CN108199348B - A kind of exciting transformer high voltage side current fast tripping protection method - Google Patents
A kind of exciting transformer high voltage side current fast tripping protection method Download PDFInfo
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- CN108199348B CN108199348B CN201810139090.0A CN201810139090A CN108199348B CN 108199348 B CN108199348 B CN 108199348B CN 201810139090 A CN201810139090 A CN 201810139090A CN 108199348 B CN108199348 B CN 108199348B
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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
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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
- H02H7/042—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 for current transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of exciting transformer high voltage side current fast tripping protection method, protective relaying device is sampled and is carried out virtual value calculating to exciting transformer high and low pressure side electric current, when the fundamental wave virtual value of exciting transformer high voltage side current is more than definite value Iset1, and the fundamental wave virtual value of exciting transformer low-pressure side electric current is lower than definite value Iset2, and when excitation surge current does not occur in exciting transformer, it is judged to exciting transformer and internal short circuit fault occurs, to realize exciting transformer high voltage side current fast tripping protection.High voltage side current fast tripping protection definite value of the invention is not necessarily to encourage and escape the principle of low-pressure side three-phase shortcircuit condition by hiding by force and adjust; it need to only be adjusted by the principle for nominal current conditions of hiding; and it is no-delay, solve the problems, such as that fast tripping protection detection exciting transformer slight internal fault sensitivity in existing exciting transformer high-pressure side is relatively low.
Description
Technical field
The invention belongs to field of relay protection in power, in particular to a kind of exciting transformer high voltage side current quick-break is protected
Maintaining method.
Background technique
Exciting transformer is the important component of generator excited system, is a kind of special offer three-phase AC excitation electricity
The equipment in source, excitation system convert generator amature DC power supply for three phase mains by silicon-controlled, form generator excitation
Magnetic field adjusts SCR Trigger Angle by excitation system, achievees the purpose that adjust set end voltage and idle.The peace of exciting transformer
Entirely, stable operation is the elder generation that is generating set stable electric generation, generates electricity at full capacity from the premise of shunt excitation unit safety, stable operation
Certainly condition is the key that excitation system reliability service.Domestic exciting transformer protective device often uses conventional high-pressure side overcurrent
For fast tripping protection as main protection, high-pressure side instantaneous over-current protection definite value principle is need to be by escaping low-pressure side three-phase shortcircuit condition and hair
Motor encourages electric current by force to adjust, however when serious three-phase shortcircuit occurs for low-pressure side or generator occurs to encourage by force, high-pressure side electricity
It flows to toward reaching several times rated current.The sensitivity and rapidity for sacrificing protection since instantaneous over-current definite value is excessive, work as excitation
Inside transformer occurs quickly cut off failure when minor failure, unfavorable to protected device.
Summary of the invention
The main object of the present invention is to provide a kind of exciting transformer high voltage side current fast tripping protection method, high-pressure side
Current quick definite value is not necessarily to encourage and escape the principle of low-pressure side three-phase shortcircuit condition by hiding by force and adjust, only need to be specified by hiding
The principle of current condition is adjusted, and no-delay, solves existing exciting transformer high-pressure side fast tripping protection detection excitation transformation
The relatively low problem of device slight internal fault sensitivity.
The technical scheme adopted by the invention is as follows: a kind of exciting transformer high voltage side current fast tripping protection method, relay protection
Device samples exciting transformer high and low pressure side electric current, and the fundamental wave for calculating exciting transformer high and low pressure side electric current is effective
Value；When the fundamental wave virtual value of exciting transformer high voltage side current is more than definite value Iset1, and exciting transformer low-pressure side electric current
Fundamental wave virtual value is lower than definite value Iset2, and when there is not excitation surge current in exciting transformer, be judged to exciting transformer occur it is internal
Short trouble.
Further, the fundamental wave virtual value of the exciting transformer high voltage side current is more than definite value Iset1, definite value Iset1It is not necessarily to
It encourages and escapes the principle of low-pressure side three-phase shortcircuit condition by hiding by force and adjust, need to only come by the principle for nominal current conditions of hiding whole
Fixed, delay takes 0s；
Protection criteria are as follows:
Wherein, Ih.maxFor the maximum value of exciting transformer high-pressure side three-phase current fundamental wave virtual value；Iset1It is got higher for excitation
Press side current quick-breaking definite value；KrelFor safety factor, 1.2~1.3 are taken；KrFor drop-off to pick-up radio, 0.9~0.95 is taken；Ih.eFor excitation
High voltage side of transformer rated current.
Further, the fundamental wave virtual value that low-pressure side electric current when internal fault occurs for the exciting transformer is lower than definite value
Iset2, specific Protection criteria are as follows:
Wherein, Il.maxFor the maximum value of exciting transformer low-pressure side three-phase current fundamental wave virtual value；Iset2It is lower for excitation
Press side overcurrent condition definite value；KrelFor safety factor, 1.2~1.3 are taken；Il.eFor exciting transformer low-pressure side rated current.
Further, the judgment method of excitation surge current includes: using high voltage side current secondary harmonic brake criterion, using height
Pressure side electric current interrupted angle principle is known using waveform symmetry principle, according to the port voltage of transformer using voltage braking principle
Whether other exciting transformer there is excitation surge current.
Further, described to identify whether exciting transformer encourages using high voltage side current secondary harmonic brake criterion
Magnetic shoves, and wherein secondary harmonic brake includes comprehensive closedown mode, crossing blocking mode and presses phase closedown mode；
Comprehensive closedown mode criterion are as follows:
Ih2ω.max> K2ωIh.maxFormula (3)
Wherein: Ih.maxIt is defined as above；Ih2ω.maxMost for exciting transformer high-pressure side three-phase current second harmonic virtual value
Big value；K2ωFor secondary harmonic brake coefficient, 15% is generally taken；
Crossing blocking mode criterion are as follows:
Wherein: Iha, Ihb, IhcThe respectively fundamental wave virtual value of exciting transformer high-pressure side three-phase current；Iha2ω, Ihb2ω,
Ihc2ωThe respectively second harmonic virtual value of exciting transformer high-pressure side three-phase current；K2ωIt is defined as above；
By phase closedown mode criterion are as follows:
Wherein: Iha, Ihb, Ihc, Iha2ω, Ihb2ω, Ihc2ω, K2ωIt is defined as above.
The beneficial effects of the present invention are: realizing a kind of completely new exciting transformer high-pressure side instantaneous over-current protection, high pressure
Side current quick definite value is not necessarily to encourage and escape the principle of low-pressure side three-phase shortcircuit condition by hiding by force and adjust, only need to be by volume of hiding
The principle of constant current condition is adjusted, and no-delay, substantially increases the sensitivity of detection exciting transformer slight internal failure,
The more preferable safety for ensureing equipment.
Detailed description of the invention
Fig. 1 show exciting transformer in the present invention and respectively surveys current measurement schematic diagram；
Fig. 2 show logic diagram of the invention.
Specific embodiment
Technical solution of the present invention is described in detail below with reference to attached drawing.
Embodiment 1
With reference to Fig. 1, application foundation of the invention are as follows: exciting transformer high-pressure side and low-pressure side three-phase current.In Fig. 1, F is
Exciting transformer internal fault position.When minor failure occurring at F, existing exciting transformer instantaneous over-current protects general nothing
Method quickly realizes protective effect to failure F.
In order to realize that high-pressure side instantaneous over-current of the invention protects purpose, it is exciting transformer high pressure that CT1, which is arranged, in the present invention
Side current transformer, CT2 are exciting transformer low-pressure side current transformer；Label 50E indicates the protection of high-pressure side instantaneous over-current
Node current association.
A certain exciting transformer basic parameter is as follows:
Rated capacity SnFor 6000kVA, mode of connection Dyn5, high-pressure side voltage rating UhnFor 20kV, low-pressure side is specified
Voltage UlnFor 0.84kV, high-pressure side CT no-load voltage ratio NCT1It is 200/5, low-pressure side CT no-load voltage ratio NCT2It is 5000/5, generator rated excitation
Electric current IfdnFor 4145A, excitation forcing ratio KQLIt is 2 times.Existing exciting transformer high voltage side current fast tripping protection definite value is encouraged by force by escaping
Principle adjust, then current quick-breaking definite value Is′etAre as follows:
Wherein, Is′etFor existing excitation-transformation variable high voltage side current quick-break definite value；Kr′elFor safety factor, 1.5 are taken；βLFor three-phase
Fully controlled bridge rectification coefficient, takes 0.816.
The present invention provides a kind of exciting transformer high voltage side current fast tripping protection method, comprising:
Exciting transformer high and low pressure side electric current is obtained, and carries out exciting transformer high and low pressure side current first harmonics virtual value meter
It calculates；
Exciting transformer internal short circuit fault is differentiated, when the fundamental wave virtual value of exciting transformer high voltage side current is more than definite value
Iset1, and the fundamental wave virtual value of exciting transformer low-pressure side electric current is lower than definite value Iset2, and exciting transformer does not occur excitation
When shoving, it is judged to exciting transformer and internal short circuit fault occurs；The fundamental wave virtual value of exciting transformer high voltage side current is more than fixed
Value Iset1, definite value Iset1It, only need to be by rated current of hiding without encouraging and escaping low-pressure side three-phase shortcircuit condition principle by hiding by force and adjust
Condition principle is adjusted, and delay takes 0s；
Protection criteria are as follows:
Wherein, Ih.maxFor the maximum value of exciting transformer high-pressure side three-phase current fundamental wave virtual value；Iset1It is got higher for excitation
Press side current quick-breaking definite value；KrelFor safety factor, 1.2 are taken；KrFor drop-off to pick-up radio, 0.95 is taken；Ih.eFor exciting transformer high pressure
Side rated current.
Formula (7) and formula (6) comparison find that high voltage side current quick-break definite value can be greatly lowered in the method for the present invention.
Since exciting transformer low-pressure side is inactive side, the fundamental wave of low-pressure side electric current when internal fault occurs for exciting transformer
Virtual value is lower than definite value Iset2；
Specific Protection criteria are as follows:
Wherein, Il.maxFor the maximum value of exciting transformer low-pressure side three-phase current fundamental wave virtual value；Iset2It is lower for excitation
Press side overcurrent condition definite value；KrelFor safety factor, 1.2 are taken；Il.eFor exciting transformer low-pressure side rated current.
The judgment method of excitation surge current includes: using high voltage side current secondary harmonic brake criterion, using high voltage side current
Interrupted angle principle identifies excitation-transformation variable using voltage braking principle using waveform symmetry principle, according to the port voltage of transformer
Whether depressor there is excitation surge current.Exciting transformer is identified using high voltage side current secondary harmonic brake criterion in the present embodiment
Whether excitation surge current is occurred, and wherein secondary harmonic brake includes comprehensive closedown mode, crossing blocking mode and presses phase closedown mode；
Comprehensive closedown mode criterion are as follows:
Ih2ω.max> K2ωIh.maxFormula (3)
Wherein: Ih.maxIt is defined as above；Ih2ω.maxMost for exciting transformer high-pressure side three-phase current second harmonic virtual value
Big value；K2ωFor secondary harmonic brake coefficient, 15% is generally taken；
Crossing blocking mode criterion are as follows:
Wherein: Iha, Ihb, IhcThe respectively fundamental wave virtual value of exciting transformer high-pressure side three-phase current；Iha2ω, Ihb2ω,
Ihc2ωThe respectively second harmonic virtual value of exciting transformer high-pressure side three-phase current；K2ωIt is defined as above；
By phase closedown mode criterion are as follows:
Wherein: Iha, Ihb, Ihc, Iha2ω, Ihb2ω, Ihc2ω, K2ωIt is defined as above.
In summary, if secondary harmonic brake selects comprehensive closedown mode, relay protective scheme block diagram as shown in Fig. 2,
A kind of exciting transformer high-pressure side instantaneous over-current Protection criteria are as follows:
When meeting the operation equation of formula (9) in the operational process of excitation transformation side, high-pressure side instantaneous over-current protection act.
After method of the invention, high voltage side current fast tripping protection definite value is not necessarily to encourage and escape by force low-pressure side three-phase by hiding
The principle of short circuit condition is adjusted, and need to only adjust, and no-delay by the principle for nominal current conditions of hiding, solve existing excitation
High voltage side of transformer fast tripping protection detects the relatively low problem of exciting transformer slight internal fault sensitivity.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. a kind of exciting transformer high voltage side current fast tripping protection method, which is characterized in that protective relaying device is to excitation transformation
Device high and low pressure side electric current is sampled, and calculates the fundamental wave virtual value of exciting transformer high and low pressure side electric current；When excitation transformation
The maximum value of device high-pressure side three-phase current fundamental wave virtual value is more than definite value Iset1, and exciting transformer low-pressure side three-phase current base
The maximum value of wave virtual value is lower than definite value Iset2, and when excitation surge current does not occur in exciting transformer, it is judged to exciting transformer and goes out
Existing internal short circuit fault.
2. a kind of exciting transformer high voltage side current fast tripping protection method as described in claim 1, it is characterised in that: described to encourage
The maximum value of magnetic transformer high-pressure side three-phase current fundamental wave virtual value is more than definite value Iset1, definite value Iset1By nominal current conditions of hiding
Principle adjust；
Protection criteria are as follows:
Wherein, Ih.maxFor the maximum value of exciting transformer high-pressure side three-phase current fundamental wave virtual value；Iset1For excitation-transformation variable high-pressure side
Current quick-breaking definite value；KrelFor safety factor, 1.2~1.3 are taken；KrFor drop-off to pick-up radio, 0.9~0.95 is taken；Ih.eFor excitation transformation
Device high-pressure side rated current.
3. a kind of exciting transformer high voltage side current fast tripping protection method as described in claim 1, it is characterised in that: described to encourage
The maximum value that low-pressure side three-phase current fundamental wave virtual value when internal fault occurs for magnetic transformer is lower than definite value Iset2, specifically protection is sentenced
According to are as follows:
Wherein, Il.maxFor the maximum value of exciting transformer low-pressure side three-phase current fundamental wave virtual value；Iset2For excitation low pressure side
Overcurrent condition definite value；KrelFor safety factor, 1.2~1.3 are taken；Il.eFor exciting transformer low-pressure side rated current.
4. a kind of exciting transformer high voltage side current fast tripping protection method as described in claim 1, which is characterized in that excitation is gushed
The judgment method of stream includes: using high voltage side current secondary harmonic brake criterion, using high voltage side current interrupted angle principle, use
Waveform symmetry principle identifies whether exciting transformer excitation occurs using voltage braking principle according to the port voltage of transformer
It shoves.
5. a kind of exciting transformer high voltage side current fast tripping protection method as claimed in claim 4, which is characterized in that described to adopt
Identify whether exciting transformer excitation surge current occurs with high voltage side current secondary harmonic brake criterion, wherein secondary harmonic brake
Including comprehensive closedown mode, crossing blocking mode and press phase closedown mode；
Comprehensive closedown mode criterion are as follows:
Ih2ω.max>K2ωIh.maxFormula (3)
Wherein: Ih.maxFor the maximum value of exciting transformer high-pressure side three-phase current fundamental wave virtual value；Ih2ω.maxFor exciting transformer
The maximum value of high-pressure side three-phase current second harmonic virtual value；K2ωFor secondary harmonic brake coefficient, 15% is taken；
Crossing blocking mode criterion are as follows:
Wherein: Iha, Ihb, IhcThe respectively fundamental wave virtual value of exciting transformer high-pressure side three-phase current；Iha2ω, Ihb2ω, Ihc2ωPoint
Not Wei exciting transformer high-pressure side three-phase current second harmonic virtual value；K2ωIt is defined as above；
By phase closedown mode criterion are as follows:
Wherein: Iha, Ihb, Ihc, Iha2ω, Ihb2ω, Ihc2ω, K2ωIt is defined as above.
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| CN201810139090.0A CN108199348B (en) | 2018-02-11 | 2018-02-11 | A kind of exciting transformer high voltage side current fast tripping protection method |
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| CN201810139090.0A CN108199348B (en) | 2018-02-11 | 2018-02-11 | A kind of exciting transformer high voltage side current fast tripping protection method |
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| CN108199348B true CN108199348B (en) | 2019-05-21 |
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| CN110488191A (en) * | 2019-09-12 | 2019-11-22 | 岭澳核电有限公司 | Nuclear power plant's emergency diesel dynamo off-line testing system |
| CN110531263A (en) * | 2019-09-12 | 2019-12-03 | 岭澳核电有限公司 | Nuclear power plant's emergency diesel dynamo off-line testing method |
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| CN201830032U (en) * | 2010-11-02 | 2011-05-11 | 石家庄市博大工控有限公司 | Transformer load monitoring instrument |
| CN103178502A (en) * | 2012-07-23 | 2013-06-26 | 南京南瑞继保电气有限公司 | Single-phase grounding protection method for generator set main transformer bus on low voltage side |
| CN106410749A (en) * | 2015-12-31 | 2017-02-15 | 南华大学 | Load transformer differential quick-break protection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9817061B2 (en) * | 2015-07-16 | 2017-11-14 | The Boeing Company | Linear variable differential transformer (LVDT) secondary wiring intermittent failure monitor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201830032U (en) * | 2010-11-02 | 2011-05-11 | 石家庄市博大工控有限公司 | Transformer load monitoring instrument |
| CN103178502A (en) * | 2012-07-23 | 2013-06-26 | 南京南瑞继保电气有限公司 | Single-phase grounding protection method for generator set main transformer bus on low voltage side |
| CN106410749A (en) * | 2015-12-31 | 2017-02-15 | 南华大学 | Load transformer differential quick-break protection method |
Non-Patent Citations (2)
| Title |
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| 基于小矢量技术的快速差动电流速断保护;邓祥力 等;《电力系统自动化》;20120725;第36卷(第14期);第67-71页 |
| 负荷变压器差动速断保护区外故障误动原因分析及对策;周昊程 等;《电力系统自动化》;20140725;第38卷(第14期);第122-125页 |
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