CN106443384A - Single-phase AC IT system insulation monitoring apparatus - Google Patents

Single-phase AC IT system insulation monitoring apparatus Download PDF

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Publication number
CN106443384A
CN106443384A CN201610894550.1A CN201610894550A CN106443384A CN 106443384 A CN106443384 A CN 106443384A CN 201610894550 A CN201610894550 A CN 201610894550A CN 106443384 A CN106443384 A CN 106443384A
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bus
electronic switch
resistance
voltage
ground
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凌云
刘建华
肖伸平
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Hunan University of Technology
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Hunan University of Technology
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The invention discloses a single-phase AC IT system insulation monitoring apparatus. The apparatus comprises a controller unit, a zero-crossing detection unit, an insulation signal sampling unit and a peak voltage sampling unit. The insulation signal sampling unit is provided with a first signal sampling branch comprising a first electronic switch, a second signal sampling branch comprising a second electronic switch, and a sampling resistor. A controller unit controls the first electronic switch and the second electronic switch to be switched on so as to obtain grounding insulation signals of an IT system. The insulation monitoring apparatus can realize insulation monitoring of a single-phase AC IT system without injection of additional independent signals, can accurately calculate respective grounding insulation resistance values of two buses of the single-phase AC IT system, and can also determine the insulation deterioration degrees of the buses apart from monitoring short-circuit faults.

Description

Single phase ac IT system insulation monitoring and warning device
Technical field
The present invention relates to a kind of Circuits System insulation monitoring and warning device, especially a kind of single phase ac IT system insulating monitoring dress Put.
Background technology
In current IT system insulated on-line monitoring, the widely used detection method based on Injection Signal, noted by collection Enter the voltage of sampling resistor during signal or the electric current on IT system bus, when IT system shorted to earth or insulation degradation, Its insulation against ground resistance declines, fault signature in the voltage on sampling resistor during Injection Signal or the electric current on IT system bus Amount increases severely, and can be judged accordingly.Using during injecting signal monitoring IT system insulation, no matter injection is direct current signal, list Frequency AC signal, or double frequency AC signal, are required for 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 to fault characteristic value and failure line selection positioning bring difficulty.
Content of the invention
In order to solve problem present in IT system insulated on-line monitoring, the invention provides a kind of single phase ac IT system Insulation monitoring and warning device, including controller unit, zero passage detection unit, insulating signal sampling unit, crest voltage sampling unit.
Described zero passage detection unit is used for obtaining the zero crossing of bus alternating voltage and delivering to controller unit, crest voltage Sampling unit is used for obtaining the peak signal of bus alternating voltage and delivering to controller unit, and insulating signal sampling unit is used for obtaining Take the insulation against ground signal of IT system and deliver to controller unit.
Described insulating signal sampling unit includes the first sample of signal branch road, secondary signal sampling slip and sampling electricity Resistance；First sample of signal branch road includes the first electronic switch, the first current-limiting resistance being connected in series, the first electronic switch, first The order that is connected in series of current-limiting resistance arbitrarily selects；The second electronic switch that secondary signal sampling slip includes being connected in series, Two current-limiting resistances, the second electronic switch, the order that is connected in series of the second current-limiting resistance arbitrarily select；First sample of signal branch road One end connects to the first bus of IT system, and one end of secondary signal sampling slip connects to the second bus of IT system；First The other end of sample of signal branch road, the other end of secondary signal sampling slip are connected with one end of sample resistance, sampling electricity The other end of resistance connects to protecting field.
The insulation against ground signal of described IT system is the first bus burst pulse voltage, the second bus burst pulse electricity over the ground over the ground Pressure, controls the first electronic switch, the second electronic switch pulsed to open acquisition by controller unit respectively.
Described first electronic switch, the second electronic switch are interval in the peak value of the positive and negative half-wave of bus alternating voltage respectively Open-minded, or respectively in the peak value release of section of the negative, positive half-wave of bus alternating voltage.
Described first sample of signal branch road also includes the first diode connected, and described secondary signal sampling slip also includes Second diode of series connection；First diode makes the first electronic switch open-minded in bus alternating voltage a half-wave, the Two diodes make the second electronic switch open-minded in the another one half-wave of bus alternating voltage.Described first sample of signal is propped up Road also includes the 3rd diode, and described secondary signal sampling slip also includes the 4th diode；Described 3rd diode reverse is simultaneously It is associated on the first electronic switch, the 4th diode reverse is connected in parallel on the second electronic switch.Diode reverse is connected in parallel on electronic cutting Shut, the negative electrode referring to diode connects to the electric current inflow end of electronic switch, and anode connects to the electric current stream of electronic switch Go out end.
Described first electronic switch, the second electronic switch can also be respectively at the peaks of the different positive half-waves of bus alternating voltage Value release of section, or respectively in the peak value release of section of the negative half-wave of difference of bus alternating voltage.
First bus insulation against ground resistance RF1, the second bus insulation against ground resistance RF2According to formula
Calculated, wherein, REResistance value for the first current-limiting resistance and the second current-limiting resistance；RSElectricity for sample resistance Resistance；UmPeak value for bus alternating voltage；U1The first bus burst pulse voltage over the ground when opening for the first electronic switch, U2 The second bus burst pulse voltage over the ground when opening for the second electronic switch.
Described U1、U2According to formula
Calculated, wherein, UC1Sample resistance R when opening for the first electronic switchSOn voltage, UC2For the second electronic cutting Sample resistance R when pass is openedSOn voltage.
The concrete steps that controller unit realizes insulating monitoring include：
Step one, sampling obtain burst pulse voltage, the second bus burst pulse voltage and the bus friendship over the ground over the ground of the first bus The peak value of stream voltage；
Step 2, calculating the first bus insulation against ground resistance and the second bus insulation against ground resistance；
Step 3, result treatment；
Step 4, return to step one.
Sampling obtains the first bus burst pulse voltage, the second bus burst pulse voltage and bus alternating voltage over the ground over the ground During peak value, sampling order can arbitrarily select.
In step one, sampling obtains the first bus burst pulse voltage, the second bus burst pulse voltage and bus over the ground over the ground During the peak value of alternating voltage, can be using unitary sampling value it is also possible to select multiple repairing weld more multiple sampled values to be included Ask arithmetic mean of instantaneous value, median, sliding average, median mean value, or tied after the data processing of other modes Fruit is worth.Can also select multiple repairing weld more multiple sampled values are carried out including ask arithmetic mean of instantaneous value, median, sliding average, Median mean value, or after the data processing of other modes, obtain end value.
Calculate in step 2 and obtain the first bus insulation against ground resistance RF1With the second bus insulation against ground resistance RF2, permissible Select using the first bus insulation against ground resistance R calculating acquisition after single execution step one and step 2F1With the second bus pair Ground insulaion resistance RF2It is also possible to selecting execution step one and step 2 are repeated several times, obtaining multiple first bus insulation against ground electricity Resistance RF1With the second bus insulation against ground resistance RF2Calculated value after, more multiple calculated values are carried out including ask arithmetic mean of instantaneous value, in Place value, sliding average, median mean value, or the end value obtaining after the data processing of other modes.
Described single phase ac IT system insulation monitoring and warning device can also include alarm unit, man-machine interaction unit, verification list One of unit unit or multiple unit.
The invention has the beneficial effects as follows：(1) additional independent signal need not be injected, you can realize to single phase ac IT system Insulating monitoring；(2) monitoring signals are direct current burst pulse voltage, can eliminate the shadow that bus direct-to-ground capacitance is monitored to insulaion resistance Ring；(3) the respective insulation against ground resistance value of 2 buses of single phase ac IT system can accurately be calculated, except short circuit can be monitored Additionally it is possible to judge the degree of bus insulation deterioration outside fault.
Brief description
Fig. 1 is single phase ac IT system insulation monitoring and warning device embodiment composition frame chart；
Fig. 2 is insulating signal sampling unit embodiment circuit theory diagrams；
Equivalent circuit diagram when Fig. 3 opens for insulating signal sampling unit embodiment the first electronic switch；
Equivalent circuit diagram when Fig. 4 opens for insulating signal sampling unit embodiment the second electronic switch；
Fig. 5 is bus alternating voltage waveform and zero-crossing pulse schematic diagram.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
It is illustrated in figure 1 single phase ac IT system insulation monitoring and warning device embodiment composition frame chart.Fig. 1 embodiment includes controlling Device unit 100, zero passage detection unit 200, insulating signal sampling unit 300, crest voltage sampling unit 400, verification unit 500th, alarm unit 600, man-machine interaction unit 700.L1, L2 are respectively the first bus of single phase ac IT system, the second bus； PE is protection conductor or the protecting field of IT system.
It is illustrated in figure 2 insulating signal sampling unit embodiment circuit theory diagrams, including the first electronic switch M1, the second electricity Son switch M2, the first current-limiting resistance RE1, the second current-limiting resistance RE2, sample resistance RS, the first diode D1, the second diode D2, 3rd diode D3, the 4th diode D4；First electronic switch M1, the first current-limiting resistance RE1, the first diode D1, the three or two pole Pipe D3 forms the first sample of signal branch road, the second electronic switch M2, the second current-limiting resistance RE2, the second diode D2, the four or two pole Pipe D4 forms secondary signal sampling slip.In Fig. 2, RF1、RF2It is respectively the insulation against ground electricity of the first bus L1, the second bus L2 Resistance；K1, K2 are respectively the first electronic switch M1, the control signal of the second electronic switch M2, and K1, K2 are derived from controller unit.The One electronic switch, the second electronic switch are full-control type electronic switch, and in Fig. 2 embodiment, M1, M2 adopt triode type photoelectric coupling Device.First electronic switch, the second electronic switch can also be replaced with DC solid-state relay or other full-control type electronic switches Change.
In Fig. 2 embodiment, the 3rd diode D3, the 4th diode D4 protect the first electronic switch M1, the second electronics respectively Switch M2 is so as to exempt from too high backward voltage；When the first electronic switch, the second electronic switch can bear the anti-of place circuit During to voltage, the 3rd diode, the 4th diode are not necessarily.
In Fig. 2 embodiment, it can only be higher than second in the first bus L1 current potential that the first diode D1 makes the first electronic switch M1 Open-minded during bus L2 current potential, the second diode D2 makes the second electronic switch M2 can only be less than the second bus in the first bus L1 current potential Open-minded during L2 current potential；When the first electronic switch, the second electronic switch have one-way conduction performance and do not have the 3rd diode in parallel, During four diodes, the first diode, the second diode are not necessarily.
First electronic switch and the second electronic switch be the short time, pulsed open-minded, and the first electronic switch and Second electronic switch can not be opened simultaneously and turn on.It is higher than the second mother that first electronic switch can control in the first bus L1 current potential Open during line L2 current potential it is also possible to control open-minded when the first bus L1 current potential is less than the second bus L2 current potential；Similarly, second Electronic switch can control to be opened it is also possible to control in the first bus when the first bus L1 current potential is higher than the second bus L2 current potential L1 current potential is less than open-minded during the second bus L2 current potential.First electronic switch, the second electronic switch can be respectively in bus alternating currents The positive and negative half-wave of pressure is open-minded or open-minded in the negative, positive half-wave of bus alternating voltage respectively；First electronic switch, the second electricity Son switch can also be open-minded in the different positive half-waves of bus alternating voltage respectively, or respectively in the difference of bus alternating voltage Negative half-wave is open-minded.
Will be complete to the first diode D1 in Fig. 2 embodiment, the second diode D2, the 3rd diode D3, the 4th diode D4 Portion's Opposite direction connection, the first electronic switch M1, the sense of current Opposite direction connection of the second electronic switch M2, then the first diode D1 make One electronic switch M1 can only be open-minded when the first bus L1 current potential is less than the second bus L2 current potential, and the second diode D2 makes the second electricity Son switch M2 can only be open-minded when the first bus L1 current potential is higher than the second bus L2 current potential.
It is illustrated in figure 3 equivalent circuit diagram when insulating signal sampling unit embodiment the first electronic switch is opened.
When first electronic switch M1 opens, the first bus L1 current potential is higher than the second bus L2 current potential, the voltage between L1, L2 For monitoring burst pulse voltage Um.Make R0=RE1+RS, R4For R0With RF1Resistance value in parallel, then now the first bus burst pulse over the ground Voltage U1For
Will
Substitution formula (1) simultaneously arranges, and has
It is illustrated in figure 4 equivalent circuit diagram when insulating signal sampling unit embodiment the second electronic switch is opened.Second When electronic switch M2 opens, the first bus L1 current potential is less than the second bus L2 current potential.Phase when the second electronic switch M2 opens Phase angle when parallactic angle is opened with the first electronic switch M1 is identical, and the monitoring burst pulse voltage between L2, L1 is Um.When the first electricity The first bus that son switch, the second electronic switch are opened burst pulse voltage, the second bus burst pulse voltage position respectively over the ground over the ground When the peak value of 2 half-waves of bus alternating voltage is interval, UmPeak value for bus alternating voltage.
Work as RE2Resistance value be equal to RE1Resistance value when, have R0=RE2+RS, then now the second bus burst pulse voltage over the ground U2For
According to formula (2) and formula (3), can obtain
Joint arrangement formula (2), formula (3), formula (4), have
Make the first current-limiting resistance RE1With the second current-limiting resistance RE2Resistance value be RE, have
One of insulation against ground signal of IT system, the first bus burst pulse voltage U over the ground1By gathering the first electronic switch Sample resistance R when M1 opensSOn voltage UC1Obtain；The two of the insulation against ground signal of IT system, the second bus burst pulse over the ground Voltage U2Sample resistance R when being opened by gathering the second electronic switch M2SOn voltage UC2Obtain, and have
For limit the first electronic switch or when the second electronic switch opens the first bus or the second bus electricity over the ground Stream, the first current-limiting resistance RE1With the second current-limiting resistance RE2Resistance value be preferably greater than 500k Ω, particularly preferably its resistance value is big In 2M Ω.
It is illustrated in figure 5 bus alternating voltage waveform and zero-crossing pulse schematic diagram.Fig. 5 (a) show bus alternating voltage, The i.e. alternating voltage waveform to the second bus L2 for the first bus L1.Fig. 5 (b) show square wave formula zero-crossing pulse, to Fig. 5 (a) institute Oscillography shape is directly compared using comparator and can get.The rising of square wave formula zero-crossing pulse, 2 edges of decline correspond to figure Positive and negative zero passage (or the negative, positive zero passage) point of alternating voltage waveform shown in 5 (a), just can individually obtain alternating voltage waveform Zero crossing or negative zero crossing are it is also possible to obtain the positive zero crossing of alternating voltage waveform and negative zero crossing simultaneously.Shown in Fig. 5 (c) For burst pulse formula zero-crossing pulse, can get to being compared using comparator again after wave rectification shown in Fig. 5 (a).Burst pulse Each burst pulse of formula zero-crossing pulse represents the zero crossing of 1 alternating voltage waveform, but can not carry out area to positive and negative zero crossing Point.Waveform shown in Fig. 5 (a) is directly compared using comparator and obtains the zero-crossing pulse of square wave formula shown in Fig. 5 (b), or Obtain the zero-crossing pulse of burst pulse formula shown in Fig. 5 (c) to being compared using comparator again after wave rectification shown in Fig. 5 (a), for this The routine techniques that skilled artisan is grasped.
In Fig. 5 (a), T1The time postponing with respect to zero crossing for the first electronic switch M1, the second electronic switch M2, T2For The time that first electronic switch M1, the second electronic switch M2 open.If the cycle of bus alternating voltage is T, when the first electronic cutting Pass M1, the second electronic switch M2 are engraved at the peak value of bus alternating voltage and T when opening2It is sufficiently small, as pulsed is opened Logical, further, when
When, then the monitoring burst pulse voltage U between L2, L1 when the first electronic switch M1, the second electronic switch M2 openmFor The crest voltage of bus alternating voltage.
First electronic switch M1 or the second electronic switch M2 service time T2Short, now it is carried in the first bus and second Monitoring burst pulse voltage on the loop being formed between bus, by PE is the equal of direct current burst pulse voltage, because first is female Line, the second bus direct-to-ground capacitance little, to sample resistance RSOn voltage when being sampled, it is right that direct current burst pulse voltage has completed The discharge and recharge of direct-to-ground capacitance, can avoid the first bus, the direct-to-ground capacitance of the second bus that insulating monitoring is impacted.
When the supply frequency of bus alternating voltage is high, its cycle T is little, for keeping the first electronic switch M1 or second electricity When son switch M2 opens, direct current burst pulse magnitude of voltage is basically unchanged, correspondingly, service time T2Must be shorter.When bus alternating current When the supply frequency of pressure is less than 300Hz, keep the service time T that direct current burst pulse magnitude of voltage is basically unchanged2Within, can be complete The in pairs discharge and recharge of direct-to-ground capacitance and to sample resistance RSOn voltage sampled.
Crest voltage sampling unit is used for obtaining the peak signal of bus alternating voltage and delivering to controller unit.Peak value electricity One of embodiment of pressure sampling unit is bus alternating voltage bleeder circuit, and controller unit is in the peak value of bus alternating voltage Carve the output to bus alternating voltage bleeder circuit to sample, you can obtain the peak value of bus alternating voltage.Obtaining mother In the case of the zero-crossing pulse of line alternating voltage, the zero crossing of known bus alternating voltage, how controller unit is handed in bus Stream voltage peak value moment the output of bus alternating voltage bleeder circuit is carried out sample obtain bus alternating voltage peak value be The routine techniques that professional and technical personnel in the field are grasped.
When the insulation against ground of IT system deteriorates or has shorted to earth fault, bus insulation against ground resistance is less than the threshold setting During value resistance, controller unit is reported to the police by alarm unit.Man-machine interaction unit is used for realizing setting, first mother of threshold resistance Line, the second bus insulation against ground resistance value such as show at the function.The design of alarm unit and man-machine interaction unit and required function Realization is the routine techniques that professional and technical personnel in the field are grasped.
Verification unit is used for carrying out function check to described single phase ac IT system insulation monitoring and warning device.Implement shown in Fig. 1 In example, verification unit 500 is controlled by controller unit by man-machine interaction unit.Verification unit can also be directly by man-machine Interactive unit controls, and is directly controlled by switch, button.When carrying out function check, verification unit is in the first bus and guarantor Between shield ground, or between the second bus and protecting field, or simultaneously between the first bus and protecting field and second Verification resistance is accessed, whether finder being capable of normal work between bus and protecting field.Directly by switch, button control the Between one bus and protecting field, or between the second bus and protecting field, or simultaneously in the first bus and protecting field Between access verification resistance and the second bus and protecting field between, and controlled by controller unit by man-machine interaction unit System between the first bus and protecting field, or between the second bus and protecting field, or simultaneously the first bus with Accessing verification resistance between protecting field and the second bus and protecting field between is the routine that professional and technical personnel in the field are grasped Technology.
Controller unit includes the functional module such as MCU and A/D converter, signal conditioning circuit and circuit.Crest voltage The peak signal of bus alternating voltage of sampling unit output, the insulation against ground signal of insulating signal sampling unit output are through signal Modulate circuit delivers to A/D converter after processing, and A/D converter output data transfers to MCU process.MCU is single with insulating signal sampling Unit, zero passage detection unit, verification unit, alarm unit, man-machine interaction unit etc. have electrical connection, to carry out the information of correlation Transmission.Control core MCU can select the microcontroller such as DSP, ARM, single-chip microcomputer, CPLD, PLC or control device.How to select Select and use A/D converter, and how modelled signal modulate circuit makes crest voltage sampling unit, insulating signal sampling unit The signal of output meets the requirement to signal input for the A/D converter, is the routine techniques that professional and technical personnel in the field are grasped.
The concrete steps that controller unit realizes single phase ac IT system insulating monitoring include：
Step one, sampling obtain the voltage U of burst pulse over the ground of 2 half-waves of bus alternating voltage1、U2With bus alternating voltage Peak value Um；
Step 2, calculating obtain the first bus insulation against ground resistance RF1With the second bus insulation against ground resistance RF2；
Step 3, result show and alert process；
Step 4, return to step one.
Sampling obtains the voltage U of burst pulse over the ground of 2 half-waves of bus alternating voltage1、U2Peak value U with bus alternating voltagem When, to U1、U2、UmSampling order can arbitrarily arrange.
To U1、U2、UmWhen being sampled, it is required for calculating sampling instant according to zero crossing；U1、U2、UmRespective zero passage Point can be determined it is also possible to by the zero passage arteries and veins before the half-wave of sampled signal place by the zero-crossing pulse of sampled signal place half-wave Bring reckoning to determine.The cycle T of bus alternating voltage calculates according to the zero-crossing pulse that zero passage detection unit exports.
In step one, sampling obtains the voltage U of burst pulse over the ground of 2 half-waves of bus alternating voltage1、U2With bus alternating voltage Peak value UmWhen, can select using unitary sampling value it is also possible to select multiple repairing weld more multiple sampled values to be carried out including asking Arithmetic mean of instantaneous value, median, sliding average, median mean value, or after the data processing of other modes, obtain result Value.
Calculate in step 2 and obtain the first bus insulation against ground resistance RF1With the second bus insulation against ground resistance RF2, permissible Select using the first bus insulation against ground resistance R calculating acquisition after single execution step one and step 2F1With the second bus pair Ground insulaion resistance RF2It is also possible to selecting execution step one and step 2 are repeated several times, obtaining multiple first bus insulation against ground electricity Resistance RF1With the second bus insulation against ground resistance RF2Calculated value after, more multiple calculated values are carried out including ask arithmetic mean of instantaneous value, in Place value, sliding average, median mean value, or the end value obtaining after the data processing of other modes.
Described device also includes DC power source unit.DC power source unit can be using external power supply it is also possible to by bus Alternating voltage step-down, rectification, filtering, obtain after voltage stabilizing.

Claims (10)

1. a kind of single phase ac IT system insulation monitoring and warning device it is characterised in that：Including controller unit, zero passage detection unit, Insulating signal sampling unit, crest voltage sampling unit；
Described zero passage detection unit is used for obtaining the zero crossing of bus alternating voltage and delivering to controller unit；
Described crest voltage sampling unit is used for obtaining the peak signal of bus alternating voltage and delivering to controller unit；
Described insulating signal sampling unit is used for obtaining the insulation against ground signal of IT system and delivering to controller unit.
2. single phase ac IT system insulation monitoring and warning device according to claim 1 it is characterised in that：Described insulating signal takes Sample unit includes the first sample of signal branch road, secondary signal sampling slip and sample resistance；First sample of signal branch road includes The first electronic switch of being connected in series, the first current-limiting resistance, secondary signal sampling slip includes the second electronic cutting being connected in series Pass, the second current-limiting resistance；One end of first sample of signal branch road connects to the first bus of IT system, secondary signal sampling slip One end connect to the second bus of IT system；The other end of the first sample of signal branch road, secondary signal sampling slip another Outer one end is connected with one end of sample resistance, and the other end of sample resistance connects to protecting field.
3. single phase ac IT system insulation monitoring and warning device according to claim 2 it is characterised in that：Described IT system right Ground insulating signal is the first bus burst pulse voltage, the second bus burst pulse voltage over the ground over the ground, is controlled respectively by controller unit Make the first electronic switch, the second electronic switch pulsed opens acquisition.
4. single phase ac IT system insulation monitoring and warning device according to claim 3 it is characterised in that：Described first electronic cutting Close, the second electronic switch is handed over respectively in the peak value release of section of the positive and negative half-wave of bus alternating voltage, or respectively in bus The peak value release of section of the negative, positive half-wave of stream voltage.
5. single phase ac IT system insulation monitoring and warning device according to claim 4 it is characterised in that：Described first signal takes Sample branch road also includes the first diode connected, and described secondary signal sampling slip also includes the second diode connected；First Diode makes the first electronic switch open-minded in bus alternating voltage a half-wave, and the second diode makes the second electronic switch Can only be open-minded in the another one half-wave of bus alternating voltage.
6. single phase ac IT system insulation monitoring and warning device according to claim 5 it is characterised in that：Described first signal takes Sample branch road also includes the 3rd diode, and described secondary signal sampling slip also includes the 4th diode；Described 3rd diode is anti- To being connected in parallel on the first electronic switch, the 4th diode reverse is connected in parallel on the second electronic switch.
7. single phase ac IT system insulation monitoring and warning device according to claim 3 it is characterised in that：Described first electronic cutting Close, the second electronic switch respectively in the peak value release of section of the different positive half-waves of bus alternating voltage, or respectively in bus The difference of alternating voltage bears the peak value release of section of half-wave.
8. the single phase ac IT system insulation monitoring and warning device according to any one of claim 4-7 it is characterised in that：The One bus insulation against ground resistance RF1, the second bus insulation against ground resistance RF2According to formula
R F 1 = U m - U 1 - U 2 U 2 · ( R E + R S ) R F 2 = U m - U 1 - U 2 U 1 · ( R E + R S )
Calculated, wherein, REResistance value for the first current-limiting resistance and the second current-limiting resistance；RSResistance value for sample resistance； UmPeak value for bus alternating voltage；U1First bus burst pulse voltage over the ground, U when opening for the first electronic switch2For the second electricity Second bus burst pulse voltage over the ground when son is opened.
9. single phase ac IT system insulation monitoring and warning device according to claim 8 it is characterised in that：Described U1、U2According to formula
U 1 = R E + R S R S · U C 1 U 2 = R E + R S R S · U C 2
Calculated, wherein, UC1Sample resistance R when opening for the first electronic switchSOn voltage, UC2Open for the second electronic switch Sample resistance R when logicalSOn voltage.
10. single phase ac IT system insulation monitoring and warning device according to claim 9 it is characterised in that：Controller unit is real The concrete steps of existing insulating monitoring include：
Step one, sampling obtain the first bus burst pulse voltage, the second bus burst pulse voltage and bus alternating current over the ground over the ground The peak value of pressure；
Step 2, calculating obtain the first bus insulation against ground resistance and the second bus insulation against ground resistance；
Step 3, result treatment；
Step 4, return to step one.
CN201610894550.1A 2016-10-13 2016-10-13 Single-phase AC IT system insulation monitoring apparatus Pending CN106443384A (en)

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US20130088240A1 (en) * 2011-10-10 2013-04-11 Wolfgang Hofheinz Method and apparatus for determining an insulation resistance in grounded it systems
CN203519754U (en) * 2013-08-16 2014-04-02 中工国际工程股份有限公司 Insulation monitoring device of ac power supply system
CN204028287U (en) * 2014-08-07 2014-12-17 安科瑞电气股份有限公司 A kind of interchange IT system insulating monitor

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Publication number Priority date Publication date Assignee Title
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