CN211905644U - Polarity testing device for current transformer - Google Patents
Polarity testing device for current transformer Download PDFInfo
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- CN211905644U CN211905644U CN202020375069.3U CN202020375069U CN211905644U CN 211905644 U CN211905644 U CN 211905644U CN 202020375069 U CN202020375069 U CN 202020375069U CN 211905644 U CN211905644 U CN 211905644U
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Abstract
The application discloses current transformer polarity testing arrangement includes: the primary side module and the secondary side module are in communication connection; the primary side module comprises a direct current power supply, a switch, a resistor and a CT primary winding which are connected in sequence and is connected with the primary side of the current transformer; the CT primary winding comprises 4 wiring input terminals and is used for testing the three-phase polarity of the CT at the same time; the secondary side module comprises a direct current meter and a CT secondary winding and is connected with the secondary side of the current transformer. The technical problem that in the prior art, the test process is long in time consumption and test results are inaccurate easily due to the fact that testers are matched is solved by simultaneously testing the three-phase polarity of the circuit transformer and the primary side module and the secondary side module which are separately arranged.
Description
Technical Field
The application relates to the technical field of electrical equipment, in particular to a polarity testing device for a current transformer.
Background
Current Transformers (CTs) are important electrical devices in power systems, and perform the functions of isolating high and low voltage systems and converting high voltage to low voltage. Whether the wiring is correct or not has important significance for the normal work of equipment such as protection, measurement, metering and the like of the system. When a CT is newly installed for operation or a CT secondary cable is replaced, the correctness of CT wiring is checked by using a polarity test method, and the method is a working procedure of relay protection workers.
The conventional polarity test method comprises the following steps: 1. the positive pole of the battery is connected with the 'A' on the primary side of the single-phase current transformer, and the negative pole of the battery is connected with the 'X' on the primary side of the single-phase current transformer. 2. And connecting the positive pole of the direct current voltmeter with the 'a' of the secondary side of the single-phase voltage transformer, and connecting the negative pole of the direct current voltmeter with the 'x' of the secondary side of the single-phase voltage transformer. 3. When the battery switch is closed, if the direct current voltmeter should indicate positively; when the battery is disconnected, the voltmeter responds to an indication, and the polarity of the current transformer is correct.
As the current transformer CT of a substation is usually wound more, for example: the method comprises the following steps that single-phase CT is configured for the three phases of A, B and C of a 110kV line CT, each phase CT generally comprises 5 windings such as protection, measurement, metering, wave recording and bus differential protection, and when the CT polarity is carried out, each winding of each phase is required to be carried out item by item, so that the time consumption is long; in addition, in the testing process, because the primary side winding is in an outdoor high-voltage field and the secondary side cable is in an outdoor control room, two persons need to be matched without errors, and therefore errors are easy to occur.
SUMMERY OF THE UTILITY MODEL
The application provides a current transformer polarity testing arrangement, through the three-phase polarity of testing circuit transformer simultaneously and separation setting's once side module and secondary side module, it is long that the test procedure among the prior art consumes time to need the tester cooperation and lead to the inaccurate technical problem of test result easily.
The application provides a current transformer polarity testing arrangement includes:
the primary side module and the secondary side module are in communication connection;
the primary side module comprises a direct current power supply, a switch, a resistor and a CT primary winding which are connected in sequence and is connected with the primary side of the current transformer; the CT primary winding comprises 4 wiring input terminals and is used for testing the three-phase polarity of the CT at the same time;
the secondary side module comprises a direct current meter and a CT secondary winding and is connected with the secondary side of the current transformer.
Optionally, the 4 wire input terminals include a first terminal, a second terminal, a third terminal, and a fourth terminal; the first terminal is connected with the primary side of the CT; the second terminal is connected to the bus-bar-near side of the A-phase CT; the third terminal is connected with the side, close to the bus, of the B-phase CT; and the third terminal is connected with the side, close to the bus, of the C-phase CT.
Optionally, the switch comprises a switch-on/off switch for controlling the switch manually or remotely.
Optionally, the secondary side module further includes three test loops, each for connecting to a secondary side of a three phase of the CT.
Optionally, the primary side module further includes a first signal transmission unit connected to the dc power supply.
Optionally, the secondary side module further comprises a second signal transmission unit connected to the dc current meter.
Optionally, the secondary side module further comprises an indicator light connected to the dc current meter.
Optionally, the primary side module further includes a control unit connected to the dc power supply.
Optionally, the control unit is a single chip microcomputer.
Optionally, the dc power supply is a rechargeable battery.
The application provides a current transformer polarity testing arrangement includes:
the primary side module and the secondary side module are in communication connection;
the primary side module comprises a direct current power supply, a switch, a resistor and a CT primary winding which are connected in sequence and is connected with the primary side of the current transformer; the CT primary winding comprises 4 wiring input terminals and is used for testing the three-phase polarity of the CT at the same time;
the secondary side module comprises a direct current meter and a CT secondary winding and is connected with the secondary side of the current transformer.
The application provides a current transformer polarity testing arrangement, through the once side module and the secondary side module of separation setting, wherein, once the side module and be provided with 4 binding post, can measure current transformer's three-phase polarity simultaneously, the secondary side module is provided with the three-phase test return circuit that corresponds with once the side module, consequently can realize testing current transformer's three-phase polarity simultaneously. The primary side module and the secondary side module which are separately arranged and in communication connection can reduce the matching pressure of operators in the field test process and improve the accuracy of the test result. The technical problem that in the prior art, the test process is long in time consumption and test results are inaccurate easily due to the fact that testers are matched is solved by simultaneously testing the three-phase polarity of the circuit transformer and the primary side module and the secondary side module which are separately arranged.
Drawings
Fig. 1 is a first schematic structural diagram of a primary side module of a current transformer polarity testing apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a secondary side module of a current transformer polarity testing apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a primary side module of a current transformer polarity testing apparatus according to an embodiment of the present disclosure;
fig. 4 is a schematic test wiring diagram of a conventional single-phase double-winding current transformer.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to a test wiring schematic diagram of the single-phase double-winding current transformer shown in fig. 4, a polarity test wiring diagram of the current transformer in the diagram includes a direct-current power supply E, a control switch K, a current-limiting resistor R and a direct-current ammeter PA, and the polarity of the single-phase double-winding current transformer is checked by a direct-current method. Wherein, L1-L2 are CT primary windings (L1 is near the bus side), and K1-K2 are CT secondary windings. In the test process, when the control switch K is closed, the direct-current voltmeter should indicate positively; when the control switch K is switched off, the ammeter responds to an indication that the polarity of the tested single-phase double-winding current transformer is correct. When the PA is positively biased or negatively biased, an opening amount is input into the control unit so as to adapt to the requirement of data transmission, if the PA is positively biased, the control processing unit is opened to 1, and if the PA is negatively biased, the control processing unit is opened to 0.
The application provides a current transformer polarity testing arrangement, through the three-phase polarity of testing circuit transformer simultaneously and separation setting's once side module and secondary side module, it is long that the test procedure among the prior art consumes time to need the tester cooperation and lead to the inaccurate technical problem of test result easily.
For easy understanding, please refer to fig. 1-3, fig. 1 is a schematic structural diagram of a primary side module of a current transformer polarity testing apparatus provided in the present application; fig. 2 is a schematic structural diagram of a secondary side module of a polarity testing apparatus for a current transformer provided in the present application; fig. 3 is a schematic structural diagram of a primary side module of the current transformer polarity testing apparatus provided in the present application.
The embodiment of the application provides a current transformer polarity testing arrangement, includes:
the primary side module and the secondary side module are in communication connection;
the primary side module comprises a direct current power supply, a switch, a resistor and a CT primary winding which are connected in sequence and is connected with the primary side of the current transformer; the CT primary winding comprises 4 wiring input terminals and is used for testing the three-phase polarity of the CT at the same time;
the secondary side module comprises a direct current meter and a CT secondary winding and is connected with the secondary side of the current transformer.
It should be noted that, in the polarity testing apparatus for a current transformer provided in the present application, as shown in the schematic connection diagram of the primary side module shown in fig. 1, the primary side module includes a dc power supply E, a control switch K, a current limiting resistor R, and a dc current meter PA, and L1-L2 are CT primary windings (L1 is near the bus side). The primary side module is provided with 4 wiring input terminals which are all connected to the primary side of the CT, wherein LA1To the bus-proximal side of the A-phase CT, LB1To the bus-proximal side of the B-phase CT, LC1And the N is a public end and is connected to the side, close to the bus, of the C-phase CT. The secondary module is provided with three test circuits corresponding to the 4 wiring input terminals of the primary module, and the three test circuits are respectively connected to the secondary side of A, B, C three-phase CT and are respectively wired to the secondary side of A, B, C three-phase CT, and the wiring diagram of the secondary module is shown in fig. 2. In particular, the polarity display condition can be displayed by the direction of the 3 pointer type ampere meters, and can also be displayed in the form of an output indicator lamp, and a positive polarity indicator lamp and a reverse polarity indicator lamp are arranged.
Further, the 4 wire input terminals include a first terminal, a second terminal, a third terminal, and a fourth terminal; the first terminal is connected with the primary side of the CT; the second terminal is connected with the near bus side of the A-phase CT; the third terminal is connected with the bus side near the B-phase CT; the third terminal is connected to the bus-bar-near side of the C-phase CT.
It should be noted that the primary side module is provided with 4 wiring input terminals, all connected to the primary side of CT, where LA1To the bus-proximal side of the A-phase CT, LB1To the bus-proximal side of the B-phase CT, LC1And the N is a public end and is connected to the side, close to the bus, of the C-phase CT.
Further, the switch comprises a switch-on/off switch used for controlling the switch through manual operation or remotely controlling the switch.
The on-off of the control switch of the primary side module has two control modes, namely a local mode and a manual on-off, and a remote mode and a remote control on-off. When the control unit receives a remote switching-off (or switching-on) command, the control unit outputs a switching-off (or switching-on) pulse to control the switch to switch off (or switch on). The switching of the two modes can be switched by a switch, and when the switch is switched to a remote position, the control unit outputs a switching quantity 1; when switched to the "in-place" position, the control unit outputs a switching value of 0. Through remote control divide-shut brake, can solve the technical problem that needs the tester highly complex among the traditional test method, this application can accomplish test operation through a tester, also can avoid because personnel cooperate the mistake that probably appears improperly, improves the degree of accuracy of test result.
The remote control process comprises the following steps: the primary side module controls a switch in a remote/local mode, and when the switch is switched to the remote mode, the on/off of the control switch K can be realized only by remote control. The secondary side module can be provided with a corresponding test button S, when the test button is pressed down, an open access point of the control unit 0 of the secondary side is closed, and at the moment, the control unit of the secondary side module sends a signal for remotely controlling K to be switched on to the primary side module through the second signal transmission unit; after receiving the remote control command, the first signal transmission unit on the primary side opens the command to the control unit of the primary side module, so that the control unit of the primary side module outputs a switching-on command to the control switch K; and the control switch K is closed after receiving a closing command. The control flow is as follows: the primary side module (the remote control button transmits the remote control input command to the control unit, the control unit transmits the remote control input command to the first signal transmission unit) and transmits the command through wireless connection with the secondary side module (the second signal transmission unit transmits the remote control command to the control unit, and the control unit transmits the remote control command to the control switch). At this time, the test loop of the current transformer is connected, and the direct current ammeter corresponding to the secondary side module can display the test result. When the secondary wiring is confirmed to be correct, if the polarity shows positive polarity, the test result is in accordance with the requirement, and the secondary side module can automatically feed back the test result of the positive polarity to the primary side module. After the primary side module receives the polarity test result sent from the secondary side module, a field tester of the primary side module can manually send a confirmation signal to the secondary side module. And after the secondary side module receives the confirmation signal, a tester of the secondary side module can perform the test operation of the next polarity. The modules on the two sides can facilitate the testing work of testers through signal transmission, and ensure the correctness of the testing result. And, when the wiring diagram of the primary side module is as shown in fig. 3, the transmission process of the signal may be that the primary side module inputs a signal to the control unit through a confirmation button, so that the control unit transmits the input signal to the first signal transmission unit, the first signal transmission unit transmits the input signal to the second signal transmission unit through wireless communication, the second signal transmission unit transmits the input signal to the control unit of the secondary side module, and the control unit controls the indicator light of the secondary side module to make a corresponding prompt according to the input signal.
Further, the secondary side module also comprises three test loops which are respectively used for connecting the three phases of the secondary side of the CT.
It should be noted that, corresponding to the 4 connection input terminals of the primary side module, the secondary side module is provided with three test circuits, which are respectively connected to the secondary sides of A, B, C three-phase CTs and respectively connected to the secondary sides of A, B, C three-phase CTs, and the connection diagram of the secondary side module is shown in fig. 2.
Furthermore, the primary side module further comprises a first signal transmission unit connected with the direct current power supply.
The first signal transmission unit of the primary-side module is connected to a dc power supply.
Further, the secondary side module also comprises a second signal transmission unit which is connected with the direct current ammeter.
It should be noted that the second signal transmission unit of the secondary side module is connected to the dc current meter.
Further, the secondary side module still includes the pilot lamp, is connected with the direct current ammeter.
The indicator lamp of the secondary side module is also connected to the dc current meter.
Furthermore, the primary side module further comprises a control unit connected with the direct current power supply.
The control unit of the primary side module is connected to a dc power supply.
Further, the control unit is a single chip microcomputer.
It should be noted that the control unit may be a single chip.
Further, the direct current power supply is a rechargeable battery.
It should be noted that the dc power supply may be a rechargeable battery with a large capacity, and may be provided with a battery capacity display unit, which may be an indicator light, and may make a corresponding prompt when the battery capacity is lower than 20%. So as to prevent the possible adverse effect on the measurement result caused by insufficient electric quantity and ensure that sufficient electric quantity can be ensured to complete the related test. Meanwhile, an internal resistance detection function can be set to discover the abnormal condition of the battery as early as possible.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A current transformer polarity test device, characterized by includes:
the primary side module and the secondary side module are in communication connection;
the primary side module comprises a direct current power supply, a switch, a resistor and a CT primary winding which are connected in sequence and is connected with the primary side of the current transformer; the CT primary winding comprises 4 wiring input terminals and is used for testing the three-phase polarity of the CT at the same time;
the secondary side module comprises a direct current meter and a CT secondary winding and is connected with the secondary side of the current transformer.
2. The current transformer polarity testing arrangement of claim 1, wherein said 4 wiring input terminals comprise a first terminal, a second terminal, a third terminal, and a fourth terminal; the first terminal is connected with the primary side of the CT; the second terminal is connected to the bus-bar-near side of the A-phase CT; the third terminal is connected with the side, close to the bus, of the B-phase CT; and the third terminal is connected with the side, close to the bus, of the C-phase CT.
3. The polarity testing device of a current transformer according to claim 1, wherein said switch comprises a switch-off and switch-on for manually controlling said switch or remotely controlling said switch.
4. The polarity testing apparatus of claim 1, wherein the secondary side module further comprises three testing loops for connecting the secondary sides of the three phases of the CT, respectively.
5. The polarity testing apparatus of claim 1, wherein the primary-side module further comprises a first signal transmission unit connected to the dc power supply.
6. The polarity testing device of the current transformer according to claim 1, wherein the secondary side module further comprises a second signal transmission unit connected to the dc current meter.
7. The current transformer polarity testing device of claim 1, wherein the secondary side module further comprises an indicator light connected to the dc current meter.
8. The polarity testing apparatus of claim 1, wherein the primary-side module further comprises a control unit connected to the dc power supply.
9. The polarity testing device of claim 8, wherein the control unit is a single-chip microcomputer.
10. The polarity testing apparatus of claim 1, wherein said dc power source is a rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020375069.3U CN211905644U (en) | 2020-03-23 | 2020-03-23 | Polarity testing device for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020375069.3U CN211905644U (en) | 2020-03-23 | 2020-03-23 | Polarity testing device for current transformer |
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| Publication Number | Publication Date |
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| CN211905644U true CN211905644U (en) | 2020-11-10 |
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| CN202020375069.3U Active CN211905644U (en) | 2020-03-23 | 2020-03-23 | Polarity testing device for current transformer |
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| CN (1) | CN211905644U (en) |
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