CN207398820U - Generator unit stator one-phase ground protection device - Google Patents
Generator unit stator one-phase ground protection device Download PDFInfo
- Publication number
- CN207398820U CN207398820U CN201721571289.8U CN201721571289U CN207398820U CN 207398820 U CN207398820 U CN 207398820U CN 201721571289 U CN201721571289 U CN 201721571289U CN 207398820 U CN207398820 U CN 207398820U
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- China
- Prior art keywords
- generator
- triple
- frequency harmonics
- stator
- phase ground
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- Expired - Fee Related
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- 238000004804 winding Methods 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses a kind of generator unit stator one-phase ground protection device, including components such as generator, transformer, No.1 triple-frequency harmonics pass filter, No. two triple-frequency harmonics pass filters, LF wave filters and stator grounding relays.Wherein, the outlet 6.3kV sides residual voltage of generator via be used as after No.1 triple-frequency harmonics pass filter and LF wave filters momentum input stator grounding relay in; influence when high voltage side of transformer is grounded in order to prevent to low-pressure side; the outlet 35kV sides residual voltage of generator is also input to as braking amount in stator grounding relay by the utility model, to reduce the setting valve of protection.By experiment, voltage value can be adjusted in below 10V, it can be achieved that 95% scope more than one-phase ground protection of generator unit stator winding in actual motion.The utility model considerably reduces dead zone existing for protection, while improves the sensitivity of generator unit stator one-phase ground protection.
Description
Technical field
The utility model is related to a kind of generator unit stator one-phase ground protection devices.
Background technology
Generator stator winding single-phase earthing is generator the most common type electric fault.Stator single-phase grounding fault
Harmfulness be mainly flow through trouble point capacitance current generate electric arc may burn out stator core, further result in turn-to-turn short circuit
Or phase fault, make generator by even more serious destruction.Therefore, a set of reliable and sensitive one-phase ground protection dress is possessed
It puts, becomes the key for eliminating this electric fault.Common one-phase ground protection device includes third harmonic voltage type, zero sequence electricity
Flow pattern etc..Due to residual voltage type due to its wiring it is simple, easy to maintain, reliable the advantages that, still in Pump for Medium and Small Power Generating Set
Extensive use.Therefore, residual voltage type one-phase ground protection is analyzed and improved, still there is realistic meaning.Residual voltage type
The basic principle of one-phase ground protection is to obtain residual voltage from machine potential transformer open-delta side draw, access protection
Over voltage relay.But in fact, generator is under normal operating conditions, there are third harmonic voltages in phase voltage；In addition,
High voltage side of transformer occur ground short circuit when, due between transformer high-low-voltage winding with the presence of capacitance, generator generator terminal
Residual voltage can be generated.In order to ensure the selectivity of protection act, the setting valve of protection should avoid above-mentioned third harmonic voltage with
Residual voltage.According to operating experience, voltage value is generally adjusted between 15-20V.After being adjusted by this value, due to close to neutral point
When earth fault nearby occurs, residual voltage is low, and protection may not start, so the protection domain of kind protection is about by generator terminal
To 80% or so of neutral point winding, there are dead zones for protection.It can be seen that existing generator unit stator one-phase ground protection device
It requires further improvement.
Utility model content
For the above-mentioned technical problems in the prior art, connect the utility model proposes a kind of generator unit stator is single-phase
Ground protective device to reduce dead zone existing for protection, while improves the sensitivity of protection.
The utility model to achieve these goals, adopts the following technical scheme that：
Generator unit stator one-phase ground protection device, including generator, transformer, No.1 triple-frequency harmonics pass filter, No. two
Triple-frequency harmonics pass filter, LF wave filters and stator grounding relay；Wherein, transformer is installed on the outlet 6.3kV sides of generator
Between the outlet 35kV sides of generator；The outlet 6.3kV sides of generator are connected with the input terminal of No.1 triple-frequency harmonics pass filter,
The output terminal of No.1 triple-frequency harmonics pass filter is connected with the input terminal of LF wave filters, the output terminals of LF wave filters and stator grounding after
The input terminal connection of electric appliance；The outlet 35kV sides of generator are connected with the input terminal of No. two triple-frequency harmonics pass filters, No. two
The output terminal of triple-frequency harmonics pass filter is connected with another input terminal of stator grounding relay.
The utility model has the following advantages that：
The generator unit stator one-phase ground protection device that the utility model is addressed, including generator, transformer, No.1 three times
The components such as harmonic wave pass filter, No. two triple-frequency harmonics pass filters, LF wave filters and stator grounding relay.Wherein, generator goes out
Mouthful 6.3kV side residual voltages are via be used as momentum input stator grounding relay after No.1 triple-frequency harmonics pass filter and LF wave filters
In device, influence when high voltage side of transformer is grounded in order to prevent to low-pressure side, the utility model is also by the outlet 35kV of generator
Side residual voltage is input to as braking amount in stator grounding relay, to reduce the setting valve of protection.It is actual to transport by experiment
Voltage value can be adjusted in below 10V, it can be achieved that 95% scope more than one-phase ground protection of generator unit stator winding in row.
Description of the drawings
Fig. 1 is the structure diagram of generator unit stator one-phase ground protection device in the utility model；1- generators, 2- transformations
Device, 3- No.1 triple-frequency harmonics pass filters；No. bis- triple-frequency harmonics pass filters of 4-, 5-LF wave filters, 6- stator grounding relays.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail the utility model：
With reference to shown in Fig. 1, generator unit stator one-phase ground protection device is humorous three times including generator 1, transformer 2, No.1
3, No. two triple-frequency harmonics pass filters 4 of ripple pass filter, LF wave filters 5 and stator grounding relay 6.
Wherein, transformer 2 is installed between the outlet 6.3kV sides of generator and the outlet 35kV sides of generator.
The outlet 6.3kV sides of generator 2 are connected with the input terminal of No.1 triple-frequency harmonics pass filter 3, the filter of No.1 triple-frequency harmonics
The output terminal for crossing device 3 is connected with the input terminal of LF wave filters 5.
The output terminal of LF wave filters 5 is connected with an input terminal of stator grounding relay 6.The outlet 6.3kV of generator
Side residual voltage after No.1 triple-frequency harmonics pass filter and LF wave filters via being used as in momentum input stator grounding relay 6.
The outlet 35kV sides of generator are connected with the input terminal of No. two triple-frequency harmonics pass filters 4, No. two triple-frequency harmonics filtrations
The output terminal of device 4 is connected with another input terminal of stator grounding relay 6.
By regarding above-mentioned 35kV sides residual voltage as braking amount, the setting valve of protection can be reduced.
The utility model considerably reduces dead zone existing for protection, while improves the spirit of generator unit stator one-phase ground protection
Quick property.
In addition, the one-phase ground protection device in the utility model further includes audible-visual annunciator.
It in the case of having ground connection, will not trip immediately, but carry out sound-light alarm first, after electrical personnel have found ground connection
It is checked oneself, while is contacted with substation operator on duty first, disconnect ground path, protection generator is without damage.
The utility model ensures generator in a short time from stop jumping under the failure of 6.3kV busbar external grounds, and energy
Enough so that generator unit stator one-phase ground protection device plays a protective role to generator.
In addition, the one-phase ground protection device in the utility model further includes wireless transport module, carried out in electrical personnel
While checking oneself, which can be wirelessly transmitted in substation, improve the real-time of information transmission.
Certainly, the preferred embodiment of only the utility model described above, the utility model is not limited to enumerate above-mentioned
Embodiment, it should be noted that for any those skilled in the art under the introduction of this specification, that is made is all etc.
With replacement, apparent variant, all fall within the essential scope of this specification, ought to be protected be subject to the utility model.
Claims (1)
1. generator unit stator one-phase ground protection device, which is characterized in that including generator, transformer, the filter of No.1 triple-frequency harmonics
Cross device, No. two triple-frequency harmonics pass filters, LF wave filters and stator grounding relay；Wherein, transformer is installed on going out for generator
Between mouth 6.3kV sides and the outlet 35kV sides of generator；The outlet 6.3kV sides of generator are defeated with No.1 triple-frequency harmonics pass filter
Enter end be connected, the output terminal of No.1 triple-frequency harmonics pass filter is connected with the input terminal of LF wave filters, the output terminal of LF wave filters and
The input terminal connection of stator grounding relay；The outlet 35kV sides of generator and the input terminal of No. two triple-frequency harmonics pass filters
It is connected, the output terminal of No. two triple-frequency harmonics pass filters is connected with another input terminal of stator grounding relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721571289.8U CN207398820U (en) | 2017-11-22 | 2017-11-22 | Generator unit stator one-phase ground protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721571289.8U CN207398820U (en) | 2017-11-22 | 2017-11-22 | Generator unit stator one-phase ground protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207398820U true CN207398820U (en) | 2018-05-22 |
Family
ID=62324101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721571289.8U Expired - Fee Related CN207398820U (en) | 2017-11-22 | 2017-11-22 | Generator unit stator one-phase ground protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207398820U (en) |
-
2017
- 2017-11-22 CN CN201721571289.8U patent/CN207398820U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20180522 |