CN111934285A - Dry-type air-core reactor turn-to-turn short circuit protection method and device - Google Patents
Dry-type air-core reactor turn-to-turn short circuit protection method and device Download PDFInfo
- Publication number
- CN111934285A CN111934285A CN202010947575.XA CN202010947575A CN111934285A CN 111934285 A CN111934285 A CN 111934285A CN 202010947575 A CN202010947575 A CN 202010947575A CN 111934285 A CN111934285 A CN 111934285A
- Authority
- CN
- China
- Prior art keywords
- current
- phase voltage
- dry
- type air
- turn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000012545 processing Methods 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 15
- 230000003750 conditioning effect Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000003993 interaction Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 239000000779 smoke Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- 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
- H02H7/20—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 electronic equipment
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a method and a device for protecting turn-to-turn short circuit of a dry-type air reactor, wherein after the dry-type air reactor is put into operation, phase voltage and phase current of the dry-type air reactor are simultaneously collected in a period, active current is calculated and stored as a reference value; after a plurality of periods of continuous intervals, phase voltage and phase current of the dry air-core reactor are simultaneously collected in one period, active current is calculated and stored as a current value; correspondingly calculating the ratio of the current value and the reference value of the active current and the phase voltage; if the current active current ratio is larger than the set threshold and the current phase voltage ratio is smaller than the set threshold, judging that the inter-turn short circuit fault occurs in the dry air reactor; if the ratio of the active current is smaller than the set threshold value and the phase voltage of the current phase changes relative to the phase voltage of the last sampling period, replacing the reference value by using the current value; otherwise, the reference value is kept unchanged. The invention improves the sensitivity and reliability of the dry-type air-core reactor protection.
Description
Technical Field
The invention relates to the technical field of dry-type air-core reactors, in particular to a method and a device for protecting turn-to-turn short circuit of a dry-type air-core reactor.
Background
With the increasing operation of dry-type air-core reactors in a power grid, the situations of reactor faults are increased, especially after the reactor has turn-to-turn short circuit faults, the protection of the reactor cannot rapidly act to remove fault phases, so that the fault phases are burnt out by fire, and the protection cannot act until the turn-to-turn short circuit is enlarged and developed into a relative ground or phase-to-phase short circuit or the current is changed greatly, and the current is increased to an action threshold value. The reason why the operation is not performed but hysteresis operation is not sufficient, is mainly that when the reactor has an inter-turn short circuit fault, even if the current of the short circuit loop becomes very large, the current change of the phase current of the reactor is a little bit in the current air-core reactor structure, and the current of the short circuit loop cannot be detected because the phase current change value of the reactor does not reach the operation threshold value of protection because the current over-current protection of the two-stage reactor is configured, so that the protection cannot be performed naturally. Besides small phase current change, the voltage, inductance, magnetic field and other electric quantities of the dry-type air-core reactor are not obvious in change value during turn-to-turn short circuit fault, and the purpose of early warning is difficult to achieve by monitoring the dry-type air-core reactor. As such, some new protection methods have come up, such as:
1. the smoke monitoring method comprises the following steps: the smoke detector is used for detecting smoke generated by the burning of the reactor, and whether the reactor breaks down or not can be judged. The defects that if the air circulation speed is high, the generated smoke is easily blown away quickly, the concentration identified by a detector is difficult to form, and the monitoring cannot be performed.
2. The temperature monitoring method comprises the following steps: the temperature change of the reactor is monitored, and whether the reactor is abnormal or not can be judged. The method has very strict requirements on the temperature measuring probe, the temperature measuring probe is required to prevent the influence of a strong magnetic field (hundreds of mT) and a strong electric field (35kV or more), the number of temperature measuring points is also considered (because the hot spot is difficult to position, the probe is required to be mounted more in principle, the arrangement of the probe is actually limited by the structure, the economy, the safety and the like of the electric reactor, a large number of probes cannot be mounted, a protection dead zone possibly exists, the mounting space is narrow (the width of an air passage of the hollow electric reactor is generally not more than 25mm), vibration and the like.
3. Monitoring methods of phase angle, active power, joule heat and the like: although theoretically, the change of phase angle, active power, joule heat and the like before and after the turn-to-turn short circuit is really obvious, and the sensitivity can be improved by taking the change as the monitoring quantity, at present, the change process of the turn-to-turn short circuit is not fully considered by the methods, and the setting of the protection action threshold value is not ideal.
Disclosure of Invention
The invention aims to solve the problem that the conventional dry-type air reactor has low sensitivity and reliability in the use process, and provides a method and a device for protecting the turn-to-turn short circuit of the dry-type air reactor.
In order to solve the problems, the invention is realized by the following technical scheme:
a turn-to-turn short circuit protection method for a dry-type air-core reactor comprises the following steps:
step 1, after a dry type air-core reactor is put into operation, phase voltage and phase current of the dry type air-core reactor are collected simultaneously in a period; calculating active current by using the obtained phase voltage and phase current, and storing the active current and the phase voltage as a current active current reference value and a current phase voltage reference value;
step 2, after a plurality of periods of continuous intervals, simultaneously acquiring phase voltage and phase current of the dry-type air-core reactor in one period; calculating active current by using the obtained phase voltage and phase current, and taking the active current and the phase voltage as the current active current and the current phase voltage;
step 3, calculating the ratio of the current active current to the current active current reference value, and taking the ratio as the current active current ratio; meanwhile, calculating the ratio of the current phase voltage to the current phase voltage reference value, and taking the ratio as the current phase voltage ratio;
step 4, if the current active current ratio is larger than the set active current ratio threshold and the current phase voltage ratio is smaller than the set phase voltage ratio threshold, judging that the dry-type air-core reactor has a turn-to-turn short circuit fault, and sending a corresponding alarm signal and/or a cut-off signal; if the ratio of the active current is smaller than the set ratio threshold of the active current and the current phase voltage changes relative to the phase voltage of the last sampling period, replacing the current active current with the current active current reference value and replacing the current phase voltage with the current phase voltage reference value; otherwise, keeping the current active current reference value and the current phase voltage reference value unchanged;
and 5, repeating the step 2 to the step 4 in the operation process of the dry-type air-core reactor.
In the above steps 1 and 2, the active current IpThe calculation formula of (2) is as follows:
in the formula (I), the compound is shown in the specification,
at represents the sampling interval of the phase voltage or phase current in one sampling period,
t represents the time length of a sampling period, and N represents the number of sampling points of phase voltage and phase current in the sampling period; u (k Δ t) represents the phase voltage of the kth sampling point within one sampling period; i (k Δ t) represents the phase current at the kth sampling point within one sampling period; and omega represents the power frequency angular frequency.
In step 2, the interval between two sampling periods is at least 50 or more.
In the step 4, the set ratio threshold of the active current and the ratio threshold of the phase voltage are not more than 1.5.
The turn-to-turn short circuit protection device for the dry-type air-core reactor for realizing the method comprises an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a human-computer interaction interface; the input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor; the output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value; the man-machine interaction interface and the communication interface circuit are connected with the central processing unit.
In the above scheme, the communication interface circuit includes an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit.
In the above scheme, the human-computer interaction interface is a touch screen.
In the scheme, one end of the communication interface circuit is connected with the central processing unit, and the other end of the communication interface circuit is connected with the upper computer.
Compared with the prior art, the invention improves the sensitivity and the reliability of the dry-type air-core reactor protection, and can timely and correctly act when the reactor has turn-to-turn short circuit fault, thereby avoiding the further expansion of the fault.
Drawings
Fig. 1 is a schematic block diagram of a turn-to-turn short circuit protection device of a dry-type air-core reactor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings in conjunction with specific examples. It should be noted that directional terms such as "upper", "lower", "middle", "left", "right", "front", "rear", and the like, referred to in the examples, refer only to the direction of the drawings. Accordingly, the directions used are for illustration only and are not intended to limit the scope of the present invention.
A turn-to-turn short circuit protection method for a dry-type air-core reactor specifically comprises the following steps:
step 1, after a dry type air-core reactor is put into operation, phase voltage and phase current of the dry type air-core reactor are collected simultaneously in a period; calculating active current by using the obtained phase voltage and phase current, and storing the active current and the phase voltage as a current active current reference value and a current phase voltage reference value;
step 2, after a plurality of periods of continuous intervals, simultaneously acquiring phase voltage and phase current of the dry-type air-core reactor in one period; calculating active current by using the obtained phase voltage and phase current, and taking the active current and the phase voltage as the current active current and the current phase voltage;
step 3, calculating the ratio of the current active current to the current active current reference value, and taking the ratio as the current active current ratio; meanwhile, calculating the ratio of the current phase voltage to the current phase voltage reference value, and taking the ratio as the current phase voltage ratio;
step 4, if the current active current ratio is larger than the set active current ratio threshold and the current phase voltage ratio is smaller than the set phase voltage ratio threshold, judging that the dry-type air-core reactor has a turn-to-turn short circuit fault, and sending a corresponding alarm signal and/or a cut-off signal; if the ratio of the active current is smaller than the set ratio threshold of the active current and the current phase voltage changes relative to the phase voltage of the last sampling period, replacing the current active current with the current active current reference value and replacing the current phase voltage with the current phase voltage reference value; otherwise, keeping the current active current reference value and the current phase voltage reference value unchanged;
and 5, repeating the step 2 to the step 4 in the operation process of the dry-type air-core reactor.
The active current IpThe calculation formula of (2) is as follows:
wherein:
in the formula (I), the compound is shown in the specification,
the sampling interval of the phase voltage in one sampling period is the same as the sampling interval of the phase current in one sampling period, both are at,
t represents the time length of a sampling period, and N represents the number of sampling points of phase voltage and phase current in the sampling period; u (k Δ t) represents the phase voltage of the kth sampling point within one sampling period; i (k Δ t) represents the phase current at the kth sampling point within one sampling period; and omega represents the power frequency angular frequency.
Before the protection device is put into use, the active current of the dry type air reactor after different turn-to-turn short circuits is calculated according to different dry type air reactor simulations, the condition that the change amount of the active current is minimum is selected, the ratio of the active current to the active current before the short circuit is referred to under the condition, the development process of the turn-to-turn short circuit is fully considered, and the number of the periods between two proper sampling periods, the ratio threshold value of the active current and the ratio threshold value of the phase voltage are comprehensively set. In this embodiment, the number of cycles separated between two sampling cycles is at least 50 or more, i.e., the two cycles are separated by at least 1 second or more. The ratio threshold of the active current and the ratio threshold of the phase voltage are not more than 1.5.
The turn-to-turn short circuit protection device for the dry-type air-core reactor for realizing the method comprises an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a man-machine interaction interface, wherein the A/D signal conversion unit is used for converting an analog signal into a digital signal. In this embodiment, the communication interface circuit includes an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit; the human-computer interaction interface is a touch screen. The input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor. The output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value and drive the alarm device and/or the switch actuating mechanism. The man-machine interaction interface is connected with the central processing unit. One end of the communication interface circuit is connected with the central processing unit, and the other end of the communication interface circuit is connected with the upper computer.
And the analog signal conditioning unit acquires phase voltage and phase current of the dry air-core reactor. And the A/D signal conversion unit performs analog-to-digital conversion on the phase voltage and the phase current of the dry air reactor acquired by the analog signal conditioning unit and then sends the phase voltage and the phase current to the central processing unit. The central processing unit utilizes the analog phase voltage and the phase current to judge the turn-to-turn short circuit fault and outputs the switching value to drive the alarm device and/or the switch actuating mechanism when the turn-to-turn short circuit fault occurs. The man-machine interaction interface is used for setting system parameters and displaying operation parameters. The communication interface circuit is used for realizing the communication between the protection device and the upper computer and enabling the protection device and the upper computer to send and receive data.
It should be noted that, although the above-mentioned embodiments of the present invention are illustrative, the present invention is not limited thereto, and thus the present invention is not limited to the above-mentioned embodiments. Other embodiments, which can be made by those skilled in the art in light of the teachings of the present invention, are considered to be within the scope of the present invention without departing from its principles.
Claims (8)
1. A turn-to-turn short circuit protection method for a dry-type air-core reactor is characterized by comprising the following steps:
step 1, after a dry type air-core reactor is put into operation, phase voltage and phase current of the dry type air-core reactor are collected simultaneously in a period; calculating active current by using the obtained phase voltage and phase current, and storing the active current and the phase voltage as a current active current reference value and a current phase voltage reference value;
step 2, after a plurality of periods of continuous intervals, simultaneously acquiring phase voltage and phase current of the dry-type air-core reactor in one period; calculating active current by using the obtained phase voltage and phase current, and taking the active current and the phase voltage as the current active current and the current phase voltage;
step 3, calculating the ratio of the current active current to the current active current reference value, and taking the ratio as the current active current ratio; meanwhile, calculating the ratio of the current phase voltage to the current phase voltage reference value, and taking the ratio as the current phase voltage ratio;
step 4, if the current active current ratio is larger than the set active current ratio threshold and the current phase voltage ratio is smaller than the set phase voltage ratio threshold, judging that the dry-type air-core reactor has a turn-to-turn short circuit fault, and sending a corresponding alarm signal and/or a cut-off signal; if the ratio of the active current is smaller than the set ratio threshold of the active current and the current phase voltage changes relative to the phase voltage of the last sampling period, replacing the current active current with the current active current reference value and replacing the current phase voltage with the current phase voltage reference value; otherwise, keeping the current active current reference value and the current phase voltage reference value unchanged;
and 5, repeating the step 2 to the step 4 in the operation process of the dry-type air-core reactor.
2. A dry-type air-core reactor turn-to-turn short circuit protection method as claimed in claim 1, characterized in that in steps 1 and 2, the active current IpThe calculation formula of (2) is as follows:
in the formula (I), the compound is shown in the specification,
at represents the sampling interval of the phase voltage or phase current in one sampling period,
t represents the time length of a sampling period, and N represents the number of sampling points of phase voltage and phase current in the sampling period; u (k Δ t) represents the phase voltage of the kth sampling point within one sampling period; i (k Δ t) represents the phase current at the kth sampling point within one sampling period; and omega represents the power frequency angular frequency.
3. The turn-to-turn short circuit protection method for the dry-type air-core reactor according to claim 1, wherein in the step 2, the interval between two sampling periods is at least more than 50.
4. The method for protecting the turn-to-turn short circuit of the dry-type air-core reactor according to claim 1, wherein in the step 4, the ratio threshold of the active current and the ratio threshold of the phase voltage are not more than 1.5.
5. A dry-type air-core reactor turn-to-turn short circuit protection device for realizing the method of claim 1 is characterized by comprising an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a human-computer interaction interface;
the input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor; the output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value; the man-machine interaction interface and the communication interface circuit are connected with the central processing unit.
6. A dry-type air-core reactor turn-to-turn short circuit protection device as claimed in claim 5, characterized in that the communication interface circuit comprises an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit.
7. A dry-type air-core reactor turn-to-turn short circuit protection device as claimed in claim 5, characterized in that the human-machine interface is a touch screen.
8. A dry-type air-core reactor turn-to-turn short circuit protection device as claimed in claim 5, wherein one end of the communication interface circuit is connected with the central processing unit, and the other end is connected with the upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010947575.XA CN111934285A (en) | 2020-09-10 | 2020-09-10 | Dry-type air-core reactor turn-to-turn short circuit protection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010947575.XA CN111934285A (en) | 2020-09-10 | 2020-09-10 | Dry-type air-core reactor turn-to-turn short circuit protection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111934285A true CN111934285A (en) | 2020-11-13 |
Family
ID=73309647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010947575.XA Pending CN111934285A (en) | 2020-09-10 | 2020-09-10 | Dry-type air-core reactor turn-to-turn short circuit protection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111934285A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740313A (en) * | 2022-03-30 | 2022-07-12 | 国网安徽省电力有限公司马鞍山供电公司 | Dry-type air-core reactor turn-to-turn insulation defect detection system and method |
| CN114994567A (en) * | 2022-06-21 | 2022-09-02 | 国网四川省电力公司电力科学研究院 | Dry-type hollow parallel reactor turn-to-turn short circuit fault online detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786369A (en) * | 2016-12-26 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | The guard method of the dry-type air-core reactor in parallel based on active power |
| WO2018129842A1 (en) * | 2017-01-10 | 2018-07-19 | 华北电力大学 | Pilot protection method for transmission line of new energy station based on current waveform similarity |
| WO2018219174A1 (en) * | 2017-06-02 | 2018-12-06 | 南京南瑞继保电气有限公司 | Fault switch configuration and clearing method in flexible dc converter station |
| CN109274068A (en) * | 2018-10-24 | 2019-01-25 | 西安欣东源电气有限公司 | Dry reactor shorted-turn fault protective device and method |
| CN212811271U (en) * | 2020-09-10 | 2021-03-26 | 桂林五环电器制造有限公司 | Turn-to-turn short circuit protection device for dry-type air-core reactor |
-
2020
- 2020-09-10 CN CN202010947575.XA patent/CN111934285A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786369A (en) * | 2016-12-26 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | The guard method of the dry-type air-core reactor in parallel based on active power |
| WO2018129842A1 (en) * | 2017-01-10 | 2018-07-19 | 华北电力大学 | Pilot protection method for transmission line of new energy station based on current waveform similarity |
| WO2018219174A1 (en) * | 2017-06-02 | 2018-12-06 | 南京南瑞继保电气有限公司 | Fault switch configuration and clearing method in flexible dc converter station |
| CN109274068A (en) * | 2018-10-24 | 2019-01-25 | 西安欣东源电气有限公司 | Dry reactor shorted-turn fault protective device and method |
| CN212811271U (en) * | 2020-09-10 | 2021-03-26 | 桂林五环电器制造有限公司 | Turn-to-turn short circuit protection device for dry-type air-core reactor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740313A (en) * | 2022-03-30 | 2022-07-12 | 国网安徽省电力有限公司马鞍山供电公司 | Dry-type air-core reactor turn-to-turn insulation defect detection system and method |
| CN114740313B (en) * | 2022-03-30 | 2024-04-05 | 国网安徽省电力有限公司马鞍山供电公司 | System and method for detecting turn-to-turn insulation defect of dry type air-core reactor |
| CN114994567A (en) * | 2022-06-21 | 2022-09-02 | 国网四川省电力公司电力科学研究院 | Dry-type hollow parallel reactor turn-to-turn short circuit fault online detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111934285A (en) | Dry-type air-core reactor turn-to-turn short circuit protection method and device | |
| CN106291219B (en) | Single-phase grounding/PT wire breakage fault automatic judging and alarming device and method | |
| CN103795022B (en) | Fault current detecting circuit | |
| CN104090230A (en) | Breaker safe operation real-time analysis early warning system | |
| CN105823983A (en) | Mechanical characteristic state on-line monitoring system for high voltage breaker | |
| CN108233347B (en) | A kind of brushless motor controller Over Current Protection System and over-current protection method | |
| CN104538233A (en) | State monitoring and early warning system and method for electric disconnecting link of transformer substation | |
| CN104215901A (en) | High voltage circuit breaker arc contact fault diagnosis method | |
| CN205809245U (en) | A kind of mechanical characteristic of high-voltage circuit breaker state on_line monitoring system | |
| CN204064509U (en) | A kind of temperature of high-tension switch cabinet on-line monitoring system | |
| CN109613426B (en) | Aging diagnosis method for plum blossom contact of high-voltage circuit breaker | |
| CN103854446A (en) | Method and device for diagnosing high-voltage switch cabinet dynamic temperature rising and alarming | |
| CN103457247A (en) | Multi-level full-range selective coordination and protection technology of low-voltage system | |
| CN102507816B (en) | Method for detecting effectiveness of oil chromatogram online monitoring data | |
| CN111934286A (en) | Dry-type air-core reactor turn-to-turn short circuit protection method and device based on power factor | |
| CN109036884B (en) | Intelligent high-voltage vacuum circuit breaker and mechanical characteristic parameter determining method thereof | |
| CN112858844A (en) | Method and system for detecting direct current arc fault in photovoltaic system | |
| CN106959414B (en) | The condition detection method and system of switchgear | |
| CN103163396A (en) | Small fuse detecting method for nuclear plant | |
| CN212811271U (en) | Turn-to-turn short circuit protection device for dry-type air-core reactor | |
| CN110514955A (en) | A kind of low current neutral grounding electric network single phase intermittent arc-earth faults localization method | |
| CN212811270U (en) | Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor | |
| CN113917323B (en) | Intelligent on-column switch monitoring system and method | |
| CN116647049A (en) | Comprehensive monitoring system for switch cabinet | |
| CN109506708A (en) | A kind of high voltage electric equipment internal temperature on-line monitoring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |