CN103575970A - Transformer grounding current monitoring device and system - Google Patents
Transformer grounding current monitoring device and system Download PDFInfo
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- CN103575970A CN103575970A CN201310567105.0A CN201310567105A CN103575970A CN 103575970 A CN103575970 A CN 103575970A CN 201310567105 A CN201310567105 A CN 201310567105A CN 103575970 A CN103575970 A CN 103575970A
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Abstract
The invention discloses a transformer grounding current monitoring device and system. The transformer grounding current monitoring device comprises a metal shell, an annular core and an ammeter connected to a secondary side of the annular core, wherein the annular core and the ammeter are arranged in the metal shell, one end of a primary side of the annular core is connected with a grounding down conductor of a transformer, the other end of the primary side of the annular core is connected with a corresponding grounding point of the transformer, and the number of turns of a coil on the secondary side of the annular core is smaller than that of a coil on the primary side of the annular core. According to the transformer grounding current monitoring device, it is ensured that electrical connection is good; due to the fact that metal shielding is adopted in the metal shell, it is ensured that leakage flux does not penetrate, the measuring error is reduced, and accuracy of measurement is ensured.
Description
Technical field
The present invention relates to field transformer, relate in particular to a kind of transformer grounding current monitoring device and system.
Background technology
Transformer core or the test of apparatus for fixing transformer ground current, be the important component part of transformer monitoring, by the ground current to transformer core/folder, tests, and can effectively find the appearance of multipoint earthing of iron core fault.
The method of carrying out at present the test of transformer core/clamp earthing current is that staff carries high precision clamp on amperemeter (hard jaw) and tests off-line type.The precision of clamp on amperemeter is no problem, but window too conference cause very large measuring error.And the difference of reometer jaw position, measured current values differs greatly, and analyzing its reason one is after jaw is opened, not close to close to put in place, and clamp on amperemeter iron core does not work, the 2nd, the leakage flux of transformer has been passed through the pincerlike window of reometer, makes measurement data distortion.
At present clamp on amperemeter is improved, transform hard jaw as soft jaw, and coordinate with common multimeter, although be very easy to the favourable of test, carry out, jaw can not easily regulate, and leakage flux still causes sizable measuring error.
Summary of the invention
The object of the present invention is to provide a kind of transformer grounding current monitoring device and system.
Based on above-mentioned purpose, the embodiment of the present invention provides a kind of transformer grounding current monitoring device, and this device comprises:
Metal shell, annular core and be connected to the reometer of annular core secondary side; Annular core and reometer are positioned at metal shell;
One end of the primary side of annular core is connected with the down conductor of transformer, and the other end is connected with the corresponding earth point of transformer;
The coil turn of annular core secondary side is less than the coil turn of primary side.
Preferably, down conductor is iron core grounding downlead or folder down conductor, and corresponding earth point is iron core grounding point or folder earth point.
Preferably, device also comprises the adjustable resistor of connecting with reometer.
Preferably, device also comprises:
A/D converter, for being converted to digital signal by the simulating signal on the adjustable resistor of sampling;
Microprocessor, for being sent to long distance control system by digital signal by CAN bus, so that long distance control system is monitored according to digital signal.
Preferably, the control command that microprocessor also sends for receiving remote supervisory system, and according to control command, transformer is controlled.
Preferably, half of the coil turn that the coil turn of annular core secondary side is primary side.
The present invention also provides a kind of transformer grounding current monitoring system, this system comprises at least two above-mentioned monitoring devices, wherein one end of the primary side of the annular core of at least one monitoring device is connected with the iron core grounding downlead of transformer, and the other end is connected with the iron core grounding point of transformer; One end of the primary side of the annular core of other monitoring device is connected with the folder down conductor of transformer, and the other end is connected with the folder earth point of transformer.
Preferably, each monitoring device also comprises:
The adjustable resistor of connecting with reometer.
A/D converter, for being converted to digital signal by the simulating signal on the adjustable resistor of sampling;
Microprocessor, for being sent to long distance control system by digital signal by CAN bus, so that long distance control system is monitored according to digital signal.
Preferably, half of the coil turn that the coil turn of annular core secondary side is primary side.
the invention has the beneficial effects as follows:
The present invention is by connecting respectively down conductor and earth point by the two ends of monitoring device annular core primary side, guaranteed that electrical connection is good, the iron core or the folder that guarantee transformer are clamped down in earth potential, and shell takes metallic shield, guarantee that leakage flux do not pass through.Transformer core or folder electric current are introduced annular core, and on annular core, the secondary coil number of turn is less than the primary winding number of turn, can realize core current measurement by magnification.Above-mentioned measure has reduced measuring error, has guaranteed the accuracy of measuring.
Further, the data of measurement are sent to supervisory system by CAN bus, have realized the situation of on-line monitoring remote monitoring monitoring.
Accompanying drawing explanation
Fig. 1 is the structural drawing with the transformer of bolt;
Fig. 2 is the transformer grounding current monitoring device structural drawing of embodiment mono-;
Fig. 3 is another transformer grounding current monitoring device structural drawing of embodiment mono-.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention one has been recorded a kind of transformer grounding current monitoring device, and as shown in Figure 2, this device 23 is for monitoring the iron core of transformer 21 or the ground current of folder.This device 23 specifically comprises:
One end of the primary side of annular core 232 is connected with the down conductor 22 of transformer 21, and the other end is connected with the corresponding earth point 24 of transformer 21.The coil turn of annular core 232 secondary sides is less than the coil turn of primary side.
Existing transformer, the down conductor of its iron core or folder is generally by bolt ground connection.As shown in Figure 1, between the down conductor 12 of its transformer 11 and earth point 14, by bolt 13, be connected.When monitoring device will be monitored the ground current of transformer, can unclamp bolt 13, then the two ends of monitoring device annular core primary side are connected with earth point 14 with down conductor 12 respectively.
For realizing more accurately, measure, the coil turn that annular core primary side is set is greater than the coil turn of secondary side, so that electric current measurement by magnification.Coil turn that can annular core secondary side in the present invention is set to half of coil turn of primary side.
For regulating the size of electric current, to avoid exceeding the range etc. of reometer, can be at an adjustable resistance of secondary side series connection of annular core.As shown in Figure 2, adjustable resistance 234 is connected on to the secondary side of annular core 232 together with reometer 233.
Be further the ground current of remote monitoring transformer, can send the ground current value monitoring to long distance control system.
Fig. 3 is the ground current of monitoring device 33 on-line monitoring transformers 31 schematic diagram that the ground current monitoring is sent to long distance control system 37.
One end of the primary side of annular core 332 is connected with the down conductor 32 of transformer 31, and the other end is connected with the corresponding earth point 34 of transformer 31.A/D converter 35 is for being converted to digital signal by the simulating signal on institute's adjustable resistor of sampling; Microprocessor 36 is for digital signal is sent to long distance control system 37 by CAN bus, so that long distance control system 37 is monitored according to digital signal.
In this long distance control system 37, go back capable of dynamic and show the curve of electric current and dependent thresholds is set, point out and report to the police.
In addition, the control command that microprocessor 36 also sends for receiving remote supervisory system 37, and according to control command, transformer 31 is controlled.
The embodiment of the present invention two also provides a kind of transformer grounding current monitoring system, this system comprises at least two monitoring devices as described in embodiment mono-, wherein a part of monitoring device is for monitoring the ground current of transformer core, and another part monitoring device is for monitoring the ground current of apparatus for fixing transformer.The one end of primary side and the iron core grounding downlead of transformer that are the annular core of at least one monitoring device are connected, and the other end is connected with the iron core grounding point of transformer; One end of the primary side of the annular core of other monitoring device is connected with the folder down conductor of transformer, and the other end is connected with the folder earth point of transformer.
Above-mentioned each monitoring device also comprises adjustable resistance, A/D converter and microprocessor.A/D converter is for being converted to digital signal by the simulating signal on the adjustable resistor of sampling; Microprocessor, for being sent to long distance control system by digital signal by CAN bus.Long distance control system just can receive the related data of same transformer iron core grounding current and clamp earthing current like this, and same transformer iron core grounding current and clamp earthing current are carried out to lateral comparison.
It should be noted that, apparatus and method embodiment of the present invention is corresponding, relevant portion reference mutually.
Above specific embodiment, object of the present invention, technical scheme and beneficial effect are further described, institute it should be noted, these are only a specific embodiment of the present invention, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (9)
1. a transformer grounding current monitoring device, is characterized in that, described device comprises:
Metal shell, annular core and be connected to the reometer of described annular core secondary side; Described annular core and described reometer are positioned at described metal shell;
One end of the primary side of described annular core is connected with the down conductor of described transformer, and the other end is connected with the corresponding earth point of described transformer;
The coil turn of described annular core secondary side is less than the coil turn of primary side.
2. monitoring device as claimed in claim 1, is characterized in that, the down conductor of described transformer is iron core grounding downlead or folder down conductor, and the corresponding earth point of described transformer is iron core grounding point or folder earth point.
3. monitoring device as claimed in claim 1, is characterized in that, described device also comprises the adjustable resistor of connecting with described reometer.
4. monitoring device as claimed in claim 3, is characterized in that, described device also comprises:
A/D converter, for being converted to digital signal by the simulating signal on the described adjustable resistor of sampling;
Microprocessor, for described digital signal is sent to long distance control system by CAN bus, so that described long distance control system is monitored according to described digital signal.
5. monitoring device as claimed in claim 4, is characterized in that, the control command that described microprocessor also sends for receiving described long distance control system, and according to described control command, described transformer is controlled.
6. the monitoring device as described in any one in claim 1-5, is characterized in that, half of the coil turn that the coil turn of described annular core secondary side is primary side.
7. a transformer grounding current monitoring system, it is characterized in that, described system comprises at least two monitoring devices as claimed in claim 1, wherein one end of the primary side of the annular core of the monitoring device described at least one is connected with the iron core grounding downlead of transformer, and the other end is connected with the iron core grounding point of described transformer; One end of the primary side of the annular core of other monitoring device is connected with the folder down conductor of described transformer, and the other end is connected with the folder earth point of described transformer.
8. monitoring system as claimed in claim 7, is characterized in that, the monitoring device described in each also comprises:
The adjustable resistor of connecting with described reometer;
A/D converter, for being converted to digital signal by the simulating signal on the described adjustable resistor of sampling;
Microprocessor, for described digital signal is sent to long distance control system by CAN bus, so that described long distance control system is monitored according to described digital signal.
9. monitoring system as claimed in claim 7 or 8, is characterized in that half of the coil turn that the coil turn of described annular core secondary side is primary side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310567105.0A CN103575970A (en) | 2013-11-14 | 2013-11-14 | Transformer grounding current monitoring device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310567105.0A CN103575970A (en) | 2013-11-14 | 2013-11-14 | Transformer grounding current monitoring device and system |
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| CN103575970A true CN103575970A (en) | 2014-02-12 |
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| CN201310567105.0A Pending CN103575970A (en) | 2013-11-14 | 2013-11-14 | Transformer grounding current monitoring device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182153A (en) * | 2015-08-24 | 2015-12-23 | 国网天津静海供电有限公司 | Grounding wire fault indicator for distribution transformer |
| CN110632376A (en) * | 2019-09-27 | 2019-12-31 | 上海锐开电气有限公司 | Iron core and folder ground current monitoring devices based on transformer copper bar ground connection |
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| CN110632376A (en) * | 2019-09-27 | 2019-12-31 | 上海锐开电气有限公司 | Iron core and folder ground current monitoring devices based on transformer copper bar ground connection |
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Application publication date: 20140212 |