Features
Adopting high-precision through type transformers, completely isolated from the primary circuit, with high safety;
Adopting a distributed measurement structure, namely on-site measurement and digital transmission;
Adopting digital filtering methods to eliminate the "zero drift problem" caused by analog filters;
Adopting nationally produced chips, independent and reliable;
Adopting differential pulse and self-developed synchronous control algorithm to achieve distributed high-precision synchronous measurement (1uS)
High measurement accuracy, all better than the national standard requirements;
LED display screens can be used on the device to display monitoring data for easy observation.
Performance: Meets the Technical Specification for Online Monitoring Devices for Substation Equipment Part 3: Capacitive Equipment and Metal Oxide Surge Arresters (DL/T 1498.3-2016)
Power supply: AC220V;
Display: None/LED
Monitoring parameters: full current, resistive current, resistance capacitance ratio, number of actions;
Communication: RS485; Communication protocol: MODBUS-RTU;
1. Technical indicators of device operation:
working power supply |
AC220V±15% 50Hz±0.2Hz |
temperature |
-40℃~+70℃ |
humidity |
0~95% (relative humidity, no condensation) |
atmospheric pressure |
86kPa~106kPa (special requirements need to be specified in advance when ordering at an altitude>1800m) |
2. Technical indicators for device measurement:
measurement items |
measurement range |
test error |
Effective value of full current |
100uA-50mA |
± (standard reading * 2%+5uA) |
Peak value of fundamental wave of resistive current |
10uA-10mA |
± (standard reading * 5%+2uA) |
Resistance capacitance ratio |
0.05-0.5 |
± (standard reading * 2%+0.01) |
3. Remote communication
communication interface |
Communication medium |
communication protocol |
RS485 |
Twisted pair shielded cable |
Modbus (other protocols need to be specified in advance) |
4. Insulation performance
|
insulation resistance |
power frequency withstand voltage |
power port |
≥ 100M Ω (500V insulation resistance meter) |
Power frequency withstand voltage 2kV, duration 1min |
5. Electromagnetic compatibility performance
Testing Standard |
level |
criteria for judgment |
GB/T 17626.2-2006 Electrostatic Discharge Immunity Test |
Level 4 |
A/B |
GB/T 17626.3-2006 Radio frequency electromagnetic field radiation immunity test |
Level 3 |
A |
GB/T 17626.4-2008 Electrical Fast Transient Pulse Group Immunity Test |
Level 4 |
A/B |
GB/T 17626.5-2008 Surge (Impact) Immunity Test |
Level 4 |
A/B |
GB/T 17626.6-2008 Conducted Disturbance Immunity Test for Radio Frequency Field Induction |
Level 3 |
A |
GB/T 17626.8-2008 Power Frequency Magnetic Field Immunity Test |
Level 5 |
A |
GB/T 17626.9-1998 Pulse Magnetic Field Immunity Test |
Level 5 |
A |
GB/T 17626.10-1998 Damping oscillation magnetic field immunity test |
Level 5 |
A |
GB/T 17626.11-2008 Voltage Transient, Temporary Interruption and Voltage Variation Immunity Test |
|
A |