July 23, 1987 metropolitan area great blackout

A July 23, 1987 metropolitan area great blackout (July 23 にちしゅとけんだいていでん where 1987 does not lie) is the large-scale blackout that occurred (1987) in a metropolitan area of Japan on July 23 in 1987. Power supply stopped with 2,800,000 houses (supply trouble electricity 8,168,000kW) of 6 capital prefectures such as Tokyo and became the massive blackout.

Table of contents

Summary

Because of intense heat, electricity demand was prolonged after lunch break rapidly. It is said that the growth of the demand was 400,000kW per one minute.

With growth of the electricity demand, the reactive power spent a condenser for the electricity installed in the transformer substation in sequence rapidly at growth, the electric power company, too and restrained the reactive power.

At 1:07 p.m., I spent the gross quantity of the condenser for the electricity, but the bus voltage of the transformer substation of the basic system decreased without catching up with growth of the reactive power (it is said that it was 370,000-390,000V in a 500,000V bus), and, by movement of UVR (lack voltage relay), a nucleus pro-transformer substation became the blackout (1987) at about 1:19 on the afternoon of July 23 in 1987, and the transformer substation of subordinates was lost power (Sasame, north Sagami is Hadano, Shinfuji transformer substation newly Southwest Kanto Teshima, Kyoto north, North Tokyo, Tama, Ageo, Ikegami transformer substation, and a blackout occurs Middle Kanto). A blackout happened in Nagatacho, Chiyoda-ku with the Diet building and I could hold the Committee on the Budget and disappeared.

In addition, because the rotary speed of the generator increased because load decreased rapidly in the relay operation of the nucleus system transformer substation, and a rise in commercial power supply frequency occurred, generator OFR (rise in frequency relay) of the Kawasaki thermal power station sixth unit and the Kashima thermal power station fourth unit and the sixth unit worked, and a power supply fell off it.

In the blackout area, in East Shizuoka, West Kanagawa, Middle Yamanashi, South Saitama, Tokyo Tama, Arakawa-ku, Adachi-ku, Bunkyo-ku, Kita-ku and Middle Kanto restored in approximately 30 minutes, but Southwest Kanto needed three hours 21 minutes by complete restoration. On the other hand, as for the power supply which fell off, as for the Kashima sixth unit, as for the Kashima fourth unit, the Kawasaki sixth unit stood in a row after blackout outbreak again in approximately one hour 50 minutes for approximately one and a half hours for approximately one hour 20 minutes.

Cause

What dealt by the injection of the condenser for the electricity for a rapid increase of the reactive power, but a movement point in the P-V curve changes in the domain of the instability solution because I was not able to cope with reactive power demand though I spent a gross quantity, and reached the voltage collapse (the state that cannot maintain the voltage in the whole system) is a cause.

Electric currents increase to control it not to lose an air conditioner function even if an inverter airconditioner has decreased voltage as much as the voltage decreased, and it is said that there was a vicious circle inviting a voltage drop to more.

Unlike a normal blackout, it is characteristic that electric accidents such as a short circuit, the ground are not triggers. I take the wrong prediction of the reactive power outbreak to occur with an electric power system in 重負荷, and the biggest factor of the blackout accident is to have neglected the enlargement of the condenser for the electricity.

Preventive measures against recurrences

• I prepare a power supply (pumping power station) which can follow a rapid increase of the load
• As reactive power rapid increase measures, it is established RC (synchronization-like aspect machine), SVC (standstill form reactive power compensation device)
• Enlargement of the condenser for the electricity
• Voltage high use (I raise the bus voltage of the nucleus system to around +5% of the official name voltage and raise the terminal voltage of the generator to around +3%) of the system basic by the use of facilities
• I perform a demand predictive calculation from the result that measured electricity demand online and perform the control of the generator and the tap control of the transformer

Allied item

• Blackout
• List of blackouts
  • Metropolitan area massive blackout
• Voltage collapse
• P-V curve

The correction of this knob is expected.

Outside link

• Tokyo Electric Power homepage
• The past massive blackout example (PDF) public corporate judicial person Institute of Electrical Engineers of Japan

This item is a disaster, an unfinished item in conjunction with the disaster prevention. I demand the cooperator who corrects it, and corrects this item (a project: disaster /Portal: disaster).

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