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INTRODUCTION
ETCR2900 Contact Type On-line Earth Resistance Tester is high-tech product that our company has devoted to "Earth Resistance Detect Technology Research" for more than ten years, Adopt precision 3-wire or simple 2-wire measurement method to test the earth resistance. Adopt average value rectification method to test grounding voltage, online detection, real-time monitoring. User can select RS232 or RS485 communication, according the protocol MODBUS to secondary development, build the network, realize remote multipoint online monitoring etc. ETCR2900 Contact Type On-line Earth Resistance Tester displayed by super large LCD, very clear and obvious. The alarm critical value can be set via the button, and with the sound and light alarm indication. Ensure the high accuracy, high stability and high reliability of real-time online monitoring of grounding resistance value in various place. ETCR2900 Contact Type On-line Earth Resistance Tester suitable for transmission line tower grounding, underground mine equipment grounding , weather lightning protection grounding, petrochemical grounding ,communication base station grounding, power substation grounding , railway grounding , building warehouse grounding , electrical equipment grounding, etc. |
ETCR2900 Accessories
Detector
9P wiring terminal
Warranty card/Qualification card
Paper Box
SPECIFICATION
Measurement Range & Accurancy
Measurement Function | Range | Accuracy | Resolution |
Earth Resistance | 0.01Ω～20Ω | ±2%rdg±3dgt (auxiliary earth resistance 100Ω±5%，Voltage to earth＜10V) | 0.01Ω |
0.1Ω～200Ω | ±2%rdg±3dgt (auxiliary earth resistance 100Ω±5%，Voltage to earth＜10V) | 0.1Ω | |
1Ω～2000Ω | ±2%rdg±3dgt (auxiliary earth resistance 100Ω±5%，Voltage to earth＜10V) | 1Ω | |
Earth Voltage | 0～600V AC | ±2%rdg±3dgt | 1V |
(Note: 23℃±5℃，below 75%rh)
Technical Parameter
Function | Description |
Application | Online monitoring of grounding resistance, grounding voltage, equipotential bonding resistance, and low value resistance |
Power Supply | Standard: 12V±1VDC、400mA Max; Optional: 24V±1VDC |
Test Method | precision 3-wire or simple 2-wire measurement method |
Measurement Method | Ground Resistance ：Rated current pole method, measuring current 11mA Max，128Hz； |
Ground Voltage：Average rectification | |
Data Mode | Average value |
Display Mode | 4 Digits large LCD display |
Measurement Indication | In measurement, LCD count down indication |
LCD size | 128mm×75mm; Display area:124mmX67mm |
Tester Dimension | 190mm×117mm×54mm |
Measurement Time | Voltage to earth: about 2 times/seconds; Grounding resistance: about 30seconds/times |
Measurement Times | Above 10,000 times |
Line Voltage | Measurement voltage to earth: AC below 600V |
Tester Interface | Plug Terminal Block: 9-pin terminal block |
Data Communication | RS485 (optional RS232). |
Shift | Automatic shift |
Data Storage | 400 sets, flashes display "FULL" symbol indicate that storage full |
Interval time | Automatic monitoring interval time of setting range: 1 ~ 999 hours |
Data Access | Data access function: display "READ" symbol |
Overflow Indication | Over range overflow function: display "OL" symbol |
Power Consumption | Standby：25mA Max |
Measurement：400mA Max | |
Alarm Indication | audible and visual alarm |
Power Voltage | When power voltage lower than 10V, display low power voltage symbol, and remind to replace battery |
Tester Weight | 450g |
Working Environment | -10℃~40℃；below 80%rh |
Store Environment | -20℃~60℃；below 70%rh |
Overload Protection | In measurement of ground resistance：E-P、E-C AC 280V / 3 seconds between each terminal |
Insulation Resistance | above 10MΩ (500V between circuit and outside shell) |
Withstand Voltage | AC 3700V/rms (Between the circuit and the shell) |
Electromagnetic characteristics | IEC61010-4-3，Wireless frequency electromagnetic field≤1V/m |
Suitable Safety Standard | IEC61010-1、IEC1010-2-31、IEC61557-1,5、IEC60529(IP54)、Pollution 2、CAT Ⅲ 300V |
Structure & Size
Principle & Application
Measurement Principle
1.Earth voltage measurement adopts average value rectification method.
2.Earth resistance measurement adopts rated current change-pole method.
That is, the AC rated current I (11mA Max，128Hz) flows between the measuring
object E (ground electrode) and the C (current electrode); Get the potential difference
V between the E and the P (voltage electrode), and then get the grounding resistance
value Rx according to the formula: R=V/I.
3.The working error (B) is the error obtained within the rated working conditions, which is calculated from the inherent error (A) and variation error (Ei).
A： Intrinsic error E1: Variation due to position change
E2：Variation due to power supply voltage change E3：Variation due to temperature change
E4：Variation due to interference voltage change E5：Variation due to contact electrode resistance change
E7: Variation due to system frequency change E8: Variation due to system voltage change
Wiring Connection & Measurement Method
1.First: the user needs to make auxiliary grounding poles P and C every 5 ~ 10 meters on the same straight line near the monitored grounding pole E. Auxiliary grounding pole should adopt grounding materials or stainless steel material, prevent rust and rot, the grounding resistance value as small as possible, the general grounding resistance requirements no more than 100 Ω, ground voltage is less than 10V, so as to ensure the accuracy of the on-line monitoring.
Secondly: according follow table to connect the detector, computer, power supply, etc. It`s better that the connection between the detector and the auxiliary earth pole secured by electric power wire (for later maintenance and disassembly), or by welding.
2.The grounding resistance on-line monitoring usually adopts the precise three-wire method, but also can use the simple two-wire method to test. The simple two-wire method is used to measure the grounding resistance by using the existing grounding electrode which grounding resistance value is smaller as the auxiliary grounding electrode and short-connecting the C and P interfaces. Auxiliary grounding rods C and P can be instead by metal water pipes, fire hydrants and others metal embedded objects, common grounding of commercial power systems or lightning protection grounding poles of buildings, etc. During measuring, pay attention to removing the oxide layer at the connection point of the selected metal auxiliary grounding body. Simple two wires method wiring connection as right side figure:
The simple method measure the grounding resistance, the tester reading is the sum of the grounding resistance of the grounded body to be measured and the grounding resistance of the commercial grounding body.
R=RX＋re
Which: R --- The tester reading value;
RX ---The grounding resistance value of measured grounding object;
re--- the grounding resistance value of a common grounding body such as a commercial power system.
Then, the earth ground resistance value of measured grounding body is:
RX=R－re
Use simple method to measure the grounding resistance, try best to select the grounding body with a smaller re value as the auxiliary grounding electrode, so that the detector reading is closer to the real value.
Related Series Model
| Model | Range | LCD Size | Difference |
| ETCR2900 | 0.01Ω~2000Ω 0-600V AC | 128mm×75mm | Can build the Wired Network System |
| ETCR2900B | 0.01Ω~2000Ω 0-600V AC | 47mm×28.5mm | Can build the Wired Network System and Wireless Network System |
