ETCR2800B Non-Contact Earth Resistance Online Detector Manufacturer & Supplier

Overview
Specification
Application
Relate Model
Download

Overview

ETCR2800B Earth Resistance On - line Detector is high-tech product that our company has devoted to "grounding resistance detection technology research" for more than ten years, specially design and manufacture for online monitoring grounding down lead connection status, circuit grounding resistance and metal circuit connection resistance. ETCR2800B is closed loop structure, convenient and efficient. On-line testing, non-contact measurement, grounding wire pass through the perforation of the detector, definitely not influence grounding for lightening effect and normal operation, real time on-line testing. Use by RS485 wire communication or GPRS wireless communication data transmission, realize remote online monitoring .Detector built-in sensor and circuit board, completely sealed, ensure high-accuracy, high stability and high reliability of long time on-line monitoring at field and indoors.

ETCR2800B Earth Resistance On - line Detector suitable for transmission line tower grounding; Meteorological lightning protection grounding; Petrochemical grounding; Communication grounding; Substation grounding; Railway facilities grounding; Construction warehouse grounding; Metal circuit resistance; Electrical equipment grounding etc.

ETCR2800B Earth Resistance On - line Detector could set up wired and wireless network system. Wired network system through RS485 communication protocol to transmit data, build up by the detector, 【communicator, monitoring software, power adapter, computer(above equipment need the user provide and secondary development) 】and other components; Suitable for short-distance ground resistance monitoring. Wireless network system through GPRS communication protocol to transmit data , build up by the detector(built-in GPRS transceiver module), 【SIM communication card, monitoring software, power adapter, computer(above equipment need the user provide and secondary development)】 and other components for long-distance ground resistance monitoring. Wired network system is suitable for monitoring within 1,500 meters distance, wireless network system is not subject to distance restrictions.

ETCR2800B Accessories

Detector
Fix Screw
RS485 Communication Wire
Warranty card/Qualification card
Paper Box

Specification

Technical Parameters

Function	Description
CT structure	Closed loop(B\C Model);Spilt core(KB\KC Model)
Power Supply	Detector：6VDC～12VDC，50mA Max(GPRS 12VDC 150mA Max). (Ui：6V；Ii：50mA；Ci:0μF；Li:0mH；Pi：0.1W)（User supply) ，Instrument and safety barrier matching relation：Uo≤Ui，Io≤Ii，Po≤Pi，Co≥Ci，Lo≥Li。
Resistance Range	0.01Ω~200Ω(ETCR2800B\ETCR2800C)
Resistance Range	0.01Ω~100Ω(ETCR2800KB\ETCR2800KC)
Resolution	0.001Ω
Accuracy	±2%rdg±3dgt(20℃±5℃，below 70%RH)
CT Size	60mmx28mm
Overflow Indication	B/C model: test data>200Ω, system software or LCD display “OLΩ” symbol;
Connection line	1pcs ,1 meter cord(5 core wire)
Connection Identifier	Red/brown---power supply input anode; Black--- power supply input cathode; Blue---RS485 signal anode; Grey---RS485 signal cathode; White--- grounding wire shield (power supply input cathode can connects with analog grounding by short circuit connection)
Communication Method	Wired network: RS485 communication protocol(support MODBUS) Wireless network: RS485 or GPRS communication protocol(support MODBUS)
Network Points	Wired network: 1 ~ 250 grounding points, scalable Wireless network: 60000 grounding points, can be expanded
Communication distance	Wired network: about 1500m,scalable Wireless network: not limited
Alarm Indication	B/KB model: the detector sound-light alarm C/KC model: detector sound-light alarm and LCD display
Alarm Setting	B/KB model: System Software Settings C/KC model: detector panel settings, system software settings
Data Display	B/KB model: Non(connect RS485 interface and read data) C/KC model: 4- digit LCD display directly
LCD size	47mm×28.5mm(only C/KC model)
Dimensions	Detector: 144mm × 130mm × 84mm(B/C model) Detector: 125mm × 119mm × 80mm(KB/KC model)
Weight	Detector: 1KG
Working Temperature And Humidity	-20℃~55℃; 20%RH~90%RH
Humidors Error	Within 5%
Shift	Automatic shift
Grounding Lead Interference Current	Should be avoid
External Magnetic Field	<40A/m
External Electric Field	<1V/m
Single Measurement time	About 0.5 second
Working current	Detector: 50mA Max.(GPRS: 12VDC 150mA Max)
Explosion-proof mark	Ex ia ⅡB T3 Ga
Explosion-proof Certification	CE18.2332X.
Protection Level	IP54
Power Supply Mode	External power supply (Equipped by user)

Application

Installation

Network Structure

Wired Network System (Self -Development Software)

Wired network system through RS485 communication protocol to transmit data, build up by the detector, 【communicator, monitoring software, power adapter, computer (above equipment need the user provide and secondary development) 】and so on, suitable for short-distance 1500 meters grounding resistance monitoring.

Wireless Network System (Self -Development Software)

Wireless network system through GPRS communication protocol to transmit data ,build up by the detector(built-in GPRS transceiver module), 【SIM communication card, monitoring software, power adapter, computer(above equipment need the user provide and secondary development)】 and other components for long-distance ground resistance monitoring., distance is not limited.

Principle & Application

Test Principle

ETCR2800 Earth Resistance On - line Detector, basic principle of measuring the grounding resistance is to measure the loop resistance. Firstly sensor send out a drive pulse signal to the measured ground return circuit, then measured ground return circuit responses a pulse electromotive force E, under the influence of electromotive force E will generate current I in the be measured ground return circuit. Sensor measures E and I value, and gets resistance value of be measured ground loop circuit through the formula: R=E/I.

Loop Resistance & Metal Loop Connection Resistance Tesing

Loop resistance is a composite value includes A point grounding resistance value, grounding down lead metallic conductor’s resistance value, metal overhead line’s resistance value, connection resistance value (contact resistance) between grounding down lead and metal overhead line, B point grounding resistance value.

If grounding network A and grounding network B up and down are connected together on the ground, Detector measures out the resistance value of metal return circuit is very small in general situation, only few of and less than one Ohm, this is the metal loop connection resistance, as a equipotential resistance, but not grounding resistance. Therefore the detector is much convenient to test metal return circuit connection resistance.

Test Method

Single point grounding system: If between grounding network A and grounding network B haven`t overhead line, and not connect together on the ground, then grounding network A and grounding network B can regard as standalone single point grounding connection. Detector cannot test the grounding resistance of single point grounding system directly, will display “OL” overload symbol. Therefore it needs adding one or more auxiliary grounding electrode, to form multipoint loop circuit.

Three point grounding system: In the following figure, the tested ground pole is A and the other two auxiliary ground pole is B and C. The poles A, B, C are connected together on the ground. In the three ground poles grounding down leads were installed on a detector, can accurately test the ground point A resistance value.

Calculated as follows:

R1=RA+RB//RC-------- (1)；

R2=RB+RA//RC-------- (2)；

R3=RC+RA//RB-------- (3).

Relate Model

Model	Structure	Alarm Setting
ETCR2800B	Closed Loop	System Setting
ETCR2800C	Closed Loop	Yes
ETCR2800KB	Spilt Core	Special Setting
ETCR2800KC	Spilt Core	Yes
ETCR2800N	Closed Loop Built-in Type	Special Setting
ETCR2800T	Stainless Steel Housing	Special Setting