CN202916333U - Zero sequence voltage detection device for 6-10kV circuit - Google Patents
Zero sequence voltage detection device for 6-10kV circuit Download PDFInfo
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- CN202916333U CN202916333U CN 201220615600 CN201220615600U CN202916333U CN 202916333 U CN202916333 U CN 202916333U CN 201220615600 CN201220615600 CN 201220615600 CN 201220615600 U CN201220615600 U CN 201220615600U CN 202916333 U CN202916333 U CN 202916333U
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- crystal diode
- resistance
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- circuit
- detection device
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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 description 9
- 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
- 230000002045 lasting effect Effects 0.000 description 2
- 238000000034 method Methods 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
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The utility model relates to the technical field of electric power detection, specifically to a zero sequence voltage detection device for a 6-10kV circuit, solving the problem that mistaken alarms and alarm missing frequently occur in an existing detection system directed at grounding faults of a 6-10kV circuit. The zero sequence voltage detection device for the 6-10kV circuit comprises a housing and a circuit arranged in the housing, the circuit includes 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) in sequence, and the cathode of the first crystal diode (D1) is grounded through a first capacitor (C1); and the anode of the first crystal diode (D1) is connected with an antenna (L), 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 for the 6-10kV circuit is reasonable in design and simple in structure.
Description
Technical field
The utility model relates to electric power detection technique field, is 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 the host computer communication that is installed on the electric pole and the fault detection terminal that is installed on the overhead transmission line, after overhead transmission line generation earth fault, fault detection terminal sends the ground connection transient current signal, the process wireless mode is sent to the host computer communication on the bar, after host computer communication receives, send a warning message to remote host by GPRS/CDMA, 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 can frequently cause fault detection terminal to send the ground connection transient current signal, cause the wrong report of host computer communication frequent occurrence; 2, for the fault detection terminal that is installed on the non-bare conductor of belt leather, electric field intensity reduces when earth fault occurs because the belt leather wire may cause, cause fault detection terminal when breaking down, can't detect electric field on the circuit, cause circuit reality that earth fault has occured but fault detection terminal does not send alerting signal, cause situation about failing to report to happen occasionally.
Summary of the invention
The utility model provides a kind of zero sequence voltage detection device of 6-10KV circuit in order to solve the problem of reporting by mistake and failing to report for the detection system frequent occurrence of 6-10KV line-to-ground fault at present.
The utility model is to adopt following technical scheme to realize:
A kind of zero sequence voltage detection device of 6-10KV circuit, comprise housing and place the interior circuit of housing, described circuit comprises first crystal diode D1, the negative electrode of described first crystal diode D1 is successively by the first resistance R 1 and the second resistance R 2 ground connection, and the negative electrode of first crystal diode D1 is by the first capacitor C 1 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 the plus earth of described the second crystal diode D2 with the negative electrode of the second crystal diode D2; Described the first resistance R 1 be connected the intermediate node of resistance R 2 and be connected with the base stage of negative-positive-negative transistor T1, 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 R 3; The collector of negative-positive-negative transistor T1 is connected with an end of the 4th resistance R 4, and the other end of described the 4th resistance R 4 is by the second capacitor C 2 ground connection, and the other end of the 4th resistance R 4 is output terminal.
Residual voltage is any one generation in the three-phase line with joining, and size depends on the degree of ground connection.
During work, pick-up unit described in the utility model is installed on the electric pole, with the input end of the output terminal incoming communication main frame of pick-up unit.When overhead distribution earth fault did not occur, the three-phase conducting wire voltage-to-ground was substantially equal, and residual voltage is lower, and the zero sequence voltage detection device is not enough to start; When earth fault occurs after, Earth Phase wire voltage-to-ground reduces, ungrounded phase conductor voltage-to-ground raises, produce larger residual voltage, behind the pole plate antenna reception, respond to generation current, through first, two crystal diode D1, the D2 rectification, after the voltage that is carried in the first resistance R 1 and the second resistance R 2 two ends is higher than setting value (setting value is by the resistance ratio-dependent of the first resistance R 1 and the second resistance R 2), negative-positive-negative transistor T1 conducting, the collector of negative-positive-negative transistor T1 becomes low level, the second capacitor C 2 is through the 4th resistance R 4 and negative-positive-negative transistor T1 discharge over the ground the parameter of the 4th resistance R 4 and second capacitor C 2 (select can change discharge time), after 2 discharges of the second capacitor C are finished, output terminal becomes low level, namely to host computer communication output low level alerting signal, shows this circuit generation earth fault.
During specific works, the detection system of 6-10KV line-to-ground fault comprises host computer communication, the zero sequence voltage detection device that is installed on the electric pole and is installed in fault detection terminal on the overhead transmission line.After overhead distribution generation earth fault, the fault detection terminal that is installed on the overhead transmission line sends the ground connection transient current signal, be sent to host computer communication through wireless mode, host computer communication detects zero sequence voltage detection device output signal simultaneously, when the zero sequence voltage detection device detects fault, can time-delay a period of time (for example 3 seconds) send the low level alerting signal, then, host computer communication sends alerting signal after comprehensively judging two paths of signals.If this moment, fault suddenly disappeared, zero sequence voltage detection device (for example 3 seconds) output high level warning slot signal of can delaying time a period of time equally.For avoiding thunderstorm, windage yaw, the transient faults such as load impact electric current cause the indicator wrong report, need whole detection system to surpass certain hour (for example more than 5 seconds) in the fault ground time and just send on the spot warning and distant place warning message, if there is above situation of bringing out wrong report, fault detection terminal on the circuit may send alerting signal immediately, through being wirelessly transmitted to host computer communication, after host computer communication receives, also to detect simultaneously the zero sequence voltage detection device and whether also quote simultaneously lasting earth fault low level alerting signal, if fault detection terminal sends warning, and the zero sequence voltage detection device does not send the low level alerting signal or send after transfer immediately high level warning slot signal to less than 3 seconds low level alerting signals, this moment, host computer communication can not send a warning message to remote host so, thereby had effectively avoided causing detection system the phenomenon of frequent wrong report to occur owing to the appearance of transient fault.
For the fault detection terminal that is installed on the non-bare conductor of belt leather, because electric field intensity reduced when the belt leather wire may cause earth fault to occur, fault detection terminal may can't detect the electric field on the circuit when breaking down, cause circuit reality earth fault to occur and fault detection terminal does not send alerting signal.In this case, host computer communication is after receiving that the zero sequence voltage detection device sends the low level alerting signal of lasting (more than 5 seconds), the curent change situation of wireless calling fault detection terminal immediately, if current break appears in fault detection terminal, and the low level alerting signal also appears continuing to send in the zero sequence voltage detection device, then host computer communication sends a warning message to remote host by GPRS/CDMA, thereby has effectively avoided detection system to fail to report the generation of situation.
The utility model is reasonable in design, simple in structure, has solved at present for the detection system frequent occurrence wrong report of 6-10KV line-to-ground fault and the problem of failing to report.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model one embodiment.
Among the figure: L-antenna, T1-NPN type transistor.
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the utility model is elaborated.
As shown in Figure 1, a kind of zero sequence voltage detection device of 6-10KV circuit, comprise housing and place the interior circuit of housing, described circuit comprises first crystal diode D1, the negative electrode of described first crystal diode D1 is successively by the first resistance R 1 and the second resistance R 2 ground connection, and the negative electrode of first crystal diode D1 is by the first capacitor C 1 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 the plus earth of described the second crystal diode D2 with the negative electrode of the second crystal diode D2.
Described the first resistance R 1 be connected the intermediate node of resistance R 2 and be connected with the base stage of negative-positive-negative transistor T1, 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 R 3; The collector of negative-positive-negative transistor T1 is connected with an end of the 4th resistance R 4, and the other end of described the 4th resistance R 4 is by the second capacitor C 2 ground connection, and the other end of the 4th resistance R 4 is output terminal.
During implementation, determine the resistance of the first resistance R 1 and the second resistance R 2 according to actual conditions, and then determine the detection sensitivity of this device.Determine the parameter of the 4th resistance R 4 and the second capacitor C 2 according to actual conditions, and then determine the delay time of this device.Described antenna L can select to place in the housing, also can select to place in the housing.
Claims (1)
1. the zero sequence voltage detection device of a 6-10kV circuit, comprise housing and place the interior circuit of 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 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 the second crystal diode (D2);
Described the first resistance (R1) be connected the intermediate node of resistance (R2) and be connected with the base stage of negative-positive-negative transistor (T1), 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 an end of the 4th resistance (R4), and the other end of described the 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 |
|---|---|---|---|
| CN 201220615600 CN202916333U (en) | 2012-11-20 | 2012-11-20 | Zero sequence voltage detection device for 6-10kV circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220615600 CN202916333U (en) | 2012-11-20 | 2012-11-20 | Zero sequence voltage detection device for 6-10kV circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916333U true CN202916333U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220615600 Expired - Fee Related CN202916333U (en) | 2012-11-20 | 2012-11-20 | Zero sequence voltage detection device for 6-10kV circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916333U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018540A (en) * | 2012-11-20 | 2013-04-03 | 山西省电力公司阳泉供电公司 | Zero-sequence voltage detection device of 6-10 KV circuit |
-
2012
- 2012-11-20 CN CN 201220615600 patent/CN202916333U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018540A (en) * | 2012-11-20 | 2013-04-03 | 山西省电力公司阳泉供电公司 | Zero-sequence voltage detection device of 6-10 KV circuit |
| CN103018540B (en) * | 2012-11-20 | 2015-07-01 | 山西省电力公司阳泉供电公司 | Zero-sequence voltage detection device of 6-10 KV circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20161120 |