Overview
The most common type of failure in an electrical power distribution network is a single-phase-to-earth fault. Many utilities are successfully mitigating the effects of this type of fault by the use of earth fault compensation systems. In this scheme, the system neutral is earthed through a high impedance reactor, a so called arc suppression coil which is adjusted to the earth capacitance to the network.
MRD-XHP Arc-Suppression Coil with magnetic bias Compensation Device 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.
Compared with MRD-XHZ ASC Complete Device, MRD-XHP Arc-Suppression Coil with magnetic bias Compensation Device adopts following setting mode and is without damping resistance.
Features
1. Controller adopts industrial computer platforms, dual-CPU framework and multilayer PCB processing to ensure stable and reliable operation
2. With full-color LCD screen, the running state, system capacitive current, neutral voltage, neutral current, out-of-resonance degree, residual current and fault-times of single-phase can be displayed, set and inquired conveniently
3. The device has a wide adjusting range and can be adjusted between its rated current accurately and quickly.
4. Embedded high voltage grounding line selection module employs residual incremental method and active power method making the line selection accurately and quickly
5. Equipped with RS232 and RS485 communication interface, our product can communicate with supervising computer to achieve signal teleportation
6. Our product can realize acoustic alarm of single-phase earth fault
7. Equipped with standard parallel printer, our product can finish data printing and ground information printing
8. Our product possess one system controlling two sets device function, namely, two sets of arc suppression coil in the same system can transform automatically along with the system operation
9. The operation mode of damping resistance in the Arc suppression coil parallel connection can be controlled simultaneously (optional)
Unit configuration
The main components of the unit are as follows:
1. Grounding transformer
2. Arc Suppression Coil with magnetic bias
3. Micro-computer controller
4. Current transformer
Operation conditions
1. Ambient Temp: -15℃～+45℃
2. Relative Humidity: Less than 95%
3. Altitude: less than 2000m (if excess, please specially indicate)
4. No corrosive gas around the site and no conductive dust
5. No sever shocked movement around the site
6. Micro-computer controller screen is to be installed in master control of the station. Grounding transformer, ASC device and damping resistor are to be installed outdoor or indoor with good ventilation
Technical performance
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
Ordering instructions
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
n style�~ ol�( `% e'>5. the quantity of zero sequence current transformer
Attention!
Please ensure good grounding system of the device and make different access to the ground network for the cabinet and the device. In dry areas, the ground network resistance should be measured regularly to make sure the ground resistance less than 4Ω to prevent burning loss.
