Current transformer automatic switching type winding comprehensive test device
Through the design current transformer automatic switching winding comprehensive test device, the rotating switch and AC contactor can be used to achieve the winding and test items switching, which solves the secondary winding error of the current transformers in the existing technology During the experimental process, the problem of low safety hazards and test efficiency of the test realized the efficient and safe test process.
Patent Information
- Application Number
- CN202420675909.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The prior art has safety hazards and low test efficiency in the secondary winding error, open circuit between turns and excitation curve performance tests of current transformers. Especially when there are too many secondary windings, it is necessary to repeatedly lift and lower current and manually wiring. This results in complex and inefficient testing.
Design a comprehensive test device of an automatic switching winding winding winding winder, a combination of rotating switch and multiple AC contactors to realize the automatic switching of the winding and the short -testing short connection land, and use the interoperability of the AC contactor to achieve it. Switching the test items to simplify the test process.
The test efficiency and security have been improved, the risk of manual wiring is avoided, and a one -time wiring is achieved. There is no need to check the second -time wiring inspection, which significantly improves the test efficiency and safety of secondary winding errors, inter -turning roads and excitation curve performance tests.
Smart Images
Figure CN222420516U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of transformer manufacturing and relates to a comprehensive test device for current transformer error, inter-turn open circuit and excitation performance testing, in particular to a current transformer automatic switching winding comprehensive test device. Background Art
[0002] At present, when conducting current transformer error and inter-turn open circuit tests, the input end of the voltage regulator is connected to a 380V power supply, the output end of the voltage regulator is connected to the input end of a large current booster, the output end of the current booster is connected to the primary side of a standard current transformer and the primary side of a current transformer under test, the secondary side of a standard current transformer and the secondary side of a current transformer under test are connected to a transformer tester, and other non-tested windings are short-circuited to ground. If there are multiple windings in the secondary side, the wiring test of the secondary windings needs to be performed one by one; when conducting a current mutual inductance excitation curve performance test, the input end of the voltage regulator is connected to a 380V power supply, the output end of the voltage regulator is connected to the primary side of a standard voltage transformer, the secondary side of a standard voltage transformer is connected to the secondary winding of the test product, and the primary side voltage of the standard voltage transformer and the secondary current of the standard voltage transformer are monitored; the above operation process has the following deficiencies:
[0003] 1) If the secondary winding of the current transformer is too much, it is necessary to repeatedly increase and decrease the current and manually connect the wires; if the secondary turns of the tested current transformer are open during the test, the secondary of the tested current transformer will induce a high voltage of 4.5kV. If the operation is improper, it will cause damage to the test personnel and the product.
[0004] 2) If there are too many secondary windings, the test efficiency will be greatly reduced. The time will be mainly wasted on checking the wiring, separating the secondary winding leads, and avoiding contact conduction, resulting in low test efficiency. Utility Model Content
[0005] In view of the above-mentioned deficiencies existing in the current transformer secondary winding error, turn-to-turn open circuit, and excitation curve performance test process in the prior art, the technical problem to be solved by the utility model is to provide a current transformer automatic switching winding comprehensive test device which improves test efficiency, has high safety and reliability, is easy to operate, and eliminates safety hazards.
[0006] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a current transformer automatic switching winding comprehensive test device, including: a rotary switch unit, a first AC contactor unit, a second AC contactor unit, a third AC contactor unit, a voltage regulator, and a current booster;
[0007] The rotary switch unit is connected to the first AC contactor unit, the second AC contactor unit, and the third AC contactor unit;
[0008] The first AC contactor unit is connected to the voltage regulator;
[0009] The second AC contactor unit is connected to the secondary side of the current transformer under test, or is connected to the primary side of the reference current transformer and the primary side of the current transformer under test through a current booster;
[0010] The third AC contactor unit is connected to N secondary sides of the current transformer under test.
[0011] The rotary switch unit includes a first rotary switch, a second rotary switch, a third rotary switch, and a fourth rotary switch.
[0012] The first AC contactor unit includes a first AC contactor;
[0013] The coil of the first AC contactor is connected to the power supply through the first rotary switch, the normally open contact of the first AC contactor is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the normally open contact of the second AC contactor.
[0014] The first AC contactor unit includes a second AC contactor;
[0015] The coil of the second AC contactor is connected to the power supply through the second rotary switch, the normally closed contact of the second AC contactor is connected to the power supply through the input open indicator light, and the normally open contact is connected to the power supply through the input closed indicator light; the normally open contact of the second AC contactor is connected to the voltage regulator.
[0016] The first AC contactor unit includes a third AC contactor;
[0017] The coil of the third AC contactor is connected to the power supply through the first switch of the switch closing button FA, and the first switch of the switch closing button FA is connected in parallel with the normally open contact of the second AC contactor; the alarm is connected to the power supply through the second switch of the switch closing button FA.
[0018] The second AC contactor unit includes a plurality of AC contactors;
[0019] The coils of the multiple AC contactors are respectively connected to the power supply via multiple contacts of the third rotary switch;
[0020] When the excitation curve performance test is carried out, the normally open contact of a certain AC contactor is connected to a secondary side of the current transformer under test, and the primary side of the current transformer under test is open.
[0021] When the error open circuit test is performed, the normally open contact of the AC contactor is connected to the input end of the current booster, and the output end of the current booster is connected to the primary side of the reference current transformer and the primary side of the current transformer under test.
[0022] The secondary side of the reference current transformer and the secondary side of the current transformer under test are connected to a transformer tester.
[0023] The third AC contactor unit includes N AC contactors;
[0024] The coils of the N AC contactors are respectively connected to the power supply through the N contacts of the fourth rotary switch;
[0025] The normally closed contact of each AC contactor is connected to N secondary sides of the current transformer under test.
[0026] The utility model has the following beneficial effects and advantages:
[0027] 1. The utility model completes multiple winding switching on the comprehensive test device, is externally connected to a 380V power supply, and has three sets of AC contactors installed in the test device. It is suitable for secondary winding error, turn-to-turn open circuit and excitation curve performance tests of current transformers with up to 9 windings.
[0028] 2. The comprehensive test device is convenient for measuring and wiring the secondary winding of the current transformer and short-circuiting and grounding the non-test winding. At the same time, the interlocking function of the AC contactor is used to realize winding switching and test item switching, so that the test process of secondary winding error, turn-to-turn open circuit and excitation curve performance can be simplified, the overall test safety factor can be improved, personnel safety can be guaranteed, one-time wiring can be achieved, and no secondary wiring inspection is required, which improves the test efficiency of secondary winding error, turn-to-turn open circuit and excitation curve performance test. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1A This is the control circuit diagram 1 in the utility model;
[0030] Figure 1B For the control circuit in the utility model Figure 2 ;
[0031] Figure 2 This is the main circuit diagram of the utility model;
[0032] Figure 3 This is the circuit diagram of the current transformer error and inter-turn open circuit test of the utility model;
[0033] Figure 4 This is the circuit diagram of the excitation curve performance test of the utility model;
[0034] Among them, 1 is AC contactor 2CJ, 2 is AC contactor 3CJ, 3 is alarm bell DL, 4 is AC contactor group (AC contactor 4CJ~6CJ), 5 is AC contactor group (AC contactor ACJ~ICJ), 6 is voltage regulator, 7 is current booster, 8 is transformer calibrator, and 9 is standard voltage transformer. DETAILED DESCRIPTION
[0035] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0036] A current transformer automatic switching winding comprehensive test device, with 380V power supplied from the outside, and the 380V power supply controlled by the rotary switch inside. In order to ensure the safety of the equipment, fuses 1QF and 2QF are installed in the line, and digital voltmeters are installed at both ends of the output. The output line of the voltage regulator passes through the through-type current transformer, and the secondary side of the through-type current transformer is connected to the output ammeter to monitor the output current of the voltage regulator. The rotary switch controls the 380V power supply of the whole set of equipment, and the rotary switch is turned to "closed" to provide power for the whole set of equipment; the test device is equipped with a 9-position rotary switch for winding switching during the test; a total of 3 sets of AC contactors are installed inside the comprehensive test device, of which 1 set has 9 AC contactors ( Figure 1B ACJ-ICJ), using the rotary switch, AC contactor normally closed, normally open contacts to achieve 9 winding interlocking functions, complete the switching of each winding, the rotary switch to achieve non-test winding short-circuit grounding, each winding is connected with an indicator light; 1 set of AC contactor ( Figure 1A 4CJ) completes the error and inter-turn open circuit test; 1 set of AC contactor ( Figure 1A 5CJ-6CJ) complete the excitation curve performance test (including low curve straight test and high curve withstand voltage).
[0037] The connection relationship of this device is as follows:
[0038] like Figure 1A , Figure 1B As shown, the rotary switch includes a rotary switch 1LW1, a rotary switch 2LW1, a rotary switch 3LW1, and a rotary switch 4LW1;
[0039] The coil of the AC contactor 1CJ is connected to the power supply through the rotary switch 1LW1, the normally open contact of the AC contactor 1CJ is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the normally open contact of the AC contactor 2CJ;
[0040] The coil of AC contactor 2CJ is connected to the power supply through rotary switch 2LW1, the normally closed contact of AC contactor 2CJ is connected to the power supply through the input open indicator light, and the normally open contact is connected to the power supply through the input close indicator light; the normally open contact of AC contactor 2CJ is connected to the voltage regulator;
[0041] The coil of the AC contactor 3CJ is connected to the power supply through the first contact of the switch closing button FA, and the first contact of the switch closing button FA is connected in parallel with the normally open contact of the AC contactor 2CJ; the alarm is connected to the power supply through the second contact of the switch closing button FA.
[0042] The coils of AC contactors 4CJ to 7CJ are connected to the power supply through multiple contacts of rotary switch 3LW1;
[0043] The coils of the AC contactors ACJ to ICJ are connected to the power supply through the 9 groups of contacts of the rotary switch 4LW1 respectively; the normally closed contact of each AC contactor is connected to the 9 secondary sides of the current transformer under test.
[0044] like Figure 2 to Figure 4 As shown, when the excitation curve performance test is carried out, the normally open contact of the corresponding AC contactor (such as 5CJ or 6CJ) is connected to the corresponding secondary side of the current transformer under test, and the primary side of the current transformer under test can be opened by manually removing the measuring wires at both ends of the primary side of the current transformer under test.
[0045] When the error open circuit test is in progress, the normally open contact of the corresponding AC contactor (such as 4CJ) is connected to the input of the current booster, and the output of the current booster is connected to the primary side of the standard current transformer and the primary side of the current transformer under test. The secondary side of the standard current transformer and the secondary side of the current transformer under test are connected to the transformer tester.
[0046] Among them, the AC contactor adopts CJX2-25 type AC contactor.
[0047] A current transformer automatic switching winding comprehensive test device, such as Figure 1A-1B As shown in the figure, it is the core part of the comprehensive test device, which consists of a rotary switch and 3 sets of AC contactors working together. The contactor interlocking function is used to realize automatic switching of windings, short-circuit grounding of non-test windings, and switching of test items.
[0048] To start the test, first turn on the power switch. Figure 1A 1CJ, provide 380V power to the test device, the power supply voltage meter pointer shows 380V, close the input switch of the voltage regulator ( Figure 1A 2CJ contactor), the voltage regulator input voltage meter shows 380V, press Figure 1A DL alarm bell, Figure 1A The 3CJ contactor is closed, and the voltage regulator output is closed; the rotary switch is used in conjunction with the AC contactor to realize the test function interlock, and the rotary switch diagram Figure 1A In 4CJ-6CJ, select the required test items (winding error and inter-turn open circuit or excitation curve performance test); rotating winding switch control Figure 1A Among the AC contactors ACJ~ICJ, any one of the normally closed contactors becomes normally open, and the other non-test winding contactors remain closed to ensure that the non-test winding is short-circuited to ground, and so on, to achieve automatic winding switching test.
[0049] like Figure 2 to Figure 4As shown, during the error and open circuit test, the project conversion switch is turned to the error and open circuit test project. Figure 1A When the 4CJ contactor is closed, the voltage regulator 6 starts to increase the current, and the output current flows to the current booster 7. The transformer tester 8 monitors the test current of the tested winding. If the test current ( Figure 3 If the current of the transformer tester 8) suddenly drops to 0A, it means that the secondary winding of the product has an open circuit between turns. Press the alarm immediately ( Figure 1A The DL alarm 3) of the voltage regulator output contactor 3CJ is automatically disconnected to ensure the safety of personnel and equipment, and then the secondary winding is short-circuited and discharged with the grounding wire.
[0050] During the excitation curve performance test, the project conversion switch is turned to the low curve or high curve test project. Figure 1A Contactor 5CJ or 6CJ is closed, and voltage regulator 6 starts to boost the voltage, and the output voltage reaches Figure 4 The primary winding of the standard voltage transformer 9 in the test is connected to the secondary winding of the test product. The voltmeter monitors the voltage of the standard voltage transformer and the ammeter monitors the secondary winding current of the test product.
[0051] After all tests are completed, press the alarm 3 ( Figure 1A DL), the voltage regulator output 3CJ contactor automatically disconnects, and the voltage regulator input switch 2LW1 is turned off. Figure 1A The 2CJ contactor is disconnected, the power switch is turned off, and the test is completed.
Claims
1. A current transformer automatic switching winding comprehensive test device, characterized in that: include: A rotary switch unit, a first AC contactor unit, a second AC contactor unit, a third AC contactor unit, a voltage regulator, and a current booster; The rotary switch unit is connected to the first AC contactor unit, the second AC contactor unit, and the third AC contactor unit; The first AC contactor unit is connected to the voltage regulator; The second AC contactor unit is connected to the secondary side of the current transformer under test, or is connected to the primary side of the reference current transformer and the primary side of the current transformer under test through a current booster; The third AC contactor unit is connected to N secondary sides of the current transformer under test.
2. A current transformer automatic switching winding comprehensive test device according to claim 1, characterized in that: The rotary switch unit includes a first rotary switch, a second rotary switch, a third rotary switch, and a fourth rotary switch.
3. The current transformer automatic switching winding comprehensive test device according to claim 1 is characterized in that: The first AC contactor unit includes a first AC contactor; The coil of the first AC contactor is connected to the power supply through the first rotary switch, the normally open contact of the first AC contactor is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the normally open contact of the second AC contactor.
4. The current transformer automatic switching winding comprehensive test device according to claim 1 is characterized in that: The first AC contactor unit includes a second AC contactor; The coil of the second AC contactor is connected to the power supply through the second rotary switch, the normally closed contact of the second AC contactor is connected to the power supply through the input open indicator light, and the normally open contact is connected to the power supply through the input close indicator light; The normally open contact of the second AC contactor is connected to the voltage regulator.
5. The current transformer automatic switching winding comprehensive test device according to claim 1, characterized in that: The first AC contactor unit includes a third AC contactor; The coil of the third AC contactor is connected to the power supply through the first switch of the switch closing button FA, and the first switch of the switch closing button FA is connected in parallel with the normally open contact of the second AC contactor; the alarm is connected to the power supply through the second switch of the switch closing button FA.
6. A current transformer automatic switching winding comprehensive test device according to claim 1, characterized in that: The second AC contactor unit includes a plurality of AC contactors; The coils of the multiple AC contactors are respectively connected to the power supply via multiple contacts of the third rotary switch; When the excitation curve performance test is carried out, the normally open contact of a certain AC contactor is connected to a secondary side of the current transformer under test, and the primary side of the current transformer under test is open.
7. A current transformer automatic switching winding comprehensive test device according to claim 6, characterized in that: When the error open circuit test is performed, the normally open contact of the AC contactor is connected to the input end of the current booster, and the output end of the current booster is connected to the primary side of the reference current transformer and the primary side of the current transformer under test.
8. A current transformer automatic switching winding comprehensive test device according to claim 7, characterized in that: The secondary side of the reference current transformer and the secondary side of the current transformer under test are connected to a transformer tester.
9. The current transformer automatic switching winding comprehensive test device according to claim 1, characterized in that: The third AC contactor unit includes N AC contactors; The coils of the N AC contactors are respectively connected to the power supply through the N contacts of the fourth rotary switch; The normally closed contact of each AC contactor is connected to N secondary sides of the current transformer under test.