CN201359621Y - Sensor for detecting transient voltage to ground signal - Google Patents
Sensor for detecting transient voltage to ground signal Download PDFInfo
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- CN201359621Y CN201359621Y CNU2009201368301U CN200920136830U CN201359621Y CN 201359621 Y CN201359621 Y CN 201359621Y CN U2009201368301 U CNU2009201368301 U CN U2009201368301U CN 200920136830 U CN200920136830 U CN 200920136830U CN 201359621 Y CN201359621 Y CN 201359621Y
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Abstract
The utility model relates to a sensor for detecting transient voltage to ground signal, which comprises a sensing head, a signal conditioning circuit and a sensor power supply; the sensing head comprises a metal sensor body which is externally wrapped with a sensor insulating layer and led out by an outgoing line; the signal conditioning circuit comprises a voltage clamping circuit, a detection transforming circuit and a detection amplifying circuit; the voltage clamping circuit is used for limiting the magnitude of a signal detected by the sensing head within a certain voltage range; the detection transforming circuit is used for transforming the signal detected by the sensing head from a high-frequency current signal to a high-frequency voltage signal, and simultaneously, a band-pass filter filters the detected signal so as to obtain the signal of a certain frequency band; the detection amplifying circuit comprises an operational amplifier for amplifying the detected signal and a detection circuit for detecting the detected signal, and outputs the signal; and the sensor can be generally used for detection on transient voltage to ground signal for local discharge of electric appliances, has simple structure and reliable detection data.
Description
Technical field
The utility model relates to the sensor that detects transient state voltage-to-ground signal.
Background technology
A kind of electrical equipment certainly exists electricity, heat, the chemical insulation degradation that forms under the unusual condition that reaches in long-time running, cause electric insulation intensity to reduce, even break down.Mostly many burst accidents in distribution are due to the apparatus insulated problem in recent years.Experience both domestic and external shows that the local discharge characteristic of live line measurement electrical equipment is a kind of good method of prevention electrical equipment malfunction.
Shelf depreciation generally releases energy with following form:
(1) electromagnetic form: radiowave, light, heat;
(2) sound wave form: sound, ultrasound wave;
(3) gas form: ozone, nitrous oxide.
Wherein, the electromagnetic wave that shelf depreciation produces is by electrical equipment, blazes abroad as the seam crossing of the metal cabinet of switch cubicle or the liner of gas-insulated switch, produces a transient voltage simultaneously, and the metal cabinet outside surface by equipment goes down with passing to.These potential pulses are at first to be found by Dr John Reeves in 1974, and its called after transient state voltage-to-ground (TEV).
Measure instantaneous voltage-to-ground pulse (TEV) signal that operating electrical equipment produces in the shelf depreciation process, thereby the operation conditions of determining apparatus, it is a kind of method of testing of maturation, application experience is for many years arranged abroad, this method is that external Utilities Electric Co. extensively adopts, respond well, it can provide strong technique guarantee for the repair based on condition of component of equipment.
The utility model content
The utility model purpose is to provide the sensor of a kind of detection transient state voltage-to-ground (TEV) signal, and this sensor uses as the peripherals of checkout equipment, can generally be used for the detection of the shelf depreciation of electrical equipment.
A kind of sensor that detects transient state voltage-to-ground signal mainly comprises sensing head, signal conditioning circuit and probe power;
Described sensing head comprises the sensor main body of a metal, and it is coated with the sensor insulation course, and draws with coaxial shielding signal extension line;
Described signal conditioning circuit mainly comprises the voltage clamp circuit, detects translation circuit and detector amplifier; This voltage clamp circuit is used for the size of signal that sensing head detects is limited within the certain voltage scope; This detection translation circuit is used for changing signal that sensing head detects into high-frequency voltage signal by high-frequency current signal, by bandpass filter detection signal is carried out filtering simultaneously, to obtain the signal of certain frequency section; Comprise operational amplifier that carries out the detection signal amplification and the detecting circuit that carries out the detection signal detection in this detector amplifier, and output signal;
Described probe power provides working power.
The utility model can generally be used for the detection of the transient state voltage-to-ground signal of local discharge of electrical equipment, and is simple in structure, and it is reliable to detect data.
Description of drawings
Fig. 1 is the structural representation of sensing head of the present utility model;
Fig. 2 structural representation of the present utility model.
The utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment
Shown in Fig. 1 and 2, the utility model mainly comprises sensing head 1, signal conditioning circuit 2, probe power 3, described sensing head 1 comprises the sensor main body 11 of a metal, it is coated with the sensor insulation course 12 that insulating material is made, and draws with coaxial shielding cable (signal extension line) 13; The effect one of this sensor insulation course 12 is to serve as insulating material, the 2nd, sensor main body 11 is played protection, supporting role;
Described signal conditioning circuit 2 mainly comprises voltage clamp circuit 21, detects translation circuit 22 and detector amplifier 23; This voltage clamp circuit 21 is used for the size of sensing head 1 signal that detects is limited within the certain voltage scope; This detection translation circuit 22 is used for changing sensing head 1 signal that detects into high-frequency voltage signal by high-frequency current signal, by bandpass filter detection signal is carried out filtering simultaneously, to obtain the signal of certain frequency section; Use operational amplifier to carry out the amplification of detection signal in this detector amplifier 23, carry out the detection of detection signal simultaneously by detecting circuit, and the signal after the output conditioning is given signal acquisition circuit 7;
Described probe power 3 provides working power.
Because in signal conditioning circuit 2, each chip that uses all needs to provide correspondent voltage to carry out work, so needing probe power 3 powers, consider the request for utilization of equipment, adopt rechargeable battery, the user can charge to battery by charger and guarantee that the utility model normally uses.
During measurement, the utility model is conflicted on switch cubicle metal cabinet 4 surfaces, the metal cabinet 4 that should expose can be regarded a pole plate of plate condenser as, and 1 of sensing head of the present utility model can be regarded another pole plate of plate condenser as, and middle filling material then is a sensor insulation course 12.
When discharge source 6 occurring on the electrified body 5, electric charge is moved to metal cabinet 4 fast by electrified body 5, thereby causes the variation of metal cabinet 4 surface charges.After electric charge arrives metal cabinet 4, can propagate to earth point rapidly, concrete speed is relevant with the manufactured materials of cabinet, generally can think to be exactly the light velocity.For the plate condenser that constitutes by metal sales counter 4, sensor insulation course 12 and sensor main body 11, the charge variation that metal cabinet 4 surfaces occur can induce the charge variation of same quantity on sensor main body 11, form certain high frequency induction current.This high-frequency current is input to signal conditioning circuit 2 through signal extension line 13, then can generate the HF voltage that is directly proportional with strength of discharge.Detect this HF voltage, then can correspondingly draw the parameter such as strength of discharge, frequency of switch cubicle.
Claims (1)
1, a kind of sensor that detects transient state voltage-to-ground signal is characterized in that: mainly comprise sensing head, signal conditioning circuit, probe power;
Described sensing head comprises the sensor main body of a metal, and it is coated with the sensor insulation course, and draws with coaxial shielding signal extension line;
Described signal conditioning circuit mainly comprises the voltage clamp circuit, detects translation circuit and detector amplifier; This voltage clamp circuit is used for the size of signal that sensing head detects is limited within the certain voltage scope; This detection translation circuit is used for changing signal that sensing head detects into high-frequency voltage signal by high-frequency current signal, by bandpass filter detection signal is carried out filtering simultaneously, to obtain the signal of certain frequency section; Comprise operational amplifier that carries out the detection signal amplification and the detecting circuit that carries out the detection signal detection in this detector amplifier, and output signal;
Described probe power provides working power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201368301U CN201359621Y (en) | 2009-02-20 | 2009-02-20 | Sensor for detecting transient voltage to ground signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201368301U CN201359621Y (en) | 2009-02-20 | 2009-02-20 | Sensor for detecting transient voltage to ground signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201359621Y true CN201359621Y (en) | 2009-12-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201368301U Expired - Fee Related CN201359621Y (en) | 2009-02-20 | 2009-02-20 | Sensor for detecting transient voltage to ground signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201359621Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508128A (en) * | 2011-10-24 | 2012-06-20 | 天津大学 | Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network |
| CN102749561A (en) * | 2012-07-10 | 2012-10-24 | 广州安电测控技术有限公司 | Cloud service-based partial discharge transient-stage earth electric wave cloud detection method and device |
| CN101718538B (en) * | 2009-12-14 | 2012-11-14 | 钢铁研究总院 | Signal receiving and amplifying device of electromagnetic ultrasonic thickness measuring instrument |
| CN102928745A (en) * | 2012-10-08 | 2013-02-13 | 华北电力大学 | Wide-band gain-adjustable medium inductive sensor for detecting partial discharge of switch cabinet |
| CN103207306A (en) * | 2013-03-11 | 2013-07-17 | 广东电网公司电力科学研究院 | Partial discharge transient earth voltage sensor |
| CN103217633A (en) * | 2013-03-28 | 2013-07-24 | 国家电网公司 | Sensor for detecting local discharge of high-voltage switch cabinet |
-
2009
- 2009-02-20 CN CNU2009201368301U patent/CN201359621Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718538B (en) * | 2009-12-14 | 2012-11-14 | 钢铁研究总院 | Signal receiving and amplifying device of electromagnetic ultrasonic thickness measuring instrument |
| CN102508128A (en) * | 2011-10-24 | 2012-06-20 | 天津大学 | Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network |
| CN102749561A (en) * | 2012-07-10 | 2012-10-24 | 广州安电测控技术有限公司 | Cloud service-based partial discharge transient-stage earth electric wave cloud detection method and device |
| CN102928745A (en) * | 2012-10-08 | 2013-02-13 | 华北电力大学 | Wide-band gain-adjustable medium inductive sensor for detecting partial discharge of switch cabinet |
| CN103207306A (en) * | 2013-03-11 | 2013-07-17 | 广东电网公司电力科学研究院 | Partial discharge transient earth voltage sensor |
| CN103217633A (en) * | 2013-03-28 | 2013-07-24 | 国家电网公司 | Sensor for detecting local discharge of high-voltage switch cabinet |
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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: 20091209 Termination date: 20170220 |