17.5(24)kV Overhead Pole Mounted Metering Box with Primary Cable and Arrester Seat,JLSZY2-17.5(24) Combined Transformer

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17.5(24)kV Overhead Pole Mounted Metering Box with Primary Cable and Arrester Seat,JLSZY2-17.5(24) Combined Transformer

This type metering box for outdoor dry-type three-phase primary metering unit, combined by three single phase transformers medium voltage measuring transformer assembly, each combination of single-phase combined CT&VT contains 1 set of CT coil and 1 set of VT coil, adopting alicyclic epoxy resin (CEP) vacuum pouring solid encapsulation, Cyclic epoxy resin (CEP) vacuum casting solid encapsulation, with excellent insulation performance and hydrophobicity, the surface is resistant to acid and alkali corrosion, pollution, and UV. It’s suitable for outdoor overhead line is connected to the public power system installation. The meter box is equipped with a meter box under the installation base of the metering box. The high and low voltage integrated anti-theft design is fast and easy to install. It is suitable for electrical energy metering, current and voltage measurement in urban and rural power distribution network lines with a maximum voltage of 24kV and below.

DESCRIPTION

OMF-17.5,OMF-24

1.General parameters

No.	item	units	specification
No.	item	units	OMF-17.5	OMF-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

3.1The 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

3.2The 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

3.3The meter box body is made of corrosion-resistant alloy aluminum or low-carbon steel hot-dip galvanized, and the sealing design is weatherproof, acid and alkali corrosion resistant, and UV resistant

3.4The 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.

3.5The 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

3.6The 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
1.	Rated primary current	5A up to 1200A
2.	Rated secondary current	5Aor1A
3.	Rated Continuous Thermal Current	120%,125%,150%,200%,etc.
4.	Rated Short time current (Ith) (thermal 1 second)	80xIpr,100xIpr
5.	Rated Dynamic Current (Idyn)	2.5xIth
6.	Rated Output(VA)	5,10,12.5,15,20
7.	Accuracy Class	0.2S,0.2,0.5S,0.5,1 Metering
8.	Instrument Security Factor (FS)	5,10,20
9.	Applicable Standard	IEC: 61869-1&2

Voltage transformer specifications

No	Item	characteristic
		OMF-17.5	OMF-24
1.	Rated primary voltage（V)	13200/√3，13800/√3, 15000/√3,7200,8400,etc.	20000/√3，22000/√3, 14400, etc.
2.	Rated secondary voltage(V)	100/√3，110/√3, 115/√3, 120/√3, 110,115,120
3.	Rated Voltage Factor	1.2/Continuous 1.5/30s,1.9/30s,1.9/8h 1.5/30s，1.9/30s，1.9/8h
4.	Standard connection	Y-Y connection
5.	Rated Output(VA)	15,20,25,30,50,75
6.	Accuracy Class	0.2,0.5,1,3 Metering
7.	Thermal burden(VA)	500
8.	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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