SHUNT CAPACITOR BANK PANEL
Product Overview
In the power system, there are capacitors connected in parallel to improve power factor. When the load in the power system has a low power factor, using these capacitors can result in reduced line currents, minimized voltage drops, and increased system capacity.
Additionally, power companies offer power factor discount schemes on basic tariffs, incentivizing efforts to improve power factor and reduce power bills.
Especially with power shunt capacitors, they're considered high-cost equipment, causing challenges in repair time and maintenance. Therefore, ensuring reliable protection for shunt capacitors is crucial due to its direct association with power quality.
The protection scheme for shunt capacitors involves using overcurrent, reverse power, overvoltage, and undervoltage elements for primary protection, along with secondary protection detecting phase imbalances using overcurrent.
For the protection distribution board of shunt capacitors, employing advanced technology like Siemens' 6MD8x for primary and secondary protection secures the protective functions.
It integrates years of accumulated expertise in protection relay manufacturing technology, including noise resilience, insulation strength, stable grounding, durability, and layout optimization, offering a more reliable product in production and supply.
SHUNT CAPACITOR BANK PROTECTION SYSTEM CONFIGURATION
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The 154kV Sh.C Bank protection is divided into System/Bank protection relays, consisting of two independent relays. The protection relay for the system utilizes elements such as overcurrent, reverse power, over/under voltage, and others to perform protection duties, including safeguarding against faults in the 154kV system and shunt capacitor facility failures. The protection relay for the Bank performs protection duties for each phase's capacitor to safeguard against phase imbalances in the equipment.
154kV SH.C BANK PROTECTION RELAY (6MD8x)
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- Digital Protection Relay with 32 Bit high-speed microprocessor
- Possible application of protective elements, including harmonics, for overload conditions in capacitor banks and reactors
- Detection functionality for internal faults and short circuits within the capacitor bank
- Protection features against mid-rack shorts occurring within the capacitor bank
- Undervoltage detection functionality to prevent failures due to capacitor bank re-energization
- Detection of three-phase imbalances utilizing neutral current inputs in the capacitor bank
- Detection of phase imbalances due to fuse disconnection or cell failure within the capacitor bank
- Overcurrent detection with harmonics included in the neutral point resistance grounding side
- Using any portable computing device, setting and fault analysis function (analysis program (DIGSI), Comrade File conversion function) becomes possible
MAIN FUNCTION
- 50/51 overcurrent protection factor
- 46 forward, time-limited negative-sequence current protection elements
- 50/51 net including harmonics, time-limited overcurrent protection element
- Over and under voltage detection protection elements
- Overcurrent protection element for unbalance monitoring including harmonics
- PT Fuse Fail detection function
- Logic elements that can be input after a certain period of time after opening the circuit breaker
- User logic implementation function
- Malfunction prevention function through various fault detection
- Self-diagnosis
- Metering (current, voltage, active/reactive power, etc)
- Event recording (trip, alarm, fail)
- Using any portable computing device, setting and fault analysis function
(analysis program (DIGSI), Comrade File conversion function) becomes possible
TECHNICAL SPECIFICATION/STANDARD
| Index | Item | Specification | |
|---|---|---|---|
| Rating | Power Supplyt | Voltage Inpu | DC : 48~300[V], AC : 80~265[V] (Frequency 50/60[hz]) |
| Power Consumption | Modular Type : Basemodule standard DC 13[W], AC 55[VA]/ Per expansion module : DC 3W, AC 6VA | ||
| Analog | Current(CT) | 1[A] or 5[A], Burden : Approx. 0.1[VA] | |
| Power(PT) | 0~200[V], Power Consumption < 0.1[VA] | ||
| Digital input |
Number of input : Selectable by applying multiple expansion modules Voltage range : 24 ~ 300[VDC] |
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| Digital Output |
Number of output : Selectable by applying multiple expansion modules Allowable current : 5[A](Continuous), 30A for 1s, 250A for 30ms |
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| Communication | Communication Port | RS-232, RS-485, Ethernet, FO(Fiber Optic) | |
| Protocol | Profibus, DNP3.0, IEC61850, TCP/IP | ||
| Time Synchronization | DCF77/IRIG-B/SNTP/IEEE 1588 | ||