CN109557400A - Micro-capacitance sensor three-phase IT system power quality and insulation performance online test method - Google Patents
Micro-capacitance sensor three-phase IT system power quality and insulation performance online test method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
A kind of micro-capacitance sensor three-phase IT system power quality and insulation performance online test method, by include controller unit, insulating signal sampling unit, voltage and current sampling unit device realize.Voltage and current sampling unit, insulating signal sampling unit are respectively used to obtain three-phase voltage current signal and monitor burst pulse voltage signal, over the ground burst pulse voltage signal and send to controller unit to carry out power quality and insulation performance on-line checking；Burst pulse voltage signal opens acquisition by the first electronic switch, the second electronic switch, the third electronic switch in the first sample of signal branch of controller unit control, second signal sampling slip, third sample of signal branch over the ground.The method can be realized and monitor on-line to the power quality and insulation performance of three-phase three-wire system exchange IT system without injecting additional independent signal；The respective insulation against ground resistance value of 3 buses can be accurately calculated, in addition to it can monitor short trouble, additionally it is possible to judge the degree of bus insulation deterioration.
Description
Present patent application is divisional application, and application No. is 201610894157.2, the applying date is 2016 10 for original bill
The moon 13, entitled micro-capacitance sensor three-phase IT system power quality and insulation performance online test method and device.
Technical field
The present invention relates to a kind of electric network performance on-line monitoring method and equipment, especially a kind of micro-capacitance sensor three-phase IT system electricity
It can quality and insulation performance online test method.
Background technique
The micro-grid systems pair such as solar energy, wind energy, geother-mal power generation system and dislocation generation vehicle, petrol and diesel oil generator
When the loads such as mine, field medical vehicle, ship are powered, it is desirable that the high reliablity of power supply, safety are good.It is using IT system power supply
A kind of selection well.IT system occurs that fault current is small when first time failure, and electrical equipment metal shell will not generate danger
The contact voltage of property, therefore can not cut off the power, continue to run electrical equipment, but need to its power quality and insulating properties
It can be carried out on-line monitoring and informed by warning device, check eliminate failure in time.
In current IT system insulated on-line monitoring, the detection method based on Injection Signal is widely used, is infused by acquisition
When entering signal the voltage of sampling resistor perhaps the electric current in IT system phase line when IT system shorted to earth or insulation degradation,
Fault signature in the decline of its insulation against ground resistance, voltage when Injection Signal on sampling resistor or the electric current in IT system phase line
Amount increases severely, and can be judged accordingly.When using injecting signal monitoring IT system insulation, what it is regardless of injection is direct current signal, list
Frequency AC signal or double frequency AC signal require corresponding independent signal source, system complex；And the electricity in independent signal source
It is pressed with valid value and does not allow more than 50V, the judgement and failure line selection positioning belt to fault characteristic value come difficult.
Summary of the invention
In order to solve the problems, such as IT system insulated on-line monitoring, the present invention provides a kind of micro-capacitance sensor three-phase IT systems
Power quality of uniting and insulation performance online test method, the method pass through guarantor for burst pulse voltage-drop loading is monitored between phase line
On the circuit that shield ground is formed, corresponding burst pulse voltage over the ground is formed；According to monitoring burst pulse voltage and corresponding arteries and veins narrow over the ground
It rushes voltage and carries out insulation performance on-line checking；Power quality is analyzed according to three-phase alternating voltage, current data.
The monitoring burst pulse voltage is to load the line voltage of the three-phase IT system with pulse conduction mode to be formed, and is led to
It crosses electronic switch pulsed and opens realization.It is the zero passage of three-phase IT system line voltage at the time of the electronic switch pulsed is opened
Point.
The monitoring burst pulse voltage and corresponding at least 3 groups of burst pulse voltage over the ground.
The method is by micro-capacitance sensor three-phase IT system power quality and the realization of insulation performance on-line measuring device, described device
Including controller unit, insulating signal sampling unit, voltage and current sampling unit.
The insulating signal sampling unit takes including the first sample of signal branch, second signal sampling slip, third signal
Sample branch and sample resistance；First sample of signal branch includes the first electronic switch being connected in series, the first current-limiting resistance, and the
Binary signal sampling slip includes the second electronic switch being connected in series, the second current-limiting resistance, and third sample of signal branch includes string
Join third electronic switch, the third current-limiting resistance of connection；One end of first sample of signal branch is connected to three-phase alternating current IT system
Phase line A, one end of second signal sampling slip is connected to the phase line B of three-phase alternating current IT system, third sample of signal branch
One end is connected to the phase line C of three-phase alternating current IT system；The other end of first sample of signal branch, second signal sampling slip
One end of other end, the other end of third sample of signal branch and sample resistance connects, and the other end of sample resistance connects
It is connected to protecting field.
The voltage of burst pulse over the ground of the three-phase alternating current IT system includes that burst pulse voltage, phase line B are narrow over the ground over the ground by phase line A
Pulse voltage, phase line C burst pulse voltage over the ground, the first electronic switch, the second electronic switch, are controlled by controller unit respectively
Three electronic switches open acquisition.
Described device realizes that the specific steps of power quality and insulation performance online test method include:
Step 1, sampling obtain phase line A burst pulse voltage, phase line B burst pulse voltage, phase line C burst pulse over the ground over the ground over the ground
Voltage；Sampling obtains three-phase alternating voltage, current data；
Step 2, analysis three-phase alternating voltage, current data, obtain respectively with phase line A B pairs of burst pulse voltage, phase line over the ground
Burst pulse voltage monitors burst pulse voltage accordingly over the ground by ground burst pulse voltage, phase line C；Analyze three-phase alternating voltage, electric current number
According to obtaining power quality index；
Step 3, simultaneous phase line A over the ground burst pulse voltage and it is corresponding monitoring burst pulse voltage between relationship expression
Formula, phase line B burst pulse voltage and relational expression, phase line C narrow arteries and veins over the ground between corresponding monitoring burst pulse voltage over the ground
Rush voltage and relational expression and composition equation group between corresponding monitoring burst pulse voltage；
Step 4, solving equations seek phase line A insulation against ground resistance value, phase line B insulation against ground resistance value, phase line C over the ground
Insulating resistance value；
Step 5, result treatment, return to step 1.
Burst pulse voltage may include that burst pulse voltage, phase line A second be over the ground over the ground by phase line A first to the phase line A over the ground
Burst pulse voltage, by controller unit control the first electronic switch respectively between phase line B and phase line C line voltage zero passage, phase line A with
Acquisition is opened between phase line B when line voltage zero passage；Burst pulse voltage may include the narrow arteries and veins over the ground of phase line B first to the phase line B over the ground
Voltage, phase line B second burst pulse voltage over the ground are rushed, the second electronic switch is controlled respectively in phase line C and phase line A by controller unit
Between open acquisition when line voltage zero passage between line voltage zero passage, phase line B and phase line C；Burst pulse voltage can wrap the phase line C over the ground
Burst pulse voltage, phase line C second the burst pulse voltage over the ground over the ground of phase line C first is included, third electronic cutting is controlled by controller unit
Acquisition is opened when line voltage zero passage between line voltage zero passage, phase line C and phase line A between phase line A and phase line B respectively in pass.It is described at this time
Device realizes power quality and the specific steps of insulation performance on-line checking include:
Step 1: sampling obtains burst pulse voltage over the ground；Sampling obtains and three-phase alternating voltage, current data；
Step 2: analysis three-phase alternating voltage, current data, obtain respectively with phase line A first burst pulse voltage, phase over the ground
Burst pulse voltage, phase line B first burst pulse voltage, phase line B second burst pulse voltage, phase line C over the ground over the ground over the ground of line A second
One burst pulse voltage monitors burst pulse voltage accordingly over the ground by burst pulse voltage, phase line C second over the ground；Analyze three-phase alternating current
Pressure, current data, obtain power quality index；
Step 3: being judged according to burst pulse voltage signal over the ground, if the insulation against ground of phase line A, phase line B, phase line C
It is normal, then return to step 1；
Step 4: being judged according to burst pulse voltage signal over the ground, if a phase in phase line A, phase line B, phase line C
Line shorted to earth, then arrive step 7；
Step 5: being judged judge whether phase line A, phase line B, phase line C are right respectively according to burst pulse voltage signal over the ground
Ground defective insulation；
Step 6: calculate 1 phase line insulation against ground it is bad when the phase line insulation against ground resistance value, or calculate 2 phases
2 phase lines respective insulation against ground resistance value when line insulation against ground is bad, or calculate 3 phase line insulation against ground it is bad when should
The respective insulation against ground resistance value of 3 phase lines；
Step 7: result treatment, returns to step 1.
The first sample of signal branch further includes concatenated first diode, and the second signal sampling slip further includes
Concatenated second diode, the third sample of signal branch further include concatenated third diode；
The first sample of signal branch further includes the 4th diode, and second signal sampling slip further includes the five or two pole
Pipe, third sample of signal branch further includes the 6th diode；4th diode is connected in reverse parallel on the first electronic switch, the
Five diodes are connected in reverse parallel on the second electronic switch, and the 6th diode is connected in reverse parallel on third electronic switch.Diode is anti-
To being connected in parallel on electronic switch, refer to that the cathode of diode is connected to the electric current inflow end of electronic switch, anode is connected to electricity
The electric current outflow end of sub switch.
The first diode makes the electric current on the first electronic switch that can only flow to protecting field, the second diode from phase line A
Make the electric current on the second electronic switch that can only flow to protecting field from phase line B, third diode makes the electric current on third electronic switch
Protecting field can only be flowed to from phase line C；Either, first diode flow to the electric current on the first electronic switch can only from protecting field
Phase line A, the second diode make the electric current on the second electronic switch that can only flow to phase line B from protecting field, and third diode makes third
Electric current on electronic switch can only flow to phase line C from protecting field.
Described device can also be including a unit or multiple in alarm unit, man-machine interaction unit, verification unit
Unit.
The beneficial effects of the present invention are: (1) realize simultaneously micro-capacitance sensor three-phase IT system power quality and insulation performance
Line detection；(2) without injecting additional independent signal, it can be realized and the insulation performance of three-phase three-wire system exchange IT system is supervised online
It surveys；(3) monitoring signals are direct current burst pulse voltage, can eliminate the influence that phase line direct-to-ground capacitance monitors insulation resistance；(4) energy
It reaches and accurately calculates the three-phase three-wire system exchange respective insulation against ground resistance value of 3 phase lines of IT system, it is short-circuit former except that can monitor
Barrier is outer, additionally it is possible to judge the degree of phase line insulation degradation.
Detailed description of the invention
Fig. 1 is power quality and insulation performance on-line measuring device embodiment composition block diagram；
Fig. 2 is insulating signal sampling unit embodiment circuit diagram；
Fig. 3 is equivalent circuit diagram when the first electronic switch of insulating signal sampling unit embodiment is opened；
Fig. 4 is equivalent circuit diagram when the second electronic switch of insulating signal sampling unit embodiment is opened；
Fig. 5 is equivalent circuit diagram when insulating signal sampling unit embodiment third electronic switch is opened；
Fig. 6 burst pulse voltage signal schematic diagram for phase line alternating voltage waveform and over the ground.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
It is as shown in Figure 1 power quality and insulation performance on-line measuring device embodiment composition block diagram.Fig. 1 embodiment includes
Controller unit 100, insulating signal sampling unit 200, voltage and current sampling unit 300, verification unit 400, alarm unit
500, man-machine interaction unit 600.A, B, C are respectively the phase line A, phase line B, phase line C of three-phase alternating current IT system, three-phase alternating current IT system
System is the three-wire system of the not neutral conductor；PE is the protection conductor or protecting field of IT system.
It is illustrated in figure 2 insulating signal sampling unit embodiment circuit diagram, including the first electronic switch M1, the second electricity
Sub switch M2, third electronic switch M3, the first current-limiting resistance RE1, the second current-limiting resistance RE2, third current-limiting resistance RE3, sampling electricity
Hinder RS, first diode D1, the second diode D2, third diode D3, the 4th diode D4, the 5th diode D5, the six or two
Pole pipe D6；First electronic switch M1, the first current-limiting resistance RE1, first diode D1, the 4th diode D4 form the first signal take
Sample branch, the second electronic switch M2, the second current-limiting resistance RE2, the second diode D2, the 5th diode D5 composition second signal take
Sample branch, third electronic switch M3, third current-limiting resistance RE3, third diode D3, the 6th diode D6 composition third signal take
Sample branch.In Fig. 2, RF1、RF2、RF3The insulation against ground resistance of respectively phase line A, phase line B, phase line C；K1, K2, K3 are respectively
The control signal of one electronic switch M1, the second electronic switch M2, third electronic switch M3, K1, K2, K3 come from controller unit.
First electronic switch, the second electronic switch, third electronic switch are full-control type electronic switch, and in Fig. 2 embodiment, M1, M2, M3 are adopted
With triode type photoelectrical coupler.First electronic switch, the second electronic switch, third electronic switch can also with DC solid after
Electric appliance or other full-control type electronic switches are replaced.
In Fig. 2 embodiment, the 4th diode D4, the 5th diode D5, the 6th diode D6 protect the first electronic cutting respectively
M1, the second electronic switch M2, third electronic switch M3 are closed, makes it from excessively high backward voltage；When the first electronic switch, second
Where electronic switch, third electronic switch are able to bear when the backward voltage of circuit, the 4th diode, the 5th diode, the 6th
Diode is not necessarily.
Described device will monitor burst pulse voltage-drop loading on the circuit between phase line through protecting field formation, and measurement is corresponding
Burst pulse voltage over the ground；Insulation performance is carried out according to monitoring burst pulse voltage and corresponding burst pulse voltage over the ground to examine online
It surveys；Monitoring burst pulse voltage loads to be formed by one of the line voltage pulsed controlled between three-phase IT system phase line.First electricity
Sub switch, the second electronic switch, third electronic switch are the short time, pulsed open-minded, and are only controlled every time therein
One is opened and is connected.First electronic switch can control it is open-minded when phase line A current potential is optionally greater than protecting field PE current potential, at this time
Electric current on first electronic switch can only flow to protecting field PE from phase line A, or be controlled at phase line A current potential lower than protecting field PE
Open-minded when current potential, the electric current on the first electronic switch can only flow to phase line A from protecting field PE at this time；Similarly, the second electronic cutting
Pass can control phase line B current potential be higher than protecting field PE current potential when it is open-minded, the electric current on the second electronic switch can only be from phase at this time
Line B flows to protecting field PE, or while being controlled at phase line B current potential lower than protecting field PE current potential is open-minded, at this time the second electronic switch
On electric current phase line B can only be flowed to from protecting field PE；Third electronic switch, which can control, is higher than protecting field PE electricity in phase line C current potential
Position Shi Kaitong, the electric current on third electronic switch can only flow to protecting field PE from phase line C at this time, or be controlled at phase line C electricity
Open-minded when position is lower than protecting field PE current potential, the electric current on third electronic switch can only flow to phase line C from protecting field PE at this time.Due to
Protecting field PE current potential is related to A, B, C triphasic potential and its insulation against ground, therefore, when certain phase line current potential is greater than in addition
When two phase line current potentials, which is optionally greater than protecting field PE current potential certainly；Either be lower than when certain phase line current potential or
When equal to other two phase line current potentials, which is lower than certainly equal to protecting field PE current potential.
In Fig. 2 embodiment, first diode D1 makes the electric current of the first electronic switch M1 that can only flow to protecting field from phase line A
PE, the second diode D2 make the second electronic switch M2 electric current that can only flow to protecting field PE from phase line B, and third diode D3 makes third
Electronic switch M3 electric current can only flow to protecting field PE from phase line C；When the first electronic switch, the second electronic switch, third electronic cutting
Closing has one-way conduction performance and when without in parallel 4th diode, the 5th diode, six diodes, first diode, the
Two diodes, third diode are not necessarily.
By first diode D1, the second diode D2, third diode D3, the 4th diode D4, in Fig. 2 embodiment
Part Opposite direction connection in five diode D5, the 6th diode D6, the first electronic switch M1, the second electronic switch M2, third electricity
Part Opposite direction connection in the current direction of sub switch M3, then the electric current of M1, M2, M3 partially can only flow to phase from protecting field PE
The slave phase line of line, rest part flows to protecting field PE.When by first diode D1, the second diode D2, in Fig. 2 embodiment
Three diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6 whole Opposite direction connection, the first electronic switch M1,
The current direction whole Opposite direction connection of second electronic switch M2, third electronic switch M3, then first diode D1 makes the first electronics
The electric current of switch M1 can only flow to phase line A from protecting field PE, and the second diode D2 makes the second electronic switch M2 electric current can only be from guarantor
Shield ground PE flows to phase line B, and third diode D3 makes third electronic switch M3 electric current that can only flow to phase line C from protecting field PE.
It is illustrated in figure 3 equivalent circuit diagram when insulating signal sampling unit the first electronic switch of embodiment is opened, phase line A
Burst pulse voltage U over the ground1Acquisition is opened by controller unit control M1.When opening M1 in Fig. 3, phase line A current potential should be higher than that protection
Ground PE current potential.3 line voltage U of Fig. 3AB、UBC、UACIn only 2 be it is independent, use 2 monitorings burst pulse voltage therein
?.Enable the U in Fig. 3ABFor UAB4, UBCFor UBC4, and enable RE1=RE, there is R4=RE1+RS=RE+RS.Have at this time
It is illustrated in figure 4 equivalent circuit diagram when insulating signal sampling unit the second electronic switch of embodiment is opened, phase line B
Burst pulse voltage U over the ground2Acquisition is opened by controller unit control M2.When opening M2 in Fig. 4, phase line B current potential should be higher than that protection
Ground PE current potential.3 line voltage U of Fig. 4BC、UCA、UBAIn only 2 be it is independent, use 2 monitorings burst pulse voltage therein
?.Enable the U in Fig. 4BCFor UBC5, UCAFor UCA5, and enable RE2=RE, there is R4=RE2+RS=RE+RS.Have at this time
It is illustrated in figure 5 equivalent circuit diagram when insulating signal sampling unit embodiment third electronic switch is opened, phase line C
Burst pulse voltage U over the ground3Acquisition is opened by controller unit control M3.When opening M3 in Fig. 5, phase line C current potential should be higher than that protection
Ground PE current potential.3 line voltage U of Fig. 5CA、UAB、UCBIn only 2 be it is independent, use 2 monitorings burst pulse voltage therein
?.Enable the U in Fig. 5CAFor UCA6, UABFor UAB6, and enable RE3=RE, there is R4=RE3+RS=RE+RS.Have at this time
Formula (1), formula (2), in formula (3), only RF1、RF2、RF3For unknown quantity, when measuring the first electronic switch respectively and opening
Monitoring burst pulse voltage UAB4、UBC4With phase line A burst pulse voltage U over the ground1, monitoring burst pulse when the second electronic switch is opened
Voltage UBC5、UCA5With phase line B burst pulse voltage U over the ground2, monitoring burst pulse voltage U when third electronic switch is openedCA6、UAB6
With phase line C burst pulse voltage U over the ground3, joint type (1), formula (2), formula (3) can calculate RF1、RF2、RF3.Calculate RF1、RF2、
RF3With realize power quality on-line checking specific steps include:
Step 1, sampling obtain phase line A burst pulse voltage, phase line B burst pulse voltage, phase line C burst pulse over the ground over the ground over the ground
Voltage；Sampling obtains three-phase alternating voltage, current data；
Step 2, analysis three-phase alternating voltage, current data, obtain respectively with phase line A B pairs of burst pulse voltage, phase line over the ground
Burst pulse voltage monitors burst pulse voltage accordingly over the ground by ground burst pulse voltage, phase line C；Analyze three-phase alternating voltage, electric current number
According to obtaining power quality index；
Step 3, simultaneous phase line A over the ground burst pulse voltage and it is corresponding monitoring burst pulse voltage between relationship expression
Formula, phase line B burst pulse voltage and relational expression, phase line C narrow arteries and veins over the ground between corresponding monitoring burst pulse voltage over the ground
Rush voltage and relational expression and composition equation group between corresponding monitoring burst pulse voltage；
Step 4, solving equations seek phase line A insulation against ground resistance value, phase line B insulation against ground resistance value, phase line C over the ground
Insulating resistance value；
Step 5, as the result is shown and alert process, returns to step 1.
In formula (1), as selection UBC4=0, the U i.e. in Fig. 3BC=0 either UAB4=0, the U i.e. in Fig. 3ABWhen=0
Opening M1 can simplify expression formula, offer convenience to calculating, UBC=0, UABIt is narrow over the ground that the phase line A that M1 is obtained is opened when=0 respectively
Pulse voltage U1It is expressed as the burst pulse voltage U over the ground of phase line A first11, the burst pulse voltage U over the ground of phase line A second12.Formula
(2), formula (3) is same, is the zero crossing of three-phase IT system line voltage at the time of electronic switch pulsed is opened, in Fig. 4
UCA=0, UBCPhase line B that M2 is obtained burst pulse voltage U over the ground is opened when=0 respectively2It is narrow over the ground to be expressed as phase line B first
Pulse voltage U21, the burst pulse voltage U over the ground of phase line A second22；U in Fig. 5AB=0, UCAOpen what M3 was obtained when=0 respectively
Phase line C burst pulse voltage U over the ground3It is expressed as the burst pulse voltage U over the ground of phase line C first31, the burst pulse over the ground of phase line A second
Voltage U32。
In Fig. 3, the burst pulse voltage U over the ground of phase line A first11By controller unit control M1 in UBCAcquisition is opened when=0,
If loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UAB1, i.e. U in Fig. 3AB, U11
For the U in Fig. 3 at this time1；The burst pulse voltage U over the ground of phase line A second12, by controller unit control M1 in UAC=0 or UAB=0
Shi Kaitong is obtained, if loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UAB3Or
UBC2, i.e. U in Fig. 3ABOr UBC, U12For the U in Fig. 3 at this time1.Select UBC0 or UAC=0 or UAB=0 equal zero crossings
When opening M1, the zero crossing phase line A current potential of selection should be higher than that protecting field PE current potential, M1 electric current flow to protecting field PE from phase line A.
In Fig. 4, the burst pulse voltage U over the ground of phase line B first21By controller unit control M2 in UCAAcquisition is opened when=0,
If loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UBC1, i.e. U in Fig. 4BC, U21
For the U in Fig. 4 at this time2；The burst pulse voltage U over the ground of phase line B second22, by controller unit control M2 in UBA=0 or UBC=0
Shi Kaitong is obtained, if loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UBC3Or
UCA2, i.e. U in Fig. 4BCOr UCA, U22For the U in Fig. 4 at this time2.Select UCA0 or UBA=0 or UBC=0 equal zero crossings
When opening M2, the zero crossing phase line B current potential of selection should be higher than that protecting field PE current potential, M2 electric current flow to protecting field PE from phase line B.
In Fig. 5, the burst pulse voltage U over the ground of phase line C first31By controller unit control M3 in UABAcquisition is opened when=0,
If loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UCA1, i.e. U in Fig. 5CA, U31
For the U in Fig. 5 at this time3；The burst pulse voltage U over the ground of phase line C second32, by controller unit control M3 in UCB=0 or UCA=0
Shi Kaitong is obtained, if loading the monitoring burst pulse voltage on the circuit formed between phase line, by PE at this time is UCA3Or
UAB2, i.e. U in Fig. 5CAOr UAB, U32For the U in Fig. 5 at this time3.Select UAB0 or UCB=0 or UCA=0 equal zero crossings
When opening M3, the zero crossing phase line C current potential of selection should be higher than that protecting field PE current potential, M3 electric current flow to protecting field PE from phase line C.
Under the different conditions of system, burst pulse is electric over the ground by the phase line A first that measurement obtains when M1, M2, M3 are opened respectively
Press U11, the burst pulse voltage U over the ground of phase line A second12, the burst pulse voltage U over the ground of phase line B first21, the burst pulse over the ground of phase line B second
Voltage U22, the burst pulse voltage U over the ground of phase line C first31, the burst pulse voltage U over the ground of phase line C second32It is shown in Table 1.
Fig. 6 show phase line alternating voltage waveform and over the ground burst pulse voltage signal schematic diagram.In Fig. 6, UAB、UBC、UCAFor
Phase line A, phase line B, the line voltage between phase line C, pulse 1, pulse 2, pulse 3, pulse 4, pulse 5, moment point shown in pulse 6
It Wei not the burst pulse voltage U over the ground of phase line A first11, the burst pulse voltage U over the ground of phase line A second12, the burst pulse over the ground of phase line B first
Voltage U21, the burst pulse voltage U over the ground of phase line B second22, the burst pulse voltage U over the ground of phase line C first31, the narrow arteries and veins over the ground of phase line C second
Rush voltage U32The measurement moment.
Table 1
The burst pulse voltage U over the ground of phase line A first11, the burst pulse voltage U over the ground of phase line A second12It is measured when M1 is opened
It arrives, in table 1, U11For UBCResulting U is measured when=01Value, U21For UABResulting U is measured when=01Value.
When A, B, C insulation against ground are normal, RF1、RF2、RF3Numerical value it is very big, therefore, either in UBCInstitute is measured when=0
The U obtained11Value, or in UABResulting U is measured when=012Value, is equal to or is close to 0 value.
When A shorted to earth, the current potential of protecting field PE is equal to A phase current potential, therefore, either in UBCGained is measured when=0
U11Value, or in UABResulting U is measured when=012Value, is equal to or is close to 0 value.
When B shorted to earth, the current potential of protecting field PE is equal to B phase current potential, therefore, in UBCU is measured when=01, there is U11≈
UAB1；In UABU is measured when=01, there is U12≈0。
When C shorted to earth, the current potential of protecting field PE is equal to C phase current potential, therefore, in UBCU is measured when=01, there is U11≈
UAB1；In UABU is measured when=01, there is U12≈UBC2。
When only A insulation against ground is bad, RF2、RF3Numerical value it is very big, RF1For the undesirable resistance value of A insulation against ground, because
This, in UBCResulting U is measured when=011Value is R4With RF1In parallel and RF2With RF3To monitoring burst pulse voltage U after parallel connectionAB1Point
Pressure value is close to 0 value；In UABResulting U is measured when=012Value is R4、RF1、RF2After parallel connection and RF3To monitoring burst pulse voltage
UBC2Partial pressure value, be close to 0 value.
When only B insulation against ground is bad, RF1、RF3Numerical value it is very big, RF2For the undesirable resistance value of B insulation against ground, because
This, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse voltage at this time after parallel connection
UAB1Partial pressure value, be close to R4And RF2To U at this timeAB1Partial pressure value；In UABResulting U is measured when=012Value is R4、RF1、RF2
After parallel connection and RF3To monitoring burst pulse voltage U at this timeBC2Partial pressure value, be close to 0 value.
When only C insulation against ground is bad, RF1、RF2Numerical value it is very big, RF3For the undesirable resistance value of C insulation against ground, because
This, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse voltage at this time after parallel connection
UAB1Partial pressure value, be close to R4And RF3To U at this timeAB1Partial pressure value；In UABResulting U is measured when=012Value is R4、RF1、RF2
After parallel connection and RF3To monitoring burst pulse voltage U at this timeBC2Partial pressure value, be close to R4And RF3To U at this timeBC2Partial pressure value.
When having A, B insulation against ground bad, RF3Numerical value it is very big, RF1、RF2The respectively undesirable resistance of A, B insulation against ground
Value, therefore, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse at this time after parallel connection
Voltage UAB1Partial pressure value, be close to R4With RF1After parallel connection and RF2To U at this timeAB1Partial pressure value；In UABIt is measured when=0 resulting
U12Value is R4、RF1、RF2After parallel connection and RF3To monitoring burst pulse voltage U at this timeBC2Partial pressure value, be close to 0 value.
When having B, C insulation against ground bad, RF1Numerical value it is very big, RF2、RF3The respectively undesirable resistance of B, C insulation against ground
Value, therefore, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse at this time after parallel connection
Voltage UAB1Partial pressure value, be close to R4And RF2With RF3To U at this time after parallel connectionAB1Partial pressure value；In UABIt is measured when=0 resulting
U12Value is R4、RF1、RF2After parallel connection and RF3To monitoring burst pulse voltage U at this timeBC2Partial pressure value, be close to R4With RF2After parallel connection and
RF3To U at this timeBC2Partial pressure value.
When having C, A insulation against ground bad, RF2Numerical value it is very big, RF1、RF3The respectively undesirable resistance of A, C insulation against ground
Value, therefore, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse at this time after parallel connection
Voltage UAB1Partial pressure value, be close to R4With RF1After parallel connection and RF3To U at this timeAB1Partial pressure value；In UABIt is measured when=0 resulting
U12Value is R4、RF1、RF2After parallel connection and RF3To monitoring burst pulse voltage U at this timeBC2Partial pressure value, be close to R4、RF1After parallel connection and
RF3To U at this timeBC2Partial pressure value.
When the equal insulation against ground of A, B, C is bad, RF1、RF2、RF3The respectively undesirable resistance value of A, B, C insulation against ground, because
This, in UBCResulting U is measured when=011Value is R4With RF1After parallel connection and RF2With RF3To monitoring burst pulse voltage at this time after parallel connection
UAB1Partial pressure value；In UABResulting U is measured when=012Value is R4、RF1、RF2After parallel connection and RF3To monitoring burst pulse voltage at this time
UBC2Partial pressure value.
The burst pulse voltage U over the ground of phase line B first21, the burst pulse voltage U over the ground of phase line B second22It is measured when M2 is opened
It arrives, in table 1, U21For UCAResulting U is measured when=02Value, U22For UBCResulting U is measured when=02Value.Phase line C first is narrow over the ground
Pulse voltage U31, the burst pulse voltage U over the ground of phase line C second32When M3 is opened, measurement is obtained, in table 1, U31For UABIt is measured when=0
Resulting U3Value, U32For UCAResulting U is measured when=03Value.U21、U22Measurement method and U31、U32Measurement method and
U11、U12Measurement method it is identical, measurement result is shown in Table 1.
1 data of table are observed it may be concluded that working as U11、U12、U21、U22、U31、U32When being nearly equal to 0, phase line A, phase line
B, the insulation against ground of phase line C is normal；Work as U11≈UAB1、U12When ≈ 0, phase line B shorted to earth；Work as U21≈UBC1、U22When ≈ 0, phase
Line C shorted to earth；Work as U31≈UCA、U32When ≈ 0, phase line A shorted to earth.
Work as U11Value be UAB1Partial pressure value, i.e. 0 < U11< UAB1, and U12When ≈ 0, phase line B insulation against ground is bad；Work as U21
Value be UBC1Partial pressure value, i.e. 0 < U21< UBC1, and U22When ≈ 0, phase line C insulation against ground is bad；Work as U31Value be UCA1Point
Pressure value, i.e. 0 < U31< UCA1, and U32When ≈ 0, phase line A insulation against ground is bad.
If above-mentioned condition is not satisfied, the equal insulation against ground of phase line A, B, C is bad.
When only phase line A insulation against ground is bad, arbitrarily measures and calculate U21、U22、U32Appointing in three measured value intrinsic standoff ratios
What one or more, for example, measuring and calculating U31Intrinsic standoff ratio, i.e., in UABM3 is open-minded when=0, measures U at this time31And
Its corresponding monitoring burst pulse voltage UCA, i.e.,
R can be calculatedF1。
When only phase line B insulation against ground is bad, arbitrarily measures and calculate U11、U31、U32Appointing in three measured value intrinsic standoff ratios
What one or more, for example, measuring and calculating U11Intrinsic standoff ratio, i.e., in UBCM1 is open-minded when=0, measures U at this time11And
Its corresponding monitoring burst pulse voltage UAB1, i.e.,
R can be calculatedF2。
When only phase line C insulation against ground is bad, arbitrarily measures and calculate U11、U12、U21Appointing in three measured value intrinsic standoff ratios
What one or more, for example, measuring and calculating U21Intrinsic standoff ratio, i.e., in UCAM2 is open-minded when=0, measures U at this time21And
Its corresponding monitoring burst pulse voltage UBC1, i.e.,
R can be calculatedF3。
When to monitoring burst pulse voltage, burst pulse voltage takes multiple measurements to obtain multiple measured values over the ground, to multiple points
Pressure ratio is measured and is calculated, or the same intrinsic standoff ratio, multiple intrinsic standoff ratios are taken multiple measurements and calculated, and is obtained same
When the insulating resistance value of phase line has multiple calculated results, it should carry out including seeking arithmetic to multiple measured values, multiple calculated results
Average value, median, sliding average, median average value or other modes data processing after surveyed accordingly
Magnitude or final calculation result.
When having A, B insulation against ground bad, arbitrarily measures and calculate U11、U12、U21、U22、U31、U32In 2 non-zero value and
The intrinsic standoff ratio of nonlinear correlation, i.e., any measurement simultaneously calculate U11Or U32、U21Or U22、U31In 2 intrinsic standoff ratios and with its phase
The monitoring burst pulse voltage answered, and the relevant expression formula of simultaneous, can calculate RF1、RF2。U11、U21、U22、U31、U32Deng point
Pressure ratio expression formula is respectively
Wherein, formula (4) and formula (8) are linearly related, and formula (5) and formula (6) are linearly related.For example, measuring and calculating U11、U21
Intrinsic standoff ratio, joint type (4) and formula (5) can calculate RF1、RF2。
Similarly, it when having B, C insulation against ground bad, arbitrarily measures and calculates U11、U12、U21、U22、U31、U3In 2
The intrinsic standoff ratio of non-zero value and nonlinear correlation, and the relevant expression formula of simultaneous, can calculate RF2、RF3；When having A, C insulation against ground
When bad, arbitrarily measure and calculate U11、U12、U21、U22、U31、U32In 2 non-zero value and nonlinear correlation intrinsic standoff ratio, it is in parallel
Relevant expression formula is found, R can be calculatedF1、RF3。
When the equal insulation against ground of A, B, C is bad, arbitrarily measures and calculate U11、U12、U21、U22、U31、U32In 3 partial pressure
Than and its corresponding monitoring burst pulse voltage, and the relevant expression formula of simultaneous, R can be calculatedF1、RF2、RF3.Correlation point
The expression formula of pressure ratio is
For example, measuring and calculating U12、U22、U32Its corresponding monitoring burst pulse voltage UBC2、UCA2、UAB2Intrinsic standoff ratio,
Joint type (10), formula (12) and formula (14), can calculate RF1、RF2、RF3。
When to monitoring burst pulse voltage, burst pulse voltage takes multiple measurements to obtain multiple measured values over the ground；Simultaneous multiple groups
Multiple calculated results of same phase line insulating resistance value are calculated in expression formula；Either to the same intrinsic standoff ratio, multiple partial pressures
Than taking multiple measurements and calculating, when obtaining the insulating resistance value of same phase line has multiple calculated results, it should to multiple measurements
Value, multiple calculated results carry out include ask arithmetic mean of instantaneous value, median, sliding average, median average value or other
Corresponding measured value or final calculation result are obtained after the data processing of mode.
The burst pulse voltage U over the ground of phase line A first11, the burst pulse voltage U over the ground of phase line A second12By acquiring the first electronics
Switch M1 is respectively in UBC=0, UAB=0 R of sample resistance when openingSOn voltage UC1It obtains, has
Or
The burst pulse voltage U over the ground of phase line B first21, the burst pulse voltage U over the ground of phase line B second22By acquiring the second electronics
Switch M2 is respectively in UCA=0, UBC=0 R of sample resistance when openingSOn voltage UC2It obtains, has
Or
The burst pulse voltage U over the ground of phase line C first31, the burst pulse voltage U over the ground of phase line C second32By acquiring third electronics
Switch M3 is respectively in UAB=0, UCA=0 R of sample resistance when openingSOn voltage UC3It obtains, has
Or
Phase line A, B, C's is electric over the ground when opening for the first electronic switch of limitation, the second electronic switch, third electronic switch
Stream, the first current-limiting resistance RE1, the second current-limiting resistance RE2, third current-limiting resistance RE3Resistance value be preferably greater than 500k Ω, especially
Preferably greater than 2M Ω.
First electronic switch, the second electronic switch, the service time of third electronic switch are very short, are loaded at this time in phase line
Between, by PE formed circuit on monitoring burst pulse voltage be the equal of direct current burst pulse voltage, over the ground due to phase line
Capacitor is small, to sample resistance RSOn voltage when being sampled, the charge and discharge to direct-to-ground capacitance are completed in direct current burst pulse voltage,
Insulating monitoring can be impacted to avoid phase line direct-to-ground capacitance.
When burst pulse voltage includes burst pulse voltage, phase line A second burst pulse over the ground over the ground of phase line A first to phase line A over the ground
Voltage, burst pulse voltage includes burst pulse voltage, phase line B second the burst pulse voltage over the ground over the ground of phase line B first to phase line B over the ground,
Phase line C over the ground burst pulse voltage include phase line C first over the ground burst pulse voltage, phase line C second over the ground burst pulse voltage when, it is described
Device realizes power quality and the specific steps of insulation performance on-line checking include:
Step 1: sampling obtains burst pulse voltage over the ground；Sampling obtains three-phase alternating voltage, current data；
Step 2: analysis three-phase alternating voltage, current data, obtain respectively with phase line A first burst pulse voltage, phase over the ground
Burst pulse voltage, phase line B first burst pulse voltage, phase line B second burst pulse voltage, phase line C over the ground over the ground over the ground of line A second
One burst pulse voltage monitors burst pulse voltage accordingly over the ground by burst pulse voltage, phase line C second over the ground；Analyze three-phase alternating current
Pressure, current data, obtain power quality index；
Step 3: being judged according to burst pulse voltage signal over the ground, if the insulation against ground of phase line A, phase line B, phase line C
It is normal, then return to step 1；
Step 4: being judged according to burst pulse voltage signal over the ground, if a phase in phase line A, phase line B, phase line C
Line shorted to earth, then arrive step 7；
Step 5: being judged judge whether phase line A, phase line B, phase line C are right respectively according to burst pulse voltage signal over the ground
Ground defective insulation；
Step 6: calculate 1 phase line insulation against ground it is bad when the phase line insulation against ground resistance value, or calculate 2 phases
2 phase lines respective insulation against ground resistance value when line insulation against ground is bad, or calculate 3 phase line insulation against ground it is bad when should
The respective insulation against ground resistance value of 3 phase lines；
Step 7: as the result is shown and alert process, returning to step 1.
Voltage and current sampling unit is for obtaining three-phase IT system A, B, C tri- alternate line voltage signal and A, B, C three-phase
Line current signal.Controller unit needs to control voltage and current sampling unit and is continuously adopted to three-phase alternating voltage, electric current
Sample, to carry out power quality analysis.The zero crossing of phase line alternating voltage and monitoring burst pulse voltage corresponding with zero crossing
Signal is analyzed to obtain by voltage continuous sampling data of the controller unit to voltage and current sampling unit.Analyze three-phase alternating current
Pressure, current data, obtain power quality index, are mainly calculated by FFT and other are calculated and analysis, obtain micro-capacitance sensor three
The indexs such as voltage deviation, frequency departure, harmonic wave and the voltage fluctuation and flicker of phase IT system.How design voltage current sampling
Unit is simultaneously realized by controller unit to three-phase alternating voltage, current signal progress continuous sampling, and to continuous sampling number
According to being analyzed to obtain the zero crossing and monitoring burst pulse voltage signal corresponding with zero crossing of phase line alternating voltage, pass through
FFT is calculated and other are calculated and analysis, obtains voltage deviation, frequency departure, harmonic wave and the electricity of micro-capacitance sensor three-phase IT system
The indexs such as pressure fluctuation and flickering, are the routine techniques that professional and technical personnel in the field are grasped.
When the insulation against ground of three-phase alternating current IT system deteriorates or has shorted to earth failure, phase line insulation against ground resistance is less than
When the threshold resistance of setting, controller unit is alarmed by alarm unit.Man-machine interaction unit sets for realizing threshold resistance
Fixed, each phase line insulation against ground resistance value such as shows at the functions.It carries out needed for the designing and Implementing of alarm unit and man-machine interaction unit
Function is the routine techniques that professional and technical personnel in the field are grasped.
Verification unit is used for the monitoring to the insulation performance and carries out function check.In embodiment illustrated in fig. 1, verification unit
400 are controlled by man-machine interaction unit by controller unit.Verification unit can also be controlled directly by man-machine interaction unit,
Directly controlled by switch, button.Carry out function check when, verification unit between phase line A and protecting field, or
Between phase line B and protecting field, or between phase line C and protecting field, or simultaneously at more between phase line and protecting field
Whether access verification resistance, observation device can work normally.It is directly controlled by switch, button, or by human-computer interaction list
Member is controlled by controller unit, between phase line A and protecting field, or between phase line B and protecting field, either
At more, access verifies resistance between phase line and protecting field between phase line C and protecting field, or simultaneously, is this field profession
The routine techniques that technical staff is grasped.
Controller unit includes the functional modules such as MCU and A/D converter, signal conditioning circuit and circuit.Voltage and current
The voltage signal of burst pulse over the ground that phase line ac voltage signal, the insulating signal sampling unit of sampling unit output export is through signal
It send after conditioning circuit processing to A/D converter, A/D converter output data transfers to MCU to handle.MCU and insulating signal sampling are single
Member, verification unit, alarm unit, man-machine interaction unit etc. have electrical connection, to carry out relevant information transmitting.Control core
MCU can choose the microcontrollers such as DSP, ARM, single-chip microcontroller.How to select and use A/D converter, and how modelled signal
Conditioning circuit makes voltage and current sampling unit, the signal of insulating signal sampling unit output meets A/D converter and inputs to signal
Requirement, be the routine techniques that professional and technical personnel in the field are grasped.
Described device further includes having DC power source unit.External power supply can be used in DC power source unit, can also be by three-phase
It is obtained after alternating voltage decompression, rectification, filtering, pressure stabilizing.
Claims (10)
1. a kind of micro-capacitance sensor three-phase IT system power quality and insulation performance online test method, which is characterized in that will monitor narrow
Pulse voltage load forms corresponding burst pulse voltage over the ground on the circuit between phase line through protecting field formation；According to prison
It surveys burst pulse voltage and corresponding burst pulse voltage over the ground carries out insulation performance on-line checking；According to three-phase alternating voltage, electric current
Data analyze power quality.
2. micro-capacitance sensor three-phase IT system power quality according to claim 1 and insulation performance online test method, special
Sign is that the monitoring burst pulse voltage is to load the line voltage of the three-phase IT system with pulse conduction mode to be formed, and leads to
It crosses electronic switch pulsed and opens realization.
3. micro-capacitance sensor three-phase IT system power quality according to claim 2 and insulation performance online test method, special
Sign is, is the zero crossing of three-phase IT system line voltage at the time of the electronic switch pulsed is opened.
4. micro-capacitance sensor three-phase IT system power quality according to claim 2 and insulation performance online test method, special
Sign is, the monitoring burst pulse voltage and corresponding at least 3 groups of burst pulse voltage over the ground.
5. micro-capacitance sensor three-phase IT system power quality described in any one of -4 and insulation performance on-line checking according to claim 1
Method, it is characterised in that: by the device realization for including controller unit, insulating signal sampling unit, voltage and current sampling unit；
The insulating signal sampling unit includes the first sample of signal branch, second signal sampling slip, third sample of signal branch
Road and sample resistance；First sample of signal branch includes the first electronic switch being connected in series, the first current-limiting resistance, the second letter
Number sampling slip includes the second electronic switch being connected in series, the second current-limiting resistance, and third sample of signal branch includes that series connection connects
Third electronic switch, the third current-limiting resistance connect；One end of first sample of signal branch is connected to the phase of three-phase alternating current IT system
Line A, one end of second signal sampling slip are connected to the phase line B of three-phase alternating current IT system, one end of third sample of signal branch
It is connected to the phase line C of three-phase alternating current IT system；The other end of first sample of signal branch, second signal sampling slip are in addition
One end of one end, the other end of third sample of signal branch and sample resistance connects, and the other end of sample resistance is connected to
Protecting field.
6. micro-capacitance sensor three-phase IT system power quality according to claim 5 and insulation performance online test method, special
Sign is that the voltage of burst pulse over the ground of the three-phase alternating current IT system includes that burst pulse voltage, phase line B are narrow over the ground over the ground by phase line A
Pulse voltage, phase line C burst pulse voltage over the ground, the first electronic switch, the second electronic switch, are controlled by controller unit respectively
Three electronic switches open acquisition.
7. micro-capacitance sensor three-phase IT system power quality according to claim 6 and insulation performance online test method, special
Sign is, burst pulse voltage includes burst pulse voltage, phase line A second burst pulse over the ground over the ground of phase line A first to the phase line A over the ground
Voltage controls the first electronic switch line voltage zero passage, phase line A and phase line B between phase line B and phase line C respectively by controller unit
Between line voltage zero passage when open acquisition；Burst pulse voltage includes phase line B first burst pulse voltage, phase over the ground to the phase line B over the ground
The burst pulse voltage over the ground of line B second controls the second electronic switch line voltage between phase line C and phase line A respectively by controller unit
Acquisition is opened when line voltage zero passage between zero passage, phase line B and phase line C；Burst pulse voltage includes phase line C first to the phase line C over the ground
Burst pulse voltage, phase line C second burst pulse voltage over the ground over the ground, by controller unit control third electronic switch respectively in phase line
Acquisition is opened when line voltage zero passage between line voltage zero passage, phase line C and phase line A between A and phase line B.
8. micro-capacitance sensor three-phase IT system power quality according to claim 7 and insulation performance online test method,
It is characterized in that, realizes power quality and the specific steps of insulation performance on-line checking include:
Step 1: sampling obtains burst pulse voltage over the ground；Sampling obtains and three-phase alternating voltage, current data；
Step 2: analysis three-phase alternating voltage, current data, obtain respectively with phase line A first burst pulse voltage, phase line A over the ground
Second burst pulse voltage, phase line B first burst pulse voltage, phase line B second burst pulse voltage, phase line C first over the ground over the ground over the ground
Burst pulse voltage monitors burst pulse voltage accordingly over the ground by burst pulse voltage, phase line C second over the ground；Analysis three-phase alternating voltage,
Current data obtains power quality index；
Step 3: being judged according to burst pulse voltage signal over the ground, if the insulation against ground of phase line A, phase line B, phase line C are just
Often, then step 1 is returned to；
Step 4: being judged according to burst pulse voltage signal over the ground, if a phase line pair in phase line A, phase line B, phase line C
Ground short circuit then arrives step 7；
Step 5: being judged judge whether phase line A, phase line B, phase line C are exhausted over the ground respectively according to burst pulse voltage signal over the ground
Edge is bad；
Step 6: calculate 1 phase line insulation against ground it is bad when the phase line insulation against ground resistance value, or calculate 2 phase lines pair
2 phase lines respective insulation against ground resistance value when ground defective insulation, or calculate 3 phase line insulation against ground it is bad when this 3
The respective insulation against ground resistance value of phase line；
Step 7: result treatment, returns to step 1.
9. micro-capacitance sensor three-phase IT system power quality according to claim 5 and insulation performance online test method, special
Sign is that the first sample of signal branch further includes concatenated first diode, and the second signal sampling slip further includes
Concatenated second diode, the third sample of signal branch further include concatenated third diode；
The first sample of signal branch further includes the 4th diode, and second signal sampling slip further includes the 5th diode, the
Three sample of signal branches further include the 6th diode；4th diode is connected in reverse parallel on the first electronic switch, and the five or two
Pole pipe is connected in reverse parallel on the second electronic switch, and the 6th diode is connected in reverse parallel on third electronic switch；
The first diode makes the electric current on the first electronic switch that can only flow to protecting field from phase line A, and the second diode makes
Electric current on two electronic switches can only flow to protecting field from phase line B, and third diode makes the electric current on third electronic switch can only
Protecting field is flowed to from phase line C；Either, first diode makes the electric current on the first electronic switch that can only flow to phase line from protecting field
A, the second diode make the electric current on the second electronic switch that can only flow to phase line B from protecting field, and third diode makes third electronics
Electric current on switch can only flow to phase line C from protecting field.
10. micro-capacitance sensor three-phase IT system power quality according to claim 6 and insulation performance online test method, special
Sign is, realizes power quality and the specific steps of insulation performance on-line checking include:
Step 1, sampling obtain phase line A, and burst pulse is electric over the ground by burst pulse voltage, phase line C over the ground by burst pulse voltage, phase line B over the ground
Pressure；Sampling obtains three-phase alternating voltage, current data；
Step 2, analysis three-phase alternating voltage, current data, burst pulse voltage, phase line B are narrow over the ground over the ground with phase line A respectively for acquisition
Burst pulse voltage monitors burst pulse voltage accordingly over the ground by pulse voltage, phase line C；Three-phase alternating voltage, current data are analyzed, is obtained
To power quality index；
Step 3, simultaneous phase line A over the ground burst pulse voltage and it is corresponding monitoring burst pulse voltage between relational expression, phase
Line B burst pulse voltage and relational expression, phase line C burst pulse voltage over the ground between corresponding monitoring burst pulse voltage over the ground
And relational expression and composition equation group between corresponding monitoring burst pulse voltage；
Step 4, solving equations seek phase line A insulation against ground resistance value, phase line B insulation against ground resistance value, phase line C insulation against ground
Resistance value；
Step 5, result treatment, return to step 1.
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