LRGBJ Series: 40.5~550kV
Current Transformers Safe, Reliable High-Voltage Current Transformers That Never Need Maintenance Current transformers are used in electrical grids for measurement and protective applications to provide signals to equipment such as meters and protective relays by stepping down the current of that system to measurable values. Their role in electrical systems is of primary importance because the data sent by current transformers represent the heartbeat of the entire system. RHM International’s proprietary dry type Current Transformers are unique as they provide a rugged, reliable option for high voltage metering and protection operations up to 550 kV. Our high quality Current Transformers are based on a unique U-shaped bushing design for the primary winding. The bushing is a very fine capacitance graded insulator. In a new approach to dry designs, our advanced proprietary HV DryShieldTM composite insulation system uses reliable materials like PTFE (Polytetrafluoroethylene) and silicon rubber to provide a low stress, uniform field distribution between the conductor and the outside structure.
LRGBJ—ZHD 110 kV
The primary and secondary windings are independently sealed resulting in a totally weather resistant design. Oil or gas is not required for insulation. Therefore, our environmentally friendly Current Transformers completely eliminate the risk of explosion and toxic leaks. Considering the difficulty for our customers to schedule circuit outages for routine upgrades and maintenance, the high cost of maintenance, and environmental issues, RHM International’s Current Transformers provide exceptionally low cost of ownership and offer you peace of mind as they are truly maintenance free. Customer benefits: Dielectric Dissipation Factor (Tan δ)
LRGBJ—110 kV
• Totally safe – no risk of explosion • Totally maintenance free – exceptional low cost of ownership
Flashover Risk
Manufacture Time
• Environmentally friendly – no risk of toxic leak and recyclable insulation materials • 2 to 3 times lighter than conventional oil or gas based products
Partial Discharge
Maintenance Required
Actual Failure Rate Oil SF6 RHM
Component Weight
Comparison of conventional current transformer technologies with RHM International’s
• Mature and Innovative with unmatched quality records – not a single failure in 20 000 HV DryShieldTM equipped products in the field • A new approach to dry design without the limitations of conventional dry Current Transformers • All products are developed and manufactured in an ISO 9001 certified plant and compliant to IEC and IEEE international standards. A TR Electric Par tner t ner RHM International LLC 81 Glen Road, Brookline, MA 02445 USA Tel/Fax: +1 617 608 0274
[email protected] www.rhmintl.com
Main Characteristics 1.Performance Highest voltage for equipment: 40.5-550 kV
Rated frequency: 50, 60 Hz
Rated primary current:
5-5000 A (up to 8000 A under specific conditions – please contact us)
Rated secondary current:
5 A, 1 A
Rated output:
10-50 VA
Accuracy class for measuring current transformer: Instrument security factor:
0.2S, 0.2, 0.5S and 0.5 class
5, 10
Accuracy class for protective current transformer:
5P, 10P and TPY (TPS, TPX and TPZ on demand)
e e r f e c n a n e t n i a M
Accuracy limit factor for protective current transformer: 5,10, 15, 20, 30, 40 Secondary cores:
1-8
All products comply with IEC-44-1-1996 ”Current Transformers” and IEEE C57.13 standards Protective class current transformers comply with IEC-44-6: 1992 “Requirements for Protective Current Transformers for Transient Performance” 2. Environmental Condition Places of operation:
Indoors and outdoors
Environmental temperature:
-45°c [-49F] / +45°c [113F]
Altitude:
<1000m above sea level (when higher than 1000m, specific design available. Please contact us)
Pollution level:
fully compliant to Class IV environments (IEC category – very heavy pollution level)
3. Type tests and special tests include: • Measurement of capacitance and Dielectric Dissipation under Um/ √ 3 and 10kV, the Dielectric dissipation factor (tanδ) is less than 0.004
Highest voltage for equipment Um kV (r.m.s.)
Rated power Rated frequency switching withstand impulse voltage withstand 1 min50/60 Hz. voltage kV kV (r.m.s.) (peak)
Rated lightning impulse withstand voltage kV (peak)
Rated chopped lightening impulse withstand voltage kV
Partial discharge pC
< =5 < =5
• Short-time current tests: Thermal short-time current (Ith):
50 kA, 3s
40.5
95*
-
185
-
Rated dynamic current (Idyn):
125 kA (peak value)
72.5
140*
-
325
-
75 K
126
230*
-
550
632
252
460*
-
1050
1207
< =5 < =5
550
680
1175*
1550
1783
< = 10
• Temperature-rise test: • Mechanical tests (see table 2) • Determination of errors
• Insulation and thermal stability test (36h according to standard but tested 72h for 550kV)
* a wet test is added for outdoor use
4. Routine tests: Before leaving the factory the following routine tests are carried out: on primary winding: • Power-frequency withstand test • Power-frequency withstand test between sections of primary • Partial discharge measurement • Capacitance and dielectric dissipation factor measurement • Verification of terminal markings 5.Maintenance: Maintenance is not needed
on secondary windings: • Power-frequency withstand test • Power-frequency withstand test between sections of secondary windings • Inter-turn over-voltage test • Determination of errors
Highest voltage Um (kV) 5.72.5 126 252 550 Table 2
Static forces (N) 1250 2000 4000 4000
Standard LRGBJ CTs Highest voltage for equipment (kV)
Model & Specification LRGBJ - 40.5 / 600 LRGBJ - 40.5 / 1000 LRGBJ - 40.5 / 1200 LRGBJ - 40.5 / 1600 LRGBJ - 40.5 / 2500 LRGBJ - 72.5 / 600 LRGBJ - 72.5 / 1000 LRGBJ - 72.5 / 1200 LRGBJ - 126 / 600 LRGBJ - 126 / 1000 LRGBJ - 126 / 1200 LRGBJ - 126 / 1600 LRGBJ - 126 / 2500 LRGBJ - 252 / 600 LRGBJ - 252 / 1000 LRGBJ - 252 / 1200 LRGBJ - 252 / 1600 LRGBJ - 252 / 2500 LRGBJ - 550 / 2500 TPY
40.5 40.5 40.5 40.5 40.5 72.5 72.5 72.5 126 126 126 126 126 252 252 252 252 252 550
Rated current (A) 100~600 800~ 1000 1200 1600 2000~2500 100~600 800~ 1000 1200 100~600 800~ 1000 1200 1600 2000~2500 100~600 800~ 1000 1200 1600 2000~2500 2500
Creepage distance (mm)
Dimensions (mm) L 1015 1015 1015 1030 1060 1550 1550 1550 1785 1785 1785 1800 1830 2670 2670 2670 2710 2740 5900
L1 80 80 80 100 120 80 80 80 80 80 80 100 120 80 80 80 100 120
L2 20 20 20 25 30 20 20 20 20 20 20 25 30 20 20 20 25 30
L3 40 40 40 50 60 40 40 40 40 40 40 50 60 40 40 40 50 60 see figure
L4 400 400 400 400 400 580 580 580 580 580 580 580 580 860 860 860 860 860
L5 360 360 360 360 360 200 200 200 200 200 200 200 200 350 350 350 350 350
L6 350 350 350 350 551 551 551 551 551 551 551 551 551 715 715 715 715 715 1260
L7 320 320 320 320 320 400 400 400 400 400 400 400 400 500 500 500 500 500 700
a b 15 14 15 14 15 14 15 14 15 18 15 14 15 14 15 14 15 14 15 14 15 14 15 14 19 18 19 14 19 14 19 14 19 14 19 18 see figure
t 12 12 14 14 14 12 12 14 12 12 14 14 14 12 12 14 14 14
1015 1015 1015 1015 1015 1925 1925 1925 3200 3200 3200 3200 3200 6300 6300 6300 6300 6300 13750
90/198 90/198 90/198 90/198 90/198 200/441 200/441 200/441 240/529 240/529 240/529 240/529 240/529 440/970 440/970 440/970 440/970 440/970 3000/6614
All dimensions are indicative of typical designs - actual dimensions are confirmed with orders. Special sizes available upon request.
LRGBJ CT
LRGBJ 550/2500 TPY L7
A
L7 5 2 5 d 2 0
0 4 0 2
40 125
0 3 / + L
5 . 6-ø14 2 2
5 1 ± 0 0 9 5
0 1 / + 6 L
L4
L5 4-øa
L1 L2 L3 +/- 0.5 t
4-ø50
0 6 2 1
5 . 0 1 / L + 3 L
4-øb
740 1100 1250 1520
8-ø26 700 820 855
Weight (kg/lb)
High Current CT Model & Specification
Highest voltage for equipment (kV)
Rated current (A)
LRGBJ - ZHD - 72.5 / 4000 LRGBJ - ZHD - 72.5 / 6000 LRGBJ - ZHD - 126 / 4000 LRGBJ - ZHD - 126 / 6000 LRGBJ - ZHD - 252 / 4000 LRGBJ - ZHD - 252 / 6000
72.5 72.5 126 126 252 252
2500 ~ 4000 5000 ~ 6000 2500 ~ 4000 5000 ~ 8000 2500 ~ 4000 5000 ~ 6000
Creepage distance (mm)
Dimensions (mm) L 1650 1650 1880 1880 2950 2950
L1 160 125 160 125 160 125
L2 80 180 80 180 80 180
L3 50 60 50 60 50 60
L4 30 32.5 30 32.5 30 32.5
L5 580 580 580 580 860 860
L6 200 200 200 200 350 350
L7 531 531 531 531 715 715
L8 400 400 400 400 500 500
a 15 15 15 15 19 19
D 18 18 18 18 18 18
1925 1925 3200 3200 6300 6300
Weight (kg/lb)
250/551 250/551 290/639 290/639 490/1080 490/1080
All dimensions are indicative of typical designs - actual dimensions are confirmed with orders. Special sizes available upon request.
High Current LRGBJ ZHD Inquiry check list
When placing an order, customer’s specification needs to include: • Highest voltage Um • Rated current • Rated frequency • Rated transformation ratio • Number of secondary windings • Rated output (20~50VA) • Accuracy class: 0.2s, 0.2, 0.5s, 0.5or 5P, 10P, TPY • Accuracy limit factor (5\10\15\20\25\30) • Instrument security factor: 5,10 If users have specific requirements, custom designs can be jointly defined.
RHM International LLC 81 Glen Road Brookline, MA 02445 USA Tel/Fax: +1 617 608 0274
[email protected] www.rhmintl.com
A TR Electric Par tner
HV DryShield™ is a trademark of RHM International
