Technical index
1 Reference temperature and humidity
The reference temperature was 23C; The reference humidity is (40 ~ 60) %RH.
2 Temperature and Humidity Range
The climatic conditions for normal operation of concentrator equipment are shown in the table.
| Type of premises |
level |
Air temperature |
humidity |
| Range: °C |
The maximum rate of change is a°C/h |
Relative humidity b% |
Maximum absolute humidity g/m3 |
| outdoors |
C3
|
-40～+70
|
1
|
10～100
|
35
|
| a The temperature change rate is taken as the average value in 5 minutes. B. Relative humidity includes condensation. |
3 Atmospheric Pressure
66.0kPa ~ 108.0kPa (altitude 4000m and below), except for special requirements
4 Mechanical effects
Concentrator equipment can withstand mechanical vibration and shock under normal operation and conventional transportation conditions without causing failure and damage. Mechanical vibration strength:
-- Frequency range: 10Hz ~ 150Hz;
-- Displacement amplitude: 0.075mm (frequency ≤60Hz);
-- Acceleration amplitude: 10m/s2 (frequency > 60Hz).
5 Working power supply
Ac single-phase power supply.
6 Rating and allowable deviation
Rated voltage of working power supply: 220V, allowable deviation -20% ~ + 20%; Frequency: 50Hz, allowable deviation -6% ~ + 2%.
7 Power consumption
In the non-communication state, the apparent power consumed by the concentrator should not be greater than 5VA and the active power should not be greater than 3W.
8 Power loss data and clock retention
After the concentrator power supply is interrupted, it can communicate with the main station three times (immediately report the power failure event after the power failure) and work normally for 1min, and keep the data and clock for two months. When the power supply is restored, the saved data is not lost and the internal clock runs properly.
9 Grounding fault resistance
When the power supply of the concentrator is supplied by the three-phase four-wire distribution network which is not effectively grounded or the neutral point is not grounded, the two relative ground voltages without grounding will reach 1.9 times the nominal voltage when the ground fault and relative overvoltage of 10% are generated. In this case, the concentrator will not be damaged. After the power supply is restored, the concentrator can work normally and the saved data is unchanged.
10 Insulation resistance
The insulation resistance requirements of each electrical circuit of concentrator to ground and between each electrical circuit are shown in Table 2:
Table 2 Insulation resistance
| Rated insulation voltage V |
Insulation resistance MΩ |
Test voltage V |
| Normal conditions |
Hot and humid conditions |
|
U≤60
|
≥10
|
≥2
|
250
|
|
60＜U≤250
|
≥10
|
≥2
|
500
|
|
U＞250
|
≥10
|
≥2
|
1000
|
| Note: The interface circuit directly connected to the secondary equipment and the external circuit adopts the requirements of U>250V. |
11 Insulation Strength
The power supply loop, AC power input loop and output loop can withstand the 50Hz AC voltage specified in Table 3 and the insulation strength test lasting 1 min between each circuit of ground and electrical isolation and the normally open contact loop of the output relay. No breakdown or flashover occurred during the test, and the leakage current was less than 5 mA.
12 Impulse voltage
The power supply loop, AC power input loop, and output loop can withstand the peak impulse voltage specified in Table 4 between each circuit with no electrical connection, and the positive and negative polarity are 5 times each. No destructive discharge (breakdown flashover, flashover or insulation breakdown) occurred during the test.
13 Electromagnetic Compatibility
The concentrator can withstand the electromagnetic harassment of conduction and radiation and the influence of electrostatic discharge, the equipment is not damaged, and can work normally.
14 Electrical clearance and creepage distance
The bare live part shall have the minimum electrical clearance and creepage distance specified in Table 6 between the exposed live part and other live parts, and between the terminal screw and the metal cover plate.
15 temperature rise
The concentrator power supply loop is loaded with 1.15 times the rated voltage, and the temperature rise of the outer surface does not exceed 25K when the ambient temperature is 40℃.
16 Service life
The normal service life of concentrator is more than 10 years.
17 Continuous power stability
The concentrator is powered on continuously in the normal working state for 72h, and the sampling test is carried out every 8h during 72h, and its function and performance meet the relevant requirements.
18 Reliability
The mean trouble-free operating time (MTBF) of the concentrator is greater than 7.6×104h.
19 Accuracy of data acquisition
When the concentrator directly collects the data of the watt-hour meter, the accumulated electric energy reading of the watt-hour meter collected by the concentrator is consistent with the electric energy representation value.
20 Success rate of data collection
In the environment where the energy meter and wiring are normal, the success rate of collecting energy meter data by the concentrator can reach 100%.
