CN107607809A - Voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection - Google Patents
Voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection Download PDFInfo
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- CN107607809A CN107607809A CN201710778186.7A CN201710778186A CN107607809A CN 107607809 A CN107607809 A CN 107607809A CN 201710778186 A CN201710778186 A CN 201710778186A CN 107607809 A CN107607809 A CN 107607809A
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- leakage current
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- 230000001012 protector Effects 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 title claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000011787 zinc oxide Substances 0.000 description 5
- 229960001296 zinc oxide Drugs 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of resistive device of appearance for detecting voltage-limiting surge protector electric current,Including civil power sample circuit,Leakage current sample circuit,Phase-comparison circuit,Display driver circuit and status display circuit,Civil power sample circuit and mains-supplied connection,For being sampled to line voltage,Leakage current sample circuit is connected with surge protector,For being sampled to leakage current voltage,The input of phase-comparison circuit is connected with civil power sample circuit and leakage current sample circuit respectively,For carrying out phase bit comparison to line voltage and leakage current voltage,And obtain output voltage,The input of display driver circuit and the output end of phase-comparison circuit connect,Output end is connected with status display circuit,Status display is carried out for the output voltage of phase-comparison circuit analyze simultaneously driving condition display circuit,It is of the invention can automatic detection voltage-limiting surge protector be resistive and capacity current,So as to monitor the working condition of voltage-limiting surge protector in real time.
Description
Technical field
The present invention relates to a kind of automatic detection voltage-limiting surge protector is resistive and the device of capacity current, belong to thunder and lightning section
Learn technical field.
Background technology
The core devices of voltage-limiting surge protector are Zinc-oxide piezoresistors, and Zinc-oxide piezoresistor is for a long time in line electricity
Under pressure effect, due to the fluctuation of line voltage distribution and the effect of overvoltage, occur deteriorating and aging phenomenon.Zinc-oxide piezoresistor is bad
Change, aging cause electric leakage rheology big, and the current in resistance property for being primarily due to Zinc-oxide piezoresistor becomes big.Current in resistance property becomes big
The reason for be due to the reference voltage of ZnO resistors and caused by insulaion resistance diminishes.Voltage-limiting surge protector leaks electricity
Rheology is big, and the composition of leakage current is mainly current in resistance property, and current in resistance property can cause surge protector to generate heat, and can draw under long term
Cause thermal damage was played, causes the short circuit of supply line, is not normally functioning electric power system, tripping operation, the phenomenon of the failure of power-off occurs,
Fire incident even occurs.
The content of the invention
The present invention is in order to solve problems of the prior art, there is provided it is a kind of can automatic detection voltage-limiting surge protector
Resistive and capacity current, so as to monitor the device of the working condition of voltage-limiting surge protector in real time.
In order to achieve the above object, technical scheme proposed by the present invention is：One kind detection voltage-limiting surge protector is resistive
With the device of capacity current, including civil power sample circuit, leakage current sample circuit, phase-comparison circuit, display driver circuit and
Status display circuit, the civil power sample circuit and mains-supplied connection, for being sampled to line voltage, the leakage
Current sampling circuit is connected with surge protector, for being sampled to the leakage current voltage of surge protector, the phase ratio
Input compared with circuit is connected with civil power sample circuit and leakage current sample circuit respectively, for line voltage and leakage current electricity
Pressure carries out phase bit comparison, and obtains output voltage, the input of the display driver circuit and the output end of phase-comparison circuit
Connection, output end are connected with status display circuit, for the output voltage of phase-comparison circuit analyze simultaneously driving condition
Display circuit carries out status display.
Above-mentioned technical proposal is further designed to：The civil power sample circuit is down-converter.
The leakage current sample circuit includes sample resistance and voltage amplifier, the sample resistance and surge protector string
Connection, the voltage amplifier are connected with sample resistance, and the voltage for leakage current is amplified.
Transient state is parallel with the sample resistance and suppresses diode.
The phase-comparison circuit includes resonance circuit and choke coil, and the resonance circuit exports with leakage current sample circuit
End connection, chokes pipe is connected with civil power sample circuit output end, when leakage current sample circuit output voltage and civil power sample circuit
When output voltage is with phase, phase-comparison circuit output voltage is zero, when the advanced civil power of leakage current sample circuit output voltage phase
During sample circuit output voltage phase, phase-comparison circuit output voltage is negative value.
The display driver circuit includes NAND gate, NOT gate and comparator, the NAND gate and NOT gate series connection, comparator with
The NAND gate and NOT gate being mutually in series are in parallel.
The status display circuit includes capacitive and shows LED and resistive display LED, and capacitive shows that LED exports with comparator
End connection, resistive display LED NAND gates output end connection.
Beneficial effects of the present invention are：
The present invention judge electric current capacitive or it is resistive use two paths of signals phase bit comparison, measurement accuracy height, identify phase height.
And phase-comparison circuit is relatively simple for structure, it is easy to implement.
The strong antijamming capability of the sample circuit of the present invention, suppress diode provided with transient state, can effectively protect rear class electric
The work on road；Voltage amplifier circuit is used in leakage current sample circuit, leakage current voltage can be amplified, measurement accuracy height,
Circuit work is sensitive.
Show that driving and status display circuit use NAND gate, NOT gate and comparator in the present invention, stable working state can
Lean on.
Brief description of the drawings
Fig. 1 is the theory diagram of the embodiment of the present invention.
Fig. 2 is the circuit diagram of sample circuit in Fig. 1.
Fig. 3 is the circuit diagram of phase-comparison circuit in Fig. 1.
Fig. 4 is the circuit diagram of display driver circuit in Fig. 1.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in detail.
Embodiment
A kind of automatic detection voltage-limiting surge protector of the present embodiment is resistive and the theory diagram of capacity current device such as
Shown in Fig. 1, including civil power sample circuit, leakage current sample circuit, phase-comparison circuit, display driver circuit and status display electricity
Road.Civil power sample circuit and mains-supplied connection, leakage current sample circuit are connected with surge protector, phase-comparison circuit
Input be connected respectively with civil power sample circuit and leakage current sample circuit, input and the phase bit comparison of display driver circuit
The output end connection of circuit, output end are connected with status display circuit.Each several part circuit structure design is simple in the present embodiment, work
Make stable performance, its course of work is, by civil power sample circuit and mains-supplied connection, line voltage to be sampled,
Mainly obtain the phase of line voltage；Leakage current sample circuit includes sample resistance and voltage amplifier, and sample resistance is connected
Into voltage-limiting surge protector, the voltage of reflection leakage current is produced on sample resistance, is amplified by voltage amplifier.
Two-way sampling voltage is added to phase-comparison circuit simultaneously, phase bit comparison is carried out to two-way voltage signal, when electric current in sample resistance
For capacity current when, export as negative magnitude of voltage；When electric current is current in resistance property in sample resistance, output voltage is nought state.Phase
The output signal of bit comparison circuit is sent to display driver circuit, for driving condition display circuit to surge protector current state
Shown.
As shown in Fig. 2 the civil power sample circuit in sample circuit is made up of down-converter T, the letter of sampling voltage
Number with the same phase of civil power, output voltage 5V, RnFor voltage-limiting surge protector, R is sample resistance, and value is 10m Ω, RnNormally
During work, distribution capacity is mainly reflected in, distributed capacitance is thousands of pF.Electric current is capacity current in R；Work as RnOccur bad
When change, aging, current in resistance property is mainly reflected in.Transient state is also parallel with sample resistance R and suppresses diode TVS, primarily serves guarantor
The effect of shield, when leakage current is excessive, the overtension at R both ends, prevent the damage for causing rear class amplifying circuit.Sample circuit
Export U1It is civil power sampling voltage signal, U2It is the leakage current sampling voltage signal of voltage-limiting surge protector.
As shown in figure 3, phase-comparison circuit includes L1、C1Form 50Hz the first resonance circuit, L2、C2Form 50Hz's
Second resonance circuit, choke coil L3, R3、 C3The first discharge loop formed, R4、 C4The second discharge loop formed, detection two
Pole pipe D1And D2；First resonance circuit one end and U2Connection, other end ground connection, the first resonance circuit and the second resonance circuit coupling
Connect.Choke coil L3One end is grounded, the other end and U1Connection, its both end voltage is U1Voltage.First discharge loop both ends respectively with
Second resonance circuit one end connects with choke coil earth terminal, the second discharge loop both ends respectively with the second resonance circuit other end and
Choke coil earth terminal connects, detector diode D1And D2It is connected between two discharge loops and the second resonance circuit.Its
Operation principle is：.Work as U2Voltage signal phase and U1When identical, show U2In electric current be current in resistance property, U0Output is zero
State.Work as U2The advanced U of phase of output voltage1Phase when, show U2In electric current be capacity current, U0Output be negative
Magnitude of voltage.
As shown in figure 4, display driver circuit and status display circuit are mainly made up of two parts, current in resistance property driving is aobvious
Show part and capacity current driving display portion, display driver circuit includes NAND gate, NOT gate and comparator, NAND gate and NOT gate
Series connection, comparator are in parallel with the NAND gate and NOT gate that are mutually in series；Status display circuit includes capacitive and shows LED2Show with resistive
Show LED1, LED2It is connected with comparator output terminal, LED1NAND gate output end connects.Its operation principle is to work as u0Output voltage
When being zero, current in resistance property, u are expressed as0By NAND gate, export as high level, then by NOT gate output be low level, LED1It is bright,
It is current in resistance property to show the electric current in voltage-limiting surge protector.As output voltage u0For negative value when, by comparator output be
High level, drive LED2It is bright, it is expressed as capacity current.
The detection voltage-limiting surge protector of the present invention is resistive and capacity current device is not limited to the various embodiments described above, all
The technical scheme obtained using equivalent substitution mode is all fallen within the scope of protection of present invention.
Claims (7)
1. voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection, it is characterised in that：Electricity is sampled including civil power
Road, leakage current sample circuit, phase-comparison circuit, display driver circuit and status display circuit, the civil power sample circuit with
Mains-supplied connection, for being sampled to line voltage, the leakage current sample circuit is connected with surge protector, is used
Be sampled in the leakage current voltage to surge protector, the input of the phase-comparison circuit respectively with civil power sample circuit
Connected with leakage current sample circuit, for carrying out phase bit comparison to line voltage and leakage current voltage, and obtain output voltage, institute
The output end of the input and phase-comparison circuit of stating display driver circuit is connected, and output end is connected with status display circuit, is used
In the output voltage to phase-comparison circuit analyze and driving condition display circuit carries out status display.
2. detecting according to claim 1, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
State civil power sample circuit and use down-converter.
3. detecting according to claim 2, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
Stating leakage current sample circuit includes sample resistance and voltage amplifier, and the sample resistance is connected with surge protector, the electricity
Pressure amplifier is connected with sample resistance, and the voltage for leakage current is amplified.
4. detecting according to claim 3, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
State and transient state suppression diode is parallel with sample resistance.
5. detecting according to claim 3, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
Stating phase-comparison circuit includes resonance circuit and choke coil, and the resonance circuit is connected with leakage current sample circuit output end, gripped
Flow tube is connected with civil power sample circuit output end, when leakage current sample circuit output voltage and civil power sample circuit output voltage are same
Xiang Shi, phase-comparison circuit output voltage are zero, when the advanced civil power sample circuit of leakage current sample circuit output voltage phase is defeated
When going out voltage-phase, phase-comparison circuit output voltage is negative value.
6. detecting according to claim 3, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
Stating display driver circuit includes NAND gate, NOT gate and comparator, the NAND gate and NOT gate series connection, comparator and is mutually in series
NAND gate and NOT gate are in parallel.
7. detecting according to claim 3, voltage-limiting surge protector is resistive and the device of capacity current, it is characterised in that：Institute
Stating status display circuit includes capacitive display LED and resistive display LED, and capacitive shows that LED is connected with comparator output terminal, resistive
Show the connection of LED NAND gates output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710778186.7A CN107607809B (en) | 2017-09-01 | 2017-09-01 | Device for detecting resistive and capacitive currents of voltage limiting type surge protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710778186.7A CN107607809B (en) | 2017-09-01 | 2017-09-01 | Device for detecting resistive and capacitive currents of voltage limiting type surge protector |
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| Publication Number | Publication Date |
|---|---|
| CN107607809A true CN107607809A (en) | 2018-01-19 |
| CN107607809B CN107607809B (en) | 2024-03-12 |
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| CN201710778186.7A Active CN107607809B (en) | 2017-09-01 | 2017-09-01 | Device for detecting resistive and capacitive currents of voltage limiting type surge protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794258A (en) * | 2019-10-28 | 2020-02-14 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
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| CN103969523A (en) * | 2014-04-18 | 2014-08-06 | 南京信息工程大学 | Device capable of automatically monitoring performance of voltage limiting type surge protection device |
| CN104459280A (en) * | 2014-12-19 | 2015-03-25 | 南京信息工程大学 | Method for extracting resistance current of metal oxide arrester (MOA) |
| CN204269746U (en) * | 2014-12-12 | 2015-04-15 | 江苏久创电气科技有限公司 | A kind of MOA lightning arrester on-Line Monitor Device |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN207198258U (en) * | 2017-09-01 | 2018-04-06 | 南京创博电子有限公司 | Voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection |
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2017
- 2017-09-01 CN CN201710778186.7A patent/CN107607809B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| CN102621371A (en) * | 2012-03-22 | 2012-08-01 | 上海市电力公司 | Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method |
| CN102721850A (en) * | 2012-06-08 | 2012-10-10 | 上海市电力公司 | Measuring method for fundamental wave component of resistive current of zinc oxide arrester |
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| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794258A (en) * | 2019-10-28 | 2020-02-14 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
| CN110794258B (en) * | 2019-10-28 | 2022-05-06 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
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| CN107607809B (en) | 2024-03-12 |
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