Voltage transformers antiresonant gas-insulated ЗНГ-UEТМ®-220
Voltage transformers antiresonant gas-insulated ZNG-UETM® are designed to transmit the measurement information signal to measuring devices and protection and control devices.
- Voltage transformers inductive grounded antiresonance gas-insulated series ZNG-UETM® are designed to work in electric networks of 50 Hz and 60 Hz with an efficiently grounded neutral on open and closed distribution devices
- The upper working value of the ambient temperature is +50оС
- The lower operating ambient temperature is -60оС
- Each transformer is equipped with an effective explosion-proof device (membrane), which excludes the explosion of a transformer even with a short internal circuit
- A high class of accuracy of a secondary winding for the account - 0,2
- Low level of leakage of insulating gas - no more than 0.2% of the total mass per year, as well as the use of reliable components ensure operation without maintenance, with an average service life of 40 years
- Possibility of manufacturing a transformer with three secondary windings: one for connecting metering circuits, the second for connecting measurement, protection and control circuits, and the third for earth fault protection circuits
- Lack of internal solid insulation eliminates the occurrence of partial discharges, allows you to not conduct periodic inspections and tests of insulation for a long time
- The ability to seal the findings of the secondary winding for electricity metering prevents unauthorized access to the metering circuits
Parameters
General specifications
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№
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Parameters
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ZNG-UETM®-220
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1
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Rated primary voltage, kV
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220/ √ 3
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2
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Rated voltage of the main secondary windings, V
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100/ √ 3
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3
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Rated voltage of additional secondary winding, V
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100
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4
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Number and purpose of secondary windings, pcs.:
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Primary for measuring and powering electricity metering circuits, terminals a1 – x1 (hereinafter - winding U)
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1
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Primary for measurement and protection, terminals a2 – x2 (hereinafter - winding I)
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1
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Additional for protection against earth faults, ad-xd conclusions
(further - winding D)
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1
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5
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Rated power of the secondary windings at a power factor of 0.8, VA:
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Winding U
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Up to 1000 1)
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Winding I
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|
Winding D
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Up to 500 1)
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6
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Accuracy classes of secondary windings depending on the load:
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Winding U
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0,2; 0,5; 1; 3 1)
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Winding I
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Winding D
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3Р; 6P 1)
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7
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Maximum power transformer, VA
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Up to 2500
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8
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No-load current at power supply from winding side D, A, not more
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8
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9
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Insulation resistance, MOhm, not less:
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Primary winding
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300
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Secondary winding
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50
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10
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Voltage coefficient according to GOST 1983 ( 6.6.)
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1,5 during 30 s
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11
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Climatic modification in accordance with GOST 15150
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Т1, U1, HL1*
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12
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Main insulation for climatic versions T1, U1 SF6 gas (SF6) with parameters:
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Nominal filling pressure reduced to 20 ° C, MPa, abs
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0,5
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Warning pressure2) reduced to 20 ° C, MPa, abs.
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0,44
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Alarm pressure2) reduced to 20 ° C, MPa, abs.
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0,42
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13
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Main insulation for climatic version HL1 * SF6 gas mixture with freon-14 (CF4) or nitrogen with gas parameters:
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Nominal filling pressure reduced to 20 ° C, MPa, abs.
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0,7
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Warning pressure1) reduced to 20 ° C, MPa, abs.
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0,62
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Alarm pressure1) reduced to 20 ° C, MPa, abs.
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0,6
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14
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Ambient air temperature for execution T1:
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Minimum, °С
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-10
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Maximum, °С
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+50
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15
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Ambient temperature for the performance of U1:
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Minimum, °С
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-45
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Maximum, °С
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+40
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16
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Ambient temperature for performance HL1*:
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Minimum, °С
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-55
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Maximum, °С
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+40
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17
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Weight of gas, kg:
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SF6 gas for U1
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16,0
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SF6 gas for HL1*
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11,0
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Freon for version HL1*
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6,6
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18
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Gas consumption for leaks per year,% by weight of gas, not more than 0.5
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0,5
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1) The actual values of loads and winding accuracy classes are specified in the passport of the transformer
(according to customer requirements).
2) The pressure of the alarm and warning alarms are pressures that, when lowered to which the contacts in the warning and alarm circuits are activated, respectively.
- Warranty period - 5 years.
- Average transformer life is 40 years.
- Intertesting interval - 10 years.
Loads and accuracy classes for secondary co-operation
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Winding conditions
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Load, VА
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Winding U in the appropriate class of accuracy at loading of a winding I to 10001) VA
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Up to 10001)
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Winding I in the appropriate accuracy class with a winding load U up to 10001) VA
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Up to 10001)
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