Current Differential Relay Manual
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Transcript of Current Differential Relay Manual
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Product Specification
03250
ESDR 4T Current
Differential Relay
APPLICATIONS
The ESDR 4T unit offers three-phase current differential protection for generators, motors and transformers in unit connection.
Current transformers at both sides of the protection object(s) measure the individual conductor currents.
Any two-phases of three-phase short circuits and ground leakages are recognized by the ESDR 4T as fault currents.
The ESDR 4T affords design simplification of the switchgear cabinet, facilitates the commissioning, ensures the operation of the system is user friendly and increases the availability of the system.
DESCRIPTION
ESDR 4T functions & features include: • 6 x I measurement, 3-phase
system at both sides of the protected zone
• Microprocessor based design • Transformer ratio of the measuring
CT for every primary value separately adjustable
• Adjustable transformer ratio of the transformer
• Minimal command time: 40 ms • Selectable transformer vector
group • 4 programmable relays outputs • 4 metallically separated discrete
inputs for blocking and remote acknowledgement
• An internal test routine monitors cyclically the readiness for operation
• 5 mm LCD display (green illuminated)
ESDR 4T
Protective Functions ANSI #
• Generator current differential 87G
• Block current differential 87GT
• Motor current differential 87M
• Restraint current protection
• 10 bit measuring
• 3-phase Current differential protection
• Configurable transformer ratio for transformer
• Configurable CT ratio for measuring transformer
• Selectable vector group for transformer phase shift
• Digital input for blocking or remote acknowledgement
• Discrete Out permissive
• PC configurable and Front panel configurable
• Microprocessor technology for accurate, repeatable and reliable operation
• Programmable relay outputs
Example: Generator / transformer Block protection
GCB
G
ESDR 4 Block Protection
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PART NUMBERS AND OPTION PACKAGES
ESDR 4T 5448-897
TRIPPING CHARACTERISTIC
Monitoring step 1(X12 = 100 % / Y1 = 10 %)
Monitoring step 2(X12 = 100 % / Y2 = 35 %)
Protectedobject
100 200
Characteristic gradient = 10 %
Monitoring step 2, fixed limit (100 %)
X12, Y2 and Y1: adjustable
NI
100
P (X12/Y2)
P (X12/Y1)
Y =Id [%]
aI
300 400
2000-12-08ESDR 4T Auslösekennlinie e4tleo-5000-kenn.skf
500
S
I[%]I
N
X =
-+ Iba
IbI =
IS II=I bad2
Monitoring step 1fixed limit(85 %-Y2+Y1)
Monitoring step 2fixed limit (85 %)
1
21 2=
35
10
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DIMENSIONS
27
1
34
35
36
63
28
29
30
31
32
33
42
50
65.0
55.8
ø4.0
4.6
46.5
ø4.0
14
3.
0
50.0
Leonhard - ReglerbauStuttgart
24
variable release characteristic
Section A
operation and error messages
I
25
26
37
38
39
40
41
Y
N
d
I
X
10 %release
lock
Id
ISL1
bad
ø4.0
IN
IS
error
ONmonitoring
select digit
message display
ø4.0
cursor
clear
differential currentprotection
protectedobject
I=I
L2
Ia=IS
Ia
[ ]L3ESDR 4
I-
+2
bI
bI
180.0
132.0A
8.0
14
4.
0
110.045.0
16.5
A Mounting clamp
Snapp track mounting
72.0
SPECIFICATIONS
Measuring current .............................. /1 A or../5 A Measuring frequency.............................. 40–70 Hz Power supply................................. 24 Vdc (±25 %) Power consumption ............................... max. 6 W Ambient temperature ............................ -20–70 °C Ambient humidity................. 95%, non-condensing
Measuring input current.. consumption < 0.15 VA Current-carrying capacity...................... 5.0 × IN
Rated short-time current (1 s)100.0 × IN (for 1 s) ........................................ 30.0 × IN (for 10 s) Accuracy ............................... maximal 1 % × IN Reference voltage............................... ±0.15 % Max. temperature deviation .............. 12 ppm/K
Digital inputs ..................... metallically separated Insulation voltage ............................... 2200 Veff Input range........................ 18–250 V (dc or ac) Input resistance....................................... 68 kΩ
Potential free outputs .... contact material: AgCdO Electrical life cycle (ohmic load) .................................................. min. 100.000 cycles at 2 A / 250 Vac
Load................. max. 2 A at 250 Vac or 24 Vdc Max. switching voltage ........................ 250 Vac
Insulation voltage..................................... 2200 Veff Switching capacity DC .................................. 45 W
Protection functions............................................................................ minimum command time 40 ms
Housing ................ type APRANORM DIN 43 700 Dimensions (snap-on rail) . 144 × 72 × 199 mm Dimensions (front) ............ 144 × 72 × 162 mm Front cutout ................................. 138 × 67 mm Connection ............ screw terminals depending ......... on plug connector 2,5 mm² or 4 mm²
Front foil .................................... insulated surface
Protection system .................... IP 21, front IP 54 Weight .. depending on model, approx. 1,000 g
Disturbance test ......................................... (CE)........ tested according to applicable EN guidelines
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Woodward Industrial Controls PO Box 1519 Fort Collins CO, USA
80522-1519 1000 East Drake Road Fort Collins CO 80525 Ph: +1 (970) 482-5811 Fax: +1 (970) 498-3058 Distributors & Service Woodward has an international network of distributors and service facilities. For your nearest representative, call the Fort Collins plant or see the Worldwide Directory on our website. Corporate Headquarters Rockford IL, USA Ph: +1 (815) 877-7441 www.woodward.com This document is distributed for informational purposes only. It is not to be construed as creating or becoming part of any Woodward Governor Company contractual or warranty obligation unless expressly stated in a written sales contract. © Woodward Governor Company, 2001 All Rights Reserved
TYPICAL APPLICATIONS
off52
ESDR 4T
G
I / O
87GT
87G
ESDR 4T
For more information contact: 01/08/F