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Summary of Contents for MEWOI MEWOI3800P
- Page 1 Built-in Non-Contact Ground Resistance Online Detector MEWOI3800P...
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Page 3: Table Of Contents
CONTENT I. Brief Introduction ................1 II. Technical Specifications ..............2 III. Detector Structure and Dimensions ..........4 IV. Usage method ................5 V. The Principle and Application of Detection........6 VI. Basic Equipment ................14... - Page 4 Attention Items: Thank you for purchasing MEWOI3800P Built-in Non-Contact Ground Resistance Online Detector 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.
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Page 5: Brief Introduction
I. Brief Introduction Built-in Non-Contact Grounding Resistance Online Detector is our company devotes ourselves to Grounding resistance test tech- nical research’s another new high-tech product for more than ten years, built for online monitoring grounding down lead connection status, return circuit grounding resistance and metal return circuit connection resistance well-designed manufactured. -
Page 6: Technical Specifications
II. Technical Specifications Return circuit grounding resistance on-line monitoring, metal return resistance connection Function online monitoring, grounding condition moni- toring, ground wire and metal cable anti-theft monitoring. Power Supply Detector: DC6V~ DC9V, 50ma Max. Resistance 0.01Ω ~ 200Ω Range Resolution 0.001Ω... - Page 7 tion R+: signal output anode R-: signal output cathode I+,I-: current coil interface J2 Identifier U+,U-: voltage coil interface GND: common ground Connecting A one meter long wire(5cores shielded wire) Line Red/brown---power supply input anode; Black--- power supply input cathode; Blue---RS485 signal anode;...
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Page 8: Detector Structure And Dimensions
External Elec- < 1V/m tric Field Single Meas- urement Of About 0.5 second Time Power Con- 50ma Max. sumption Installation Grounding wire through Detector centre bore The circuit board need built into other equip- Installation ment crate, avoid rain and water logging Requirements Power Supply External power supply (Equipped by user) -
Page 9: Usage Method
6. PCB. IV. Usage method 1. Independent Installation and Use. 2. Set up Network Installation and Use According to RS232, RS485 or MODBUS-RTU communication protocol to set up a variety of networks to achieve remote monitor- ing. -
Page 10: The Principle And Application Of Detection
V. The Principle and Application of Detection 1. Testing Principle. Built-in Non-Contact Grounding Resistance Online Detector’s fundamental is measuring return circuit resistance. firstly Sensor send out a drive pulse signal to be measured ground return circuit, then measured ground return circuit responses a pulse electromotive force E, under the influence of electromotive force E there will gen- erate current I in the be measured ground return circuit. - Page 11 tion whether qualified. If grounding network A and grounding net- work B’s in parallel resistances less than engineering standard re- quired value, so grounding network A and grounding network B are all qualified. 3. Metal Return Circuit Connection Resistance Testing. If grounding network A and grounding network B up and down are connected together on the ground, then Detector measures out metal return circuit resistance’s value is very small general speaking, only...
- Page 12 ground connection and so on, they are all an integral large-scale grounding grid under the ground, meanwhile there are many grounding down lead extends to the ground, and connects the other on the ground, as the following picture. To such large-scale ground- ing grid, its grounding grid’s maximum diagonal distance is about a few hundred meters to thousands of meters, testing its grounding resistance is very difficult and troublesome.
- Page 13 4. Single Point Grounding System. If grounding network A and grounding network B is without over- head line, and doesn’t connect together on the ground, then ground- ing network A and grounding network B can regard as standalone single point grounding connection. Detector cannot test single point grounding system’s grounding resistance directly.
- Page 14 Three-point method has another advantage: Due to auxiliary ground pole B and C is parallel to the tested ground pole A, so that the actu- al grounding resistance will be less than RA to improve the tested grounding pole. RA∥RB∥RC＜RA. At the actual construction, the grounding resistance of auxiliary ground pole B and C must less than 10 times of the grounding systems engineering standard value.
- Page 15 Illustration:R1 is predicted grounding resistance, R0 is the equiva- lent resistance of all the other pole’s grounding resistance parallel ∥R ∥R ∥…∥R connection, that is R , if the greater n is (the more grounded junction), the closer R gets to 0,far smaller than R from engineering point of view, R =0,so, the data Detector receives ’s value.
- Page 16 (3). Generator Room and Launch Tower Grounding Connection. Generator Room and Launch Tower is independent outdoors gener- ally, connect both together to form second return circuit, then install detector, as the picture below. It also can add 2 auxiliary ground poles, use the three-point method to monitor.
- Page 17 (4). Construction Grounding Connection. ～R …R If R is a independent grounding body under the ground, don’t connect together, are multipoint grounding system, convenient ～R …R to test grounding resistance. If R are connected together under the ground, for the single point grounding system, testing grounding resistance in accordance with single point grounding sys- tem, direct installation test return circuit resistance, can judge grounding connection condition.
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Page 18: Basic Equipment
(5).Oil Storage Tank’s loading and Unloading Point Grounding Connection. Base on JJF2-2003<<Grounding Type Antistatic Device Test Speci- fication>>, gas station mainly need to test the grounding resistance and connect resistance of the facility shows below. Item Technical Speci- fication ≤10Ω Grounding resistance of oil storage tank ≤10Ω... - Page 19 PCB module 1PCS Connecting wire 1 Set User's Manual, Warranty Manual, Certification 1 Set -15-...
- Page 20 -16-...
- Page 21 esting pecialist -17-...
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