CN2195790Y - High-precision ordinary electric current mutual-inductor - Google Patents

Abstract

The utility model provides a high precision ordinary electric current mutual inductor, which can reach to the precision of 0.1 level and 0.2 level. The utility model is characterized in that an annealing treated cold rolling orientating silicon steel sheet is used as the iron core, the ratio of the turn number to the winding length of a coil bobbin reaches to 1.063-0.92 turn / millimeter, both ends of the coil bobbin have no baffle plate, under the conditions that the cost and the mounting dimension are not increased basically, the utility model can replace the current mutual inductor with a precision of 0.5 level, and the utility model can meet the requirements of the switch cabinet and the distribution box, the switch cabinet and the distribution box are respectively provided with an electric energy meter with a precision of 1.0 level and an ammeter.

Description

High-precision ordinary electric current mutual-inductor

The utility model belongs to the electric energy metrical instrument, especially for the electric energy metrical that uses 1.0 grades of electric energy meters.

Instrument transformer has reached higher level as the reference instrument of electric energy metrical.China can make 1 * 10 at present ^-5The volume threshold currents instrument transformer of precision.That it uses is magnetic permeability μ.The permalloy of＞80000H/m.The 0.5 grade of common current instrument transformer that is used for switch cubicle, power distribution cabinet in a large number, owing to have ready-made drawing, production technology is simple, and manufacturer spreads all over the whole nation, and the market recoverable amount is very big.At present, users have been extensive use of 1.0 grades of electric energy meters, therefore require the current transformer of adapted more than 0.2 grade to replace 0.5 grade of mutual device of electric current.As use the manufacturing of high-permeability material permalloy, precision is easy to satisfy, but price is too high, and the user can't accept.0.5 the ordinary construction of level current transformer is: shear slivering with cold rolling or hot rolling non-oriented silicon steel sheet, tens of build up rectangle, constitute iron core, form a closed magnetic path.Be wound with winding and secondary winding on the arm of rectangle iron core, have only secondary winding on another relative arm.Winding conducting wire all has on the bobbin of plate washer around two ends.For compressing silicon steel sheet, at four jiaos of rectangle iron core, a hole is arranged respectively, to insert with screw rod, two ends are fastening with bullet pad nut.Now use the common current instrument transformer, power consumption is bigger, and magnetic state is not good enough, and the leakage field phenomenon is serious, and precision can't reach more than 0.2 grade.

The purpose of this utility model is exactly not improve the current transformer price and do not changing under the condition of overall dimension, improve the precision of current transformer, the position and the space of device current transformer in original switch cubicle, power distribution cabinet, replace 0.5 grade of current transformer with 0.1,0.2 grade of current transformer, reach the purpose of the economize on electricity and the raising accuracy of measuring.

The utility model is achieved in that the high accuracy common current instrument transformer of being made up of iron core, winding, a secondary winding, and its secondary winding is on the coil rack of two ends non-flanged baffle plate.The edge plate washer that removes the coil rack two ends is in order to increase winding length to greatest extent, thereby increases the magnetic flux density of secondary winding.The screw hole of secured core silver is moved to the edge of rectangle iron core by the magnetic circuit center, and half hole is only arranged on iron core,, reduce the eddy current loss of iron core to improve magnetic state.Iron core uses the cold-rolled orientation silicon steel sheet, cuts into small strip piece, eliminates stress through annealing in process, and increases the length of winding arm iron core silver as far as possible.

Take the latter made current transformer of above-mentioned measure, precision reaches 0.1 and 0.2 grade, assembly space is not more than former 0.5 grade of current transformer, has therefore satisfied on existing power distribution cabinet, distribution box and has replaced 0.5 grade of current transformer, the needs of 1.0 grades of electric energy meters of adapted with 0.1 or 0.2 grade of current transformer.0.1 or 0.2 grade of current transformer provided by the utility model, price and former 0.5 grade of current transformer are basic identical, and have reduced material usage, and saves energy has obvious social and economic benefit.

Be an embodiment of the present utility model below, the description of this embodiment and accompanying drawing have provided details of the present utility model.

Fig. 1 is that current transformer is used for 1.0 grades of electric energy meter line maps.

(1) expression 220V AC power among the figure, (2) D.C mutual-inductor, (3) are electric energy meters.

Fig. 2 is the line map of current transformer when being used for ammeter.

(4) are ammeters among the figure.

Fig. 3 is the mutual device structural representation of high accuracy common current.

Among the figure (5): the secondary winding lead-in wire; (6): secondary winding; (7): iron core; (8): trip bolt is used half hole; (9): a winding; (10): a winding lead-out wire; (11): the winding coil skeleton.

(5) are the lead-ins of secondary winding among the figure, link with electric energy meter or ammeter.(6) be secondary winding, separated into two parts, at an arm and an arm relative with it of winding once, total number of turns is 119 circles respectively, and its load is 10VA, and the winding total length is 112-130mm, and its number of turn and winding length are than being 1.063-0.92 circle/millimeter.(7) be to cut into after the silver with the cold-rolled orientation silicon steel sheet, the iron core that is formed by stacking, core section is long-pending to be 4.3--5.9cm ²(8) be that trip bolt is used half hole, one has four, and its position as shown in the figure.(9) be a winding, be connected on the power line by a winding leads (10).One time winding can reach 300A by electric current, uses the surface that the flat copper coiling of insulating barrier is arranged.(11) be the winding coil skeleton.Under the condition of fixing at core length, increase winding length as far as possible, use two ends not have the bobbin of plate washer, the end winding conducting wire uses cotton thread to fix.

The high accuracy common current instrument transformer of Zhi Zuoing according to the method described above, under the condition that does not increase original 0.5 grade of current transformer installation site and bulk, precision rises to 0.1 or 0.2 grade, and, price is suitable with former 0.5 grade of current transformer, can satisfy the requirement that users use 1.0 grades of electric energy meters.

Claims (3)

1, a kind of high accuracy common current instrument transformer is made up of iron core, winding, a secondary winding, it is characterized in that the coil rack two ends non-flanged plate washer of secondary winding.

2, high accuracy common current instrument transformer according to claim 1, the number of turn that it is characterized in that secondary winding is 1.063-0.92 circle/millimeter with the ratio of winding length.

3, high accuracy common current instrument transformer according to claim 1, the screw hole that it is characterized in that fastening iron core silver only has half hole at the iron core edge on iron core.

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