CN107907745A - A kind of earth resistance tester and its grounding monitor method - Google Patents
A kind of earth resistance tester and its grounding monitor method Download PDFInfo
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- CN107907745A CN107907745A CN201711494321.1A CN201711494321A CN107907745A CN 107907745 A CN107907745 A CN 107907745A CN 201711494321 A CN201711494321 A CN 201711494321A CN 107907745 A CN107907745 A CN 107907745A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 96
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
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- 230000005283 ground state Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 210000001367 artery Anatomy 0.000 claims description 3
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- 238000005070 sampling Methods 0.000 claims description 3
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- 210000003462 vein Anatomy 0.000 claims description 3
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Classifications
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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
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
-
- 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
The present invention discloses a kind of earth resistance tester and its grounding monitor method.Earth resistance tester is using the L phase lines of the electric power system at ground connection to be measured, N zero curves, PE ground wires, the monitoring measurement ground connection dotted state to be measured under conditions of auxiliary line is not used.Earth resistance tester includes：Test circuit；Positive input terminal connects L phase lines, and negative input end connects the test power supply of N zero curves；Positive input terminal connects L phase lines, and negative input end connects the test regulated power supply of PE ground wires.Test circuit includes：Control circuit；Under the Pulse Width Control of pulse output end, there is provided the reference pulse of constant current output provides circuit；Constant current output circuit is exchanged, the output for the positive output end for testing power supply is converted to the exchange constant current output for injecting earth point to be measured by it under the control of reference pulse；Two sample circuits, it samples N zero curves respectively and PE ground wires obtain sampled voltage, and is sent into a pair of of differential input end, control circuit is thus obtained the potential difference between N zero curves and PE ground wires.
Description
Technical field
The present invention relates to a kind of grounding monitor apparatus field, more particularly to a kind of earth resistance tester and its grounding monitor
Method.
Background technology
In distribution system, system earth is the most key safety measure.At present using the side of cycle Site Detection
Method is safeguarded, is passed through the connection state laid interim auxiliary earth polar measurement of Grounding Resistance value and estimate ground path during detection, is judged
Whether earthed system closes rule.Two line measurements as shown in Figure 1, tester form survey by testing connecting line, earthing pole, the earth
Circuit is measured, measures the ground resistance of earth point to be measured.
The content of the invention
It is auxiliary not using it is an object of the invention to provide a kind of L phase lines that can utilize Devices to test, N zero curves, PE ground wires
Monitoring measures the ground state of earth point to be measured and earth resistance tester and its ground connection of grounding resistance under conditions of index contour
Monitoring method.
The present invention is realized using following technical scheme：A kind of earth resistance tester, it includes：
Test circuit, it is used to test the potential difference between the N zero curves of Devices to test and PE ground wires；
Power supply circuit is tested, its positive input terminal connects the L phase lines of Devices to test, its negative input end connection N zero curves；And
Test regulated power supply, its positive input terminal connection L phase lines, its negative input end connection PE ground wires；
Wherein, the test circuit includes：
Control circuit, it is with pulse output end, a pair of of differential input end；
Reference pulse provides circuit, two input terminal connects the test positive output end of power supply circuit and described respectively
Test the positive output end of regulated power supply；The reference pulse provides circuit under the Pulse Width Control of pulse output end, there is provided constant current
The reference pulse of output；
Exchange constant current output circuit, the positive output end of its input terminal connection test power supply circuit, the exchange constant current
Output circuit is converted to injection under the control of the reference pulse, by the output of the positive output end of the test power supply circuit and treats
Survey the exchange constant current input of ground terminal；And
Two sample circuits, it samples N zero curves respectively and PE ground wires obtain corresponding sampled voltage, and it is right to be respectively fed to this
Differential input end, makes the control circuit thus obtain the potential difference between N zero curves and PE ground wires.
Further as such scheme is improved, and the test circuit further includes two filter circuits, two sampled voltages
Respectively by being re-fed into this to differential input end after the filtering of described two filter circuits.
Further as such scheme is improved, and the test power supply circuit includes：
Resistance R1, its one end connection L phase lines；
Diode D1, the other end of its anode connection resistance R1, its cathode connect the reference pulse and provide circuit at the same time
Constant current output circuit is exchanged with described；
Capacitance C1, the cathode of its one end connection diode D1, its other end connection N zero curves；And
Resistance R3, it is connected in parallel on capacitance C1.
Further as such scheme is improved, and the test regulated power supply includes：
Resistance R2, its one end connection L phase lines；
Diode D2, the other end of its anode connection resistance R2, its cathode connect the reference pulse and provide circuit；
Capacitance C2, the cathode of its one end connection diode D2, its other end connection PE ground wires；And
Zener diode Dz1, the cathode of its cathode connection diode D2, its anode connection PE ground wires.
Further as such scheme is improved, and the reference pulse, which provides circuit, to be included：
Resistance R4, its one end connect the test power supply circuit；
Photodiode OP1, the other end of its anode connection resistance R4, its cathode connection pulse output end, its collector
The test regulated power supply is connected, its emitter connects the exchange constant current output circuit.
Further as such scheme is improved, and the exchange constant current output circuit includes：
Resistance R8, its one end connect the test power supply circuit；
Junction field effect transistor J1, the other end of its collector connection resistance R8, its base stage connect the reference pulse
Circuit is provided；And
Resistance R5, its one end connect the reference pulse and provide circuit, its other end connection junction field effect transistor J1
Emitter and form exchange constant current output end OUT, the exchange constant current output end OUT connection PE ground wires simultaneously access described to be measured
Earth point.
Further as such scheme is improved, and the earth resistance tester further includes the display of connection control circuit
Device.
Further as such scheme is improved, the earth resistance tester further include the operation of connection control circuit by
Button, assigning instruction to the control circuit by the operation button makes pulse output end export pulse；And/or the ground connection
Resistance monitor further includes the telecommunication circuit of connection control circuit, and instruction is assigned to the control circuit by the telecommunication circuit
Pulse output end is set to export pulse.
The present invention also provides a kind of grounding monitor method, it is applied to above-mentioned earth resistance tester described in any one
In, it comprises the following steps：
The level that the reference pulse offer is electrically connected on the positive output end of the test regulated power supply passes through described
Regulated power supply stabilization is tested in a steady state value；
The reference pulse provides circuit under the Pulse Width Control of pulse output end, there is provided the reference pulse of constant current output；
Under the control of the reference pulse, form exchange constant current output injection the earth is the exchange constant current output circuit
The earth point to be measured of Devices to test；
The electric current of the fixed frequency and size of injecting the earth flows back through PE ground wire-N zero curves all the way, to be measured is connect through described all the way
The ground terminal of distribution end described in line resistance Rg- between the ground terminal of place-earth point to be measured to the distribution end of Devices to test-
N zero curves flow back；
Through two sampling circuit samples, this of input control circuit draws N zero curves to differential input end by Differential Input
Potential difference between PE ground wires, so as to calculate " PE ground wire-N zero curves " and " earth point to be measured-earth point to be measured
To between the ground terminal of the distribution end of Devices to test line resistance Rg- described in distribution end ground terminal-N zero curves " resistance value.
Further as such scheme is improved, when PE ground wires disconnect, the grounding monitor method be changed into L phase lines with
Two collimation methods of N zero curves go to measure the ground resistance of the Devices to test, read grounding resistance in real time.
The present invention can be monitored and surveyed using the L phase lines of Devices to test, N zero curves, PE ground wires under conditions of auxiliary line is not used
The ground state of Devices to test is measured, and when PE ground wires break, grounding monitor can be changed into two line measurement ground resistances, it is real
When read grounding resistance.
Brief description of the drawings
Fig. 1 is system earth Site Detection method schematic diagram in current distribution system.
Fig. 2 is the structure diagram of earth resistance tester provided in an embodiment of the present invention.
Fig. 3 is the circuit diagram of earth resistance tester in Fig. 2.
Fig. 4 is the grounding monitor method schematic diagram of earth resistance tester in Fig. 2.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
The earth resistance tester of the present invention is not using auxiliary line using the L phase lines of Devices to test, N zero curves, PE ground wires
Under conditions of monitoring measurement Devices to test ground state, as shown in Fig. 2, earth resistance tester include test circuit 1, test
Power supply circuit 2, test regulated power supply 3.
Test circuit 1 is used to test the potential difference between the N zero curves of Devices to test and PE ground wires.Test power supply circuit 2
Positive input terminal connects the L phase lines of Devices to test, its negative input end connection N zero curves.Test the positive input terminal connection L of regulated power supply 3
Phase line, its negative input end connection PE ground wires.
Test circuit 1 includes control circuit 4, reference pulse provides circuit 5,6, two sampling electricity of exchange constant current output circuit
7, two, road filter circuit 8, display 9, operation button 10, telecommunication circuit 11.
Control circuit 4, which uses, has pulse output end P, the MCU of a pair of of differential input end ADC1, ADC2.
Reference pulse provides the positive output end of two input terminals difference connecting test power supply circuit 2 of circuit 5 and tests steady
The positive output end of voltage source 3.Reference pulse provides circuit 5 under the Pulse Width Control of pulse output end P, there is provided the base of constant current output
Quasi- pulse.
The positive output end of the input terminal connecting test power supply circuit 2 of constant current output circuit 6 is exchanged, exchanges constant current output circuit
6 under the control of the reference pulse, and the output for the positive output end for testing power supply circuit 2 is converted to setting for injection Devices to test
The exchange constant current output of the ground terminal at standby end 12.
Two sample circuits 7 sample N zero curves respectively and PE ground wires obtain corresponding sampled voltage, and are respectively fed to this to difference
Divide input terminal ADC1, ADC2, control circuit 4 is thus obtained the potential difference between N zero curves and PE ground wires.In order to improve potential difference
Exact value, two sampled voltages respectively by be re-fed into after the filtering of two filter circuits 8 this to differential input end ADC1,
ADC2。
Display 9 connects control circuit 4, thinks data message to be shown for display control circuit 4.
Operation button 10 connects control circuit 4, and assigning instruction to control circuit 4 by operation button 10 makes pulse output end
Export pulse.
Telecommunication circuit 11 connects control circuit 4, and assigning instruction to control circuit 4 by telecommunication circuit 11 makes pulse output end
P exports pulse.Telecommunication circuit 11 can be that RS232 telecommunication circuits can also be RS485 telecommunication circuits etc..
The earth resistance tester of the present invention, its corresponding grounding monitor method comprise the following steps：
It is electric by testing voltage stabilizing that reference pulse provides the level that circuit 5 is connected on the positive output end of test regulated power supply 3
Stablize in a steady state value in source 3；
Reference pulse provides circuit 5 under the Pulse Width Control of pulse output end P, there is provided the reference pulse of constant current output；
Constant current output circuit 6 is exchanged under the control of the reference pulse, exchange constant current output injection the earth is formed and treats
The ground terminal of the equipment end 12 of measurement equipment；
The electric current of the fixed frequency and size of injecting the earth flows back through PE ground wire-N zero curves all the way, all the way through the equipment end
Described in the ground terminal of 12 ground terminal-equipment end 12 to the line resistance Rg- between the ground terminal of the distribution end 13 of Devices to test
Ground terminal-N zero curves the reflux of distribution end 13；
Sampled through two sample circuits 7, differential input end ADC1, ADC2 of input control circuit 4, are obtained by Differential Input
Go out the potential difference between N zero curves and PE ground wires, thus calculate " PE ground wire-N zero curves " with " ground terminal of the equipment end 12-
Distribution end 13 connects described in the ground terminal of the equipment end 12 to the line resistance Rg- between the ground terminal of the distribution end 13 of Devices to test
The resistance value of ground terminal-N zero curves ".
When PE ground wires disconnect, the grounding monitor method is changed into L phase lines and two collimation methods of N zero curves go to treat described in measurement
The ground resistance of measurement equipment, reads grounding resistance in real time.For the implementation for the present invention that preferably illustrates, electricity of the invention
Realize as shown in subsequent embodiment 1 on road.
Embodiment 1
Referring to Fig. 3, the earth resistance tester of the present invention is using the L phase lines of Devices to test, N zero curves, PE ground wires, not
Using the ground state of monitoring measurement Devices to test under conditions of auxiliary line.The earth resistance tester include test circuit,
Test power supply circuit to test circuit power supply, the test regulated power supply to test circuit offer voltage stabilizing electricity.
In the present embodiment, resistance R1, diode are included using following test power supply circuit, the test power supply circuit
D1, capacitance C1, resistance R3.One end connection L phase lines of resistance R1, the anode of the other end connection diode D1 of resistance R1, two poles
Pipe D1 cathode connecting test circuit (following article introduction, the cathode of diode D1 at the same time the resistance R4 of connecting test circuit and
Resistance R8).The cathode of one end connection diode D1 of capacitance C1, the other end connection N zero curves of capacitance C1.Resistance R3 is connected in parallel on electricity
Hold on C1.
In the present embodiment, resistance R2, diode are included using following test regulated power supply, the test regulated power supply
D2, capacitance C2, zener diode Dz1.One end connection L phase lines of resistance R2, the sun of the other end connection diode D2 of resistance R2
Pole, diode D2 cathode connecting test circuit (following article introduction, the photoelectricity two of the cathode connecting test circuit of diode D2
The collector of pole pipe OP1).The cathode of one end connection diode D2 of capacitance C2, its other end connection PE ground wires.Zener diode
The cathode of the cathode connection diode D2 of Dz1, the anode connection PE ground wires of zener diode Dz1.Capacitance C1 and capacitance C2 may be used
With using electrolytic capacitor, as shown in Figure 3.
The test circuit includes control circuit MCU, capacitance-resistance RC1, resistance R6, capacitance-resistance RC2, resistance R7, resistance R4, photoelectricity
Diode OP1, resistance R8, junction field effect transistor J1, resistance R5.Wherein, the English full name of junction field effect transistor is
Junction Field-Effect Transistor, referred to as JFET.
Control circuit MCU has a pair of of differential input end ADC1, ADC2, and pulse output end P, such as uses chip MDS
8HC908, just there is a pair of of differential input end ADC1, ADC2, pulse output end P.
One end of the other end connection resistance R6 of one end connection the differential input end ADC1, capacitance-resistance RC1 of capacitance-resistance RC1, resistance
The other end connection N zero curves of R6.The other end connection resistance R7 of one end connection the differential input end ADC2, resistance RC2 of capacitance-resistance RC2
One end, resistance R7 the other end connection PE ground wires.
The cathode of the diode D1 of one end connection test power supply circuit of resistance R4, the other end connection light of resistance R4
The anode of electric diode OP1.The collector of cathode connection the pulse output end P, photodiode OP1 of photodiode OP1 connect
Connect the cathode of the diode D2 of the test regulated power supply, one end of the emitter connection resistance R5 of photodiode OP1.Resistance
The emitter of the other end connection junction field effect transistor J1 of R5 simultaneously forms exchange constant current output end OUT, and junction field is brilliant
The emitter of the base stage connection photodiode OP1 of body pipe J1, the collector connection resistance R8's of junction field effect transistor J1
One end, the cathode of the diode D1 of the other end connection test power supply circuit of resistance R8.The exchange constant current output end OUT
Connection PE ground wires simultaneously access the earth point to be measured of Devices to test.
The test circuit may also include the accessory circuit such as display, operation button, telecommunication circuit.As display can be adopted
With LCD display, display connection control circuit MCU, can be used for real-time display control circuit MCU needs every letter to be shown
Breath.For another example operation button, operation button connection control circuit MCU, assigning instruction to control circuit MCU by operation button makes arteries and veins
Rush output terminal P output pulses.For another example telecommunication circuit, telecommunication circuit connection control circuit MCU, by telecommunication circuit to control circuit
MCU, which assigns instruction, makes pulse output end P export pulse, and telecommunication circuit can use RS232 communications RS485 can also be used to communicate
Or other communication modes.
In monitoring, its grounding monitor method comprises the following steps the earth resistance tester：
At the collector of photodiode OP1 the level of Vb by the test regulated power supply stabilization in a steady state value,
Junction field effect transistor J1 control pole constant voltages are given after photodiode OP1 conductings, junction field effect transistor J1 is collecting
Constant current is exported at electrode during the level constant of Vb, the constant current is in exchange constant current output end OUT injection the earth；
The electric current of the fixed frequency and size of injecting the earth flows back through PE ground wire-N zero curves all the way, to be measured is connect through described all the way
The ground terminal of distribution end described in line resistance Rg- between the ground terminal of place-earth point to be measured to the distribution end of Devices to test-
N zero curves flow back；
Sampled through resistance R6, resistance R7, after capacitance-resistance RC1, capacitance-resistance RC2 second order capacitance-resistance filters, the difference of input control circuit MCU
Point input terminal ADC1, ADC2, circuit potential difference is drawn by Differential Input, thus calculate " PE ground wire-N zero curves " with it is " described
Distribution end described in line resistance Rg- between the ground terminal of earth point to be measured-earth point to be measured to the distribution end of Devices to test
The resistance value of ground terminal-N zero curves ".
When PE ground wires disconnect, the earth resistance tester is changed into two collimation methods of L phase lines and N zero curves from grounding monitor
Remove to measure the ground resistance of the Devices to test, read grounding resistance in real time.
The civilian electricity consumption ground impedance relay in China uses TNC-S, in electrical transformer room to each electricity consumption building three-phase five-wire mode, N
Zero curve is electrical equipment current loop, and PE is grounded for Electrical Safety.As shown in figure 4, earth resistance tester utilizes feeder ear
Neutral earthing is measurement auxiliary earth, measures line as auxiliary earth using N zero curves, power-supply system ground wire is treated for monitoring
Survey ground connection.Injection Current is grounded to electricity consumption end system when earth resistance tester measures, when the three-phase five-wire mode of system is complete
When；By the reflux of PE, N, another part is flowed back by the earth flow direction to power supply ground terminal an Injection Current part through N zero curves,
Measure parallel value of the resistance value for two circuits；When PE is lacked, due under normal circumstances, the PEN of feeder ear it is minimum, survey
Measure the power frequency electric resistance value that result is electricity consumption end.
Embodiment 2
In order to be better understood from the content of embodiment 1, in example 2 using more specifical implementation.
The selected value of primary circuit elements：R1=100 Ω, R2=470 Ω, R3=1M Ω, R4=470K Ω, R5=10K
Ω, R6=R7=100K Ω, R8=500 Ω, P1=MC3020, D1=D2=LM513, DZ1=36V voltage stabilizing, J1=P output arteries and veins
Rush frequency f=800hz.R1, D1, C1, R3 form the primary circuit elements of test power supply circuit；R2, D2, C2, DZ1 form test
The primary circuit elements of regulated power supply, maintain constant level in Vb points, the reference pulse of constant current output, OP1 and J1 are provided for J1
Under the Pulse Width Control of MCU outputs, the exchange constant current output of OUT points is formed.
Testing procedure is as follows.
1. under operation button or RS232 instruction controls, P output 800HZ pulses (through level conversion) the control OP1 of MCU
Break-make.
2. the level of Vb points gives J1 control pole constant voltages since the effect of Dz1 is constant after 36V, OP1 conductings, J1 is in Vb
Permanent timing output constant current, constant current inject the earth in OUT points.
3. inject the earth fixed frequency and size electric current all the way through PE ground wires-N flow back, all the way through GND (equipment end)-
Rg-GND (distribution end)-N zero curves flow back.
4. being sampled through R6, R7, after RC1, RC2 second order capacitance-resistance filter, ADC1, ADC2 Differential Input of MCU is inputted, is drawn back
Road potential difference.So as to calculate the resistance of (PE ground wire-N zero curves) and (GND (equipment end)-Rg-GND (distribution end)-N zero curves)
Value.
5. when PE ground wires disconnect, measured value is the power frequency grounding resistance value of two step method measurement.
In conclusion there are following technical essential for the earth resistance tester of the present invention：
1) using L N PE ground wires connection, under conditions of other auxiliary lines are not used, monitoring grounding state；
2) when PE ground wires break, grounding monitor is changed into two line measurement ground resistances, reads grounding resistance in real time.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of earth resistance tester, with the L phase lines of Devices to test, N zero curves, PE ground wires, is not using the condition of auxiliary line
Lower monitoring measures the ground state of earth point to be measured and the earth resistance tester of grounding resistance.
It is characterized in that, it includes：
Test circuit, it is used to test the potential difference between the N zero curves of Devices to test and PE ground wires；
Power supply is tested, its positive input terminal connects the L phase lines of Devices to test, its negative input end connection N zero curves；Test voltage stabilizing electricity
Source, its positive input terminal connection L phase lines, its negative input end connection PE ground wires；
Wherein, the test circuit includes：
Control circuit, it is with pulse output end, a pair of of differential input end；
Reference pulse provides circuit, two input terminal connects the positive output end and control circuit of the test regulated power supply respectively
Pulse output end；The reference pulse provides circuit under the Pulse Width Control of the pulse output end of control circuit, there is provided constant current
Reference pulse needed for output；
Exchange constant current output circuit, the positive output end of its input terminal connection test power supply, the exchange constant current output
The output of the positive output end of the test power supply is converted under the control of the reference pulse and injects to be measured connect by circuit
The exchange constant current output of the ground terminal in place；
Two sample circuits, it samples N zero curves respectively and PE ground wires obtain corresponding sampled voltage, and is respectively fed to controller
A pair of of differential input end, makes the control circuit thus obtain the potential difference between N zero curves and PE ground wires.
2. earth resistance tester as claimed in claim 1, it is characterised in that：The test circuit further includes two filtered electricals
Road, two sampled voltages after the filtering of described two filter circuits respectively by being re-fed into a pair of of differential input end.
3. earth resistance tester as claimed in claim 1, it is characterised in that：The test power supply circuit includes：
Resistance R1, its one end connection L phase lines；
Diode D1, the other end of its anode connection resistance R1, its cathode connect the reference pulse and provide circuit and institute at the same time
State exchange constant current output circuit；
Capacitance C1, the cathode of its one end connection diode D1, its other end connection N zero curves；And
Resistance R3, it is connected in parallel on capacitance C1.
4. earth resistance tester as claimed in claim 1, it is characterised in that：The test regulated power supply includes：
Resistance R2, its one end connection L phase lines；
Diode D2, the other end of its anode connection resistance R2, its cathode connect the reference pulse and provide circuit；
Capacitance C2, the cathode of its one end connection diode D2, its other end connection PE ground wires；And
Zener diode Dz1, the cathode of its cathode connection diode D2, its anode connection PE ground wires.
5. earth resistance tester as claimed in claim 1, it is characterised in that：The reference pulse, which provides circuit, to be included：
Resistance R4, its one end connect the test power supply circuit；
Photodiode OP1, the other end of its anode connection resistance R4, its cathode connection pulse output end, the connection of its collector
The test regulated power supply, its emitter connect the exchange constant current output circuit.
6. earth resistance tester as claimed in claim 1, it is characterised in that：The exchange constant current output circuit includes：
Resistance R8, its one end connect the test power supply circuit；
Junction field effect transistor J1, the other end of its collector connection resistance R8, its base stage connect the reference pulse and provide
Circuit；And
Resistance R5, its one end connect the reference pulse and provide circuit, the hair of its other end connection junction field effect transistor J1
Emitter-base bandgap grading simultaneously forms exchange constant current output end OUT, and the exchange constant current output end OUT connection PE ground wires simultaneously access the ground connection to be measured
Point.
7. earth resistance tester as claimed in claim 1, it is characterised in that：The earth resistance tester further includes connection
The display of control circuit.
8. earth resistance tester as claimed in claim 1, it is characterised in that：The earth resistance tester further includes connection
The operation button of control circuit, assigning instruction to the control circuit by the operation button makes pulse output end export arteries and veins
Punching；And/or the earth resistance tester further includes the telecommunication circuit of connection control circuit, by the telecommunication circuit to institute
State control circuit assign instruction make pulse output end export pulse.
9. a kind of grounding monitor method, it is applied to earth resistance tester as claimed in any of claims 1 to 8 in one of claims
In, it is characterised in that it comprises the following steps：
The reference pulse provides the level being electrically connected on the positive output end of the test regulated power supply and passes through the test
Regulated power supply stabilization is in a steady state value；
The reference pulse provides circuit under the Pulse Width Control of pulse output end, there is provided the reference pulse of constant current output；
It is i.e. to be measured to form exchange constant current output injection the earth under the control of the reference pulse for the exchange constant current output circuit
The earth point to be measured of equipment；
The electric current of the fixed frequency and size of injecting the earth flows back through PE ground wire-N zero curves all the way, all the way through the ground connection to be measured
Ground terminal-the N of distribution end described in line resistance Rg- between the ground terminal of point-earth point to be measured to the distribution end of Devices to test
Zero curve flows back；
Through two sampling circuit samples, a pair of of differential input end of input control circuit, N zero curves and PE are drawn by Differential Input
Potential difference between ground wire, so as to calculate " PE ground wire-N zero curves " and " earth point to be measured-earth point to be measured is to treating
The resistance value of the ground terminal-N zero curves of distribution end described in line resistance Rg- between the ground terminal of the distribution end of measurement equipment ".
10. grounding monitor method as claimed in claim 9, it is characterised in that：When PE ground wires disconnect, the grounding monitor side
Method is changed into L phase lines and two collimation methods of N zero curves go to measure the ground resistance of the Devices to test, reads grounding resistance in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711494321.1A CN107907745A (en) | 2017-12-31 | 2017-12-31 | A kind of earth resistance tester and its grounding monitor method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711494321.1A CN107907745A (en) | 2017-12-31 | 2017-12-31 | A kind of earth resistance tester and its grounding monitor method |
Publications (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109799393A (en) * | 2018-12-29 | 2019-05-24 | 王翰凌 | Earth resistance tester for home circuit |
| WO2021237977A1 (en) * | 2020-05-26 | 2021-12-02 | 捍防（苏州）实业有限公司 | Apparatus and method for monitoring resistance between null line and ground line |
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| WO2021237977A1 (en) * | 2020-05-26 | 2021-12-02 | 捍防（苏州）实业有限公司 | Apparatus and method for monitoring resistance between null line and ground line |
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