China New Product XJM7-K Measuring Box (Outdoor Street Lamp Measurement Control Box) to Naples Manufacturers


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In order to best meet client's needs, all of our operations are strictly performed in line with our motto " High Quality, Competitive Price, Fast Service " for China New Product XJM7-K Measuring Box (Outdoor Street Lamp Measurement Control Box) to Naples Manufacturers, We are sincere and open. We look forward to your visit and establishing trustworthy and long-term standing relationship.


XJM7-K measuring cabinet (outdoor street lamp measurement control box) is suitable in power supply line with AC 50HZ, rated voltage(0-380V), as the street lights control of industrial mine, residential quarters, schools and other buildings. Also can be used for control neon lights , underwater lighting, Street lights on/off time and with leakage protection.

In line with GB7251.1-1997 and GB7251.3-1997 standards.

3C certificate:

XJM7-K Measuringdhxvs-1


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Generally a current transformer is used mainly for measuring current and protection of the system which includes EHT and HT
feeders or Power transformers in a substation or generating stations.

Current transformers are used for measuring current in the circuit system in such a way that it merely reduces a
large current flowing through its primary to a smaller current which can be read by an ammeter connected to its secondary.

it electrically isolates the secondary circuit from the primary high-voltage circuit allowing measurements to be made,
or protective devices to operate, safely.

The primary circuit is largely unaffected by the insertion of the CT.
The rated secondary current is commonly standardized at 1 or 5 amperes.
For example, a 4000:5 CT would provide an output current of 5 amperes when the primary was passing 4000 amperes.
The secondary winding can be single ratio or multi ratio, with five taps being common for multi ratio CTs.
The load, or burden, of the CT should be of low resistance.

In normal case a CT consists of a single core in High voltage side and 4 cores in low voltage side.

Representation of windings of the secondary of the Ct is given as

1S1(R) 1S1(Y) 1S1(B) 1S2(RYB-N) cores of each phases(R,Y,B) forms C core

2S1(R) 2S1(Y) 2S1(B) 2S2(RYB-N) cores of each phases(R,Y,B) forms D core

3S1(R) 3S1(Y) 3S1(B) 3S2(RYB-N) cores of each phases(R,Y,B) forms A core

In the case of EHT feeders three secondary cores are used and the 4th one is taken as a spare and shorted.
Three cores are categorized as
1) A core – for Distance protection
2) D core – for metering
3) C core – for back up protection (over-current & earth fault)

In the case of power transformers 4 cores are used as follows
1) A core – for Differential protection
2) D core – for metering
3) C core – for back up protection (over-current & earth fault)
4) AB core – for restricted earth fault protection

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