(3)Transforming ratio test
By applying current to the primary circuit of CT, current and phase angle shall be measured at
CT test terminals in distribution boards that are connected to the secondary (tertiary) circuit of CT in order to check that transforming ratio and polarization as well as connection between the CT and distribution board are proper.
(4) Load measurement
With the subject CT being fully loaded, the secondary circuitof CT shall be applied with the rated current and comprehensive load including distribution board and control cable shall be measured in order to check that it is the same level as design value.
(5) Core check
While primary current is flowing through CT ina transformation ratio test, the secondary circuit of CT shall be suddenly short circuited at the terminal block, and it shall be checked that the
reading of ampere meter connected to distribution board drop to zero, thus the subject CT is connected to a proper destination.
Chapter 5 Completion Inspection
Section 1 General
Article 41. General provision
Completion inspection for facilities of overhead transmission lines, underground transmission lines and substations shall be carried out according to Chapter 5 in Part 2 in Technical Regulation Vol.5 and this Guideline.
Section 2 |
Overhead Transmission Line |
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Article 42. |
Measurement of insulation resistance |
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Insulation resistance |
of overheadtransmission lines shall satisfy inspection items in the following |
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table. |
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Table 42 Inspection of insulation of overhead transmission line |
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Items |
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Method |
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Acceptance criteria |
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- Insulation resistance measured by the megger |
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shall be more or equal to the following values. |
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- Between each phase and the ground : 4 ×106Ω |
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Insulation resistance |
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Between a phase and the other phases : 8 ×106 Ω |
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- The value measured at one minute after the |
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of overhead |
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Measurement |
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measurement was started shall basically be |
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transmission lines |
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adopted. In case that the value is not stable, it |
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should be measured after the value becomes |
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stable. |
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- Use 2,500V megger for testing. |
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Article 43. Phase test
Phase test of overhead transmission lines shall be complied with Article 19 in this Guideline.
Article 44. Power-frequency operating voltage test
Dielectric strength of overhead transmission lines shall satisfyinspection items of power frequency withstand voltage test in the following table.
Table 44 Inspection of power frequency withstand voltage test
Item |
Method |
Acceptance criteria |
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- Insulators shall be confirmed that they have |
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prescribed dielectric strength by records of factory |
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test. |
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- Overhead transmission line shall be confirmed |
Dielectric strength |
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that measured voltage between conductors |
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energized by power frequency voltage (voltage |
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Measurement |
normally operated in the line) and the ground |
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which is recorded after one and ten minutes are |
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not significantly different from power frequency |
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voltage. |
Section 3 Underground Transmission Lines
Article 45. Appearance inspection (Route exploration)
Appearance of cable lines shall satisfy inspection items in the following table.
Table 45 Inspection of appearance of cable
Items |
Method |
Acceptance criteria |
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- Kind, nominal cross sectional area and number of |
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cables shall be in accordance with the |
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specification. |
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- The position of connection boxes and terminal |
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boxes shall be in accordance with the |
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specification. |
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- Fixed condition of the cable, connection boxes, |
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terminal boxes and the grounding conductor shall |
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Visual inspection |
be in accordance with the specification. |
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damaged, and the installed condition of the cable |
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room shall be in accordance with the specification. |
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- Installed position and condition of the oil supply |
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system shall be in accordance with the |
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specification. |
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- Operating performance and installed condition of |
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alarm system shall be in accordance with the |
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specification. |
62
Article 46. Measurement of insulation resistance
Insulation resistance of the cable shall be complied with Article 18 in this Guideline.
Article 47. Phase check
Phase test of underground transmission lines shall be complied with Article 19 in this Guideline.
Article 48. (moved to Article 26-a1)
Article 49. Clearance between live part and fence or wall
The clearance between live part exposed from cable lines and the fence or the wall shall be complied with Article 50 in this Guideline.
Section 4 Substation Equipment Article 50. Visual inspection
1. State of installation of equipment which generates arc
It shall be checked that the equipment which generates arc such as circuit breaker and disconnector is isolated from combustibles at a safe enough distanceThe. criteria of isolating distance between the equipment which generates arc and combustibles are shown in Table 50.
Table 50 Criteria of isolating distance between the equipment which generates arc and combustibles
Nominal voltage |
Isolating distance * |
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7kV and less |
1m and more |
More than 7kV |
2m and more |
In case hat the direction and length of arc |
are |
restricted so that thereis no fear of fireand the |
1m and more |
nominal voltage is 35kV and less. |
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* Note: The abovedistance shall not be applied when fireproof materials are installed between the equipment which generates arc and combustibles.
2. State of installation of charged part
It shall be carried out according to the inspection items specified separately inArticle 335, 337, 338, and 343 of Volume 1.
3. Testing of installation of fence, wall
The height of fence and wall, and the various types of minimum clearance such as protective barrier clearance, boundary clearance, minimum height over accessible area and building clearanceshall be carried out according to the inspection items specified separately inArticle 335, 337, 338, 343 and 349 of Volume 1.
63
Article 51. Measurement of grounding resistance
Grounding resistance shall be measured to confirm that the measured value meets standards provided in Article 572 of the Volume 1.
Article 52. Supervisory and control test
1. Switching test
By operating circuit breaker, disconnector, etc. which are controlled from the control room or load dispatch center, it shall be checked that each equipment works properly and the indication in the control room or load dispatch center changes correspondingly. Inaddition, switching indicator of the controlled equipment shall also be checked to work properly.
2. On-load tap changer test
By giving tap-changing instruction from the control room or load dispatch center to the transformer, it shall be checked that the tap changes in accordance with the instructionIt shall. be carried out according to the inspection items specified separately in item 8. (1) of Article27.
3. Protective device test, Alarm indication test
By activating relay compulsorily for every protective device or alarm device, it shall be checked that the operation of the related equipment and the indication in the control room or load dispatch center correspond exactly to the design diagram.
4. Actual Loading Test for protective relay and control equipment
As a final check using voltage and current on actual power system, the following testsbeshall implemented.
(1)Voltage and phase check
It shall be confirmed that the phase arrangement meets the design diagram by measuring and comparing the voltage of testing line and another charged line.The voltage shall be measured at test terminals on distribution boards.
(2)Voltage, current and phase angle measurement
Voltage, current and phase shall be measured at test terminalson distribution boards. It shall be confirmed that the measured voltage and current are appropriate considering the PT and CT ratio and that the phase differences between measured values are appropriate considering the polarity and connection of PT and CT.
(3)Directional test
It shall be confirmed that the direction, polarity and phase difference of measured voltage and current are appropriate.
(4)Residual current and voltage measurement
Residual current and voltage shall be measured to confirm that the measured value corresponds to the imbalance if there is an imbalance among three phase current or voltage.
(5)Id (differential current) check
Differential current shall be measured to confirm that the measured value is nearly equal to 0 in a normal state.
64
Article 53. Interlock test
It shall be carried out according to the inspection items specified separately in Article 31.
Article 54. |
(moved to Article 27-34, 36-38) |
Article 55. |
(deleted) |
Article 56. |
Measurement of noise and vibration |
(1) Measurement of noise and vibration
Noise and vibration level shall be measured at the boundary of a substation yard. It shall be confirmed that the measured value is within the local regulation such as Table6-1 and5 562-. In case of measurement, the influence of sound sources besides the substation shall be excluded.
Table 56-1 Maximum permissible noise levels in public and residential areas
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(dB) |
Area |
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Time |
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From 6am to |
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From 6pm to |
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From 10pm to |
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6pm |
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10pm |
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6am |
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1. The places requiring special silence: |
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hospitals, schools, libraries, sanatorium, |
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50 |
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45 |
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40 |
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churches, temples |
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2. Residential areas, hotels, resorts, |
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60 |
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55 |
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50 |
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administrative offices |
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3. Residential areas alternated with |
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75 |
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commercial, service, productive areas |
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Table 56-2 Sound pressure levels at working places |
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Equivalent |
Sound level at |
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of medium |
frequencies (Hz) |
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not exceeding (dB) |
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Working place |
pressure |
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level |
63 |
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125 |
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250 |
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500 |
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1000 |
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2000 |
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4000 |
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8000 |
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(dBA) |
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At working, production |
85 |
99 |
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92 |
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86 |
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83 |
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80 |
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78 |
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76 |
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74 |
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places |
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Remote control room, |
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experimental rooms with |
80 |
94 |
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87 |
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82 |
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78 |
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75 |
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73 |
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71 |
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70 |
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noise resources |
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Remote control room, |
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experimental rooms |
70 |
87 |
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79 |
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72 |
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68 |
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65 |
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63 |
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61 |
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without noise resources |
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Functional rooms |
65 |
83 |
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74 |
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68 |
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63 |
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60 |
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57 |
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55 |
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54 |
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(accounting, statistics etc.) |
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Research, design, |
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computer, experimental |
55 |
75 |
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66 |
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59 |
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54 |
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50 |
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47 |
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45 |
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and data treatment rooms |
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65