A calibrator and a calibration method

Abstract

The present application provides a calibrator and a calibration method. The calibrator includes a workbench and a power supply module; a timer is provided on the workbench; a pair of start watch contacts and a pair of stop watch contacts are provided on the timer; the output end of the power supply module is connected in parallel with a first wiring terminal and a second wiring terminal; a first switch is provided between the first wiring terminal and the power supply module; a second switch is provided between the second wiring terminal and the power supply module. According to the technical solution provided by the embodiment of the present application, the power supply module supplies power to a trip coil through the first wiring terminal, and the timer records the duration T1 from the actual trip of the corresponding phase of the circuit breaker to the actual trip of the other two phases; power is supplied to any one of the other two trip coils through the second wiring terminal, and the timer records the duration T2 from the corresponding phase of the circuit breaker receiving the trip instruction to the actual trip; the actual non-phase protection action delay duration of the time relay is obtained by T1 - T2.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and particularly relates to a calibrator and a calibration method. Background Art

[0002] At present, most of the 220 kV voltage class circuit breakers adopt a split-phase non-linkage operating mechanism. Due to various reasons, one or two phases of the three phases of the circuit breaker may be disconnected, resulting in non-full-phase operation. For the situation where the three-phase positions of the circuit breaker are inconsistent due to equipment quality, loop problems, etc., the protection device itself cannot solve it. A non-full-phase protection that can reflect the non-full-phase operation state of the circuit breaker should be installed, which acts on tripping the circuit breaker that is already in an abnormal state; the non-full-phase protection can be realized by combining the auxiliary contacts of the circuit breaker and connecting a time relay in series in the switch body terminal box. After any phase is tripped, the time relay is energized to control the other two phases to complete the tripping.

[0003] The time of the system in non-full-phase operation should be limited because the system requires that when the system is in non-full-phase operation, the negative sequence, zero sequence and other components that appear in the system cause certain harm to electrical equipment; the protection requires that due to the appearance of negative sequence, zero sequence and other components, some protections in the system may be in the starting state.

[0004] Therefore, it is crucial to calibrate the action delay of the non-full-phase protection, but currently there is a lack of a suitable calibration instrument. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a calibrator and a calibration method.

[0006] In a first aspect, the present application provides a calibrator for calibrating a time relay in a non-full-phase protection circuit; the protection circuit includes a time relay and three tripping coils; the three tripping coils are respectively used to control the disconnection of three split-phases of the circuit breaker; a pair of normally open contacts are taken from each of the three phases of the circuit breaker and connected in parallel, and a pair of normally closed contacts are taken and connected in parallel; the normally open contacts and the normally closed contacts are connected in series with the time relay to control the energization of the coil of the time relay, and it includes a workbench and a power supply module; a timer is provided on the workbench; a pair of start watch contacts and a pair of stop watch contacts are provided on the timer; a first wiring terminal and a second wiring terminal are connected in parallel at the output end of the power supply module; a first switch is provided between the first wiring terminal and the power supply module; a second switch is provided between the second wiring terminal and the power supply module.

[0007] Further, a pair of auxiliary contacts are also provided on the second switch; the auxiliary contacts are connected to the start watch contacts.

[0008] Further, the first wiring terminal is configured to be electrically connected to the A-phase tripping coil.

[0009] Further, the second terminal is configured to be electrically connected to the B / C phase trip coil.

[0010] Further, the stopwatch contact is configured to be connected to the normally closed auxiliary contact of the B / C phase of the circuit breaker.

[0011] Further, the startwatch contact is configured to be connected to the normally closed auxiliary contact of the A phase of the circuit breaker.

[0012] In a second aspect, the present application provides a calibration method, including the following steps:

[0013] Initialization: Close all three phases of the circuit breaker, turn on the power supply of the protection circuit, and set the action duration T of the time relay.

[0014] Next, close the first switch, and record the displayed duration T1 of the timer. T1 is the duration from the disconnection of the A phase of the circuit breaker to the disconnection of the B phase and the C phase.

[0015] Next, close all three phases of the circuit breaker.

[0016] Next, close the second switch, and record the displayed duration T2 of the timer. T2 is the duration from when the B / C phase of the circuit breaker receives a trip command to the completion of tripping.

[0017] Next, obtain the non-full-phase protection action delay T3 by T1 - T2.

[0018] Next, complete the calibration by comparing T3 with T.

[0019] The advantages and positive effects of the present application are as follows: The power supply module supplies power to one trip coil through the first terminal, and the timer records the duration T1 from the actual tripping of the corresponding phase of the circuit breaker to the actual tripping of the other two phases; power is supplied to any one of the other two trip coils through the second terminal, and the timer records the duration T2 from when the corresponding phase of the circuit breaker receives a trip command to the actual tripping; the actual non-full-phase protection action delay duration of the time relay is obtained by T1 - T2. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the calibrator provided by the embodiment of the present application;

[0021] Figure 2 It is a schematic circuit diagram of the connection between the timer of the calibrator provided by the embodiment of the present application;

[0022] Figure 3 It is a schematic circuit diagram of the connection between the power supply module of the calibrator provided by the embodiment of the present application.

[0023] The text annotations shown in the figure are as follows: 100 - workbench; 110 - first switch; 120 - second switch; 121 - auxiliary contact; 200 - power supply module; 210 - first terminal; 220 - second terminal; 300 - timer; 310 - start contact of the timer; 320 - stop contact of the timer; 410 - time relay; 420 - trip coil; 430 - normally open contact; 440 - normally closed contact; 450 - normally closed auxiliary contact of phase B / C; 460 - normally closed auxiliary contact of phase A. Specific embodiments

[0024] To enable those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present application.

[0025] In the first aspect, please refer to Figure 1 , this embodiment provides a calibrator for calibrating the time relay 410 in the non - all - phase protection circuit; the protection circuit includes a time relay 410 and three trip coils 420. The three trip coils 420 are respectively used to control the three - phase tripping of the circuit breaker. For the three phases of the circuit breaker, a pair of normally open contacts 430 are taken in parallel, and a pair of normally closed contacts 440 are taken in parallel. Then, the normally open contact group, the normally closed contact group and the time relay 410 are connected in series. When the three phases of the circuit breaker are in different states, the circuit is conducted, the time relay 410 is powered on, thereby controlling the trip coil 420 to be powered on, and finally realizing the complete disconnection of the three phases of the circuit breaker; the calibrator includes a workbench 100 and a power supply module 200; a timer 300 is provided on the workbench 100, and a pair of start contacts 310 and a pair of stop contacts 320 are provided on the timer 300; the output terminals of the power supply module 200 are connected in parallel with a first terminal 210 and a second terminal 220. A first switch 110 is provided between the first terminal 210 and the power supply module 200; a second switch 120 is provided between the second terminal 220 and the power supply module 200.

[0026] Please further refer to Figure 2 , in a preferred embodiment, a pair of auxiliary contacts 121 are also provided on the second switch 120. The auxiliary contacts 121 are connected to the start contacts 310 of the timer. When the second switch 120 is pressed, the start contacts 310 are conducted, and the timer 300 starts timing.

[0027] Please further refer to Figure 3 , in a preferred embodiment, the first terminal 210 is electrically connected to the trip coil 420 that controls the A - phase of the circuit breaker, and is used to supply power to the trip coil 420.

[0028] In a preferred embodiment, the second terminal 220 is electrically connected to the trip coil 420 that controls the B / C phase of the circuit breaker, and is used to supply power to the trip coil 420.

[0029] In a preferred embodiment, the stopwatch contact 320 is connected to the normally closed auxiliary contact 450 of the B / C phase of the circuit breaker. When the B / C phase of the circuit breaker is disconnected, the stopwatch contact 320 is turned on, and the timing of the timer 300 stops.

[0030] In a preferred embodiment, the startwatch contact 310 is also connected to the normally closed auxiliary contact 460 of the A phase of the circuit breaker. When the A phase of the circuit breaker is disconnected, the startwatch contact 310 is turned on, and the timer 300 starts timing.

[0031] Second, this embodiment provides a calibration method, including the following steps:

[0032] Initialization: Close all three phases of the circuit breaker, turn on the power supply of the protection circuit, and set the action duration T of the time relay 410.

[0033] Next, close the first switch 110, and record the displayed duration T1 of the timer 300. T1 is the duration from the disconnection of the A phase of the circuit breaker to the disconnection of the B and C phases.

[0034] Next, close all three phases of the circuit breaker.

[0035] Next, close the second switch 120, and record the displayed duration T2 of the timer 300. T2 is the duration from when the B / C phase of the circuit breaker receives the trip command to the completion of the trip.

[0036] Next, obtain the non-full-phase protection action delay T3 by T1 - T2.

[0037] Next, complete the calibration by comparing T3 with T.

[0038] In this article, specific examples are used to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. The above are only the preferred implementation manners of this application. It should be noted that due to the limitation of literal expression, and objectively there are infinite specific structures. For those of ordinary skill in the art, without departing from the principle of this invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, shall all be regarded as the protection scope of this application.

Claims

1. A calibrator for calibrating a time relay (410) in an out-of-phase protection circuit; the protection circuit includes a time relay (410) and three trip coils (420); the three trip coils (420) are respectively used to control the three-phase disconnection of the circuit breaker; for each phase of the circuit breaker, a pair of normally open contacts (430) are taken in parallel, and a pair of normally closed contacts (440) are taken in parallel; the normally open contacts (430) and the normally closed contacts (440) are connected in series with the time relay (410) to control the energization of the coil of the time relay (410), characterized in that, It includes a workbench (100) and a power supply module (200); a timer (300) is provided on the workbench (100); a pair of start-stop contacts (310) and a pair of stop-stop contacts (320) are provided on the timer (300); the output terminals of the power supply module (200) are connected in parallel with a first wiring terminal (210) and a second wiring terminal (220); a first switch (110) is provided between the first wiring terminal (210) and the power supply module (200); a second switch (120) is provided between the second wiring terminal (220) and the power supply module (200); a pair of auxiliary contacts (121) are further provided on the second switch (120); the auxiliary contacts (121) are connected to the start-stop contacts (310); the stop-stop contacts (320) are configured to be connected to the normally closed auxiliary contacts (450) of the B / C phases of the circuit breaker; the start-stop contacts (310) are configured to be connected to the normally closed auxiliary contacts (460) of the A phase of the circuit breaker; When the calibrator is in testing, it includes the following steps: Initialization, close all three phases of the circuit breaker, turn on the power supply of the protection circuit, and set the action duration T of the time relay (410); Next, close the first switch (110), and record the display duration T1 of the timer (300). T1 is the duration from the disconnection of the A phase of the circuit breaker to the disconnection of the B and C phases; Next, close all three phases of the circuit breaker; Next, close the second switch (120), and record the display duration T2 of the timer (300). T2 is the duration from the B / C phases of the circuit breaker receiving the trip command to completing the trip; Next, obtain the non-full-phase protection action delay T3 by T1 - T2; Next, complete the calibration by comparing T3 with T.

2. The calibrator according to claim 1, wherein The first wiring terminal (210) is configured to be electrically connected to the trip coil (420) of the A phase.

3. The calibrator according to claim 1, wherein The second wiring terminal (220) is configured to be electrically connected to the trip coil (420) of the B / C phases.

Images