CN103123375A - Temporary ground wire detection device for substation - Google Patents
Temporary ground wire detection device for substation Download PDFInfo
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- CN103123375A CN103123375A CN2012103408047A CN201210340804A CN103123375A CN 103123375 A CN103123375 A CN 103123375A CN 2012103408047 A CN2012103408047 A CN 2012103408047A CN 201210340804 A CN201210340804 A CN 201210340804A CN 103123375 A CN103123375 A CN 103123375A
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- 239000003990 capacitor Substances 0.000 claims description 16
- 230000001419 dependent effect Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention discloses a temporary ground wire detection device for a substation. The temporary ground wire detection device comprises a signal source VSS, a current-limiting circuit, a resonance and voltage-dividing circuit, a single chip microcomputer U1 and a display circuit. An output end of the signal source VSS is connected with an input end of the current-limiting circuit, an output end of the current-limiting circuit is respectively connected with an input end of the resonance and voltage-dividing circuit and an in-station line, an output end of the resonance and voltage-dividing circuit is connected with a corresponding input end of the single chip microcomputer U1, and an output end of the single chip microcomputer U1 is connected with an input end of the display circuit. The temporary ground wire detection device has the advantages that whether a temporary ground wire is arranged in the substation currently or not can be effectively detected, and the temporary ground wire detection device is portable and convenient and rapid to operate.
Description
Technical field
The present invention relates to a kind of transformer station line detector provisionally.
Background technology
At present, prevent that tearing because of leakage the switching on earth wire accident that in Substation Station, ground wire causes open occurs repeatedly, the Main Means that prevents this accident is the management work of strengthening interim ground wire, relies on staff's subjective ability to solve this problem.Have unavoidably in working at ordinary times due to the staff and the error such as forget and occur, therefore also just can not stop the switching on earth wire accident fully by the means of labor management.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of convenient to operation, portable transformer station line detector provisionally.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention includes signal source VSS, current-limiting circuit, resonance and bleeder circuit, single-chip microcomputer U1 and display circuit; The input end of the output termination current-limiting circuit of described signal source VSS; The output terminal of described current-limiting circuit connects respectively input end and the Divergent line of resonance and bleeder circuit; The output terminal of described resonance and bleeder circuit connects the respective input of single-chip microcomputer U1; The input end of the output termination display circuit of described single-chip microcomputer U1.
Described current-limiting circuit is comprised of current-limiting resistance R1; The output terminal of the M termination signal source VSS of described current-limiting resistance R1; The N end of described current-limiting resistance R1 is connected with A phase, B phase, the C of Divergent line respectively.
Described resonance and bleeder circuit comprise inductance L, capacitor C 1, voltage dependent resistor (VDR) R2, divider resistance R3-R4 and variable resistor R7; The series resonant circuit that described inductance L and capacitor C 1 form is connected between the N end and ground of current-limiting resistance R1; Described voltage dependent resistor (VDR) R2 is connected between the N end and ground of current-limiting resistance R1; In parallel with voltage dependent resistor (VDR) R2 after described divider resistance R3 and divider resistance R4 series connection; The termination divider resistance R3 of described variable resistor R7 and the node of divider resistance R4.
Described resonance and bleeder circuit also comprise filter capacitor C2; Described filter capacitor C2 is connected between the G end and ground of variable resistor R7.
The model of described single-chip microcomputer U1 is STC12C5A60S2; The input terminal P1.0 of described single-chip microcomputer U1 connects the G end of variable resistor R7.
Described display circuit is comprised of current-limiting resistance R5-R6 and LED 1-LED2; Described current-limiting resistance R5 be connected between the lead-out terminal P3.3 and ground of single-chip microcomputer U1 after LED 1 is connected; Described current-limiting resistance R6 be connected between the lead-out terminal P3.4 and ground of single-chip microcomputer U1 after LED 2 is connected.
The invention has the beneficial effects as follows effectively to detect in current transformer station to have or not temporary ground wire, have characteristics portable, convenient to operation.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is the algorithm filtering process flow diagram of single-chip microcomputer U1.
In Fig. 2, L1 is that Divergent line, L2 are that alive circuit, VSS are that signal source, R1, R5 and R6 are that current-limiting resistance, R2 are voltage dependent resistor (VDR)s, and R3-R4 is that divider resistance, U1 are that single-chip microcomputer, LED1 are that light emitting diode (redness), LED2 are that light emitting diode (green), C1 are that electric capacity, C2 are that filter capacitor, L are that inductance, R7 are that variable resistor, S are interim ground wire analog switch (for the switch of explanation principle of work hypothesis of the present invention).
Embodiment
By the embodiment shown in accompanying drawing 1,2 as can be known, the present invention includes signal source VSS, current-limiting circuit, resonance and bleeder circuit, single-chip microcomputer U1 and display circuit; The input end of the output termination current-limiting circuit of described signal source VSS; The output terminal of described current-limiting circuit connects respectively input end and the Divergent line of resonance and bleeder circuit; The output terminal of described resonance and bleeder circuit connects the respective input of single-chip microcomputer U1; The input end of the output termination display circuit of described single-chip microcomputer U1.
Described current-limiting circuit is comprised of current-limiting resistance R1; The output terminal of the M termination signal source VSS of described current-limiting resistance R1; The N end of described current-limiting resistance R1 is connected with A phase, B phase, the C of Divergent line respectively.
Described resonance and bleeder circuit comprise inductance L, capacitor C 1, voltage dependent resistor (VDR) R2, divider resistance R3-R4 and variable resistor R7; The series resonant circuit that described inductance L and capacitor C 1 form is connected between the N end and ground of current-limiting resistance R1; Described voltage dependent resistor (VDR) R2 is connected between the N end and ground of current-limiting resistance R1; In parallel with voltage dependent resistor (VDR) R2 after described divider resistance R3 and divider resistance R4 series connection; The termination divider resistance R3 of described variable resistor R7 and the node of divider resistance R4.
Described resonance and bleeder circuit also comprise filter capacitor C2; Described filter capacitor C2 is connected between the G end and ground of variable resistor R7.
The model of described single-chip microcomputer U1 is STC12C5A60S2; The input terminal P1.0 of described single-chip microcomputer U1 connects the G end of variable resistor R7.
Described display circuit is comprised of current-limiting resistance R5-R6 and LED 1-LED2; Described current-limiting resistance R5 be connected between the lead-out terminal P3.3 and ground of single-chip microcomputer U1 after LED 1 is connected; Described current-limiting resistance R6 be connected between the lead-out terminal P3.4 and ground of single-chip microcomputer U1 after LED 2 is connected.
Principle of work of the present invention:
by the embodiment shown in accompanying drawing 1-2 as can be known, inductance L and capacitor C 1 form series resonant circuit, if when having interim ground wire (S is closed), signal source VSS, current-limiting resistance R1, Divergent line L1, interim ground wire consists of the loop, during design, current-limiting resistance R1 is much larger than the impedance of Divergent line, so bear voltage on current-limiting resistance R1 and signal source voltage is about the same, the voltage waveform that get on divider resistance R4 this moment is interference waveform, filter capacitor C2 carries out low-pass filtering after the R7 variable resistor, the filtering processing and the predefined threshold values of single-chip microcomputer U1 (ratings of input signal corresponding frequencies component) that pass through single-chip microcomputer U1 compare again, after filtering this moment, numerical value is less than threshold values, the lead-out terminal P3.3 of single-chip microcomputer U1 exports high level, lead-out terminal P3.4 output low level, lead-out terminal P3.3 output high level is through current-limiting resistance R5 conducting LED 1, when red, prompting has interim ground wire.on the contrary, if when not having interim ground wire (S disconnection), signal source VSS, current-limiting resistance R1, Divergent line L1, interim ground wire can't consist of the loop, bear theoretical value this moment on current-limiting resistance R1 be zero, the waveform of the voltage of getting on divider resistance R4 is the waveform of signal source VSS and the stack of interference, and the amplitude of the voltage of getting on divider resistance R4 is no more than the ceiling voltage that single-chip microcomputer U1 can bear, filter capacitor C2 carries out low-pass filtering after the R7 variable resistor, processed by single-chip microcomputer U1 filtering again, threshold values predefined with it relatively, after filtering this moment, numerical value is greater than threshold values, the lead-out terminal P3.3 output low level of single-chip microcomputer U1, lead-out terminal P3.4 exports high level, lead-out terminal P3.4 output high level is through current-limiting resistance R6 conducting LED 2, green light is bright, prompting is without interim ground wire.
Hence one can see that, and the voltage swing that has or not interim ground wire to cause current-limiting resistance R1 to bear in transformer station is different, is used as judging that with this foundation that has or not haywire in station drives different LED 1 and LED 2.
The algorithm filtering of single-chip microcomputer U1 (seeing accompanying drawing 3) mainly comprises following concrete steps:
(1) filter brings into operation, system initialization table: single-chip microcomputer U1 is with original internal storage location zero clearing, for next step storage A/D transformation result is prepared;
(2) the discrete data sequence with the A/D conversion is deposited into the specific internal storage location of single-chip microcomputer U1 (coefficient table);
(3) data in coefficient table are carried out inverted order, carry out the FFT computing for next step data and prepare;
The data of (4) carrying out inverted order in the internal storage location of depositing in advance the FFT program first calls coefficient table are carried out the FFT computing again;
(5) amplitude of its corresponding frequencies component of output after computing is completed;
(6) finish the algorithm filtering.
Claims (6)
1. transformer station line detector provisionally, is characterized in that comprising signal source VSS, current-limiting circuit, resonance and bleeder circuit, single-chip microcomputer U1 and display circuit; The input end of the output termination current-limiting circuit of described signal source VSS; The output terminal of described current-limiting circuit connects respectively input end and the Divergent line of resonance and bleeder circuit; The output terminal of described resonance and bleeder circuit connects the respective input of single-chip microcomputer U1; The input end of the output termination display circuit of described single-chip microcomputer U1.
2. a kind of transformer station according to claim 1 line detector provisionally, is characterized in that described current-limiting circuit is comprised of current-limiting resistance R1; The output terminal of the M termination signal source VSS of described current-limiting resistance R1; The N end of described current-limiting resistance R1 is connected with A phase, B phase, the C of Divergent line respectively.
3. a kind of transformer station according to claim 1 and 2 line detector provisionally, is characterized in that described resonance and bleeder circuit comprise inductance L, capacitor C 1, voltage dependent resistor (VDR) R2, divider resistance R3-R4 and variable resistor R7; The series resonant circuit that described inductance L and capacitor C 1 form is connected between the N end and ground of current-limiting resistance R1; Described voltage dependent resistor (VDR) R2 is connected between the N end and ground of current-limiting resistance R1; In parallel with voltage dependent resistor (VDR) R2 after described divider resistance R3 and divider resistance R4 series connection; The termination divider resistance R3 of described variable resistor R7 and the node of divider resistance R4.
4. a kind of transformer station according to claim 3 line detector provisionally, is characterized in that described resonance and bleeder circuit also comprise filter capacitor C2; Described filter capacitor C2 is connected between the G end and ground of variable resistor R7.
5. a kind of transformer station according to claim 4 line detector provisionally, the model that it is characterized in that described single-chip microcomputer U1 is STC12C5A60S2; The input terminal P1.0 of described single-chip microcomputer U1 connects the G end of variable resistor R7.
6. a kind of transformer station according to claim 5 line detector provisionally, is characterized in that described display circuit is comprised of current-limiting resistance R5-R6 and LED 1-LED2; Described current-limiting resistance R5 be connected between the lead-out terminal P3.3 and ground of single-chip microcomputer U1 after LED 1 is connected; Described current-limiting resistance R6 be connected between the lead-out terminal P3.4 and ground of single-chip microcomputer U1 after LED 2 is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210340804.7A CN103123375B (en) | 2012-09-15 | 2012-09-15 | Temporary ground wire detection device for substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210340804.7A CN103123375B (en) | 2012-09-15 | 2012-09-15 | Temporary ground wire detection device for substation |
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| Publication Number | Publication Date |
|---|---|
| CN103123375A true CN103123375A (en) | 2013-05-29 |
| CN103123375B CN103123375B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210340804.7A Expired - Fee Related CN103123375B (en) | 2012-09-15 | 2012-09-15 | Temporary ground wire detection device for substation |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2119041U (en) * | 1992-04-02 | 1992-10-14 | 赵根田 | Device for preventing close switch with earthed wire |
| JPH09329632A (en) * | 1996-06-10 | 1997-12-22 | Nippon Telegr & Teleph Corp <Ntt> | Method for measuring ground resistance |
| JP2001242206A (en) * | 2000-02-29 | 2001-09-07 | Multi Keisokuki Kk | Measuring method of grounding resistance |
| CN201917625U (en) * | 2010-11-19 | 2011-08-03 | 山东电力集团公司临沂供电公司 | Monitor for earth wire of power transmission line |
| CN202111863U (en) * | 2011-01-24 | 2012-01-11 | 武汉奋进电力技术有限公司 | Monitoring system capable of monitoring grounding wire state of transformer substation |
| CN102385023A (en) * | 2011-10-24 | 2012-03-21 | 石家庄供电公司 | Intelligent high-voltage circuit grounding detector |
| CN102509245A (en) * | 2011-10-21 | 2012-06-20 | 亿达信息技术有限公司 | Temporary grounding wire management method and system |
| CN202854245U (en) * | 2012-09-15 | 2013-04-03 | 华北电力大学（保定） | Temporary ground wire detection device for transformer substation |
-
2012
- 2012-09-15 CN CN201210340804.7A patent/CN103123375B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2119041U (en) * | 1992-04-02 | 1992-10-14 | 赵根田 | Device for preventing close switch with earthed wire |
| JPH09329632A (en) * | 1996-06-10 | 1997-12-22 | Nippon Telegr & Teleph Corp <Ntt> | Method for measuring ground resistance |
| JP2001242206A (en) * | 2000-02-29 | 2001-09-07 | Multi Keisokuki Kk | Measuring method of grounding resistance |
| CN201917625U (en) * | 2010-11-19 | 2011-08-03 | 山东电力集团公司临沂供电公司 | Monitor for earth wire of power transmission line |
| CN202111863U (en) * | 2011-01-24 | 2012-01-11 | 武汉奋进电力技术有限公司 | Monitoring system capable of monitoring grounding wire state of transformer substation |
| CN102509245A (en) * | 2011-10-21 | 2012-06-20 | 亿达信息技术有限公司 | Temporary grounding wire management method and system |
| CN102385023A (en) * | 2011-10-24 | 2012-03-21 | 石家庄供电公司 | Intelligent high-voltage circuit grounding detector |
| CN202854245U (en) * | 2012-09-15 | 2013-04-03 | 华北电力大学（保定） | Temporary ground wire detection device for transformer substation |
Non-Patent Citations (2)
| Title |
|---|
| 张作宇 等: "一种接地地线的检测系统", 《电网与清洁能源》, vol. 26, no. 12, 31 December 2010 (2010-12-31) * |
| 黄锐 等: "变电站临时接地线在线监测系统", 《中国高新技术企业》, no. 33, 31 December 2010 (2010-12-31), pages 87 - 88 * |
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| CN103123375B (en) | 2015-07-08 |
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Granted publication date: 20150708 |