Items on labor safety

-Temperature: 45 degrees Celsius or less.

-Oxygen concentration: 18 % or more.

-Illumination intensity: 2 LX or more.

Chapter 9 PROTECTIVE RELAY AND AUTOMATION

Article 338. General provisions

It is necessary to remove promptly the accident that occurs in the electricity system because of the stable operation of the system and the damage reduction of the accident equipment. Therefore, it is necessary to establish the protective relay deviceto remove quicklyan appropriate range of the location that became an accident. The following points are considered in adjusting the setting value of the protective relay device.

The protective relay device shall work for all kinds of accidents assumed in the state where a system is usually operated.

The protective relay device should be able to work for the accident that occurs in any location in the system. Therefore, the protection range of each protective relay device should overlap partially.

As for the low-voltage network, the breaker with the overcurrent protection functionor the fuse can be applied for the overcurrent protection in consideration of the operation sensitivity and the operation time. In addition to this, the circuit breaker with detective function of leakage current can be applied for the grounding fault protection under the condition that the necessary requirement is satisfied.

Article 339. Responsibility to management and operation

The protective relay device, the automatic monitor and control equipment arecategorized based on the importance and theinstallation place. The charge unit concerning the operation and maintenance is decided by the management responsibility unit.

(Reference) The example of categorization in Japan is as follows

(1) Division in operation

Table 339-1 Categorization of equipment in operation

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Article 340. Required to ensure operating procedures and operating facilities

The administrative unit shall editinternal" operation maintenance bylaw"for each installation substation of the protective relay device, automatic monitor, and control equipment in consideration of each special condition, notice with related units. The "internal operation maintenance bylaw"shall be distributed to the related units. Statement item of “internal operation conservative bylaw” selects below appropriately as reference.

(Reference) The example of the items mentioned in Japan

Table 340 Description item and content of operation and maintenance by law

Article 341. Signing and numbering

Set up the signboard that can show the state clearly by watching in these devices.

In addition to the above, as for the name of each device, in order to prevent misunderstanding, the name which load-dispatching center assigns shall be used.

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Article 342. Inspection of related facilities to protective relay and automation facilities

The inspection of the related facilities and equipment shall be carried out in accordance with the relevant requirements in Vol.5.

Work safety concerning during inspection shall depend on the relative regulations.

Units in charge of work management shall develop an annual plan of periodicinspection based on the records in last year and shall manage the progress of inspection. Theperiod of periodic inspection shall be decided in accordance with other relative standards. And inspection procedure and judgment standard are decided in accordance with the regulations in the Vol.5.

Article 343. Inspection of protective relay, automation facilities

[Inspection]

Inspections of protective relay device and automatic supervision and control system are categorized as follows.

a.Routine patrol

b.Periodic inspection and examination

c.Extra inspection and examination

Method and judgment standard of periodicinspection and examination are in accordance withthe regulations stipulated in the Vol.5.

The units in charge of inspectionare decided according to the following table and these units shall carry out inspection according to the work plan decided by management responsibility unit.

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*1: This test is carried out in order to check whether the operating value ofgrounding fault protective relay is appropriate to make this protective relay work properly in case of grounding fault.

The reason is that actual grounding fault test at the site is necessary to adjustthe operating value properly, because, as for the distribution line, the parameters of the line cannot be calculated due to the installation of many cable lines.

Table 343-2 Units in charge of inspection of automatic load-dispatching equipment

The extra inspection and examinationof the protective relay device are executedin the following cases.

a.When a protective relay device is judged to have carried out unjust operation

b.When the characteristic needs to be checked in setting change of the protective relay device

c.When related equipment or the circuit of the protective relay device arechanged and accordingly the examination is needed

d.When abnormality occurs in the protective relay device or abnormality is expected to occur.

e.Necessary cases other than those above

The extra inspection and examination of the automaticsupervision and control equipment are executed in the following cases.

a.When automatic supervision and control equipment is judged to have carried out unjust operation

b.When the characteristic needs to be checked in setting change of theautomatic supervision and control equipment

c.When related equipment or the cuitir of theautomatic supervision and control equipmentare changed and accordingly the examination is needed

d.When abnormality occurs in theautomatic supervision and control equipmentor abnormality is expected to occur.

e.When comprehensive inspection of the system is necessary

f.Necessary cases other than those above

[Repair]

When abnormality isfound in routine patrol or inspection,unit in charge of operation and administrative unit of the equipment shall execute repair work according to the following procedures

1.Unit in charge of operation shall send notification to related units according to the communication route which is decided beforehand.

2.The related units which receive notification shall carry out necessary action properly.

3.Administrative unit shall carry out repair work and keep its record.

[Setting]

Setting work of the protective relay device and the automatic supervision and the control equipment is carried out as the following procedure.

a.Determination of setting value

b.Procedure of preparation to adjust setting value

c.Adjustment of setting value

a. Determination of setting value

The unit in charge of determination ofsetting value is definedaccording to classifications of