CN203745580U - Electric power system resonance judgment and measurement device - Google Patents
Electric power system resonance judgment and measurement device Download PDFInfo
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- CN203745580U CN203745580U CN201420133450.3U CN201420133450U CN203745580U CN 203745580 U CN203745580 U CN 203745580U CN 201420133450 U CN201420133450 U CN 201420133450U CN 203745580 U CN203745580 U CN 203745580U
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- current sensor
- detecting instrument
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Abstract
The utility model discloses an electric power system resonance judgment and measurement device which is composed of a current sensor and a microcomputer detection device. The electric power system resonance judgment and measurement device is characterized in that the current sensor is connected with the microcomputer detection device via a secondary cable. When the electric power system resonance judgment and measurement device is used, the current sensor is installed between a primary neutral point of an all-insulation voltage mutual inductor and ground, wherein the upper end is connected with the primary neutral point of the voltage mutual inductor, and the lower end is grounded. The utility model provides the electric power system resonance judgment and measurement device which aims at problems in the existing electric power systems in China that resonance judgment is not timely and not accurate so that reliable equipment guarantee is provided for resonance fault alarm and elimination.
Description
Technical field
The utility model relates to judgement and the measuring technique of electric system resonance, one is arranged between neutral point of voltage transformer (VT) and ground specifically, the measurement of the zero-sequence current by a neutral point of convection current superpotential mutual inductor, the situation of judgement system generation resonance, for the control of resonance provides the device of basis for estimation accurately.
background technology
The intermediate voltage electric power system of China adopts neutral non-effective grounding mode mostly, this system has higher power supply reliability, but superpotential is relatively serious, particularly because of the nonlinear resonance of the saturated generation of voltage transformer (VT), common especially, not only amplitude is higher for it, and energy is very large, and can spread all over whole electrical network, destructiveness is very large, once superpotential occurs, often cause damage and the large-area power outage of electrical equipment.Record and the crash analysis of electrical production operation for many years show, in Medial & Low Voltage Power Network, Overvoltage great majority are all caused by resonance phenomena.
Resonance is in fault and singlephase earth fault, broken string, High-voltage Fuse Blow and Voltage Transformer Damages fault, from phenomenon, resemble in many points, in operational process, if judge unclearly, deal with improperly, processing time can be incured loss through delay, also, easily because judging the processing that makes the mistake by accident, make extremely to become accident, cause device damage.To resonance, judgement is all to determine according to the size of residual voltage at present, although this criterion is simple, cannot distinguish broken string, ground connection, fuse blows and mutual inductor self damage fault but exist, once there is erroneous judgement, not only affect the timely processing of fault, the processing of mistake also can cause larger accident, and consequence is serious.Adopt the criterion of residual voltage as resonance, for avoiding frequent erroneous judgement, need judgment threshold be arranged highlyer, its result causing is in the time that resonance just starts to occur, cannot detect, must wait resonance to develop into certain intensity time, then process, now resonance not only causes certain harm to system, and the resonance intractability of higher-strength is larger.The problems referred to above are urgently to be resolved hurrily.
Utility model content
The purpose of this utility model be exist for resonance judgement in the electric system of current China not in time, inaccurate problem, the device that a kind of electric system resonance judgement is provided and measures, for warning and the elimination of resonance fault provide reliable equipment guarantee.
For addressing the above problem, the technical solution of the utility model is:
1. the judgement of electric system resonance and a measurement mechanism, be made up of current sensor and pc detecting instrument, it is characterized in that, current sensor is connected with pc detecting instrument by secondary cable; Two equipment also have following characteristics separately:
(1) current sensor: the voltage transformer (VT) primary side that current sensor is arranged on a kind of all insulation over the ground between, upper end is connected to a neutral point of voltage transformer (VT), lower end ground connection;
(2) pc detecting instrument: pc detecting instrument is made up of embedded main board, analog quantity converter plate, communication module, alarm module, liquid crystal display and power supply, contains communication module and warning node in communication and alarm module; All boards are installed in 4U cabinet, and mainboard is the core of device, include internal memory, the Flash storer of 128M, the AD employing chip of 12M, the RS485 serial ports of 32 ARM13, the 32M of dominant frequency 500MHz;
(3) described mainboard is connected by back panel connector with analog converter plate, communication and alarm module and liquid crystal display; By secondary cable, the current signal of continuous current sensor is connected to the analog quantity converter plate of pc detecting instrument; By secondary cable, communication module is connected to upper managing computer.
2. the current sensor described in is zero sequence current mutual inductor or the Hall element of electromagnetic type.
The beneficial effects of the utility model:
The utility model judges resonance fault by detecting neutral point of voltage transformer (VT) current signal over the ground, have simple, reliable, failing to judge can avoid low earthquake intensity resonance time, also can avoid the interference of the faults such as system single-phase earthing, broken string, High-voltage Fuse Blow and Voltage Transformer Damages, be the accurate judgement of resonance fault and the convenient foundation of processing raising in time.
The utlity model has principle science, method is simple and reliable, advantage with low cost.
Brief description of the drawings
Fig. 1 is the structural representation of the judgement of the utility model electric system resonance and measurement mechanism.
Fig. 2 is pc detecting instrument hardware block diagram.
In figure: 1. current sensor LCK, 2. pc detecting instrument WLJ, 3. voltage transformer pt, 4. communication module, 5. liquid crystal display, 6. warning node, 7. G, 8. embedded main board, 9. analog quantity converter plate, 10. cable, 11. 4U cabinets, 12. CPU, 13. internal memories, 14.Flash storer, 15.AD, 16. back panel connectors, 17. demonstrations, 18. communications, 19. report to the police, 20. communications and alarm module.
Embodiment
Referring to Fig. 1, the utility model provide one be arranged on voltage transformer (VT) neutral point over the ground between, the device that detects to judge resonance and character thereof by the zero-sequence current of convection current superpotential mutual inductor neutral point, includes current sensor LCK1, pc detecting instrument WLJ2.
Described current sensor LCK1 is arranged between 3 neutral points of voltage transformer pt and ground G7 of a kind of all insulation, upper end is connected to 3 neutral points of voltage transformer pt, lower end ground connection, it can adopt electromagnetic current transducer, also can adopt Hall Element Current Sensor, the withstand voltage of this sensor must not be lower than AC5000V.
The principle of work of pc detecting instrument is:
Referring to Fig. 2, pc detecting instrument is made up of embedded main board 8, analog quantity converter plate 9, communication and alarm module 20, liquid crystal display 5 and power supply, contains communication module 4 and warning node 6 in communication and alarm module 20; All boards are installed in 4U cabinet 11, and mainboard is the core of device, include Flash storer 14, the AD15 employing chip of 12M, the RS485 serial ports of internal memory 13|, the 128M of 32 ARM, the 32M of dominant frequency 500MHz.Mainboard writes application program with compilation or C language.
The current signal of current sensor LCK1 accesses analog quantity converter plate 9A1 and A2 by cable 10, low-voltage simulation amount signal between converter signal is converted to-5V ~+5V, this analog quantity enters that embedded main board 8 is rear first carries out low-pass filtering and shaping, is then converted to digital signal by AD15.CPU12 calculates digital signal, calculate amplitude and the frequency of electric current, go out again the character of resonance according to the size of zero-sequence current amplitude and frequency analysis, preserve fault partial data, finally by calculatings and analysis result by liquid crystal display 5, communication module 4 and warning node 6 show respectively 17, communication 18 and warning 19.
Described mainboard is connected by back panel connector 16 with analog quantity converter plate 9, communication and alarm module 20 and liquid crystal display 5; By secondary cable 10, the current signal of continuous current sensor is connected to the analog quantity converter plate 9 of pc detecting instrument; By secondary cable 10, communication module 4 is connected to upper managing computer
The determination methods of resonance is:
When normal operation, electric current by a neutral point of voltage transformer (VT) is very little, general I0<3mA, in the time that system has resonance fault to occur, I0 will sharply increase, consider that voltage transformer (VT) has certain capability of overload, particularly short-time overload capacity is very large, for the reliability of assurance device, therefore we arrange in the time of I0>25mA, device is judged as resonance and occurs, at this moment I0 is calculated and analyzed, according to the amplitude of I0 and frequency, judge the earthquake intensity of occurred resonance and the character of resonance, but when I0>500mA, for high earthquake intensity resonance, need process immediately, survey numerical value according to real frequency, the fault that can accurately judge generation is high-frequency resonant, industrial frequency resonance or Subharmonic Resonance.Pick-up unit output alarm in the time that fault occurs, reminds staff to process, and records simultaneously and exports and calculate and analysis result, for accident treatment and analysis reference.
Claims (2)
1. a device for the judgement of electric system resonance and measurement, is made up of current sensor and pc detecting instrument, it is characterized in that, current sensor is connected with pc detecting instrument by secondary cable; Two equipment also have following characteristics separately:
(1) current sensor: the voltage transformer (VT) primary side that current sensor is arranged on a kind of all insulation over the ground between, upper end is connected to a neutral point of voltage transformer (VT), lower end ground connection;
(2) pc detecting instrument: pc detecting instrument is made up of embedded main board, analog quantity converter plate, communication and alarm module, liquid crystal display and power supply, contains communication module and warning node in communication and alarm module; All boards are installed in 4U cabinet, and mainboard is the core of device, include internal memory, the Flash storer of 128M, the AD16 employing chip of 12M, the RS485 serial ports of 32 ARM13, the 32M of dominant frequency 500MHz;
(3) described mainboard is connected by back panel connector with analog converter plate, communication and alarm module and liquid crystal display; By secondary cable, the current signal of continuous current sensor is connected to the analog quantity converter plate of pc detecting instrument; By secondary cable, communication module is connected to upper managing computer.
2. the device of a kind of electric system resonance judgement according to claim 1 and measurement, is characterized in that, described current sensor is zero sequence current mutual inductor or the Hall element of electromagnetic type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420133450.3U CN203745580U (en) | 2014-03-24 | 2014-03-24 | Electric power system resonance judgment and measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420133450.3U CN203745580U (en) | 2014-03-24 | 2014-03-24 | Electric power system resonance judgment and measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745580U true CN203745580U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420133450.3U Expired - Fee Related CN203745580U (en) | 2014-03-24 | 2014-03-24 | Electric power system resonance judgment and measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203745580U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837780A (en) * | 2014-03-24 | 2014-06-04 | 安徽泰隆电气有限公司 | Device for judging and measuring resonance of electric power system |
-
2014
- 2014-03-24 CN CN201420133450.3U patent/CN203745580U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837780A (en) * | 2014-03-24 | 2014-06-04 | 安徽泰隆电气有限公司 | Device for judging and measuring resonance of electric power system |
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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: 20140730 Termination date: 20180324 |