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Fluke 1625 Инструкция по эксплуатации онлайн [81/90] 4469
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Stakeless Earth/Ground Resistance Testing
Principle of Operation
73
Display
Significance
Note
ST
V
edw069.eps
Resistance
under test is
above
measuring
range
Legend: W= displayed flashing
Содержание
- Earth ground tester users manual 1
- Fluke corporation p o box 9090 everett wa 98206 9090 u s a 2
- Fluke europe b v p o box 1186 5602 bd eindhoven the netherlands 2
- Limited warranty and limitation of liability 2
- Table of contents 3
- Title page 3
- List of tables 5
- List of figures 7
- Earth ground tester 9
- Introduction 9
- Earth ground tester models and accessories 11
- Models and accessories 11
- Table 1 lists the models and accessories 11
- Safety instructions 12
- W warning 12
- Checking the scope of delivery 13
- Qualified staff 13
- Unpacking 13
- Additional accessories 14
- General 14
- Assembly 15
- Description of functions 15
- Fullwave rectification for dc and ac dc without operational sign ac signal sinus calibrated for r m s values if limit values are exceeded no measurement will be started 16
- Measurement of interference frequency 16
- Measurement of interference frequency fst 16
- Measurement of interference voltage 16
- Measurement of interference voltage ust 16
- V its frequency is derived from the period time 16
- Beeper 17
- Checking for correct measuring connection 17
- Low resistance measurement 17
- Low resistance measurement r 17
- Measurement of earthing resistance 17
- Measurement of earthing resistance re 17
- Resistance measurement r 17
- Selective measurement of earthing resistance 17
- Selective measurement of earthing resistance re 17
- Lo bat 18
- Specifications 18
- Earthing resistance 21
- Earthing resistance re 21
- Measurement of interference frequency 21
- Measurement of interference frequency fst 21
- Measurement of interference voltage dc ac 21
- Measurement of interference voltage dc ac ust 21
- 10 25 2000 23
- Digits r r r 23
- X value fiducial b b 23
- 300 ω 250 ω 1 m ω 24
- 6 k ω 2 5 k ω 10 m ω 24
- 60 k ω 25 k ω 100 m ω 24
- 600 k ω 250 k ω 1 ω 24
- Automatic switchover of measuring resolution in dependence to auxiliary earth electrode resistance 24
- Fluencing conditions see diagramm the display shows a warning symbol w and a notice that rs or rh are too high 24
- Rh with umeas 48 v rh with umeas 20 v resolution 24
- Users manual 24
- 10 25 2000 25
- Additonal error because of probe and auxiliary earth typ electrode resis tance 25
- Digits r r r 25
- Earth ground tester specifications 25
- Max overload max urms 250 v measurement will not be started 25
- Measuring error of rh and rs typ of 10 of 25
- Measuring fre quency 94 105 111 128 hz selected manually or automati cally afc 55 hz 25
- Measuring method current and voltage measurement with probe as per en61557 5 and current measurement in the individual branch with additional current transformer patent ap plied for 25
- Measuring time typ 8 sec with a fixed frequency 30 sec max with afc and complete cycle of all measuring frequencies 25
- Noise rejection 120 db 16 2 3 50 60 400 hz 25
- Open circuit volt age 20 48 v ac 25
- Selective measurement of the earthing resistance 25
- Selective measurement of the earthing resistance re 25
- Short circuit current 250 ma ac 25
- With recommended current clamps transformers 25
- Ma 0 ma with transformer 200 1 26
- Max interference voltage 24 v with higher voltages measurement will not be started 26
- Max overload urms max 250 v 26
- Measuring frequency 94 105 111 128 hz selected manually or auto matically afc 26
- Measuring method current and voltage measurement 26
- Measuring time typ 6 sec 26
- Measuring voltage 20 v ac square pulse 26
- Minimal current in single branch to be measured 0 ma with transformer 1000 1 26
- Resistance measurement r 26
- Earth ground tester specifications 27
- Formation of measured value with 4 pole measurement wires on h s es can be extended without additional error 27
- Max inductivity 2 henry 27
- Max interference voltage 3 v ac or dc with higher voltages measure ment will not be started 27
- Max overload urms 250 v 27
- Measuring method current voltage measurement as per iec61557 4 possible 27
- Measuring sequence approx 2 measurements s 27
- Measuring time typ 4 sec incl reversal of polarity 2 pole or 4 pole 27
- Open circuit voltage 20 v dc 27
- Resistance measurement 27
- Resistance measurement r 27
- Short circuit current 200 ma dc 27
- Ω in wire e can cause additional error of 5m ω ω 27
- Compensation of lead resistance 28
- Compensation of lead resistance rk 28
- A central rotary switch to select measuring function or switch on off 29
- B start test button to start the set measuring function 29
- C display menu button to call corresponding supplementary values 29
- Description of the operating elements 29
- Earth ground tester 29
- Earth ground tester description of the operating elements 29
- Edw006 eps 29
- Figure 4 illustrates the operating elements described below 29
- Figure 4 operating elements 29
- R ra r 29
- W attention 30
- W warning 30
- Description of display elements 31
- Procedure of measurements 32
- W warning 32
- Power on functions 33
- Operation 34
- Control loop measuring loop 35
- Earth ground tester procedure of measurements 35
- Figure 6 operational modes 35
- After parmeter setting has been finished the next display can be called with display menu or the measurement can be started with start test 36
- After turning the function rotary switch the voltage display mode is reached pushing display menu now calls up the control loop according to the selected measuring function different setting values can be displayed and changed in the control loop the display menu button switches between the different set values inside a contiuous loop the select button selects the decimal point to be changed pushing the change item button the instrument either switches between certain set values or increases the decimal point selected with select by 1 36
- Control loop 36
- Depending on the selected function the following parameters can be displayed or changed 36
- Earth ground tester procedure of measurements 37
- See compensation of earth electrode connecting lead 37
- Checking of correct measuring connection socket alloca tion 38
- Measuring loop 38
- Measurement of interference voltages and frequen cies 39
- Safety control measurements 39
- Measurement of earthing resistances 40
- Pole 4 pole measurement of earthing resistance 41
- Measurement of single earth electrode resistances in mesh operated earthing systems using selective clamp method 44
- Pole 4 pole measurement of single earth electrode re sistances 45
- Pole measurement with longer earth electrode connect ing leads 46
- Remarks for the setting of earth spikes 46
- Time average measurement 46
- Measurements on high voltage pylons 47
- Measuring the earthing resistance without disengaging the overhead earth wire using the selective clamp method 47
- 1 1 1 1 48
- Li u r 48
- R r r r 48
- 1 1 1 1 49
- R r r r 49
- Correcting clip on transformer errors 50
- Measuring earthing impedance with 55 hz r 50
- Mer ontransfpr p withoutcli r mer ontransfor withclip r trold trnew 51
- 5 19 983 192 100 52
- 983 175 1000 52
- Compensation of earth electrode connecting lead 52
- Measurement of soil resistivity 53
- R a 2 π ρ 54
- Earth ground tester procedure of measurements 55
- Earth ground tester 56
- Measurement of resistances 56
- R ra r 56
- Resistance measurement r 56
- This measuring function determines the ohmic resistance between 0 01 ω and 300 k ω the measurement is done with ac voltage for measurements of very low resistances a compensation of the connecting leads is suggested see compensation of measuring lead resistance 56
- Turn central rotary switch to position r 56
- Resistance measurement r f 57
- W warning 57
- Compensation of measuring lead resistance 58
- W warning 58
- Changing of all data settings with personalized code 59
- Earth ground tester procedure of measurements 59
- Edw026 eps 59
- Figure 20 compensation of measuring lead resistance 59
- Settings can only be made in the respective functions 59
- Turning the central rotary switch for a short moment deletes the line compensation again 59
- With this function fm um limit limit beeper ratio r f limit and set values can be programmed which keeps them memorized even if the instru ment is switched on off this feature enables the operator to create an in strument set up with customer defined settings according to the specific need 59
- Storing a code 61
- Deleting a code 62
- Description of displays 63
- Legend w displayed flashing 63
- Lo bat 63
- Legend w displayed flashing 64
- Earth ground tester description of displays 65
- Legend w displayed flashing 65
- Legend w displayed flashing 66
- After start 67
- Check bat teries switch on off if still faulty contact service 67
- Earth ground tester description of displays 67
- Function displays condition note 67
- Legend w displayed flashing 67
- No reactions to button control etc 67
- Operation under faulty con ditions 67
- Care and maintenance 68
- If used and treated properly the instrument needs no maintenance to clean the instrument use only a moist cloth with some soap water or soft household 68
- Legend w displayed flashing 68
- Replacing batteries 69
- Recalibration 70
- Service 70
- Storage 70
- Appendix a 71
- Introduction 71
- Stakeless earth ground resistance testing 71
- Specifications 72
- Principle of operation 73
- Purpose 73
- R r r r 74
- 1 1 1 1 75
- R r r r 75
- Clamp both transformers around the ground conductor to be tested 76
- Cm between the clamps for optimal re sults 76
- Connect the adapter according to the diagram and the designations e s and h c1 p1 and p2 for us version to the tester and to a current clamp 76
- D 3 pole 76
- Earth ground tester 76
- Operation 76
- R ra r 76
- Use only current transformers referred to in this manual 76
- Use the test cable contained in the set to connect the second current clamp to the socket ensure that connections are in the correct polarity turn the rotary switch of the tester to position 76
- Users manual 76
- Settings on the tester 77
- Applications 78
- Example1 ground rod on power poles 78
- Description of displays 80
- Legend w displayed flashing 80
- With stakeless ground testing some display combinations have certain signifi cance 80
- Appendix b 82
- Earthing resistance 82
- Introduction 82
- Earthing resistance principle of operation 83
- For concrete mixtures 1 7 the values have to be increased by 24 83
- Soil resistivity 84
- Earthing resistance principle of operation 85
- Temporal change of the earthing resistance of a buried earth electrode earth pipe earth plate 85
- Temporal change of the earthing resistance of a conductor earth electrode earth strip earth cable 85
- Measuring method 86
- Around every earth electrode a so called potential gradient area develops dur ing the flow of an electric current see picture below 87
- Earthing resistance principle of operation 87
- The potential gradient area 87
- The influence of potential gradient areas on earth resis tance measurement 88
- Earth impedance r on high voltage transmission lines 89
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