CN107015061A - The detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance - Google Patents
The detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance Download PDFInfo
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- CN107015061A CN107015061A CN201710142157.1A CN201710142157A CN107015061A CN 107015061 A CN107015061 A CN 107015061A CN 201710142157 A CN201710142157 A CN 201710142157A CN 107015061 A CN107015061 A CN 107015061A
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- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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Abstract
The invention provides the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance, belong to detection circuit field, provided with the sampling resistor and relay being sequentially connected in series between the both positive and negative polarity of multi-channel DC input power and ground；Two relays are closed respectively, break-make processing, get under different conditions that multi-channel dc power supply negative pole is relative to ground voltage value, it is determined that the mathematic(al) representation on ground insulation resistance, the scope of earth impedance is determined according to mathematic(al) representation.Before and after relay closure, sample two different voltages, by judge impedance ground whether be more than some value in the way of replace accurately calculate each dc source to impedance occurrence in the way of, simplify the detection mode of ground insulation resistance, the circuit structure of detection circuit has also been simplified simultaneously, reduces the cost of inverter and the triviality of detection circuit.
Description
Technical field
The invention belongs to detect the inspection of circuit field, more particularly to multi-channel DC input power both positive and negative polarity ground insulation resistance
Survey method.
Background technology
, it is necessary to which detection photovoltaic panel anode and negative terminal are prevented to the impedance between ground before output in photovoltaic DC-to-AC converter
Short circuit occurs for photovoltaic panel anode or negative terminal, to ensure that lives and properties are dangerous.It would generally can all be connected one on per input all the way
Relay is to ground, and the voltage change brought by relay on-off judges the size of impedance.So it is required for per input all the way
One relay could realize the function of insulation impedance detection.The road of the relay so needed when multichannel is inputted just with input
Number is as many.There is multichannel input, just may require that multiple relays, adding inverter cost and the triviality of circuit.
The content of the invention
In order to solve shortcoming and defect present in prior art, the invention provides for completing power supply by relay
Ground insulation resistance, so as to reduce the multi-channel DC input power both positive and negative polarity insulation against ground resistance of the circuit triviality of inverter cost
Anti- detection method.
In order to reach above-mentioned technical purpose, the invention provides multi-channel DC input power both positive and negative polarity ground insulation resistance
Detection method, is detected, the detection method for the earth impedance to multi-channel dc power supply, including：
Provided with the sampling resistor Ra and relay being sequentially connected in series between the positive pole of multi-channel DC input power and ground
RY1, provided with the sampling resistor Rb and relay RY2 being sequentially connected in series between the negative pole of multi-channel DC input power and ground；
Closing relay RY1, disconnects relay RY2, obtains on multi-channel dc power supply negative pole relative to ground voltage value
Vg1, formula one is determined according to magnitude of voltage Vg1；
Relay RY1, closing relay RY2 are disconnected, is obtained on multi-channel dc power supply negative pole relative to ground voltage value
Vg2, formula two is determined according to magnitude of voltage Vg2；
According to formula one and formula two, it is determined that the mathematic(al) representation on ground insulation resistance, true according to mathematic(al) representation
Determine the scope of earth impedance.
Optionally, in the multi-channel dc power supply：
Provided with n roads PV inputs, the ground insulation resistance of the positive and negative terminal of first via PV inputs is respectively R1+, R1-, the second tunnel
The ground insulation resistance of the positive and negative terminal of PV inputs is respectively R2+, R2-, and by that analogy, the positive and negative terminal of the n-th road PV inputs is over the ground
Insulation impedance is respectively Rn+, Rn-, because every road PV negative terminals inputted are connected in parallel, by R1-, R2-Rn parallel connection
Impedance is denoted as R-；
For n roads PV inputs per all the way, input voltage V1, V2Vn are respectively equipped with, multi-channel dc power supply is just
Voltage Vb between pole and negative pole, G1, G2Gn are denoted as by R1+, R2+Rn+ inverse, and note R- inverse is
G0。
Optionally, the closing relay RY1, disconnect relay RY2, obtain on multi-channel dc power supply negative pole relative to
Ground voltage value Vg1, formula one is determined according to magnitude of voltage Vg1, including：
Obtained based on Kirchhoff's current law (KCL)：
Optionally, disconnection relay RY1, the closing relay RY2, obtain on multi-channel dc power supply negative pole relative to
Ground voltage value Vg2, formula two is determined according to magnitude of voltage Vg2, including：
Obtained based on Kirchhoff's current law (KCL)：
Optionally, it is described according to formula one and formula two, it is determined that the mathematic(al) representation on ground insulation resistance, according to number
The scope that expression formula determines earth impedance is learned, including：
Formula one is subtracted each other with formula two, and by equation two ends simultaneously divided by Vg2-Vg1, afterwards carry out transposition processing, obtain
To the mathematic(al) representation as shown in formula three
The threshold value of multi-channel dc power supply ground insulation resistance is set, if the inverse less than threshold value on the left of the equal sign of formula four
Value, then show multi-channel dc power supply ground insulation resistance value meet require, it is on the contrary then be unsatisfactory for requirement.
The beneficial effect that the technical scheme that the present invention is provided is brought is：
Before and after relay closure, two different voltages are sampled, to judge whether impedance ground is more than some value
Mode replace accurately calculate each dc source to ground impedance occurrence mode, simplify the detection of ground insulation resistance
Mode, while also having simplified the circuit structure of detection circuit, reduces the cost of inverter and the triviality of detection circuit.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the accompanying drawing used required in being described below to embodiment
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that the flow of the detection method for the multi-channel DC input power both positive and negative polarity ground insulation resistance that the present invention is provided is shown
It is intended to；
Fig. 2 is the electrical block diagram for including multi-channel dc power supply that the present invention is provided.
Embodiment
To make the structure and advantage of the present invention clearer, the structure of the present invention is made further below in conjunction with accompanying drawing
Description.
Embodiment one
The invention provides the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance, for straight to multichannel
Stream power supply earth impedance detected, the detection method, as shown in figure 1, including：
11st, provided with the sampling resistor Ra and relay being sequentially connected in series between the positive pole of multi-channel DC input power and ground
RY1, provided with the sampling resistor Rb and relay RY2 being sequentially connected in series between the negative pole of multi-channel DC input power and ground；
12nd, closing relay RY1, disconnects relay RY2, obtains on multi-channel dc power supply negative pole relative to ground voltage
Value Vg1, formula one is determined according to magnitude of voltage Vg1；
13rd, relay RY1, closing relay RY2 are disconnected, is obtained on multi-channel dc power supply negative pole relative to ground voltage
Value Vg2, formula two is determined according to magnitude of voltage Vg2；
14th, according to formula one and formula two, it is determined that the mathematic(al) representation on ground insulation resistance, according to mathematic(al) representation
Determine the scope of earth impedance.
In force, the detection method is used to detect the ground insulation resistance of multi-channel dc power supply, includes multichannel
The circuit structure diagram of dc source is as shown in Fig. 2 circuit is included provided with n roads PV inputs, pair of the positive and negative terminal of first via PV inputs
Ground insulation impedance is respectively R1+, R1-, and the ground insulation resistance of the positive and negative terminal of the second road PV inputs is respectively R2+, R2-, with this
Analogize, the ground insulation resistance of the positive and negative terminal of the n-th road PV inputs is respectively Rn+, Rn-, because the negative terminal that every road PV is inputted is in parallel
Together, R1-, R2-Rn parallel impedance are denoted as R-；It is electric per input all the way, is respectively equipped with for n roads PV inputs
Press V1, V2Vn, the voltage Vb between the positive pole and negative pole of multi-channel dc power supply, by R1+, R2+Rn+ inverse
G1, G2Gn are denoted as, note R- inverse is G0.
All there is impedance between the positive and negative terminal and the earth of all inputs, simply this impedance is very under normal circumstances
It is big, we will not be caused harm, when abnormal conditions occur, this impedance becomes very small, it is possible to jeopardize life
Property safety is ordered, is then accomplished by detecting this impedance.
Connected in the circuit of multi-channel dc power supply using relay RY1 with sampling resistor Ra and be presently connected to ground from BUS, made
Connected with relay RY2 with sampling resistor Ra and be connected to ground from BUS is negative.The detecting voltage Vi brought by RY1 and RY2 break-make
Change may determine that whether isolated input impedance meets requirement.
Specifically, in step 12, the closing relay RY1 disconnects relay RY2, obtain on multi-channel DC electricity
Source negative pole determines formula one relative to ground voltage value Vg1 according to magnitude of voltage Vg1, including：
Obtained based on Kirchhoff's current law (KCL)：
Specifically, in step 12, disconnection relay RY1, the closing relay RY2 are obtained on multi-channel DC electricity
Source negative pole determines formula two relative to ground voltage value Vg2 according to magnitude of voltage Vg2, including：
Obtained based on Kirchhoff's current law (KCL)：
It is described according to formula one and formula two after execution of step 11-13, in addition it is also necessary to perform step 14, it is determined that on
The mathematic(al) representation of ground insulation resistance, the scope of earth impedance is determined according to mathematic(al) representation, including：
41st, formula one is subtracted each other with formula two, and by equation two ends simultaneously divided by Vg2-Vg1, afterwards carry out transposition processing,
Obtain the mathematic(al) representation as shown in formula three
42nd, the threshold value of multi-channel dc power supply ground insulation resistance is set, if being less than threshold value on the left of the equal sign of formula four
Reciprocal value, then show multi-channel dc power supply ground insulation resistance value meet require, it is on the contrary then be unsatisfactory for requirement.
Known quantity when sampling resistor Ra, Rb are circuit design in formula three, the positive pole of multi-channel dc power supply and negative pole it
Between voltage be Vb, by machine sampling it is known that Vg1, Vg2 can also be learnt by Vi sampling, then pass through the above
We can just calculate G0+G1+G2+ ...+Gn to formula, and the resistances of this four values insulation impedance of interest in detecting
It is reciprocal and.
For example need impedance of the detection less than 50k Ω, then whenWhen, then its
In must there is at least one impedance to be less than 50k Ω's.WhenWhen, then all values must
So all it is greater than 50k Ω's.Thus it is all to be detected that any insulation impedance all the way, which is less than 50k Ω, in simply entering
's.
There is the possibility of flase drop in above-mentioned detection method, but in the absence of the possibility of missing inspection, it is higher to safety requirements at some
Place, can be with convenient use.
The invention provides the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance, it is included in multichannel straight
Flow between the both positive and negative polarity of input power and ground provided with the sampling resistor and relay being sequentially connected in series；Two relays are entered respectively
Row closure, break-make processing, get under different conditions that multi-channel dc power supply negative pole is relative to ground voltage value, it is determined that on right
The mathematic(al) representation of ground insulation impedance, the scope of earth impedance is determined according to mathematic(al) representation.Before and after relay closure, adopt
Sample is replaced in the way of judging whether impedance ground is more than some value to two different voltages and accurately calculates each dc source
To the mode of the occurrence of ground impedance, the detection mode of ground insulation resistance is simplified, while also having simplified the electricity of detection circuit
Line structure, reduces the cost of inverter and the triviality of detection circuit.
Each sequence number in above-described embodiment is for illustration only, and the elder generation during the assembling or use of each part is not represented
Afterwards sequentially.
Embodiments of the invention are the foregoing is only, are not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (5)
1. the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance, for multi-channel dc power supply to ground resistance
It is anti-to be detected, it is characterised in that the detection method, including：
Provided with the sampling resistor Ra and relay RY1 being sequentially connected in series between the positive pole of multi-channel DC input power and ground,
Provided with the sampling resistor Rb and relay RY2 being sequentially connected in series between the negative pole of multi-channel DC input power and ground；
Closing relay RY1, disconnects relay RY2, obtains on multi-channel dc power supply negative pole relative to ground voltage value Vg1,
Formula one is determined according to magnitude of voltage Vg1；
Relay RY1, closing relay RY2 are disconnected, is obtained on multi-channel dc power supply negative pole relative to ground voltage value Vg2,
Formula two is determined according to magnitude of voltage Vg2；
According to formula one and formula two, it is determined that the mathematic(al) representation on ground insulation resistance, according to mathematic(al) representation determination pair
The scope of ground impedance.
2. the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance according to claim 1, its feature
It is, in the multi-channel dc power supply：
Provided with n roads PV inputs, the ground insulation resistance of the positive and negative terminal of first via PV inputs is respectively R1+, R1-, and the second road PV is defeated
The ground insulation resistance of the positive and negative terminal entered is respectively R2+, R2-, by that analogy, the insulation against ground of the positive and negative terminal of the n-th road PV inputs
Impedance is respectively Rn+, Rn-, because every road PV negative terminals inputted are connected in parallel, by R1-, R2-Rn parallel impedance
It is denoted as R-；
For n roads PV input per all the way, be respectively equipped with input voltage V1, V2Vn, the positive pole of multi-channel dc power supply with
Voltage Vb between negative pole, is denoted as G1, G2Gn, note R- inverse is G0 by R1+, R2+Rn+ inverse.
3. the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance according to claim 2, its feature
It is, the closing relay RY1, disconnects relay RY2, obtains on multi-channel dc power supply negative pole relative to ground voltage value
Vg1, formula one is determined according to magnitude of voltage Vg1, including：
Obtained based on Kirchhoff's current law (KCL)：
4. the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance according to claim 3, its feature
It is, disconnection relay RY1, the closing relay RY2, obtains on multi-channel dc power supply negative pole relative to ground voltage value
Vg2, formula two is determined according to magnitude of voltage Vg2, including：
Obtained based on Kirchhoff's current law (KCL)：
5. the detection method of multi-channel DC input power both positive and negative polarity ground insulation resistance according to claim 4, its feature
It is, it is described according to formula one and formula two, it is determined that the mathematic(al) representation on ground insulation resistance, true according to mathematic(al) representation
Determine the scope of earth impedance, including：
Formula one is subtracted each other with formula two, and by equation two ends simultaneously divided by Vg2-Vg1, afterwards carry out transposition processing, obtain as
Mathematic(al) representation shown in formula three
The threshold value of multi-channel dc power supply ground insulation resistance is set, if the reciprocal value less than threshold value on the left of the equal sign of formula four,
Then show multi-channel dc power supply ground insulation resistance value meet require, it is on the contrary then be unsatisfactory for requirement.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111983316A (en) * | 2020-07-29 | 2020-11-24 | 江苏固德威电源科技股份有限公司 | ISO detection method and device |
| CN117647676A (en) * | 2024-01-26 | 2024-03-05 | 永联科技(常熟)有限公司 | Insulation resistance detection circuit and detection method |
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| CN1531202A (en) * | 2002-06-06 | 2004-09-22 | 模拟设备股份有限公司 | Bipolar complementary metal oxide semiconductor latch with NPN control device structure suitable for limiting current of NPN positive feedback device |
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Address after: Tonglu Economic Development Zone, Hangzhou city of Zhejiang Province, Shi Chu Road 311500 No. 288 Applicant after: Zhejiang elong network energy technology Co. Ltd Address before: Tonglu Economic Development Zone, Hangzhou city of Zhejiang Province, Shi Chu Road 311500 No. 288 Applicant before: SOLAX POWER CO., LTD. |
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Application publication date: 20170804 |