CN106877285B - The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection is not configured - Google Patents
The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection is not configured Download PDFInfo
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- CN106877285B CN106877285B CN201710182386.6A CN201710182386A CN106877285B CN 106877285 B CN106877285 B CN 106877285B CN 201710182386 A CN201710182386 A CN 201710182386A CN 106877285 B CN106877285 B CN 106877285B
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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
- H02H3/24—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 undervoltage or no-voltage
- H02H3/253—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 undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Hybrid Electric Vehicles (AREA)
- Control Of Multiple Motors (AREA)
Abstract
The present invention relates to a kind of station-service subsidiary engine CT thread-breakage protectings that differential protection is not configured and station-service subsidiary engine protective relaying devices; the station-service subsidiary engine has motor; wherein method includes that two sections of protections of the one section of protection of CT broken strings and CT broken strings are respectively set for the station-service subsidiary engine of differential protection is not configured; individually adjust the second definite values of first definite value and CT two sections of protections of broken string of described one section of protection of CT broken strings; when one section of current value of CT broken strings reaches the first definite value, one section of tripping is controlled；When two sections of current value of CT broken strings reaches the second definite value, two sections of trippings or alarm are controlled.The present invention as individually protection, configures CT broken strings in not differential station-service subsidiary engine protective relaying device, realizes CT broken string trippings, avoids burning apparatus, expand accident.
Description
Technical field
The present invention relates to CT burn out detection fields, are specifically related to a kind of station-service subsidiary engine CT broken strings that differential protection is not configured
Guard method and relay system.
Background technology
CT broken string inspections are one that the place of circuit disconnection is checked using current transformer (current transformer)
Kind technology.The principle of CT burn out detection is highly developed at present, and most of microcomputer type protective relaying devices all configure CT broken strings
Detection function.CT broken strings only play two in existing microcomputer type protective relaying device：First, being reported after detecting CT broken strings
It is alert；It Blocking Differential Protection and alarms second is that the locking criterion as differential protection, after CT broken strings.By actual motion for many years,
CT broken strings have been considered as a kind of malfunction, are not latched differential being total to as relay protection fixed value setting calculating after CT broken strings
Know.But for the station-service subsidiary engine of differential protection is not configured, CT broken strings are still only alarmed, station-service subsidiary engine emerged in operation
Many cases for not finding and burning current transformer or auxiliary bus bar in time because of the roots CT broken string.
Invention content
For the deficiencies in the prior art, it is disconnected that the present invention provides a kind of station-service subsidiary engine CT that differential protection is not configured
Line guard method is configured by CT broken strings as individually protection in not differential station-service subsidiary engine protective relaying device, is realized
The tripping of CT broken strings or alarm, avoid burning apparatus, expand accident.
To achieve the goals above, the present invention uses following scheme：
A kind of station-service subsidiary engine CT thread-breakage protectings that differential protection is not configured, the station-service subsidiary engine have motor, are
Two sections of protections of the one section of protection of CT broken strings and CT broken strings are respectively set in the station-service subsidiary engine that differential protection is not configured, and individually adjust the CT
Second definite values of first definite value and CT two sections of protections of broken string of one section of protection of broken string, when one section of current value of CT broken strings reaches first
When definite value, one section of tripping is controlled；When two sections of current value of CT broken strings reaches the second definite value, two sections of trippings or alarm are controlled.
Further, this method further includes individually adjusting two sections of the first delay and the CT broken strings of one section of protection of the CT broken strings
Second delay of protection, when CT break one section of current value reach the first definite value when or when break two sections of current values of CT reach the
When two definite values, after above-mentioned delay, two sections of trippings of one section of tripping or control or alarm are controlled.
Further, this method further includes individually adjusting the inputs of the described one section of protection of CT broken strings and CT two sections of protections of broken string
With exit.
Further, if the CT breaks the relay protective scheme of one section of protection be phase broken string occurs, two-phase broken string, three-phase break
Line, center line broken string or CT, which break one section, to be put into, then controls one section of tripping.
The technical solution is to devise individual CT breaking protections without configuring the station-service subsidiary engine of differential protection, according to two sections
The tripping of CT broken strings or alarm may be implemented in CT breaking protections.
Further, if the CT breaks, the relay protective scheme of two sections of protections is that one phase of generation broken string, two-phase broken string or CT are disconnected
Two sections of inputs of line, then control two sections of trippings or alarm.
Further, the action message of single-phase wire break when this method is run according to induction-motor load, and do not consider that negative phase-sequence is protected
It protects to adjust the first definite value.
Further, the action message of single-phase wire break adjusts the second definite value when this method is run according to motor no-load.
Further, protection longest actuation time when this method occurs according to external single-phase fault or phase to phase fault adjusts
First delay.
Further, this method adjusts the second delay according to motor starting time.
The present invention also provides a kind of station-service subsidiary engine protective relaying devices that differential protection is not configured, disconnected using above-mentioned CT
Line guard method.
Beneficial effects of the present invention：
(1) present invention is devises individual CT breaking protections without the station-service subsidiary engine for configuring differential protection, according to two sections
The tripping of CT broken strings or alarm may be implemented in CT breaking protections.
(2) present invention is configured by CT broken strings as individually protection in not differential station-service subsidiary engine protective relaying device
In, it realizes CT broken string trippings, avoids burning apparatus, expand accident.
Description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Specific implementation mode：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
Just as mentioned in the background art, for the station-service subsidiary engine of differential protection is not configured, CT broken strings are still only alarmed,
Station-service subsidiary engine emerged in operation is many because the roots CT broken string is not found in time and burns current transformer or station-service is female
The case of line.
The present invention is to solve the above problems, propose a kind of exemplary embodiments：The station-service subsidiary engine CT of differential protection is not configured
Thread-breakage protecting, the station-service subsidiary engine have motor, as shown in Figure 1, for the station-service subsidiary engine point of differential protection is not configured
Not She Zhi CT break one section protection and CT break two sections protection, individually adjust CT break one section protection the first definite value and CT broken string
Two sections of second definite values protected, individually adjust the first delay that one section of CT broken strings are protected and second that two sections of CT broken strings are protected is prolonged
When, it individually adjusts the inputs of described one section of protection of CT broken strings and the two sections of protections of CT broken strings and exits.
When one section of current value of CT broken strings reaches the first definite value, one section of tripping is controlled；When two sections of current value of CT broken strings
When reaching the second definite value, two sections of trippings or alarm are controlled.
Table 1
CT break one section protection relay protective scheme be：
Table 2
Have 6 input conditions in table 2, first three condition breaks for three-phase or center line, rear three conditions for a phase or
Two-phase breaks；Ie is the secondary rated current of motor in condition 2.
CT break two sections protection relay protective schemes be：
Table 3
The principle of fixed value adjusting is in the present embodiment：Protective device will produce negative-sequence current, DLT1502- when CT breaks
2016 suggestion motor negative phase-sequence trip ratings should reliably escape CT broken strings, adjust as 50%~100%Ie, so CT breaks one section
Current ration is adjusted without considering passive moods.CT one section of current ration of broken string is single-phase disconnected when can be by motor large load operation
Line action message is adjusted, and one section of electric current Iset1 can adjust as 50%~80%Ie, and one section of tripping delay will escape external single-phase
Longest actuation time is protected when failure or phase to phase fault, it is proposed that take 4s~20s.Two sections of current rations of CT breaking protections can be by electricity
Single-phase wire break action message is adjusted when motivation no-load running, and No-load current is generally 20%~45%Ie, one section of electric current
Iset1 can adjust as 10%~20%Ie, and two sections of trippings or alarm delay are suggested escaping motor starting time, and (Ie is electronic
The secondary rated current of machine).
The present embodiment can be to devise individual CT breaking protections without configuring the station-service subsidiary engine of differential protection, according to two
The tripping of CT broken strings or alarm may be implemented in section CT breaking protections.
One more embodiment of the present invention is a kind of station-service subsidiary engine protective relaying device that differential protection is not configured, and use is above-mentioned
CT thread-breakage protectings.
Two sections of protections of the one section of protection of CT broken strings and CT broken strings are respectively set in protective relaying device, two sections of definite values can be single
It solely adjusts, every section of delay can be adjusted individually, and outlet mode can be adjusted to trip or alarming, and every section of protection can be individually whole
Fixed throw is moved back, and relay protection is carried out using above-mentioned CT breaking protections logic.
The present embodiment as individually protection, configures CT broken strings in not differential station-service subsidiary engine protective relaying device
In, CT broken string trippings are realized, burning apparatus is avoided, expands accident.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of station-service subsidiary engine CT thread-breakage protectings that differential protection is not configured, the station-service subsidiary engine has motor, special
Sign is：Two sections of protections of the one section of protection of CT broken strings and CT broken strings are respectively set in station-service subsidiary engine for differential protection is not configured, individually
The second definite values for adjusting first definite value and CT two sections of protections of broken string of described one section of protection of CT broken strings, when one section of electric current of CT broken strings
When value reaches the first definite value, one section of tripping is controlled；When two sections of current value of CT broken strings reaches the second definite value, two sections of trippings are controlled
Or alarm.
2. according to the method described in claim 1, it is characterized in that：Further include individually adjusting the CT to break the of one section of protection
One is delayed is delayed with the second of CT two sections of protections of broken string, when one section of current value of CT broken strings reaches the first definite value, by first
After delay, one section of tripping is controlled；When two sections of current value of CT broken strings reaches the second definite value, after the second delay, control two
Section tripping or alarm.
3. according to the method described in claim 2, it is characterized in that：Further include individually adjusting described one section of protection of CT broken strings and CT
Break the inputs and exit that two sections are protected.
4. according to the method described in claim 3, it is characterized in that：If the CT breaks, the relay protective scheme of one section of protection is to occur
One phase broken string, two-phase broken string, three-phase broken string, center line broken string or CT, which break one section, to be put into, then controls one section of tripping.
5. according to the method described in claim 3, it is characterized in that：If the CT breaks, the relay protective scheme of two sections of protections is to occur
One phase broken string, two-phase broken string or CT, which break two sections, to be put into, then controls two sections of trippings or alarm.
6. method according to any one of claim 1-3, it is characterised in that：It is single-phase disconnected when being run according to induction-motor load
The action message of line, and passive moods are not considered to adjust the first definite value.
7. method according to any one of claim 1-3, it is characterised in that：It is single-phase disconnected when being run according to motor no-load
The action message of line adjusts the second definite value.
8. according to the method in claim 2 or 3, it is characterised in that：When being occurred according to external single-phase fault or phase to phase fault
Protection longest actuation time adjust the first delay.
9. according to the method in claim 2 or 3, it is characterised in that：The second delay is adjusted according to motor starting time.
10. a kind of station-service subsidiary engine protective relaying device that differential protection is not configured, which is characterized in that using such as claim 1-9
Any one of described in CT thread-breakage protectings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710182386.6A CN106877285B (en) | 2017-03-24 | 2017-03-24 | The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection is not configured |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710182386.6A CN106877285B (en) | 2017-03-24 | 2017-03-24 | The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection is not configured |
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| CN106877285A CN106877285A (en) | 2017-06-20 |
| CN106877285B true CN106877285B (en) | 2018-10-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201975755U (en) * | 2011-03-11 | 2011-09-14 | 上海诺雅克电气有限公司 | Current diagnosis device for monitoring state of current transformer |
| CN103580006A (en) * | 2012-07-19 | 2014-02-12 | 宝钢不锈钢有限公司 | CT broken line discrimination method during bus protection |
| CN104158149A (en) * | 2014-07-10 | 2014-11-19 | 国家电网公司 | Intelligent leakage protector provided with broken null line protection function and broken null line protection method |
| CN105870880A (en) * | 2016-03-28 | 2016-08-17 | 国网天津市电力公司 | Intelligent protection system for secondary open circuit of current transformer |
| CN106371049A (en) * | 2016-08-31 | 2017-02-01 | 贵州电网有限责任公司贵阳供电局 | Current transformer secondary open circuit identification method |
-
2017
- 2017-03-24 CN CN201710182386.6A patent/CN106877285B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201975755U (en) * | 2011-03-11 | 2011-09-14 | 上海诺雅克电气有限公司 | Current diagnosis device for monitoring state of current transformer |
| CN103580006A (en) * | 2012-07-19 | 2014-02-12 | 宝钢不锈钢有限公司 | CT broken line discrimination method during bus protection |
| CN104158149A (en) * | 2014-07-10 | 2014-11-19 | 国家电网公司 | Intelligent leakage protector provided with broken null line protection function and broken null line protection method |
| CN105870880A (en) * | 2016-03-28 | 2016-08-17 | 国网天津市电力公司 | Intelligent protection system for secondary open circuit of current transformer |
| CN106371049A (en) * | 2016-08-31 | 2017-02-01 | 贵州电网有限责任公司贵阳供电局 | Current transformer secondary open circuit identification method |
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| CN106877285A (en) | 2017-06-20 |
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