ro le tan so 81

7/28/2019 ro le tan so 81

http://slidepdf.com/reader/full/ro-le-tan-so-81 1/4

HCMC PC SPECIFICATION

DIGITAL, DEFINITE TIME FREQUENCY RELAY (81)

I. SCOPE :

This specification covers the supply of digital, definite time frequencyrelay (81).

II. STANDARD OF MANUFACTURE AND TEST :IEC 255 : Electric relays.

III. TECHNICAL DATA :

1. Construction :- The relay should operate on the basis of numeral measuring principle.- Terminals : Plug - in crew type.- The relay consists of a case used for flush mounting and will be supplied

with all accessories for installation and operation.-

An alarm output is also provided to signal a critical alarm such as powersupply failure or self-check failure.

2. Technical data :

- The protective function :+ Under or over frequency.+ Under voltage (When the voltage lower 60% Vn, the relay will be

locked).

- DC supply : 90 ÷ 240 Vdc.

Tenderer may quote the relay with operating voltage of 110Vdc±10%

and the voltage divider to be able to supply the operating voltage of 220Vdc to the relay.

- Display : LCD.- Settings :

+ Over frequency (f1 >) : 51 to 55.75 Hz adjustable in steps of 0.25Hz.

+ Under frequency (f2 <) : 45 to 49.75 Hz adjustable in steps of 0.25Hz.

+ Time delay : 0.4s to 4.4s adjustable in steps of 0.4s.+ Under voltage : When the voltage lower 60% Vn, the relay will

be locked.- Operating time :

+ Response time : 180 ms+ Reset time : 180 ms

- Contacts : 4 NC + 4 NO- Contact ratings :

+ For 0.2s : 30A and 300VDC+ For continuous : 5A and 300VDC

-Mechanical durability :+ Loaded contact : minimum 10.000 operations.+ Unloaded contact : minimum 100.000 operations.

/var/www/apps/conversion/tmp/scratch_4/138238322.doc 1/4

7/28/2019 ro le tan so 81




- Accuracy :

+ Timing circuit : ± 5%

+ Frequency measurement : ± 0.05Hz

+ Immunity to 2nd - 5th harmonics : 5%+ Blocking on abnormal loss of monitored voltage : 0.6Vn ± 15%- Environment :

+ Ambient temperature : 0 to 55oC+ Humidity : 0 - 95%.

IV/. TESTING REQUIREMENT :

- The relay is subject to inspection during manufacturing. Routine andtype tests of each relay including operational test at minimum,accuracy tests will be performed according to IEC 255 standard.

- In order to ensure the quality of supplied goods , in case of bid winning

, the Tenderer shall supply routine test and copies of type test reportmet the following requirements:a. Routine test shall be performed for each equipment.b. Type test report shall meet the followings :

- Testing sample : The same as the supplied item (manufacturer,original country, manufacture’s code as specified in tender document).

- Testing items : Including testing items according to IEC 255.- Testing values shall be corresponding values as stated in Section III

of this specification. If in section III, there are no corresponding values,testing values will be selected according to the standard specified insection II of this specification.

V/. REQUIREMENT OF TECHNICAL TENDER DOCUMENT :

- Technical description, data sheets, catalogues and other materialsubmitted with the quotation must enable the buyer's engineers tothoroughly evaluate the proposals as to its compliance with the inquiryspecifications.

- Minimum requirements :+ Detailed summary of deviations to inquiry specification.+ Completed inquiry data sheet expressed at clause VI.+ Brochures and catalogues containing outline dimensions, main

electrical dataand installation details.+ Certificate of quality management.

- The proposal bidding has Type Test Report which meets therequirements as specified in item IV 2.b will be preferable.

VI/. DATA SHEET :

No SPECIFICATION UNIT REQUIREMENT TENDE

R

1. Item No.

2. Manufacturer3. Country4. Manufacturer’s code


7/28/2019 ro le tan so 81




5. Standards of factory andtest

IEC255

6. Standards of qualitymanagement

7. Member approve of certificate of management

8. In case of bid winning ,the Tenderer shallsupply routine test andcopies of type testreport met therequirements of sectionIV .

Yes

9. Type Microprocessor10. Display LCD11. Terminals Plug - in screw type12. Case Flush mounting The

relay will besupplied with allaccessories forinstallation and

operation.13. The protective

function :+ Under or over

frequency.+ Under voltage

(When the voltagelower 60% Vn, the

relay will be locked).14. DC supply Vdc 90 ÷ 240

Note : Tenderer may quotethe relay withoperating voltage of

110Vdc±10% and the

voltage divider to beable to supply theoperating voltage of 220Vdc to the relay.

15. - Settings :+ Over frequency (f1

>)

+ Under frequency (f2<)

* 51 to 55.75 Hzadjustable in stepsof 0.25 Hz.

* 45 to 49.75 Hzadjustable in stepsof 0.25 Hz.

* 0.4s to 4.4s/var/www/apps/conversion/tmp/scratch_4/138238322.doc 3/4

7/28/2019 ro le tan so 81




+ Time delay

+ Under voltage

adjustable in stepsof 0.4s.

* When the voltagelower 60% Vn, therelay will be locked.

16. - Operating time :+ Response time+ Reset time

180ms180ms

17. - Contacts :+ NC+ NO

44

18. - Contact ratings :

+ For 0.2s+ For continuous

30A and 300VDC5A and 300VDC

19. - Mechanical durability :+ Loaded contact+ Unloaded contact

Oper.Oper.

minimum 10.000minimum 100.000

20. - Accuracy :+ Timing circuit+Frequency

measurement+ Immunity to 2nd -

5th harmonics :

+ Blocking on abnormalloss of monitoredvoltage :

± 5

± 0.05Hz5%

0.6Vn±

15%

21. Ambient temp. ° C 0 to 55

22. Humidity % 0 - 95


Documents

ro le tan so 81