CN203434910U - Device for eliminating generator neutral point loop resonance in startup for gas turbine power plant - Google Patents
Device for eliminating generator neutral point loop resonance in startup for gas turbine power plant Download PDFInfo
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- CN203434910U CN203434910U CN201220746349.6U CN201220746349U CN203434910U CN 203434910 U CN203434910 U CN 203434910U CN 201220746349 U CN201220746349 U CN 201220746349U CN 203434910 U CN203434910 U CN 203434910U
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- vacuum contactor
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Abstract
The utility model relates to a device for eliminating generator neutral point loop resonance in startup for a gas turbine power plant. The device is characterized in that the device includes a vacuum contactor (1-2) and two resonance eliminators (1-1); the input end of one of the resonance eliminators is connected with a neutral point of one generator, and the output end of one of the resonance eliminators is grounded, and therefore, a first resonance elimination loop is formed; the input end of the other resonance eliminator is connected with one neutral point of the other generator, and the output end of the other resonance eliminator is grounded, and therefore, a second resonance elimination loop is formed; a first pair of normally-open contacts of the vacuum contactor (1-2) is connected with two ends of one of the resonance eliminator; a second pair of normally-open contacts of the vacuum contactor (1-2) is connected with two ends of the other resonance eliminator; and a normally-closed contact of the vacuum contactor (1-2) is communicated with a generator neutral point knife switch, such that a generator neutral point knife switch linkage structure is formed. The device for eliminating the generator neutral point loop resonance in startup for the gas turbine power plant of the utility model has the advantages of simple structure, automatic switching, safety and reliability.
Description
Technical field
The utility model relates to a kind of device of eliminating generator neutral point loop resonance in dynamo-electric factory start-up course that fires.Belong to power generation industries equipment technical field.
Background technology
The dynamo-electric Chang of large-scale combustion China belongs to new type enterprise, for its design, installation China, does not have mature experience, and the design and installation of a lot of auxiliary devices is all to carry out with reference to traditional coal-burning power plant.Wherein in generator neutral point loop, just directly adopted the design of coal-burning power plant.In traditional coal-burning power plant, the frequency of generator is constant 50Hz.In LNG variable load plant, because SFC is static frequency change equipment, it is that generator adopts the infinite variable speed mode of adjustable frequency motor to move that combustion machine starts, in start-up course, generator bears dragging from 0Hz to 33.3Hz variable frequency power supply, when the inductance of voltage transformer and the natural resonance frequency of the LC resonant tank that distributed capacitance forms over the ground such as generator, cable equate with the output frequency (or frequency division or frequency multiplication) in certain moment in SFC start-up course, in the loops such as voltage transformer, will there is parallel resonance phenomenon.The size of resonance potential is relevant with the quality factor q in LC loop, and because ferro resonance voltage is very high, the transient overvoltage in voltage transformer can cause moment magnetic saturation phenomenon, and therefore, resonance potential waveform can be again nonlinear, so there is again high-order harmonic generation.Because high order harmonic component has very strong penetration capacity, its destructiveness is very large, makes the change of motor generating period rotating speed and vibration, affects delivery efficiency and sends noise.In addition, engine copper loss and iron loss will increase, and even occur superheating phenomenon, reduction of service life.
Utility model content
The purpose of this utility model, is in order to solve above-mentioned prior art problem, and a kind of device of eliminating generator neutral point loop resonance in dynamo-electric factory start-up course that fires is provided.Described device has simple in structure, safe and reliable, can eliminate generator resonance situation, guarantees the feature of equipment safety operation.
The purpose of this utility model can reach by the following technical programs:
Fire the device of eliminating generator neutral point loop resonance in dynamo-electric factory start-up course, its design feature is: comprise resonance eliminator and vacuum contactor, one of input of resonance eliminator is connected with generator neutral point, output head grounding, form the first harmonic elimination loop, two of the input of resonance eliminator is connected with another neutral point of generator, output head grounding, form the second harmonic elimination loop, first pair of normally opened contact of vacuum contactor is connected to the two ends of resonance eliminator, and second pair of normally opened contact is connected to the two ends of another resonance eliminator.Described vacuum contactor contact and the interlock of generator neutral point disconnecting link.
The purpose of this utility model can reach by the following technical programs:
A kind of Technological improvement plan of the present utility model is: described resonance eliminator comprises external high-tension cable, seal cover, High-Voltage Insulation overcoat and base, described high pressure overcoat cavity is provided with current-limting fuse, current-limting fuse upper end is connecting conductive electrode, conductive electrode is connecting external high-tension cable by seal cover with wire, the bottom of cavity is provided with two groups of current limiting elements, two groups of current limiting element lower ends are all connecting grounding electrode, upper end all connects current-limting fuse with wire, quartz sand is filled in gap between current-limting fuse and current limiting element and High-Voltage Insulation overcoat, the top of High-Voltage Insulation overcoat is press-fiting seal cover, the bottom of High-Voltage Insulation overcoat is installed with base, base is provided with installing hole.
A kind of Technological improvement plan of the present utility model is: described two groups of current limiting elements adopt controllable silicon material, and four every group 5KW 200A controllable silicons form with controllable silicon chain; The wherein operating current direction of a group of described two groups of current limiting elements is that conductive electrode flows to grounding electrode, and the operating current direction of another group is that ground connection water conservancy diversion is to conductive electrode.
The utlity model has following outstanding beneficial effect:
1, the utility model is owing to resonance eliminator being serially connected in to the neutral point of generator, form two harmonic elimination loops, road, vacuum contactor contact and resonance eliminator are connected in parallel, and the disconnecting link of vacuum contactor and the interlock of generator neutral point grounding switch, when starting, passes through by generator the generation of resonance eliminator Eliminate highter harmonic, start rear automatic short-circuit and stopped resonance eliminator work, therefore, there is simple in structure, automatic switchover and safe and reliable beneficial effect.
2, the utility model, owing to increasing loop resistance in generator neutral point loop, specifically seals in harmonic elimination apparatus in the LC of generator neutral point series resonant tank, with endergonic method, stops resonance occurs; The harmonic elimination apparatus sealing in LC series resonant tank has high power capacity nonlinear resistor structure, therefore, by install harmonic elimination apparatus additional in generator neutral point loop, has destroyed the condition of resonance in start-up course, has guaranteed the safe operation of equipment.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the utility model 1 application structure schematic diagram.
Fig. 2 is the structural representation of the resonance eliminator of the utility model specific embodiment 1.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, the present embodiment comprises vacuum contactor 1-2 and two device resonance eliminator 1-1, and the input of one of resonance eliminator is connected with the neutral point of a generator, output head grounding, forms the first harmonic elimination loop; Two input of resonance eliminator is connected with the neutral point of another generator, output head grounding, forms the second harmonic elimination loop; First pair of normally opened contact of vacuum contactor 1-2 is connected to the two ends of one of resonance eliminator, second pair of normally opened contact of vacuum contactor 1-2 is connected to two two ends of resonance eliminator, and the normally-closed contact of vacuum contactor 1-2 is communicated with, forms generator neutral point disconnecting link linkage structure with generator neutral point disconnecting link.
With reference to Fig. 2, described resonance eliminator 1-1 comprises external high-tension cable 2, seal cover 3, High-Voltage Insulation overcoat 7 and base 9, described High-Voltage Insulation overcoat cavity is provided with current-limting fuse 5, current-limting fuse upper end is connecting conductive electrode 4, conductive electrode 4 is connecting external high-tension cable 2 by seal cover 3 use wires, the bottom of cavity is provided with two groups of current limiting elements 11, two groups of current limiting element 11 lower ends are all connecting grounding electrode 10, upper end all connects current-limting fuse 5 with wire, quartz sand 6 is filled in gap between current-limting fuse 5 and current limiting element 11 and High-Voltage Insulation overcoat 7, the top of High-Voltage Insulation overcoat 7 is press-fiting seal cover 3.Wherein, two groups of current limiting elements 11 adopt controllable silicon material, and four every group 5KW 200A controllable silicons form with controllable silicon chain 8; The wherein operating current direction of a group of described two groups of current limiting elements 10 is that conductive electrode 4 flows to grounding electrode 10, and the operating current direction of another group is that grounding electrode 10 flows to conductive electrode 4.
For firing the method that dynamo-electric factory start-up course is eliminated generator neutral point loop resonance, it is characterized in that:
1) in generator neutral point loop, increase loop resistance, specifically in the LC of generator neutral point series resonant tank, seal in harmonic elimination apparatus, with endergonic method, stop resonance occurs;
2) harmonic elimination apparatus sealing in LC series resonant tank has high power capacity nonlinear resistor structure, has the ferro resonance that elimination or damping are caused by voltage transformer, avoids the function of the inside and outside insulation breakdown of voltage transformer, electric discharge; Can when single-phase earthing or arc grounding, flow through the overcurrent of instrument transformer winding by restriction system, avoid voltage transformer to burn; Can deboost instrument transformer ferro resonance.
In the method for the elimination generator neutral point loop resonance of the present embodiment, the harmonic elimination apparatus being serially connected in LC series resonant tank is nonlinear resistance harmonic elimination damping structure, be arranged on a winding of voltage transformer, in the time of effectively suppressing intermittence arc grounding, flow through the overcurrent of winding; What restriction system single-phase earthing produced while disappearing in a winding loop shoves; Prevent device damage.Neutral point at generator 1PT, 2PT respectively installs a set of harmonic elimination apparatus additional, the neutrality of generator 1PT, 2PT ground connection after harmonic elimination apparatus, and between the high and low pressure of harmonic elimination apparatus by-pass switch in parallel; By by-pass switch in parallel, harmonic elimination apparatus and generator neutral point disconnecting link are linked, realize harmonic elimination apparatus " input " or " exiting " automatically; When generator neutral point disconnecting link separating brake (rise machine), interlock harmonic elimination apparatus is thrown and is backed out pass separating brake, drops into harmonic elimination apparatus; When generator neutral point disconnecting link closes a floodgate (rising after machine), interlock resonance eliminator is thrown to back out to close and is closed a floodgate, and exits harmonic elimination apparatus.
The operation principle of the present embodiment:
The above; it is only preferably specific embodiment of the utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the scope that the utility model discloses; according to the technical solution of the utility model and utility model design thereof, be equal to replacement or changed, all being belonged to protection range of the present utility model.
Claims (3)
1. the device of generator neutral point loop resonance is eliminated by the dynamo-electric factory of combustion in starting, it is characterized in that: comprise vacuum contactor (1-2) and two resonance eliminators (1-1), the input of one of resonance eliminator is connected with the neutral point of a generator, output head grounding, forms the first harmonic elimination loop; Two input of resonance eliminator is connected with the neutral point of another generator, output head grounding, forms the second harmonic elimination loop; First pair of normally opened contact of vacuum contactor (1-2) is connected to the two ends of one of resonance eliminator, second pair of normally opened contact of vacuum contactor (1-2) is connected to two two ends of resonance eliminator, and the normally-closed contact of vacuum contactor (1-2) is communicated with, forms generator neutral point disconnecting link linkage structure with generator neutral point disconnecting link.
2. the device of generator neutral point loop resonance is eliminated by the dynamo-electric factory of combustion according to claim 1 in starting, it is characterized in that: described resonance eliminator (1-1) comprises external high-tension cable (2), seal cover (3), High-Voltage Insulation overcoat (7) and base (9), described High-Voltage Insulation overcoat cavity is provided with current-limting fuse (5), current-limting fuse upper end is connecting conductive electrode (4), conductive electrode (4) is connecting external high-tension cable (2) by seal cover (3) with wire, the bottom of cavity is provided with two groups of current limiting elements (11), two groups of current limiting elements (11) lower end is all connecting grounding electrode (10), upper end all connects current-limting fuse (5) with wire, quartz sand (6) is filled in gap between current-limting fuse (5) and current limiting element (11) and High-Voltage Insulation overcoat (7), the top of High-Voltage Insulation overcoat (7) is press-fiting seal cover (3).
3. the device of generator neutral point loop resonance is eliminated by the dynamo-electric factory of combustion according to claim 2 in starting, it is characterized in that: described two groups of current limiting elements (11) adopt controllable silicon material, four every group 5KW 200A controllable silicons form with controllable silicon chain (8); The wherein operating current direction of a group of described two groups of current limiting elements (10) is that conductive electrode (4) flows to grounding electrode (10), and the operating current direction of another group is that grounding electrode (10) flows to conductive electrode (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220746349.6U CN203434910U (en) | 2012-12-30 | 2012-12-30 | Device for eliminating generator neutral point loop resonance in startup for gas turbine power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220746349.6U CN203434910U (en) | 2012-12-30 | 2012-12-30 | Device for eliminating generator neutral point loop resonance in startup for gas turbine power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203434910U true CN203434910U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220746349.6U Expired - Fee Related CN203434910U (en) | 2012-12-30 | 2012-12-30 | Device for eliminating generator neutral point loop resonance in startup for gas turbine power plant |
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| Country | Link |
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| CN (1) | CN203434910U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509846A (en) * | 2020-10-20 | 2021-03-16 | 国网江苏省电力有限公司盐城供电分公司 | Electric grounding control device of switch cabinet harmonic eliminator |
-
2012
- 2012-12-30 CN CN201220746349.6U patent/CN203434910U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509846A (en) * | 2020-10-20 | 2021-03-16 | 国网江苏省电力有限公司盐城供电分公司 | Electric grounding control device of switch cabinet harmonic eliminator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20161230 |