CN105182046A - Current voltage transformer secondary neutral grounding current acquisition device - Google Patents
Current voltage transformer secondary neutral grounding current acquisition device Download PDFInfo
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- CN105182046A CN105182046A CN201510619255.0A CN201510619255A CN105182046A CN 105182046 A CN105182046 A CN 105182046A CN 201510619255 A CN201510619255 A CN 201510619255A CN 105182046 A CN105182046 A CN 105182046A
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Abstract
A current voltage transformer secondary neutral grounding current acquisition device provided by the present invention comprises a first branch, a second branch and a voltage source, and the first branch comprises a current inductor, a first relay and a second relay. The current inductor is used to sense a grounding line current and generate a current signal, the first relay is used to close a first normally open contact when the sensed current is greater than a preset threshold value, and the first branch is conducted with the voltage source. The second relay is used to close a second normally open contact when the first relay is closed, and the second branch comprises a third relay and an alarm part. The third relay is used to close a third normally open contact when the second relay is closed, the second branch is conducted with the voltage source, and the alarm part is used to output an alarm signal when the second branch is conducted with the voltage source. By implementing the current voltage transformer secondary neutral grounding current acquisition device of the present invention, the current of a switch place can be acquired timely, a current voltage transformer secondary grounding fault can be determined effectively, the potential safety hazards can be noticed and eliminated timely, and the safe and stable operation of a power grid is guaranteed.
Description
Technical field
The present invention relates to current-voltage transformer secondary neutral ground technical field, particularly relate to a kind of current-voltage transformer secondary neutral ground current collecting device.
Background technology
At present, often there is problem more or less in the current-voltage transformer secondary neutral line, as multipoint earthing, loose contact, wiring error etc., thus causes secondary branch voltage abnormal, cause protection incorrect operation, bring serious harm.
As shown in Figure 1; when current-voltage transformer secondary is respectively at switch place (as N point) and pulpit ground connection (as grounded neutral wire N600); if system generation earth fault; substation ground network will flow through major break down electric current; potential difference (PD) Δ U is produced between N point and O point; N point, O point and grounded neutral wire N600 is made to form branch road; thus cause neutral point voltage phase place to occur skew; affect amplitude and the phase place of phase voltage and residual voltage, even may cause the serious consequences such as distance protection, zero-sequence voltage injection tripping or malfunction.
Therefore, need a kind of current-voltage transformer secondary neutral ground current collecting device badly, the electric current in switch place can be gathered in time, effectively judge current-voltage transformer secondary earth fault, timely notice also eliminates safe hidden trouble, thus ensures power network safety operation.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, a kind of current-voltage transformer secondary neutral ground current collecting device is provided, the electric current in switch place can be gathered in time, effective judgement current-voltage transformer secondary earth fault, timely notice also eliminates safe hidden trouble, and guarantees power network safety operation.
In order to solve the problems of the technologies described above, embodiments provide a kind of current-voltage transformer secondary neutral ground current collecting device, it matches with switch place ground wire, described device comprises the first branch road and the second branch road that are in parallel, and is in series into the voltage source in loop with the first branch road after described parallel connection and the second branch road; Wherein,
Described first branch road comprises current inductor, the first relay and the second relay; Wherein, one end of described current inductor is connected with described switch place ground wire, and the other end is connected with the coil control end of described first relay, for responding to the real-time current of described switch place ground wire and generating current signal; Described first relay comprises the first normally opened contact, one end of described first normally opened contact is connected with one end of described voltage source, the other end is connected with the other end of described voltage source after being connected with the coil control end of described second relay, during for being greater than its default threshold value at the electric current getting the induction of described current inductor, its first normally opened contact closed, realizes described first branch road and described voltage source is conducted; Described second relay comprises the second normally opened contact, one end of described second normally opened contact is connected with the other end of described voltage source, the other end is connected with described second branch road, for when the first normally opened contact of described first relay closes, and closed described second normally opened contact;
Described second branch road comprises the 3rd relay and alarm components; Wherein, the coil control end of described 3rd relay is connected with the other end of the second normally opened contact of described second relay, and described 3rd relay also comprises the 3rd normally opened contact, one end of described 3rd normally opened contact is connected by described alarm components one end with described voltage source, the other end is connected with the other end of described voltage source, for when the second normally opened contact of described second relay closes, closed described 3rd normally opened contact, realizes described second branch road and described voltage source is conducted; Described alarm components is arranged between the 3rd normally opened contact of described voltage source and described 3rd relay, for when described second branch road and described voltage source are conducted, and outputting alarm signal.
Wherein, described second relay also comprises the 4th normally opened contact, and described four normally opened contacts are connected with external signal analytical equipment, for exporting described current signal to described external signal analytical equipment.
Wherein, described device also comprises display device, described display device is arranged between the coil control end of described current inductor and described first relay, the electric current that described display device is sensed for being shown described current inductor by the mode of figure or image.
Wherein, described 3rd relay is also provided with reset button, and described reset button disconnects for the 3rd normally opened contact realizing described 3rd relay.
Wherein, described alarm components is light emitting diode, and the positive pole of described light emitting diode is connected with the positive pole of described voltage source, and negative pole is connected with the negative pole of described voltage source with the 3rd normally opened contact by described 3rd relay.
Wherein, the output voltage of described voltage source is the alternating voltage of 220V or the DC voltage of 12V.
Implement the embodiment of the present invention, there is following beneficial effect:
In embodiments of the present invention, because device is by the loop current of current inductor inductive switch place ground wire, and this loop current is when being greater than default threshold value, control closed first relay, the second relay and the 3rd relay, realize alarm components alarm (as lumination of light emitting diode), thus the electric current in switch place can be gathered in time, effective judgement current-voltage transformer secondary earth fault, reach and notify and eliminate safe hidden trouble in time, guarantee the object of power network safety operation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
Fig. 1 is the circuit connection diagram that in prior art, current-voltage transformer secondary neutral ground fault forms loop;
The circuit connection diagram of the current-voltage transformer secondary neutral ground current collecting device that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 2, for a kind of current-voltage transformer secondary neutral ground current collecting device that the embodiment of the present invention provides, it matches with switch place ground wire K, device comprises the first branch road and the second branch road that are in parallel, and is in series into the voltage source U in loop with the first branch road after parallel connection and the second branch road; Wherein,
First branch road comprises current inductor M, the first relay J 1 and the second relay J 2; Wherein, one end of current inductor M is connected with switch place ground wire K, and the other end is connected with the coil control end of the first relay, for inductive switch place ground wire K real-time current and generate current signal; First relay J 1 comprises the first normally opened contact J1-1, one end of first normally opened contact J1-1 is connected with one end of voltage source U, the other end is connected with the other end of voltage source U after being connected with the coil control end of the second relay J 2, during for being greater than its default threshold value at the electric current getting current inductor M induction, closed its first normally opened contact J1-1, realizes the first branch road and voltage source U is conducted; Second relay J 2 comprises the second normally opened contact J2-1, one end of second normally opened contact J2-1 is connected with the other end of voltage source U, the other end is connected with the second branch road, for when the first normally opened contact J1-1 of the first relay J closes, and closed second normally opened contact J2-1;
Second branch road comprises the 3rd relay J 3 and alarm components LD; Wherein, the coil control end of the 3rd relay J 3 is connected with the other end of the second normally opened contact J2-1 of the second relay J 2, and the 3rd relay J 3 also comprises the 3rd normally opened contact J3-1, one end of 3rd normally opened contact J3-1 is connected with one end of voltage source U by alarm components LD, the other end is connected with the other end of voltage source U, for when the second normally opened contact J2-1 of the second relay J 2 closes, closed 3rd normally opened contact J3-1, realizes the second branch road and voltage source U is conducted; Alarm components LD is arranged between voltage source U and the 3rd normally opened contact J3-1 of the 3rd relay J 3, for when the second branch road and voltage source U are conducted, and outputting alarm signal.
It should be noted that the voltage and current in order to balance circuit in whole device, in device, adopting multiple load, as resistance R1, R2 and R3.
In order to analyze the real-time current of switch place ground wire K further, therefore the second relay J 2 also comprises the 4th normally opened contact J2-2, four normally opened contact J2-2 are connected with external signal analytical equipment, for output current signal to external signal analytical equipment.
In order to observe the electric current real-time change situation of switch place ground wire K in time, therefore device also comprises display device S, display device S is arranged between the coil control end of current inductor M and the first relay J 1, the electric current that display device S is sensed for being shown current inductor M by the mode of figure or image.
Further, the 3rd relay J 3 is also provided with reset button FA, and reset button FA disconnects for the 3rd normally opened contact J3-1 realizing the 3rd relay J 3.
Further, alarm components LD is light emitting diode, and the positive pole of light emitting diode is connected with the positive pole (+) of voltage source U, and negative pole is connected with the negative pole (-) of voltage source U with the 3rd normally opened contact J3-1 by the 3rd relay J 3.
Further, the output voltage of voltage source is the alternating voltage of 220V or the DC voltage of 12V.
The principle of work of the current-voltage transformer secondary neutral ground current collecting device in the embodiment of the present invention is:
Current inductor M in device is connected with switch place ground wire K, when current inductor M senses that the real-time current of switch place ground wire K is greater than the threshold value that the first relay J 1 is preset, automatically the first normally opened contact J1-1 in closed first relay J 1, and the second normally opened contact J2-1 controlled successively in the second relay J 2 closes and the 3rd normally opened contact J3-1 in the 3rd relay J 3 closes, second branch road and voltage source U are conducted, realize alarm components LD alarm, as lumination of light emitting diode, thus the electric current in switch place can be gathered in time, effective judgement current-voltage transformer secondary earth fault, reach and notify and eliminate safe hidden trouble in time, guarantee the object of power network safety operation.
Implement the embodiment of the present invention, there is following beneficial effect:
In embodiments of the present invention, because device is by the loop current of current inductor inductive switch place ground wire, and this loop current is when being greater than default threshold value, control closed first relay, the second relay and the 3rd relay, realize alarm components alarm (as lumination of light emitting diode), thus the electric current in switch place can be gathered in time, effective judgement current-voltage transformer secondary earth fault, reach and notify and eliminate safe hidden trouble in time, guarantee the object of power network safety operation.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (6)
1. a current-voltage transformer secondary neutral ground current collecting device, it matches with switch place ground wire, it is characterized in that, described device comprises the first branch road and the second branch road that are in parallel, and is in series into the voltage source in loop with the first branch road after described parallel connection and the second branch road; Wherein,
Described first branch road comprises current inductor, the first relay and the second relay; Wherein, one end of described current inductor is connected with described switch place ground wire, and the other end is connected with the coil control end of described first relay, for responding to the real-time current of described switch place ground wire and generating current signal; Described first relay comprises the first normally opened contact, one end of described first normally opened contact is connected with one end of described voltage source, the other end is connected with the other end of described voltage source after being connected with the coil control end of described second relay, during for being greater than its default threshold value at the electric current getting the induction of described current inductor, its first normally opened contact closed, realizes described first branch road and described voltage source is conducted; Described second relay comprises the second normally opened contact, one end of described second normally opened contact is connected with the other end of described voltage source, the other end is connected with described second branch road, for when the first normally opened contact of described first relay closes, and closed described second normally opened contact;
Described second branch road comprises the 3rd relay and alarm components; Wherein, the coil control end of described 3rd relay is connected with the other end of the second normally opened contact of described second relay, and described 3rd relay also comprises the 3rd normally opened contact, one end of described 3rd normally opened contact is connected by described alarm components one end with described voltage source, the other end is connected with the other end of described voltage source, for when the second normally opened contact of described second relay closes, closed described 3rd normally opened contact, realizes described second branch road and described voltage source is conducted; Described alarm components is arranged between the 3rd normally opened contact of described voltage source and described 3rd relay, for when described second branch road and described voltage source are conducted, and outputting alarm signal.
2. device as claimed in claim 1, it is characterized in that, described second relay also comprises the 4th normally opened contact, and described four normally opened contacts are connected with external signal analytical equipment, for exporting described current signal to described external signal analytical equipment.
3. device as claimed in claim 2, it is characterized in that, described device also comprises display device, described display device is arranged between the coil control end of described current inductor and described first relay, the electric current that described display device is sensed for being shown described current inductor by the mode of figure or image.
4. device as claimed in claim 3, it is characterized in that, described 3rd relay is also provided with reset button, and described reset button disconnects for the 3rd normally opened contact realizing described 3rd relay.
5. device as claimed in claim 4, it is characterized in that, described alarm components is light emitting diode, and the positive pole of described light emitting diode is connected with the positive pole of described voltage source, and negative pole is connected with the negative pole of described voltage source with the 3rd normally opened contact by described 3rd relay.
6. device as claimed in claim 5, it is characterized in that, the output voltage of described voltage source is the alternating voltage of 220V or the DC voltage of 12V.
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| CN201510619255.0A CN105182046A (en) | 2015-09-25 | 2015-09-25 | Current voltage transformer secondary neutral grounding current acquisition device |
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| CN201510619255.0A CN105182046A (en) | 2015-09-25 | 2015-09-25 | Current voltage transformer secondary neutral grounding current acquisition device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106291218A (en) * | 2016-09-26 | 2017-01-04 | 深圳供电局有限公司 | A kind of protection analog acquisition loop Hidden fault analytical equipment |
| CN109991533A (en) * | 2019-03-11 | 2019-07-09 | 国网新疆电力有限公司昌吉供电公司 | Counter type control loop exports monitoring device |
| 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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Cited By (3)
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| CN106291218A (en) * | 2016-09-26 | 2017-01-04 | 深圳供电局有限公司 | A kind of protection analog acquisition loop Hidden fault analytical equipment |
| CN109991533A (en) * | 2019-03-11 | 2019-07-09 | 国网新疆电力有限公司昌吉供电公司 | Counter type control loop exports monitoring device |
| 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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