8.As visible among Fig. 3, the previous time period t that is switched at signal relay 6
Pre, on, transistor switch 10 controlled being switched on; And period t after signal relay 6 has been switched on
Past, on, transistor switch 10 controlled being disconnected.Similarly, the previous time period t that is disconnected at signal relay 6
Pre, off, transistor switch 10 controlled being switched on; And period t after signal relay 6 has been disconnected
Past, off, transistor switch 10 controlled being disconnected.The time period t of after the switching manipulation of signal relay 6, using
Past, onAnd t
Past, offAll be selected long enough, thereby allow the vibration in the signal relay 6 is suppressed under the predefine level.
For same signal generation unit is applied to DC and AC output voltage, according to Fig. 4, to the assembly interpolation rectifier unit 12 of signal generation unit.Rectifier unit 12 (under this particular case, being single phase rectifier bridge) is parallelly connected with relay output end 8 or lead-out terminal 9 respectively.Transistor switch 10 is connected directly to the DC output 13 of rectifier unit 12, thereby transistor switch 10 can be realized the function of parallelly connected relay output end 8, and protects contact element 19 thus, and no matter externally 9 of terminals are AC or DC.
According to Fig. 5, in the signal generation unit, comprise three rheostats 14,15 and 16, avoid the influence of voltage peak in order to the different assemblies 8,10,11 and 12 of guard signal generation unit.In the rheostat two 14 and 15 between one of the terminal of the AC of rectifier unit 12 input 18 and protective ground 17.The 3rd rheostat 16 is parallelly connected with lead-out terminal 9.
Claims (8)
1. a control unit (3) that is used at power system device generates the signal generation unit of data-signal, comprising:
Signal relay (6); In order to through alternately opening and closed at least one relay contact generates data-signal; Between two different output voltages, carry out handover operation thus; Wherein said at least one relay contact is corresponding to two relay output end (8), and it is parallelly connected with two lead-out terminals (9);
Protective circuit, parallelly connected with said two relay output end (8), be used to protect said at least one relay contact to prevent overvoltage;
It is characterized in that:
The AC of rectifier unit (12) input (18) and said two relay output end (8) and parallelly connected with said two lead-out terminals (9), wherein each of dc voltage or AC voltage is applied to said lead-out terminal (9);
Said protective circuit comprises:
Transistor switch (10), parallelly connected with the DC output (13) of said rectifier unit (12), thus when said transistor switch (10) was closed by switch control unit (11), the said DC output (13) of said rectifier unit (12) was by short circuit;
Switch control unit (11) is used for closed said transistor switch (10) before opening said at least one relay contact, and after opening said at least one relay contact, opens said transistor switch (10);
Wherein as long as vibration in said signal relay (6), occurs, then said switch control unit (11) makes said transistor switch (10) closure.
2. signal generation unit according to claim 1; Wherein said switch control unit (11) is closed said transistor switch (10) before said at least one relay contact of closure, and after said at least one relay contact of closure, opens said transistor switch (10).
3. signal generation unit according to claim 1 further comprises at least one rheostat (14,15,16), is used to protect said signal generation unit to avoid the voltage peak influence.
4. signal generation unit according to claim 3, one of wherein said rheostat (16) is parallelly connected with the said AC input (18) of said rectifier unit (12).
5. signal generation unit according to claim 3, one of wherein said rheostat (14,15) is connected between one of terminal of the AC of said rectifier unit (12) input (18) and protective ground (17).
6. driver element (1) that is used for the tapping device comprising:
Install (2,3,4,5), be used for said tapping device is moved to automatically the position of expectation; And
At least one is according to the described signal generation unit of aforementioned arbitrary claim.
7. method that is used for generating through at least one relay contact of open and close signal relay (6) alternately data-signal at power system device; Wherein said at least one relay contact is corresponding to two relay output end (8); It is parallelly connected with two lead-out terminals (9); And wherein said at least one relay contact is protected from over-voltage protection, it is characterized in that:
Dc voltage is applied to said two lead-out terminals (9), and said two lead-out terminals (9) are corresponding at least one relay contact of said signal relay (6), and is wherein providing under the AC voltage condition, said AC voltage by rectification to generate dc voltage;
Said at least one relay contact is protected according to the following steps that provide order:
Closed transistor switch (10); Wherein said transistor switch (10) is parallelly connected with the DC output (13) of rectifier unit; Thereby when said transistor switch (10) was closed by switch control unit (11), the said DC output (13) of said rectifier unit (12) was by short circuit;
Open said at least one relay contact, between two different output voltages, carry out handover operation thus;
Open said transistor switch (10);
Said method further may further comprise the steps:
The vibration of wait in said signal relay (6) decayed to and has been lower than given level, wherein after opening perhaps closed said at least one relay contact, carries out this step.
8. method according to claim 7 further may further comprise the steps:
Closed said transistor switch (10);
Closed said at least one relay contact;
Open said transistor switch (10).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06118943.7 | 2006-08-15 | ||
| EP06118943A EP1890214A1 (en) | 2006-08-15 | 2006-08-15 | Signal generation unit and method to generate a data signal in a control unit of a power system device |
| PCT/SE2007/050555 WO2008020808A1 (en) | 2006-08-15 | 2007-08-15 | Signal generation unit and method to generate a data signal in a control unit of a power system device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101501799A CN101501799A (en) | 2009-08-05 |
| CN101501799B true CN101501799B (en) | 2012-02-15 |
Family
ID=37499505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800301505A Expired - Fee Related CN101501799B (en) | 2006-08-15 | 2007-08-15 | Signal generation unit and method to generate a data signal in a control unit of a power system device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1890214A1 (en) |
| CN (1) | CN101501799B (en) |
| DE (1) | DE112007001923T5 (en) |
| WO (1) | WO2008020808A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012222782A1 (en) * | 2012-04-10 | 2013-10-10 | Siemens Aktiengesellschaft | Switching device i.e. safety switch, for switching supply network voltage for protecting electric circuit, has switching element including minimum voltage strength smaller than total minimum voltage strength between switching contacts |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2147671Y (en) * | 1993-01-03 | 1993-11-24 | 徐行玉 | Overload protector for motor phase losing |
| CN2622897Y (en) * | 2003-06-03 | 2004-06-30 | 余彦中 | Output circuit device of self-controlled cut-off protective signal relay |
| EP1655753A1 (en) * | 2004-11-09 | 2006-05-10 | I.A.C.E. di Cristina Adriano | Switch device for electrical relays |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3639808A (en) * | 1970-06-18 | 1972-02-01 | Cutler Hammer Inc | Relay contact protecting circuits |
| US4466038A (en) * | 1982-02-01 | 1984-08-14 | Hewlett-Packard Company | Hybrid power switch |
| SE519492C2 (en) | 2000-05-26 | 2003-03-04 | Abb Ab | Actuator and winding coupler including one |
| US6621668B1 (en) * | 2000-06-26 | 2003-09-16 | Zytron Control Products, Inc. | Relay circuit means for controlling the application of AC power to a load using a relay with arc suppression circuitry |
-
2006
- 2006-08-15 EP EP06118943A patent/EP1890214A1/en not_active Ceased
-
2007
- 2007-08-15 DE DE112007001923T patent/DE112007001923T5/en not_active Withdrawn
- 2007-08-15 CN CN2007800301505A patent/CN101501799B/en not_active Expired - Fee Related
- 2007-08-15 WO PCT/SE2007/050555 patent/WO2008020808A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2147671Y (en) * | 1993-01-03 | 1993-11-24 | 徐行玉 | Overload protector for motor phase losing |
| CN2622897Y (en) * | 2003-06-03 | 2004-06-30 | 余彦中 | Output circuit device of self-controlled cut-off protective signal relay |
| EP1655753A1 (en) * | 2004-11-09 | 2006-05-10 | I.A.C.E. di Cristina Adriano | Switch device for electrical relays |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1890214A1 (en) | 2008-02-20 |
| DE112007001923T5 (en) | 2009-06-25 |
| CN101501799A (en) | 2009-08-05 |
| WO2008020808A1 (en) | 2008-02-21 |
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Effective date of registration: 20180426 Address after: Baden, Switzerland Patentee after: ABB TECHNOLOGY LTD. Address before: Zurich Patentee before: ABB T & D Technology Ltd. |
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