Types N5, N5H

2
Fig. 1
Type N5,
Combined Instrument
Transformer
Introduction
Trench is a recognized world leader in the design and manufacture of high voltage equipment for application on electric utility and high energy industrial systems. As part of Trench's product scope, the Company produces a diversified range of Instrument Transformers which are installed on 69 - 800 kV electrical systems. Instrument
Transformers include: Voltage
(Potential) Transformers (both inductive and capacitive type),
Current Transformers and Combined Instrument Transformers, also referred to as metering units
(voltage and current transformer in one unit).
Combined Instrument Transformers must convert transmission class voltages and currents to standardized low and easily measurable values, which will be used for metering, protection and control of the high voltage system. As such, the need for accurate and reliable voltage and current transformation is essential.
This brochure will detail the features and characteristics of types N5 and N5H
Combined Instrument Transformers.
Please refer to Trench brochure E210 for additional general information concerning high voltage Instrument Transformers.

• meet all IEC and ANSI metering and protection classes (other standards on request)
• Hi-ACC ™,0.15% accuracy units available
• rated primary currents up to
3000 A
• applications from 35kV to
230 kV
• standard thermal burden ratings of 2500-6000 VA (higher on request)
• Trench Management System has been certified to ISO 9001,
ISO 14001 and OHSAS 18001 standards.
• highly refined and processed oil/paper insulation system
• low weight and minimum oil volume
• excellent seismic performance as a consequence of optimized design of flanges, porcelain and their interconnection
• excellent control of internal and external insulation stresses
• hermetically sealed construction using nitrile rubber gaskets
• essentially unaffected by stray external magnetic fields
• stable accuracy over a long period of time
• perfect transient performance
• suitable for line discharging
• corrosion resistant aluminum head polyester powder coated
• oil expansion compensation by dry nitrogen cushion
• two tapped secondary voltage windings on low loss, low leakage reactance, distributed gap core
• only one foundation/support structure required in the substation as a consequence of combining the voltage and current sensing functions in one transformer
Fig. 2
Sectioned view of a typical N5 Combined
Instrument Transformer
3

Catalog Numbering
System
Metering Unit Selection
4
Catalog numbers are composed of three parts as shown in the example on the right.
• The TYPE contains the transformer
SERIES designation and the BIL (kV) rating. In this example, N5-900
• The Voltage Transformer Suffix represents the nominal System
Voltage in kV. In this example, 230.
• The Current Transformer Suffix is listed in two parts, Primary
Amperes and Ratio Arrangements.
In this example, 401 S.
Series
N5 Design with current transformer in the dome, voltage
N5H transformer in tank, 0.3% accuracy class.
Same design as N5 with improved accuracy rating of
0.15% Hi-ACC TM design.
BIL (kV) Basic lighting impulse insulation level.
System Voltage Nominal system voltage kV.
Primary Amperes Indicates highest nominal primary amperage.
(Suffix No 1)
For example:
50 A = 500
200 A = 201
2000 A = 202
Ratio Arrangements S-
(For Current Transformer) P-
(Suffix No 2)
Dual ratio by secondary tap
Dual ratio by series-parallel of primary
Blank- Single ratio
M- Multi- ratio by secondary tap
N5-900 - 230 - 401 S
Type Voltage Current
Transformer Transformer
Suffix Suffix
Metering Unit Voltage Transformer Selection (60Hz)
Catalog Number
Series BIL Type
(kV) Voltage Trans. Suffix +
Current Trans. Suffix (from p.5)
Nominal
System Rated
Voltage Primary
(kV) (Volts)
Voltage Rated Accuracy Thermal
Ratio 1 Both Secondary and Burden Burden
Secondaries (Volts) 3 Rating Rating
(VA)
200
250
350
350
N5 550
650
750
900
1050
N5-200-35-(No.1) (No.2)
N5-250-46-(No.1) (No.2)
N5-350-60-(No.1) (No.2)
N5-350-69-(No.1) (No.2)
N5-550-115-(No.1) (No.2)
N5-650-138-(No.1) (No.2)
N5-750-161-(No.1) (No.2)
N5-900-230-(No.1) (No.2)
N5-1050-230-(No.1) (No.2)
34.5
46
60
69
115
138
161
230
230
20125
27600
34500
40250
69000
80500
92000
175/300:1
240/400:1
300/500:1
350/600:1
600/1000:1
115/67.08
115/69
0.3ZZ
0.3ZZ
700/1200:1 115/67.08
0.3ZZ
800/1400:1 115/65.71
0.3ZZ
138000 1200/2000:1
138000 1200/2000:1
115/67.08
115/69 0.3ZZ
115/69 0.3ZZ
2
115/69
115/69
0.3ZZ
0.3ZZ
0.3ZZ
200
250
350
350
N5H 550
650
750
900
1050
N5H-200-35-(No.1) (No.2)
N5H-250-46-(No.1) (No.2)
N5H-350-60-(No.1) (No.2)
N5H-350-69-(No.1) (No.2)
N5H-550-115-(No.1) (No.2)
N5H-650-138-(No.1) (No.2)
N5H-750-161-(No.1) (No.2)
N5H-900-230-(No.1) (No.2)
N5H-1050-230-(No.1) (No.2)
34.5
46
60
69
115
138
161
230
230
20125
27600
34500
40250
69000
80500
92000
175/300:1
240/400:1
300/500:1
350/600:1
600/1000:1
115/67.08
115/69
0.15Y
0.15Y
700/1200:1 115/67.08
0.15Y
800/1400:1 115/65.71
0.15Y
138000 1200/2000:1
138000 1200/2000:1
115/67.08
115/69
115/69
115/69
115/69
0.15Y
0.15Y
0.15Y
0.15Y
0.15Y
1 Voltage transformer element is ANSI Group 3, for connection phase-to-ground on solidly grounded "wye" systems.
2 0.6ZZ on tap of secondary and tertiary windings.
3 Refer to table on next page "Metering Unit Current Transformer Selection" for Current Transformer Suffix numbers.
4 Contact factory for CSA standard ratings and 50 Hz applications.
2500
4000
4000
4000
6000
4000
6000
6000
6000
2500
4000
4000
4000
6000
4000
6000
6000
6000

Accuracy Selection - Voltage Transformer
Series
N5
Accuracy Rating
(90% thru 110% of
Nominal Voltage) 1
0.3%
Burden
Rating 2
O,W,X,M,
Y,Z,ZZ
N5H 2 0.15% 3 O,W,X,
M,Y
1 The accuracy rating is based on the sum of the burdens on both windings not exceeding the values listed above.
2 For additional information on Hi-ACC TM High Accuracy
Transformers, consult factory.
3 The 0.15% parallelogram is constructed using the same principles as the 0.3% parallelogram in accordance with ANSI Standard
C57.13.except the maximum phase angle and ratio correction factors of the 0.15% parallelogram are half those of the
0.3% parallelogram.
Metering Unit Current Transformer Selection
Series BIL
(kV)
Type + (Suffix No. 1+ No.2)
Primary Ratio Arrangement (Suffix No.2)
Nominal Catalog S P Blank M
1
Amperes (Suffix No.1) (Dual Ratio) (Dual Ratio) (Single Ratio) (Multi-Ratio)
N5
200
250
900
1050
N5-200-35-
N5-250-46-
350 N5-350-60-
350 N5-350-69-
N5-900-230-
(No.1) (No.2)
(No.1) (No.2)
(No.1) (No.2)
(No.1) (No.2)
550 N5-550-115(No.1) (No.2)
650 N5-650-138(No.1) (No.2)
750 N5-750-161(No.1) (No.2)
(No.1) (No.2)
N5-1050-230- (No.1) (No.2)
1000
1200
1500
1600
2000
3000
50
100
150
200
300
400
600
800
500
101
151
201
301
401
601
801
25/50:5
50/100:5
75/150:5
100/200:5
150/300:5
200/400:5
300/600:5
400/800:5
102
122
152
500/1000:5
600/1200:5
750/1500:5
162 800/1600:5
202 1000/2000:5
302 1500/3000:5
-
-
-
-
-
-
-
-
-
-
-
-
-
-
200 N5H-200-35(No.1) (No.2)
250 N5H-250-46(No.1) (No.2)
350 N5H-350-60(No.1) (No.2)
350 N5H-350-69(No.1) (No.2)
N5H 550 N5H-550-115- (No.1) (No.2)
650 N5H-650-138- (No.1) (No.2)
750 N5H-750-161- (No.1) (No.2)
900 N5H-900-230- (No.1) (No.2)
1050 N5H-1050-230 -(No.1) (No.2)
100
150
200
300
400
600
800
1000
1200
1500
1600
2000
3000
101
151
201
301
401
601
801
102
122
152
162
202
302 -
-
-
-
-
-
-
-
-
-
-
-
50X100:5
75X150:5
100X200:5
150X300:5
200X400:5
300X600:5
400X800:5
500X1000:5
100:5
150:5
200:5
300:5
400:5
600:5
800:5
1000:5
600X1200:5
750X1500:5
800X1600:5
1200:5
1500:5
1600:5
1000X2000:5 2000:5
1500X3000:5 3000:5
1 Multi-ratio taps in accordance with ANSI Standard C57.13
50:5
100:5
150:5
200:5
300:5
400:5
600:5
800:5
-
-
-
600:5MR
-
-
-
-
1000:5 -
1200:5 1200:5MR
1500:5 -
1600:5 -
2000:5 2000:5MR
3000:5 3000:5MR
-
-
-
-
-
-
-
-
-
-
-
-
-
5

Accuracy Selection - Current Transformer
Series
N5
100%
0.3%
Metering Accuracy
% of Nameplate Rating
10% 5%
Not
Optional
1%
Not
0.6% specified specified
0.15% 0.15% by ANSI
0.15% by ANSI
0.3% 4)
Burden
Rating Class
BO.1-1.8
Relay Accuracy
Relay
Class
C200 3
N5H BO.1-1.8
1 For additional information on HI-ACC TM transformers consult factory.
2 The 0.15% parallelogram is constructed using the same principles as the 0.3% parallelogram in accordance with ANSI Standard C57.13, exept the maximum phase angle and ratio correction factors of the 0.15% parallelogram are half those of the 0.3% parallelogram.
3 Rating is based on highest ratio. Higher relay ratings are available.
4 Available on some ratios listed below (consult factory for details)
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Electrical Characteristics
Series
Applied Creepage Strike
BIL Withstand Distance Distance
(kV) (kV) in/mm in/mm
Ratio 1
N5
200
250
70
95
350 140
550 230
650 275
750 325
900 395
1050 460
34/864
52/1321
13/330
24/610
52/1321 24/610
101/2565 42/1067
131/3327 54/1372
169/4293 65/1651
169/4293 65/1651
214/5436 84/2134
200 70
250 95
N5H 350 140
550 230
650 275
750 325
900 395
1050 460
34/864
52/1321
52/1321
13/330
24/610
24/610
101/2565 42/1067
131/3327 54/1372
169/4293 65/1651
169/4293 65/1651
214/5436 84/2134
25/50:5
50/100:5
75/150:5
100/200:5
150/300:5
200/400:5
300/600:5
400/800:5
500/1000:5
600/1200:5
750/1500:5
800/1600:5
1000/2000:5
1500/3000:5
100:5
150:5
200:5
300:5
400:5
600:5
800:5
1000:5
1200:5
1500:5
1600:5
2000:5
3000:5
1.5
1.5
1.5
1.5
1.5
1.5
1.0
1.5
1.5
1.5
1.5
1.5
1.5
Thermal
Rating
Factor 2
Mechanical
Current
Short-Time
Thermal Current
Rating Rating at 30°C kA RMS Max. (1 sec.) kA RMS
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.0
1.5
1.5
1.5
1.5
1.5
1.5
4
8
12
15
24
30
60
60
60
120
120
120
120
120
39
52
60
90
90
90
90
90
3
6
10
13
20
26
60
60
60
120
120
120
120
8
12
15
24
30
30
50
50
50
90
90
90
90
6
10
10
20
25
25
1 Dual-Ratio High Accuracy transformers (Not Listed) are available, please consult factory.
2 Current transformers with higher rating factors are available, please consult factory.
Note: For multiple current transformer secondary windings, please consult factory.

Series BIL (kV) A B
Type
C D
Dimensions in.(mm)
1
E F G H I J
Creepage Weight Oil
K in (mm)2 lb (kg)2 gal (l)
N5-200 200 64.63
52.88
13.40
24.18
14.00
20.75
20.36
23.50
23.25
17.25
16.56
34 800 35
(1642) (1343) (340) (614) (356) (527) (517) (597) (591) (438) (421) (864) (363) (132)
N5-250 250 78.00
66.76
24.28
24.69
14.00
20.75
20.36
23.50
28.00
22.25
16.56
52 870 43
(19819 (16969 (617) (627) (356) (527) (517) (597) (711) (565) (421) (1321) (395) (163)
N5-350 350 78.00
66.76
24.28
24.69
14.00
20.75
20.36
23.50
28.00
22.25
16.56
52 870 43
(1981) (1696) (617) (627) (356) (527) (517) (597) (711) (565) (421) (1321) (395) (163)
N5-550 550 93.17
74.06
42.36
19.62
19.50
22.25
23.00
25.00
31.59
25.25
11.38
101 1420 57
(2367) (1881) (1076) (498) (495) (565) (584) (635) (802) (641) (289) (2565) (644) (216)
N5-650 650 111.11
97.00
54.38
27.88
19.50
22.25
23.00
25.00
31.25
25.25
19.00
131 1370 70
(2822) (2464) (1381) (708) (495) (565) (584) (635) (793) (641) (483) (3327) (621) (265)
N5-750 750 144.88 118.88
65.21
36.94
24.63
27.50
28.12
30.25
31.75
25.25
29.32
169 2300 114
(3680) (3020) (1657) (938) (626) (699) (714) (768) (806) (641) (745) (4293) (1043) (431)
N5-900 900 144.88 118.88
65.21
36.94
24.63
27.50
28.12
30.25
31.75
25.25
29.32
169 2300 114
(3680) (3020) (1657) (938) (626) (699) (714) (768) (806) (641) (745) (4293) (1043) (431)
N5-1050 1050 163.32 137.32
83.65
36.94
24.63
27.50
28.12
30.25
31.75
25.25
29.32
214 3000 159
(4148) (3488) (2125) (938) (626) (699) (714) (768) (806) (641) (745) (5436) (1361) (602)
1 Series N5H High Accuracy Units have same dimensions as Series N5
2 Weights and dimensions are approximations only and are not intended for construction purposes.
7

The Trench Group is your partner of choice for electrical power transmission and distribution solutions today; and for the development of your new technology solutions of tomorrow.
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200245
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Coil Products Division
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Canada M1V 4B6
Phone: 416-298-8108
Fax: 416-298-2209
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Instrument Transformer Division
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Pickering, Ontario
Canada L1W 3R8
Phone: 416-751-8570
Fax: 416-751-6952
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IT-17014 Bragno-Cairo Montenotte
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E 219.21
Subject to change without notice (08.2010)
Printed in Canada.