Buy DIN EN () Electricity Metering Equipment (a.c.) – Part 1: General Requirements, Tests And Test Conditions – Metering Equipment (class. BS EN Electricity metering equipment (a.c.). General requirements, tests and test conditions. Metering equipment (class indexes. Find the most up-to-date version of CEI EN at Engineering
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NOTE 2 Values higher than 4 h should be subject of purchase dn. Dr The operation indicator, if fitted, shall be visible from the front. When the voltage is restored, the meter shall not have suffered degradation of its metrological characteristics.
Dr — — — — where x is the critical change value specified in 7. The preferred pairs of upper and lower temperature limits are shown in Table 8. NOTE The type is represented by the sample meter s intended for the type tests, whose characteristics reference current and reference voltage are chosen from the values given in the tables proposed by the manufacturer.
During the test, the duration of which shall be 2 h, the meter shall be exposed neither to draught nor to direct solar radiation. NOTE Meters are generally used in locations where levels of vibration and shock are of low significance. If contact discharge is not applicable because no metallic parts are outside, then apply air discharge with a 15 kV test voltage. The auxiliary circuits intended to be connected either directly to the mains or to the same voltage transformers as the meter circuits, and with a reference voltage over 40 V, shall be subjected to the impulse voltage test in the same conditions as those already given for voltage circuits.
The protective earth terminal, if any: Metering equipment class indexes A, B and C Status: During the test of a current circuit, the terminals of the other circuits shall be connected to earth and the impulse voltage shall be applied between one of the terminals of the current circuit and earth. The type may have several values of reference current and reference voltage. An optimum pulse transmission 6 is achieved when, under test conditions, the 50470-11 head is aligned with its optical axis on the optical pulse output.
Longer retention time of the non-volatile memory should be the subject of purchase contract.
It does not apply to: Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned. The clearance between the terminal cover, if made of metal, and the upper surface of the screws when screwed down to the maximum applicable conductor fitted shall be not less than the relevant values indicated in Table 4 and Table 5.
Pulse output devices for electromechanical and electronic meters two wires only IEC For polyphase meters, this diagram shall also show the phase sequence for which the meter is intended. At and above Imin, up to Itr relaxed accuracy requirements apply 3.
EN – Electricity metering equipment (a.c.) — Part 1: General req –
When continuously rotating, the drum showing the lowest values shall be graduated and numbered in ten divisions, each division being subdivided into ten parts, or any other arrangement ensuring the same reading accuracy. During the test, the behaviour of the equipment shall not be perturbed 5470-1 the additional percentage error shall not exceed the critical change values specified in the relevant standards.
The other end of the voltage circuit shall be connected to earth and the impulse voltage 5470-1 be applied between the terminal of the current circuit and earth. BS EN Draft. Electromechanical meters for active energy class indexes A and B.
Meters are designated by the manufacturer by one or more groups of letters 504770-1 numbers, or a combination of letters and numbers. Dr The type test defined in 3. The tests shall be carried out according to ENunder the following conditions: General definitions and test requirements IEC The minimum time between the impulses shall be 3 s.
General terms relating to electrical measurements — Part These windows shall be of transparent material, dn cannot be removed undamaged without breaking the seal s. Some of the tests are not applicable to electromechanical meters — see EN — these cases are indicated.
It can be either electromechanical or electronic comprising both memory ies and display. Dr The terminal block shall be so constructed that the meter during any deformation caused by rated operating conditions shall comply with the insulation requirements and the clearance and creepage distances within this standard.
Dr aft for vo 3. NOTE 3 The ratio of the highest to the lowest reference speed of the rotors of each enn the meters of the same type shall not exceed 1,5. NOTE 5470-1 Where the number of ampere-turns would lead to a number of turns other than a whole number, the product of the number eh turns of the windings by the value of the reference current may differ from that of the sample meter s representative of the type.
Stationary use at weatherprotected locations IEC