CN202676845U - Device for monitoring earth fault of transformer core - Google Patents
Device for monitoring earth fault of transformer core Download PDFInfo
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- CN202676845U CN202676845U CN 201220305489 CN201220305489U CN202676845U CN 202676845 U CN202676845 U CN 202676845U CN 201220305489 CN201220305489 CN 201220305489 CN 201220305489 U CN201220305489 U CN 201220305489U CN 202676845 U CN202676845 U CN 202676845U
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Abstract
The utility model provides a device for monitoring the earth fault of a transformer core, which comprises a current transformer, a shell, a display screen, and a measuring circuit arranged in the shell. The measuring circuit is connected with the current transformer and the display screen. The measuring circuit comprises a current/voltage conversion unit, an amplifying circuit, an A/D conversion unit, an operation control unit, an alarm unit, a display unit and a wireless transmission unit. The current transformer is clamped onto the grounding lead of a transformer core and is connected with the current/voltage conversion unit. The amplifying circuit is respectively connected with the A/D conversion unit and the current/voltage conversion unit. The operation control unit is respectively connected with the A/D conversion unit, the display unit, the alarm unit and the wireless transmission unit. The display screen of the display unit is arranged on the panel of the shell. The device has the advantages of simple structure, accurate measurement and safe usage.
Description
Technical field
The utility model belongs to the current/voltage monitoring technical field, specifically, has related to a kind of Treatment for Grounding Fault of Transformer Core monitoring device.
Background technology
The ground current that is in the iron core of the transformer in the running status is very little, approximately is several milliamperes to tens milliamperes, still, when transformer core generation multipoint earth faults, the ground current of iron core increases to rapidly several amperes even tens amperes, will cause the local iron core of transformer overheated, thereby can cause the decomposition of oil, produce inflammable gas, make ground wire fusing, burn out iron core, cause the iron core electric potential floating, cause discharge, finally cause the transformer body fault.The common method of monitoring multipoint earthing of iron core of transformer fault is at present: 1, directly survey iron core insulation resistance over the ground under transformer temporary interruption state, but, the power failure detection of transformer can have a strong impact on final user's life, activity in production, in order to guarantee power supply reliability, adopt the mode of temporary interruption not meet the aim that the quality supply service is provided.2, the field staff adopts clamp on amperemeter to monitor its electric current, is to make a response to fault immediately with the disadvantage of the monitoring mode of clamp on amperemeter measuring transformer ground wire electric current, has the hidden trouble that accident is further enlarged; And because the interference of transformer high-intensity magnetic field, measured value is out of true very, even the several times totally different situation of measured value difference of same measurement point occurs.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thus provide a kind of simple in structure, be swift in response, measure accurate, easy and simple to handle, use the strong Treatment for Grounding Fault of Transformer Core monitoring device of safe, practical property.
To achieve these goals, the technical scheme that the utility model adopts is: a kind of Treatment for Grounding Fault of Transformer Core monitoring device, it comprises current transformer, housing, display screen and is arranged on the metering circuit of described enclosure interior, and described metering circuit connects respectively described current transformer and described display screen; Described metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit; Described current transformer pincers are stuck on the ground lead of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of described current transformer connects described current/voltage-converted unit is converted to voltage signal with the ground current signal of the transformer core that will gather; The output terminal of described current/voltage-converted unit connects the input end of described amplifying circuit with amplification voltage signal; The output terminal of described amplifying circuit connects the input end of described A/D converting unit so that analog voltage signal is converted to digital voltage signal; The output terminal that described Operations Analysis connects described A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends corresponding control signal; The display screen of described display unit is arranged on the panel of described housing, and described display unit connects described Operations Analysis to show effective transformer iron core grounding current value; Described alarm unit connects described Operations Analysis to send alerting signal; Described Operations Analysis connects described wireless transmission unit so that efficient pressure swing device iron core grounding current value is sent to long distance control system by cordless communication network.
Based on above-mentioned, described current transformer is that precision is 1% split core type current transformer; The model of the current/voltage conversion chip of described current/voltage-converted unit is MAX4072; Described amplifying circuit is the operational amplification circuit of amplification voltage signal.
Based on above-mentioned, the model of the A/D conversion chip in the described A/D converting unit is ADS8557.
The relative prior art of the utility model has substantive distinguishing features and progress; specifically; the utlity model has following characteristics: 1, this monitoring device has been realized the purpose of the real-time demonstration of transformer iron core grounding current by simple circuit combination; make the monitor staff can grasp at any time the duty of transformer; avoid the shutdown of transformer to detect, saved human and material resources.2, this monitoring device uses split core type current transformer, directly these current transformer pincers is stuck on the ground lead of transformer core, and is convenient and simple.3, this monitoring device connects long distance control system by the wireless transmission unit, the display device that efficient pressure swing device iron core grounding current value is sent to long distance control system shows in real time, make the monitor staff not need to carry out data acquisition to the scene, just can obtain intuitively the reading of transformer iron core grounding current at Central Control Room.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structured flowchart of metering circuit.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, a kind of Treatment for Grounding Fault of Transformer Core monitoring device, it comprises current transformer 1, housing 2, display screen 3 and is arranged on the metering circuit of described housing 2 inside, and described metering circuit connects respectively described current transformer 1 and described display screen 3.
As shown in Figure 2, described metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit, and described current transformer 1 pincers are stuck on the ground lead 4 of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of described current transformer connects described current/voltage-converted unit is converted to voltage signal with the ground current signal of the transformer core that will gather; The output terminal of described current/voltage-converted unit connects the input end of described amplifying circuit with amplification voltage signal; The output terminal of described amplifying circuit connects the input end of described A/D converting unit so that analog voltage signal is converted to digital voltage signal; The output terminal that described Operations Analysis connects described A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends corresponding control signal; The display screen 3 of described display unit is arranged on the panel of described housing 2, and described display unit connects described Operations Analysis to show effective transformer iron core grounding current value; Described alarm unit connects described Operations Analysis to send alerting signal, immediately notifies field service personnel to carry out accident and gets rid of processing.
Described current transformer adopts, and to be that precision is 1%, measurements range of current is 0-20A, be fit to pincers be stuck in the split core type current transformer that transformer core grounding goes between; The model of the current/voltage conversion chip of described current/voltage-converted unit is MAX4072; Described amplifying circuit is the operational amplification circuit of amplification voltage signal; The model of the A/D conversion chip in the described A/D converting unit is ADS8557.
Described Operations Analysis connects described wireless transmission unit, efficient pressure swing device iron core grounding current value is sent to long distance control system by cordless communication network, thereby the display device in long distance control system shows, make the operating personnel of long distance control system Central Control Room can obtain intuitively the effective value of transformer iron core grounding current, thereby be beneficial to operating personnel to the grasp of the present duty of transformer.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (3)
1. Treatment for Grounding Fault of Transformer Core monitoring device, comprise current transformer, housing, display screen and be arranged on the metering circuit of described enclosure interior, described metering circuit connects respectively described current transformer and described display screen, it is characterized in that: described metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit; Described current transformer pincers are stuck on the ground lead of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of described current transformer connects described current/voltage-converted unit is converted to voltage signal with the ground current signal of the transformer core that will gather; The output terminal of described current/voltage-converted unit connects the input end of described amplifying circuit with amplification voltage signal; The output terminal of described amplifying circuit connects the input end of described A/D converting unit so that analog voltage signal is converted to digital voltage signal; The output terminal that described Operations Analysis connects described A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends corresponding control signal; The display screen of described display unit is arranged on the panel of described housing, and described display unit connects described Operations Analysis to show effective transformer iron core grounding current value; Described alarm unit connects described Operations Analysis to send alerting signal; Described Operations Analysis connects described wireless transmission unit so that efficient pressure swing device iron core grounding current value is sent to long distance control system by cordless communication network.
2. Treatment for Grounding Fault of Transformer Core monitoring device according to claim 1, it is characterized in that: described current transformer is that precision is 1% split core type current transformer; The model of the current/voltage conversion chip of described current/voltage-converted unit is MAX4072; Described amplifying circuit is the operational amplification circuit of amplification voltage signal.
3. Treatment for Grounding Fault of Transformer Core monitoring device according to claim 1, it is characterized in that: the model of the A/D conversion chip in the described A/D converting unit is ADS8557.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305489 CN202676845U (en) | 2012-06-28 | 2012-06-28 | Device for monitoring earth fault of transformer core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305489 CN202676845U (en) | 2012-06-28 | 2012-06-28 | Device for monitoring earth fault of transformer core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676845U true CN202676845U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220305489 Expired - Fee Related CN202676845U (en) | 2012-06-28 | 2012-06-28 | Device for monitoring earth fault of transformer core |
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| Country | Link |
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| CN (1) | CN202676845U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759681A (en) * | 2012-06-28 | 2012-10-31 | 河南省电力公司信阳供电公司 | Transformer core ground fault monitoring device |
| CN104849540A (en) * | 2015-05-07 | 2015-08-19 | 国家电网公司 | Power transmission and transformation startup debugging micro current measuring pliers |
| CN105717349A (en) * | 2014-12-02 | 2016-06-29 | 国家电网公司 | Grounding current on-line monitoring device and grounding current on-line monitoring method |
-
2012
- 2012-06-28 CN CN 201220305489 patent/CN202676845U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759681A (en) * | 2012-06-28 | 2012-10-31 | 河南省电力公司信阳供电公司 | Transformer core ground fault monitoring device |
| CN105717349A (en) * | 2014-12-02 | 2016-06-29 | 国家电网公司 | Grounding current on-line monitoring device and grounding current on-line monitoring method |
| CN104849540A (en) * | 2015-05-07 | 2015-08-19 | 国家电网公司 | Power transmission and transformation startup debugging micro current measuring pliers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20140628 |
|
| EXPY | Termination of patent right or utility model |