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| A formation of a power system has a structure
that transfers a power from a power source
located in suburban area to an urban area
that needs a large amount of power demand.
A transmission network has parallel dual lines
for a power transmission in order to avoid an
outage when fault occurs, however as a
power customer getting increased there is a
dangerous factor which can generate an
outage in nationwide when a fault occurs in a
transmission network. Thus when medium to
large fault occurs there could be an accident
in both lines of transmission network,
generating a severe problem in stability of
power system due to a transmission network
or an over current of a generator. Such as
solution is needed for maintenance of current
distribution and balances in power customer,
and a Special Protection System is used for
this purpose. |
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| A special protection system maintains power
system’s stability when a serious fault occurs
in power system and constantly supplies
power by estimating a maximum current. It is
used for a prevention of transition instability at
generating end and for a prevention of voltage
instability at a power customer’s end. Thus,
protection functions such as over-current
detection, current detection, negative sequence
over current detection, over/under voltage
detection, ground over voltage detection, and
breaker activation detection are used.
Especially current detection function maintains
stability through a prompt activation by
detecting an open state of facing end through
detection function of power change ratio. |
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| GABO’s Special Protection function has a
main protection relay 7SJ64 made from
SIEMENS, in order to guarantee reliability. By
having accumulated knowledge in
manufacturer technology of protection panel,
and experienced professionals, we strive to
accomplish noise immunity, stable earthing,
durability, insulation, assembly, all of which
being incorporated in order to generate
products of credibility. |
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SPECIAL PROTECTION SYSTEM CONFIGURATION |
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| A system configuration of Special Protection
System shows when dual circuit breaker opens
due to a fault in parallel dual circuit transmission
network configuration, it implements a function set
as to detect any problems. It implements
protection factor through calculation of dual circuit
voltage, current input, and receives an information
of state of a breaker, in which performs as
protective role by monitoring in real time basis
any existence of fault in transmission lines and
operation state. |
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SPS- SPECIAL PROTECTION SYSTEM PROTECTION RELAY PANEL (7SJ64) |
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| CHARACTERISTICS |
- Digital Protection Relay with 32 Bit high-speed microprocessor.
- Flexible function (protection functions through inputs of voltage, current, frequency, power etc)
- User define logic through CFC (continuous function chart)
- Text/ Graphic LCD selection for HMI
- Multi-function relay through electric computation through voltage, current and power.
- Supports various protocol (DNP 3.0 PROFIBUS, IEC-61850 etc) for monitor/control
- Visual synchronization through IRIG-B/ DCF 77
- Using any portable computing device, setting and fault analysis function (analysis program
(DIGSI), Comrade File conversion function) becomes possible. |
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| MAIN FUNCTIONS |
| - Over current detection (True RMS detection including harmonic wave). |
| - Power current detection (power ratio change detection). |
| - Breaker Failure protection |
| - Directional over current detection (True RMS detection including harmonic wave). |
| - Negative phase over current detection. |
| - Frequency detection. |
| - Over/ under voltage 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), Contrade File conversion function) becomes possible. |
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TECHNICAL STANDARD/SPECIFICATION |
| Index |
Item |
Specification |
Remarks |
| Rating |
Power Supply |
Voltage Input |
DC : 125[V], AC : 230[V] (Frequency 50/60[hz]) |
Selectable |
| Power Consumption |
7/9[W], 15/23[VA] |
| Analog |
Current |
1[A], Burden : 0.05[VA]
5[A], Burden : 0.3[VA] |
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| Power |
100[V], Power Consumption ≤ 0.3[VA] |
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| Digital input |
Number of digital input : 8 ~ 48
Voltage Range : 88 ~ 300[VDC] |
Selectable |
| Digital Output |
Number of digital output : 6 ~ 30
Allowable Current : Continus(5[A]), 30[A](0.5[sec]) |
| Communication |
Communication Port |
RS-232, RS-485, Ethernet, FO(Fiber Optic) |
Selectable |
| Protocol |
Profibus, DNP3.0, IEC61850, TCP/IP |
| Time Synchronization |
DCF77/IRIG-B/SNTP |
Selectable |
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