CN103018540B - Zero-sequence voltage detection device of 6-10 KV circuit - Google Patents
Zero-sequence voltage detection device of 6-10 KV circuit Download PDFInfo
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- CN103018540B CN103018540B CN201210471248.7A CN201210471248A CN103018540B CN 103018540 B CN103018540 B CN 103018540B CN 201210471248 A CN201210471248 A CN 201210471248A CN 103018540 B CN103018540 B CN 103018540B
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- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 239000013078 crystal Substances 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 15
- 230000001052 transient effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 239000010985 leather Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The invention relates to the technical field of power detection, and particularly relates to a zero-sequence voltage detection device of a 6-10 KV circuit. The zero-sequence voltage detection device of the 6-10 KV circuit solves the problem that a detection system aiming at the ground fault of the 6-10 KV circuit frequently generates false alarm and missed alarm at present. The zero-sequence voltage detection device of the 6-10 KV circuit comprises a shell and a circuit, wherein the circuit is arranged in the shell, and the circuit comprises a first crystal diode (D1); the cathode of the first crystal diode (D1) is grounded through a first resistor (R1) and a second resistor (R2) sequentially, and the cathode of the first crystal diode (D1) is grounded through a first capacitor (C1); the anode of the first crystal diode (D1) is connected with an antenna (L), and the anode of the first crystal diode (D1) is connected with the cathode of a second crystal diode (D2); and the anode of the second crystal diode (D2) is grounded. The zero-sequence voltage detection device disclosed by the invention is reasonable in design and simple in structure.
Description
Technical field
The present invention relates to technical field of electric power detection, be specially a kind of zero sequence voltage detection device of 6-10KV circuit.
Background technology
At present, detection system for 6-10KV line-to-ground fault comprises installation host computer communication on utility poles and is arranged on the fault detection terminal on overhead transmission line, when after overhead transmission line generation earth fault, fault detection terminal sends ground connection transient current signal, the host computer communication on bar is sent to through wireless mode, after host computer communication receives, by GPRS/CDMA distally main frame send a warning message, show this overhead transmission line generation earth fault.But the shortcoming that said method exists is as follows: 1, because the transient faults such as thunderstorm, windage yaw, load impact electric current frequent causing trouble sense terminals can send ground connection transient current signal, cause host computer communication frequently to be reported by mistake; 2, for the fault detection terminal be arranged on the non-bare conductor of belt leather, because belt leather wire may cause the electric field intensity when there is earth fault to reduce, cause fault detection terminal electric field on circuit cannot be detected when breaking down, cause circuit reality earth fault to occur but fault detection terminal does not send alerting signal, cause situation about failing to report to happen occasionally.
Summary of the invention
The present invention, in order to solve at present for the problem that the detection system of 6-10KV line-to-ground fault wrong report frequently occurs and fails to report, provides a kind of zero sequence voltage detection device of 6-10KV circuit.
The present invention adopts following technical scheme to realize:
A kind of zero sequence voltage detection device of 6-10KV circuit, comprise housing and be placed in the circuit in housing, described circuit comprises first crystal diode D1, the negative electrode of described first crystal diode D1 is successively by the first resistance R1 and the second resistance R2 ground connection, and the negative electrode of first crystal diode D1 is by the first electric capacity C1 ground connection; The anode of described first crystal diode D1 is connected with antenna L, and the anode of first crystal diode D1 is connected with the negative electrode of the second crystal diode D2, the plus earth of described second crystal diode D2; Described first resistance R1 is connected with the base stage of negative-positive-negative transistor T1 with the intermediate node of the second resistance R2, the grounded emitter of described negative-positive-negative transistor T1, and the collector of negative-positive-negative transistor T1 is connected with power supply VCC by the 3rd resistance R3; The collector of negative-positive-negative transistor T1 is connected with one end of the 4th resistance R4, and the other end of described 4th resistance R4 is by the second electric capacity C2 ground connection, and the other end of the 4th resistance R4 is output terminal.
Residual voltage any one to produce with connecting in three-phase line, and size depends on the degree of ground connection.
During work, pick-up unit of the present invention is installed on utility poles, by the input end of the output terminal incoming communication main frame of pick-up unit.When earth fault does not occur overhead distribution, three-phase conducting wire voltage-to-ground is substantially equal, and residual voltage is lower, and zero sequence voltage detection device is not enough to start, when after generation earth fault, Earth Phase wire voltage-to-ground reduces, ungrounded phase conductor voltage-to-ground raises, produce larger residual voltage, generation current is responded to after pole plate antenna receives, through first, two crystal diode D1, D2 rectification, after the voltage being carried in the first resistance R1 and the second resistance R2 two ends is higher than setting value (setting value is by the resistance ratio-dependent of the first resistance R1 and the second resistance R2), negative-positive-negative transistor T1 conducting, the collector of negative-positive-negative transistor T1 becomes low level, second electric capacity C2 discharges (Selecting parameter of the 4th resistance R4 and the second electric capacity C2 can change discharge time) over the ground through the 4th resistance R4 and negative-positive-negative transistor T1, after second electric capacity C2 has discharged, output terminal becomes low level, namely to host computer communication output low level alerting signal, show this circuit generation earth fault.
During specific works, the fault detection terminal that the detection system of 6-10KV line-to-ground fault comprises installation host computer communication on utility poles, zero sequence voltage detection device and is arranged on overhead transmission line.When after overhead distribution generation earth fault, the fault detection terminal be arranged on overhead transmission line sends ground connection transient current signal, host computer communication is sent to through wireless mode, host computer communication detects zero sequence voltage detection device output signal simultaneously, when zero sequence voltage detection device detects fault, time delay a period of time (such as 3 seconds) low level alerting signal can be sent, then, after host computer communication comprehensive descision two paths of signals, send alerting signal.If now fault suddenly disappears, zero sequence voltage detection device is understood time delay a period of time equally (such as 3 seconds) exports high level warning slot signal.For avoiding thunderstorm, windage yaw, the transient faults such as load impact electric current cause indicator to be reported by mistake, need whole detection system to exceed certain hour (such as more than 5 seconds) in the fault ground time and just send warning and distant place warning message on the spot, if there is the situation of bringing out wrong report above, fault detection terminal on circuit may send alerting signal immediately, through being wirelessly transmitted to host computer communication, after host computer communication receives, also to detect zero sequence voltage detection device simultaneously and whether also quote lasting earth fault low level alerting signal simultaneously, if fault detection terminal sends warning, and zero sequence voltage detection device does not send low level alerting signal or transfer high level warning slot signal immediately to less than 3 seconds low level alerting signals after sending, so now host computer communication can not distally send a warning message by main frame, thus effectively prevent the phenomenon causing the frequent wrong report of detection system appearance due to the appearance of transient fault.
For the fault detection terminal be arranged on the non-bare conductor of belt leather, because electric field intensity when belt leather wire may cause earth fault to occur reduces, fault detection terminal may cannot detect the electric field on circuit when breaking down, cause that circuit reality earth fault occurs and fault detection terminal does not send alerting signal.In this case, host computer communication is after receiving zero sequence voltage detection device and sending the low level alerting signal of lasting (more than 5 seconds), the curent change situation of wireless calling fault detection terminal immediately, if there is current break in fault detection terminal, and zero sequence voltage detection device also occurs continuing to send low level alerting signal, then host computer communication by GPRS/CDMA distally main frame send a warning message, thus effectively prevent the generation that detection system fails to report situation.
The present invention is reasonable in design, structure is simple, solves at present for the problem that the detection system of 6-10KV line-to-ground fault wrong report frequently occurs and fails to report.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of one embodiment of the invention.
In figure: L-antenna, T1-NPN type transistor.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
As shown in Figure 1, a kind of zero sequence voltage detection device of 6-10KV circuit, comprise housing and be placed in the circuit in housing, described circuit comprises first crystal diode D1, the negative electrode of described first crystal diode D1 is successively by the first resistance R1 and the second resistance R2 ground connection, and the negative electrode of first crystal diode D1 is by the first electric capacity C1 ground connection; The anode of described first crystal diode D1 is connected with antenna L, and the anode of first crystal diode D1 is connected with the negative electrode of the second crystal diode D2, the plus earth of described second crystal diode D2.
Described first resistance R1 is connected with the base stage of negative-positive-negative transistor T1 with the intermediate node of the second resistance R2, the grounded emitter of described negative-positive-negative transistor T1, and the collector of negative-positive-negative transistor T1 is connected with power supply VCC by the 3rd resistance R3; The collector of negative-positive-negative transistor T1 is connected with one end of the 4th resistance R4, and the other end of described 4th resistance R4 is by the second electric capacity C2 ground connection, and the other end of the 4th resistance R4 is output terminal.
During concrete enforcement, determine the resistance of the first resistance R1 and the second resistance R2 according to actual conditions, and then determine the detection sensitivity of this device.Determine the parameter of the 4th resistance R4 and the second electric capacity C2 according to actual conditions, and then determine the delay time of this device.Described antenna L can select to be placed in housing, also can select to be placed in housing.
Claims (1)
1. the zero sequence voltage detection device of a 6-10KV circuit, comprise housing and be placed in the circuit in housing, it is characterized in that: described circuit comprises first crystal diode (D1), the negative electrode of described first crystal diode (D1) is successively by the first resistance (R1) and the second resistance (R2) ground connection, and the negative electrode of first crystal diode (D1) is again by the first electric capacity (C1) ground connection; The anode of described first crystal diode (D1) is connected with antenna (L), and the anode of first crystal diode (D1) is connected with the negative electrode of the second crystal diode (D2), the plus earth of described second crystal diode (D2);
Described first resistance (R1) is connected with the base stage of negative-positive-negative transistor (T1) with the intermediate node of the second resistance (R2), the grounded emitter of described negative-positive-negative transistor (T1), the collector of negative-positive-negative transistor (T1) is connected with power supply (VCC) by the 3rd resistance (R3); The collector of negative-positive-negative transistor (T1) is connected with one end of the 4th resistance (R4), and the other end of described 4th resistance (R4) is by the second electric capacity (C2) ground connection, and the other end of the 4th resistance (R4) is output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210471248.7A CN103018540B (en) | 2012-11-20 | 2012-11-20 | Zero-sequence voltage detection device of 6-10 KV circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210471248.7A CN103018540B (en) | 2012-11-20 | 2012-11-20 | Zero-sequence voltage detection device of 6-10 KV circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103018540A CN103018540A (en) | 2013-04-03 |
| CN103018540B true CN103018540B (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210471248.7A Active CN103018540B (en) | 2012-11-20 | 2012-11-20 | Zero-sequence voltage detection device of 6-10 KV circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226651B (en) * | 2016-07-12 | 2019-08-23 | 国电南瑞科技股份有限公司 | A kind of overhead type indicating fault positioning terminal and voltage-to-ground measurement method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105511A (en) * | 2007-08-04 | 2008-01-16 | 深圳市拓邦电子科技股份有限公司 | Switch tube voltage zero-crossing detection system and method |
| CN201892702U (en) * | 2010-11-25 | 2011-07-06 | 宁波舜韵电子有限公司 | Zero cross detection circuit |
| CN102486492A (en) * | 2010-12-06 | 2012-06-06 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection circuit |
| CN202916333U (en) * | 2012-11-20 | 2013-05-01 | 山西省电力公司阳泉供电公司 | Zero sequence voltage detection device for 6-10kV circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004056980A (en) * | 2002-07-24 | 2004-02-19 | Fuji Electric Holdings Co Ltd | Voltage detecting circuit of semiconductor switching element |
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- 2012-11-20 CN CN201210471248.7A patent/CN103018540B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105511A (en) * | 2007-08-04 | 2008-01-16 | 深圳市拓邦电子科技股份有限公司 | Switch tube voltage zero-crossing detection system and method |
| CN201892702U (en) * | 2010-11-25 | 2011-07-06 | 宁波舜韵电子有限公司 | Zero cross detection circuit |
| CN102486492A (en) * | 2010-12-06 | 2012-06-06 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection circuit |
| CN202916333U (en) * | 2012-11-20 | 2013-05-01 | 山西省电力公司阳泉供电公司 | Zero sequence voltage detection device for 6-10kV circuit |
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| CN103018540A (en) | 2013-04-03 |
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