CN111276937A - Digital non-electric quantity protection method of oil-immersed transformer based on volume change - Google Patents
Digital non-electric quantity protection method of oil-immersed transformer based on volume change Download PDFInfo
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- CN111276937A CN111276937A CN202010160397.6A CN202010160397A CN111276937A CN 111276937 A CN111276937 A CN 111276937A CN 202010160397 A CN202010160397 A CN 202010160397A CN 111276937 A CN111276937 A CN 111276937A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
Abstract
The invention relates to a digital non-electric quantity protection method of an oil-immersed transformer based on volume variation, which comprises the following steps that (1) a digital volume sensor continuously measures the volume of gas in a digital gas relay in real time, and a volume value Vn is transmitted out at intervals of delta t; (2) judging whether the gas volume is larger than a volume starting value of the digital gas relay or not, and if so, starting a volume variation calculation program; if not, not starting the calculation program; (3) calculating the volume change delta Voil of the volume in the past delta t by using the volume value Vn received this time and the volume value Vn-1 received last time; (4) judging whether the volume change is larger than a set value or not; (5) and transmitting an alarm signal and a trip signal or not acting according to the judgment result. The method can protect the internal fault of the oil-immersed transformer in advance, and effectively prevent the fault of the oil-immersed transformer from being enlarged.
Description
Technical Field
The invention relates to the technical field of non-electric quantity protection of oil-immersed transformers, in particular to a digital non-electric quantity protection method of an oil-immersed transformer based on volume variation.
Background
The gas relay protection is widely applied to the electric oil-immersed transformer and is a key component in the non-electric quantity protection of the transformer. As the supplement of the electric quantity protection of the transformer, the gas volume protection in the gas relay is mainly used for early judgment of partial discharge and partial overheat faults in the transformer. Compared with the electrical quantity protection of the transformer, the non-electrical quantity protection which reflects the generation of the fault gas can more comprehensively and directly reflect the operation state of the transformer.
The gas relay gas volume protection of the oil immersed transformer which is widely adopted is a mechanical protection structure, the protection principle is that under the condition of internal faults of the transformer, transformer oil near a fault point is decomposed to generate gas, a small amount of gas is gathered in a gas relay cavity through a pipeline, an upper floater of the gas relay is reduced along with the descending of an oil level in the cavity, when a set protection action value is reached, an upper floater dry spring contact is closed, and the gas relay transmits an alarm signal.
The gas volume protection of the gas relay used at present has the defects of low reliability, delayed action of a mechanical structure, incapability of reflecting the gas volume increasing process and the like, and the gas volume protection is in failure and misoperation accidents sometimes occur. Because the traditional mechanical gas relay can only transmit signals when reaching the set action value, the whole process has the problems of overlong delay and possibility of missing the optimal protection time. Once a serious fault occurs in the transformer, the damage of the fault part of the transformer is serious when the gas relay acts for protection. In addition, the gas volume change process cannot be reflected, and data support cannot be provided for fault analysis after an accident.
Disclosure of Invention
The invention aims to provide a volume change-based digital non-electric quantity protection method for an oil-immersed transformer, which can quickly and continuously reflect the volume change of gas in a gas relay when the oil-immersed transformer has an internal fault, and can quickly judge and accurately deal with the fault.
In order to achieve the purpose, the invention adopts the following technical scheme:
the digital non-electric quantity protection method of the oil immersed transformer based on the volume variation comprises the following steps that (1), a digital volume sensor arranged in a cavity of a digital gas relay continuously measures the gas volume in the digital gas relay in real time, digital information of the gas volume is transmitted to a main controller of the digital gas relay at intervals of delta t, and the volume value is recorded as Vn;
(2) the digital gas relay main controller judges whether the gas volume is larger than a digital gas relay volume starting value or not, namely judges whether Vn is larger than or equal to Vopen or not, if so, a volume variation calculation program is started, and the step (3) is carried out; if not, not starting the calculation program;
(3) the digital gas relay main controller calculates the volume change amount delta Voil of the volume in the past delta t according to a formula delta Voil which is Vn-Vn-1 of the volume value Vn received at this time and the volume value Vn-1 received at the last time;
(4) the digital gas relay main controller compares the calculated volume change delta Voil with a setting value delta Vset and judges whether the volume change is larger than the set setting value or not;
(5) if delta Voil is larger than or equal to delta Vset for N times, judging that the gas gathering speed of the oil-immersed transformer is too high, and enabling the digital gas relay to act and transmit an alarm signal; if delta Voil continuously increases, judging that the oil-immersed transformer has an internal fault, transmitting a tripping signal, and tripping the breaker; otherwise, the digital gas relay does not act and returns to wait for the next volume calculation program to be started.
Further, the volume change amount in step (3) is continuously calculated.
Furthermore, in step (5), the number of consecutive times that Δ Voil is greater than or equal to Δ Vset is related to the setting value Δ Vset, and the number of consecutive times can be reduced as the setting value Δ Vse increases, but N is greater than or equal to 2.
Further, in the step (5), N is 3.
The invention has the beneficial effects that:
the digital non-electric quantity protection method of the oil-immersed transformer based on the volume change quantity continuously measures the gas volume in the gas relay through the digital volume sensor, transmits the volume information to the digital gas relay in real time, and the digital gas relay continuously calculates the gas volume change close quantity. Once the measured gas volume change of the digital gas relay is larger than the setting value, the internal fault of the transformer is judged, the judgment result is output, the breaker is tripped, the internal fault of the oil-immersed transformer is protected in advance, and the fault expansion of the oil-immersed transformer is effectively prevented. Meanwhile, the change process of the gas volume parameter can be recorded, and data support is provided for the research on the volume parameter change in the internal fault occurrence and development processes of the oil-immersed transformer.
Drawings
FIG. 1 is a corresponding flow chart of the present invention;
fig. 2 is a schematic view of the installation position of the digital buchholz relay.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention comprises the following steps:
for ease of understanding, the following symbols correspond to the meanings set forth below:
Δ t — the interval time between each information acquisition; vn- -the volume value collected;
vn-1- -the volume value collected previously; vopen-digital gas relay volume starting value;
Δ Voil — volume change over time Δ t;
Δ Vset — set volume change setting.
The invention discloses a digital non-electric quantity protection method of an oil-immersed transformer based on volume variation, which comprises the following steps:
step (1): the top in the digital gas relay cavity is provided with a digital volume sensor, the gas volume in the digital gas relay is continuously measured in real time through the digital volume sensor, digital information of the gas volume is transmitted to a main controller of the digital gas relay at intervals of delta t, and the volume value is recorded as Vn;
step (2): the digital gas relay main controller judges whether the gas volume is larger than a digital gas relay volume starting value, namely judges whether Vn is larger than or equal to Vopen and meets the requirement, if yes, a volume variation calculation program is started, and the step (3) is carried out; if not, not starting the calculation program;
and (3): the digital gas relay master controller calculates the volume change quantity delta Voil of the volume in the past delta t according to a formula delta Voil which is Vn-Vn-1 of the volume Vn received this time and the volume Vn-1 received last time; the calculation of the volume change is performed continuously;
and (4): the digital gas relay master controller compares the calculated volume change delta Voil with a setting value delta Vset and judges whether the volume change is larger than the set setting value or not;
and (5): if delta Voil is larger than or equal to delta Vset for 3 times continuously, judging that the gas gathering speed of the oil-immersed transformer is too high, and enabling the digital gas relay to act and transmit an alarm signal; if delta Voil is continuously increased, judging that the oil-immersed transformer has an internal fault, transmitting a tripping signal, and tripping the breaker; otherwise, the digital gas relay does not act and returns to wait for the next volume calculation program to be started.
And (4) the continuous times of delta Voil being more than or equal to delta Vset in the step (5) are related to the setting value delta Vset, and the continuous times can be reduced with the increase of the setting value delta Vse, but the continuous times are not less than 2 at least.
Through setting up reasonable Vopen value and delta Vset value, can effectively protect oil-immersed transformer internal fault in advance, prevent that the trouble from expanding.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (4)
1. The digital non-electric quantity protection method of the oil-immersed transformer based on the volume change is characterized by comprising the following steps: the method comprises the following steps that (1) a digital volume sensor arranged in a cavity of a digital gas relay continuously measures the gas volume in the digital gas relay in real time, digital information of the gas volume is transmitted to a main controller of the digital gas relay at intervals delta t, and the volume value is recorded as Vn;
(2) the digital gas relay main controller judges whether the gas volume is larger than a digital gas relay volume starting value or not, namely judges whether Vn is larger than or equal to Vopen or not, if so, a volume variation calculation program is started, and the step (3) is carried out; if not, not starting the calculation program;
(3) the digital gas relay main controller calculates the volume change amount delta Voil of the volume in the past delta t according to a formula delta Voil which is Vn-Vn-1 of the volume value Vn received at this time and the volume value Vn-1 received at the last time;
(4) the digital gas relay main controller compares the calculated volume change delta Voil with a setting value delta Vset and judges whether the volume change is larger than the set setting value or not;
(5) if delta Voil is larger than or equal to delta Vset for N times, judging that the gas gathering speed of the oil-immersed transformer is too high, and enabling the digital gas relay to act and transmit an alarm signal; if delta Voil continuously increases, judging that the oil-immersed transformer has an internal fault, transmitting a tripping signal, and tripping the breaker;
otherwise, the digital gas relay does not act and returns to wait for the next volume calculation program to be started.
2. The volume change based digital non-electric quantity protection method for the oil-filled transformer according to claim 1, wherein: the volume change amount in step (3) is continuously calculated.
3. The volume change based digital non-electric quantity protection method for the oil-filled transformer according to claim 1, wherein: in the step (5), the continuous times of delta Voil being more than or equal to delta Vset are related to the setting value delta Vset, and the continuous times can be reduced along with the increase of the setting value delta Vse, but N is more than or equal to 2.
4. The volume change based digital non-electric quantity protection method for the oil-filled transformer according to claim 1, wherein: in the step (5), N is 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010160397.6A CN111276937A (en) | 2020-03-10 | 2020-03-10 | Digital non-electric quantity protection method of oil-immersed transformer based on volume change |
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| CN202010160397.6A CN111276937A (en) | 2020-03-10 | 2020-03-10 | Digital non-electric quantity protection method of oil-immersed transformer based on volume change |
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| CN111816432A (en) * | 2020-07-10 | 2020-10-23 | 国网山东省电力公司电力科学研究院 | Gas relay for realizing intelligent tripping of transformer and gas protection method |
| CN112398092A (en) * | 2020-10-30 | 2021-02-23 | 三峡大学 | Transformer gas on-line monitoring and protecting method |
| CN114530826A (en) * | 2021-12-28 | 2022-05-24 | 国电南瑞科技股份有限公司 | Transformer light gas protection method and system based on organic gas concentration characteristics |
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| CN109787190A (en) * | 2019-02-28 | 2019-05-21 | 西安交通大学 | The digital non-ionizing energy loss method of oil-immersed transformer based on oil stream velocity variable |
| CN109904842A (en) * | 2019-02-28 | 2019-06-18 | 西安交通大学 | The digital protection method of oil-immersed transformer based on oil stream velocity characteristic |
| CN111999355A (en) * | 2020-07-15 | 2020-11-27 | 沈阳明远电气科技有限公司 | Transformer combustible gas online detection device and method |
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2020
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| CN109787190A (en) * | 2019-02-28 | 2019-05-21 | 西安交通大学 | The digital non-ionizing energy loss method of oil-immersed transformer based on oil stream velocity variable |
| CN109904842A (en) * | 2019-02-28 | 2019-06-18 | 西安交通大学 | The digital protection method of oil-immersed transformer based on oil stream velocity characteristic |
| CN111999355A (en) * | 2020-07-15 | 2020-11-27 | 沈阳明远电气科技有限公司 | Transformer combustible gas online detection device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111816432A (en) * | 2020-07-10 | 2020-10-23 | 国网山东省电力公司电力科学研究院 | Gas relay for realizing intelligent tripping of transformer and gas protection method |
| CN111816432B (en) * | 2020-07-10 | 2021-07-23 | 国网山东省电力公司电力科学研究院 | Gas relay for realizing intelligent tripping of transformer and gas protection method |
| CN112398092A (en) * | 2020-10-30 | 2021-02-23 | 三峡大学 | Transformer gas on-line monitoring and protecting method |
| CN114530826A (en) * | 2021-12-28 | 2022-05-24 | 国电南瑞科技股份有限公司 | Transformer light gas protection method and system based on organic gas concentration characteristics |
| CN114530826B (en) * | 2021-12-28 | 2024-02-13 | 国电南瑞科技股份有限公司 | Transformer light gas protection method and system based on concentration characteristics of organic gas |
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