NUMERICAL TRANSFORMER DIFFERENTIAL RELAY JND 040

OVERVIEW

    Features

  • Biased current differential protection
  • Fast differential Hi-set
  • Dual slope characteristics
  • Inbuilt CT Ratio correction factor
  • Adjustable 2nd harmonic restraint
  • Adjustable 5th harmonic blocking
  • Inbuilt Vector group compensation
  • Two groups of settings
  • History of 5 latest faults

Application:

JND 040 is a two winding numerical transformer differential relay. The relay is used for protection of power transformer against hazardous internal faults.

Numerical Transformer Differential Relay
JND 040

Principle of Operation:

JND 040 provides differential protection for power transformer. The relay measures the line current of each phase from each of the windings of the transformer. Relay calculates the differential current (Id) and restraining current (Ir) per phase. The differential characteristics define the operating and the restraining regions. The shape of the characteristics defined by Initial pickup (ik), SLOPE1 (DF1), SLOPE2 (DF2) and break point (kp) are programmable. If ‘Ir’ is less than ‘kp’, then characteristics is defined by ‘DF1’ and is applicable for small differential currents. If ‘Ir’ is greater than or equal to ‘kp’, then characteristics is defined by ‘DF2’ and is applicable for large differential currents. If the operating point i.e. (Id, Ir) is within the operating region, then the relay trips. The relay provides programmable 2nd and 5th harmonic current restraint, which, exist when transformer is energized and over excitation condition exists respectively. The relay provides stability on external “line to line” and “line to ground” faults. The relay has in-built vector group compensation selection and CT ratio correction, hence the usage of external interposing CT can be avoided.

 

SPECIFICATIONS

Ratings:

Primary current rating

:

0.577A / 1A / 2.89A / 5A

Secondary current rating

:

0.577A / 1A / 2.89A / 5A

Aux. Supply

:

20 – 60V DC
75 - 150V AC /DC
175 – 300V DC or
185 – 250V AC

 

 

 

Settings:

Pickup (ik)

:

0.10 to 1.00pu in steps of 0.05pu

Slope1 (Df1)

:

10 to 100% in steps of 5%

Slope2 (Df2)

:

50 to 200% in steps of 5%

Breakpoint (kp)

:

1.0 to 10.0pu in steps of 0.1pu

Differential Hiset

:

2 to 20pu in steps of 1pu

CT Ratio W1

:

0.5 to 2.00pu in steps of 0.01pu

CT Ratio W2

:

0.5 to 2.00pu in steps of 0.01pu

Inrush (2f)

:

10 to 50% in steps of 5%

Vector Groups

:

Yy0, Dd0, Yd1, Dy1, Dd2, Dd4, Yd5, Dy5, Yy6,
Dd6, Yd7, Dy7, Dd8, Dd10, Yd11, Dy11.

 

 

 

Mechanical Design :

Weight

:

App. 5 Kgs.

Case Size

:

152X296 sq mm, depth 250mm

Installation

:

Flush mounting

Panel cutout

:

146 x 264 mm

     

Standard Compliance :

Accuracy Test

:

IEC 60255-3

Insulation Test

:

IEC 60255-5

     

Accuracy:

Voltage

:

±5%

Frequency

:

±0.02Hz

Phase Angle

:

±2%

Operating time

 

±5%

 

 

 

 

Contact Ratings:

Make & carry

:

1250VA with max. current 5A or max. Voltage 660V AC
1000W with max. current 5A or max. Voltage 250V DC

Break

:

2500 VA with max current 10A or max. Voltage 660V AC
200 W (resistive) 100 W (inductive) with max.
current 10A or max. Voltage 250V DC

     

Contact Durability :

Loaded contact

:

10,000 operations min.

Unloaded contact

:

100,000 operations min.

     

Over Load Rating:

current input

:

2 times Rated continuous
20 times Rated for 3s
40 times Rated for 1s

     

Burden:

Current input

:

0.1VA per phase (Rated 5A)
0.05VA per phase (Rated1A)

Aux. Supply

:

Less than 6W (non operated)
Less than 11W (operated)

     

Operating Time

Operating time

:

Typical 35ms

High st operating
time

:

Typical 30ms

     
 

Numerical Transformer Differential Relay
JND 040

 

DOWNLOADS

Numerical Transformer Differential Relay JND 040

Catalogues:

DOWNLOAD

Operating Manual:

DOWNLOAD

 

Numerical Transformer Differential Relay
JND 040

 

ORDERING INFO.

Ordering Information:

Relay type

:

JND 040

Primary current rating

:

0.577A / 1A / 2.89A / 5A

Secondary current rating

:

0.577A / 1A / 2.89A / 5A

Aux. Supply

:

20 – 60V DC
75 - 150V AC /DC
175 – 300V DC or
185 – 250V AC

 

 

 

 

Numerical Transformer Differential Relay
JND 040

 

A WebSpotLight creation by Netsoft.