CN103884930A - Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring - Google Patents

Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring Download PDF

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Publication number
CN103884930A
CN103884930A CN201410076825.1A CN201410076825A CN103884930A CN 103884930 A CN103884930 A CN 103884930A CN 201410076825 A CN201410076825 A CN 201410076825A CN 103884930 A CN103884930 A CN 103884930A
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imd
resistance
rectifier
insulation
insulation resistance
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CN103884930B (en
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王金全
李乾
叶小松
邢鸣
徐晔
赵锦成
胡亚超
李建科
侯朋飞
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Army Engineering University of PLA
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Jiangsu Zhenan Power Equipment Co Ltd
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Abstract

The invention provides a full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring. Insulation resistance Rt of a system under normal operation conditions is measured first; the positive electrode and the negative electrode of an IMD injecting source based on a direct current injection method are connected with a neutral line and the ground respectively, and a system insulation monitoring value Rf when IMD forward injection is carried out is obtained through measurement; the direction of IMD injection signals is changed, the positive electrode and the negative electrode of the IMD injecting source are connected with the ground and the neutral line respectively, and the insulation monitoring value Rr when the IMD reverse injection is carried out can be measured; if the Rf or the Rr is not equal to the Rt, the system enters a fault diagnosis process, the real insulation resistance Rm of the system is calculated by using the collected Rf and the Rr, the Rm is then compared with the insulation resistance Rt under the normal operation conditions of the system, and whether the changing of the insulation resistance is caused by fault of a rectifier is obtained.

Description

Not control rectifier method for diagnosing faults of a kind of full-bridge based on insulating monitoring
Technical field
The present invention relates in a kind of IT distribution system the not method for diagnosing faults of control rectifier, be specifically related to not control rectifier method for diagnosing faults of a kind of full-bridge based on insulating monitoring.
Background technology
The fault of rectifier mainly refers to that the diode in rectifier bridge breaks down.The reasons such as diode self reverse breakdown or the insulation course of brachium pontis are destroyed, can cause diode to be short-circuited, and cause that electric current raises fast, conduction voltage drop falls suddenly, when serious, by damage equipment, make systemic breakdown; When occurring the situations such as the bad or overcurrent of diode wiring burns, can cause diode to open a way, may cause that other diode electric currents are out-of-limit, output dc voltage ripple becomes large, affect the normal operation of equipment; These are the modal fault of rectifier and harm.
Under normal circumstances, the formation of rectifier fault is a continuous deteriorated process, shows on the conduction voltage drop of diode, in the time that conduction voltage drop raises or is reduced to certain limit value, open circuit or the short trouble of diode occurs.So, if can, at fault early period of origination, when the rectifier of fault does not also cause significant damage, find in time fault, the probability that can reduce to have an accident, and can provide convenience for the maintenance work of system.Have for the main method of diagnosing rectifier fault both at home and abroad at present: 1. Zymography; 2. direct Detection Method; 3. dictionary library diagnostic method; 4. expert system method; 5. the method such as neural network failure diagnosis.
Zymography is that the time-domain signal of fault is extracted, and conventionally adopt Fourier to change fault time-domain signal is changed in frequency domain and analyzed, but the method is not considered diode deteriorated process gradually, and only with diode, directly open circuit and short circuit are analyzed; Direct Detection Method is by the detection voltage at diode two ends or the electric current of rectifying bridge arm judges whether diode breaks down, but the method needs more voltage-current sensor, virtually increase cost and the complicacy of system, caused system possibly for the fault of sensor is paid larger cost; Dictionary library diagnostic method need to carry out a large amount of numerical simulations and obtain fault value and eigenwert with experiment, is difficult to realize in real system; Expert system method and Neural Network Fault Diagnosis Method are all the methods with strong reckoning ability and human simulation ability, but its training sample is difficult for obtaining, diagnosis capability is strong, the network weight form of expression is fuzzy etc., shortcoming causes the practical ranges of this method limited.
The application of IT system need to rely on insulation monitoring and warning device (IMD), its fundamental purpose be the earth fault for the first time to occurring in system monitor concurrently speak, light reports to the police; If it is deteriorated to utilize the IMD of IT system installing itself to carry out monitor diode fault, just can there is extreme fault (short trouble, open fault) before at rectifier, rectifier is safeguarded, reach remove a hidden danger, accident prevention occur object and without additional surveying instrument instrument.Particularly, for small-sized, lower powered rectifier, the scope that indicates fault diode has little significance, because low power diodes low cost, rectifier bridge produce modular, diode is not dismantled and necessity of changing; Once but there is diode short circuit or open fault in it, the harm bringing wants high more than the cost of rectifier, so in IT system category, if the IMD that energy utilization itself carries carrys out tracing trouble rectifier, remind maintainer to process in time rectifier, can, for the maintenance work of rectifier offers convenience, also be of great significance for the security and the quality of power supply that guarantee whole system.
Summary of the invention
The object of the invention is, propose a kind of rectifier method for diagnosing faults based on insulating monitoring.Utilize the IMD of IT system installing itself to carry out monitor diode fault deterioration process, there is extreme fault (short trouble, open fault) before at rectifier, rectifier is safeguarded, reach remove a hidden danger, accident prevention occur object and without additional surveying instrument instrument.The IMD that utilization itself carries carrys out tracing trouble rectifier, reminds maintainer to process in time rectifier, can offer convenience for the maintenance work of rectifier, is also of great significance for the security and the quality of power supply that guarantee whole system.
Technical scheme of the present invention is: not control rectifier method for diagnosing faults of a kind of full-bridge based on insulating monitoring, and concrete steps are as follows:
A), measure the insulation resistance R under system normal operation t;
B) both positive and negative polarity that, insulation monitoring and warning device IMD based on DC injection method is injected to source respectively with IT system band full-bridge not the neutral line of controlled rectifier circuit be connected with the earth, in whole path, DC side is served as " excitation power supply " role, AC serves as " load " role, for DC side, AC can equivalence be a direct current resistance network, and from the equivalent DC network port of AC, the effect of bearing a direct voltage source is thought in equivalence;
DC impedance equivalent network after simplification is specific as follows: comprise that IMD injects source voltage U s, sampling resistor R s, interference source voltage U c, interference source equivalent internal resistance R c, alternating current circuit equivalent insulation resistance R over the ground; R sone end signal is connected to R and R c, an end signal is connected to U sone end, U sother end ground connection; R mono-end signal is connected to R sand R c, one end ground connection; R cone end signal is connected to R and R s, an end signal is connected to U cpositive terminal, U cthe sub-ground connection of negative terminals;
C), utilize IMD forward Injection Signal, i.e. IMD injection source voltage U spositive terminal and sampling resistor R ssignal connects, negative terminals ground connection, and the measured insulation resistance obtaining is designated as R f; Concrete steps are as follows:
Utilize superposition principle, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R f = U s I s - I c - R s - - - ( 1 )
D), utilize the direction of IMD inverse injection signal, IMD injects source voltage U snegative terminals and sampling resistor R ssignal connects, positive terminal ground connection, and the measured insulation resistance obtaining is designated as R r; Concrete steps are as follows:
Utilize superposition principle, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R r = U s I s + I c - R s - - - ( 2 )
E), simultaneous formula (1) and formula (2), the real insulating resistance value R of the system that obtains m:
R m = U s I s - R s = 2 1 R f + R s + 1 R r + R s - R s - - - ( 2 )
F), rectifier method for diagnosing faults in system, concrete steps are as follows:
1) monitor value of insulation monitoring and warning device IMD changes;
2) if the R measuring in step c) fwith the R measuring in step a) tthe R measuring in unequal or step d) rwith the R measuring in step a) tunequal, judge now system existing problems;
3) by the insulation resistance actual value R measuring in step e) mwith the R measuring in step a) trelatively, if R m=R t, be diagnosed as rectifier in system and break down.
Further, the system described in step f) existing problems comprise that rectifier breaks down, the insulation resistance of system itself changes or Installed System Memory at external dc interference source
Further, in step f), if R m≠ R t, the insulation resistance that is diagnosed as system itself change or Installed System Memory at external dc interference source.
In system, rectifier fault diagnosis principle is as follows: when system is normally moved, it is naked fault in system, and while there is not external dc interference source in system, rectifier DC side line road insulation against ground resistance sizes equates, the factor that affects mid point voltage-to-ground only has each brachium pontis supply voltage, and each brachium pontis supply voltage size is only relevant with the forward voltage of rectifying bridge arm diode, so, in the time there is unbalanced phenomenon in mid point voltage-to-ground, DC current after rectification is injected the earth by DC line insulation against ground resistance, and scurry into AC neutral point, insulating monitoring to IMD impacts, the detected value of insulation monitoring and warning device IMD changes, being diagnosed as rectifier in system breaks down.
First this kind of rectifier method for diagnosing faults need the insulating resistance value under measuring system normal operation, as reference value, gather the insulating resistance value measuring when IMD is positive and negative to be injected for twice, obtain after treatment the actual value of required system insulating resistance, compare with the reference value measuring under system normal operation, draw the reason that IMD monitor value changes.
The invention has the beneficial effects as follows: the insulation-monitoring function of the IMD that employing IT system carries carrys out the rectifier fault in diagnostic system, diagnose rectifier fault by the thinking based on insulating monitoring of the present invention, can occur when deteriorated at diode, while also not forming short circuit or open fault, find fault, and principle is simple, workable, mainly by following features:
1) thus the method applied in the present invention has avoided the device of additional rectifier fault diagnosis to increase the possibility of complicacy of system, and can Precise Diagnosis fault.
2) the present invention can diagnose out rectifier fault deterioration process, reminds in time maintainer that rectifier is keeped in repair, changed, in case there is the harm that the extreme fault of rectifier (short trouble, open circuit fault) is brought to system.
3) the present invention is directed to the complicated deficiency with not diagnosing switching tube deterioration process of existing rectifier method for diagnosing faults, by analysis, first determine and affect the reason that IMD monitor value changes, it is the reason that causes IMD monitor value to change that the insulation that obtains rectifier bridge diode and cable declines.Insulation resistance monitor value while gathering respectively IMD forward and inverse injection, through processing, the real insulating resistance value of the system that obtains, when insulation resistance actual value and reference value are when inconsistent, is diagnosed as rectifier fault.
4) for small-sized, lower powered rectifier, the scope that indicates fault diode has little significance, because low power diodes low cost, rectifier bridge produce modular, diode is not dismantled and necessity of changing; Once but there is diode short circuit or open fault in it, the harm bringing wants high more than the cost of rectifier, so the IMD that utilization of the present invention carries itself carrys out tracing trouble rectifier, remind maintainer to process in time rectifier, can, for the maintenance work of rectifier offers convenience, also be of great significance for the security and the quality of power supply that guarantee whole system.
Accompanying drawing explanation
Fig. 1 is not controlled rectifier circuit figure of IT system band three-phase bridge;
Fig. 2 is not control rectifier simplification circuit model of system band three-phase bridge;
Fig. 3 is that mid-point voltage is with common cathode diode turn-on voltage variation curve map;
Fig. 4 is that mid-point voltage is with common anode utmost point diode turn-on voltage variation curve map;
When Fig. 5 is the injection of IMD forward, mid-point voltage affects IMD insulating monitoring simplified electrical circuit diagram;
When Fig. 6 is IMD inverse injection, mid-point voltage affects IMD insulating monitoring simplified electrical circuit diagram;
Fig. 7 is the schematic diagram that calculates insulation resistance.
Embodiment
As shown in Figure 1, for the not circuit diagram of control rectifier of IT system band three-phase bridge, according to control rectifier switch function not, common cathode or common anode utmost point diode be respectively conducting successively in one-period, and the conducting dutycycle of each diode is three/one-period, utilizes this characteristic, three diodes of common cathode can be equivalent to a diode, co-anode diode is also equivalent to a diode, also three-phase supply can be done to equivalence in upper and lower two brachium pontis simultaneously, is respectively E p, E n, finally by R h, R +, R -three resistance that triangle connects, by △-Y conversion, become by R p, R n, R lthe resistance that the Y type of composition connects.
As shown in Figure 2, D ufor equivalent common cathode diode, D dfor equivalent co-anode diode, in figure, each equivalent resistance and equivalent source are respectively: R n=R hr -/ (R h+ R ++ R -), R p=R hr +/ (R h+ R ++ R -), R l=R -r +/ (R h+ R ++ R -), E p=max{E a, E b, E c, E n=min{E a, E b, E c.Adopt cyclic current method to analyze circuit model shown in Fig. 2, obtain mid-point voltage U m=i 0r l, as long as U mbe not 0, have the DC current of scurrying into neutral point, below it is calculated:
- E p - E n + i 0 · R p + i 1 ( R p + R n ) = 0 - E p + i 0 ( R p + R l + R g ) + i 1 · R p = 0 - - - ( 1 )
Cancellation i 1, obtain i 0, then by i 0be brought into mid-point voltage expression formula, obtain
U m = i 0 R l = R n · E p - R p · E n R p R n + ( R p + R n ) ( R l + R g ) · R l - - - ( 2 )
In general, rectifier DC side line road insulation against ground resistance sizes equates, i.e. R p=R n, affect U mfactor only have E pwith E n, by E pwith E nexpression formula known, its size only with the forward voltage U of rectifying bridge arm diode frelevant.In MATLAB/Simulink simulation software, set up the not circuit model of control rectifier of IT system band three-phase bridge, get three-phase voltage and be respectively E a=220 0 ° of ∠, E b=220 ∠-120 °, E c=220 120 ° of ∠, diode forward forward voltage is 0.8V, and C is 3000 μ F, R hbe 10 Ω, R +, R -be respectively 20M Ω, 20M Ω, R gfor 100k Ω.Dummy diode conducting situation is to U mimpact.Other conditions are constant, only change D 1pipe U fvalue, is changed to 1.1V by 0.5V, and step-length is 0.05V, records U msituation of change, as shown in Figure 3; Only change D 6pipe U fvalue, is changed to 1.1V by 0.5V, and step-length is 0.05V, records U msituation of change, as shown in Figure 4.
As mid-point voltage U moccur after unbalanced phenomenon, DC current after rectification is injected the earth by DC line insulation against ground resistance, and scurry into AC neutral point, insulating monitoring to IMD impacts, and in whole path, DC side has been served as " excitation power supply " role, AC serves as " load " role, and AC can equivalence be a direct current resistance network for DC side, from the equivalent DC network port of AC, can think the effect of bearing a direct voltage source.According to IMD principle and mid-point voltage U mthe mechanism of action whole system can be reduced to direct current resistance equivalent network as illustrated in Figures 5 and 6, wherein, U sfor IMD injects source voltage, R sfor sampling resistor, U cfor interference source voltage, R cfor interference source equivalent internal resistance, R is alternating current circuit equivalent insulation resistance over the ground.
Utilize the insulation monitoring and warning device of IT system itself to diagnose rectifier fault.Be designated as R according to the measured insulation resistance obtaining of direction (forward) of the IMD Injection Signal shown in Fig. 5 f, mainly utilize superposition principle, as shown in Figure 7, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R f = U s I s - I c - R s - - - ( 3 )
Change the signal injection direction of IMD, the direct current signal shown in Fig. 5 is injected to power supply U sboth positive and negative polarity reversal connection, upper negative under just (oppositely), as shown in Figure 6, record insulating resistance value now, be designated as R r, utilize superposition principle, as shown in Figure 7, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R r = U s I s 2 + I c 2 - R s - - - ( 4 )
Simultaneous formula (3) and formula (4), the real insulating resistance value R of the system that can obtain:
R m = U s I s - R s = 2 1 R f + R s + 1 R r + R s - R s - - - ( 5 )
From formula (3) (4) (5), if only utilize IMD to inject forward or backwards the measured insulation resistance that obtains of signal one time, possibly cannot get rid of the impact of interference, be that IMD is when measuring insulation resistance and changing, may be because the insulation resistance of system itself changes, may be also that Installed System Memory is at direct current interference source.Analysis based on alignment voltage is known, and when imbalance appears in central point source voltage-to-ground, it can produce and disturb IMD as " DC source of energization ", and the diode of rectifier bridge is the unique factor that affects mid-point voltage.In general in system, there is not external dc interference source, so, if can get rid of former because the insulation resistance of system itself changes that IMD insulating monitoring changes, can be diagnosed as rectifier fault.
For different systems, corresponding insulating resistance value difference under normal operation, so need scene to measure the safe insulation resistance of system, is taken as R t(being generally 20-80k Ω), if the R measuring for R rwith R tunequal, think that now generation systems insulation changes or has rectifier fault, system enters diagnostic process, by R rand R fbe brought into insulation resistance and calculate formula (5), obtain system insulating resistance actual value R m, relatively R mwith R tif, R m≠ R t, be diagnosed as the insulation resistance of system own and occurred variation (raise or decline), can take corresponding measure to system; If R m=R t, be diagnosed as rectifier in system and break down.
Rectifier fault diagnosis scheme based on insulating monitoring, for diagnosing the situation that in IT system, rectifier diodes forward voltage changes, according to rectifier fault diagnosis thinking provided by the invention, utilize the insulation-monitoring function of IMD itself to extract the fault special medical treatment of rectifier fault, rectifier break down or the process that fault is deteriorated in, can diagnose rapidly, facilitate system maintenance.
The present invention program's key has been to analyze the reason that IMD measured value changes, and design error failure feature extraction scheme, has got rid of the situation of the IMD measurement variation being caused by system insulation decline itself, thereby has judged rectifier fault.
The present invention discloses as above with preferred embodiment, and so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on claims person of defining.

Claims (3)

1. a not control rectifier method for diagnosing faults of the full-bridge based on insulating monitoring, is characterized in that: concrete steps are as follows:
A), measure the insulation resistance R under system normal operation t;
B) positive and negative electrode that, insulation monitoring and warning device IMD based on DC injection method is injected to source respectively with IT system band full-bridge not the neutral line of controlled rectifier circuit be connected with the earth, in whole path, DC side is served as " excitation power supply " role, AC serves as " load " role, for DC side driving source, AC can equivalence be a direct current resistance network, and from the equivalent DC network port of AC, the effect of bearing a direct voltage source is thought in equivalence;
Direct current resistance equivalent network after simplification is specific as follows: comprise that IMD injects source voltage U s, sampling resistor R s, interference source voltage U c, interference source equivalent internal resistance R c, alternating current circuit equivalent insulation resistance R over the ground; R sone end signal is connected to R and R c, an end signal is connected to U sone end, U sother end ground connection; R mono-end signal is connected to R sand R c, one end ground connection; R cone end signal is connected to R and R s, an end signal is connected to U cpositive terminal, U cthe sub-ground connection of negative terminals;
C), utilize IMD forward Injection Signal, i.e. IMD injection source voltage U spositive terminal and sampling resistor R ssignal connects, negative terminals ground connection, and the measured insulation resistance obtaining is designated as R f; Concrete steps are as follows:
Utilize superposition principle, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R f = U s I s - I c - R s - - - ( 1 )
D), utilize the direction of IMD inverse injection signal, IMD injects source voltage U snegative terminals and sampling resistor R ssignal connects, positive terminal ground connection, and the measured insulation resistance obtaining is designated as R r; Concrete steps are as follows:
Utilize superposition principle, I cfor U cthe dirty over-sampling resistance R of independent role scurrent value, I sfor U sthe electric current of the dirty over-sampling resistance of independent role:
R r = U s I s + I c - R s - - - ( 2 )
E), simultaneous formula (1) and formula (2), the real insulating resistance value R of the system that obtains m:
R m = U s I s - R s = 2 1 R f + R s + 1 R r + R s - R s - - - ( 3 )
F), rectifier method for diagnosing faults in system, concrete steps are as follows:
1) monitor value of insulation monitoring and warning device IMD changes;
2) if the R measuring in step c) fwith the R measuring in step a) tthe R measuring in unequal or step d) rwith the R measuring in step a) tunequal, judge now system existing problems;
3) by the insulation resistance actual value R measuring in step e) mwith the R measuring in step a) trelatively, if R m=R t, be diagnosed as rectifier in system and break down.
2. not control rectifier method for diagnosing faults of a kind of full-bridge based on insulating monitoring according to claim 1, is characterized in that: system described in step f) existing problems comprise that rectifier breaks down, the insulation resistance of system itself changes or Installed System Memory at external dc interference source.
3. not control rectifier method for diagnosing faults of a kind of full-bridge based on insulating monitoring according to claim 1 and 2, is characterized in that: in step f), if R m≠ R t, the insulation resistance that is diagnosed as system itself change or Installed System Memory at external dc interference source.
CN201410076825.1A 2014-03-04 2014-03-04 A kind of full-bridge uncontrollable rectifier device method for diagnosing faults based on insulating monitoring Expired - Fee Related CN103884930B (en)

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CN106124978A (en) * 2016-07-27 2016-11-16 江苏镇安电力设备有限公司 A kind of PWM converter method for diagnosing faults based on insulation monitoring and warning device and chaos detection circuit
CN106569079A (en) * 2016-11-02 2017-04-19 国网山东省电力公司青岛市黄岛区供电公司 Online fault detection method of bridge type rectifier
CN107219844A (en) * 2017-06-20 2017-09-29 Tcl空调器(中山)有限公司 Power model startup self-detection method, device and storage medium
CN109633276A (en) * 2018-12-28 2019-04-16 蜂巢能源科技有限公司 Insulation resistance detection method and device based on full-bridge insulation detecting circuit
CN111551788A (en) * 2020-06-04 2020-08-18 杜吉飞 Method for monitoring insulation resistance of direct current side and alternating current side of three-phase inverter

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CN106124978A (en) * 2016-07-27 2016-11-16 江苏镇安电力设备有限公司 A kind of PWM converter method for diagnosing faults based on insulation monitoring and warning device and chaos detection circuit
CN106124978B (en) * 2016-07-27 2018-10-02 江苏镇安电力设备有限公司 A kind of PWM converter method for diagnosing faults based on insulation monitoring device and chaos detection circuit
CN106569079A (en) * 2016-11-02 2017-04-19 国网山东省电力公司青岛市黄岛区供电公司 Online fault detection method of bridge type rectifier
CN106569079B (en) * 2016-11-02 2019-02-12 国网山东省电力公司青岛市黄岛区供电公司 A kind of online test method of bridge-type rectifier failure
CN107219844A (en) * 2017-06-20 2017-09-29 Tcl空调器(中山)有限公司 Power model startup self-detection method, device and storage medium
CN107219844B (en) * 2017-06-20 2020-03-17 Tcl空调器(中山)有限公司 Power module power-on self-test method, device and storage medium
CN109633276A (en) * 2018-12-28 2019-04-16 蜂巢能源科技有限公司 Insulation resistance detection method and device based on full-bridge insulation detecting circuit
CN109633276B (en) * 2018-12-28 2021-04-13 蜂巢能源科技有限公司 Insulation resistance detection method and device based on full-bridge insulation detection circuit
CN111551788A (en) * 2020-06-04 2020-08-18 杜吉飞 Method for monitoring insulation resistance of direct current side and alternating current side of three-phase inverter
CN111551788B (en) * 2020-06-04 2022-06-17 珠海泰坦电力电子集团有限公司 Method for monitoring insulation resistance of direct current side and alternating current side of three-phase inverter

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