Microcontroller differential transformer protection MK-DZT-3

Microcontroller differential transformer protection MK-DZT-3
  • Frequency
    50 Hz
  • Communication interface
    RS-485 Р1, Р2
  • Communication protocol
    ModBus RTU
  • The number of inputs
    9/5
MK-DZT-3 microcontroller differential transformer protection is designed for protection of two- and three-winding power transformers and autotransformers with HV-side voltage of 35 kV from phase faults and interturn short circuits.
Specifications
ParameterValue
Parameters of the protected object and protection
Number of windings of the protected transformer with current sensors
— TT
— PR

3
3
Rated sensor current voltage kV, kW
— TT
— PR

0,4 - 35
0,4 - 6
Minimum operating current protection without tap changer or tap position tracking0,1 Ibase*
Analog inputs
Rated frequency of AC, Hz50
Operative range of AC frequency, Hz45 - 55
Number of current inputs9
Circuit of the phase currents on the HV sideIа1, Iв1, Iс1
Circuit of the phase currents on the LV sideIа2, Iв2, Iс2
Circuit of the phase currents on the MV sideIа3, Iв3, Iс3
Rated protection circuits AC current, A1; 5
Measurement range of currents in the phases, secondary values, A0,25 - 100
Relative error of measurement of currents in phases, %
— from 1 up to 200 А
— from 200 up to 500А

±2
±5
Digital inputs
The number of inputs5
Rated input voltage, V110 - 220
Digital outputs
The number of outputs5
К1-К2switching contacts
К3-К5normally open contacts
Communication interfaces
RS-485 P1
RS-485 P2 (display unit interface)
Communication protocolModBus RTU
Data exchange speed, baud4800, 9600, 19200, 38400
Number of connected devices, max32
The maximum allowed length of the CAN line, m1500
Power
Rated alternating/direct control current voltage, V220
Operative voltage range of alternating control current, V85 - 265
Control current circuit power usage during downtime/MK-DZT-3 protection block activation, W, max5/7
Control current circuit power usage BI-1, W, max2
The overall dimensions and weight of the device
The overall dimensions, mm
— MK-DZT-3
— BI-1

338x185x114,5
234x146x50
Weight, kg, max
— MK-DZT-3
— BI-1

3
1
*Ibase — base protection current, defined as maximum rated current of the protected transformer.
Photo

Appointment

MK-DZT-3 implements the functions of protection and automation, control over switching devices, measuring and signaling:

  • 2 degrees of differential protection — differential overcurrent and the sensitive biased differential protection;
  • overcurrent protection;
  • disconnecting from external protection;
  • CBFP;
  • “OFF” command to the circuit breaker;
  • emergency and warning alarm.

Advantages

Using the analog-to-digital and microprocessor element base provides high accuracy and consistency of performance.
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MKZZP-6-35-I (K) microcontroller ground fault protection device for 6-35 kV bus sections is designed to selectively disable connections in case of ground fault in networks with voltage of 6-35 kV (or show a number of a damaged connection without disabling) working with insulated neutral.
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MKZZP-6-35-I (K) microcontroller ground fault protection device for 6-35 kV bus sections is designed to selectively disable connections in case of ground fault in networks with voltage of 6-35 kV (or show a number of a damaged connection without disabling) working with insulated neutral.
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MK-DZT-3 microcontroller differential transformer protection is designed for protection of two- and three-winding power transformers and autotransformers with HV-side voltage of 35 kV from phase faults and interturn short circuits.
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MK-DZT-3 microcontroller differential transformer protection is designed for protection of two- and three-winding power transformers and autotransformers with HV-side voltage of 35 kV from phase faults and interturn short circuits.
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Microcontroller protection