CN107017604B - 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
- CN107017604B CN107017604B CN201710239138.0A CN201710239138A CN107017604B CN 107017604 B CN107017604 B CN 107017604B CN 201710239138 A CN201710239138 A CN 201710239138A CN 107017604 B CN107017604 B CN 107017604B
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- China
- Prior art keywords
- voltage
- voltage transformer
- overvoltage protection
- overvoltage
- protected device
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000009471 action Effects 0.000 title claims abstract description 11
- 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
- 230000001681 protective effect Effects 0.000 claims 1
- 230000007257 malfunction Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005259 measurement Methods 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of overvoltage protection voltage transformer disconnection faulty action preventing methods, acquire the voltage at protected device both ends；Calculate the voltage difference at protected device both ends；According to the criterion of setting, voltage transformer disconnection differentiation is carried out；When being judged as voltage transformer disconnection, then overvoltage protection is instantaneously latched.The present invention is by judging that the size of the fundamental wave virtual value of protected device voltage difference of the two ends determines whether voltage transformer disconnection occurs; overvoltage protection caused by voltage transformer disconnection can be effectively prevent to malfunction; locking function of the overvoltage protection in voltage transformer disconnection is enhanced, prevents overvoltage protection caused by voltage transformer disconnection from malfunctioning.
Description
Technical field
The invention belongs to the design method fields 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 technique
In existing electric system, part primary equipment is series connection access, and same voltage class is accessed at equipment both ends, such as
Shown in Fig. 1.The voltage at equipment both ends needs to install two groups of voltage transformers, makes the difference to obtain after each measurement voltage.
When secondary break occurs for phase any in two groups of voltage transformers, resulting calculating voltage can be very big, typically larger than quilt
The overvoltage setting valve of equipment is protected, the overvoltage protection of existing series connection access device lacks CT wire break blocking and sentences
According to so as to cause overvoltage protection malfunction.
Therefore, it is necessary to a kind of quick CT wire break blocking criterions, for preventing overvoltage protection due to voltage
Transformer disconnection and malfunction.
Summary 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
The size of the fundamental wave virtual value of disconnected protected device voltage difference of the two ends determines whether that voltage transformer disconnection occurs, and can effectively prevent
Only overvoltage protection caused by voltage transformer disconnection malfunctions.
It realizes above-mentioned technical purpose, reaches above-mentioned technical effect, the invention is realized by the following technical scheme:
A kind of overvoltage protection voltage transformer disconnection faulty action preventing method, comprising the following steps:
Step 1: the voltage at acquisition protected device both ends；
Step 2: calculating the voltage difference at protected device both ends；
Step 3: carrying out voltage transformer disconnection differentiation according to the criterion of setting；
Step 4: being then instantaneously latched overvoltage protection when being judged as voltage transformer disconnection.
Further, the step 1 specifically: acquired respectively using the voltage transformer for being set to protected device both ends
The voltage at protected device both ends.
Further, the step 2 specifically: done according to the voltage at protected device collected in step 1 both ends
Vector difference obtains voltage difference, and then calculates voltage difference fundamental wave virtual value.
Further, the criterion set in the step 3 are as follows: by the voltage difference fundamental wave virtual value at protected device both ends
It is compared with overvoltage locking definite value, is latched definite value when any phase voltage difference fundamental wave virtual value calculated is greater than overvoltage,
Then it is determined as voltage transformer disconnection.
Further, the overvoltage locking definite value is less than the two of the voltage transformer of voltage class locating for protected device
Secondary rated value, and be greater than overvoltage protection and act definite value.
Further, the locking of the step 4 kind refers specifically to: it is fixed that blocking voltage fundamental wave virtual value is greater than overvoltage locking
The phase of value is latched three-phase simultaneously.
Further, the overvoltage protection is that the protection of overvoltage calculating is carried out using protected device voltage difference of the two ends
Module.
Beneficial effects of the present invention:
For the primary equipment of series connection access electric system, the both ends after voltage transformer disconnection occurs measure voltage difference meeting
Greater than the movement definite value of overvoltage protection, so as to cause overvoltage protection malfunction；And the overvoltage in real system usually will not
Have it is so high, therefore the present invention by between the two be arranged a locking definite value, calculating is had by protection voltage difference of the two ends fundamental wave
Valid value size, when protected device both ends voltage difference fundamental wave virtual value be greater than the locking definite value, be judged to voltage transformer disconnection
Rather than the system failure；Sentence when the voltage difference fundamental wave virtual value at protected device both ends is less than the locking definite value and is greater than movement definite value
For the system failure, overvoltage protection movement can effectively prevent overvoltage protection caused by voltage transformer disconnection to malfunction.
Detailed description of the invention
Fig. 1 is the primary connection figure of protected device and voltage transformer in the prior art；
Fig. 2 is the flow chart of an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention 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.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of overvoltage protection voltage transformer disconnection faulty action preventing method, comprising the following steps:
Step 1: the voltage at acquisition protected device both ends；
Specifically: as shown in Fig. 2, being acquired respectively using the voltage transformer (PT1 and PT2) for being set to protected device both ends
The voltage at protected device both ends.
Step 2: calculating the voltage difference at protected device both ends；
Specifically: vector difference is done according to the voltage at protected device collected in step 1 both ends and obtains voltage difference, into
And calculate voltage difference fundamental wave virtual value.
Step 3: carrying out voltage transformer disconnection differentiation according to the criterion of setting；
The criterion of the setting are as follows: by the voltage difference fundamental wave virtual value at protected device both ends and overvoltage be latched definite value into
Row compares, and is latched definite value when any phase voltage difference fundamental wave virtual value calculated is greater than overvoltage, is then determined as voltage transformer
Broken string.
Preferably, the overvoltage locking definite value is less than the secondary of the voltage transformer of voltage class locating for protected device
Rated value, and be greater than overvoltage protection and act definite value.
The locking refers specifically to: blocking voltage fundamental wave virtual value is greater than the phase of overvoltage locking definite value or is latched three simultaneously
Phase, even A phase locking criterion meet, then can only be latched A phase, can also be latched A, B, C three-phase simultaneously.
Step 4: being then instantaneously latched overvoltage protection when being judged as voltage transformer disconnection.
The overvoltage protection is that the guarantor of overvoltage calculating is carried out using protected device voltage difference of the two ends in the present invention
Protect module.
In summary:
A kind of overvoltage protection voltage transformer disconnection faulty action preventing method of the invention, calculates by protection voltage difference of the two ends
Fundamental wave virtual value size, and it is compared with overvoltage locking definite value, judge whether that voltage transformer disconnection occurs, can have
Effect prevents overvoltage protection caused by voltage transformer disconnection from malfunctioning.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, 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 (3)
1. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method, which comprises the following steps:
Step 1: the voltage at acquisition protected device both ends；
Step 2: the voltage difference at protected device both ends is calculated, the calculating of the voltage difference for calculating protected device both ends
Journey are as follows: vector difference is done according to the voltage at protected device collected in step 1 both ends and obtains voltage difference, and then calculates electricity
Pressure difference fundamental wave virtual value；
Step 3: carrying out voltage transformer disconnection differentiation, the criterion of the setting are as follows: will be set by protection according to the criterion of setting
The voltage difference fundamental wave virtual value at standby both ends is compared with overvoltage locking definite value, when any phase voltage difference fundamental wave calculated has
Valid value is greater than overvoltage and is latched definite value, then is determined as voltage transformer disconnection；The overvoltage locking definite value is less than to be set by protection
The secondary rated value of the voltage transformer of standby locating voltage class, and be greater than overvoltage protection and act definite value；
Step 4: then instantaneously locking overvoltage protection, the locking refer specifically to when being judged as voltage transformer disconnection: only
Blocking voltage fundamental wave virtual value is greater than the phase of overvoltage locking definite value or is latched three-phase simultaneously.
2. a kind of overvoltage protection voltage transformer disconnection faulty action preventing method according to claim 1, it is characterised in that: institute
State step 1 specifically: acquire the electricity at protected device both ends respectively using the voltage transformer for being set to protected device both 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 overvoltage protection is that the protective module of overvoltage calculating is carried out using protected device voltage difference of the two ends.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN107017604A CN107017604A (en) | 2017-08-04 |
| CN107017604B true CN107017604B (en) | 2019-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Families Citing this family (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 |
| 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 |
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 |
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| CN107017604A (en) | 2017-08-04 |
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