CN211826457U - Quick switching calibration device for primary winding of power transformer - Google Patents
Quick switching calibration device for primary winding of power transformer Download PDFInfo
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- CN211826457U CN211826457U CN202020119900.9U CN202020119900U CN211826457U CN 211826457 U CN211826457 U CN 211826457U CN 202020119900 U CN202020119900 U CN 202020119900U CN 211826457 U CN211826457 U CN 211826457U
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Abstract
The embodiment of the utility model provides a quick switching calibration equipment of power transformer primary winding is related to, include heavy current rising ware, standard current transformer, by current transformer, current load case, mutual-inductor check gauge and 5 at least circuit breakers. The calibration device is characterized in that a primary winding input connecting end of the primary winding input connecting end is connected to different wiring connecting ends of a large-current booster and a standard current transformer through a plurality of circuit breakers respectively through the rated current ratio of the current transformer to be detected, the circuit breakers are controlled to be closed and opened to control detection loops with different current ratios formed among the current booster and the standard current transformer, the rapid switching verification loops are realized, the working efficiency is improved, the workload is reduced, and the detection loops are prevented from being manually reconnected when the current ratios are different every time. The device detects conveniently, and easy operation has solved the current work efficiency of examining and determine power transformer and has hanged down and the great problem of work load.
Description
Technical Field
The utility model relates to a power transformer technical field especially relates to a power transformer primary winding fast switch over calibration equipment.
Background
In a distribution system of 6kV to 35kV in China, a current transformer is widely applied, whether the accuracy level of the current transformer is qualified or not has a great relation with both parties of electric power trade settlement, so that the current transformer is very important for factory verification of a high-voltage current transformer and purchasing and warehousing verification of an electric power company, the current transformer needs to be installed and used after being qualified through verification, and the method adopted in the verification process is mainly based on two verification rules of JJG313-2010 current transformer for measurement and JG1021-2007 electric power transformer.
In a power distribution system, a difference method is adopted for testing a current transformer, and the condition is that a standard current transformer and the tested current transformer have the same current ratio. Since the primary current of the standard current transformer is relatively large, for example, the current transformer to be tested is 200A/5A, the standard current transformer also needs to have a current ratio of 200A/5A, and even though the high-voltage current transformer installed in power installation generally adopts the national recommended primary current ratio, the primary current ratio is also large, and the primary current values of the high-voltage current transformers of 10kV are commonly 10A, 20A, 30A, 40A, 50A, 80A, 100A, 150A, 200A, 300A, 400A, 500A, and 600A. Therefore, the current transformers need to be calibrated by the standard current transformers with the current values of the previous time, when the current transformers to be detected with different rated current ratios are calibrated, the primary winding wiring of the standard current transformer and the primary winding wiring of the current booster need to be manually changed, the workload of wire changing is large, and the working efficiency is low; and the influence quantity test on the current transformer error is carried out under the condition of high voltage for the high-voltage current transformer, so that the primary winding is in a high-voltage state, a primary loop needs to be subjected to insulation treatment, and otherwise, the risk of voltage breakdown is caused under the high-voltage state of the primary loop.
Therefore, in view of the above situation, how to improve the verification efficiency of the power transformer and reduce the workload becomes an important technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a power transformer primary winding fast switch over calibration equipment for solve the low and big technical problem of work load of work efficiency of current examination power transformer.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a primary winding fast switching calibration device of a power transformer comprises a large-current booster, a standard current transformer, a current transformer to be tested, a current load box, a transformer calibration instrument and at least 5 circuit breakers;
the high-current booster is used for being connected with a voltage source and respectively connected with the standard current transformer and the circuit breaker;
the standard current transformer is used for being connected with the circuit breaker and the transformer tester respectively;
the detected current transformer is used for being connected with the current load box, the circuit breaker and the transformer detector respectively;
the circuit breaker is used for controlling whether the detected current transformer is connected with the standard current transformer and the large-current booster respectively.
Preferably, the input end of the large-current booster is connected with the voltage source, and the output end of the large-current booster is provided with at least 6 first output connection ends;
the currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
Preferably, at least 6 primary winding connection ends and 6 secondary winding connection ends are arranged on the standard current transformer.
Preferably, a primary winding input connection end and a secondary winding output connection end are arranged on the current transformer to be detected, one primary winding input connection end of the current transformer to be detected is connected with one contact connection end of the circuit breaker, and a primary winding input connection end of the other current transformer to be detected is connected with the other contact connection end of the circuit breaker;
and one secondary winding output connecting end of the detected current transformer is respectively connected with the output ends of the transformer detector and the standard current transformer, and the other secondary winding output connecting end of the detected current transformer is connected with the transformer detector after being connected with the current load box in series.
Preferably, each circuit breaker is provided with at least four contact connecting ends, and the four contact connecting ends are a first contact connecting end, a second contact connecting end, a third contact connecting end and a fourth contact connecting end respectively;
the first contact connecting end is used for being connected with the input connecting end of the standard current transformer;
the second contact connecting end is used for being connected with the output connecting end of the high-current booster;
the third contact connecting end is used for being connected with one primary winding input connecting end of the current transformer to be detected;
the fourth contact connecting end is used for being connected with the primary winding input connecting end of the other current transformer to be detected;
the third contact connecting ends of the 5 circuit breakers are all connected with a first conductive piece, and the first conductive piece is connected with one primary winding input connecting end of the current transformer to be detected; the fourth contact connecting ends of the 5 circuit breakers are all connected with a second conductive piece, and the second conductive piece is connected with the primary winding input connecting end of the other detected current transformer; the first contact connecting ends of the 5 circuit breakers are respectively connected with 5 input ends of the standard current transformer; and the second contact connecting ends of the 5 circuit breakers are respectively connected with 5 output ends of the high-current booster.
Preferably, each contact connecting end comprises two contacts, and the two contacts are connected in parallel and are short-circuited through a conducting strip.
Preferably, the electronic devices of the large-current booster, the standard current transformer, the current transformer to be detected and the 5 circuit breakers are connected through high-voltage cables.
Preferably, 5 of the circuit breakers are fixedly mounted on the insulating support. Wherein, the circuit breaker is a manual circuit breaker.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
this electric power mutual-inductor primary winding fast switch over calibration equipment receives its primary winding input connection end respectively through a plurality of circuit breakers to the different wiring link of heavy current rising ware and standard current transformer through the current ratio of being examined current transformer, adopt the closure and the disconnection of control circuit breaker to control and detect the return circuit that forms different current ratios between current transformer and current rising ware and the standard current transformer, realize fast switch over examination return circuit, improve work efficiency, reduce work load, avoid every current ratio of detecting the difference all needs artifical reconnection detection return circuit. The power transformer primary winding fast switching calibration device is convenient and fast to detect, simple to operate and capable of solving the problems that the existing power transformer calibration device is low in working efficiency and large in workload. The power transformer primary winding rapid switching calibration device is also suitable for calibrating large-batch current transformers to be tested, and the device is adopted only for replacing the current transformers to be tested, so that the working efficiency of calibrating the current transformers to be tested is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a circuit diagram of a primary detection loop of a primary winding fast switching calibration device of a power transformer.
Fig. 2 is a frame diagram of the connection of the circuit breaker of the power transformer primary winding fast switching calibration device.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the application provides a quick switching and checking device for primary windings of a power transformer, which is used for solving the technical problems of low working efficiency and large workload of the existing power transformer verification. In this embodiment, a current transformer is taken as a case-taking illustration, and other power transformers are also applicable to the scheme described in the embodiment of the present application.
The current transformer is verified according to two verification regulations of JJG313-2010 current transformer for measurement and JJG1021-2007 power transformer, and the current transformer needs to be detected sequentially by adopting a plurality of current ratios.
The existing calibrating device for the current transformer is characterized in that an operator manually connects a primary winding of a standard current transformer with a primary winding of a current booster, and when a current ratio of a current transformer to be detected is detected, the operator manually replaces the connection of the primary winding of the standard current transformer and the primary winding of the current booster, so that the detection mode has large workload of wire replacement and low working efficiency; and the high-voltage current transformer needs to be subjected to a high-voltage influence quantity test on the error of the current transformer, so that the adopted standard current transformer and the current booster need to be a high-voltage standard current transformer and a high-voltage current booster, and the primary winding also needs to be in a high-voltage state, so that the detection loop needs to be subjected to insulation treatment, the detection cost is increased, otherwise, the detection loop is in danger of voltage breakdown in the high-voltage state.
The embodiment of the utility model provides a power transformer primary winding fast switch over calibration equipment is applied to the high-voltage current transformer calibration that 6kV ~ 35kV distribution network used. Fig. 1 is the embodiment of the utility model provides a circuit diagram of a detection circuit of power transformer primary winding fast switch-over calibration equipment, fig. 2 is the embodiment of the utility model discloses a frame diagram of power transformer primary winding fast switch-over calibration equipment circuit breaker connection.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a power transformer primary winding fast switching verification apparatus, which includes a large current booster T1, a standard current transformer CTo, a current transformer to be detected CTx, a current load box Z, a transformer verifier and at least 5 circuit breakers DLQ of HE;
the high current booster T1 is used for connection to a voltage source and to a standard current transformer CTo and a circuit breaker DLQ, respectively.
The voltage of the voltage source is preferably 0 to 250V. The high-current booster T1 is tested in electrical equipment according to power departments and industrial and mining enterprises, such as: the special equipment is specially designed and manufactured for current load test and temperature rise test of various switches, current transformers and other electrical equipment.
The standard current transformer CTo is used for being connected with the circuit breaker DLQ and the transformer tester HE respectively.
It should be noted that the standard current transformer CTo is mainly used as a current transformer calibration standard in an error test of the transformer. The standard current transformer CTo is mainly composed of a primary coil, a secondary coil, an iron core, an insulating support, and a connecting end for outgoing lines. Wherein the primary coil is used for input and the secondary coil is used for output.
And the current transformer CTx to be detected is used for being respectively connected with the current load box Z, the circuit breaker DLQ and the transformer tester HE.
Note that the current transformer CTx to be tested needs a current transformer to be verified. The current transformer CTx to be detected is mainly composed of a primary winding, a secondary winding, an iron core, an insulating support, a connecting end for outgoing lines and the like. Wherein, the primary winding is used for inputting, and the secondary winding is used for outputting. In this embodiment, the outgoing line connection terminal of the primary winding of the current transformer CTx to be detected is denoted as a primary winding input connection terminal, the outgoing line connection terminal of the secondary winding is denoted as a secondary winding output connection terminal, and the current transformer CTx to be detected is provided with a primary winding input connection terminal and a secondary winding output connection terminal, which are respectively a first primary winding input connection terminal P1, a second primary winding input connection terminal P2, a first secondary winding output connection terminal S1, and a second secondary winding output connection terminal S2.
The embodiment of the utility model provides an in, circuit breaker DLQ mainly used control is examined whether the link of current transformer CTx's primary winding is connected with standard current transformer CTo and heavy current booster T1 respectively. At least four contact connecting ends are arranged on each circuit breaker DLQ, and the four contact connecting ends are respectively a first contact connecting end, a second contact connecting end, a third contact connecting end and a fourth contact connecting end. Specifically, when the input connection end of the primary winding of the current transformer CTx to be tested is connected to the third contact connection end and the fourth contact connection end of each breaker DQL, the first contact connection ends of 5 breakers DQL are connected to the 5 input connection ends of the standard current transformer CTo in a one-to-one correspondence manner, and the second contact connection ends of 5 breakers DQL are connected to the 5 output connection ends of the large-current step-up transformer T1 in a one-to-one correspondence manner; when one of the circuit breakers DLQ is in an on state, the other circuit breakers DLQ are in an off state, so that the current transformer CTx to be detected, the standard current transformer CTo and the high-current booster T1 form a detection loop of a primary current ratio. Because the currents output by the 5 output connecting ends of each large-current booster T1 are different, when the current transformer CTx to be detected needs to be detected under the condition of different current ratios, the current transformer CTx to be detected can be detected by switching on or off the 5 circuit breakers DLQ, and the verification of a plurality of current ratios can be realized, so that the detection is convenient and fast.
The circuit breaker DLQ is a switching device capable of closing, carrying, and opening a current under a normal circuit condition and closing, carrying, and opening a current under an abnormal circuit condition for a predetermined time.
The embodiment of the utility model provides an in, when current load box Z is inspection current, voltage transformer, the various payload that provide specially for when examining and determine current transformer, provide specified rated load and lower limit load (or refer to as light load) for current transformer CTx examined, the Z rated load of current load box shows with its apparent power under rated current.
The embodiment of the utility model provides an in, mutual-inductor inspection appearance HE is a special instrument for testing mutual-inductor, detects mutual-inductor's ratio error and angle error specially. During the experiment, the ratio error and the angle error between the standard mutual inductor and the tested mutual inductor are measured, and the test data can be uploaded to a computer for editing, storing or printing.
The utility model provides a pair of power transformer primary winding fast switch-over calibration equipment is than receiving its primary winding input connection end heavy current rising ware and standard current transformer's different wiring link respectively through a plurality of circuit breakers through the electric current that is examined current transformer, the detection return circuit that forms different electric current ratio between current transformer and current rising ware and the standard current transformer is controlled with the disconnection to the closure that adopts the control circuit breaker, realize fast switch-over examination return circuit, improve work efficiency, reduce work load, avoid the current every to detect different electric current ratio all to need artifical reconnection detection return circuit. The power transformer primary winding fast switching calibration device is convenient and fast to detect, simple to operate and capable of solving the problems that the existing power transformer calibration device is low in working efficiency and large in workload. The power transformer primary winding rapid switching calibration device is also suitable for calibrating large-batch current transformers to be tested, and the device is adopted only for replacing the current transformers to be tested, so that the working efficiency of calibrating the current transformers to be tested is improved.
In an embodiment of the present invention, the input terminal of the high current booster T1 is connected to the voltage source, and the output terminal of the high current booster T1 is provided with at least 6 first output connection terminals. The currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
It should be noted that how many first output connection terminals are arranged at the output end of the large-current booster T1 may be set according to how many current ratios need to be detected by the current transformer CTx to be detected.
In one embodiment of the present invention, at least 6 primary winding connection terminals and at least 6 secondary winding connection terminals are provided on the standard current transformer CTo.
The number of primary winding connection terminals and secondary winding connection terminals provided in the standard current transformer CTo is set according to how many current ratios the current transformer CTx to be tested needs to detect. Specifically, in the present embodiment, the 6 primary winding connection ends of the standard current transformer CTo are respectively denoted as L1, L2, L3, L4, L5, and L6; the 6 second output connections of the standard current transformer CTo are denoted as K1, K2, K3, K4, K5 and L6, respectively.
In an embodiment of the present invention, the first primary winding input connection end P1 of the current transformer to be tested CTx is connected to the third contact connection end of the circuit breaker DLQ, and the second primary winding input connection end P2 of the current transformer to be tested CTx is connected to the fourth contact connection end of the circuit breaker DLQ; and a first secondary winding output connecting end S1 of the current transformer CTx to be detected is connected with a transformer detector HE and a secondary winding connecting end K1 of a standard current transformer CTo, and a second secondary winding output connecting end S2 of the current transformer CTx to be detected is connected with a current load box Z in series and then is connected with the transformer detector HE.
In an embodiment of the present invention, the third contact connection terminals of the 5 DLQs are all connected to the first conductive member, and the first conductive member is connected to the first primary winding input connection terminal P1 of the current transformer CTx; the fourth contact connecting ends of the 5 circuit breakers DLQ are all connected with a second conductive piece, and the second conductive piece is connected with a second primary winding input connecting end P2 of the current transformer CTx to be detected; first contact connection ends of the 5 circuit breakers DLQ are respectively connected with 5 primary winding connection ends L1, L2, L3, L4 and L5 of the standard current transformer CTo; the second contact terminals of the 5 circuit breakers DLQ are connected to the 5 first output terminals 600A, 200A, 75A, 40A, 20A of the high-current step-up converter T1, respectively.
The utility model discloses an in one embodiment, every contact link on the DLQ of circuit breaker includes two contacts, through the parallelly connected short circuit of conducting strip between two contacts.
It should be noted that, two contacts are connected in parallel through a conducting strip for short circuit, and a circuit breaker with a rated current of half of the test current can be adopted. Because the common three-phase circuit breaker can only provide three loops, each circuit breaker needs to switch a primary winding of a standard current transformer CTo and a winding of a high-current booster T1, only two contact connecting ends are used, and one loop is wasted; meanwhile, the rated current of the contact connection end must be matched with the maximum winding current of the high-current booster T1, for example, the maximum rated current of the L5 winding of the standard current transformer CTo is 600A, a breaker with the rated current of 600A is needed, the winding of the high-current booster T1 matched with the breaker is T1_600A, and the breaker with the rated current of 600A is also needed, so that the cost is high; and one of the contact connecting ends is unused and wasted. The utility model adopts the DLQ circuit breaker with 4 contact connecting ends, wherein 2 contacts can be connected in parallel to connect the winding L5 of the standard current transformer CTo, and the other two contacts can be connected in parallel to connect the T1_600A of the heavy current booster T1, therefore, the maximum current test requirement of the winding can be satisfied when the rated current is 300A; meanwhile, the cost of the circuit breaker can be reduced, the 600A circuit breaker is more than 1 time more expensive than the 300A circuit breaker, the 600A circuit breaker is larger in size, and the occupied installation area of the device is large. In this embodiment, the 5 breaker DLQs are selected as 300A breaker DLQ, 100A1 breaker DLQ, 100A2 breaker DLQ, 100A3 breaker DLQ, and 100A4 breaker DLQ, respectively. The 300A circuit breaker DLQ with a single contact rated current of 300A can work through 600A current by using a contact connecting end of a parallel short double contact, and can be connected with an electronic device with 300A, 400A, 500A or 600A rated current. The 100A1 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 200A, 150A or 100A rated current electronics using a parallel shorted dual contact terminal to operate through 200A current. The 100A2 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 75A or 50A rated current electronics using a parallel shorted dual contact terminal operating through 200A current. The 100A3 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 40A or 30A rated current electronics using a parallel shorted dual contact terminal operating through 200A current. The 100A4 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 20A, 15A or 10A rated current electronics using a parallel shorted dual contact terminal operating through 200A current.
In an embodiment of the present invention, the conductive sheet may be a terminal copper bar.
In an embodiment of the present invention, the electronic devices, i.e., the high-current booster T1, the standard current transformer CTo, the current transformer to be tested CTx, and the 5 circuit breakers DLQ, are connected by a high-voltage cable.
It should be noted that the high-voltage cable may be a 35kV flexible high-voltage cable. The insulated high-voltage cable is used as a connecting wire, so that the high-voltage cable can bear high voltage while bearing excessive current, and can be used for a floor mopping test. The high-voltage cable can be placed in the air through the insulating support without the need of suspending the cable like a common cable in a high-voltage test, and the high-voltage cable can be placed at any position and on the ground at will without worrying about the problem of high-voltage breakdown.
In an embodiment of the present invention, 5 DLQs are all fixedly mounted on the insulating support. Wherein, the insulating support is made of insulating epoxy material. The circuit breaker DLQ can be closed or opened by manually toggling the handle.
It should be noted that, in the case that the DLQ is changed to a high-voltage circuit breaker, the DLQ can be controlled by a controller, and the control device can be a PLC controller, a computer, or a single chip microcomputer, and other technologies with mature technologies.
In an embodiment of the present invention, the 5 DLQ breakers all preferably use manual low-voltage circuit breakers.
It should be noted that one of the low-voltage circuit breakers is selected because all the DLQs are on the insulating support for insulating the high voltage, and the 10kV high voltage on the DLQ contact of the circuit breaker is insulated from the outside through the insulating support, so that the DLQ does not need to have an insulating requirement on the ground. Secondly because the breakpoint voltage of circuit breaker DLQ contact both sides is the output voltage of current booster (the utility model discloses the heavy current booster T1 output voltage maximum value who uses in is 30V), is less than the requirement of low-voltage circuit breaker contact cutting-off voltage (generally 600V), consequently also can satisfy the operation requirement.
The embodiment of the utility model provides an in the power transformer primary winding fast switch over calibration equipment fast switch over examine and examine the operation mode of current transformer CTx, for example: if the current ratio of the tested current transformer is verified to be 75A/5A, the 100A2 circuit breaker DLQ needs to be closed, and the other 4 circuit breakers DLQ are all opened, then the tested current transformer CTx with the current ratio of 75A/5A needs to be switched to for verifying one current ratio of the tested current transformer CTx with the current ratio of 300A/5A, at the moment, only the 100A2 circuit breaker DLQ needs to be opened, then the 300A circuit breaker DLQ is closed, the current ratio of 300A/5A can be verified for the tested current transformer CTx, and the primary winding of the standard current transformer CTo and the large-current booster T1 is rapidly switched. The power transformer primary winding fast switching calibration device is simple and convenient to operate, and the calibration work efficiency of a plurality of current ratios is high.
The utility model provides an in an embodiment, install the circuit breaker DLQ of 5 4 contact link ends on insulating support for withstand voltage to ground can reach 35kV on the circuit breaker DLQ. A wiring group corresponding to a primary winding connecting end L1-L5 of a standard current transformer CTo is connected to a contact A1 and a contact A2 of a corresponding DLQ circuit breaker by adopting 35kV soft high-voltage cables, wherein the contact A1 and the contact A2 are in short circuit by adopting short circuit conducting strips (terminal copper bars). And then, connecting the wiring groups corresponding to 20A, 40A, 75A, 200A and 600A of the high-current booster T1 to a contact A3 and a contact A4 of a DLQ (direct current) circuit breaker by using a 35kV soft high-voltage cable, wherein the contact A3 and the contact A4 are shorted by using short-circuit conducting strips (terminal copper bars). And a contact B1 and a contact B2 of 5 DLQ breakers are welded on a first conductive piece after short circuit by adopting a short circuit conductive piece (a terminal copper bar), and the first conductive piece is connected to a first primary winding input connecting end P1 of the current transformer CTx to be detected through a 10kV high-voltage cable. And a contact B3 and a contact B4 of 5 DLQ breakers are welded on a second conductive piece after short circuit by adopting a short circuit conductive piece (a terminal copper bar), and the second conductive piece is connected to a second primary winding input connecting end P2 of the current transformer CTx to be detected through a 10kV high-voltage cable.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The utility model provides a power transformer primary winding fast switch over calibration equipment which characterized in that, includes heavy current rising ware, standard current transformer, the current transformer of being examined, current load case, mutual-inductor check gauge and 5 at least circuit breakers:
the high-current booster is used for being connected with a voltage source and respectively connected with the standard current transformer and the circuit breaker;
the standard current transformer is used for being connected with the circuit breaker and the transformer tester respectively;
the detected current transformer is used for being connected with the current load box, the circuit breaker and the transformer detector respectively;
the circuit breaker is used for controlling whether the detected current transformer is connected with the standard current transformer and the large-current booster respectively.
2. The power transformer primary winding fast switching verification device according to claim 1, wherein an input end of the high-current booster is connected with the voltage source, and an output end of the high-current booster is provided with at least 6 first output connection ends;
the currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
3. The power transformer primary winding fast switching verification device according to claim 1, wherein at least 6 primary winding connection terminals and 6 secondary winding connection terminals are provided on the standard current transformer.
4. The power transformer primary winding fast switching verification device according to claim 1, wherein a primary winding input connection end and a secondary winding output connection end are arranged on the current transformer to be tested, one primary winding input connection end of the current transformer to be tested is connected with one contact connection end of the circuit breaker, and a primary winding input connection end of the other current transformer to be tested is connected with the other contact connection end of the circuit breaker;
and one secondary winding output connecting end of the detected current transformer is respectively connected with the output ends of the transformer detector and the standard current transformer, and the other secondary winding output connecting end of the detected current transformer is connected with the transformer detector after being connected with the current load box in series.
5. The power transformer primary winding fast switching verification device according to claim 1, wherein each of the circuit breakers is provided with at least four contact connection ends, the four contact connection ends being a first contact connection end, a second contact connection end, a third contact connection end and a fourth contact connection end;
the first contact connecting end is used for being connected with the input connecting end of the standard current transformer;
the second contact connecting end is used for being connected with the output connecting end of the high-current booster;
the third contact connecting end is used for being connected with one primary winding input connecting end of the current transformer to be detected;
the fourth contact connecting end is used for being connected with the primary winding input connecting end of the other current transformer to be detected;
the third contact connecting ends of the 5 circuit breakers are all connected with a first conductive piece, and the first conductive piece is connected with one primary winding input connecting end of the current transformer to be detected; the fourth contact connecting ends of the 5 circuit breakers are all connected with a second conductive piece, and the second conductive piece is connected with the primary winding input connecting end of the other detected current transformer; the first contact connecting ends of the 5 circuit breakers are respectively connected with 5 input ends of the standard current transformer; and the second contact connecting ends of the 5 circuit breakers are respectively connected with 5 output ends of the high-current booster.
6. The power transformer primary winding fast switching verification device as claimed in claim 5, wherein each said contact connection end includes two contacts, and two said contacts are short-circuited in parallel through a conducting strip.
7. The power transformer primary winding fast switching verification device of claim 6, wherein the conducting strips are terminal copper bars.
8. The power transformer primary winding fast switching verification apparatus according to claim 1, wherein the electronic devices of the high current booster, the standard current transformer, the current transformer to be tested and 5 circuit breakers are connected through high voltage cables.
9. The power transformer primary winding fast switching verification device according to claim 1, wherein 5 said circuit breakers are fixedly mounted on an insulating support.
10. The power transformer primary winding fast switching verification device of claim 1, wherein the circuit breaker is a manual circuit breaker.
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| CN202020119900.9U CN211826457U (en) | 2020-01-19 | 2020-01-19 | Quick switching calibration device for primary winding of power transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114823088A (en) * | 2022-06-23 | 2022-07-29 | 国网湖北省电力有限公司营销服务中心(计量中心) | Standard transformer and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114823088A (en) * | 2022-06-23 | 2022-07-29 | 国网湖北省电力有限公司营销服务中心(计量中心) | Standard transformer and using method thereof |
| CN114823088B (en) * | 2022-06-23 | 2022-09-23 | 国网湖北省电力有限公司营销服务中心(计量中心) | Standard transformer and using method thereof |
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