MRD-XHZ Ground Fault Neutralizer

1. Introduction
   

MRD-XHZ ground fault neutralizer employs standard industrial computer system, bus-organization, multilayer PCB and full color LCD screen to provide system with stable operation, visual display, strong anti-interference capability, perfect parameter settings and information query function. 

2.Configuration

Grounding transformer, arc suppression coil with adjustable turns, load switch, micro-computer controller, SCR and trigging device, disconnector, damping resistor, voltage transformer, zinc oxide lightning rod, high voltage current limiting fuse,cabinet (indoor or outdoor), control panel, small current earthing wire line. 

3.Technical performance index

1.       Voltage class: 6KV,10KV,35KV

2.       Measuring error of capacitive current: less than 2%

3.       The residual current at single-phase earth fault: less than 5A

4.       Fault response time less than 20ms

a)         Controller power requirement: A Alternating current 220V, rated frequency 50Hz

                             A Direct current 220V/110V, rated frequency 50Hz

5.       communication interface: RS232/RS485

4.Ordering data

1.       System voltage grade: 6KV, 10KV, 35KV

2.       Arc Suppression Coil capacity

3.       The capacity of arc suppression coil is determined according to the size of the capacitive current under the single-phase grounding fault and should have a certain margin

4.       The grounding transformer capacity

5.       the quantity of zero sequence current transformer