CN104215901A - High voltage circuit breaker arc contact fault diagnosis method - Google Patents
High voltage circuit breaker arc contact fault diagnosis method Download PDFInfo
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- CN104215901A CN104215901A CN201410502854.XA CN201410502854A CN104215901A CN 104215901 A CN104215901 A CN 104215901A CN 201410502854 A CN201410502854 A CN 201410502854A CN 104215901 A CN104215901 A CN 104215901A
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Abstract
The invention discloses a high voltage circuit breaker arc contact fault diagnosis method which includes the following steps: initializing reference characteristic quantity; acquiring a dynamic resistance-stroke curve of a high voltage circuit breaker arc contact to be diagnosed and acquiring the area enclosed by the curve in the tripping process arc contact contacting stage as characteristic quantity to be diagnosed; comparing the characteristic quantity to be diagnosed with the preset reference characteristic quantity, diagnosing the state of the high voltage circuit breaker arc contact according to a comparison result and outputting a diagnosis result. Due to the fact that the area enclosed by the dynamic resistance-stroke curve in the tripping process arc contact contacting stage is utilized as the characteristic quantity to be diagnosed, the burning state and the contacting position of the arc contact correspond to each other, the burning degree of the circuit breaker arc contact can be diagnosed accurately and visually, and the method provides a basis for evaluation of the state of a circuit breaker arc extinguish chamber and making of circuit breaker overhauling decision. The method has the advantages of being high in diagnosis accuracy and high in detection speed, facilitating detection, not requiring disassembly of a high voltage circuit breaker to be diagnosed and saving manpower and material resources.
Description
Technical field
The present invention relates to primary cut-out fault detection technique, be specifically related to a kind of primary cut-out arcing contact method for diagnosing faults, the method is for being judged by the degree of electrical arc erosion, to diagnose primary cut-out arcing contact whether to reach defect state to primary cut-out arcing contact.
Background technology
Primary cut-out is to ensure the of paramount importance control and protection equipment of power network safety operation, and its quantity in electrical network is huge and structure is very complicated.Contact of breaker is composed in parallel by main contact and arcing contact, and because arcing contact is longer than main contact, isolating switch separates in main contact after arcing contact in separating brake process.Arcing contact separates between rear dynamic and static arcing contact because electric field action produces electric arc.When isolating switch cut-offs load or short-circuit current at every turn, the electric arc of generation all can cause scaling loss to arcing contact, and arcing contact scaling loss can directly have influence on connecting-disconnecting function and the electric life of isolating switch, and visible arc contact state has vital impact to isolating switch performance.
At present domesticly the detection method of contact of breaker state is normally measured to its loop resistance, i.e. contact Static Contact resistance, the Static Contact state of key reaction isolating switch main contact.In recent years, domestic to isolating switch dynamic resistance, measurement has started to carry out research to a certain degree, and isolating switch dynamic resistance can react the dynamic Contact state of arcing contact.But, the main integrated test instrument field of research of isolating switch dynamic resistance at present, evaluation method research for test result there is not yet, therefore to research isolating switch arcing contact method for evaluating state, isolating switch dynamic Contact state is diagnosed to important in inhibiting.
Summary of the invention
The technical problem to be solved in the present invention is: for isolating switch in the time cut-offfing short-circuit current, the situation that isolating switch arcing contact electrical arc erosion causes the ability of dropout current to decline, provides that a kind of diagnosis accuracy is high, detection speed is fast, the primary cut-out arcing contact method for diagnosing faults that fast, does not need to dismantle primary cut-out to be diagnosed, saves manpower and material resources easy to detect.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of primary cut-out arcing contact method for diagnosing faults, comprises the steps:
1) initialization arranges fixed reference feature amount;
2) obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, stroke, the mapping relations of contact between contact resistance corresponding to the trip position that described dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed; Obtain described dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area as characteristic quantity to be diagnosed, described separating brake process arcing contact contact phase refers to that main contact starts to be separated into the distinct time zone of arcing contact;
3) described in general, characteristic quantity to be diagnosed and preset reference characteristic quantity compare, and according to comparative result, diagnostic result is diagnosed and exported to the malfunction of primary cut-out arcing contact.
Preferably, described step 2) in obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed detailed step comprise:
2.1) on primary cut-out to be diagnosed, be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
2.2) apply DC experiment current excitation to primary cut-out to be diagnosed, and control primary cut-out to be diagnosed and carry out on/off switch action, current signal and the voltage signal of the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, primary cut-out to be diagnosed;
2.3) angular velocity signal of each sampling instant is converted to the stroke of primary cut-out to be diagnosed, calculate the contact resistance of this sampling instant primary cut-out to be diagnosed according to the current signal of each sampling instant and voltage signal, according to the stroke of primary cut-out to be diagnosed corresponding to each sampling instant, the contact resistance of primary cut-out to be diagnosed generates the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, the stroke that described dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed, the mapping relations of contact between contact resistance corresponding to the trip position.
Preferably, described step 2) in obtain described dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area specifically refer to: in extracting described dynamic resistance-stroke curve, main contact starts to be separated into the sub-curve of the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in described sub-curve, obtain the area that described dynamic resistance-stroke curve surrounds at separating brake process arcing contact contact phase.
Preferably, the detailed step of described step 1) comprises:
1.1) with the reference primary cut-out of primary cut-out same model to be diagnosed on be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
1.2) to apply DC experiment current excitation with reference to primary cut-out, and control and carry out on/off switch action with reference to primary cut-out, the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, with reference to current signal and the voltage signal of primary cut-out;
1.3) angular velocity signal of each sampling instant is converted to the stroke with reference to primary cut-out, calculate the contact resistance of this sampling instant with reference to primary cut-out according to the current signal of each sampling instant and voltage signal, according to the stroke of reference primary cut-out corresponding to each sampling instant, with reference to dynamic resistance-stroke reference curve of the contact resistance generating reference primary cut-out arcing contact of primary cut-out, described dynamic resistance-stroke reference curve comprises the stroke with reference to High Voltage Circuit Breaker Contacts action, the mapping relations of contact between contact resistance corresponding to the trip position,
1.4) extract main contact in described dynamic resistance-stroke reference curve and start to be separated into the sub-curve of the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in described sub-curve, obtain the area that described dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase, the area initialization that described dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase is set to fixed reference feature amount.
Preferably, the detailed step of described step 3) comprises:
3.1) difference between characteristic quantity to be diagnosed, preset reference characteristic quantity described in calculating, whether the ratio that judges described difference and preset reference characteristic quantity exceedes default normal range value, if do not exceed normal range value, judge that the arcing contact of primary cut-out to be diagnosed is normal; Otherwise, redirect execution step 3.2);
3.2) whether the ratio that judges described difference and preset reference characteristic quantity is less than Fisrt fault diagnostic value, if be less than Fisrt fault diagnostic value, judges that the arcing contact of primary cut-out to be diagnosed need to be strengthened monitoring, otherwise redirect execution step 3.3);
3.3) whether the ratio that judges described difference and preset reference characteristic quantity is less than the second fault diagnosis value, if be less than the second fault diagnosis value, the arcing contact of judging primary cut-out to be diagnosed needs to repair, otherwise judges that the arcing contact of primary cut-out to be diagnosed needs to change.
Preferably, described normal range value is 0, and described Fisrt fault diagnostic value is 10%, and described the second fault diagnosis value is 30%.
Primary cut-out arcing contact method for diagnosing faults of the present invention has following advantage:
1, primary cut-out arcing contact method for diagnosing faults of the present invention is for the situation that causes the ability of dropout current to decline wait the primary cut-out of diagnosing arcing contact electrical arc erosion in the time cut-offfing short-circuit current, because contact in the making process of primary cut-out to be diagnosed vibrates excessive, will inevitably cover the actual value of contact resistance, the present invention is by obtaining the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, the area that dynamic resistance-stroke curve is surrounded at separating brake process arcing contact contact phase compares as characteristic quantity to be diagnosed and preset reference characteristic quantity, by the arcing contact scaling loss state of primary cut-out, arcing contact contact position (stroke) is mapped, can overcome the inaccurate problem of actual value of contact resistance, can accurate and visual diagnosis go out isolating switch arcing contact and be subject to the degree of scaling loss, provide foundation for evaluating arc-extinguishing chamber of circuit breaker state and formulating overhaul of line breaker decision-making, there is diagnosis accuracy high, detection speed is fast, advantage efficiently easy to detect.
2, primary cut-out arcing contact method for diagnosing faults of the present invention can directly diagnose to judge arc-extinguishing chamber of circuit breaker scaling loss state for the primary cut-out to be diagnosed of installing on station, do not need to dismantle primary cut-out to be diagnosed, save a large amount of manpowers and material resources.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the basic step of the embodiment of the present invention.
Fig. 2 is the dynamic resistance-stroke curve obtaining in the embodiment of the present invention.
Fig. 3 is the schematic flow sheet that embodiment of the present invention step 3) comprises step.
Embodiment
As shown in Figure 1, the present embodiment primary cut-out arcing contact method for diagnosing faults, comprises the steps:
1) initialization arranges fixed reference feature amount;
2) obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, stroke, the mapping relations of contact between contact resistance corresponding to the trip position that dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed; Obtain dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area as characteristic quantity to be diagnosed, separating brake process arcing contact contact phase refers to that main contact starts to be separated into the distinct time zone of arcing contact;
3) will characteristic quantity be diagnosed and preset reference characteristic quantity compare, according to comparative result, diagnostic result is diagnosed and exported to the malfunction of primary cut-out arcing contact.
The present embodiment by using dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area as characteristic quantity to be diagnosed, the stroke that dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed, the mapping relations of contact between contact resistance corresponding to the trip position, dynamic resistance-stroke curve can reflect the contact resistance corresponding to each contact position of process and contact of contact action in separating brake process, from dynamic resistance curve, calculate arcing contact stage encirclement area the standard value range using this as arcing contact normal condition, dynamic resistance of high-voltage circuit breaker curve arcing contact surrounds area, the disconnected characteristic quantity of follow-up and preset reference characteristic quantity compare the most at last, according to comparative result, diagnostic result is diagnosed and exported to the malfunction of primary cut-out arcing contact, maintenance decision is diagnosed and provided to the scaling loss situation of being convenient to the primary cut-out arcing contact for the treatment of diagnosis.As shown in Figure 2, wherein x axle " contact travel " represents the stroke of contact action to dynamic resistance-stroke curve that the present embodiment obtains, and unit is mm; Y axle is that contact is in contact resistance value corresponding to the trip position, unit is μ Ω, wherein the position of 7.5mm stroke is that main contact starts separately, the position of 25mm stroke is that arcing contact separates completely, and the area that therefore the present embodiment surrounds this dynamic resistance-stroke curve between 7.5mm stroke～25mm stroke is as characteristic quantity to be diagnosed.Because contact vibration in the making process of primary cut-out to be diagnosed is excessive, will inevitably cover the actual value of contact resistance, and the present embodiment obtains area that dynamic resistance-stroke curve surrounds in separating brake process as characteristic quantity to be diagnosed, the inaccurate problem of actual value that can overcome contact resistance, has advantages of that degree of accuracy is high.
In the present embodiment, the detailed step of step 1) comprises:
1.1) with the reference primary cut-out of primary cut-out same model to be diagnosed on be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
1.2) to apply DC experiment current excitation with reference to primary cut-out, and control and carry out on/off switch action with reference to primary cut-out, the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, with reference to current signal and the voltage signal of primary cut-out;
1.3) angular velocity signal of each sampling instant is converted to the stroke with reference to primary cut-out, calculate the contact resistance of this sampling instant with reference to primary cut-out according to the current signal of each sampling instant and voltage signal, according to the stroke of reference primary cut-out corresponding to each sampling instant, with reference to dynamic resistance-stroke reference curve of the contact resistance generating reference primary cut-out arcing contact of primary cut-out, dynamic resistance-stroke reference curve comprises the stroke with reference to High Voltage Circuit Breaker Contacts action, the mapping relations of contact between contact resistance corresponding to the trip position,
1.4) extract main contact in dynamic resistance-stroke reference curve and start to be separated into the sub-curve of the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in sub-curve, obtain the area that dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase, the area initialization that described dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase is set to fixed reference feature amount.
When the present embodiment generates dynamic resistance-stroke reference curve, need to use Dynamic Resistance Tester, large-capacity battery, angular-rate sensor.Wherein, large-capacity battery is used for to apply DC experiment current excitation with reference to primary cut-out, large-capacity battery is for providing a larger DC experiment electric current with reference to primary cut-out, angular-rate sensor is used for obtaining the angular velocity signal with reference to primary cut-out, Dynamic Resistance Tester control is carried out on/off switch action with reference to primary cut-out, and by speed and electric current, voltage signal and triplicity is carried out to computational analysis, dynamic resistance-the stroke curve of the separating brake process obtaining, before burble point, being main contact contact phase, is arcing contact contact phase after burble point.Separating brake process is that main contact starts to be separated into the distinct process of arcing contact, and it is the integral area of arcing contact contact phase resistance to stroke that arcing contact surrounds area.
In the present embodiment, step 2) in obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed detailed step comprise:
2.1) on primary cut-out to be diagnosed, be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
2.2) apply DC experiment current excitation to primary cut-out to be diagnosed, and control primary cut-out to be diagnosed and carry out on/off switch action, current signal and the voltage signal of the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, primary cut-out to be diagnosed;
2.3) angular velocity signal of each sampling instant is converted to the stroke of primary cut-out to be diagnosed, calculate the contact resistance of this sampling instant primary cut-out to be diagnosed according to the current signal of each sampling instant and voltage signal, according to the stroke of primary cut-out to be diagnosed corresponding to each sampling instant, the contact resistance of primary cut-out to be diagnosed generates the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, the stroke that dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed, the mapping relations of contact between contact resistance corresponding to the trip position.
It is identical with aforementioned generation dynamic resistance-stroke reference curve that the present embodiment generates dynamic resistance-stroke curve, equally also needs to use Dynamic Resistance Tester, large-capacity battery, angular-rate sensor, do not repeat them here.Difference is that the target of generation dynamic resistance-stroke curve is primary cut-out to be diagnosed, the target that generates dynamic resistance-stroke reference curve is with reference to primary cut-out, be the primary cut-out of primary cut-out same model brand-new and to be diagnosed with reference to primary cut-out, thereby the primary cut-out that can treat diagnosis provide accurately reference data reliably.
In the present embodiment, step 2) in obtain the area that dynamic resistance-stroke curve surrounds at separating brake process arcing contact contact phase and specifically refer to: the sub-curve that extracts main contact in dynamic resistance-stroke curve and start to be separated into the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in sub-curve, obtain the area that dynamic resistance-stroke curve surrounds at separating brake process arcing contact contact phase.By utilizing one dimension interpolation and trapezoidal integration function in MATLAB software to calculate the area that dynamic resistance-stroke curve surrounds in separating brake process, data in input MATLAB are discrete point (coordinate points) value extracting from dynamic resistance-stroke curve, have advantages of that computing velocity is fast, easy to use.
As shown in Figure 3, the detailed step of step 3) comprises:
3.1) calculate the difference between characteristic quantity to be diagnosed, preset reference characteristic quantity, whether the ratio that judges difference and preset reference characteristic quantity exceedes default normal range value, if do not exceed normal range value, judge that the arcing contact of primary cut-out to be diagnosed is normal; Otherwise, redirect execution step 3.2);
3.2) whether the ratio that judges difference and preset reference characteristic quantity is less than Fisrt fault diagnostic value, if be less than Fisrt fault diagnostic value, judges that the arcing contact of primary cut-out to be diagnosed need to be strengthened monitoring, otherwise redirect execution step 3.3);
3.3) whether the ratio that judges difference and preset reference characteristic quantity is less than the second fault diagnosis value, if be less than the second fault diagnosis value, the arcing contact of judging primary cut-out to be diagnosed needs to repair, otherwise judges that the arcing contact of primary cut-out to be diagnosed needs to change.
As shown in Figure 3, in the present embodiment, normal range value is 0, and Fisrt fault diagnostic value is that 10%, the second fault diagnosis value is 30%.Therefore, according to step 3.1)～3.3), the present embodiment can be divided between following diagnostic region:
[100%, 0]: the arcing contact of primary cut-out is in normal condition.
(0,10%]: the arcing contact of primary cut-out, in general state, needs to strengthen monitoring.
(10%, 30%]: the arcing contact of primary cut-out, in abnormality, needs to repair.
(30%, ∞): the arcing contact of primary cut-out, in seriously burning state, needs to change.
Based between above-mentioned diagnostic region, can realize the Precise Diagnosis of the primary cut-out for the treatment of diagnosis, use the present embodiment primary cut-out arcing contact method for diagnosing faults to try out by the primary cut-out sample to multiple different faults, the present embodiment has higher degree of accuracy, respond well, easy to use, can reach designing requirement completely.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a primary cut-out arcing contact method for diagnosing faults, is characterized in that comprising the steps:
1) initialization arranges fixed reference feature amount;
2) obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, stroke, the mapping relations of contact between contact resistance corresponding to the trip position that described dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed; Obtain described dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area as characteristic quantity to be diagnosed, described separating brake process arcing contact contact phase refers to that main contact starts to be separated into the distinct time zone of arcing contact;
3) described in general, characteristic quantity to be diagnosed and preset reference characteristic quantity compare, and according to comparative result, diagnostic result is diagnosed and exported to the malfunction of primary cut-out arcing contact.
2. primary cut-out arcing contact method for diagnosing faults according to claim 1, is characterized in that described step 2) in obtain the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed detailed step comprise:
2.1) on primary cut-out to be diagnosed, be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
2.2) apply DC experiment current excitation to primary cut-out to be diagnosed, and control primary cut-out to be diagnosed and carry out on/off switch action, current signal and the voltage signal of the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, primary cut-out to be diagnosed;
2.3) angular velocity signal of each sampling instant is converted to the stroke of primary cut-out to be diagnosed, calculate the contact resistance of this sampling instant primary cut-out to be diagnosed according to the current signal of each sampling instant and voltage signal, according to the stroke of primary cut-out to be diagnosed corresponding to each sampling instant, the contact resistance of primary cut-out to be diagnosed generates the dynamic resistance-stroke curve of primary cut-out arcing contact to be diagnosed, the stroke that described dynamic resistance-stroke curve comprises High Voltage Circuit Breaker Contacts action to be diagnosed, the mapping relations of contact between contact resistance corresponding to the trip position.
3. primary cut-out arcing contact method for diagnosing faults according to claim 2, it is characterized in that, described step 2) in obtain described dynamic resistance-stroke curve separating brake process arcing contact contact phase surround area specifically refer to: in extracting described dynamic resistance-stroke curve, main contact starts to be separated into the sub-curve of the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in described sub-curve, obtain described dynamic resistance-stroke curve area that arcing contact contact phase surrounds in separating brake process.
4. primary cut-out arcing contact method for diagnosing faults according to claim 3, is characterized in that, the detailed step of described step 1) comprises:
1.1) with the reference primary cut-out of primary cut-out same model to be diagnosed on be fixed for detecting the angular-rate sensor of moving arcing contact connecting rod rotating shaft rotational angle;
1.2) to apply DC experiment current excitation with reference to primary cut-out, and control and carry out on/off switch action with reference to primary cut-out, the angular velocity signal of the angular-rate sensor of sampling in on/off switch course of action by Dynamic Resistance Tester output, with reference to current signal and the voltage signal of primary cut-out;
1.3) angular velocity signal of each sampling instant is converted to the stroke with reference to primary cut-out, calculate the contact resistance of this sampling instant with reference to primary cut-out according to the current signal of each sampling instant and voltage signal, according to the stroke of reference primary cut-out corresponding to each sampling instant, with reference to dynamic resistance-stroke reference curve of the contact resistance generating reference primary cut-out arcing contact of primary cut-out, described dynamic resistance-stroke reference curve comprises the stroke with reference to High Voltage Circuit Breaker Contacts action, the mapping relations of contact between contact resistance corresponding to the trip position,
1.4) extract main contact in described dynamic resistance-stroke reference curve and start to be separated into the sub-curve of the distinct process of arcing contact, adopt one dimension interpolation and trapezoidal integration function in MATLAB software to calculate each coordinate points in described sub-curve, obtain the area that described dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase, the area initialization that described dynamic resistance-stroke reference curve surrounds at separating brake process arcing contact contact phase is set to fixed reference feature amount.
5. according to the primary cut-out arcing contact method for diagnosing faults described in any one in claim 1～4, it is characterized in that, the detailed step of described step 3) comprises:
3.1) difference between characteristic quantity to be diagnosed, preset reference characteristic quantity described in calculating, whether the ratio that judges described difference and preset reference characteristic quantity exceedes default normal range value, if do not exceed normal range value, judge that the arcing contact of primary cut-out to be diagnosed is normal; Otherwise, redirect execution step 3.2);
3.2) whether the ratio that judges described difference and preset reference characteristic quantity is less than Fisrt fault diagnostic value, if be less than Fisrt fault diagnostic value, judges that the arcing contact of primary cut-out to be diagnosed need to be strengthened monitoring, otherwise redirect execution step 3.3);
3.3) whether the ratio that judges described difference and preset reference characteristic quantity is less than the second fault diagnosis value, if be less than the second fault diagnosis value, the arcing contact of judging primary cut-out to be diagnosed needs to repair, otherwise judges that the arcing contact of primary cut-out to be diagnosed needs to change.
6. primary cut-out arcing contact method for diagnosing faults according to claim 5, is characterized in that: described normal range value is 0, described Fisrt fault diagnostic value is 10%, and described the second fault diagnosis value is 30%.
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