CN109900985A - The decision-making system and determination method of surge protector degradation - Google Patents
The decision-making system and determination method of surge protector degradation Download PDFInfo
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Abstract
The invention proposes the decision-making systems and determination method of a kind of surge protector degradation, wherein decision-making system includes: for applying alive power supply circuit to the both ends of surge protector；It is set on the PE line of surge protector, for incuding the leakage current of surge protector, and exports the current sensor of first voltage signal；Amplifying circuit, the input terminal of amplifying circuit are connected with the output end of current detection circuit, for amplifying processing to first voltage signal, to export second voltage signal；Determine control circuit, determines that control circuit is used to second voltage signal being converted to corresponding leakage current value, and be compared with nominal varistor leakage current value to leakage current value, the degradation of surge protector is determined according to comparison result.The decision-making system realizes the on-line real time monitoring of surge protector degradation by the monitoring to surge protector leakage current, and by the degradation of leakage current changed to determine surge protector.
Description
Technical field
The present invention relates to the decision-making systems and judgement side of appliance field more particularly to a kind of surge protector degradation
Method.
Background technique
In modern building, especially there is a building of more electronic information equipment, lightning protection measures are needed from building
Unification considers in terms of building object lightning protection and Protection of Electronic Information System form Lightening two.And the effects of lightning master that building electronic information system is subject to
If thunder and lightning is to lightning strike electromagnetic pulse caused by ground discharge, induced overvoltage can be generated by acting on adjoining conductor
With induction overcurrent.Some induced overvoltages even can achieve several kilovolts, they can pass through power supply line, control line or letter
The transmission such as number line and various protection (metal) pipe, slot, bracket and pipelines, is finally loaded on system equipment, to system equipment
It damages.
At present for the protection of lightning strike electromagnetic pulse, using isolation, shielding, filtering and clamper mainly in transmission channel
Method and by the measures such as equipotential bonding, ground connection, by lightning strike electromagnetic pulse and induced overvoltage, induction overcurrent elimination
In the periphery of system equipment, wherein install various types of surge protector (Surge additional in the power-supply system of electronic information
Protection Device, abbreviation SPD) it is exactly a kind of effective safeguard procedures.
Surge protector is a non-linear element, and working principle diagram is as shown in Figure 1.The work of surge protector is depended on
In the size for the voltage U and trigger voltage Up for being applied to its both ends, as U < Up, the resistance value of SPD is very high, only very little
Leakage current passes through；As U >=Up, that is, when the special circumstances such as lightning stroke occur, the resistance value of SPD sharply declines, overvoltage and mistake
Electric current flows into ground terminal by SPD, without flowing into equipment；It is to be restored to U < Up when.SPD shows high resistant resistance again.Cause
This, SPD is widely deployed in low-voltage power supply and distribution systems at different levels, for limiting the overvoltage in distribution system, so that it will not
More than the rated impulse voltage that various electrical equipments and power distribution equipment are resistant to, to protect equipment from damage caused by thunder and lightning
Evil.
However, in the long-term use, the core elements such as varistor in SPD are due to bearing various external influences
(electric, hot, mechanical effect or its synergy), may result in deterioration, the aging of SPD performance, and then cause to leak electricity
Stream increase and safeguard function fail, when serious can generating device explosion, it is on fire, to cause accident, cause damages.Therefore, and
When detect the SPD of reduced performance or damage, to preventing from the generation of accident, reduce loss to have very important significance.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of decision-making system of surge protector degradation, by
The both ends SPD apply fixed voltage, and acquire the leakage current of SPD, and leakage current value is compared with nominal varistor leakage current value
The on-line real time monitoring to SPD degradation is realized in judgement, so as to find to deteriorate problem in time existing for SPD, eliminates electricity
Security risk that may be present in Force system or equipment.
It is another object of the present invention to propose a kind of determination method of surge protector degradation.
In order to arrive above-mentioned purpose, first aspect present invention embodiment proposes a kind of judgement of surge protector degradation
System.The system includes: power supply circuit, and the power supply circuit is used to apply voltage to the both ends of the surge protector；Electric current
Sensor, the current sensor are set on the PE line of the surge protector, for incuding the leakage of the surge protector
Electric current, and export first voltage signal；Amplifying circuit, the output of the input terminal of the amplifying circuit and the current detection circuit
End is connected, and the amplifying circuit is for amplifying processing to the first voltage signal, to export second voltage signal；Determine
Control circuit, the input terminal for determining control circuit are connected with the output end of the amplifying circuit, the judgement control circuit
For the second voltage signal to be converted to corresponding leakage current value, and to the leakage current value and nominal varistor leakage current value
It is compared, the degradation of the surge protector is determined according to comparison result.
The decision-making system of the surge protector degradation of the embodiment of the present invention, by applying fixed voltage at the both ends SPD,
And the leakage current of SPD is acquired, and leakage current value is compared judgement with nominal varistor leakage current value, it realizes and journey is deteriorated to SPD
The on-line real time monitoring of degree, so as to find to deteriorate problem in time existing for SPD, eliminating may be deposited in electric system or equipment
Security risk.
In order to achieve the above object, second aspect of the present invention embodiment proposes a kind of judgement of surge protector degradation
Method, comprising the following steps:
Apply voltage to the both ends of the surge protector；Pass through the electric current being set on the PE line of the surge protector
Sensor detects the leakage current of the surge protector, to export first voltage signal；The first voltage signal is put
Big processing, to export second voltage signal；The second voltage signal is converted into corresponding leakage current value；To the leakage current
Value is compared with nominal varistor leakage current value, and the degradation of the surge protector is determined according to comparison result.
The determination method of the surge protector degradation of the embodiment of the present invention, by applying fixed voltage at the both ends SPD,
And the leakage current of SPD is acquired, and leakage current value is compared judgement with nominal varistor leakage current value, it realizes and journey is deteriorated to SPD
The on-line real time monitoring of degree, so as to find to deteriorate problem in time existing for SPD, eliminating may be deposited in electric system or equipment
Security risk.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is a kind of working principle diagram of surge protector；
Fig. 2 is the structural schematic diagram of the decision-making system of the surge protector degradation of the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram for power supply circuit that the embodiment of the present invention proposes；
Fig. 4 is a kind of structural schematic diagram for amplifying circuit that the embodiment of the present invention proposes；
Fig. 5 is the flow diagram of the determination method of the surge protector degradation of one embodiment of the invention；
Fig. 6 is the flow diagram of the determination method of the surge protector degradation of another embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Describe with reference to the accompanying drawings the surge protector degradation proposed according to embodiments of the present invention decision-making system and
Determination method.
Fig. 2 is the structural schematic diagram of the decision-making system of the surge protector degradation of the embodiment of the present invention.Such as Fig. 2 institute
Show, the decision-making system of surge protector degradation includes: power supply circuit 10, current sensor 11, amplifying circuit 12 and determines
Control circuit 13.
Wherein, with reference to Fig. 1, power supply circuit 10 is used to apply voltage to the both ends of surge protector.
Current sensor 11 is connected with amplifying circuit 12, and current sensor 11 is set on the PE line of surge protector, uses
First voltage signal is exported in the leakage current of induction surge protector, and to amplifying circuit 12.Wherein, the PE line of SPD picks out, and wears
After the toroidal inductive circle of over-current sensor 11, then it is incorporated in ground wire.
The input terminal of amplifying circuit 12 is connected with the output end of current sensor 11, and amplifying circuit 12 is used for first voltage
Signal amplifies processing, to export second voltage signal.
Determine that the input terminal of control circuit 13 is connected with the output end of amplifying circuit 12, judgement control circuit 13 is for by the
Two voltage signals are converted to corresponding leakage current value, and are compared to leakage current value with nominal varistor leakage current value, according to than
Compared with the degradation of result judgement surge protector.
It specifically, include metal oxide varistor (Metal Oxide Varistor, abbreviation MOV) in SPD,
MOV is nonlinear wind vibration resistance device, is mainly used for carrying out voltage clamping when circuit is by over-voltage, absorbs extra electricity
Stream is to protect Sensitive Apparatus.But with the deterioration of varistor, nonlinear characteristic is deteriorated, dies down to releasing for overvoltage, leaks
Current value also becomes larger therewith.The case where present invention acts on lower SPD leakage current value by analysis fixed voltage, indirectly to SPD, especially
It is that the deterioration condition of varistor in SPD is judged.
Therefore, after determining that control circuit 13 receives the second voltage signal of the sending of amplifying circuit 12, determine control electricity
Road 13 the corresponding SPD leakage current value of second voltage signal, and the electric leakage that will be acquired are acquired according to preset ratiometric conversion formula
Flow valuve is compared with nominal varistor leakage current value.
Wherein, when leakage current value is greater than nominal varistor leakage current value, judgement SPD performance deterioration；Be less than when leakage current value or
Person is equal to nominal varistor leakage current value, determines that surge protector performance is normal.
Further, when leakage current value is greater than nominal varistor leakage current value, i.e. the judgement a degree of deterioration of SPD performance
When, the degree of SPD performance deterioration is further obtained in order to facilitate detection personnel, determines that control circuit 13 can also calculate leakage current value
The deterioration journey of surge protector is determined when difference is less than the first difference threshold with the difference between nominal varistor leakage current value
Degree is in the first estate, is more than or equal to the first difference threshold in difference and when less than the second difference threshold, determines that surge is protected
The degradation of shield device is in the second grade, when difference is more than or equal to the second preset difference value, determines surge protector
Degradation is in the tertiary gradient.Wherein, the second grade be higher than the first estate, the tertiary gradient be higher than the second grade, i.e., second etc.
The SPD degradation of grade is more serious compared with the SPD degradation of the first estate, and the SPD degradation of the tertiary gradient is compared with the second grade
SPD degradation it is more serious, SPD easily high fever is on fire in the case of the tertiary gradient, causes damages.Meanwhile above-mentioned first
Difference threshold, the second difference threshold and third difference threshold can be obtained by experimental data, for fixed preset value, are stored in and sentenced
Determine in control circuit 13.
Optionally, the decision-making system of surge protector degradation can also include early warning circuit, the early warning circuit with sentence
Determine control circuit 13 to be connected, wherein determine that control circuit 13 can control early warning circuit according to the locating grade of degradation and issue
Corresponding warning information.It should be appreciated that the higher grade of degradation, the rank of warning information is also higher.
Fig. 3 is a kind of structural schematic diagram for power supply circuit that the embodiment of the present invention proposes.As shown in figure 3, power supply circuit 10
Including power supply 101 and pressure unit 102.
Referring to Fig. 3, power supply 101 provides the first supply voltage；The input terminal and power supply 101 of pressure unit 102
It is connected, the output end of pressure unit 102 is connected with the feeder ear of surge protector, and pressure unit is for mentioning power supply 101
The first supply voltage supplied carries out decompression processing, to export the both ends that the second supply voltage is applied to surge protector.The decompression
The setting of unit 102, can avoid the both ends SPD, to apply voltage value excessive, causes the excessive pressure damages of SPD, can also protect and SPD
Associated amplifying circuit 12 and judgement control circuit 13, to protect it from excessive pressure damages.
Optionally, in the actual operation process, it can use the first power supply electricity that pressure unit 102 provides power supply
Pressure carries out decompression processing according to a certain percentage, and the voltage for being applied to the both ends SPD is finally made to become the micro voltage within the scope of 0-1V.
Further, as shown in figure 3, the power supply circuit 10 that the embodiment of the present invention proposes may also include voltage detection unit
103, to monitor the output voltage of power supply 101.
Referring to Fig. 3, determines that control circuit 13 is also connected with pressure unit 102 and voltage detection unit 103 respectively, determine control
Circuit 13 processed can also control pressure unit 102 according to output voltage, determine control circuit 13 according to voltage detection unit
The output voltage of the power supply 101 of 103 acquisitions, reasonably selects decompression ratio, controls pressure unit according to decompression ratio
102, so that pressure unit 102 exports the second supply voltage, realizes to the both ends SPD and apply micro voltage.
Fig. 4 is a kind of structural schematic diagram for amplifying circuit that the embodiment of the present invention proposes.As shown in figure 3, amplifying circuit 12
It include: the first operational amplifier 121, second operational amplifier 122 and third operational amplifier 123.
Referring to Fig. 4, the negative input end of the first operational amplifier 121 is connected with the negative output terminal of current sensor 11, and first
The output end of operational amplifier 121 is connected by first resistor R1 with the positive input terminal of the first operational amplifier 121；Second operation
The positive input terminal of amplifier 122 is connected with the positive output end of current sensor 11, and the output end of second operational amplifier 122 passes through
Second resistance R2 is connected with the negative input end of second operational amplifier 122, and the negative input end of second operational amplifier 122 also passes through
3rd resistor R3 is connected with the positive input terminal of the first operational amplifier 121, wherein the resistance value of second resistance R2 and first resistor R1
It is equal；The negative input end of third operational amplifier 123 passes through the output end phase of the 4th resistance R4 and the first operational amplifier 121
Even, the positive input terminal of third operational amplifier 123 is connected by the 5th resistance R5 with the output end of second operational amplifier 122,
The output end of third operational amplifier 123 is connected by the 6th resistance R6 with the negative input end of third operational amplifier 123, third
The positive input terminal of operational amplifier 123 also passes through the 7th resistance R7 ground connection, wherein the resistance value of the 4th resistance R4 and the 5th resistance R5
Equal, the 6th resistance R6 is equal with the resistance value of the 7th resistance R7.By the setting of amplifying circuit 12, realize to current sensor
The amplification of the first voltage signal of 11 outputs, thus solves the problems, such as the too small bring measurement accuracy of the leakage current order of magnitude.
Wherein, 12 both ends input voltage differential signal (i.e. first voltage signal) of amplifying circuit, due in amplifying circuit 12
First resistor R1 it is equal with second resistance R2 resistance value, the 4th resistance R4 is equal with the resistance value of the 5th resistance R5, the 6th resistance R6
It is equal with the resistance value of the 7th resistance R7, the relationship between the input signal and output signal of amplifying circuit 12 can be obtained:
From the above equation, we can see that the gain of amplifying circuit 12 is related with resistance R1, R3, R4 and R6, wherein R3 can be variable resistance
Device can realize the change of 12 gain of amplifying circuit by the resistance value of change 3rd resistor R3 when the resistance value of R1, R4 and R6 are fixed
Change.
In conclusion the decision-making system for the surge protector degradation that the embodiment of the present invention proposes, by the both ends SPD
Apply fixed voltage, and acquires the leakage current of SPD, and leakage current value is compared judgement with nominal varistor leakage current value, it is real
Electric system now is eliminated so as to find to deteriorate problem in time existing for SPD to the on-line real time monitoring of SPD degradation
Or security risk that may be present in equipment.
In order to realize above-described embodiment, the present invention proposes a kind of determination method of surge protector degradation.
Fig. 5 is a kind of flow diagram of the determination method for surge protector degradation that the embodiment of the present invention proposes.
As shown in figure 5, the determination method of surge protector degradation the following steps are included:
S101 applies voltage to the both ends of surge protector.
S102 detects the leakage current of surge protector by the current sensor being set on the PE line of surge protector,
To export first voltage signal.
S103 amplifies processing to first voltage signal, to export second voltage signal.
Second voltage signal is converted to corresponding leakage current value by S104.
S105 is compared leakage current value with nominal varistor leakage current value, determines surge protector according to comparison result
Degradation.
Wherein, the deterioration journey of surge protector is determined according to the comparison result of leakage current value and nominal varistor leakage current value
Degree, comprising:
When leakage current value is greater than nominal varistor leakage current value, the deterioration of surge protector performance is determined；And in leakage current
When value is less than or equal to nominal varistor leakage current value, determine that surge protector performance is normal.
Fig. 6 is the flow diagram of the determination method of the surge protector degradation of another embodiment of the present invention.Such as
Shown in Fig. 6, the determination method of surge protector degradation is further comprising the steps of:
S106 calculates leakage current value and nominal varistor leakage current value when leakage current value is greater than nominal varistor leakage current value
Between difference.
S107 determines that the degradation of surge protector is in the first estate when difference is less than the first difference threshold,
Difference is more than or equal to the first difference threshold and when less than the second difference threshold, determines that the degradation of surge protector is in
Second grade determines that the degradation of surge protector is in third etc. when difference is more than or equal to the second preset difference value
Grade, wherein the second grade is higher than the first estate, and the tertiary gradient is higher than the second grade.
The determination method for the surge protector degradation that the embodiment of the present invention proposes is fixed by applying at the both ends SPD
Voltage, and the leakage current of SPD is acquired, and leakage current value is compared judgement with nominal varistor leakage current value, it realizes bad to SPD
The on-line real time monitoring of change degree, so as to find to deteriorate problem in time existing for SPD, eliminating can in electric system or equipment
Security risk existing for energy.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of decision-making system of surge protector degradation characterized by comprising
Power supply circuit, the power supply circuit are used to apply voltage to the both ends of the surge protector；
Current sensor, the current sensor are set on the PE line of the surge protector, are protected for incuding the surge
The leakage current of device is protected, and exports first voltage signal；
Amplifying circuit, the input terminal of the amplifying circuit are connected with the output end of the current detection circuit, the amplifying circuit
For amplifying processing to the first voltage signal, to export second voltage signal；
Determine control circuit, the input terminal for determining control circuit is connected with the output end of the amplifying circuit, the judgement
Control circuit is used to the second voltage signal being converted to corresponding leakage current value, and to the leakage current value and nominal varistor
Leakage current value is compared, and the degradation of the surge protector is determined according to comparison result.
2. the decision-making system of surge protector degradation as described in claim 1, which is characterized in that the power supply circuit packet
It includes:
Power supply, the power supply is for providing the first supply voltage；
Pressure unit, the input terminal of the pressure unit are connected with the power supply, the output end of the pressure unit and institute
The feeder ear for stating surge protector is connected, and the pressure unit is for carrying out decompression processing to first supply voltage, with defeated
The second supply voltage is applied to the both ends of the surge protector out.
3. the decision-making system of surge protector degradation as claimed in claim 2, which is characterized in that the power supply circuit is also
Include:
Voltage detection unit, the voltage detection unit are used to detect the output voltage of the power supply；
Wherein, the judgement control circuit is also connected with the pressure unit and the voltage detection unit respectively, the judgement
Control circuit is also used to control the pressure unit according to the output voltage, so that described in pressure unit output
Second supply voltage.
4. the decision-making system of surge protector degradation as described in claim 1, which is characterized in that the amplifying circuit packet
It includes:
First operational amplifier, the negative output terminal phase of the negative input end and the current sensor of first operational amplifier
Even, the output end of first operational amplifier is connected by first resistor with the positive input terminal of first operational amplifier；
Second operational amplifier, the positive output end phase of the positive input terminal of the second operational amplifier and the current sensor
Even, the output end of the second operational amplifier is connected by second resistance with the negative input end of the second operational amplifier,
The negative input end of the second operational amplifier also passes through 3rd resistor and is connected with the positive input terminal of first operational amplifier,
Wherein, the second resistance is equal with the resistance value of the first resistor；
The negative input end of third operational amplifier, the third operational amplifier passes through the 4th resistance and first operation amplifier
The output end of device is connected, and the positive input terminal of the third operational amplifier passes through the 5th resistance and the second operational amplifier
Output end is connected, and the output end of the third operational amplifier passes through the negative input of the 6th resistance and the third operational amplifier
End be connected, the positive input terminal of the third operational amplifier also passes through the 7th resistance eutral grounding, wherein the 4th resistance with it is described
The resistance value of 5th resistance is equal, and the 6th resistance is equal with the resistance value of the 7th resistance.
5. the decision-making system of surge protector degradation as described in claim 1, which is characterized in that the judgement control electricity
Road is specifically used for:
When the leakage current value is greater than the nominal varistor leakage current value, the surge protector performance deterioration is determined；And
When the leakage current value is less than or equal to the nominal varistor leakage current value, the surge protector performance is being determined just
Often.
6. the decision-making system of surge protector degradation as claimed in claim 5, which is characterized in that the judgement control electricity
Road is also used to:
When the leakage current value is greater than the nominal varistor leakage current value, calculates the leakage current value and the nominal varistor leaks
Difference between current value；And
When the difference is less than the first difference threshold, determine that the degradation of the surge protector is in the first estate,
The difference is more than or equal to first difference threshold and when less than the second difference threshold, determines the surge protector
Degradation is in the second grade, when the difference is more than or equal to second preset difference value, determines that the surge is protected
The degradation of shield device is in the tertiary gradient, wherein second grade is higher than described the first estate, and the tertiary gradient is higher than
Second grade.
7. the decision-making system of surge protector degradation as claimed in claim 3, which is characterized in that the second power supply electricity
The value of pressure is 0~1V.
8. a kind of determination method of surge protector degradation, which comprises the following steps:
Apply voltage to the both ends of the surge protector；
The leakage current of the surge protector is detected by the current sensor being set on the PE line of the surge protector, with
Export first voltage signal；
Processing is amplified to the first voltage signal, to export second voltage signal；
The second voltage signal is converted into corresponding leakage current value；
The leakage current value is compared with nominal varistor leakage current value, the surge protector is determined according to comparison result
Degradation.
9. the determination method of surge protector degradation as claimed in claim 8, which is characterized in that it is described according to compare knot
Fruit determines the degradation of the surge protector, comprising:
When the leakage current value is greater than the nominal varistor leakage current value, the surge protector performance deterioration is determined；And
When the leakage current value is less than or equal to the nominal varistor leakage current value, determine that the surge protector performance is normal.
10. the determination method of surge protector degradation as claimed in claim 9, which is characterized in that further include:
When the leakage current value is greater than the nominal varistor leakage current value, calculates the leakage current value and the nominal varistor leaks
Difference between current value；And
When the difference is less than the first difference threshold, determine that the degradation of the surge protector is in the first estate,
The difference is more than or equal to first difference threshold and when less than the second difference threshold, determines the surge protector
Degradation is in the second grade, when the difference is more than or equal to second preset difference value, determines that the surge is protected
The degradation of shield device is in the tertiary gradient, wherein second grade is higher than described the first estate, and the tertiary gradient is higher than
Second grade.
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| CN114188918A (en) * | 2021-12-07 | 2022-03-15 | 长沙润迅通信设备有限公司 | SPD degradation intelligent monitoring protection device and method |
| CN116256623A (en) * | 2023-05-15 | 2023-06-13 | 成都爱旗科技有限公司 | Chip electrical characteristic analysis system and method based on volt-ampere characteristic curve |
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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 |
| CN104267305A (en) * | 2014-09-25 | 2015-01-07 | 深圳市科威电子测试有限公司 | Method and system for judging deterioration degree of surge protective device (SPD) |
| KR20180054330A (en) * | 2016-11-15 | 2018-05-24 | 한국전기연구원 | Test device for Surge protective device |
| CN206259701U (en) * | 2016-12-07 | 2017-06-16 | 四川中光防雷科技股份有限公司 | A kind of intelligent surge protector |
| CN208459476U (en) * | 2018-07-26 | 2019-02-01 | 云南电网有限责任公司曲靖供电局 | Current in resistance property detection device and arrester checks system |
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| CN114188918A (en) * | 2021-12-07 | 2022-03-15 | 长沙润迅通信设备有限公司 | SPD degradation intelligent monitoring protection device and method |
| CN116256623A (en) * | 2023-05-15 | 2023-06-13 | 成都爱旗科技有限公司 | Chip electrical characteristic analysis system and method based on volt-ampere characteristic curve |
| CN116256623B (en) * | 2023-05-15 | 2023-08-08 | 成都爱旗科技有限公司 | Chip electrical characteristic analysis system and method based on volt-ampere characteristic curve |
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