Electrical Testing And Commissioning Companies In Singapore
New Commissioning engineer Jobs in Singapore available today on JobStreet - Quality Candidates, Quality Employers, 65001 vacancies. In the overall process of ensuring that the design and development of multi-disciplinary interfaces among the different electrical and mechanical systems are compatible with the overall performance requirement. Testing and commissioning Power-Tech Engineers has extensive experience in the testing of electrical systems and equipment in electrical utility facilities, including all types of generating stations, substations (e.g. Receiving, distribution, etc.), as well as converter stations. We are one of the renowned electrical contracting companies based at Singapore. Led by an efficient management team and helped by skilled and empowered workers, we are a dedicated group offering diversified services like Electrical Construction, Data centers construction and installation of electrical devices and cables.Our management team has a far sighted vision that will carry the company.
Hurricane Irene effects felt at Jets-Giants gameBy yahooirenesignbrbrEAST RUTHERFORD, N.J. ȵrricane Irene huffed and puffed only couldn't bring MetLife Stadium down.brbrThe first football game following MetLife's for naming rights as the facility formerly known as The New Meadowlands Stadium was finally played aboard Monday night between the Giants and the Jets - two days behind the aboriginal schedule meeting The Category 1 Irene forced the originally scheduled 7 p.m.begin this past Saturday night to be pushed up to 2 p.m. That same afternoon. Then on Friday evening,either the Giants and Jets along with the NFL decided to movement it safe and reschedule the game for Monday night.brbrThe entire tri-state region was a muddle with record rainfall and winds wreaking erasure As of Monday morning 1 estimated 900,000 among New Jersey were still without power and some regions were never expecting to be behind aboard the grid until the annihilate of the week. In truth the Atlantic Health Jets Training Center among Florham Park, N.J.is currently without power and forever happening operations have been moved to MetLife Stadium, which either the Giants and Jets share, until power is restored.brbrBecause the game was originally scheduled as Saturday night afterwards was afterward moved up?to early afternoon to avert Irene, the Jets ended up staying among their crew hostel aboard Saturday and Sunday nights.Company ProfileRotary Switchgear & Testing Pte. Ltd (RST) was established in 1982.
We specialized in engineering, installation, maintenance, Testing & Commissioning of Electrical Equipments range from Medium Voltage to High voltage.Our well qualified and experienced Managers and Engineers with many years of field experience are always ready to response and provide effective solutions to our customers’ needs. With the support from our dedicated, efficient and well disciplined work force, we strive to fulfill our commitments with good quality works and timely delivery.
Protection relay self-test procedureDigital and numerical relays will have a self-test procedure that is detailed in the appropriate relay manual. These tests should be followed to determine if the relay is operating correctly.This will normally involve checking of the relay watchdog circuit, exercising all digital inputs and outputs and checking that the relay analogue inputs are within calibration by applying a test current or voltage.For these tests, the relay outputs are normally disconnected from the remainder of the protection scheme, as it is a test carried out to prove correct relay, rather than scheme, operation. To shorten testing and commissioning times of SIPROTEC relays, extensive test and diagnostic functions are available to the user in DIGSI 5. Unit protection schemes involve relays that need to communicate with each other. This leads to additional testing requirements. The communications path between the relays is tested using suitable equipment to ensure that the path is complete and that the received signal strength is within specification. Numerical relays may be fitted with loopback test facilities that enable either part of or the entire communications link to be tested from one end.After completion of these tests, it is usual to enter the relay settings required.
This can be done manually via the relay front panel controls, or using a portable PC and suitable software.Whichever, method is used, a check by a second person that the correct settings have been used is desirable, and the settings recorded. Programmable scheme logic that is required is also entered at this stage. SIPROTEC relay wiring test editor for monitoring and testing of binary inputs, binary outputs and LED (click to expand)Current transformer testsThe following tests are normally carried out: checking of polarity and current transformer magnetisation curve.Polarity checkEach current transformer should be individually tested to verify that the primary and secondary polarity markings are correct (see Figure 1).The ammeter connected to the secondary of the current transformer should be a robust moving coil, permanent magnet, centre-zero type. A low voltage battery is used, via a single-pole push-button switch, to energise the primary winding. On closing the push-button, the DC ammeter, A, should give a positive flick and on opening, a negative flick.
Figure 1 – Current transformer polarity checkChecking of magnetisation curveSeveral points should be checked on each current transformer magnetisation curve. This can be done by energising the secondary winding from the local mains supply through a variable auto-transformer while the primary circuit remains open. See Figure 2. It is often found that current transformers with secondary ratings of 1A or less have a knee-point voltage higher than the local mains supply. In these cases, a step-up interposing transformer must be used to obtain the necessary voltage to check the magnetisation curve.Voltage transformer testsVoltage transformers require testing for polarity, ratio and phasing.Polarity check of voltage transformerThe voltage transformer polarity can be checked using the method for CT polarity tests. Care must be taken to connect the battery supply to the primary winding, with the polarity ammeter connected to the secondary winding. If the voltage transformer is of the capacitor type, then the polarity of the transformer at the bottom of the capacitor stack should be checked.Ratio check of VTThis check can be carried out when the main circuit is first made live. The voltage transformer secondary voltage is compared with the secondary voltage shown on the nameplate.
Namplate of a single phase voltage transformer (photo credit: emadrlc.blogspot.com)Phasing check of VTThe secondary connections for a three-phase voltage transformer or a bank of three single-phase voltage transformers must be carefully checked for phasing. With the main circuit alive, the phase rotation is checked using a phase rotation meter connected across the three phases, as shown in Figure 3 below.Provided an existing proven VT is available on the same, and that secondary earthing is employed, all that is now necessary to prove correct phasing is a voltage check between, say, both ‘A’ phase secondary outputs. There should be nominally little or no voltage if the phasing is correct.
However, this test does not detect if the phase sequence is correct, but the phases are displaced by 120o from their correct position, i.e. Phase A occupies the position of phase C or phase B in Figure 3.This can be checked by removing the fuses from phases B and C (say) and measuring the phase-earth voltages on the secondary of the VT. If the phasing is correct, only phase A should be healthy, phases B and C should have only a small residual voltage. Figure 3 – Voltage transformer phasing checkCorrect phasing should be further substantiated when carrying out ‘on load’ tests on any phase-angle sensitive relays, at the relay terminals. Load current in a known phase CT secondary should be compared with the associated phase to neutral VT secondary voltage.The phase angle between them should be measured, and should relate to the power factor of the system load.If the three-phase voltage transformer has a broken-delta tertiary winding, then a check should be made of the voltage across the two connections from the broken delta VN and VL, as shown in Figure 3 above.
Nfl street 3 rosters. With the rated balanced three- phase supply voltage applied to the voltage transformer primary windings, the broken-delta voltage should be below 5V with the rated burden connected.Protection relay setting checks (alarm and trip settings)At some point during commissioning, the alarm and trip settings of the relay elements involved will require to be entered and/or checked. Where the complete scheme is engineered and supplied by a single contractor, the settings may already have been entered prior to despatch from the factory, and hence this need not be repeated.The method of entering settings varies according to the relay technology used. For, manual entry of the settings for each relay element is required. This method can also be used for digital/numerical relays.
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However, the amount of data to be entered is much greater, and therefore it is usual to use appropriate software, normally supplied by the manufacturer, for this purpose. The software also makes the essential task of making a record of the data entered much easier.Once the data has been entered, it should be checked for compliance with the recommended settings as calculated from the protection setting study. Where appropriate software is used for data entry, the checks can be considered complete if the data is checked prior to download of the settings to the relay.Otherwise, a check may required subsequent to data entry by inspection and recording of the relay settings, or it may be considered adequate to do this at the time of data entry. The recorded settings form an essential part of the commissioning documentation provided to the client.Resource // Network protection and automation guide – Areva.