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| Generator, one of the most fundamental and
important electric power facilities, composes as a
part of power systems and generates electric
power. |
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| Thus, stable operation and protection/control of
generator are critical factors necessary for
supplying electric power to the power-customer. |
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| Depending on source of energy, generator is
divided into hydro electrical power, thermal
electrical power, nuclear electric power, and as
renewable energy such as solar and wind power is
getting more attention recently. |
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| In many electric power facilities protection systems,
a field related to generator protection system
critically needs experience in high technology and
design ability. Also, it is very professional that
needs knowledge of generator system itself and
know-how in order to commission and engineering. |
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| Generally, considering the importance of electric
power generation facility, protection system
configuration is composed of completely
independent redundant systematic protection
system with 1st protection system and 2nd
protection system. Applying protection relay is
current differential protection as a main protection
function and protects generator rotor and stator by
using over-current, over- voltage and negative
sequence over current protection element. And for
power system stability such as frequency, active/
reactive power, and various other protection
elements are used. |
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| GABO’s generator protection panel has a
protection relay (7UMX) 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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GENERATOR PROTECTION SYSTEMS CONFIGURATION |
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| In a generator protection system, composition is different
according to the kind of power generation facility, scheme
of protection and protection philosophy that has been
maintained in each country. |
| Generally, main protection is used with a current differential
protection between primary and secondary winding for
detecting generator’s internal fault. And depending on
system configuration and experience in design, main
protection zone for generator protection could include stepup
transformer. |
| Considering performance and reliability of system,
redundant system composed of first protection and second
protection has been used. |
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FLEXIBILITY OF FIELDS APPLIED |
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| A generator protection panel with application of 7UMx
developed by SIEMENS could be used in not only generator
protection but also in motor, shunt reactor and transformer
protection. |
| Thus, it could be used in a protection of electric power
generation facility with step-up transformer, also in pumped
storage power plant having characteristics of generator and
motor, guarantee to provide economy and credibility of system. |
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GENERATOR PROTECTION PANEL APPLICATION |
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| A generator protection panel is designed accordingly to
various protections scheme in which fitted into each kind
of electric power generation facility. Our generator
protection panel with 7UMx, can be applied for protection
of following various generator facility. |
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| - Hydro power generation plant protection. |
| - Pumped storage power generation plant protection. |
| - Diesel power generation plant protection. |
| - Gas turbine power generation plant protection. |
| - Steam turbine power generation plant protection. |
| - Self power generation facility protection. |
| - Wind turbine power generation plant protection. |
| - Renewable energy power generation plant protection. |
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GENERATOR PROTECTION RELAY (7UMx) |
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- Provides various applications with multiple protection function. |
| - Protection function including electric power generator/ motor/ transformer. |
| - 100 % Stator earth fault protection using thirdharmonic element. |
| - Stator earth fault protection using 20 Hz voltage element. |
| - Impendence protection element (distance protection element). |
| - Differential current protection element for ground fault. |
| - Restricted earth fault protection. |
| - Out-of-Step detection function. |
| - High sensitive earth fault of rotor detection function. |
| - Voltage input circuit fault detection function. |
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CURRENT DIFFERENTIAL PROTECTION CHARACTERISTICS |
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| Depending on ratio between
differential current and restraint
current, it is divided into trip area
and non-trip area. In restraint
current, stable restraint
characteristics is provided
considering current transformer
error, synchronization error, and CT
saturation. Differential current
protection function provides
distinguished trip characteristics in
order to detect a phase-to-earth
fault and a phase-to-phase fault of
a power generator. |
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EXCITATION SYSTEM FAULT PROTECTION |
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| Excitation system fault protection uses
impendence/admittance detection element by
utilizing generator’s terminal voltage and
current. For a credible detection,
characteristics of 3-step protection zone are
provided. |
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ELEMENTS OF PROTECTION RELAY (7UMx) |
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| - Current differential protection (87G/87T/87M). |
- Over Excitation protection. |
- Self-diagnosis. |
| - Ground fault of stator winding protection. |
- Excitation system fault (exciter loss) protection. |
- Metering (current, voltage, active/ reactive power, etc) |
| - High sensitive stator/rotor ground fault protection. |
- Negative phase sequence detection. |
- Event recording function (trip, alarm, fail, etc) |
| - Stator overload protection. |
- Circuit breaker failure protection. |
- Using any portable computing device,
setting and fault analysis function
(analysis program (DIGSI), Comrade File
conversion function) becomes possible. |
| - Over current/ over voltage protection. |
- Impedance protection. |
| - Frequency protection. |
- Out of step protection. |
| - Active/ reactive power protection. |
- Circuit breaker trip coil supervision protection. |
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GENERATOR PROTECTION TECHNICAL STANDARD/SPECIFICATION |
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| Index |
Item |
Specification |
| Current differential ralay |
Distance relay |
| Rating |
Power Supply |
Voltage Input |
DC : 125[V], AC : 230[V] (Frequency 50/60[hz]) |
| Power Consumption |
15[W], 15[VA] |
| Analog |
Current |
1[A], Burden : 0.05[VA] |
| 5[A], Burden : 0.3[VA] |
| Power |
0 ~ 200[V], Power Consumption ≒ 0.3[VA] |
| Digital input |
Number of digital input : 7/15
Voltage Range : 88~300[VDC] |
8/16/22/24 |
| Digital Output |
Number of digital output : 12/20
Allowable Current : Continus(5[A]), 30[A](0.5[sec]) |
15~43 |
| Communication |
Communication Port |
RS-232, RS-485, Ethernet, FO(Fiber Optic) |
| Protocol |
Modbus, Profibus , DNP3.0, IEC61850, TCP/IP |
| Time Synchronization |
DCF77/IRIG-B/SNTP |
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