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EA0300 alternating-current ammeters – Megommetr Umanskij zavod, ChAO | all.biz
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EA0300 alternating-current ammeters
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EA0300 alternating-current ammeters

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Ukraine, Uman
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Technical characteristics
  • BrandМегомметр Уманский завод, ОАО
  • Country of manufactureUkraine
Description

Devices of electromagnetic system of panel board (panel) execution analog showing with fastening of a loose port on cores are intended for measurement of current intensity in alternating current circuits of a sinusoidal form of frequency from 45 Hz to 65 Hz of electric units of the enterprises and power objects.

Working position of devices vertical or horizontal. In coordination with the customer it is allowed to manufacture devices with working situation at any angle to 90º rather horizontal plane.

Accuracy rating 1, 5 or 2, 5.

Limits of the allowed main error of devices are equal ± 1, 5% for devices of accuracy rating of 1, 5 and ±2, 5% for devices of accuracy rating 2, 5 from a finite value of range of measurement.

Leading dimensions on a flange and length of a scale of devices depending on modification (execution), are specified in table 1:

Table 1.

Modification

(execution)

Leading dimensions on a flange Length of a scale, mm,

not less

EA0300 - 1 144 mm x 144 mm 150
EA0300 - 2 96 mm x 96 mm 90
EA0300 - 3 72 mm x 72 mm 60

Weight (no more): EA0300 - 1 - 0, 4 kg, EA0300 - 2 - 0, 3 kg, EA0300 - 3 - 0, 2 kg.

Overload ammeters are manufactured with coefficient of an overload 2. Limits of the allowed main error of overload ammeters are equal in overload part of a scale ± 10% of a finite value of range of measurement.

Finite value of ranges of measurement is given in table 2.

Table 2.

Finite value of range of measurement of the ampermeters which are switched on
directly with the current transformer
0, 1 AND, 0, 15 AND,
0, 3 AND, 0, 5 AND,
0, 75 AND, 1 AND,
1, 5 AND, 3 AND,
5 AND, 7, 5 AND,
10 AND, 20 AND
10 AND, 20 AND,
30 AND, 50 AND,
75 AND, 100 AND,
500 AND, 750 AND, 1000 AND, 1500 AND, 2500 AND, 5000A, 7500 AND, 10000 AND
Note 1. Depending on the order ampermeters with a finite value of range of measurement less than 1 And can be produced as milliammeters, and ampermeters with a finite value of range of measurement more than 1000 And can be produced as kiloammeters.
Note 2. The measuring current transformer should be with current of secondary winding on 1 A or 5 A.

Initial value of range of measurement does not exceed 20% of a finite value of range of measurement.

Operating conditions of application (climatic influences):

- ambient air temperature from minus 40 °C to plus 50 °C, relative air humidity to 95% at a temperature of 30 °C.

Own consumption of devices should be:

- ampermeters of direct inclusion no more than 2, 5 VA;

- the ampermeters which are switched on with the current transformer, (0, 6±0, 2) VA;

The degree of protection provided with the device body from penetration of the firm objects IP40 in accordance with GOST 14254 - 96 "The degrees of protection provided with covers (IP code)".

The design of devices provides lack of fluctuations of resonant character, defiant washout of the end of the index more than on width of the narrowest of scale marks with any frequency from 45 Hz to 65 Hz.

Limit conditions of transportation:

- ambient air temperature: from minus 50 ºС to plus 50 ºС;

- air humidity: to 98% at a temperature of 35 ºС;

- shock resistance: influence of blows with the maximum acceleration of 50 m/s2, with a frequency from 10 to 50 beats per minute;

- shock resistance in the shipping container: influence of blows with the maximum acceleration of 30 m/s2, with a frequency from 80 to 120 beats per minute;

- vibration strength: impact of vibration with a frequency of 50 Hz with the maximum acceleration of 15 m/s2.

Isolation between an electric chain and available contacts with a hand to surfaces of the body of the device maintains action of test voltage of alternating current with a frequency of 50 Hz of equal 4 kV within one minute.
Insulation resistance between the body and an electric chain of the device not less than 40 megohms in reference conditions of application.

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EA0300 alternating-current ammeters
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