CN107017604A - A kind of overvoltage protection voltage transformer disconnection faulty action preventing method - Google Patents
A kind of overvoltage protection voltage transformer disconnection faulty action preventing method Download PDFInfo
- Publication number
- CN107017604A CN107017604A CN201710239138.0A CN201710239138A CN107017604A CN 107017604 A CN107017604 A CN 107017604A CN 201710239138 A CN201710239138 A CN 201710239138A CN 107017604 A CN107017604 A CN 107017604A
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- China
- Prior art keywords
- voltage transformer
- voltage
- overvoltage
- protection
- transformer disconnection
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- 230000009471 action Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000004069 differentiation Effects 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- 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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
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 kind of overvoltage protection voltage transformer disconnection faulty action preventing method, gather by the voltage at protection equipment two ends；Calculate by the voltage difference at protection equipment two ends；According to the criterion of setting, voltage transformer disconnection differentiation is carried out；When being judged as voltage transformer disconnection, then instantaneous locking overvoltage protection.The present invention is determined whether occur voltage transformer disconnection by the size of the fundamental wave virtual value of protection equipment both end voltage difference by judging; overvoltage protection misoperation caused by voltage transformer disconnection can effectively be prevented; locking function of the overvoltage protection in voltage transformer disconnection is enhanced, overvoltage protection misoperation caused by voltage transformer disconnection is prevented.
Description
Technical field
The invention belongs to the design method field of relay protection of power system, and in particular to a kind of overvoltage protection voltage is mutual
Sensor broken string faulty action preventing method.
Background technology
In existing power system, part primary equipment is series connection access, and same voltage class is accessed at equipment two ends, such as
Shown in Fig. 1.The voltage at equipment two ends, which needs to install to make the difference after two groups of voltage transformers, each measurement voltage, to be obtained.
When secondary break occurs for any phase in two groups of voltage transformers, the calculating voltage of gained can be very big, typically larger than quilt
The overvoltage setting valve of protection equipment, the overvoltage protection of existing series connection access device lacks CT wire break blocking and sentenced
According to so as to cause overvoltage protection misoperation.
Accordingly, it would be desirable to a kind of quick CT wire break blocking criterion, for preventing overvoltage protection due to voltage
Transformer disconnection and misoperation.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of overvoltage protection voltage transformer disconnection faulty action preventing method, by sentencing
Break by the size of the fundamental wave virtual value of protection equipment both end voltage difference to determine whether to occur voltage transformer disconnection, can effectively prevent
Only overvoltage protection misoperation caused by voltage transformer disconnection.
Above-mentioned technical purpose is realized, above-mentioned technique effect is reached, the present invention is achieved through the following technical solutions：
A kind of overvoltage protection voltage transformer disconnection faulty action preventing method, comprises the following steps：
Step 1: collection is by the voltage at protection equipment two ends；
Step 2: calculating by the voltage difference at protection equipment two ends；
Step 3: according to the criterion of setting, carrying out voltage transformer disconnection differentiation；
Step 4: when being judged as voltage transformer disconnection, then instantaneous locking overvoltage protection.
Further, the step one is specially：Gathered respectively using located at by the voltage transformer at protection equipment two ends
By the voltage at protection equipment two ends.
Further, the step 2 is specially：The voltage by protection equipment two ends according to being collected in step one is done
Vector difference obtains voltage difference, and then calculates voltage difference fundamental wave virtual value.
Further, the criterion set in the step 3 as：By by the voltage difference fundamental wave virtual value at protection equipment two ends
It is compared with overvoltage locking definite value, when the poor fundamental wave virtual value of any phase voltage for being calculated is more than overvoltage locking definite value,
Then it is determined as voltage transformer disconnection.
Further, the overvoltage locking definite value is less than two of the voltage transformer of voltage class residing for protection equipment
Secondary rated value, and act definite value more than overvoltage protection.
Further, the locking of the step 4 kind is referred specifically to：Blocking voltage fundamental wave virtual value is fixed more than overvoltage locking
The phase of value or simultaneously locking three-phase.
Further, the overvoltage protection is using the protection that overvoltage calculating is carried out by protection equipment both end voltage difference
Module.
Beneficial effects of the present invention：
For the primary equipment of series connection access power system, occurs the two ends measurement voltage difference meeting after voltage transformer disconnection
More than the action definite value of overvoltage protection, so as to cause overvoltage protection malfunction；And the overvoltage in real system generally will not
Have so high, therefore the present invention, by setting a locking definite value between the two, calculate is had by the poor fundamental wave of protection both end voltage
Valid value size, when being more than the locking definite value by the voltage difference fundamental wave virtual value at protection equipment two ends, is judged to voltage transformer disconnection
Rather than the system failure；Sentence when being less than the locking definite value by the voltage difference fundamental wave virtual value at protection equipment two ends and being more than action definite value
For the system failure, overvoltage protection action can effectively prevent overvoltage protection misoperation caused by voltage transformer disconnection.
Brief description of the drawings
Fig. 1 is in the prior art by protection equipment and the primary connection figure of voltage transformer；
Fig. 2 is the flow chart of an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of overvoltage protection voltage transformer disconnection faulty action preventing method, comprises the following steps：
Step 1: collection is by the voltage at protection equipment two ends；
Specially：As shown in Fig. 2 being gathered respectively by the voltage transformer (PT1 and PT2) at protection equipment two ends using being located at
By the voltage at protection equipment two ends.
Step 2: calculating by the voltage difference at protection equipment two ends；
Specially：The voltage by protection equipment two ends according to being collected in step one does vector difference and obtains voltage difference, enters
And calculate voltage difference fundamental wave virtual value.
Step 3: according to the criterion of setting, carrying out voltage transformer disconnection differentiation；
The criterion set as：It will be entered by the voltage difference fundamental wave virtual value at protection equipment two ends with overvoltage locking definite value
Row compares, and when the poor fundamental wave virtual value of any phase voltage calculated is more than overvoltage locking definite value, is then determined as voltage transformer
Broken string.
Preferably, the overvoltage locking definite value be less than residing for protection equipment the voltage transformer of voltage class it is secondary
Rated value, and act definite value more than overvoltage protection.
The locking is referred specifically to：Blocking voltage fundamental wave virtual value is more than the phase of overvoltage locking definite value or locking three simultaneously
Phase, even A phases locking criterion meet, then can a locking A phase, can also simultaneously locking A, B, C three-phase.
Step 4: when being judged as voltage transformer disconnection, then instantaneous locking overvoltage protection.
The overvoltage protection is using the guarantor that overvoltage calculating is carried out by protection equipment both end voltage difference in the present invention
Protect module.
In summary：
A kind of overvoltage protection voltage transformer disconnection faulty action preventing method of the present invention, it is poor by protection both end voltage to calculate
Fundamental wave virtual value size, and it is compared with overvoltage locking definite value, judge whether occur voltage transformer disconnection, can have
Effect prevents overvoltage protection misoperation caused by voltage transformer disconnection.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method, it is characterised in that comprise the following steps：
Step 1: collection is by the voltage at protection equipment two ends；
Step 2: calculating by the voltage difference at protection equipment two ends；
Step 3: according to the criterion of setting, carrying out voltage transformer disconnection differentiation；
Step 4: when being judged as voltage transformer disconnection, then instantaneous locking overvoltage protection.
2. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 1, it is characterised in that：Institute
Stating step one is specially：Gathered respectively by the electricity at protection equipment two ends using located at by the voltage transformer at protection equipment two ends
Pressure.
3. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 1, it is characterised in that：Institute
Stating step 2 is specially：The voltage by protection equipment two ends according to being collected in step one does vector difference and obtains voltage difference, enters
And calculate voltage difference fundamental wave virtual value.
4. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 1, it is characterised in that：Institute
State the criterion that is set in step 3 as：It will be carried out by the voltage difference fundamental wave virtual value at protection equipment two ends and overvoltage locking definite value
Compare, when the poor fundamental wave virtual value of any phase voltage calculated is more than overvoltage locking definite value, be then determined as that voltage transformer breaks
Line.
5. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 4, it is characterised in that：Institute
State overvoltage locking definite value and be less than the secondary rated value of the voltage transformer of voltage class residing for protection equipment, and be more than electricity
Press protection act definite value.
6. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 4, it is characterised in that：Institute
The locking for stating step 4 kind is referred specifically to：Blocking voltage fundamental wave virtual value is more than the phase of overvoltage locking definite value or locking simultaneously
Three-phase.
7. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 1, it is characterised in that：Institute
It is using the protection module that overvoltage calculating is carried out by protection equipment both end voltage difference to state overvoltage protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239138.0A CN107017604B (en) | 2017-04-13 | 2017-04-13 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239138.0A CN107017604B (en) | 2017-04-13 | 2017-04-13 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107017604A true CN107017604A (en) | 2017-08-04 |
| CN107017604B CN107017604B (en) | 2019-07-23 |
Family
ID=59446037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710239138.0A Expired - Fee Related CN107017604B (en) | 2017-04-13 | 2017-04-13 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
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| Country | Link |
|---|---|
| CN (1) | CN107017604B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108551154A (en) * | 2018-06-22 | 2018-09-18 | 南方电网科学研究院有限责任公司 | A kind of over-voltage protection method and device |
| CN109031180A (en) * | 2018-07-26 | 2018-12-18 | 西门子电力自动化有限公司 | Detect the method and apparatus of the residual voltage state of capacitance type potential transformer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699700A (en) * | 2009-11-19 | 2010-04-28 | 河南省电力公司许昌供电公司 | Method for preventing standby power auto-switching malfunction caused by load PT break under the condition of small load |
| CN102195273A (en) * | 2010-03-10 | 2011-09-21 | 南京南瑞继保电气有限公司 | Wire-breaking judgment method in voltage transformer loop |
| CN102222876A (en) * | 2011-06-09 | 2011-10-19 | 重庆新世纪电气有限公司 | Breakage blocking differential protection method and breakage blocking differential protection system based on current transformer |
| CN102694369A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for preventing low-voltage protection misoperation of motor caused by PT disconnection |
| CN104035001A (en) * | 2014-06-25 | 2014-09-10 | 国家电网公司 | Detection method for disconnection of voltage transformers |
| CN105244856A (en) * | 2015-09-29 | 2016-01-13 | 国家电网公司 | Method for preventing distance protection misoperation caused by PT line breakage |
| CN106356814A (en) * | 2016-09-07 | 2017-01-25 | 南京南瑞继保电气有限公司 | Series transformer winding overvoltage protection method based on voltage vector difference |
-
2017
- 2017-04-13 CN CN201710239138.0A patent/CN107017604B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699700A (en) * | 2009-11-19 | 2010-04-28 | 河南省电力公司许昌供电公司 | Method for preventing standby power auto-switching malfunction caused by load PT break under the condition of small load |
| CN102195273A (en) * | 2010-03-10 | 2011-09-21 | 南京南瑞继保电气有限公司 | Wire-breaking judgment method in voltage transformer loop |
| CN102694369A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for preventing low-voltage protection misoperation of motor caused by PT disconnection |
| CN102222876A (en) * | 2011-06-09 | 2011-10-19 | 重庆新世纪电气有限公司 | Breakage blocking differential protection method and breakage blocking differential protection system based on current transformer |
| CN104035001A (en) * | 2014-06-25 | 2014-09-10 | 国家电网公司 | Detection method for disconnection of voltage transformers |
| CN105244856A (en) * | 2015-09-29 | 2016-01-13 | 国家电网公司 | Method for preventing distance protection misoperation caused by PT line breakage |
| CN106356814A (en) * | 2016-09-07 | 2017-01-25 | 南京南瑞继保电气有限公司 | Series transformer winding overvoltage protection method based on voltage vector difference |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108551154A (en) * | 2018-06-22 | 2018-09-18 | 南方电网科学研究院有限责任公司 | A kind of over-voltage protection method and device |
| CN109031180A (en) * | 2018-07-26 | 2018-12-18 | 西门子电力自动化有限公司 | Detect the method and apparatus of the residual voltage state of capacitance type potential transformer |
| CN109031180B (en) * | 2018-07-26 | 2020-08-11 | 西门子电力自动化有限公司 | Method and device for detecting residual voltage state of capacitor voltage transformer |
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| CN107017604B (en) | 2019-07-23 |
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