OMD-17.5,OMD-24
Overhead pole mounted primary metering unit
This type of metering box is an outdoor dry three-phase primary metering unit. The medium voltage metering transformer is assembled by 3 single-phase combined transformers, each single-phase combined transformer includes 1 set of CT coil, 1 set of VT coil and lightning arrester connection The seat is made of alicyclic epoxy resin (CEP) vacuum casting solid encapsulation. It has excellent insulation performance and hydrophobicity. The surface is resistant to acid and alkali corrosion, pollution, and UV. It is suitable for outdoor overhead line installation and connection to public power systems. The metering box is equipped with a meter box under the installation base, high and low voltage integrated anti-theft design, fast installation, suitable for electrical energy metering, current and voltage measurement in urban and rural power distribution network lines of equipment with a maximum voltage of 24kV and below.
1.General parameters:
| No. | item | units | specification |
| OMD-17.5 | OMD-24 |
| 1 | Highest voltage for
equipment Um (r.m.s.) | kV | 17.5 | 24 |
| 2 | rated frequency (fR) | Hz | 50, 60 or 50/60 |
| 3 | Rated lightning impulse
withstand voltage (peak) | kV | 95,110 | 125,150 |
| 4 | Rated power-frequency
withstand voltage on primary | kV | 38 | 50 |
| 5 | Rated power-frequency
withstand voltage on secondary | kV | 3 |
| 6 | Number of CTs and VTs | pcs | 3VT+3CT |
| 7 | Standard | / | IEC 61869-1:2007, IEC 61869-2:2012 IEC 61869-3:2011,IEC 61869-4:2013 |
2.Function and application.
Overhead pole mounted primary metering unit Comply with the latest applicable industry standards and local and/or national electrical regulations (such as IEC, IEEE (ANSI), CAN, GOST, CEF). It is used for three-phase overhead power grid energy measurement management and distribution network automation management system. The primary side measurement is more accurate, and the power loss of the line can be effectively measured to reduce losses.
3.Main features
3.1.The medium voltage transformer of the metering unit is composed of 3 single-phase combined transformers, which saves installation space. There is a meter box under the installation base. The high and low voltage integrated anti-stealing design can be installed directly and convenientlyon the pole outdoors.
3.2.The metering unit is equipped with a meter box and connected to the transformer connection. The meter and communication module installation space are reserved in the box, and the meter box door switch, proximity sensor, data debugging port, conversion switch, and door lock seal structure are reserved. To prevent electricity theft.
3.3.The meter box body is made of corrosion-resistant alloy aluminum or low-carbon steel with the same performance and hot-dip galvanized, and the sealing design is weatherproof, acid and alkali corrosion resistant, and UV resistant;
3.4.The medium voltage combined transformer is insulated with epoxy resin solid encapsulation, the surface is dirt-resistant, UV-resistant, has excellent dielectric and mechanical properties, no oil, no gas, and maintenance free, meeting the requirements of safe operation and environmental protection.
3.5.The CT of the medium voltage combined transformer can be configured double transformation ratios, and it is convenient to set the conversion switch to change the transformation ratio. The VT is equipped with anti-short circuit and overload protection design to avoid burning and explosion caused by VT short circuit and overload.
3.6 The cable for the overhead line has been connected to the primary end, and the cable of the corresponding area and length can be configured according to user requirements.
4.Technical parameters.
Current transformer specifications
| No | Item | characteristic |
-
| Rated primary current | 5A up to 1200A |
-
| Rated secondary current | 5Aor1A |
-
| Rated Continuous Thermal Current | 120%,125%,150%,200%,etc. |
-
| Rated Short time current (Ith) (thermal 1 second) | 80xIpr,100xIpr |
-
| Rated Dynamic Current (Idyn) | 2.5xIth |
-
| Rated Output(VA) | 5,10,12.5,15,20 |
-
| Accuracy Class | 0.2S,0.2,0.5S,0.5,1 Metering |
-
| Instrument Security Factor (FS) | 5,10,20 |
-
| Applicable Standard | IEC: 61869-1&2 |
Voltage transformer specifications
| No | Item | characteristic |
| OMD-17.5 | OMD-24 |
-
| Rated primary voltage(V) | 13200/√3,13800/√3, 15000/√3,7200,8400,etc. | 20000/√3,22000/√3, 14400, etc. |
-
| Rated secondary voltage(V) | 100/√3,110/√3, 115/√3, 120/√3, 110,115,120 |
-
| Rated Voltage Factor | 1.2/Continuous 1.5/30s,1.9/30s,1.9/8h 1.5/30s,1.9/30s,1.9/8h |
-
| Standard connection | Y-Y connection |
-
| Rated Output(VA) | 15,20,25,30,50,75 |
-
| Accuracy Class | 0.2,0.5,1,3 Metering |
-
| Thermal burden(VA) | 500 |
-
| Applicable Standard | IEC: 61869-1&3 |
If the parameter requested exceeds the range of the above table, it can be determined after negotiation with our company.
5.Dimensions and wiring schematic diagram.
6.Special instructions.
The company can design and manufacture specially according to the special requirements of customers.
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