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1. General Description
- Shunt is one of the main current sensor used in kWh meter, especially in single phase kWh meter.
- There are 2 types of shunt-Braze weld shunt and electron beam shunt.
- Electron beam weld shunt is a new technology product.
- E-B weld has strict requirement to manganin and copper materials, the shunt by E-B weld is in high quality.
- E-B shunt is more and more popular and extensively used to replace the old braze weld shunt worldwide.
2. Features
- High accuracy: Error is at 1-5%. It's easy to work out class 1.0 meter
by using E-B shunt
- High linerarity: The linerarity is high so the resistance value change
is at a narrow band.
Production cost could be reduced because the meter calibration is very easy and quick.
- High reliability: The manganin and copper was melted to be in one body
by high temperature electron beam,
so the copper and manganin will never depart during the operation of the meter.
- Small self-heat: No solder between copper and
manganin,
so there isn't additional heat on the shunt.
The copper used in E-B shunt is pure, It has good ability of standing current;
very even thickness make the contact resistance is the smallest;
Enough section area and surface area will give out the slef heat quickly.
- Low temperature coinfidence: temperature coinfidence is smaller than 30ppm
from -40¡æ--+140¡æ, there is very minor resistance value change at different temperature conditions.
- Resistant to oxidation: special material is coated on the copper to pretect from
the oxidation
- Long term stability: the good performance is stable within 20 years
- Resistant to lightning strike: It can pass test of 3000A 10ms lightning strike test.
- Small size and low weight make the shunt assembly more easy, transport cost lower.
- E-B shunt cost is related with its structure. Reasonable design is important for
low cost.
3. Types and Dimensions
4. Specifications
| KWh Meter
| Shunt
|
| Current Range
| Class
| Weld
| Thickness
| Typical value (u¦¸)
| Error
|
| 5(30)A |
1.0/2.0 |
E-B weld |
1.0mm |
400-600 |
1-5% |
| 10(40)A |
1.0/2.0 |
E-B weld |
1.0mm |
300-500 |
1-5% |
| 5(50)A |
1.0/2.0 |
E-B weld |
1.0-1.2mm |
250-400 |
1-5% |
| 10(50)A |
1.0/2.0 |
E-B weld |
1.0-1.2mm |
200-350 |
1-5% |
| 5(60)A |
1.0/2.0 |
E-B weld |
1.0-1.5mm |
200-400 |
1-5% |
| 10(60)A |
1.0/2.0 |
E-B weld |
1.0-1.5mm |
150-350 |
1-5% |
| 10(80)A |
1.0/2.0 |
E-B weld |
1.5mm |
150-250 |
1-5% |
| 20(80)A |
1.0/2.0 |
E-B weld |
1.5mm |
150-250 |
1-5% |
| 10(100)A |
1.0/2.0 |
E-B weld |
1.5-2.0mm |
100-250 |
1-5% |
| 20(100)A |
1.0/2.0 |
E-B weld |
1.5-2.0mm |
100-250 |
1-5% |
| 30(100)A |
1.0/2.0 |
E-B weld |
1.5-2.0mm |
100-250 |
1-5% |
5. Character Curve
6. Part No., for example:
- General name. E-B shunt
- Type. Like A,B,C,D,E,F,G¡¡
- Thickness of the shunt 10=1.0mm, 15=1.5mm, 20=2.0mm
- Shunt resistance value. Like 300uohm, 200uohm
- Length of the shunt. Like 32mm
- hole to hole Central distance, like 21mm
- hole diameter, like 4.5mm
- Different Variants when above are all same. Variant 1,2,3¡¡
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