CN209979826U - Testing device of distribution transformer - Google Patents
Testing device of distribution transformer Download PDFInfo
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- CN209979826U CN209979826U CN201920515319.6U CN201920515319U CN209979826U CN 209979826 U CN209979826 U CN 209979826U CN 201920515319 U CN201920515319 U CN 201920515319U CN 209979826 U CN209979826 U CN 209979826U
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Abstract
The utility model relates to a distribution transformer's test device for the no-load test and the load test of the transformer that awaits measuring carry out remote control and automatic switch-over, including three-phase power, power switching device, three-phase voltage regulator, secondary winding switching device, first empty load tester, the transformer that awaits measuring, second empty load tester, primary winding switching device that electricity connects in proper order; one end of the primary winding switching device is connected with the second empty load tester, and the other end of the primary winding switching device is connected with the secondary of the three-phase voltage regulator; the transformer secondary winding to be tested is also connected with a short-circuit device in parallel, a switching power supply and a controller are further arranged at the output end of the three-phase power supply, the switching power supply secondary provides a low-voltage direct-current power supply, and the controller controls a power supply switching device, a secondary winding switching device, the short-circuit device and a primary winding switching device to provide power supply switching so as to switch over no-load test and load test items. The utility model discloses save equipment quantity, improved efficiency of software testing, reduced operating personnel intensity of labour.
Description
Technical Field
The utility model relates to a distribution transformer test field, concretely relates to distribution transformer's test device.
Background
At present, a three-phase transformer is generally adopted in a distribution network in China to realize the conversion and the transmission of electric energy, and most of testing devices of the transformer in the market can only realize the testing project of the three-phase transformer. With the rapid development of distribution networks in China, a certain amount of single-phase small-capacity transformers are still reserved in the market aiming at remote mountain areas and rural areas and considering the actual condition of power consumption of users, and for the test of the single-phase transformers, proper test devices need to be researched to complete test projects required by test procedures, particularly a centralized integrated test system planned based on the existing distribution network material sampling inspection center, and the test device which can realize the test of the three-phase transformers and the single-phase transformers and integrates multiple test functions is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem who exists among the prior art, provide a distribution transformer's test device, can realize that automatic switch-over wiring carries out no-load test or load test, also can realize testing three-phase transformer in same device, also can test single-phase transformer, saved equipment quantity, improved efficiency of software testing, reduced the intensity of labour that operating personnel frequently connect the trade line.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a testing device of a distribution transformer is used for carrying out remote control and automatic switching on no-load test and load test of a transformer to be tested, and comprises a three-phase power supply, a power supply switching device, a three-phase voltage regulator, a secondary winding switching device, a first no-load tester, the transformer to be tested, a second no-load tester and a primary winding switching device which are sequentially and electrically connected,
a first end of the power switching device is connected to the three-phase power supply, and a second end of the power switching device is connected to a primary side of the three-phase voltage regulator;
the secondary side of the three-phase voltage regulator is connected with a first end of a secondary winding switching device, a second end of the secondary winding switching device is connected with a current input end of the first empty load tester, a voltage measuring end of the first empty load tester is in short circuit with a current output end of the first empty load tester, and the current output end of the first empty load tester is connected with a secondary winding of the transformer to be tested;
the primary winding of the transformer to be tested is connected with the current output end of the second empty load tester, the voltage measuring end of the second empty load tester is in short circuit with the current output end of the second empty load tester, the current input end of the second empty load tester is connected with the second end of the primary winding switching device, and the first end of the primary winding switching device is connected with the secondary side of the three-phase voltage regulator;
the transformer to be tested is characterized by further comprising a short-circuit device, wherein the first end of the short-circuit device is connected with the secondary winding of the transformer to be tested, and the second end of the short-circuit device is in short circuit;
the switching power supply primary side is connected with any two phases of the three-phase power supply, and the switching power supply secondary side is respectively and electrically connected with the controller, the power supply switching device, the secondary winding switching device, the short-circuit device and the primary winding switching device; the controller is in signal connection with the power switching device control end, the secondary winding switching device control end, the short-circuit device control end and the primary winding switching device control end respectively.
Preferably, the power switching device, the secondary winding switching device, the short-circuit device and the primary winding switching device are all of a three-pole single-throw normally-open structure.
Preferably, when a no-load test is performed, the controller controls the power switching device and the secondary winding switching device to be closed respectively.
Preferably, when a load test is performed, the controller controls the power switching device, the short-circuit device and the primary winding switching device to be closed respectively.
Preferably, when the transformer to be tested is a three-phase transformer, the current output end of the first empty load tester is respectively connected with the a phase, the B phase and the C phase of the secondary winding of the three-phase transformer, and the current output end of the second empty load tester is respectively connected with the a phase, the B phase and the C phase of the primary winding of the three-phase transformer.
Preferably, when the transformer to be tested is a single-phase transformer, any two phases of the three-phase power supply are taken as a single-phase power supply, the first empty load tester current output end is respectively connected with the a end and the X end of the secondary winding of the three-phase transformer, and the second empty load tester current output end is respectively connected with the a end and the X end of the primary winding of the three-phase transformer.
The utility model has the advantages that: because the transformer test project generally adopts a three-phase test power supply, and the three-phase test power supply can operate in a three-phase unbalanced mode, the device realizes the purpose of providing a single-phase test power supply by using the three-phase test power supply, not only can the three-phase transformer be tested, but also the single-phase transformer can be tested in the same device, and the equipment quantity is saved; distribution transformer wiring is heavier, and operating personnel is big at the in-process intensity of labour of frequent wiring, thereby this device has reduced operating personnel and has connect the line frequency of trading through automatic tangent line switching test item, has improved efficiency of software testing, has reduced operating personnel intensity of labour.
Drawings
FIG. 1 is a wiring diagram for testing a three-phase transformer of the present invention;
FIG. 2 is a control schematic diagram of the present invention;
FIG. 3 is a wiring diagram for testing the single-phase transformer of the present invention;
FIG. 4 is a double-meter wiring diagram of the empty load tester of the present invention;
fig. 5 is a three-meter method wiring diagram of the empty load tester of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a power supply switching device, 2, a secondary winding switching device, 3, a short-circuit device, 4, a primary winding switching device, 5, a three-phase power supply, 6, a switching power supply, 7, a three-phase voltage regulator, 8, a three-phase transformer, 9, a controller, 10, a first empty load tester, 11, a second empty load tester, 12 and a single-phase transformer.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a testing apparatus for a distribution transformer is used for performing remote control and automatic switching on a no-load test and a load test of a transformer to be tested, and includes a three-phase power supply 5, a power switching device 1, a three-phase voltage regulator 7, a secondary winding switching device 2, a first no-load tester 10, the transformer to be tested, a second no-load tester 11, and a primary winding switching device 4, which are electrically connected in sequence, where the no-load tester may adopt the prior art (for example, model JHRL-VI). When the test power supply is a three-phase three-wire system, a no-load tester with internal pre-connection of double-meter method connection (namely double watt connection) is adopted, and the connection mode is shown in figure 4; when the three-phase power supply is in a three-phase four-wire system, an idle load tester with an internal pre-connection method of three meters is adopted, and the wiring mode is shown in figure 5. The present embodiment is described by taking a three-phase three-wire system power supply as an example.
A first end of the power switching device 1 is connected to the three-phase power supply 5, and a second end of the power switching device 1 is connected to a primary side of the three-phase voltage regulator 7;
the secondary side of the three-phase voltage regulator 7 is connected with a first end of a secondary winding switching device 2, a second end of the secondary winding switching device 2 is connected with a current input end of a first empty load tester 10, a voltage measuring end of the first empty load tester 10 is in short circuit with a current output end of the first empty load tester 10, and a current output end of the first empty load tester 10 is connected with a secondary winding of the transformer to be tested.
More specifically, the second end of the secondary winding switching device 2 is connected to the current input ends Ia1, Ib1, and Ic1 of the first empty load tester 10, the voltage measurement end Ua of the first empty load tester 10 is short-circuited to the current output end Ia2 of the first empty load tester 10, the voltage measurement end Ub of the first empty load tester 10 is short-circuited to the current output end Ib2 of the first empty load tester 10, and the voltage measurement end Uc of the first empty load tester 10 is short-circuited to the current output end Ic2 of the first empty load tester 10. As shown in fig. 1, when the transformer to be tested is a three-phase transformer 8, the current output terminals Ia2, Ib2, and Ic2 of the first empty load tester 10 are respectively connected to the secondary a-phase winding, b-phase winding, and c-phase winding of the three-phase transformer 8; as shown in fig. 3, when the transformer to be tested is a single-phase transformer 12, the current output terminals Ia2 and Ib2 of the first empty load tester 10 are respectively and correspondingly connected to the secondary a end and the x end of the single-phase transformer 12, which is equivalent to that the a end of the single-phase transformer 12 is connected to a single-phase power L line, the x end of the single-phase transformer 12 is connected to a single-phase power N line, and the current output terminal Ic2 of the first empty load tester 10 is suspended.
The primary winding of the transformer to be tested is connected with the current output end of the second air load tester 11, the voltage measuring end of the second air load tester 11 is in short circuit with the current output end of the second air load tester 11, the current input end of the second air load tester 11 is connected with the second end of the primary winding switching device 4, and the first end of the primary winding switching device 4 is connected with the secondary side of the three-phase voltage regulator 7;
more specifically, as shown in fig. 1, when the transformer to be tested is a three-phase transformer 8, a primary phase a winding, a phase B winding, and a phase C winding of the three-phase transformer 8 are respectively connected to the current output terminals Ia2, Ib2, and Ic2 of the second empty load tester 11. As shown in fig. 3, when the transformer to be tested is the single-phase transformer 12, the primary a end and the X end of the single-phase transformer 12 are respectively and correspondingly connected to the current output ends Ia2 and Ib2 of the second empty load tester 11, which is equivalent to that the primary a end of the single-phase transformer 12 is connected to the single-phase power L line, the primary X end of the single-phase transformer 12 is connected to the single-phase power N line, and the current output end Ic2 of the second empty load tester 11 is suspended. 11 voltage measurement end Ua short circuit of second empty load tester 11 current output terminal Ia2 of second empty load tester, 11 voltage measurement end Ub short circuit of second empty load tester 11 current output terminal Ib2 of second empty load tester, 11 voltage measurement end Uc short circuit of second empty load tester 11 current output terminal Ic2 of second empty load tester, 11 current input terminal Ia1, Ib1, Ic1 of second empty load tester correspond the connection point of connecting 4 second ends of primary winding switching device respectively, 4 first ends of primary winding switching device are connected 7 secondary sides of three-phase voltage regulator.
This embodiment still includes short circuit device 3, short circuit device 3 first end is connected respectively secondary a phase winding, b phase winding, the c phase winding of the transformer that awaits measuring, short circuit device 3 second end short circuit.
The power supply further comprises a switching power supply 6 and a controller 9, wherein a primary side of the switching power supply 6 is connected with any two phases of the three-phase power supply 5, a secondary side of the switching power supply 6 outputs low-voltage direct current, and a secondary side of the switching power supply 6 is used as a direct current power supply and is respectively and electrically connected with a power supply input end of the controller 9, a control end of the power supply switching device 1, a control end of the secondary winding switching device 2, a control end of the short-circuit device 3 and a control end of the primary winding switching device 4; the controller 9 is in signal connection with the control end of the power switching device 1, the control end of the secondary winding switching device 2, the control end of the short-circuit device 3 and the control end of the primary winding switching device 4 respectively.
Preferably, the power switching device 1, the secondary winding switching device 2, the short-circuit device 3, and the primary winding switching device 4 are all of a three-pole single-throw normally-open structure, in this embodiment, three-pole single-throw relays KM1 to KM4 are adopted for implementation, the power switching device 1 corresponds to the relay KM1, the secondary winding switching device 2 corresponds to the relay KM2, the short-circuit device 3 corresponds to the relay KM3, and the primary winding switching device 4 corresponds to the relay KM 4. When each output end of the controller 9 provides a control signal to the corresponding control end of the power switching device 1 (i.e., the coil of the relay KM 1), the control end of the secondary winding switching device 2 (i.e., the coil of the relay KM 2), the control end of the short-circuit device 3 (i.e., the coil of the relay KM 3), and the control end of the primary winding switching device 4 (i.e., the coil of the relay KM 4), the normally open contacts of the corresponding power switching device 1, the corresponding secondary winding switching device 2, the short-circuit device 3, and the corresponding primary winding switching device 4 are closed, and the corresponding test circuit is turned on.
When a no-load test is performed, the controller 9 controls the power switching device 1 and the secondary winding switching device 2 to be closed respectively. Correspondingly, when the relay KM1 and the relay KM2 are closed, the relay KM3 and the relay KM4 are open, namely, the primary winding of the transformer to be tested is open, and the secondary winding of the transformer to be tested and the first empty load tester 10 are connected to a power supply and put into an empty test. The first empty load tester 10 is internally wired by a double-meter method (the wiring method is shown in fig. 4), and can measure the empty load loss of the transformer to be tested.
When a load test is performed, the controller 9 controls the power switching device 1, the short-circuit device 3 and the primary winding switching device 4 to be closed respectively. Correspondingly, when the relay KM1, the relay KM3 and the relay KM4 are closed, the relay KM2 is open, namely, the secondary winding of the transformer to be tested is short-circuited, and the primary winding of the transformer to be tested and the second empty load tester 11 are connected to a power supply and put into a load test. The second empty load tester 11 is internally connected with a double-meter method (the connection method refers to fig. 4), and can measure the empty load loss of the transformer to be tested.
The embodiment can also be provided with an upper computer which is in signal connection with the controller 9, the first empty load tester 10 and the second empty load tester 11, so that man-machine interaction can be realized on the upper computer, test item switching operation and parameter setting are carried out on the controller 9, and data measured by the first empty load tester 10 and the second empty load tester 11 can also be stored on the upper computer and better displayed in the modes of pictures and texts and the like.
The controller 9 can be realized by a PLC or a single chip microcomputer, and if the controller is realized by the PLC, the secondary side of the switching power supply 6 provides +24V voltage; if the single-chip microcomputer is adopted for realization, the secondary side of the switching power supply 6 provides +5V voltage, and the single-chip microcomputer (model STC89C52) is adopted for realization in the embodiment. As shown in fig. 2, the P2.7 output end of the single chip is connected to the base of the transistor VT1, the secondary of the switching power supply 6 is connected to the collector of the transistor VT1 to provide +5V voltage to the collector, the emitter of the transistor VT1 is connected in series with the coil of the relay KM1 and then grounded, and the coil of the relay KM1 is connected in parallel with a reverse biased diode D1 to form an electronic switch driving circuit. Diode D1 functions here to protect transistor VT 1. When the current flowing through the coil of the relay KM1 was changed, the coil of the relay KM1 generated a self-excited voltage to suppress the change of the current, and the faster the change of the current in the coil of the relay KM1 was, the higher the generated voltage was. At the moment when the relay KM1 was turned on and off, due to the inductive nature of the coil, an instantaneous voltage spike was instantaneously generated at the low voltage end of the coil of the relay KM1, which is typically up to tens of times the rated operating voltage of the coil. When the transistor VT1 is turned off from on, the current flowing through the coil of the relay KM1 will decrease rapidly, and at this time, the coil will generate a high self-induced electromotive force which is superimposed with the secondary power voltage from the switching power supply 6 and then applied between the emitter and the collector of the transistor VT1, so that the transistor VT1 will break down. After the diode D1 is connected in parallel, the self-induced electromotive force of the coil can be clamped at the forward conduction voltage of the diode D1, the value is about 0.7V for a silicon tube and about 0.2V for a germanium tube, and therefore breakdown of driving components such as a triode VT1 is avoided. The diode D1 is connected in parallel, it should be noted that the polarity of the diode D1 is not reversed, otherwise the transistor VT1 is easily damaged. At the moment of power failure of the coil of the relay KM1, the coil can generate an inverse peak voltage which is more than 30 times higher than the rated working voltage value of the coil, so that the electronic circuit is greatly damaged, and the inverse peak voltage is usually suppressed by adopting a method of connecting a transient suppression (also called peak clipping) diode or a resistor in parallel so as to be not more than 50V.
When the P2.7 output end of the single chip microcomputer provides a positive voltage signal for the base electrode of the triode VT1, the triode VT1 is conducted, current flows to the emitter electrode of the triode VT1, the current flows to the ground through the coil of the relay KM1, so that the coil of the relay KM1 is electrified, the three normally open contacts of the relay KM1 are attracted, and the three-phase power supply 5 is switched into a test circuit. The control principle of the relay KM2, the relay KM3 and the relay KM4 is the same as that of the relay KM1, the P2.6 output end of the single chip microcomputer controls the relay KM2, the P2.5 output end of the single chip microcomputer controls the relay KM3 and the P2.4 output end of the single chip microcomputer controls the relay KM4, the breakover of the triode is controlled through the single chip microcomputer, the relay coil is electrified, the normally open contact of the relay is attracted, and the corresponding circuit of the test circuit is switched on.
Because the transformer test project generally adopts a three-phase test power supply, and the three-phase test power supply can operate in a three-phase unbalanced mode, the device realizes the purpose of providing a single-phase test power supply by using the three-phase test power supply, not only can the three-phase transformer be tested, but also the single-phase transformer can be tested in the same device, and the equipment quantity is saved; distribution transformer wiring is heavier, and operating personnel is big at the in-process intensity of labour of frequent wiring, thereby this device has reduced operating personnel and has connect the line frequency of trading through automatic tangent line switching test item, has improved efficiency of software testing, has reduced operating personnel intensity of labour.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (4)
1. A testing device of a distribution transformer is characterized by being used for carrying out remote control and automatic switching on a no-load test and a load test of a transformer to be tested, and comprising a three-phase power supply (5), a power switching device (1), a three-phase voltage regulator (7), a secondary winding switching device (2), a first empty load tester (10), the transformer to be tested, a second empty load tester (11) and a primary winding switching device (4) which are sequentially and electrically connected;
the secondary winding switching device (2) is connected with a current input end of the first empty load tester (10), a voltage measuring end of the first empty load tester (10) is in short circuit with a current output end of the first empty load tester (10), and the current output end of the first empty load tester (10) is connected with a secondary winding of the transformer to be tested;
the primary winding of the transformer to be tested is connected with the current output end of the second air load tester (11), the voltage measuring end of the second air load tester (11) is in short circuit with the current output end of the second air load tester (11), the current input end of the second air load tester (11) is connected with the primary winding switching device (4), and the primary winding switching device (4) is connected with the secondary side of the three-phase voltage regulator (7);
the transformer short-circuit device is characterized by further comprising a short-circuit device (3), wherein the first end of the short-circuit device (3) is connected with the secondary winding of the transformer to be tested, and the second end of the short-circuit device (3) is in short circuit;
the three-phase power supply is characterized by further comprising a switching power supply (6) and a controller (9), wherein the primary side of the switching power supply (6) is connected with any two phases of the three-phase power supply (5), and the secondary side of the switching power supply (6) is respectively and electrically connected with the controller (9), the power supply switching device (1), the secondary winding switching device (2), the short-circuit device (3) and the primary winding switching device (4); the controller (9) is in signal connection with the control end of the power switching device (1), the control end of the secondary winding switching device (2), the control end of the short-circuit device (3) and the control end of the primary winding switching device (4) respectively.
2. The testing device of the distribution transformer according to claim 1, wherein the power switching device (1), the secondary winding switching device (2), the short-circuit device (3) and the primary winding switching device (4) are all of a three-pole single-throw normally-open structure.
3. The testing device of the distribution transformer according to claim 2, wherein the controller (9) controls the power switching device (1) and the secondary winding switching device (2) to be closed respectively when a no-load test is performed.
4. The testing device of the distribution transformer according to claim 2, wherein when a load test is performed, the controller (9) controls the power switching device (1), the short-circuit device (3) and the primary winding switching device (4) to be closed respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920515319.6U CN209979826U (en) | 2019-04-16 | 2019-04-16 | Testing device of distribution transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920515319.6U CN209979826U (en) | 2019-04-16 | 2019-04-16 | Testing device of distribution transformer |
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| CN209979826U true CN209979826U (en) | 2020-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051525A (en) * | 2020-07-10 | 2020-12-08 | 国家电网有限公司 | Transformer demagnetization analyzer and demagnetization analysis method |
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- 2019-04-16 CN CN201920515319.6U patent/CN209979826U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051525A (en) * | 2020-07-10 | 2020-12-08 | 国家电网有限公司 | Transformer demagnetization analyzer and demagnetization analysis method |
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