〈Case Study〉

Malaysia Line Power Supply System

Malaysia, , LRT, Neutral grounding system

Kazuki Hirahara

Abstract In Kuala Lumpur, Malaysia, there are two lines of Transit (LRT) lines: one KL and another line for city area rail transit. The LRT , included in the above lines, started operation in 1998 and is 29.4km in length connecting Gombak in the north side of the city of Kuala Lumpur to Kelana Jaya in the city of using a driverless train. On the Kelana Jaya Line, a recent upgrade project has been completed for the train from two cars to four cars, and for the four-car train, the power supply system was also upgraded, including a capacity upgrade for nine existing substations and the construction of two new substations with two 3000kW rectifiers.

1. Preface shows this 33kV network. The Kelana Jaya Line in Malaysia has a total At each of the 15 TPSSs, 33kV power is converted length of 29.4km and 15 Traction Power Substations into 750V DC and fed to the power rails of the positive (TPSSs). In this upgrade project for the Kelana Jaya third and negative fourth rails. Line, we supplied, installed, and tested power supply equipment for a capacity increase for the nine existing 3. Configuration of TPSSs TPSSs and two totally new TPSSs. Fig. 2 shows the new TPSS, Abudulah Hukum, and the equipment in this TPSS are stated as follows: 2. Power Supply System Configuration 3.1 Power Receiving On the system for the Kelana Jaya Line, 132kV TPSS receives 33kV AC power from BSS through power from the electric company is received at two the cable line which leads along whole the Kelana Jaya Bulk Supply Substations (BSSs) and then it is stepped Line. AC 36kV air insulated switchgear is applied for down to 33kV and distributed to each TPSSs. Fig. 1 this 33kV power receiving. The outline of this switch-

FROM 132/33kV TRANSFORMER FROM 132/33kV TRANSFORMER

KERINCHI BSS JELATEK BSS

FROM TNB TO Taman Bahagia TO Asia Jaya TO Taman Paramount TO Universiti TO TO KL Sentral TO Masjid Jamek TO KG Barus TO KLCC TO TO Damai TO Datuk Keramat TO TO

SUBANG KELANA ASIA JAYA TAMAN ABDULAH KLCC TAMAN TERMINAL DEPOT JAYA JAYA UNIVERSITI HUKUM BRICKFIELD PASAR SENI DANWANGI DAMAI SETIAWANGSA SRI RAMPAI TPSS TPSS TPSS TPSS TPS TPSS TPSS TPSS TPSS MELATI PUTRA TPSS TPSS TPSS TPSS TPSS TPSS

Fig. 1 Kelana Jaya Line 33kV Network 33kV network of all through line including all substations for the Kelana Jaya Line.

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FROM KERINCHI BSS

33k/110V Ne 100VA CL0.5 3PMCCB 3PMCCB 5A 5A VTT VS 3 V Fx3 3PMCCB 0-40kV V 3.15A 5A 27 I 3PMCCB CTx3 5A CTT AS /5A 87 A I A 7.5kA 4 87N 5P20 VCB 36kV 1250A 25kA

VCB VCB VCB 36kV 36kV 36kV 1250A 1250A 1250A 25kA 25kA 25kA CTx3 CTx3 CTx3 /5A /5A /5A CTT AS CTT AS CTT AS 7.5kA 51 A 7.5kA 51 A 7.5kA 51 A 5P20 I A 5P20 I A 5P20 I A 4 51N 4 51N 4 51N

Ne Ne Ne

(RT1) (RT2) RECTIFIER TRANSFORMER RECTIFIER TRANSFORMER AUX. TRANSFORMER 3300kVA 3300kVA 49 PV: 33kV 49 PV: 33kV 63 SV: 589V 63 SV: 589V TV: 589V TV: 589V ＊A ＊B 4x1C 400sqmm/phase 4x1C 400sqmm/phase 〈P1〉 aveV 〈P9〉 aveV AARU I SCADA AARU I SCADA 4-20mA 4-20mA RECTIFIEER 49 RECTIFIEER 49 A aveA SCADA A aveA SCADA 3000kW 3000kW I I I I 64 64 －10-0-10mA 4-20mA －10-0-10mA 4-20mA 750V DC 750V DC DCLA DCLA SH 32 SH 32 4-20mA 4-20mA 4-20mA 4-20mA 6000A 6000A 7x1C 500sqmm 7x1C 500sqmm A V A V ＊C ＊C I I I I ＊B ＊E ＊D ＊D SCADA SCADA SCADA SCADA 7x1C 500sqmm 7x1C 500sqmm (89P2) F (89P1) F DS 2A DS 2A F 〈N9〉 F 〈N1〉 750V ＊1 750V ＊1 M 6000A M 6000A 2A (189N1) 2A DS M DS M V A V A 750V 750V 0-1000V 0-6000A 0-1000V 0-6000A 6000A 6000A 〈P2〉 〈P3〉 〈P4〉 〈P5〉 〈P6〉 〈P7〉 〈P8〉 〈N8〉 〈N7〉 〈N6〉 〈N5〉 〈N4〉 〈N3〉 〈N2〉 DC 750V 6000A POSITIVE BUS DC 750V 6000A NEGATIVE BUS F F F F (172F1) (172F2) （172T） (172F3) (172F4) (72F4) (72F3) (72A) (72C) (72T) (72F2) (72F1) HSCB HSCB HSCB HSCB (172C) (172A) HSCB HSCB 16A HSCB 16A HSCB HSCB HSCB 16A HSCB 16A HSCB 750V 750V 750V 750V 750V 750V 750V 4000A 750V 750V 750V 750V 6000A HSCB HSCB MC MC 750V 6000A MC MC 4000A 4000A 750V 750V 4000A 4000A 50A 4000A 50A 4000A AARU 4000A 50A 4000A 50A 4000A 176 176 176 176 4000A 176 4000A 176 176 76 76 76 A 76 76 76 LMR LMR I 76 LMR LMR －10-0-10mA MC MC MC MC ( ) ( ) ( ) ( ) 50A 50F 50A 50F 50F 50F 50A 50F 50A 50F DCLA N DCLA N DCLA N DCLA N 900V 900V 900V 900V SH 4-20mA SH 4-20mA SH 4-20mA SH 4-20mA SH 4-20mA SH 4-20mA 10kA 10kA F F F F 10kA F 10kA 4000A A 4000A A 3000A A 4000A A 4000A A 4000A A F F I I I I I I 2A 2A F F 2A 2A 20A 2A 2A F F F F 5A 5A SCADA F SCADA F SCADA F SCADA F SCADA F SCADA F 6 5 ＊4 3 2 16A 16A 16A 16A ＊ ＊ 3x1C 500sqmm ＊ ＊ 2A 2A A 2A 2A 2A 2A 5x1C 500sqmm 5x1C 500sqmm 3x1C 500sqmm 5x1C 500sqmm 5x1C 500sqmm DCLA (P) DCLA (P) DCLA (P) DCLA (P) 0－3000A S/B Track N/B Track S/B Track N/B Track 900V 900V F F F 900V 900V 10kA 10kA 20A 5A 5A 10kA 10kA 2 3 4 5 6 5x1C 500sqmm＊ 5x1C 500sqmm＊ 3x1C 500sqmm＊ 3x1C 500sqmm＊ 5x1C 500sqmm＊ 5x1C 500sqmm 〈E1〉 ＊D 300A 300A N/B Track S/B Track F F V V N/B Track S/B Track I I ＊E 5A 5A AARU V V 1C 240sqmm CONTROLLER 64 64 64 300A 300A 64 64 64 64 CIS VV 1x1C 500sqmm 1x1C 240sqmm V V F I I F AARU RESISTOR 5A 5A CIS

Fig. 2 Abudulah Hukum TPSS Single Line Diagram Single line diagram of Abudullah Hukum TPSS power supply and distribution system.

(2) Ratings of Vacuum Circuit-Breaker (VCB) (a) Rated voltage: 36kV (b) Rated current: 2000A (c) Breaking current: 25kA 3.2 Power Conversion In each newly established and/or upgraded TPSS in this project, two power conversion equipment sets consisting of the rectifier transformer and the silicon diode rectifier convert 33kV AC to 750V DC. 3.2.1 Rectifier Transformer The rectifier transformer is an outdoor type, fluid immersed natural air-cooling unit. For insulation fluid, non-flammable silicone fluid is applied for fire protec- tion. The winding configuration for this transformer is Fig. 3 Outline of 33kV Switchgear three windings for 12-pulse DC output. Two low volt- Outline of 33kV air insulated switchgear. age windings are cross-configured in order to minimize short circuits. gear is shown on Fig. 3. (1) Ratings (1) Ratings of switchgear (a) Rated capacity: 3300kVA (a) Rated voltage: 36kV (b) Rated primary voltage: 33kV (b) Rated current: 2000A (c) Rated secondary voltage: 585V × 2 (c) Rated short time current: 25kA (d) Overload rating: Class VI (IEC 60146-1)

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Fig. 4 Outline of Rectifier Fig. 5 Outline of Positive DC Switchgear Outline of rectifier, rated 3000kW natural convention air cooling type. Outline of positive DC switchgear, applied our latest HICLAD-D.

(100%continuous, 150% 2 hours, 300% 1 minute) to-one basis for each switchgear. Those consist of the (e) Primary tap: 33kV ±1.25%, ±2.5%, ±3.75%, ±5% rectifier isolator, feeder circuit-breaker, bus-tie breaker, 3.2.2 Rectifier controlled isolated section feeder breaker, and AARU The rectifier is an indoor type, natural convention feeder breaker. air-cooling unit. Each diode leg has a diode fuse for Each switching device is controlled on a one-to- protection. The diode fuse has an alarm contact for one set of positive and negative, and only one control blown fuses, and the system is designed so that the command controls both devices. Each set of devices is rectifier will continue normal operation even if any one monitored so that their status remains the same, and leg fails and drops out of service. Therefore, the blown an alarm is activated in case the switching state differs fuse detection alarm is configured so that the fuse on between devices. each leg activates the alarm only, but it requires two On the track feeder circuit, load measuring is fuses to trip the rectifier. Fig. 4 shows an outline of the conducted. When the negative CB is closed, load rectifier. measuring will start, and after the status is confirmed, (1) Ratings the positive CB will close. In case load measuring finds (a) Rated capacity: 3000kW an abnormal condition on the load side circuit, the (b) Rated input AC voltage: 585V × 2 negative CB will open and will lock out both positive (c) Rated output DC voltage: 750V (12 pulse) and negative CBs. This lockout will be applied to the (d) Overload rating: Class VI (IEC 60146-1) above-mentioned circuit with one-to-one positive and (100% continuous, 150% 2 hours, 300% 1 minute) negative logic. 3.3 DC Power Distribution The protection relay is digital electronic and has The DC Distribution system for the Kelana Jaya normal overcurrent protection, delta-I, di/dt protection, Line applies the thrid and fourth rail system, and the and load measuring and re-closing functions. This neutral point between the positive and negative lines is relay is equipped only in the positive cubicle, and it grounded through 375 ohm grounding resisters. Thus, gives a trip command to both the positive and negative the positive pole of ＋375V and the negative pole of cubicles when the protection function is operated. －375V against the rated voltage between positive and Fig. 5 shows the outline of the positive DC switchgear. negative equal 750V. So circuit-breakers are applied to (1) Ratings for the DC Switchgear the negative pole. (a) Rated voltage: DC 900V The DC distribution system consists of the positive (b) Rated current: 6000A DC switchgear, negative DC switchgear, earthing panel (2) Ratings of isolator for neutral grounding, and the Automatic Assured (a) Rated voltage: DC 900V Receptivity Unit (AARU). (b) Rated current: 6000 A 3.3.1 Positive/Negative DC Switchgear (3) Ratings of DC high speed CB For the positive and negative DC switchgear, the (a) Rated voltage: 900V DC same numbers of corresponding Circuit-Breakers (CBs) (b) Rated current: 4000/6000A are configured for both positive and negative on a one- (c) Breaking current: 125kA

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Fig. 6 Outline of Earthing Panel Fig. 7 Outline of AARU Controller Outline of earthing panel Ð the DC neutral point is earthed in this cubi- Outline of AARU controller equipped with thyristor switches. cle through a grounding resistor.

3.3.2 Earthing Panel when the rectifier output current exceeds a set value. The earthing panel has 375 ohm grounding resis- Fig. 7 shows an outline of the AARU controller. tors to ground each positive and negative line with (1) Ratings positive to earth and negative to earth voltage meters (a) Rated voltage: 787.5V and an alarm function in case the voltage rises from a (b) Maximum voltage: 900V ground fault. Fig. 6 shows an outline of the earthing (c) Resistance value: 1.017 ohm/unit panel. 3.3.3 AARU 4. Postscript AARU is installed to ensure way side dissipation Kuala Lumpur is a major city with a population of of energy from electric-breaking transit trains, making 1.8 million (5 million in the metropolitan area) but has sure that only the power that needs dissipating is dissi- only four city lines, so automobiles are pated. AARU consists of a resistor to dissipate the the main means of transportation within the city area. regenerative power and a controller with a thyristor Now, the Malaysian government is moving toward a switch. The controller and resister consist of three units, modal shift and is planning to open many rail projects. and each unit is controlled to turn on and off independ- This Kelana Jaya Line upgrade project is one of those ently in order to adjust the power consumed by the programs that will take Kuala Lumpur into a modal shift. resistor. Lastly, we would like to express our special thanks The thyristor switch is triggered by voltage to to the project-related people and members. detect the regenerative power from the transit train. When voltage exceeds the set value, the thyristor switch ・All product and company names mentioned in this paper are the will close and energize the resistor circuit. This switch trademarks and/or service marks of their respective owners. is controlled to open after a set time from closing or

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