CN212008844U - Calibration instrument - Google Patents
Calibration instrument Download PDFInfo
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- CN212008844U CN212008844U CN202020035289.1U CN202020035289U CN212008844U CN 212008844 U CN212008844 U CN 212008844U CN 202020035289 U CN202020035289 U CN 202020035289U CN 212008844 U CN212008844 U CN 212008844U
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Abstract
The application provides a calibrator, which comprises a workbench and a power supply module; a timer is arranged on the workbench; the timer is provided with a pair of meter starting contacts and a pair of meter stopping contacts; the output end of the power supply module is connected with a first wiring terminal and a second wiring terminal in parallel; a first switch is arranged between the first wiring terminal and the power supply module; and a second switch is arranged between the second wiring terminal and the power supply module. According to the technical scheme provided by the embodiment of the application, the power supply module supplies power to one tripping coil through the first wiring terminal, and the timer records the time T used for the corresponding phase actual tripping of the circuit breaker to the other two-phase actual tripping1(ii) a The other two are jumped through the second connecting terminalAny one of the brake coils is powered, and the timer records the time length T from the corresponding connection of the breaker to the tripping instruction to the actual tripping2；T1‑T2And obtaining the actual non-full-phase protection action delay time of the time relay.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to a calibrator.
Background
At present, a 220kV voltage class circuit breaker mostly adopts a split-phase non-linkage operating mechanism, and due to various reasons, three phases of the circuit breaker can break one phase or two phases to cause non-full-phase operation, a protection device cannot solve the problem of inconsistent three-phase positions of the circuit breaker caused by equipment quality, loop problems and the like, and the protection device should be provided with non-full-phase protection capable of reflecting the non-full-phase operation state of the circuit breaker and act on tripping off the circuit breaker which is in an abnormal state; the non-full-phase protection can be realized by connecting a time relay in series in a switch body terminal box after the auxiliary contacts of the circuit breaker are combined, and after any phase is tripped, the time relay is electrified to control other two phases to complete tripping.
The time when the system is not operating in full phase should be limited because the system requires: when the system is in a non-full-phase operation state, components such as negative sequence and zero sequence in the system cause certain damage to electrical equipment; protection claims are as follows: some of the protection in the system may be in a startup state due to the presence of negative, zero sequence, etc. components.
Therefore, the calibration of the non-full-phase protection action delay is important, but a proper calibration instrument is not available at present.
Disclosure of Invention
In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide a prover.
The application provides a calibrator for calibrating a time relay in a non-full-phase protection circuit; the protection circuit comprises a time relay and three tripping coils; the three tripping coils are respectively used for controlling the three split phases of the circuit breaker to be disconnected; the three phases of the circuit breaker are respectively connected in parallel by a pair of normally open points and connected in parallel by a pair of normally closed points; the normally open point and the normally closed point are connected in series with the time relay and are used for controlling a coil of the time relay to be electrified, and the time relay comprises a workbench and a power supply module; a timer is arranged on the workbench; the timer is provided with a pair of meter starting contacts and a pair of meter stopping contacts; the output end of the power supply module is connected with a first wiring terminal and a second wiring terminal in parallel; a first switch is arranged between the first wiring terminal and the power supply module; and a second switch is arranged between the second wiring terminal and the power supply module.
Furthermore, the second switch is also provided with a pair of auxiliary contacts; the auxiliary contact is connected with the start meter contact.
Further, the first connection terminal is configured to be electrically connected to the phase a trip coil.
Further, the second connection terminal is configured to be electrically connected to the B/C phase trip coil.
Further, the stopwatch contact is configured to connect with a B/C phase normally closed auxiliary contact of the circuit breaker.
Further, the start-up contacts are configured to connect with the phase a normally closed auxiliary contacts of the circuit breaker.
The application has the advantages and positive effects that: the power supply module supplies power to one tripping coil through the first wiring terminal, and the timer records the time length T from actual tripping of the corresponding phase of the circuit breaker to actual tripping of the other two phases1(ii) a The second wiring terminal supplies power to any one of the other two tripping coils, and the timer records the time length T from the corresponding phase connection of the circuit breaker to the tripping instruction to the actual tripping2；T1-T2And obtaining the actual non-full-phase protection action delay time of the time relay.
Drawings
Fig. 1 is a schematic structural diagram of a calibrator provided in an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of a timer connection of a calibrator provided in an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a power module connection of the calibrator according to the embodiment of the present application.
The text labels in the figures are represented as: 100-a workbench; 110-a first switch; 120-a second switch; 121-auxiliary contacts; 200-a power module; 210-a first connection terminal; 220-a second connection terminal; 300-a timer; 310-start watch contact; 320-stop watch contact; 410-a time relay; 420-a trip coil; 430-normally open point; 440-normally closed point; a 450-B/C phase normally closed auxiliary contact; a 460-A phase normally closed auxiliary contact.
Detailed Description
The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.
Referring to fig. 1, the present embodiment provides a calibration apparatus for calibrating a time relay 410 in a non-all-phase protection circuit; the protection circuit comprises a time relay 410 and three tripping coils 420, wherein the three tripping coils 420 are respectively used for controlling three split-phase tripping of the circuit breaker, three phases of the circuit breaker are respectively connected in parallel by a pair of normally-open points 430, connected in parallel by a pair of normally-closed points 440, and then connected in series with a normally-open point group, a normally-closed point group and the time relay 410, when the three phases of the circuit breaker are in different states, the circuit is conducted, the time relay 410 is electrified, so that the tripping coils 420 are controlled to be electrified, and finally the three phases of the circuit breaker are completely disconnected; the calibrator includes a work bench 100 and a power module 200; the working table 100 is provided with a timer 300, and the timer 300 is provided with a pair of meter starting contacts 310 and a pair of meter stopping contacts 320; the output end of the power module 200 is connected in parallel with a first connection terminal 210 and a second connection terminal 220, and a first switch 110 is arranged between the first connection terminal 210 and the power module 200; a second switch 120 is disposed between the second connection terminal 220 and the power module 200.
Referring to fig. 2, in a preferred embodiment, the second switch 120 is further provided with a pair of auxiliary contacts 121, the auxiliary contacts 121 are connected to the watch start contact 310, when the second switch 120 is pressed, the watch start contact 310 is turned on, and the timer 300 starts to count time.
Referring further to fig. 3, in a preferred embodiment, the first connection terminal 210 is electrically connected to the trip coil 420 of the phase controlling circuit breaker a for supplying power to the trip coil 420.
In a preferred embodiment, the second connection terminal 220 is electrically connected to a trip coil 420 controlling a B/C phase of the circuit breaker for supplying power to the trip coil 420.
In a preferred embodiment, the stopwatch contact 320 is connected to the normally closed auxiliary contact 450 of the breaker phase B/C, and the stopwatch contact 320 is turned on and the timer 300 is timed to stop while the breaker phase B/C is open.
In a preferred embodiment, the watch dog contact 310 is also connected to the normally closed auxiliary contact 460 of breaker phase a, and when the breaker phase a is opened, the watch dog contact 310 is turned on and the timer 300 starts counting.
The checking method comprises the following steps:
initializing, namely closing all three phases of the circuit breaker, switching on a power supply by a protection circuit, and setting the action duration T of the time relay 410;
next, the first switch 110 is closed, and the display duration T of the timer 300 is recorded1，T1The time length from the phase A of the circuit breaker to the phase B and the phase C of the circuit breaker;
next, closing all three phases of the circuit breaker;
next, the second switch 120 is closed, and the display duration T of the timer 300 is recorded2，T2The time length from the connection of the B/C phase of the circuit breaker to the tripping instruction to the completion of the tripping is taken;
next, with T1-T2Obtaining non-full-phase protection action delay T3；
Next, by comparing T3And T is checked.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other contexts without modification may be viewed as within the scope of the present application.
Claims (6)
1. A calibrator for calibrating a time relay (410) in a non-full phase protection circuit; the protection circuit comprises a time relay (410) and three trip coils (420); the three tripping coils (420) are respectively used for controlling the three split phases of the circuit breaker to be disconnected; the three phases of the circuit breaker are respectively connected in parallel by a pair of normally open points (430) and a pair of normally closed points (440); the normally open point (430) and the normally closed point (440) are connected with the time relay (410) in series and used for controlling the coil of the time relay (410) to be electrified, and the device is characterized by comprising a workbench (100) and a power supply module (200); a timer (300) is arranged on the workbench (100); the timer (300) is provided with a pair of meter starting contacts (310) and a pair of meter stopping contacts (320); the output end of the power supply module (200) is connected with a first wiring terminal (210) and a second wiring terminal (220) in parallel; a first switch (110) is arranged between the first wiring terminal (210) and the power supply module (200); and a second switch (120) is arranged between the second wiring terminal (220) and the power supply module (200).
2. The verifier of claim 1, wherein the second switch (120) further comprises a pair of auxiliary contacts (121); the auxiliary contact (121) is connected with the watch starting contact (310).
3. The prover of claim 1 wherein the first wire connection terminal (210) is configured for electrical connection with the trip coil (420) phase a.
4. The prover of claim 1 wherein the second terminal (220) is configured for electrical connection to the trip coil (420) of phase B/C.
5. The verifier of claim 1, wherein the stop watch contacts (320) are configured to connect with B/C-phase normally closed auxiliary contacts (450) of the circuit breaker.
6. The verifier of claim 1, wherein the rising contact (310) is configured to connect with a phase a normally closed auxiliary contact (460) of the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020035289.1U CN212008844U (en) | 2020-01-08 | 2020-01-08 | Calibration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020035289.1U CN212008844U (en) | 2020-01-08 | 2020-01-08 | Calibration instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212008844U true CN212008844U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020035289.1U Active CN212008844U (en) | 2020-01-08 | 2020-01-08 | Calibration instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212008844U (en) |
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2020
- 2020-01-08 CN CN202020035289.1U patent/CN212008844U/en active Active
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