CN105259416B - A kind of insulation resistance detector and its detection method applied to IT system - Google Patents
A kind of insulation resistance detector and its detection method applied to IT system Download PDFInfo
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Abstract
The present invention relates to a kind of insulation resistance detector and its detection method applied to IT system, including controllable pulse generator and DC voltage generator, follower, low pass filter, controllable double sampled retainer, difference amplifier, MCU and sampling network, controllable pulse generator connects sampling microwave network with DC voltage generator, the sampling microwave network is sequentially connected in series follower, low pass filter, controllable double sampled retainer, difference amplifier and MCU, the MCU connects controllable pulse generator and DC voltage generator by data wire respectively, low pass filter and controllable double sampled retainer.The present invention has wide range of applications, effect is good, it can be applicable to the ac grid system of the pulsation of extremely low frequency, can also be simultaneously using low-frequency pulse probe method and the circuit of direct voltage method, by the selection use of two kinds of method of testings can widen can examining system frequency range, can be applied in the AC system of higher voltage.
Description
Technical field
The invention belongs to insulaion resistance detection field, is related to the insulaion resistance detection applied to IT system, especially a kind of
Insulation resistance detector and its detection method applied to IT system.
Background technology
Traditional insulation resistance detection device, mainly there are bridge method, current sensor method of testing, adaptive impulse method.Its
In, bridge method is only suitable for direct current IT system, and measurement accuracy is relatively low, and interference rejection ability is poor, narrow range, bridge method and current sensor
Detection method is required for from system under test (SUT) power taking signal, and measurement accuracy and scope are limited by system under test (SUT), and adaptive pulse method
There is testing blind zone, the measurement accuracy of relatively low frequency range IT system can be affected or can not detect at all.Above method
Direct current IT system is can be only applied to, otherwise blind area, i.e., frequency model relatively low to system be present to the IT system of AC ripple
Enclose, it is impossible to accurately test out insulating resistance value.In addition, traditional insulation detector, the voltage class of test is limited, often not
The insulaion resistance of higher voltage class system can be measured.
The disclosed patent document of analogous technical fields is found by retrieval：
A kind of DC electrical system insulaion resistance detection and earth protective device (CN103701092A), including detection signal
Source module, multiple signal couplers, drain transformer, multiple residual current sensors, multiple phase-sensitive rectifiers, multiple insulated electros
Hinder detector, multiple protection output units and capacitance.Detection signal source module signal bus and signal coupler after testing
Connection；Detection signal source module connects the positive and negative main bus-bar of DC electrical system through drain transformer；Residual current sensor connects
Phase-sensitive rectifier input is connect, the control terminal of phase-sensitive rectifier is connected with detection signal bus, phase-sensitive rectifier and insulated electro
Resistance detector connects with protection output unit, and insulation resistance detector and protection output unit are connected with detection signal bus respectively
Connect.Insulation reduction and earth fault of the present invention to protection domain have reliable selectivity and accuracy.
Comparative analysis, the published patented technology of the above and known public technology are claimed with present patent application
Technology it is different, and there is also difference for caused technique effect.
The content of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, there is provided a kind of simple in construction, detection is accurately, fast
Efficiently, the reliable and stable insulation resistance detector and its detection method applied to IT system.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of insulation resistance detector applied to IT system, it is characterised in that：Including controllable voltage generator, follow
Device, low pass filter, controllable double sampled retainer, difference amplifier, MCU and sampling network, controllable voltage occur
Device connects sampling microwave network, and the sampling microwave network is sequentially connected in series follower, low pass filter, controllable double sampled retainer, difference and put
Big device and MCU, the MCU connect controllable voltage generator, low pass filter and controllable double sampled by data wire respectively
Retainer, MCU are also associated with input/output terminal.
Moreover, the controllable voltage generator includes controlling switch k21 and k22, controlled by controlling switch k21 and k22
Uo is exported, obtains ± Un pulse signal either+Un or-Un d. c. voltage signals.
Moreover, the sampling microwave network includes the inductor and resistor R1, R2, R3 being sequentially connected in series, AC high-voltage power supplies are shared
Voltage；R1, R2 are equivalent resistor, and R3 is small resistor.
Moreover, the inductor is by being being composed in series for multiple inductors.
Moreover, the concrete structure of the controllable double sampled retainer, including three gate-controlled switch devices controlled by MCU
K31, k32 and k33, memory cell C1 and C2, and follower B1 and follower B2, the derailing switch k31, memory cell C1 with
And follower B1 forms one group of sampling hold circuit, the derailing switch k32, memory cell C2 and follower B2 form another group
Sampling hold circuit, one controlling switch k33 of B2 parallel connections in the sampling hold circuit；Two groups of sampling hold circuits are in parallel,
Output voltage signal u1 and u2 are corresponded to respectively.
Moreover, the input/output terminal includes display, sets device and switching value circuit.
Moreover, using low-frequency pulse probe method：
(1) voltage signal is produced, and MCU is believed with the signal control controllable voltage generator generation ± Un of low frequency voltage
Number；
(2) sample of signal, the sampling microwave network that the signal is connected by L1, R1, R2 sample；
For AC system, signal is generally higher than 50HZ, and L1 shares most of alternating voltage, now, ± Un voltage letter
Number be less than the 1HZ voltage signal frees of losses by inductor, and by resistor R1, R2, R3 partial pressure；
(3) signal controls the cut-off frequency of low pass filter, makes ± Un voltage signal lossless by low pass filter, MCU
Lose by filtering out the harassing and wrecking signal based on mains frequency；
(4) signal remembers positive arteries and veins by controllable double sampled retainer for the C1 of controllable double sampled retainer sampling holder
Rush Un generation t1 moment Un and network system caused by coefficient voltage u1, sampling holder C2 memory negative pulse-
Common effect u2 caused by the t2 moment-Un and network system that Un occurs；
(5) signal is difference amplifier by difference amplifier, the output Uo=K* (u1-u2) of difference amplifier, wherein K
Multiplication factor,
This Uo has eliminated the effect of AC or DC network systems, and Uo is proportional to the electric current that sample resistance R1, R2, R3 flow through
In；
(6) Re results are obtained：By calculating InIf Rn=In, Rn insulaion resistances Re and R1, R2, R3 series value, examined
Survey result Re=Rn-R1-R2-R3.
(7) alarm or indicate：After MCU calculates insulating resistance value, when alarming value thresholds of the Re less than setting, pass through display
Device or switching value circuit output are indicated.
Moreover, the step (3) in, the frequency of impulse generator is lower, and the cut-off frequency of low pass filter is also with drop
It is low.
Moreover, using direct voltage method：
(1) voltage signal is produced, and MCU control impulse generators only produce positive Un voltage signal；
(2) sample of signal, the sampling microwave network that the signal is connected by L1, R1, R2 sample；
(3) signal produces alap cut-off frequency by low pass filter, MCU control low pass filters, and Un is direct current
Signal can free of losses pass through；
(4) signal remembers positive arteries and veins by controllable double sampled retainer for the C1 of controllable double sampled retainer sampling holder
Rush Un generation t1 moment Un and network system caused by coefficient voltage u1, controlling switch K33 closure make u2=0；
(5) signal is difference amplifier by difference amplifier, the output Uo=K* (u1-u2) of difference amplifier, wherein K
Multiplication factor,
This Uo has eliminated the effect of AC or DC network systems, and Uo is proportional to the electric current that sample resistance R1, R2, R3 flow through
In；
(6) Re results are obtained：By calculating InIf Rn=In, Rn insulaion resistances Re and R1, R2, R3 series value, examined
Survey result Re=Rn-R1-R2-R3；
(7) alarm or indicate：MCU is alarmed and indicated after calculating insulating resistance value, when Re is less than the alarming value set
Threshold, indicated by display or switching value circuit output.
The advantages and positive effects of the present invention are：
The present invention has wide range of applications, and effect is good, can be applicable to the ac grid system of the pulsation of extremely low frequency, can also
The circuit of low-frequency pulse probe method and direct voltage method is respectively applied to, can be widened by the selection use of two kinds of method of testings
Can examining system frequency range, can be applied in the AC system of higher voltage.
Brief description of the drawings
Fig. 1 is insulation resistance detector theory structure block diagram；
Fig. 2 is controllable voltage generator；
Fig. 3 is controllable double sampled retainer.
Embodiment
Below in conjunction with the accompanying drawings and the invention will be further described by specific embodiment, and following examples are descriptive
, it is not limited, it is impossible to which protection scope of the present invention is limited with this.
A kind of insulation resistance detector applied to IT system, including controllable voltage generator A1, follower A2, low pass filtered
Ripple device A3, controllable double sampled retainer A4, difference amplifier A5, MCU A6 and sampling network A7, controllable electric pressure
Its caused signal is applied on sampling microwave network by raw device connection sampling microwave network, the controllable voltage generator, and sampling microwave network is successively
Connect follower, low pass filter, controllable double sampled retainer, difference amplifier and MCU, and the MCU passes through data wire point
Not Lian Jie controllable voltage generator, low pass filter and controllable double sampled retainer, also, MCU is also associated with showing, set
Put, the circuit such as switching value；
Referring to shown in accompanying drawing 1, insulaion resistance detection is actually to obtain AC and/or DC systems to the equivalent of the earth
The Re1 or Re2 shown in insulating resistance value Re, i.e. accompanying drawing.
Controllable voltage generator concrete structure is shown referring to accompanying drawing 2, Uo is exported by controlling switch k21 and k22, can be obtained
To ± Un pulse signal either+Un or-Un d. c. voltage signals.
It show the concrete structure of controllable double sampled retainer referring to accompanying drawing 3, including three controllable the opening by MCU controls
Close device k31, k32 and k33, memory cell C1 and C2, and follower B1 and follower B2, the derailing switch k31, memory cell
C1 and follower B1 forms one group of sampling hold circuit, and the derailing switch k32, memory cell C2 and follower B2 compositions are another
One group of sampling hold circuit, two groups of sampling hold circuits are in parallel, correspond to output voltage signal u1 and u2 respectively；MCU passes through control
System switch k31 and k32, so as to obtain the voltage signal u1 and u2 at different moments on same circuit.Protected in another group of sampling
Hold the B2 controlling switch k33 controlled by MCU in parallel in circuit, when k33 is closed, u2 0.
Critical piece illustrates：
A1 controllable voltage generators, controllable frequency and positive negative pulse stuffing is occurred by MCU controls, also can only be produced positive
Or negative DC voltage；
A2 followers, keep signal undistorted；
For A3 low pass filters using the controllable low pass filter of filter cutoff frequency, the low pass filter cutoff frequency should
Exchange ac power system frequency less than 1/10；
Double sampled retainer controllable A4, MCU controls A4 obtains the signal u1 that t1 moment positive pulses act on system, then obtains
To the signal u2 of t2 moment negative pulse effect；
A5 difference amplifiers, the signal delta u of u1 and u2 difference correlation connection is obtained through difference amplifier；
A6MCU AD channel reception Δs u is sampled；The circuits such as the display of MCU controls simultaneously, setting, switching value, once Re
, can be by indicating circuit or switching value output circuit output indication less than alarm threshold, it can be the energy such as keyboard to set device
Enough operation setting alarm threshold values.
A7 sampling microwave networks, comprising inductor L1, resistor R1, R2, R3, inductor shares most of electricity of AC high-voltage power supplies
Pressure, inductance value should be sufficiently large, and L1 can be the series connection of multiple inductors；R1, R2 shown in the present embodiment are equivalent resistor,
Most of DC voltage is shared, R1, R2 can also use multiple resistant series；R3 is small resistor, and main function is sampled signal.
Inductor L1 is effective for ac grid system, and the electricity of higher alternating voltage can be adapted to by increasing L1 inductance value
Net system.
The detection method of above-mentioned detector, insulaion resistance Re as shown in Figure 1 is obtained, there can be following two method：
The low-frequency pulse probe method of method one
(1) voltage signal is produced, and MCU is believed with the signal control controllable voltage generator generation ± Un of low frequency voltage
Number；
(2) sample of signal, the sampling microwave network that the signal is connected by L1, R1, R2 sample；It is general for AC system, signal
More than 50HZ, L1 shares most of alternating voltage, and now, ± Un voltage signal is less than leading to for the 1HZ voltage signal frees of losses
Inductor is crossed, by resistor R1, R2, R3 partial pressure；
(3) signal controls the cut-off frequency of low pass filter by low pass filter, MCU, and main purpose is controllable electric to be allowed
Press generator generation ± Un voltage signal free of losses by and filtering out the harassing and wrecking signal based on mains frequency；
The frequency of impulse generator is lower, and the cut-off frequency of low pass filter is also with reduction；
(4) signal is by controllable double sampled retainer, for controllable double sampled retainer sampling holder C1 " memory " just
Coefficient voltage u1 caused by the t1 moment Un and network system that pulse Un occurs, the C2 " memory " of sampling holder bear arteries and veins
Common effect u2 caused by the t2 moment-Un and network system that punching-Un occurs；
(5) signal is difference amplifier by difference amplifier, the output Uo=K* (u1-u2) of difference amplifier, wherein K
Multiplication factor, this Uo eliminated the effect of AC or DC network systems, and Uo is proportional to what sample resistance R1, R2, R3 flowed through
Electric current In；
(6) Re results are obtained：Pass through calculatingIfRn insulaion resistances Re and R1, R2, R3 series value, are obtained
Obtain testing result Re=Rn-R1-R2-R3.
When alarming value thresholds of the Re less than setting, can be indicated by display or output switch parameter.
The direct voltage method of method two
MCU control impulse generators only produce positive Un voltage signal；
MCU control low pass filters produce alap cut-off frequency, Un be direct current signal can free of losses pass through；
MCU controls the switch K33 closures of controllable double sampled retainer, makes u2=0；
Other obtain testing result Re=Rn-R1-R2-R3 with method one.
Method one is applied to most of occasions, is not suitable for the system close to the low-frequency pulse frequency of its own transmission, such as small
In 50HZ system；
Method two is adapted to pure AC system, including especially low frequency system, is, for example, less than 50HZ system, but is not suitable for
There is the network system of DC component.
Although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration, those skilled in the art can manage
Solution：Do not departing from the present invention and spirit and scope of the appended claims in, it is various replace, change and modifications all be it is possible,
Therefore, the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.
Claims (9)
- A kind of 1. insulation resistance detector applied to IT system, it is characterised in that：Including controllable voltage generator, follower, Low pass filter, controllable double sampled retainer, difference amplifier, MCU and sampling microwave network, controllable voltage generator connection take Sample network, the sampling microwave network be sequentially connected in series follower, low pass filter, controllable double sampled retainer, difference amplifier and MCU, the MCU connect controllable voltage generator, low pass filter and controllable double sampled retainer by data wire respectively, MCU is also associated with input/output terminal.
- 2. the insulation resistance detector according to claim 1 applied to IT system, it is characterised in that：The controllable voltage Generator includes controlling switch k21 and k22, controls output Uo by controlling switch k21 and k22, obtains ± Un pulse signal Either+Un or-Un d. c. voltage signals.
- 3. the insulation resistance detector according to claim 1 applied to IT system, it is characterised in that：The sampling microwave network Comprising the inductor L1 and resistor R1, R2, R3 being sequentially connected in series, the voltage of AC high-voltage power supplies is shared；R1, R2 are equivalent resistance Device, R3 are small resistor.
- 4. the insulation resistance detector according to claim 3 applied to IT system, it is characterised in that：The inductor by It is being composed in series for multiple inductors.
- 5. the insulation resistance detector according to claim 1 applied to IT system, it is characterised in that：Controllable pair The concrete structure of sampling holder, including three gate-controlled switch device k31, k32 and k33 by MCU controls, memory cell C1 and C2, and follower B1 and follower B2, the gate-controlled switch device k31, memory cell C1 and follower B1 form one group and adopted Sample holding circuit, the gate-controlled switch device k32, memory cell C2 and follower B2 form another group of sampling hold circuit, should One gate-controlled switch device k33 of follower B2 parallel connections in sampling hold circuit；Two groups of sampling hold circuits are in parallel, correspond to respectively Output voltage signal u1 and u2.
- 6. the insulation resistance detector according to claim 1 applied to IT system, it is characterised in that：The input/defeated Going out terminal includes display, sets device and switching value circuit.
- 7. the detection method of the insulation resistance detector according to claim 5 applied to IT system, it is characterised in that：Adopt With low-frequency pulse probe method：(1) voltage signal is produced, and MCU is with the signal control controllable voltage generator generation ± Un of low frequency voltage signal；(2) sample of signal, the signal are sampled by inductor L1, resistor R1, resistor the R2 sampling microwave network connected；For AC system, signal is generally higher than 50HZ, and inductor L1 shares most of alternating voltage, now, ± Un voltage Signal be less than the 1HZ voltage signal frees of losses by inductor, and by resistor R1, R2, R3 partial pressure；(3) signal controls the cut-off frequency of low pass filter, makes ± Un voltage signal free of losses by low pass filter, MCU By filtering out the harassing and wrecking signal based on mains frequency；(4) signal is by controllable double sampled retainer, when remembering the t1 that positive pulse Un occurs for the C1 of controllable double sampled retainer Carve coefficient voltage u1 caused by Un and network system, the t2 moment that the C2 memory negative pulses-Un of sampling holder occurs- Coefficient voltage u2 caused by Un and network system；(5) for signal by difference amplifier, the output Uo=K* (u1-u2) of difference amplifier, wherein K are putting for difference amplifier Big multiple,This Uo has eliminated the effect of AC or DC network systems, and Uo is proportional to the electric current In that resistor R1, R2, R3 flow through；(6) Re results are obtained：Pass through calculatingIfRn is insulaion resistance Re and resistor R1, R2, R3 series value, Obtain testing result Re=Rn-R1-R2-R3；(7) alarm or indicate：After MCU calculates insulating resistance value, when Re is less than the alarming value threshold set, by display or Person's switching value circuit output is indicated.
- 8. the detection method of the insulation resistance detector according to claim 7 applied to IT system, it is characterised in that：Institute In stating step (3), the frequency of impulse generator is lower, and the cut-off frequency of low pass filter is also with reduction.
- 9. the detection method of the insulation resistance detector according to claim 5 applied to IT system, it is characterised in that：Adopt Use direct voltage method：(1) voltage signal is produced, and MCU control impulse generators only produce positive Un voltage signal；(2) sample of signal, the signal are sampled by inductor L1, resistor R1, resistor the R2 sampling microwave network connected；(3) signal produces alap cut-off frequency by low pass filter, MCU control low pass filters, and Un is direct current signal Can free of losses pass through；(4) signal is by controllable double sampled retainer, when remembering the t1 that positive pulse Un occurs for the C1 of controllable double sampled retainer Coefficient voltage u1 caused by Un and network system is carved, controlling switch K33 closures make u2=0；(5) for signal by difference amplifier, the output Uo=K* (u1-u2) of difference amplifier, wherein K are putting for difference amplifier Big multiple,This Uo has eliminated the effect of AC or DC network systems, and Uo is proportional to the electric current In that resistor R1, R2, R3 flow through；(6) Re results are obtained：Pass through calculatingIfRn is insulaion resistance Re and resistor R1, R2, R3 series value, Obtain testing result Re=Rn-R1-R2-R3；(7) alarm or indicate：MCU is alarmed and indicated after calculating insulating resistance value, when Re is less than the alarming value door set Sill, indicated by display or switching value circuit output.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546842A (en) * | 2016-10-13 | 2017-03-29 | 湖南工业大学 | The micro-capacitance sensor IT system quality of power supply and insulating properties monitoring device |
| CN106443383B (en) * | 2016-10-13 | 2019-03-01 | 湖南工业大学 | Three-phase and four-line IT system insulation performance monitoring method |
| CN106932645B (en) * | 2017-04-07 | 2023-05-16 | 天津天传新能源电气有限公司 | Insulation resistance detection circuit and detection method based on direct current IT system |
| CN111426881A (en) * | 2020-05-13 | 2020-07-17 | 常熟瑞特电气股份有限公司 | RIM type insulation monitoring method and device |
| CN111426882A (en) * | 2020-05-13 | 2020-07-17 | 常熟瑞特电气股份有限公司 | RIM type insulation monitoring system |
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Effective date of registration: 20201102 Address after: 300180, No. 174 Jintang Road, Hedong District, Tianjin Patentee after: TIANJIN RESEARCH INSTITUTE OF ELECTRIC SCIENCE Co.,Ltd. Patentee after: Tianjin Tianchuan electric drive Co.,Ltd. Patentee after: TIANJIN TRIED NEW ENERGY ELECTRIC Co.,Ltd. Address before: 300301, No. 5, building 188, No. 405, Binhai New Science Zone, Binhai new and high tech Zone, Binhai New Area, Tianjin, China Patentee before: TIANJIN TRIED NEW ENERGY ELECTRIC Co.,Ltd. Patentee before: TIANJIN RESEARCH INSTITUTE OF ELECTRIC SCIENCE Co.,Ltd. |
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