CN202815065U - Induction heater earth current on-line detecting device - Google Patents
Induction heater earth current on-line detecting device Download PDFInfo
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- CN202815065U CN202815065U CN 201220517704 CN201220517704U CN202815065U CN 202815065 U CN202815065 U CN 202815065U CN 201220517704 CN201220517704 CN 201220517704 CN 201220517704 U CN201220517704 U CN 201220517704U CN 202815065 U CN202815065 U CN 202815065U
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Abstract
The utility model relates to an induction heater earth current on-line detecting device. The on-line detecting device comprises a current signal acquiring circuit and a data processing and controlling unit connected on the output end of the current signal acquiring circuit. The current signal acquiring circuit comprises a current transformer, a resistor connected on the output end of the current transformer in a parallel way, a first isolation resistor and a second isolation resistor respectively connected on the two ends of the resistor, and serially connected sampling resistors. After being serially connected, the two sampling resistors have the two ends respectively connected with the rear ends of the first isolation resistor and the second isolation resistor. The common end of the two sampling resistors is connected to a reference voltage end of the data processing and controlling unit. The rear ends of the first isolation resistor and the second isolation resistor are respectively connected with the acquisition signal input end of the data processing and controlling unit. The on-line detecting device has the characteristics of simple structure, high precision, safety and reliability. Acquired current signals can be not only displayed on site but also transmitted to a background server. Operators are then enabled to perform comprehensive direct-viewing and real-time monitoring on the insulation states and running conditions of transformers, reactor iron cores and cabinets in a remote way.
Description
Technical field
The utility model relates to a kind of induction heating apparatus ground current on-line measuring device.
Background technology
Induction heating is to utilize electromagnetic induction phenomenon that electric energy conversion is heat energy, is usually used in the heat treated field of metal parts.Put a coil in the metallic conductor outside.When exchange current passes into induction coil, will produce alternating flux in the induction coil, make the workpiece in the induction coil be subject to electromagnetic induction and produce induced potential.Induced potential produces induction current in workpiece makes inside workpiece begin heating, the ultimate principle of Here it is induction heating.The induction heating apparatus working current is large, and the size of power consumption also directly affected production safety when whether its ground connection reliably not only affected work.Existing induction heating apparatus checking for grounded current apparatus structure is complicated, and low precision, poor reliability can not telecommunications, can't realize online detection.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, induction heating apparatus ground current on-line measuring device that precision is high, safe and reliable.
The utility model is that the technical scheme that the technical solution problem adopts is:
A kind of induction heating apparatus ground current on-line measuring device described in the utility model, comprise the current signal Acquisition Circuit, be connected to the data processing and control element (PCE) of current signal Acquisition Circuit output terminal, it is characterized in that: described current signal Acquisition Circuit comprises current transformer, be connected in parallel on the resistance of current transformer output terminal, be connected to the first isolation resistance and second isolation resistance at resistance two ends, the sampling resistor of series connection, two ends are connected to the rear end of the first isolation resistance and the second isolation resistance after the series connection of two sampling resistors, the common port of two sampling resistors is connected to the reference voltage terminal of data processing and control element (PCE), and the rear end of the first isolation resistance and the second isolation resistance is the collection signal input end of connection data processing and control element (PCE) respectively.
Two ends are connected to the rear end of the first isolation resistance and the second isolation resistance, the common end grounding of two filter capacitors after the series connection of two filter capacitors.
Output terminal connecting communication unit at the data processing and control element (PCE).
After adopting technique scheme, this induction heating apparatus ground current on-line measuring device is simple in structure, precision is high, safe and reliable, the current signal that gathers both can show at the scene, also can teletransmission to background server, realize that the long-range realization of operating personnel carries out comprehensive, directly perceived and real-time monitoring to state of insulation and the operation conditions of transformer, core of reactor and rack.
Description of drawings
Fig. 1 is the electrical schematic diagram of the current signal Acquisition Circuit of an embodiment of the utility model.
Fig. 2 is the functional-block diagram of an embodiment of the utility model.
Embodiment
As shown in Figure 2, a kind of induction heating apparatus ground current on-line measuring device described in the utility model is comprised of current signal Acquisition Circuit 6, data processing and control element (PCE) 4, display unit 2, acousto-optic warning unit 5, communication unit 3 and system server 1.Data processing and control element (PCE) 4 is connected to the output terminal of current signal Acquisition Circuit 6.Output terminal connecting communication unit 3 and acousto-optic warning unit 5 at data processing and control element (PCE) 4.The output terminal of communication unit 3 connects display unit 2 and system server 1.The input end of current signal Acquisition Circuit 6 is connected to the Transformer Core Grounding row 7 of induction heating apparatus or the position that iron core of electric reactor earthing bar 8 or rack earthing bar 9 etc. need to detect ground current.
As shown in Figure 1, described current signal Acquisition Circuit comprises current transformer T, be connected in parallel on the resistance R 1 of current transformer T output terminal, be connected to the first isolation resistance R4 and the second isolation resistance R5 at resistance R 1 two ends, the sampling resistor R2 of series connection, R3, two sampling resistor R2, two ends are connected to the rear end of the first isolation resistance R4 and the second isolation resistance R5 after the R3 series connection, two sampling resistor R2, the common port REFOUT of R3 is connected to the reference voltage terminal of data processing and control element (PCE), the rear end VP of the first isolation resistance R4 and the second isolation resistance R5, VN is the collection signal input end of connection data processing and control element (PCE) respectively.
Two ends are connected to the rear end of the first isolation resistance R4 and the second isolation resistance R5, the common end grounding of two filter capacitor C1, C2 after two filter capacitor C1, the C2 series connection.
During the normal ground connection of induction heating apparatus, because the no current loop forms.Electric current is very little on the ground wire, is generally a milliampere level.When there are multipoint earthing in transformer or iron core of electric reactor, be equivalent to have the short circuit circle to exist around the iron core main flux, the circulation that flows through in the circle, its value is decided by the relative position of trouble spot and normal earth point, and magnetic flux what namely surround in the short circuit circle.Generally can reach several amperes.During the rack electric leakage, there is larger electric current in the rack ground wire.Whether utilizing to measure in the ground lead has no current, can judge very accurately iron core and have or not multipoint earth faults or rack to leak electricity.Concrete trouble spot can be distinguished according to the difference of the measurement point that breaks down.
The current signal Acquisition Circuit is selected the parallel resistance of current transformer and 100 Ω of 1A/1mA, makes current sampling signal about 0.1V.Vp, the vn pin of special-purpose chip in the current signal Acquisition Circuit output termination data processing and control element (PCE) 4, if also have other mutual inductor then corresponding pin becomes v2p, v2n, connect v2p, the v2n pin of chip, the common port REFOUT of sampling resistor R2, R3 connects the refout pin of chip, can be public, a chip can connect at most three mutual inductors.If need more mutual inductor, then need increase the quantity of chip.In the actual motion, by the size of monitoring sampled voltage, electric current, and the voltage amplification factor of change special chip makes it be operated in best metering state.Need to measure the leakage current at several places, several current collection circuits then are installed.
Above-mentioned data processing and control element (PCE) 4, display unit 2, acousto-optic warning unit 5, communication unit 3, system server 1 all existing multiple prior art can supply to use for reference, and can realize its inherent function, narrate no longer one by one at this.
Claims (3)
1. induction heating apparatus ground current on-line measuring device, comprise the current signal Acquisition Circuit, be connected to the data processing and control element (PCE) of current signal Acquisition Circuit output terminal, it is characterized in that: described current signal Acquisition Circuit comprises current transformer (T), be connected in parallel on the resistance (R1) of current transformer (T) output terminal, be connected to the first isolation resistance (R4) and second isolation resistance (R5) at resistance (R1) two ends, sampling resistor (the R2 of series connection, R3), two sampling resistor (R2, R3) the later two ends of series connection are connected to the rear end of the first isolation resistance (R4) and the second isolation resistance (R5), two sampling resistor (R2, R3) common port (REFOUT) is connected to the reference voltage terminal of data processing and control element (PCE), the rear end (VP of the first isolation resistance (R4) and the second isolation resistance (R5), VN) the collection signal input end of difference connection data processing and control element (PCE).
2. a kind of induction heating apparatus ground current on-line measuring device according to claim 1, it is characterized in that: two ends are connected to the rear end of the first isolation resistance (R4) and the second isolation resistance (R5), the common end grounding of two filter capacitors (C1, C2) after two filter capacitors (C1, the C2) series connection.
3. a kind of induction heating apparatus ground current on-line measuring device according to claim 1 and 2 is characterized in that: in the output terminal connecting communication unit of data processing and control element (PCE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517704 CN202815065U (en) | 2012-10-11 | 2012-10-11 | Induction heater earth current on-line detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517704 CN202815065U (en) | 2012-10-11 | 2012-10-11 | Induction heater earth current on-line detecting device |
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| Publication Number | Publication Date |
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| CN202815065U true CN202815065U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220517704 Expired - Fee Related CN202815065U (en) | 2012-10-11 | 2012-10-11 | Induction heater earth current on-line detecting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN103529280A (en) * | 2013-10-12 | 2014-01-22 | 河南开启电力实业有限公司 | Abnormal overvoltage on-line detection device |
| CN112525577A (en) * | 2020-11-23 | 2021-03-19 | 江西联创光电超导应用有限公司 | High-temperature superconducting induction heating transmission detection method, device and system |
| CN113280854A (en) * | 2021-04-02 | 2021-08-20 | 无锡先导智能装备股份有限公司 | Monitoring method and device for induction heating device, computer equipment and storage medium |
-
2012
- 2012-10-11 CN CN 201220517704 patent/CN202815065U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN103529280A (en) * | 2013-10-12 | 2014-01-22 | 河南开启电力实业有限公司 | Abnormal overvoltage on-line detection device |
| CN112525577A (en) * | 2020-11-23 | 2021-03-19 | 江西联创光电超导应用有限公司 | High-temperature superconducting induction heating transmission detection method, device and system |
| CN113280854A (en) * | 2021-04-02 | 2021-08-20 | 无锡先导智能装备股份有限公司 | Monitoring method and device for induction heating device, computer equipment and storage medium |
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| 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: 20130320 Termination date: 20151011 |
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| EXPY | Termination of patent right or utility model |