The millisecond response failure, this power "airbag" is very special

June this year

It is the 21st National Safety Monthly

Resolutely keep the big power grid security lifeline

It is the top priority of power grid companies

in daily life

If a household high -power electrical appliance fails

Generally triggers the switch jumper

Prevent accidents

This is fault protection

In fact, fault protection exists in the power system

every session

The stream station is an important part of it

today

Take everyone to dissect "a sparrow"

Take a look

Baihe Beach-Jiangsu ± 800 kV high pressure

DC transmission engineering stream station

If a failure occurs

How should power people guarantee the security of the power grid?

△ Yucheng changed stations.

Yucheng Streaming Station is Baihe Beach-Jiangsu ± 800 KV high-voltage DC transmission project

Site to Jiangsu

Yucheng changed station uses the world's first first

Conventional DC and Flexible DC hybrids

As the last safety defense line of the project

Fault protection is the top priority

What are the problems currently facing the fault protection of the stream station?

Yucheng changed the stations, and bears the heavy responsibility of converting DC electricity from Sichuan to AC power, and then sent to thousands of households in Jiangsu.

For conventional stations, the DC system voltage is affected by the voltage of the AC system. Once the AC system fails, the DC system will not be able to run normally.

After the Yucheng replacement station adopts conventional DC and flexible DC hybrid technology, the DC system voltage is not affected by the voltage of the AC system. Once the AC system fails, the DC system can continue to transport. However, the excess energy generated by the DC system will cause damage to other key equipment.

If the DC system is suspended, although it can ensure safety, once the failure is eliminated, the DC system will take a few days to affect reliable power supply.

Then, is there a fault protection measure

When the communication system fails

It can protect the key equipment and not damaged

Can it not affect the normal operation of the DC system?

The electric man thought of — airbags!

Well known

When a car collides

The airbags can play for drivers and passengers

Key protection

△ Automotive airbag played (picture source network

In order to keep the DC system without stopping

Protection of failure

Engineering and technical personnel developed and applied

Electricity "airbag" -

The world's first ± 400 kV DC can control

Self -recovery Energy Device

△ The world's first ± 400 kV DC can control the self -recovery and eliminate energy

Just like the car suffers from a certain collision

The airbag will be inflated quickly

Absorb the inertial impact of the driver

So as to reduce the damage of personnel

Change stream station in Yucheng

When the communication system fails

Electricity "airbags" will respond in milliseconds

Absorb the excess energy generated by the DC system

Prevent core devices such as streaming valves and other core devices are damaged due to excessive voltage

After removal of the recovery of the communication system failure

The time consumed by the DC system restart

△ Yucheng changed stations.

However, different from

The softness of the airbag

The electric version "airbag" is a one

"Steel tough guy"

It is a large -capacity lightning weapon, ultra -high -speed trigger gap switch,

Ultra -high -speed crystal tube electronic switch,

Advanced equipment such as fast mechanical switch

△ Lightning mock tower.

The lightning absorber is the key component of this power "airbag"

The tower of about 14 meters high

Each layer is composed of 136 lightning arresters

A total of 5 layers of 680

Two sets of anti -energy devices have a total of 1360 lightning offers

With this series of hardcore equipment

Failure protection is naturally reliable

Its failure response is less than 1 millisecond

The absorption energy can reach 300 mega focus or more

Before this behemoth goes to work

Whether it already has a normal working state

"Physical Examination" before post

To prevent the lightning mock tower

Damage occurs during transportation installation

June 17th

State Grid Jiangsu Academy of Electric Sciences completed two sets

The world's first ± 400 kV DC can control self -recovery and consumer energy device

Lightning -resistor group high -voltage test

At this point, the two sets have the condition of "on -the -job" condition

What is a high -pressure test?

"Reference voltage" and "leakage current" are the two key indicators of signs of the health state.

The high -voltage test of the lightning offer is to compare the leakage current under the test measured DC reference voltage and 0.75 times reference voltage, compare with the national standard value, and determine whether the missionarrant is qualified.

Use traditional test equipment for lightning offers

Perform high -pressure test

Only about 13 can be completed every day

According to this calculation, at least 3 months of consecutive tests need to be tested for 3 months

In order to complete the test work of 1360 lightning arresters

This obviously cannot keep up with the progress of engineering construction

Develop a new test equipment and carry out the entire group of minefield tests

The top priority for becoming a power researcher

△ Part of the structure of the emperor energy device of Yucheng replacement station.

State Grid Jiangsu Academy of Electric Sciences proposed

Multi -column parallel DC high -pressure generator overall pressure test method

In this way

You can test the 136 lightning arresters per layer at the same time

All minefarers can be completed within 1 week

△ Professionals are doing test preparation.

State Grid Jiangsu Academy of Electric Sciences Joint relevant units

Innovative development

DC test integrated equipment

And measurement and control unit

Solved the uneven diversion of the multi -column mineslinkler under pressure

technical challenge

How to conduct high -pressure tests?

Professionals installed 136 measurement and control units on each layer of low -voltage end, and then connected the measurement and control unit in parallel and grounding. Each layer of the high -pressure end of the minefarers formed a test point, which was tested by connecting the DC high -pressure generator through the wire connection.△ Professionals install and control the measurement and control unit for the lightning offer.

The test personnel received and returned the data collected by the test control unit through the wireless transmission device to determine whether the lightning weapon was qualified.

△ High -pressure test scene.

When the two minefield tower completes the "physical examination"

After connecting with other components through the wire

Electricity "airbag" is about to be officially "entered"

Under the careful care of the power man

Electricity "airbag"

It will effectively guarantee clean hydropower from Sichuan

It is constantly developing for Jiangsu's high -quality development

Inject surging kinetic energy

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