CN107515353A - A kind of bis- neutral conductor operation intelligent monitors of PT/CT - Google Patents
A kind of bis- neutral conductor operation intelligent monitors of PT/CT Download PDFInfo
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- CN107515353A CN107515353A CN201710807269.4A CN201710807269A CN107515353A CN 107515353 A CN107515353 A CN 107515353A CN 201710807269 A CN201710807269 A CN 201710807269A CN 107515353 A CN107515353 A CN 107515353A
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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
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Abstract
The invention provides a kind of bis- neutral conductors operation intelligent monitors of PT/CT, including one is used for the secondary neutral current induction module that senses bis- neutral currents of PT/CT, and bis- neutral conductors of input and PT/CT of secondary neutral current induction module are connected；One is used to the output end of secondary neutral current induction module be connected according to bis- neutral current sizes of PT/CT, the size of current determination module of selection the first or second control signal output, the input of size of current determination module；One is used to receive the break alarm module that the first control signal realizes alarm, and break alarm module is connected with the first output end of size of current determination module；And/or a grounding alarm module for receiving the realization alarm of the second control signal, grounding alarm module are connected with the second output end of size of current determination module.Implement the present invention, multipoint earthing or broken string phenomenon and and alarm when can detect bis- neutral conductor operations of PT/CT in real time.
Description
Technical field
The present invention relates to Grounding Technology of Modern Power System field, more particularly to a kind of bis- neutral conductor operation intelligence prisons of PT/CT
Survey instrument.
Background technology
As shown in figure 1, provided according to the relevant technical measures of power system, bis- neutral conductor fortune of PT/CT in network system
Row only and can only have an earth point o.
However, as shown in Fig. 2 due to the insulation ag(e)ing of secondary winding neutral conductor long operational time, technical staff's Maintenance and Repair
The factor such as breakdown is insured in middle insulation damages, thunderbolt second breakdown, causes to be additionally formed new earth point m.Now, power train is worked as
During unified transmission facility generation ground short circuit failure, potential difference △ is produced between intrinsic earth point o and new formation earth point m
U so that the phase voltage that protective relaying device senses（Uan、Ubn、Ucn）No longer be consistent with real voltage, and introduce after
The voltage of electric protection protection device is not real U but U/=U+ △ U.Due to random potential difference △ U be present so that solid
Having between earth point o and new formation earth point m, there is earth current to form circulation after flowing through, therefore the circulation may make zero sequence
Direction（F0）And the element incorrect operation such as power frequency variation distance（Tripping or malfunction）.
In addition, if one point earth point o loose contacts or disconnection, earth current is in 0mA on the secondary winding neutral conductor
Left and right, protective relaying device is also sensed less than normal fault current in normal operation, if handling not in time, can equally lead
Cause relay protection incorrect operation.Therefore, multipoint earthing or broken string cause power network when whether bis- neutral conductors of PT/CT are run
Accident occurs, and electric grid large area power cut is caused when serious, brings economic loss, influences social stability.
To sum up, a kind of bis- neutral conductors operation Intelligent monitoring devices of PT/CT are needed badly, can be detected in real time in PT/CT bis- times
Property line operation when multipoint earthing or broken string phenomenon and and alarm.
The content of the invention
It is an object of the invention to overcome shortcoming and deficiency of the prior art, there is provided a kind of bis- neutral conductor fortune of PT/CT
Row intelligent monitor, multipoint earthing or broken string phenomenon and and alarm when can detect bis- neutral conductor operations of PT/CT in real time.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of bis- neutral conductor operation intelligence prisons of PT/CT
Instrument is surveyed, including：
The one secondary neutral current induction module for sensing bis- neutral currents of PT/CT, the secondary neutral current
Bis- neutral conductors of the input of induction module and PT/CT are connected；
One is used for according to described bis- neutral current sizes of PT/CT, selects the first control signal or the output of the second control signal
Size of current determination module, the input of the size of current determination module and the secondary neutral current induction module
Output end is connected；
One is used to receive the break alarm module that first control signal realizes alarm, the break alarm module and the electricity
First output end of stream size determination module is connected；And/or
One is used to receive the grounding alarm module that second control signal realizes alarm, the grounding alarm module and the electricity
Second output end of stream size determination module is connected.
Wherein, the secondary neutral current induction module is formed by hall sensor.
Wherein, the size of current determination module is formed by ARM chips and its peripheral circuit.
Wherein, the break alarm module is formed by relay and buzzer or formed by relay and indicator lamp.
Wherein, the grounding alarm module is formed by relay and buzzer or formed by relay and indicator lamp.
Wherein, the secondary neutral current induction module, size of current determination module, break alarm module and/or connect
Ground alarm module is integrated in same cabinet.
Compared with prior art, the invention has the advantages that and beneficial effect：
Bis- neutral conductor operation intelligent monitors of PT/CT of the embodiment of the present invention, can sense mould by secondary neutral current
Block senses bis- neutral currents of PT/CT in real time, and judges to select the first control signal or the through size of current determination module
Two control signals, so that break alarm module produces alarm or grounding alarm module produces alarm, reach detection PT/ in real time
During the operation of bis- neutral conductors of CT multipoint earthing or broken string phenomenon and and alarm purpose.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the connection diagram that bis- neutral conductors of PT/CT only have one point earth in the prior art；
Fig. 2 is the connection diagram that bis- neutral conductors of PT/CT form multipoint earthing in the prior art；
Fig. 3 is that bis- neutral conductors of PT/CT provided in the embodiment of the present invention run earthing combined floodgate identification mould in intelligent monitor
The structural representation of block；
Fig. 4 is that bis- neutral conductors of PT/CT provided in the embodiment of the present invention run the application scenario diagram of intelligent monitor.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As shown in figure 3, in the embodiment of the present invention, a kind of bis- neutral conductor operation intelligent monitors of PT/CT of proposition, to wrap
Include：
The one secondary neutral current induction module 1 for sensing bis- neutral currents of PT/CT, secondary neutral current sensing
The input of module 1 and bis- neutral conductors of PT/CT（It is not shown）It is connected；
One is used for according to bis- neutral current sizes of PT/CT, selects the electricity of the first control signal or the output of the second control signal
Flow size determination module 2, the input a1 of size of current determination module 2 and secondary neutral current induction module 1 output end
It is connected；
One is used to receive the break alarm module 3 that the first control signal realizes alarm, and break alarm module 3 judges with size of current
First output end a2 of module 2 is connected；And/or
One is used to receive the grounding alarm module 4 that the second control signal realizes alarm, and grounding alarm module 4 judges with size of current
Second output end a3 of module 2 is connected.
It should be noted that size of current determination module 2 selects the first control signal or the output of the second control signal, it is logical
Bis- neutral currents of contrast PT/CT are crossed with default two current thresholds thereon to realize.For example, two current threshold difference
For broken string current threshold and earth current threshold value, when bis- neutral currents of PT/CT<During broken string current threshold, the control of output first
Signal processed, and bis- neutral currents of PT/CT>During earth current threshold value, the second control signal is exported.
It is understood that size of current determination module 2 can also connect the display module formed by liquid crystal display, it is aobvious in real time
Show bis- neutral currents of PT/CT.
In embodiments of the present invention, secondary neutral current induction module 1 is formed by hall sensor, and size of current judges
Module 2 is formed by ARM chips and its peripheral circuit, break alarm module 3 formed by relay and buzzer or by relay and
Indicator lamp is formed, and grounding alarm module 4 is formed by relay and buzzer or formed by relay and indicator lamp.Certainly, in order to
Type of alarm is distinguished, sound size caused by the buzzer in break alarm module 3 and grounding alarm module 4 can be set
For difference, light color caused by the indicator lamp in break alarm module 3 and grounding alarm module 4 can also be arranged to not
Together.
In embodiments of the present invention, secondary neutral current induction module 1, size of current determination module 2, break alarm mould
Block 3 and/or grounding alarm module 4 are integrated in same cabinet, are easy to carry and are managed.
The operation principle of bis- neutral conductor operation intelligent monitors of PT/CT is in the embodiment of the present invention：Due to secondary neutrality
Line current induction module 1 senses bis- neutral currents of PT/CT in real time, judges through size of current determination module 2 in PT/CT bis- times
Property line current size, select break alarm module 3 or grounding alarm module 4 to alarm.Certainly, if bis- neutral conductor electricity of PT/CT
Flow threshold range of the size set by without departing from size of current determination module 2, then will not output control signal.
As shown in figure 4, the application scenarios of bis- neutral conductors of PT/CT in embodiment of the present invention operation intelligent monitors are done into
One step explanation：
Cabinet top is provided with：Input IN, output OUT, D/C power input, power switch
Cabinet fronts are provided with：Instrument running indicator, earth lamp, broken string lamp, display screen etc..
Compared with prior art, the invention has the advantages that and beneficial effect：
Bis- neutral conductor operation intelligent monitors of PT/CT of the embodiment of the present invention, can sense mould by secondary neutral current
Block senses bis- neutral currents of PT/CT in real time, and judges to select the first control signal or the through size of current determination module
Two control signals, so that break alarm module produces alarm or grounding alarm module produces alarm, reach detection PT/ in real time
During the operation of bis- neutral conductors of CT multipoint earthing or broken string phenomenon and and alarm purpose.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (6)
- A kind of 1. bis- neutral conductor operation intelligent monitors of PT/CT, it is characterised in that including：The one secondary neutral current induction module for sensing bis- neutral currents of PT/CT（1）, the secondary neutral conductor electricity Flow induction module（1）Bis- neutral conductors of input and PT/CT be connected；One is used for according to described bis- neutral current sizes of PT/CT, selects the first control signal or the output of the second control signal Size of current determination module（2）, the size of current determination module（2）Input sense with the secondary neutral current Module（1）Output end be connected；One is used to receive the break alarm module that first control signal realizes alarm（3）, the break alarm module（3）With The size of current determination module（2）The first output end be connected；And/orOne is used to receive the grounding alarm module that second control signal realizes alarm（4）, the grounding alarm module（4）With The size of current determination module（2）The second output end be connected.
- 2. bis- neutral conductor operation intelligent monitors of PT/CT as claimed in claim 1, it is characterised in that the secondary neutrality Line current induction module（1）Formed by hall sensor.
- 3. bis- neutral conductor operation intelligent monitors of PT/CT as claimed in claim 2, it is characterised in that the size of current Determination module（2）Formed by ARM chips and its peripheral circuit.
- 4. bis- neutral conductor operation intelligent monitors of PT/CT as claimed in claim 3, it is characterised in that the break alarm Module（3）Formed by relay and buzzer or formed by relay and indicator lamp.
- 5. bis- neutral conductor operation intelligent monitors of PT/CT as claimed in claim 4, it is characterised in that the grounding alarm Module（4）Formed by relay and buzzer or formed by relay and indicator lamp.
- 6. bis- neutral conductor operation intelligent monitors of PT/CT as claimed in claim 5, it is characterised in that the secondary neutrality Line current induction module（1）, size of current determination module（2）, break alarm module（3）And/or grounding alarm module（4）It is integrated In same cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710807269.4A CN107515353A (en) | 2017-09-08 | 2017-09-08 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710807269.4A CN107515353A (en) | 2017-09-08 | 2017-09-08 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
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| CN107515353A true CN107515353A (en) | 2017-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710807269.4A Pending CN107515353A (en) | 2017-09-08 | 2017-09-08 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
| CN113447705A (en) * | 2021-06-21 | 2021-09-28 | 深圳供电局有限公司 | Device and method for keeping secondary neutral point of voltage transformer grounded |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121958A (en) * | 2010-01-07 | 2011-07-13 | 王世祥 | Device and method for monitoring neutral point earthing of secondary winding of electric power current and voltage mutual inductor |
| CN102801131A (en) * | 2012-09-06 | 2012-11-28 | 重庆大学 | Neutral line breaking detection protection method and device |
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and locating hidden defect of TV secondary neutral line for relay protection |
| CN103592564A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation |
| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| CN207318618U (en) * | 2017-09-08 | 2018-05-04 | 深圳供电局有限公司 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
-
2017
- 2017-09-08 CN CN201710807269.4A patent/CN107515353A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121958A (en) * | 2010-01-07 | 2011-07-13 | 王世祥 | Device and method for monitoring neutral point earthing of secondary winding of electric power current and voltage mutual inductor |
| CN102801131A (en) * | 2012-09-06 | 2012-11-28 | 重庆大学 | Neutral line breaking detection protection method and device |
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and locating hidden defect of TV secondary neutral line for relay protection |
| CN103592564A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation |
| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| CN207318618U (en) * | 2017-09-08 | 2018-05-04 | 深圳供电局有限公司 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
| CN108957203B (en) * | 2018-05-22 | 2021-02-09 | 南京南瑞继保电气有限公司 | Method for detecting PT neutral line disconnection |
| CN113447705A (en) * | 2021-06-21 | 2021-09-28 | 深圳供电局有限公司 | Device and method for keeping secondary neutral point of voltage transformer grounded |
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Application publication date: 20171226 |