ground tester manual
Contents
1. 1 Multi Point Grounding System sess sss 2 Limited Point Grounding System s sass es 3 Single Point Grounding System sass ss X Bill Of EOoadiNnG aaa aaa aa X Bill of Loading Pincer Grounding Tester 1 piece Test Ring 1 piece 5 Dry Battery 4 pieces User s Manual 1 pieces Qualified Certificate 1 piece 20 In the above three steps the reading measured in each step is the value of the two series grounding resistance In this way we can easily calculate the value of each grounding resistance From R Ri Rs Rg Rc R Rc Ra We get Ry Ry x R2 This is the grounding resistance value of the grounding body Ra To facilitate the memory of the above formula these three grounding bodies scan be viewed as a triangle then the measured resistance is equivalent to the value of the resistance values of the adjacent edges plus or minus resistance value of the opposite sides and divided by 2 As the reference points the grounding resistance values of the other two grounding bodies are Rg R Rg Rc R3 Ra A I Attention A Thank you for purchasing this pincer ground tester of the company In order to make better use of the product please be certain To read this user manual carefully To comply with the operating cautions presented in this manual Under any circumstances pay special attention to safety in the use of the Meter2. it will be followed by showing CAL6 CAL5 CAL4 CALO OL 2 see Figure 2 When OL 2 appears auto inspection is completed and then automatically enter the resistance measurement model see figure 3 It shows OL indicating that the measured resistance value exceeded the upper limit of Meter see Figure 3 It shows 0 01 indicating that the measured resistance value exceeded the lower limit of Meter see Figure 5 IQ Figure 5 4 Data Lock Release In the process of resistance measurement press HOLD key to lock the current show value displaying HOLD symbol Then press VIII Measurement Principle The basic principle of DY1100 DY1000 in the measurement of resistance is to measure the loop resistance as shown in the figure below The jaw part of the Meter is comprised of voltage coil and current coil The voltage coil provides excitation signal and will induce a potential E on the measured loop Under the effects of the potential E the current can generate an the measured loop The Meter wil measure E amp and the measured resistance R can be obtained by 12 2 Shutdown After the Meter is switched on press POWER key to shut it down In five minutes after the Meter started up the LCD screen entered flashing state and would automatically shut down after the flashing state is sustained for 30 seconds to reduce battery consumption Press POWER key
3. Pay attention to the measurement range of the Meter and the using environment provided Pay attention to the text labeled on the panel and back plane of the Meter Before booting up the trigger should be pressed for a couple of times to ensure the jaws are well closed In the process of auto inspection in booting up DO NOT press the trigger nor clamp any wire The process of auto inspection would display CAL6 CAL5 CAL4 CALO OL 0 Before the auto inspection is completed and the OL symbols are showed the measured objects cannot be clamped on The jaw planes contact must be maintained clean and should not be polished with corrosive and rough materials 2 Avoid any impact onto this Meter especially the jaw contact planes This Meter will have some buzzing sound in measurement process and it is normal Please take out the batteries in the case of the Meter being idle for a long time Respect the polarity when connecting The dismantling calibration and maintenance the Meter shall be operated by the authorized staff If the continuing use of it would be dangerous the Meter should be stopped using immediately and immediately sealed for the treatment by the authorized agencies ll Brief Introduction DY1100 DY1000 series of Pincer Ground Tester is a major breakthrough in traditional grounding resistance measurement It is widely used in the grounding resistance measurement of the power telecommunications met
4. Three Point Method As shown in the figure below in the vicinity of the measured grounding body Ra find two independent grounding bodies of better grounding state Rg and Re 17 DY1100 DY1000 series of Pincer Ground Tester can measure out the faults beyond the reach of the traditional methods and can be applied inthe occasions not in the range ofthe traditional methods DY1100 DY1000 series of Pincer Ground can measure the integrated value of the gounding body resistance and te grounding lead resistance DY1100 DY1000 series of Pincer Ground Tester is equipped with either a long jawor a shortjaw as indicated in the figure 060 A long jaw is particularly suitable for the occasion of grounding with the flat steel 11 1 Model of Series Model Jaw Range of speci fica tion m m Measurement 2 DY1100 DY1000 Long 65X32 0 01 1000 Jaw 4 2 Ranges and Accuracy of Measurement Range Resolution Auuracy 0 010 0 099 Q 0 001 Q 1 0 01 2 0 10 0 99 Q 0 01 1 0 01 2 1 0 49 90 0 12 1 5 0 12 50 0 99 5 2 0 52 2 0 59 100 199 Q 12 3 1 2 200 395 2 5Q 6 5 0 400 590 Q 102 10 10 2 600 1000 2 202 20 20 9 3 Technical Specifications Power Source 6VDC 4 5 alkaline battery Working Temperature 10 0 55 OC Relative Humidity 10 90 LCD 4 digital LC
5. decimal point 6 4 digital LCD figures display 2 Description of Special Symbols Resistance unit Data lock symbol 6 Symbol of an open jaw 8 ea ee 1 HX Symbol of an open jaw As a jaw is in the open state the symbol shows At this point trigger may be artificially pressed or the jaws have been seriously polluted and can no longer continue to measure 2 Symbol of low battery voltage when the battery voltage is As the Me nt electric circuit is s Where R is the target grounding resistance Ro is the equivalent resistance of the other entire tower grounding resistances paralleled Although strictly on the theoretical grounding because of the existence of so called mutual resistance Ro is not the usual parallel value in the sense of electrical engineering slightly higher than its IEC parallel output value But because a tower grounding hemisphere was much smaller than the distance between the towers and with a great number of locations after all Ro is much smaller than R Therefore it can be justified to assume Ro 0 from an engineering perspective In this way the resistance we measured should be R1 Times of comparing tests in different environments and different occasions with the traditional method proved that the above assumption is entirely reasonable 2 Limited Point Grounding System This is also quite common For example in some towers five 14 the follow
6. in flashing state may delay the shutdown of the Meter and keep it working In HOLD state it is required to first press HOLD key to quit from 3 Resistance Measurement After the booting auto inspection is completed it shows OL O and will be able to proceed with resistance measurement At this point press the trigger and open the jaws clamp the target loop reading to get the resistance value If the user thinks it necessary the test can be done with the ring as shown in the following figure Its show value should be consistent with the normal value on the test ring 5 1 0 The normal value on the test ringis the value at a temperature of 20 It is normal to find the difference of numerical 1 word between the show value and the nominal value For instance If the nominal value of test ring is 5 1 1 it would be normal showing 5 0 O or 5 2 11 CALI Figure 2 UL o In the process of auto jie pection DO NOT press the trigger nor open the jaw nor clamp any wire In auto inspection process be sure to maintain the natural static state of the Meter do not overturn the Meter nor impose any external force on the jaw Otherwise the accuracy of measurement cannot be guaranteed In auto inspection process if the jaws clamped around a conductor loop the measurement is not accurate Please remove conductor loop and reboot it up If there was not an OL appearing after auto inspection but a greater resistance v
7. D 47 028 5mm in length Span of Jaw 28mm for a long jaw 32mm for a round jaw Meter Quality including batteries 1320g for a long jaw 1120g for a round jaw Meter Size a long jaw is 293mm long and 90 mm wide 66mm thick a round jaw is 260mm long 90 mm wide and 66mm thick Protection Level Double insulation Structural Feature In the jaw way Range Shift Automatic External Magnetic Field lt 40A m Meter in the diferent grounding branches It is nonlinear equations with N unknown numbers and N equations It indeed has a definite solution but it is very difficult to solve the issue artificially even impossible when N larger Therefore youre expected to buy the Limited Point Grounding System Solution software produced by this Company Users can use the office computer or notebook computer to carry aut solutions In principle in addition to ignoring the mutual resistance this method does not have the measurement error caused by neglecting Ro However users need b pay attention to that in response to the number of the grounding bodies mutually linked in your grounding system it is necessary to measure the same number of the testing values for calculating o the progam not more or less And the program would output the same number of grounding resistance values 3 Single Point Grounding System From the measuring principle DY1100 DY1000 series Meter can only measure the loop resistance and the single point grounding is not
8. GROUND TESTER MANUAL ee DUOYI Table of Contents Hl SATO TT ON E EENEN SENEESE EEEE e IL Brief IntroductioN sss sss 1 1 11 61112616 111 58 4 Model of Seri S 1 Ranges and Accuracy of Measurement 5 2 3 Technical Specifications ccccecceeeeeeeeeeeeeeeee erreren 6 222115 607060282211 Reference 4 5 Variations in the nominal working range 6 7 T IV Structur f MELEK tects a aE EFE EEE 3010 5131 8 31 663 int LOD 361166 11 EEANN 2 Description of Special SyMbDOIS sss 7 3 Examples of 18 8 015 ieee VI Quick Find Table ii arao VI Operating Method ss sass t Boot o 00101010101010 2 SRUIQOWN kesa e CAD DERTE a Anka 3 Resistance Measurement 4 Data Lock Release sss sss VI Measurement Principle sss IX Measurement Method of Grounding ResistanCe
9. Reference conditions 20 3 50 RH 10 6V 0 lt 40A m lt 1V m Clamp horizontal Centred gt 10cm Non choke resistance lt 0 5 Nil 4 Reference conditions Conditions Ambient temperature Relative humidity Battery voltage External magnetic field External electric field Operating position Position of conductor in the clamp Proximity to metallic mass Loop resistance Rate of distorsion Interference current on measurement of loop resistance 5 Variations in the nominal working range Distortion 1 5 class of acc uracy per 10C 1 5 calss 0 25 calss 0 1 calss 0 5 calss 0 25 calss 0 25 calss 0 25 calss Limit of operating range 10T to 55T 10 RH to 90 RH 5 5 to From edge to centre 180 imm steel plate against jaw face 400A m 0 10KV m Distortion quantity Temperature Relative humidity Battery voltage Conductor position Clamp position Rroximity of magnetic mass Magnetic field 50 60Hz Electric field 2 IV Structure of Meter 1 Liquid Crystal Display LCD 2 Trigger to control opening and closing of jaw 3 Pincer Jaw Long jaw 65 x 32mm round jaw O 32mm E 4 POWER Key Boot Up Shutdown Quit 5 HOLD Key lock Release display si V Crystal Display 1 LCD Screen 1 Sign of low battery voltage 1 2 3 4 5 Metrication
10. alue displayed as shown in figure 4 But the test loop detection can still give out the correct result This shows that the Meter has a larger error only in measuring the major resistance e g more than 1002 whereas in measuring the small resistance it can still maintain the original accuracy users can be Ob Figure 4 rest assured in use 10
11. eorology oilfield construction and the industrial and electrical equipment DY1100 DY1000 series of Pincer Ground Tester in the measurement of a grounding system with loop does not requre breaking down the grounding wire and need no auxiliary electrode It is safe fast and simple in use First link Raand Rg with a test line use the Meter to get the first reading Second have Rg and Rc linked up as shown in the following figure Use the Meter 10 get the second reading Ra Third have Rc and Ralinked up as shown in the following figure Use the Meter to get the third reading 3 1 Two Point Method As shown in the figure below in the vicinity of the measured grounding body Ra find an independent grounding body of better grounding state Rg for example near a water pipe or a building Ra and Rg line will connect to each other using a single testing line Measured Line As the resistance value measured by the Meter is the value of the series resistance from the testing line and two grounding resistances Rr Ra Re RL Where RT is the resistance value measured with the Meter Ri is the resistance value of the testing line Meter can measure out the resistance value by connecting the test lines with both ends So if the measurement value of the Meter is smaller than the allowable value of the grounding resistance then the two grounding bodies are qualified for grounding resistance 2
12. ing formula IX Measurement Method of Grounding Resistance 1 Multi Point Grounding System As for the multi point grounding system such as electricity transmission tower grounding system grounding cable communications systems certain buildings etc They usually pass the overhead ground wire cable shie to form a grounding system 13 lower than 5 3V the symbol shows At this time it cannot guarantee accuracy of the measurements Batteries should be replaced 3 OL O symbol indicates that the measured resistance has exceeded the upper limit of the Meter 4 10 0111 symbol indicates that the measured resistance has exceeded the lower limit of the Meter 3 Examples of displays 1 Jaw is in open state and cannot measure 2 Measured loop resistance is less than 0 01 0 f IQ 3 Measured loop resistance is 5 1 0 5 fa 4 Measured loop resistance is 2 1 0 Lock the current measurement value 2 1 O VI Quick Find Table Function Key Boot Up Shutdown Shutdown Delay POWER Lock Release Display HOLD VII Operating Method 1 Boot Up Before booting up the trigger should be pressed for a couple of times to ensure the jaws are well closed Press POWER key and it is switched into the boot up state First to automatically test LCD display all its symbols show up see Figure 1 Then to start the auto inspection in this process
13. measured However users will be able to use a testing line very near to the earth electrode of the grounding system to artificially create a loop for testing The following presented is two kinds of methods for the single point grounding measurement by use of the Meter These two methods can be applied to the occasions beyond the reach of the traditional voltage current testing methods 16 towers are linked with each other through overhead ground wire Besides the grounding of some of the buildings is not an independent grounding grid but several grounding bodies connected with each other through the wire Under such circumstances the above Ro regarded as 0 will yield more error on the results of the measurement Due to the same reasons mentioned above we may ignore the impact of the mutual resistance and the equivalent resistance of the grounding resistance paralleled is calculated by the usual sense Thus for the grounding system of N N is smaller but larger than 2 grounding bodies it can offer N equations 1 R 1 1 1 Rir Ry R e Ry 1 R 1 EG 1 Ror 1 3 Ry 1 Ry 1 1 1 Ror R R Rw 1 Where R1 R2 O O Ryare grounding resistances of N grounding bodies Ri7 Re7 L O Rut are the resistances measured with the 15 External Electric Field lt 1V m Single Measuring Time 1 second Maximum Resistance Measurement Resolution 0 001 O Resistance Measurement Range 0 01 1000 0
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