Summary: The article introduced electric arc light to protect the configuration in hydroelectric station and application, offer relevant personnel to consult.

Keyword: Hydroelectric station; Switch ark; Electric arc is smooth

0 preface

Because produce ionization of the air when alternate with short circuit or ground connection short circuit,electric arc light is and form. In interior of cabinet of the switch in system of our country power breakdown of electric arc light happens from time to tome, and once produce arc breakdown,will reach equipment to be able to bring big harm to person.

Ark of switch of generatrix of exit of water turbogenerator group is the hub of important transmit electricity that hydroelectric station generates electricity. When producing in-house breakdown, whether to excise breakdown quickly, crucial to the production of the power station. Because of GB " the protection of power plant and automatic device design are normative " (GB50062) and active power trade rules are normative did not protect specific provision to 6KV(10KV) generatrix, because dynamo of this hydroelectric station exports bus to did not configure appropriative commonly,fast bus is protected, be aimed at the current situation that at present protection of generatrix of hydroelectric station middling pressure configures, special be necessary to add fast protection. A few experts of domestic also emphasize furnish all the time special in the value that low-pressure generatrix protects, the user also hopes to be able to offer a kind of cost inferior, the simple, generatrix that applies to 6-35KV protects the principle, reduce the bus breakdown harm to equipment with big limit, raise transmit electricity dependability.

The necessity that 1 configuration arc protects

In power system, because the generatrix of 35kV and grade of the following voltage did not stabilize an issue, general not furnish generatrix protection. However, as a result of in a line on low-pressure generatrix is much, the operation is frequent, the distance of distance of three-phase conductor space and earth is closer, suffer puppy harm easily, equipment production quality is poorer than high-pressured equipment, equipment insulation ageing and mechanical wear, moving condition is abominable, the system moves conditional change, the person is and handle the account such as the mistake, the breakdown odds of low-pressure generatrix compares high pressure in, press bus to be gotten high much. But long-term since, people is right in the protection of low-pressure generatrix takes seriously not quite all the time, also did not discover advanced and reasonable solution, accordingly, use the back-up protection that contains greater delay time to excise mother on-line breakdown mostly, often make breakdown is developed, expand, cause huge pecuniary loss thereby. Investigate because without the low pressure in furnish bus is protected,its reason is mostly, fail to excise breakdown place to cause quickly. So, move to assure what transformer reachs bus switchgear, according to protection the requirement of fast sex, urgent need configuration is special in low-pressure generatrix protection.

Below this kind of circumstance, electric arc light protects the ideal that in becoming user of broad hydroelectric station, low-pressure generatrix protects to choose. Light of special generatrix electric arc is protected not only behavioral rate is rapid, protection of tall and as special as other generatrix compares dependability have price advantage.

Our country imports light of special generatrix electric arc to protect at beginning to use 2004, at present power system, generate electricity especially system,

Make an appointment with 70-80 built a power plant to all use light of special generatrix electric arc to protect.

The 2 profit that use protection of arc light of special generatrix electricity

The light that measures as a result of protection system of arc light of photoelectricity form report and report are the parameter of property of two completely different physics, use smooth signal, the behavioral principle of double criterion of fault current signal decided him move by accident rate in wanting to compare a system other advocate protection (include a dynamo, transformer, circuitry) move probability to want by accident small, can ensure high pressure to open ark to move already, won't affect a power station to be produced normally again.

Use protection of arc light of special generatrix electricity to have the following advantages:

1) the staff member avoids the harm of arc getting report to person near protection.

2) low-pressure equipment is avoided in protection suffer play havoc with, prevent fire happening.

3) protection advocate transformer or the factory is avoided with transformer accept severe impact and caustic annulus.

4) prevent to affect the station uses dc system, avoid to cause huge pecuniary loss.

5) the power cut time that big limit ground reduces an user (user power cut restores time, by original 2-3 the week reduces less than of a few hours) .

6) the service life that prolongs existing switchgear.

The configuration plan of optical protection system of electric arc of 3 hydroelectric station

3. Protection system of 1 electricity arc light is configured

Protection system of electric arc light is average by advocate unit, patulous unit and composition of sensor of electric arc light, because use arc sensor to detect electric arc is smooth, output signal of breaker tripping operation through exit of high speed solid state, the response rate with this optical to electric arc system from detect electric arc light arrives give out fast time of tripping operation signal not to exceed 7 millisecond.

The protective act mechanism of system of electric arc light: Sensor is detecting after bus arc breakdown, convey arc signal patulous unit, expand unit transmits signal again through bus line next advocate unit. Advocate unit is in after getting signal, will give out tripping operation signal to jump the breaker that take a line to breaker hear, thereby the development of electric arc light.

Detect when sensor when the arc breakdown of cable room, patulous unit can beat directly the breaker of this ark, and won't affect into the line.

3. Plan of 2 electric principles

1) below normal circumstance, unit self check, arc sensor self check, if discover arc fault, all can give out arc breakdown information, in the meantime, if be device breakdown, exit of closedown tripping operation, avoid misoperation; This signal can be outputted by node of a give an alarm to give an alarm small generator or signal gather device.

2) generatrix produces electric arc light because of reason, the arc sensor of corresponding generatrix room detects after arc, upload signal patulous unit.

3) if be bus section to move, each advocate unit is in get arc signal while, compare the voltaic signal that oneself collects. Arc and electric current all satisfy criterion, it is paragraph of bus happening arc, issue tripping operation signal, tripping operation of this breaker of Duan Jin line, extinguish electric arc thereby, tripping operation signal gives out in the meantime.

4) if cable room produces arc breakdown, corresponding patulous and unit movement, jump this corresponding ark breaker.

5) if be sheet to move into the line,take I, Ⅱ paragraph bus, of each generatrix advocate while unit gets arc signal, reach transmit of arc signal synchronism instantly another advocate unit. Work take a line advocate unit gets arc signal (this Duan Chuanlai signal or another advocate unit transmit) , and electric current satisfies a requirement, issue tripping operation signal, breaker of start aside section, extinguish electric arc thereby, give out at the same time jump a signal, make sure other generatrix moves normally.

6) malfunction protection: If mother couplet breaker is out of order, start malfunction protection to jump low-pressure side takes a line; If low-pressure side enters line malfunction, start malfunction to protect high jump to press side breaker.

7) be like each paragraphs of generatrix advocate unit is exited move, criterion protection of this paragraphs of arc is exited.

Arc of 4 An Kerui ARB5-M protect product type selecting to explain

ARB5- arc advocate charge unit

(1) ＊ shows optional attachment, need 1500 yuan to raise cost additionally.

(2) advocate accuse board and collect board quantitative the sum cannot is more than 4.

(3) arc probe arrives collect board length cannot exceed 20 meters.

(4) if have special demand, please special make clear.

Arc of 5 An Kerui ARB5-M protect product function and technical parameter

Arc of 6 An Kerui ARB5-M protect product field assembly

Arc is protected advocate accuse unit, probe to install a graph to be as follows.

7 last words

As people the further research of smooth to electric arc breakdown is mixed understanding, a lot of hydroelectric station already began to use protection system of electric arc light, the inclined card hydroelectric station that like me the company designs, scattered ark of switch of high pressure of 10kV of much hydroelectric station to all configure electric arc light to protect.

We suggest bus adds protection system of electric arc light to serve as bus under hydroelectric station 35kV advocate protection, make up for the technical drawback that has bus back-up protection only at present thereby. Decrease or avoid the person that breakdown of arc light of electricity of switch cabinet interior brings to harm, improve productivity: Make the main facility loss such as switch and transformer falls low, production resumes inside short time; For hydroelectric station " nobody are on duty, little person value is defended " manufacturing mode provides necessary safeguard.