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Active transformer capacity characteristic tester use method:
The following will be divided into two parts: active capacity load loss, passive loss measurement section.
(a). Active transformer capacity, load loss measurement section
1. Basic concepts
Active capacity test: Through some necessary data to determine the actual capacity value of a transformer; thus check whether the transformer nameplate capacity tested is true.
2. Test methods
The capacity tester is equipped with three test clamps (yellow, green, and red), each of which draws two test wires, one thick wire and one thin wire, and the thick wire is connected to the current of the corresponding color of the capacity test terminal on the instrument panel. Terminals (Ia, Ib, Ic), thin wires are connected to voltage terminals (Ua, Ub, Uc) corresponding to the capacity test terminals on the instrument panel, and the clamp heads are clamped to the high voltage side terminals of the tested transformer respectively. Above, the low side of the transformer should be shorted with a dedicated short wire. After the cable is connected, select the capacity test item on the main screen. At this time, enter the capacity parameter setting screen and set it as follows:
Set the current temperature, use the up and down keys to point the hand-type pointer to the 'current temperature' option, use the left and right keys to adjust the temperature value, as far as possible to be accurate, *** good thermometer indication.
Set the high voltage side rated voltage, press the up and down arrow keys to point to the 'high voltage rating' option, and use the left and right arrow keys to adjust the high rated voltage range. For example, if the tested transformer is a 10KV/400V distribution transformer, set this item to 10KV.
Set the transformer type. Use the up and down keys to point the hand pointer to the 'Transformer type' option. Use the left and right arrow keys to adjust this option to match the nameplate.
Set the tap position. Use the up and down arrow keys to move the hand pointer to the “Tap position†option. Use the left and right arrow keys to adjust this option. Usually tap the tap to the 2 tap position, in case the transformer under test is tapped at other points. Position, set this option to the correct position.
Use the up and down keys to point the hand pointer to the item number to be tested, and use the left and right arrow keys to adjust the option to a certain number.
Press the start key to test, the result is automatically retained on the LCD
Select 'Save' to save the result to the internal memory. If you do not need to save, do not select this item.
Select 'Print' to print out the test results.
The wiring method of the active load test is exactly the same as the capacity test, and the operation is also simple. It is worth noting that the parameter setting of the active load test is to use the third parameter setting in the main interface, which must be set correctly.
(B) Passive transformer loss measurement section
1. Basic concepts
No-load test: A rated voltage of rated frequency of a sine wave is applied from one winding of the transformer (usually from the secondary low-voltage side), and the remaining windings are opened, and the no-load current and no-load loss are measured. If the test conditions are limited and the power supply voltage fails to reach the rated voltage, it can be tested under non-rated voltage conditions. This type of test method has a large error and is generally only used to check whether the transformer is faulty. Only the test voltage reaches over 80% of the rated voltage. Can be used to test the no-load loss.
Short-circuit test: Connect the low-voltage and high-current side of the transformer manually and short-circuit the test voltage of the rated frequency from the rated tap of the high-voltage side coil to make the current in the winding reach the rated value, and then measure the input power and the applied voltage ( The short-circuit loss and short-circuit voltage) and the current value.
2. Test methods
According to different test items, the following are introduced separately:
(1).Single-phase power supply measurement against no-load loss of three-phase transformer: When field test conditions cannot meet the requirement of no-load test with three-phase power supply, single-phase power supply (AC 220V) can be used for no-load test of three-phase transformer. . Each phase of the transformer pressure test, the test results are automatically converted to the three-phase power test.
Using Ua, Ub of the instrument to measure the voltage, measuring the current with the A-phase current loop, the active transformer capacity characteristic tester powers the low-voltage sides Ao, Bo, and Co of the transformer under test in sequence.
Measurement of no-load loss of three-phase transformer by single-phase method
When the on-site power failure can not provide the three-phase power used in the no-load test, the single-phase method can be used to measure the no-load loss of the three-phase transformer. The measurement method is as follows:
A single-phase ~220V AC power supply was used for the single-phase no-load test of the A, B and C phases of the transformer. When entering the parameter setting interface, input the measured transformer capacity value in the transformer capacity: status bar, in the high rated voltage:, the low rated voltage: and the wiring method: status bar, input according to the value marked on the nameplate.
When the A phase is unloaded, clamp the yellow test pliers to the a phase terminal on the low voltage side of the transformer, and clamp the red test pliers on the common side of the low voltage side of the transformer; test the caliper to obtain the thick wire and connect it according to the wiring diagram (coarse wire current , thin wire then voltage). After the wiring is correct, switch on the single-phase ~220V AC power supply. After the value is stable, press the "OK" key. This completes the phase a test. Note: After completing the phase a test, you must disconnect the ~220V AC power supply and then perform the commutation test (you must disconnect the power supply after each phase of the test).
When the B phase is unloaded, clamp the yellow test pliers to the b phase terminal on the low side of the transformer, and clamp the red test pliers to the common terminal on the low side of the transformer.
When doing C-phase idling, clamp the yellow test pliers to the c-phase terminal on the low side of the transformer and clamp the red test pliers to the common terminal on the low side of the transformer.