Module spare parts SCXI-1121

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 542plus switchbay protection and control unit Manual Part 3: Installation and Commissioning 1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 34 / 80 5 Commissioning The following sections with their subsections contain information on:
The devices and facilities required for the commissioning inspection.
The required procedure for the commissioning inspection; For example, depending on the components to be tested: Protection, interlock conditions, communications, measured value recording and determining the direction. 5.1 Safety Information The devices, adapters and procedures described are only examples. Experience and safety in handling the various devices is a requirement. 5.2 Switching on the feeder Caution Before switching on the feeder check that the REF542plus is fully functional in the corresponding bay. Pay particular attention to the protective functions and the interlocking! 5.3 Test Equipment The most important device for the commissioning of the REF542plus is an appropriate relay test equipment. The test equipment should have a three phase current and voltage system. Also the simulation of current and voltage sensors by the test equipment shall also be possible. For example a test equipment manufactured by KOCOS in Korbach/Germany can be used. 5.4 Testing the interlock conditions, This test is intended to check the interlocking of the switchgear that the user wants and is required. The two types of interlocking must be taken into account here: Bay-level interlocking of specific switchgear and Station-level interlocking of the bay versus other bays. The interlock conditions for the bay under test can be found in the order documentation. The interlock conditions specified by the user can be found there. All possible circumstances must be checked. REF 542plus switchbay protection and control unit Manual Part 3: Installation and Commissioning 1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 35 / 80 5.5 Determining the transformer direction The connection of the measuring inputs and the correct polarity of the current and voltage transformers or sensors is very important for distance, comparison and directional functions. In addition to testing the polarity, the transformation ratio and the magnetizing characteristic, the wiring of the transformers/sensors must also be checked during these test. 5.5.1 Current transformer The transformers must have a positive winding. This can be easily checked with a 9 V battery and an analog DC voltmeter. If the primary coil of the current transformer is connected to the battery, the analog voltmeter connected on the secondary side must show positive. When the battery is disconnected, the voltmeter must measure a negative impulse. The positive terminal of the battery must be connected to P1 of the primary coil and the positive input of the voltmeter to s1 for this test. The same applies for the negative terminal at P2 of the primary coil and the voltmeter negative input at s2 of the secondary coil. The test setup for checking the direction of a core is shown in the following figure. V + – + – P2 P1 1s1 1s2 2s1 2s2 3s1 3s2 Figure 16: Setup for the polarity test of current transformers This polarity check, also referred to as patch test, must be run for every core. To guarantee correct operation even with a multi core current transformer with different cores such as protection and measuring cores, it is recommended that the magnetizing characteristic (hysteresis) be recorded. A Variac with appropriately high voltage is connected to the secondary terminals. The flowing current is measured while the output voltage is rising. The characteristic of the measured values, voltage over current, yields the magnetizing characteristic of the core, which can then be compared with the manufacturer's data. The transformation ratio of the current transformer cores is checked with a special primary current feed device. The feed device is primarily connected to the current transformer and the secondary value is measured at the secondary terminals of the transformer or at the protective cabinet with an ampere meter. REF 542plus switchbay protection and control unit Manual Part 3: Installation and Commissioning 1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 36 / 80 5.5.2 Voltage transformer The same polarity test or patch test is run with voltage transformers. The difference is that the battery is connected to the secondary side and the analog DC test instrument to the primary coil of the voltage transformer. The test setup for checking a core is shown in the following figure. V + – N A a n e n + – Figure 17: Polarity test of voltage transformers Every core must be tested here. If the Variac described in the current transformer section for recording the magnetizing characteristic has a sufficiently high output voltage (e.g. 500 V), it can also be used to run a qualitative test of the voltage transformer transformation ratio. The Variac voltage is applied to the primary side of the voltage transformer and a voltmeter is used to measure the secondary voltage at the corresponding transformer or protective cabinet terminals. 5.5.3 Current sensor Because the current sensor, the Rogowski coil, is an air-core coil, it must be subjected to the same polarity test as the current transformers. The test design is shown in the following diagram. A higher voltage value may be required for the battery. + – P2 P1 V + – S2 S1 Figure 18: Polarity test of current sensors (Rogowski coil) The transformation ratio is tested exactly as with a current transformer. The display in the REF542 protection and control unit can also be checked at the same time. It is not necessary to record a magnetizing characteristic with the Rogowski coil, because it is an air-core coil with no saturation characteristics.