CN202600034U - Power grid overvoltage signal detection system - Google Patents
Power grid overvoltage signal detection system Download PDFInfo
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- CN202600034U CN202600034U CN 201220253128 CN201220253128U CN202600034U CN 202600034 U CN202600034 U CN 202600034U CN 201220253128 CN201220253128 CN 201220253128 CN 201220253128 U CN201220253128 U CN 201220253128U CN 202600034 U CN202600034 U CN 202600034U
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Abstract
The utility model discloses a power grid overvoltage signal detection system. According to the system, a capacitive sensor is connected between a power grid bus and a ground wire, a voltage signal in the power grid bus is acquired by a low-frequency current sensor, and finally, the voltage signal is processed, whether the voltage signal is an overvoltage signal is judged, and the overvoltage signal is automatically acquired, transmitted and saved. The power grid overvoltage signal detection system comprises a capacitive sensor, a current sensor, an integral circuit, an amplification circuit, a signal conditioning waveform reconstruction and trigger unit, a signal acquisition unit and a data transmission and storage system. The current signal is acquired through a capacitive voltage sensor, the system is not directly and electrically connected with the primary power grid equipment, the insulating performance is high, the safety operation of the power grid is not influenced, the primary wiring of the electric equipment is not changed, the overvoltage is reconstructed by utilizing current, and the overvoltage waveform is automatically recorded in real time. The power grid overvoltage signal detection system has high electromagnetic compatible characteristics and protection measures, the measurement system is prevented from being damaged due to overvoltage, and the thunder and lightning are not introduced into the mains supply system.
Description
Technical field
The utility model relates to a kind of device of real-time detection of grid voltage, particularly a kind of power network overvoltage signal detection system.
Background technology
Power network overvoltage is the important hidden danger that influences transmission line of electricity and converting equipment security of operation, and transmission line of electricity and device security are caused great influence.The real-time monitoring system superpotential realizes obtaining of operation of power networks state, is convenient to carry out crash analysis and insulation of electrical installation and cooperates.Conventional over-voltage monitoring mode adopts voltage divider or the external superpotential voltage divider of bottom shielding of bushing, has added an electrical equipment or has changed the mode of connection, under the sensor fault situation, possibly cause power grid accident.
Therefore be badly in need of whether a kind of electrical equipment primary connection mode that do not change can detection of grid voltage be overvolatge device just.
The utility model content
In view of this, the utility model technical matters to be solved provides whether a kind of electrical equipment primary connection mode that do not change can detection of grid voltage be overvolatge device just.This device is isolated with primary system, and is safe and reliable.
The purpose of the utility model proposes a kind of power network overvoltage signal detection system.
The purpose of the utility model realizes through following technical scheme:
The power network overvoltage signal detection system that the utility model provides comprises capacitive pick-up, low-frequency current sensor, active integrating circuit, first amplifying circuit, the reconstruct of signal condition waveform and trigger element, signal gathering unit and data transmission and saved system;
Said capacitive pick-up is connected between electrical network bus and the ground wire;
Be provided with the low-frequency current sensor between said capacitive pick-up and the ground wire;
Said active integrating circuit is connected with the low-frequency current sensor;
Said first amplifying circuit is used to receive the current signal of low-frequency current sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of first amplifying circuit is also exported the trigger pip that transfinites;
Said signal gathering unit is used to gather the voltage signal that transfinites that voltage magnitude surpasses the setting threshold trigger voltage;
Said data transmission and saved system are used to transmit and preserve the overvoltage signal of gathering.
Further, also comprise High Frequency Current Sensor, passive active integration and second amplifying circuit;
Said High Frequency Current Sensor is connected between low frequency High Frequency Current Sensor and the ground wire;
Said High Frequency Current Sensor is connected with passive active integration;
Said second amplifying circuit is used to receive the current signal of High Frequency Current Sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of second amplifying circuit is also exported the trigger pip that transfinites.
Further, said cable is the double layer screen cable, said cable head double layer screen ground connection, and terminal outer shielding open circuit, the internal layer shielding connects the signal ground of acquisition system.
Further, the power supply of said signal gathering unit adopts the isolating transformer power supply.
Further, said capacitive pick-up is the voltage sensor based on the capacitive apparatus leakage current, and said voltage sensor is the capacitive transformer sleeve pipe.
The advantage of the utility model is: the utility model adopts the voltage sensor of capacitive apparatus to obtain current signal; Directly be not electrically connected with the electrical network primary equipment, good insulation preformance, do not influence electric power netting safe running, under the situation of the primary connection mode that does not change electrical equipment, utilize electric current reconstructing over-voltage waveform real-time automatic recording over-voltage waveform.Have good electromagnetic compatibility characteristic and safeguard measure, prevent superpotential damage measuring system, can not thunder and lightning be introduced mains system;
Adopting two current sensors of high and low frequency that electric current is carried out segmentation detects; Its medium and low frequency sensor is used for the detection to vagabond current of power-frequency voltage and switching overvoltage effect running casing, and the another one high frequency sensors is used for the detection of lightning impulse effect running casing to vagabond current.
Cable adopts the double layer screen cable, head end double layer screen ground connection, and terminal outer shielding open circuit, the internal layer shielding connects the signal ground of acquisition system.Outer screen layer is eliminated the coupling of external electrical field, reduces and disturbs, and before putting cable underground, adorns with the metallic snakeskin pipe.The not direct ground connection of whole acquisition system, the ground insulation of signal process box, harvester, computing machine, protective device and collection terminal.
The monitoring system power supply has the isolating transformer power supply.Effect is not only to realize electrical isolation with civil power, avoids shock pulse in the civil power to the influence of acquisition system, and power-supply system adds power-supply filter and further reduce interference, realizes overvoltage protection.
Other advantage, target and the characteristic of the utility model will be set forth in instructions subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from the practice of the utility model, obtain instruction to investigating of hereinafter.The target of the utility model and other advantage can be passed through following instructions, claims, and the structure that is particularly pointed out in the accompanying drawing realizes and obtains.
Description of drawings
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done further to describe in detail below, wherein:
The power network overvoltage signal detection method process flow diagram that Fig. 1 provides for the utility model embodiment;
The power network overvoltage signal detection system structural representation that Fig. 2 provides for the utility model embodiment.
Embodiment
Below will combine accompanying drawing, the preferred embodiment of the utility model will be carried out detailed description; Should be appreciated that preferred embodiment has been merely explanation the utility model, rather than in order to limit the protection domain of the utility model.
The power network overvoltage signal detection method process flow diagram that Fig. 1 provides for the utility model embodiment; As shown in the figure: the power network overvoltage signal detection method that the utility model provides may further comprise the steps:
S1: capacitive pick-up is connected between electrical network bus and the ground wire,
S2: the low-frequency current sensor is connected between capacitive pick-up and the ground wire, and obtains voltage signal in the electrical network bus,
S3: behind the processes voltage signal and judge whether to surpass predetermined voltage threshold; If the voltage signal amplitude surpasses predetermined voltage threshold, then the trigger pip collecting unit is gathered the voltage signal that transfinites automatically; The processing of said voltage signal and judgement specifically may further comprise the steps:
S31: the current signal that the low-frequency current sensor obtains is input in the active integrating circuit and handles;
S32: the current signal after active integrating circuit is handled is input to and carries out the signal processing and amplifying in first amplifying circuit;
S33: the amplified current signal is input to reconstruct of signal condition waveform and trigger element, converts current signal to voltage signal, and export the trigger pip that transfinites.
Simultaneously, further comprising the steps of:
S21: High Frequency Current Sensor is connected between low frequency High Frequency Current Sensor and the ground wire, and obtains electrical network bus medium-high frequency voltage signal;
S22: the high-frequency current signal that High Frequency Current Sensor is obtained is input in the passive integrator to be handled;
S23: the current signal after passive integrator handled is input to and carries out the signal processing and amplifying in second amplifying circuit;
S24: the amplified current signal is input to reconstruct of signal condition waveform and trigger element; Convert current signal to voltage signal; And judge that whether voltage signal surpasses preset HF voltage threshold value, if the high-frequency voltage signal amplitude surpasses preset HF voltage threshold value, exports the trigger pip that transfinites; Then the trigger pip collecting unit is gathered the high-frequency voltage signal that transfinites automatically.
S4: the overvoltage signal that transmission and preservation are gathered.
The power network overvoltage signal detection system structural representation that Fig. 2 provides for the utility model embodiment; As shown in the figure: the power network overvoltage signal detection system that the utility model provides comprises capacitive pick-up, low-frequency current sensor, active integrating circuit, first amplifying circuit, the reconstruct of signal condition waveform and trigger element, signal gathering unit and data transmission, saved system, High Frequency Current Sensor, passive active integration and second amplifying circuit;
Said capacitive pick-up is connected between electrical network bus and the ground wire;
Be provided with the low-frequency current sensor between said capacitive pick-up and the ground wire;
Said active integrating circuit is connected with the low-frequency current sensor;
Said first amplifying circuit is used to receive the current signal of low-frequency current sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of first amplifying circuit is also exported the trigger pip that transfinites;
Said signal gathering unit is used to gather the voltage signal that transfinites that voltage magnitude surpasses the setting threshold trigger voltage;
Said data transmission and saved system are used to transmit and preserve the overvoltage signal of gathering.
Said High Frequency Current Sensor is connected between low frequency High Frequency Current Sensor and the ground wire;
Said High Frequency Current Sensor is connected with passive active integration;
Said second amplifying circuit is used to receive the current signal of High Frequency Current Sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of second amplifying circuit is also exported the trigger pip that transfinites.
Said cable is the double layer screen cable, said cable head double layer screen ground connection, and terminal outer shielding open circuit, the internal layer shielding connects the signal ground of acquisition system.
The power supply of said signal gathering unit adopts the isolating transformer power supply.
Said capacitive pick-up is the voltage sensor based on the capacitive apparatus leakage current, and said voltage sensor is the capacitive transformer sleeve pipe.
Voltage sensor based on the capacitive apparatus leakage current mainly is made up of capacitive transformer sleeve pipe, current sensor and integrator three parts, and line voltage acts on the condenser-type terminal, then on the bottom shielding of bushing ground wire, produces electric current; No-load voltage ratio through current sensor; Produce output voltage, this output voltage is through behind the integrator, produce one with the linear output voltage of line voltage; This shows; Through measuring the capacitive apparatus leakage current, with integrator this current signal is reconstituted the voltage signal linear with line voltage then, can realize the detection of mains voltage signal.Based on the voltage sensor of this method have volume little, simple in structure, directly be not electrically connected with the electrical network primary equipment, good insulation preformance, do not influence advantage such as electric power netting safe running.
Present embodiment adopts two current sensors of high and low frequency that electric current is carried out segmentation and detects; Wherein the low-frequency current sensor is used for the detection to vagabond current of power-frequency voltage and switching overvoltage effect running casing, and High Frequency Current Sensor is used for the detection of lightning impulse effect running casing to vagabond current in addition.The low frequency small electric current sensor adopts active integral way, and frequency band is 10Hz～5kHz.The big electric current of high frequency adopts passive integral way, and frequency band is 5kHz～2MHz.
Because electric current is widely different under different voltage effects on the sleeve pipe ground wire; Current value range is between 8.5mA～200A; Span reaches 20000 times, and to several MHz, accurately measuring so on a large scale, current signal is the difficult point of the maximum of voltage sensor design to frequency range from several Hz.Present embodiment adopts two current sensors of high and low frequency that electric current is carried out segmentation and detects, and has avoided voltage sensor to be applicable to and has detected the wide shortcoming of range of current.
Cable adopts the double layer screen cable, head end double layer screen ground connection, and terminal outer shielding open circuit, the internal layer shielding connects the signal ground of acquisition system.Outer screen layer is eliminated the coupling of external electrical field, reduces and disturbs, and before putting cable underground, adorns with the metallic snakeskin pipe.The not direct ground connection of whole acquisition system, the ground insulation of signal process box, harvester, computing machine, protective device and collection terminal.
Signal conditioning circuit realization wave impedance coupling and initial partial pressure ratio are consistent with the steady state partial pressure ratio; The output of the trigger pip that will transfinite simultaneously; Its comparative level is decided by the triggering reference quantity that is provided with, and generally it is set to 1.5 times of rated voltages, also can realize the triggering of different voltages through circuit conditioning.
Acquisition system employing vertical resolution is 14 a triple channel high capacity frequency conversion data collecting card, and the highest SF reaches 80MHz.Have preparatory triggering and frequency-change sampling function, trigger the record that function realizes triggering preceding data in advance, the frequency-change sampling function realizes the complete documentation of high speed (equivalent frequency is greater than 1MHz) transient state thunder and lightning waveform and long-time (greater than 5 seconds) internal overvoltage waveform.
The monitoring system start of backstage such as signal gathering unit and data transmission, saved system is operation over-voltage monitoring capture program automatically; In case voltage magnitude surpasses the setting threshold trigger voltage; System gathers automatically; Analyze the superpotential characteristic parameter, triggered time, waveform and characteristic parameter are deposited in the SQL database, and prepare superpotential triggering collection next time automatically.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and the scope of the utility model the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (5)
1. the power network overvoltage signal detection system is characterized in that: comprise capacitive pick-up, low-frequency current sensor, active integrating circuit, first amplifying circuit, the reconstruct of signal condition waveform and trigger element, signal gathering unit and data transmission and saved system;
Said capacitive pick-up is connected between electrical network bus and the ground wire;
Be provided with the low-frequency current sensor between said capacitive pick-up and the ground wire;
Said active integrating circuit is connected with the low-frequency current sensor;
Said first amplifying circuit is used to receive the current signal of low-frequency current sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of first amplifying circuit is also exported the trigger pip that transfinites;
Said signal gathering unit is used to gather the voltage signal that transfinites that voltage magnitude surpasses the setting threshold trigger voltage;
Said data transmission and saved system are used to transmit and preserve the overvoltage signal of gathering.
2. power network overvoltage signal detection system according to claim 1 is characterized in that: also comprise High Frequency Current Sensor, passive active integration and second amplifying circuit;
Said High Frequency Current Sensor is connected between low frequency High Frequency Current Sensor and the ground wire;
Said High Frequency Current Sensor is connected with passive active integration;
Said second amplifying circuit is used to receive the current signal of High Frequency Current Sensor input and current signal is amplified;
Reconstruct of said signal condition waveform and trigger element, the current signal that is used to handle from the output of second amplifying circuit is also exported the trigger pip that transfinites.
3. power network overvoltage signal detection system according to claim 2 is characterized in that: said cable is the double layer screen cable, said cable head double layer screen ground connection, and terminal outer shielding open circuit, the internal layer shielding connects the signal ground of acquisition system.
4. power network overvoltage signal detection system according to claim 3 is characterized in that: the power supply of said signal gathering unit adopts the isolating transformer power supply.
5. power network overvoltage signal detection system according to claim 4 is characterized in that: said capacitive pick-up is the voltage sensor based on the capacitive apparatus leakage current, and said voltage sensor is the capacitive transformer sleeve pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220253128 CN202600034U (en) | 2012-05-31 | 2012-05-31 | Power grid overvoltage signal detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220253128 CN202600034U (en) | 2012-05-31 | 2012-05-31 | Power grid overvoltage signal detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721854A (en) * | 2012-05-31 | 2012-10-10 | 重庆市电力公司綦南供电局 | Method and system for detecting overvoltage signal of power grid |
| CN103278678A (en) * | 2013-05-16 | 2013-09-04 | 广州供电局有限公司 | Lightning overvoltage measuring system |
| CN113848513A (en) * | 2021-09-23 | 2021-12-28 | 全球能源互联网研究院有限公司 | Multifunctional sensor and application method thereof |
-
2012
- 2012-05-31 CN CN 201220253128 patent/CN202600034U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721854A (en) * | 2012-05-31 | 2012-10-10 | 重庆市电力公司綦南供电局 | Method and system for detecting overvoltage signal of power grid |
| CN102721854B (en) * | 2012-05-31 | 2015-08-05 | 重庆市电力公司綦南供电局 | Power network overvoltage signal detection method and system |
| CN103278678A (en) * | 2013-05-16 | 2013-09-04 | 广州供电局有限公司 | Lightning overvoltage measuring system |
| CN113848513A (en) * | 2021-09-23 | 2021-12-28 | 全球能源互联网研究院有限公司 | Multifunctional sensor and application method thereof |
| CN113848513B (en) * | 2021-09-23 | 2024-02-20 | 全球能源互联网研究院有限公司 | Multifunctional sensor and application method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121219 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121219 Address after: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee after: Qinan Power Supply Bureau of Chongqing Power Co. Patentee after: State Grid Corporation of China Address before: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee before: Qinan Power Supply Bureau of Chongqing Power Co. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |