CN2938123Y - Electric network insulation impedance detection device - Google Patents
Electric network insulation impedance detection device Download PDFInfo
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- CN2938123Y CN2938123Y CN 200620079614 CN200620079614U CN2938123Y CN 2938123 Y CN2938123 Y CN 2938123Y CN 200620079614 CN200620079614 CN 200620079614 CN 200620079614 U CN200620079614 U CN 200620079614U CN 2938123 Y CN2938123 Y CN 2938123Y
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Abstract
Disclosed is a power grid insulation impedance detection device, comprising a DSP application system which controls the whole machine, a zero sequence current input circuit whose output terminal is connected to the DSP application system, a zero sequence voltage input circuit whose output terminal is connected to the DSP application system, a keyboard input circuit output terminal is connected to the DSP application system, a serial communication circuit which is linked with the DSP application system, a display circuit whose input terminal is connected to the DSP application system. The utility model detects the insulation parameters of the ground resistance during the extra single phase. Compared with the current power grid impedance resistance and impedance detection device, the utility model has the advantages of reasonable design, simple structure, good security, wide practice and accurate detection result. The utility model provides a reliable basis for the application of the power grid safety technology such as creepage protection, grounding protection and power grid tuning technology; the utility model can be popularized and applied in up or down the pit power grid detection.
Description
Technical field
The utility model belongs to the device technique field of measuring resistance, reactance, impedance or other characteristic derived, and the real-valued or complex value that is specifically related to other two-pole characteristics of resistance, reactance or its derivation of being measured by the element of another power delivery electric current or network impedance is measured.
Background technology
Insulation against ground resistance and distributed capacitance over the ground are two parts of insulation impedance of electrical network, relate to the important parameter of electric power netting safe running.The insulation impedance of electrical network has determined electric network active leakage current and capacitance current to a great extent, is the principal element that influences electrical network person shock current, single-phase-to-ground current size, is earth leakage protection, and ground protection, device such as tuning are provided with the foundation of research.In the resonant earthed system of arc suppression coil was arranged, the accurate measurement of capacitance current was the key problem that arc suppression coil is rationally regulated.When operation of power networks, insulation resistance and ground capacitance are subjected to the influence of extraneous factor and constantly change, and must often measure.
In document and reality, should be mentioned that the measuring method of capacitance current more, as single-phase direct metal earthing, neutral point impressed voltage method, neutral point add capacitance method, relatively additional capacitor method, tuning method, the real-time mensuration of unbalance voltage, inject signalling.In fact, capacitance current is the action effect form of ground capacitance when operation of power networks, can further calculate ground capacitance by the capacitance current that measures.As seen, various measuring methods to capacitance current come down to measure the method for ground capacitance.
In various measuring methods, except that single-phase direct metal earthing, other measuring method has all been ignored the influence of insulation against ground resistance, comes close approximation capacitance current or ground capacitance with the total current or all insulation impedance of system.In other words, can not distinguish insulation resistance and ground capacitance, the minimum fashion of this influence at insulation resistance can, but the insulation resistance of real system can not ignore fully, makes the measurement of insulation parameter produce error thus.In addition, existing measuring method add ons in computation process is all participated in computing, adds the nominal value of element and the degree of accuracy that the actual value error directly influences the line insulation parameter of trying to achieve.Use the wider capacitance method that adds, when adding electric capacity outside, the effect that discharges and recharges owing to electric capacity is equivalent to produce a metallic earthing fault in the moment of artificial ground in electrical network, and this obviously is unfavorable for safety; Also need to adopt the timely discharge capacity energy storage of proper method when withdrawing from.Single-phase direct metal earthing is more directly perceived, can measure the insulation resistance and the ground capacitance of electrical network, can distinguish the real component and the idle component of residual flow, but metallic earthing has certain danger.Also have, existing various measuring methods are applicable to certain specific neutral point operational system respectively, and versatility is poor.
The technical matters that current production unit and electric system press for solution provides the measurement mechanism of a kind of electrical network insulation against ground resistance and ground capacitance.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the shortcoming of the measurement dress of above-mentioned electrical network insulation against ground resistance and ground capacitance, provide a kind of reasonable in design, simple in structure, security is good, institute's data of surveying are accurate, be applicable to the line insulation impedance detection device that can distinguish detection insulation against ground resistance and ground capacitance simultaneously of isolated neutral system, resonant earthed system, neutral point resistance grounded.
Solving the problems of the technologies described above the technical scheme that is adopted is that it comprises: the DSP application system that complete machine is controlled; The zero-sequence current input circuit, the output termination DSP application system of this circuit; The residual voltage input circuit, the output termination DSP application system of this circuit; The keyboard input circuit, the output termination DSP application system of this circuit; Serial communication circuit, this circuit is connected in the DSP application system; It also comprises display circuit, the input termination DSP application system of this circuit.
Zero-sequence current input circuit of the present utility model is: the zero sequence current signal of input passes through R12, R11 is from the inverting input input of integrated circuit U2B, the in-phase input end of integrated circuit U2B is by R9 ground connection, inverting input connects the 2.5V positive source and connects output terminal by R8 by R10, output terminal connects the inverting input of integrated circuit U2A and connects inverting input by R8 by R7, the end of the termination R12 of R13, other end ground connection, the other end of the termination R12 of C6, other end ground connection, the in-phase input end of integrated circuit U2A is by R6 ground connection, inverting input connects output terminal by R5, output terminal connects the DSP application system by R4,4 pin connect the 3.3V positive source, 11 pin connect the 3.3V power cathode.
Residual voltage input circuit of the present utility model is: the residual voltage signal of input is by R22, the R21 inverting input input from integrated circuit U2D, the in-phase input end of integrated circuit U2D connects the 2.5V positive source and connects output terminal, output terminal meet integrated circuit U2C by R17 inverting input by R18 by R20 by R19 ground connection, inverting input, between the termination R21 and R22 of C7, other end ground connection, the in-phase input end of integrated circuit U2C by R16 ground connection, inverting input by R15 connect output terminal, output terminal connects the DSP application system by R14.
The model of integrated circuit U2A of the present utility model and integrated circuit U2B is MCP604.
The model of integrated circuit U2C of the present utility model and integrated circuit U2D is MCP604.
The utility model has adopted attach list resistance measurement insulation parameter relatively; the utility model is compared with existing electric network impedance measuring resistance, reactance device; have reasonable in design, simple in structure, security is good, practicality is wide, advantage such as the data of surveying are accurate, for the enforcement of power grid security technology such as earth leakage protection, ground protection, electrical network is tuning provides reliable basis.Can in the detection of aboveground electrical network or underground electric network, promote the use of.
Description of drawings
Fig. 1 is an electrical principle block scheme of the present utility model.
Fig. 2 is an electronic circuit schematic diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described, but the utility model is not limited to these embodiment.
Fig. 1 is an electrical principle block scheme of the present utility model, referring to Fig. 1.In Fig. 1, the utility model is connected and composed by zero-sequence current input circuit, residual voltage input circuit, DSP application system, serial communication circuit, keyboard input circuit, display circuit.The output termination DSP application system of zero-sequence current input circuit and residual voltage input circuit and keyboard input circuit, the DSP application system is connected with serial communication circuit, the output termination display circuit of DSP application system.
In Fig. 2, the zero-sequence current input circuit of present embodiment is connected and composed by integrated circuit U2A, integrated circuit U2B, R4～R13, C6, and the model of integrated circuit U2A and integrated circuit U2B is MCP604.The zero current signal of input is by R12, the R11 inverting input input from integrated circuit U2B, the in-phase input end of integrated circuit U2B connects the 2.5V positive source and connects output terminal, output terminal meet integrated circuit U2A by R7 inverting input by R8 by R10 by R9 ground connection, inverting input, an end, the other end ground connection of the termination R12 of R13, the other end of the termination R12 of C6, other end ground connection, R13 and C6 constitute the wave filter of zero-sequence current input signal.The in-phase input end of integrated circuit U2A connects output terminal, output terminal by R6 ground connection, inverting input by R5 and connects by R4 that DSP application system, 4 pin connect the 3.3V positive source, 11 pin connect the 3.3V power cathode.
The residual voltage input circuit of present embodiment is connected and composed by integrated circuit U2C, integrated circuit U2D, R14～R22, C7, and the model of integrated circuit U2C and integrated circuit U2D is MCP604.The residual voltage signal of input is by R22, the R21 inverting input input from integrated circuit U2D, the in-phase input end of integrated circuit U2D connects the 2.5V positive source and connects output terminal, output terminal by R18 by R20 by R19 ground connection, inverting input and connects the inverting input of integrated circuit U2C by R17, between the termination R21 and R22 of C7, other end ground connection.The in-phase input end of integrated circuit U2C by R16 ground connection, inverting input by R15 connect output terminal, output terminal connects the DSP application system by R14.
The keyboard input circuit of present embodiment is connected and composed by button S2～button S17.The end of button S2, button S6, button S10, button S14 connects the 3.3V positive source by R26, the termination DSP application system of button S3, button S7, button S11, button S15 also connects the 3.3V positive source by R27, the termination DSP application system of button S4, button S8, button S12, button S16 also connects the 3.3V positive source by R28, the termination DSP application system of button S5, button S9, button S13, button S17 also connects the 3.3V positive source, another termination DSP application system of button S2～button S17 by R29.
The DSP application system of present embodiment is connected and composed by integrated circuit U1, R1～R3, C1～C5, button S1, oscillator CRY1, and the model of integrated circuit U1 is LF2407A.107 pin of integrated circuit U1 connect the output terminal of integrated circuit U2A by R4,109 pin connect the output terminal of integrated circuit U2C by R14,19 pin connect the other end of button S2～button S5,119 pin connect the other end of button S6～button S9,30 pin connect the other end of button S10～button S13,32 pin connect the other end of button S14～button S17,33 pin connect the 3.3V positive source by R26,35 pin connect the 3.3V positive source by R27,72 pin connect the 3.3V positive source by R28,70 pin connect the 3.3V positive source by R29,123 pin connect the oscillatory circuit that is connected with C5 and oscillator CRY1 by C4 with 124 pin, 10 pin connect the end of R3 and C3,11 pin connect the end of C2 and the other end of C3, the other end of another termination C2 of R3,133 pin connect the end of R1 and C1 and connect the 3.3V positive source by R2, the other end of the termination R1 of button S1, other end ground connection, the other end ground connection of C1.The power supply termination 3.3V positive source of integrated circuit U1, hold ground connection, 25 pin of integrated circuit U1 and 26 pin connect serial communication circuit, 81 pin output resistor switching signals, and 40 pin of integrated circuit U1,44 pin, 47 pin, 52 pin, 73 pin, 65 pin, 62 pin, 59 pin, 55 pin, 46 pin, 38 pin, 88 pin connect display circuit.
The present embodiment serial communication circuit is connected and composed by integrated circuit U3, diode D1, R23～R25, C8～C11, socket RS-1, and the model of integrated circuit U3 is MAX232CPE.9 pin of integrated circuit U3 connect 26 pin of integrated circuit U1 and pass through R23 ground connection by R25,10 pin connect the anodal of diode D1 and connect the 5V positive source by R24, the negative pole of diode D1 connects 25 pin of integrated circuit U1,1 pin of integrated circuit U3 and 3 pin connect the two ends of C8 respectively, 4 pin and 5 pin connect the two ends of C9 respectively, 2 pin connect the end of C10,16 pin connect the other end and the 5V positive source of C10,6 pin connect the end of C11, the 5 pin ground connection of the other end of 15 pin and C11 and socket RS-1,2 pin of 7 pin combination hub RS-1,3 pin of 8 pin combination hub RS-1, socket RS-1 is used to connect external computing machine.
The display circuit of present embodiment is connected and composed by integrated circuit U4, R30, R31, and the model of integrated circuit U4 is MG-12232.5 pin of integrated circuit U4 connect 52 pin of integrated circuit U1,6 pin connect 47 pin of integrated circuit U1,7 pin connect 44 pin of integrated circuit U1,8 pin connect 40 pin of integrated circuit U1,9 pin connect 73 pin of integrated circuit U1,10 pin connect 65 pin of integrated circuit U1,11 pin connect 62 pin of integrated circuit U1,12 pin connect 59 pin of integrated circuit U1,13 pin connect 55 pin of integrated circuit U1,14 pin connect 46 pin of integrated circuit U1,15 pin connect 38 pin of integrated circuit U1,16 pin connect 88 pin of integrated circuit U1,3 pin connect the 5V positive source by R31,17 pin connect the 5V positive source by R30,2 pin and 18 pin ground connection.
Principle of work of the present utility model is as follows:
The zero-sequence current input circuit is mainly to zero-sequence current conversion, adjusting, input.The zero-sequence current of input is converted to voltage signal through R13, filter filtering through C6, R1 1 connection, the biasing circuit that is connected by integrated circuit U2B, R11, R10, R9, R8 becomes unipolarity with this voltage signal, adjust size through the proportional governor that integrated circuit U2A, R7, R6, R5 connect, from the 107 pin input of integrated circuit U1.The residual voltage input circuit is mainly regulated, is imported residual voltage.The filter filtering that the residual voltage of input connects through C7, R22, the biasing circuit that is connected by integrated circuit U2D, R21, R20, R19, R18 becomes unipolarity with residual voltage, adjust size through the proportional governor that integrated circuit U2C, R17, R16, R15 connect, from the 109 pin input of integrated circuit U1.
81 human hair combing wastes that pass through of integrated circuit U1 go out resistor input signal, a certain phase that booster resistor is dropped into tested electrical network; Integrated circuit U1 detects residual voltage and the zero-sequence current of importing by built-in A/D converter, utilizes the program of setting to calculate the insulation against ground resistance and the ground capacitance of electrical network.Integrated circuit U1 can realize the measurement result between microcomputer and the utility model, the exchange of control information by 26 and 27 pin through serial communication circuit.Integrated circuit U1 and keyboard circuit can be realized parameter setting, measure command signal inputs such as power system operating mode selection, measurement result inquiry.The IOPE0 of integrated circuit U1～IOPE7 port outputs to integrated circuit U4 demonstration with the measurement result and the running status of the present utility model of line insulation impedance.
Claims (5)
1, a kind of line insulation impedance detection device is characterized in that it comprises:
The DSP application system that complete machine is controlled;
The zero-sequence current input circuit, the output termination DSP application system of this circuit;
The residual voltage input circuit, the output termination DSP application system of this circuit;
The keyboard input circuit, the output termination DSP application system of this circuit;
Serial communication circuit, this circuit is connected in the DSP application system;
It also comprises display circuit, the input termination DSP application system of this circuit.
2, according to the described line insulation impedance detection of claim 1 device, it is characterized in that said zero-sequence current input circuit is: the zero sequence current signal of input passes through R12, R11 is from the inverting input input of integrated circuit U2B, the in-phase input end of integrated circuit U2B is by R9 ground connection, inverting input connects the 2.5V positive source and connects output terminal by R8 by R10, output terminal connects the inverting input of integrated circuit U2A and connects inverting input by R8 by R7, the end of the termination R12 of R13, other end ground connection, the other end of the termination R12 of C6, other end ground connection, the in-phase input end of integrated circuit U2A is by R6 ground connection, inverting input connects output terminal by R5, output terminal connects the DSP application system by R4,4 pin connect the 3.3V positive source, 11 pin connect the 3.3V power cathode.
3, according to the described line insulation impedance detection of claim 1 device, it is characterized in that said residual voltage input circuit is: the residual voltage signal of input passes through R22, R21 is from the inverting input input of integrated circuit U2D, the in-phase input end of integrated circuit U2D is by R19 ground connection, inverting input connects the 2.5V positive source and connects output terminal by R18 by R20, output terminal connects the inverting input of integrated circuit U2C by R17, between the termination R21 and R22 of C7, other end ground connection, the in-phase input end of integrated circuit U2C is by R16 ground connection, inverting input connects output terminal by R15, output terminal connects the DSP application system by R14.
4, according to the described line insulation impedance detection of claim 2 device, it is characterized in that: the model of said integrated circuit U2A and integrated circuit U2B is MCP604.
5, according to the described line insulation impedance detection of claim 3 device, it is characterized in that: the model of said integrated circuit U2C and integrated circuit U2D is MCP604.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620079614 CN2938123Y (en) | 2006-08-21 | 2006-08-21 | Electric network insulation impedance detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620079614 CN2938123Y (en) | 2006-08-21 | 2006-08-21 | Electric network insulation impedance detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938123Y true CN2938123Y (en) | 2007-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620079614 Expired - Fee Related CN2938123Y (en) | 2006-08-21 | 2006-08-21 | Electric network insulation impedance detection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN2938123Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102687026A (en) * | 2010-08-31 | 2012-09-19 | 松下电器产业株式会社 | Insulation resistance detection device for vehicle |
| CN103441481A (en) * | 2013-09-14 | 2013-12-11 | 西安科技大学 | Self-adaptive selective leakage protection system and method for mine low-voltage electric network |
| CN108474818A (en) * | 2016-01-08 | 2018-08-31 | 三菱电机株式会社 | Determination of insulation resistance device |
-
2006
- 2006-08-21 CN CN 200620079614 patent/CN2938123Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102687026A (en) * | 2010-08-31 | 2012-09-19 | 松下电器产业株式会社 | Insulation resistance detection device for vehicle |
| CN102687026B (en) * | 2010-08-31 | 2014-08-27 | 松下电器产业株式会社 | Insulation resistance detection device for vehicle |
| US8878543B2 (en) | 2010-08-31 | 2014-11-04 | Panasonic Corporation | Vehicular insulation resistance detection apparatus |
| CN103441481A (en) * | 2013-09-14 | 2013-12-11 | 西安科技大学 | Self-adaptive selective leakage protection system and method for mine low-voltage electric network |
| CN103441481B (en) * | 2013-09-14 | 2015-07-22 | 西安科技大学 | Self-adaptive selective leakage protection system and method for mine low-voltage electric network |
| CN108474818A (en) * | 2016-01-08 | 2018-08-31 | 三菱电机株式会社 | Determination of insulation resistance device |
| CN108474818B (en) * | 2016-01-08 | 2021-01-15 | 三菱电机株式会社 | Insulation resistance measuring device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070822 Termination date: 20090921 |