17.5-36kV medium voltage overhead column installed with a metering box with a test terminal junction box, JLSZXW8-17.5/24/36 type combined transformer

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17.5-36kV medium voltage overhead column installed with a metering box with a test terminal junction box, JLSZXW8-17.5/24/36 type combined transformer

This type of metering box is an outdoor dry three-phase primary metering unit. The medium voltage metering transformer is assembled by three single-phase combination transformers. Each single-phase combined transformer includes 1 set of CT coil and 1 set of VT coil. Using alicyclic epoxy resin (CEP) vacuum casting solid encapsulation, 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 the public power system. The metering box has all connected the secondary leads of the transformer and gathered them in the junction box with the test switch terminal block. The junction box has a door lock and anti-theft design, which is quick and easy to install. It is suitable for electrical energy measurement, current and voltage measurement in urban and rural power distribution network lines with the highest voltage of 17.5/24/36kV and below.

DESCRIPTION

OMA-17.5F,OMA-24F,OMA-36F

Overhead pole mounted primary metering unit

1. Basic parameters:

No.	item	units	specification
1.	Highest voltage for equipment Um (r.m.s.)	kV	17.5	24	36
2.	rated frequency (fR)	Hz	50, 60 or 50/60
3.	Rated lightning impulse withstand voltage (peak)	kV	95kV，110 kV	125 kV，150 kV	170 kV，200 kV
4.	Rated power-frequency withstand voltage on primary	kV	38	50	70
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 IEEE C57.13-2016

2. Product function and use:

Overhead pole mounted primary metering unit complies with the latest applicable industry standards and local and/or national electrical regulations (IEC, IEEE (ANSI), CAN, GOST, CEF). Used for three-phase overhead power grid energy metering management, 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 the loss.

3. Main features of the product:

1. The medium voltage transformer of the metering unit is composed of 3 single-phase combined transformers, which saves installation space. It is convenient and quick to install directly on the pole outdoors.

2. The metering unit is equipped with a junction box that has installed the test terminal block and the lead wire connected to the transformer. The junction box door lock seal structure is designed to prevent electricity theft. At the same time, it can also be equipped with an electric meter box on the column.

3. The meter box body is made of stainless steel or corrosion-resistant low-carbon steel with the same performance, and the sealing design is weatherproof. The surface is coated with anticorrosive paint powder layer, which is resistant to acid and alkali corrosion and UV.

4. The medium voltage combined transformer is insulated with epoxy resin solid encapsulation, and the surface is dirt-resistant and UV-resistant. It has excellent dielectric and mechanical properties, no oil, no gas, no maintenance. It can meet the requirements of safe operation and environmental protection.

5. The CT of the medium voltage combined transformer can be configured with dual ratios. VT can choose anti-short circuit and overload protection design to avoid burning and explosion caused by VT short circuit and overload.

6. One connection uses NEMA contact bar and wiring clamp connection. The terminal block of the corresponding area can be configured according to user requirements, and the lightning arrester can be selected as required.

4. Product technical parameters:

Current transformer specifications

No	Item	规格参数
1.	Rated primary current	5A up to 1200A
2.	Rated secondary current	5A或1A
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	规格参数
1.	Rated primary voltage（V)	13200/√3, 13800/√3, 8400, etc.	20000/√3, 22000/√3, 14400, etc.	33000/√3，35000/√3, 20125, 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	500	750
8.	Applicable Standard	IEC: 61869-1&3