CN2049842U - Short switch for electrical brake for water turbo-generator set - Google Patents
Short switch for electrical brake for water turbo-generator set Download PDFInfo
- Publication number
- CN2049842U CN2049842U CN 89201923 CN89201923U CN2049842U CN 2049842 U CN2049842 U CN 2049842U CN 89201923 CN89201923 CN 89201923 CN 89201923 U CN89201923 U CN 89201923U CN 2049842 U CN2049842 U CN 2049842U
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- Prior art keywords
- switch
- high voltage
- voltage isolator
- short
- isolating switch
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Abstract
The utility model relates to a short switch for the electrical brake for a water turbo-generator set. The utility model is characterized in that one pole of a set of main electric high voltage isolating switch and one pole of a set of auxiliary electric high voltage isolating switch are connected in parallel with the outlet terminal of a generator, the other pole of the auxiliary electric high voltage isolating switch is connected in series with a parallel circuit composed of a low voltage quick switch and a voltage-sensitive nonlinear resistor, the circuit is connected in parallel with the other pole of the main electric high voltage isolating switch, and three phases are in short connection. The main and auxiliary switches can use the single type or the made composite type high voltage isolating switches, and the short switch is formed on the foundation. In the process of switching off the switches, the auxiliary switch is switched off before the main switch to protect the main contacts of the switch from burning down.
Description
Conventional mechanical braking method is adopted in the braking of the most of hydraulic generator units of China at present, and this method is easy to generate mechanical wear and dust pollution.The hydraulic generator unit adopts electric braking, has indivedual power plant successfully to adopt this technology domestic in recent years.But owing to multiple reason, this technology fails to apply, and its main cause is the short switch that lacks economic and reliable.Because be connected on the short switch of generator outlet end, in unit running process, need bear the generator rated operational voltage, and in braking procedure, need flow through the short circuit current of 0.5～1.2 times of rated current of generator.As selecting this switch by the same condition of generator unit stator major loop switch, not only cost an arm and a leg, and volume is big, also arrange and bring certain difficulty to factory building.According to the foreign data introduction,, can adopt the electric isolating switch of relevant voltage grade and capacity to make short switch for rated voltage 11KV, hydraulic generator unit below the capacity 55MW.But the short switch that is used for voltage levels more or bigger capacity unit, the switch that then need adopt specialized designs to make, the contact of this switch need have and can tolerate electric arc and move characteristics fast.At present, China does not still have this type of switch production, make some should adopt the large-scale unit of electric braking can't adopt this mode of braking, and some large-scale hydroelectric plants under construction, then intend by external introduction special switch, it is reported, external also high or technical remaining at certain problem (contact burning) because of this class switch price, and make the utilization of electrical braking modes in the hydroelectric plant be restricted.
The purpose of the invention provides a kind of volume little at the problems referred to above exactly, and contact does not have scaling loss in the braking procedure, and long service life is economical and practical, safe and reliable short switch.
In braking procedure, it is to be in the excitation-free current state at generator that short switch closes a floodgate, the terminal voltage of generator only is the residual voltage that remanent magnetism produces, short circuit current is little, and the moving stable and heating condition after switch bears the short circuit current that is caused by residual voltage and adds stalling current reaches easily.Though electric current is bigger in the braking procedure, generator voltage approaches zero, thereby all parts that make brake switch except that being connected to generator end one side all can adopt lower withstand voltage standard.And the switch disjunction is just to carry out behind the unit full cut-off, thereby has not required cutout ability (to having except the special operational mode claimer).As long as be that this switch can satisfy following three requirements promptly: can cut off high voltage in (1) unit running process.(2) contact can tolerate the caused short circuit current of generator residual voltage.(3) can tolerate the ampacity that roughly is equivalent to the rated current of generator in the braking procedure.Obviously, this switch all conditions all is lower than the requirement of the switch of similar electric pressure capacity.Thereby can on the basis of electric isolating switch structure, improve and produce function admirable, the short switch that volume is little.The key of problem is the protection problem that how to solve contact in the making process.To this, the performance analysis when we have carried out the short switch combined floodgate.Think: improve the responsiveness of contact, can reduce the energy consumption of contact in the making process effectively; If improved the regularity of distribution of contact power consumption and resistance relation in the making process, the actual consumption of contact is reduced; Adopt the pressure sensitive nonlinear resistance of low field intensity can prevent to produce high-voltage arc between quiet in the making process, moving contact in addition.
According to above-mentioned conclusion, we have carried out the principle electrical circuit design of novel short switch.Because main electronic high voltage isolator (K
1) (hereinafter to be referred as K
1) and auxiliary electrical dynamic high-pressure isolating switch (K
2) (hereinafter to be referred as K
2) a utmost point be on the port of export (a) that is connected to generator (F), so (K
1) bear the rated operational voltage and the rated operational current of generator, and (K
2) bear the machine terminal shortcircuit electric current that generator rated operational voltage and unit remanent magnetism voltage are produced.(K
2) be connected in series by low pressure high-speed switch (K at (b) point
3) (hereinafter to be referred as K
3) and pressure sensitive nonlinear resistance (R
N) (hereinafter to be referred as R
N) parallelled circuit formed, and give (K
3) play isolated high voltage.(K
3) can be electromagnetism, machinery, electron type, as contactor, automatic switch, reverse-blocking tetrode thyristor, ionic discharge pipe, pressure sensitive nonlinear resistance or particular design with (K
1) the mechanical type high-speed switch etc. of interlock.Its closure has fair speed, can work under the short circuit current that residual voltage causes and does not have scaling loss.The key issue of this short switch is in making process, (K
2) should be prior to (K
1) closure, promptly at (K
2) after the reliable closure, make (K
3) conducting, last (K
1) just closed.Because (K
2), (K
3) the bypass effect of series loop, make (K
1) when closed, the regularity of distribution of its power consumption and resistance relation changes fully, promptly allows electric current from (K earlier
2) (K
3) middle shunting, with protection (K
1) unlikely scaling loss when closed at a slow speed.(R
N) be as (K
3) when shake takes place, have the part of bearing voltage drop, and suppress the high voltage in the switch motion process, also have protection (K
1) effect of contact.As (K
3) use contactless switch, because of there not being the contact jitter problem, so can cancel (R in the circuit
N).As (K
3) replace with the pressure sensitive nonlinear resistance, then in the circuit and the (R that connects
N) also can cancel.At this moment, must point out that the pressure sensitive nonlinear resistance is to be suitable for through-flow in short-term element, thereby have Rational Parameters to select problem, to take into account (K simultaneously
1), (K
2) capacity of contact, make their not burnings in making process.We also respectively with reverse-blocking tetrode thyristor, contactor, automatic switch, pressure sensitive nonlinear resistance as (K
3) situation study, by the calculation of parameter of large-scale unit, using has the tie lines of bypass loop can make (K
1) contact, maximum power dissipation is reduced to hundreds of watts in making process, only for there not being (K
2), (K
3) a few percent during circuit, burnt out so can guarantee that main contact (operator) is unlikely.
The advantage of the invention:
1. circuit theory and novel structure, simple, be skillfully constructed, solved requirement of short switch withstand voltage level and the requirement by big electric current with high voltage isolator, and done the bypass transition, solved the contact burning problem in the making process with the low pressure high-speed switch of low capacity.
2. volume is little, material is economized, cost is low, has reached economic, practical, reliable purpose.
Description of drawings and embodiment:
Fig. 1 is the invention electrical schematic diagram.
Fig. 2 is combined electronic high voltage isolator front elevational schematic.
Fig. 3 is combined electronic high voltage isolator schematic top plan view.
Fig. 4 makes (K with the half control bridge
3) novel short switch electrical schematic diagram.
Referring to Fig. 1, the invention is by main electronic high voltage isolator (K
1), auxiliary electrical dynamic high-pressure isolating switch (K
2), low pressure high-speed switch (K
3), pressure sensitive nonlinear resistance (R
N), the three-phase shortcircuit jumper forms.According to Fig. 1, we propose two kinds of embodiments and further specify as follows:
One, (K
1), (K
2) the electronic high voltage isolator scheme of the commercial single type of employing: (K
1), (K
2) should select correspondent voltage grade, (K for use
1) rated current choose (K by the rated current of generator
2) rated current choose by the rated current of generator about 3～5%.(K
3) by above-mentioned (K
2) same rated current can be selected 0.4KV level contactor for use, if the generator rated voltage is higher, and remanent magnetism voltage is when also higher, the coil of contactor and insulating part can suitably be strengthened, and use 1KV level automatic switch instead.If adopt (the K that contact is arranged
3), (R shown in Fig. 1 then
N) intend to adopt high energy ZnO pressure sensitive nonlinear resistance, resistance cut down threshold voltage approximately when dropping into brake switch, the unloaded remanent magnetism voltage of generator quite or low slightly then makes (K
2) closed immediate current is excessive and make (K
2) contact impaired.At (K
2) after the input, this (R
N) not only can protect (K
3), also can protect (K
1) the unlikely scaling loss of contact.For novel short switch (K in making process
2) should be prior to (K
2) closure.(K
2) after the closure, then (K
3) conducting, closed again (K
1).Above operation program can be controlled with general travel switch or electric interlocking installation and adjust.So this programme is simple, can utilize approved product to implement in general hydroelectric plant.
Two, (K
1), (K
2) the combined electronic high voltage isolator scheme that unites two into one: referring to Fig. 2 and Fig. 3, this combined electronic high voltage isolator is by (K
1) dynamic and static contact (1,3) and (K
2) dynamic and static contact (2,4) and insulation support pad (5), (K
2) downlead binding post (6), high-tension porcelain insulator (7), moving contact rack (8), drive link (9), switch pedestal (10) constitute.This scheme (K
2) the height of fixed contact (4) make greater than (K
1) the height or the moving contact (2) of fixed contact (3) make the height that is higher than moving contact (1), the contact of these two groups of switches totally one utmost point, so can a shared cover operating mechanism.The concrete structure of fixed contact (3,4) is looked the bus pattern decision that inserts switch.(K
2) and (K
3) moving contact (2,1) between be equipped with insulation support pad (5), this moving contact (2,1) is installed on the moving contact rack (8) through insulation support pad (5).When short switch closes a floodgate, be to drive drive link (9) motion through decelerator by motor, just can make on the moving contact rack (8) moving contact (2,1) respectively with high-tension porcelain insulator (7) on fixed contact (4,3) closure.Because fixed contact (4) is higher than (3) or moving contact (2) is higher than (1), so inevitable (K
2) prior to (K
1) closure.(K in this programme
3) adopt controllable silicon half control bridge and be connected to (K
2) the downlead binding post, schematic diagram is seen Fig. 4.Controllable silicon is from triggering mode, and its rated current and reverse breakdown voltage are all chosen by the maximum floating voltage and the maximum short circuit current that are not less than under the generator remnant magnetism state, and should leave adequate allowance.This programme is as long as by the control program travel switch (XK) of adjusting, then can guarantee (K
2) closed earlier, (K
3) conducting, (K
1) closed again, to reach protection (K
1) purpose of contact.A utmost point of considering short switch always is in the operating state that approaches zero potential, so can directly be connected on (K to the three-phase shortcircuit jumper
1) moving contact (1) on, their insulation over the ground can greatly reduce, and can make its insulating requirements be lower than the requirement of 1KV low voltage equipment.The consumption of non-ferrous metal and insulating material is all greatly reduced.This programme is a preferred plan, to (K
3) can adopt the low pressure high-speed switch of various types, to electronic high voltage isolator can doing of disconnecting link formula not only,, thereby can make the structure that is applicable to the enclosed busbar system to also can doing of first motion formula.Promptly be expected to form the construction of switch of a series of typings.This programme can utilize current production devices in general switch manufacturer, is convenient to go into operation implement.
Claims (3)
1, a kind of hydraulic generator unit electric braking short switch, by electronic high voltage isolator, low pressure high-speed switch and pressure sensitive nonlinear resistance are formed, and it is characterized in that by one group of electronic high voltage isolator (K of master
1) a utmost point and one group of auxiliary electrical dynamic high-pressure isolating switch (K
2) a utmost point be connected on the port of export (a) of generator (F) auxiliary electrical dynamic high-pressure isolating switch (K
2) another utmost point in (b) some serial connection by low pressure high-speed switch (K
3) and pressure sensitive nonlinear resistance (R
N) and connect the circuit of composition, this circuit and main electronic high voltage isolator (K
1) another utmost point be connected to (c) point, and with the three-phase short circuit.
2, short switch as claimed in claim 1 is characterized in that its main electronic high voltage isolator (K
1) and auxiliary electrical dynamic high-pressure isolating switch (K
2) can make shared operating mechanism, and mechanically guarantee synchronous combined electronic high voltage isolator, it is by main electronic high voltage isolator (K
1) dynamic and static contact (1,3) and auxiliary electrical dynamic high-pressure isolating switch (K
2) dynamic and static contact (2,4) and insulation support pad (5), auxiliary electrical dynamic high-pressure isolating switch (K
2) downlead binding post (6), high-tension porcelain insulator (7), moving contact rack (8), drive link (9), switch pedestal (10) constitute.
3, short switch as claimed in claim 1 or 2 is characterized in that making auxiliary electrical dynamic high-pressure isolating switch (K
2) in making process prior to main electronic high voltage isolator (K
1) closed fixed contact (4) makes and be higher than fixed contact (3) or moving contact (2) and make and be higher than moving contact (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201923 CN2049842U (en) | 1989-02-18 | 1989-02-18 | Short switch for electrical brake for water turbo-generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201923 CN2049842U (en) | 1989-02-18 | 1989-02-18 | Short switch for electrical brake for water turbo-generator set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2049842U true CN2049842U (en) | 1989-12-20 |
Family
ID=4859743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89201923 Withdrawn CN2049842U (en) | 1989-02-18 | 1989-02-18 | Short switch for electrical brake for water turbo-generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2049842U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534405A (en) * | 2015-03-17 | 2018-01-02 | Abb瑞士股份有限公司 | Excitation system |
-
1989
- 1989-02-18 CN CN 89201923 patent/CN2049842U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534405A (en) * | 2015-03-17 | 2018-01-02 | Abb瑞士股份有限公司 | Excitation system |
| US10658829B2 (en) | 2015-03-17 | 2020-05-19 | Abb Schweiz Ag | Excitation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |