CN101799518B - Online monitoring and grounding protection methods of insulation of generator stator core tightening screw rods - Google Patents
Online monitoring and grounding protection methods of insulation of generator stator core tightening screw rods Download PDFInfo
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- CN101799518B CN101799518B CN2010101063635A CN201010106363A CN101799518B CN 101799518 B CN101799518 B CN 101799518B CN 2010101063635 A CN2010101063635 A CN 2010101063635A CN 201010106363 A CN201010106363 A CN 201010106363A CN 101799518 B CN101799518 B CN 101799518B
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Abstract
The invention discloses a plurality of online monitoring and grounding protection methods of the insulation of generator stator core tightening screw rods, belonging to the methods for preventing generator stators from generating faults and aiming at providing a plurality of methods for monitoring the insulated status of the tightening screw rods at the real time. The method comprises the following steps of: sequentially numbering the tightening screw rods, and connecting a stator core and all tightening screw rods into a monitoring device through outgoing lines; calculating an insulated resistance value between each tightening screw rod and the core according to voltages applied between each tightening screw rod and the core and currents acquired from the tightening screw rods, or according to acquired induced voltages between the stator core and each tightening screw rod; comparing and judging the insulated resistance values or the induced voltages with preset resistance values or preset voltage setting values, issuing an alarm signal and displaying the number of the faulted tightening screw rods. The invention can ensure the safety operation of a generator, reduces the searching time of fault points, improves the economic benefits of generating plants and is an ideal method for preventing the generator stator core tightening screw rods from generating faults.
Description
Technical field: the present invention relates to the method for several kinds of protection generators, relate in particular to the method that several kinds of prevention electricity generator stator cores break down.
Background technology: well-known, for fastening electricity generator stator core lamination and in order to reduce the stator core loss, adopt stretching screw to fix core lamination stack mostly in the inside of many electricity generator stator cores; Burn out stator core for fear of stretching screw ground connection, the necessary and stator core insulation of stretching screw.But in the generator operation process, stator core can contact because of the influence of factors such as unit vibration, dust accretions with stretching screw and cause short circuit, and the causes current increase burns out stator core, causes heavy losses.At present, owing to can not carry out on-line monitoring and ground protection to the insulation status between stretching screw and the stator core; For fear of above-mentioned fault takes place, all be to utilize the gap of shutting down maintenance that the insulation status of all stretching screws is carried out manual detection usually.Yet,, therefore have many defectives such as workload is big, efficient is low, detection time is long because stretching screw quantity is more; In addition,, only when generator operation, just can come out, therefore exist hidden danger such as omission, flase drop, generator safe operation to can not get ensureing because some failure ratio is more hidden.
Summary of the invention: to the above-mentioned defective that exists in the prior art; The present invention aims to provide several kinds of insulation of generator stator core tightening screw rods on-line monitoring localization methods; Utilize the inventive method can monitor the insulation status of stretching screw in real time, even the position of definite fault screw rod.
To achieve these goals, several kinds of technical schemes below the present invention adopts:
Scheme one comprises data acquisition, data operation, logic determines and warning output; Concrete grammar is:
1) with the stretching screw serial number of electricity generator stator core, stator core is electrically connected with monitoring device through the screw rod extension line respectively through iron core extension line, each stretching screw;
2) monitoring device is calculated each stretching screw respectively with respect to the insulation resistance value between the stator core according to the electric current on each stretching screw that is applied to the voltage between each screw rod extension line and the iron core extension line respectively and gathers in real time, is shown on the screen;
3) monitoring device compares each insulation resistance value and preset setting valve, if the insulation resistance value of certain root stretching screw is less than this setting valve, monitoring device sends alerting signal, and shows the sequence number of this stretching screw automatically.
Scheme two comprises data acquisition, logic determines and warning output; Concrete grammar is:
1) with the stretching screw serial number of electricity generator stator core, stator core is electrically connected with monitoring device through the screw rod extension line respectively through iron core extension line, each stretching screw;
2) monitoring device is gathered the induced voltage between each stretching screw and the stator core in real time, is shown on the screen;
3) monitoring device compares each induced voltage and preset setting valve, if the induced voltage of certain root stretching screw departs from this setting valve, monitoring device sends alerting signal, and shows the sequence number of this stretching screw automatically.
Scheme three comprises data acquisition, logic determines and warning output; Concrete grammar is:
1) stator core inserts monitoring device by the iron core extension line, and each stretching screw is respectively by being electrically connected with monitoring device after the parallel connection of screw rod extension line again;
2) monitoring device is calculated all stretching screws with respect to the total insulation resistance value between the stator core according to the voltage and the loop total current of gathering in real time that are applied between screw rod extension line and the iron core extension line, is shown on the screen;
3) monitoring device compares this total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal.
In order to prevent that the screw rod extension line from breaking down and cause the stretching screw ground short circuit, on the basis of above-mentioned three technical schemes, can also between each stretching screw and its extension line, be connected the preferred version of resistance as above-mentioned three technical schemes.
Scheme four comprises data acquisition, logic determines and warning output; Concrete grammar is:
1) stator core inserts monitoring device by the iron core extension line, connects each stretching screw with the screw rod extension line that monitoring device is electrically connected successively in the head and the tail two ends;
2) monitoring device is according to the loop current that is applied between screw rod extension line head end and the iron core extension line, perhaps is applied to the voltage between screw rod extension line tail end and the iron core extension line and gathers in real time; Calculate all stretching screws with respect to the total insulation resistance value between the stator core, be shown on the screen;
3) monitoring device compares this total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal.
In like manner; In order to prevent that the screw rod extension line from breaking down and cause the stretching screw ground short circuit; On the basis of scheme four, can be between adjacent stretching screw series resistor, respectively be connected to resistance between first stretching screw and its extension line and between the stretching screw at end and its extension line.
Scheme five comprises data acquisition, logic determines and warning output; Concrete grammar is:
1) with the stretching screw serial number of electricity generator stator core; Stator core inserts monitoring device by the iron core extension line; Connecting each stretching screw with the screw rod extension line that monitoring device is electrically connected through resistance respectively successively in the head and the tail two ends, is connected to substitutional resistance between the adjacent stretching screw;
2) monitoring device applies voltage according to being applied between the screw rod extension line initial and end end; The insulation resistance that obtains stretching screw through monitoring device intercycle switching controls calculates formula and ground connection relative positioning formula, calculates all stretching screws thus with respect to total insulation resistance value between the stator core and ground connection relative positioning value;
3) monitoring device compares total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal; With this simultaneously, monitoring device is according to the quantity of stretching screw and the relation of sequence number and relative positioning value, calculates the sequence number of ground connection stretching screw and is shown on the screen.
With prior art relatively, the inventive method has been owing to adopted above-mentioned several kinds of technical schemes, eliminated thoroughly that the traditional detection method workload is big, efficient is low, detection time is long and defective that omission, flase drop etc. can't overcome; Wherein, Scheme one, scheme two and scheme five not only can the on-line monitoring stretching screw insulation status; But also can judge any root stretching screw generation ground short circuit, and can either guarantee the security of operation of generator, reduced the trouble spot again and searched the time, improved the economic benefit of power plant.
Description of drawings:
Fig. 1 is the generator unit stator of the embodiment of the invention 1,2 and the annexation synoptic diagram of monitoring device;
Fig. 2 is the generator unit stator of the embodiment of the invention 3 and the annexation synoptic diagram of monitoring device;
Fig. 3 is the generator unit stator of the embodiment of the invention 4,5 and the annexation synoptic diagram of monitoring device.
Among the figure: stator core 1 screw rod extension line 2 stretching screws 3 monitoring devices 4 iron core extension lines 5 resistance 6
Embodiment: several kinds of schemes of the present invention are described further below in conjunction with accompanying drawing and specific embodiment:
Embodiment 1
1) as shown in Figure 1, to stretching screw 3 serial numbers of electricity generator stator core 1, the stator core 1 that is connected with the earth is electrically connected with monitoring device 4 through iron core extension line 5, and each stretching screw 3 is electrically connected with monitoring device 4 through screw rod extension line 2 respectively;
2) monitoring device 4 is calculated each stretching screw 3 respectively with respect to the insulation resistance value between the stator core 1 according to the electric current on each stretching screw 3 that is applied to the voltage between each stretching screw 3 and the iron core extension line 5 respectively and gathers in real time, is shown on the screen;
3) monitoring device 4 compares each insulation resistance value and predefined resistance setting valve, if the insulation resistance value of certain root stretching screw 3 is less than this resistance setting valve, 4 of monitoring devices send alerting signal, and show the sequence number of this stretching screw 3 automatically.
1) as shown in Figure 1, to stretching screw 3 serial numbers of electricity generator stator core 1, the stator core 1 that is connected with the earth is electrically connected with monitoring device 4 through iron core extension line 5, and each stretching screw 3 is electrically connected with monitoring device 4 through screw rod extension line 2 respectively;
2) monitoring device 4 is gathered the induced voltage between each stretching screw 3 and the stator core 1 in real time, is shown on the screen;
3) monitoring device 4 compares each induced voltage and predefined voltage setting valve, if the induced voltage of certain root stretching screw 3 departs from this voltage setting valve, 4 of monitoring devices send alerting signal, and show the sequence number of this stretching screw 3 automatically.
1) as shown in Figure 2, stator core 1 directly is electrically connected with monitoring device 4 through iron core extension line 5; Each stretching screw 3 is drawn by screw rod extension line 2 respectively, through being electrically connected with monitoring device 4 after the lead parallel connection again;
2) monitoring device 4 is calculated all stretching screws with respect to the total insulation resistance value between the stator core according to the total current in the loop that is applied to the voltage between screw rod extension line 2 and the iron core extension line 5 and gathers in real time, is shown on the screen;
3) monitoring device 4 should total insulation resistance value and predefined resistance setting valve compare, if total insulation resistance value is less than this resistance setting valve, 4 of monitoring devices send alerting signal.
Cause stretching screw 3 ground short circuits in order to prevent screw rod extension line 2 from breaking down, respectively on the basis of above-mentioned each embodiment, can also between each stretching screw 3 and its extension line, be connected resistance 6.
1) as shown in Figure 3, stator core 1 directly inserts monitoring device 4 by iron core extension line 5, and with each stretching screw 3 series connection, monitoring device 4 is inserted at the head and the tail two ends of screw rod extension line 2 to screw rod extension line 2 successively;
2) monitoring device 4 is according to the loop current that is applied to the voltage between screw rod extension line 2 head ends and the iron core extension line 5 and gathers in real time; Perhaps according to the loop current that is applied to the voltage between screw rod extension line 2 tail ends and the iron core extension line 5 and gathers in real time; Calculate all stretching screws 3 with respect to the total insulation resistance value between the stator core 1, be shown on the screen;
3) monitoring device 4 should total insulation resistance value and predefined resistance setting valve compare, if total insulation resistance value is less than this resistance setting valve, monitoring device 4 sends alerting signal.
In like manner; Cause stretching screw 3 ground short circuits in order to prevent screw rod extension line 2 from breaking down; On the basis of present embodiment; Can between adjacent stretching screw 3, connect resistance 6, between first stretching screw 3 and monitoring device 4 and between the stretching screw 3 at end and monitoring device 4, respectively be connected resistance 6.
1) as shown in Figure 3, with stretching screw 3 serial numbers of electricity generator stator core 1, stator core 1 directly inserts monitoring device by iron core extension line 5, and with each stretching screw 3 series connection, monitoring device 4 is inserted at the head and the tail two ends of screw rod extension line 2 to screw rod extension line 2 successively; Wherein, respectively be connected to resistance 6 being connected between the adjacent stretching screw between 6, the first stretching screws 3 of resistance and the monitoring device 4 and between the stretching screw 3 at end and the monitoring device 4, the resistance of each resistance 6 equates;
2) monitoring device 4 is according to applying voltage between head end that is applied to screw rod extension line 2 and the tail end; The insulation resistance that obtains stretching screw 3 through 4 intercycle of monitoring device switching controls calculates formula and ground connection relative positioning formula, calculates all stretching screws 3 thus with respect to total insulation resistance value between the stator core 1 and ground connection relative positioning value;
3) monitoring device 4 compares total insulation resistance value and predefined resistance setting valve, if always insulation resistance value is less than this resistance setting valve, 4 of monitoring devices send alerting signal; With this simultaneously, monitoring device 4 is according to the quantity of stretching screw 3 and the relation of sequence number and relative positioning value, calculates the sequence number of ground connection stretching screw 3 and is shown on the screen.
Claims (9)
1. insulation of generator stator core tightening screw rods on-line monitoring and earthing protecting method comprise data acquisition, data operation, logic determines and warning output; It is characterized in that:
1) with the stretching screw serial number of electricity generator stator core, stator core is electrically connected with monitoring device through the screw rod extension line respectively through iron core extension line, each stretching screw;
2) monitoring device is calculated each stretching screw respectively with respect to the insulation resistance value between the stator core according to the electric current on each stretching screw that is applied to the voltage between each screw rod extension line and the iron core extension line respectively and gathers in real time, is shown on the screen;
3) monitoring device compares each insulation resistance value and preset setting valve, if the insulation resistance value of certain root stretching screw is less than this setting valve, monitoring device sends alerting signal, and shows the sequence number of this stretching screw automatically.
2. insulation of generator stator core tightening screw rods on-line monitoring according to claim 1 and earthing protecting method is characterized in that: between each stretching screw and its extension line, be connected to the resistance that resistance equates.
3. insulation of generator stator core tightening screw rods on-line monitoring and earthing protecting method comprise data acquisition, logic determines and warning output; It is characterized in that:
1) with the stretching screw serial number of electricity generator stator core, stator core is electrically connected with monitoring device through the screw rod extension line respectively through iron core extension line, each stretching screw;
2) monitoring device is gathered the induced voltage between each stretching screw and the stator core in real time, is shown on the screen;
3) monitoring device compares each induced voltage and preset setting valve, if the induced voltage of certain root stretching screw departs from this setting valve, monitoring device sends alerting signal, and shows the sequence number of this stretching screw automatically.
4. insulation of generator stator core tightening screw rods on-line monitoring according to claim 3 and earthing protecting method is characterized in that: between each stretching screw and its extension line, be connected to the resistance that resistance equates.
5. insulation of generator stator core tightening screw rods on-line monitoring and earthing protecting method comprise data acquisition, data operation, logic determines and warning output; It is characterized in that:
1) stator core inserts monitoring device by the iron core extension line, and each stretching screw is respectively by being electrically connected with monitoring device after the parallel connection of screw rod extension line again;
2) monitoring device is calculated all stretching screws with respect to the total insulation resistance value between the stator core according to the voltage and the loop total current of gathering in real time that are applied between screw rod extension line and the iron core extension line, is shown on the screen;
3) monitoring device compares this total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal.
6. insulation of generator stator core tightening screw rods on-line monitoring according to claim 5 and earthing protecting method is characterized in that: between each stretching screw and its extension line, be connected to the resistance that resistance equates.
7. insulation of generator stator core tightening screw rods on-line monitoring and earthing protecting method comprise data acquisition, data operation, logic determines and warning output; It is characterized in that:
1) stator core inserts monitoring device by the iron core extension line, and with each stretching screw series connection, monitoring device is inserted at the head and the tail two ends of this screw rod extension line to the screw rod extension line successively;
2) monitoring device is according to the loop current that is applied between screw rod extension line head end and the iron core extension line, perhaps is applied to the voltage between screw rod extension line tail end and the iron core extension line and gathers in real time; Calculate all stretching screws with respect to the total insulation resistance value between the stator core, be shown on the screen;
3) monitoring device compares this total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal.
8. insulation of generator stator core tightening screw rods on-line monitoring according to claim 7 and earthing protecting method is characterized in that: series resistor between adjacent stretching screw; Respectively be connected to the resistance that resistance equates between first stretching screw and its extension line and between the stretching screw at end and its extension line.
9. insulation of generator stator core tightening screw rods on-line monitoring and earthing protecting method comprise data acquisition, data operation, logic determines and warning output; It is characterized in that:
1) with the stretching screw serial number of electricity generator stator core, stator core inserts monitoring device by the iron core extension line, and with each stretching screw series connection, monitoring device is inserted at the head and the tail two ends of this screw rod extension line to the screw rod extension line successively; Wherein, be connected to resistance between each adjacent stretching screw, between first stretching screw and the monitoring device and be connected to resistance between last root stretching screw and the monitoring device, each resistance equates;
2) monitoring device applies voltage according to being applied between the screw rod extension line initial and end end; The insulation resistance that obtains stretching screw through monitoring device intercycle switching controls calculates formula and ground connection relative positioning formula, calculates all stretching screws thus with respect to total insulation resistance value between the stator core and ground connection relative positioning value;
3) monitoring device compares total insulation resistance value and preset setting valve, if always insulation resistance value is less than this setting valve, monitoring device sends alerting signal; With this simultaneously, monitoring device is according to the quantity of stretching screw and the relation of sequence number and relative positioning value, calculates the sequence number of ground connection stretching screw and is shown on the screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101063635A CN101799518B (en) | 2010-02-05 | 2010-02-05 | Online monitoring and grounding protection methods of insulation of generator stator core tightening screw rods |
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| CN2010101063635A CN101799518B (en) | 2010-02-05 | 2010-02-05 | Online monitoring and grounding protection methods of insulation of generator stator core tightening screw rods |
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| CN101799518B true CN101799518B (en) | 2012-07-04 |
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| CN103163433A (en) * | 2013-03-05 | 2013-06-19 | 贵阳新光电气有限公司 | Method for monitoring insulation condition of generator stator and power distribution network on line and performing fault line selection |
| CN106772039B (en) * | 2016-12-15 | 2019-05-21 | 华北电力大学（保定） | Turn-to-turn short circuit of rotor winding of automobile turbine generator diagnostic method based on core through screw rod |
| CN106443318B (en) * | 2016-12-15 | 2019-06-18 | 华北电力大学（保定） | Hydraulic generator rotor winding interturn short-circuit diagnostic method based on core through screw rod |
| CN106772038A (en) * | 2016-12-15 | 2017-05-31 | 华北电力大学（保定） | Synchronous generator rotor winding interturn short-circuit diagnostic method based on twin-screw |
| CN106771820B (en) * | 2017-01-10 | 2021-02-19 | 华北电力大学（保定） | Method for monitoring short circuit fault of stator core and feed-through screw of synchronous generator |
| CN111965498B (en) * | 2020-07-22 | 2023-01-24 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
| CN113484548A (en) * | 2021-06-07 | 2021-10-08 | 中国长江电力股份有限公司 | Tensioning screw insulation measuring device and measuring method thereof |
| CN114660504B (en) * | 2022-04-08 | 2023-07-07 | 东方电气集团东方电机有限公司 | Insulation monitoring loop detection method and device, electronic equipment and storage medium |
| CN114740266B (en) * | 2022-04-08 | 2023-06-13 | 东方电气集团东方电机有限公司 | Insulation monitoring method, device, electronic equipment and storage medium |
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