US-12625183-B2 - Circuit breaker

US12625183B2US 12625183 B2US12625183 B2US 12625183B2US-12625183-B2

Abstract

Embodiments of the present specification relate to a circuit breaker control device, a circuit breaker, and a circuit breaker test system, in which: communication is performed with a test device in a data communication manner so as to receive, from the test device, data on information of a test signal for testing a blocking operation of the circuit breaker; a relay element of the test signal is analyzed on the basis of the data; and whether to perform the blocking operation is determined according to an analysis result, and the blocking operation is thus performed according to a determination result.

Inventors

Dong Sun Won

Assignees

LS ELECTRIC CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220314
Priority Date: 20210326

Claims (14)

1 . A circuit breaker control device, comprising: a communication unit in which communication is performed with an external test device in a data communication manner so as to receive, from the external test device, data on information of a test signal for testing a blocking operation of the circuit breaker; and a control unit in which a relay element of the test signal is analyzed on the basis of the data, and it is determined whether to perform the blocking operation according to an analysis result, and the blocking operation is thus performed according to a determination result, wherein the data is sampling data in which the test signal is sampled at 128 [Bit] by the external testing device.
2 . The circuit breaker control device of claim 1 , wherein the communication unit transmits a notification signal about a communication connection with the external test device to the control unit when communication with the external test device is established.
3 . The circuit breaker control device of claim 2 , wherein the control unit controls the operation of the circuit breaker in a first control mode until communication is established with the external test device, and when the notification signal is received from the communication unit, the first control mode is switched to a second control mode for testing the blocking operation, and the control unit controls the operation of the circuit breaker in the second control mode.
4 . The circuit breaker control device of claim 3 , wherein the first control mode is a mode for receiving detection data from a detection unit included in the circuit breaker and controlling the execution of the blocking operation according to the detection data, and wherein the second control mode is a mode for controlling the execution of the blocking operation according to the data.
5 . The circuit breaker control device of claim 1 , further comprising: a buffer unit for receiving and stabilizing the data from the communication unit and transferring the data to the control unit.
6 . The circuit breaker control device of claim 5 , wherein after receiving the entire data from the communication unit, the buffer unit transfers the entire data to the control unit.
7 . The circuit breaker control device of claim 1 , wherein the control unit determines signal information on at least one of the type, waveform, magnitude and harmonics of the test signal by using the data, and analyzes the relay element by comparing the signal information with a preset relay criterion.
8 . A circuit breaker which is installed in a switchboard, comprising: a blocking operation unit for connecting or disconnecting a circuit between a supply side for supplying electric power and a load side for receiving the electric power; a detection unit for detecting at least one of a current and a voltage of the circuit; and a blocking control unit for determining whether to perform the blocking operation depending on a detection result of the detection unit, or communicating with an external test device in a data communication manner to receive sampling data of a test signal for testing a blocking operation of the circuit breaker from the external test device, and analyzing a relay element of the test signal on the basis of the sampling data to determine whether to perform the blocking operation according to an analysis result to control the blocking operation unit according to a determination result, and wherein the external test device generates the sampling data by sampling the test signal at 128 [Bit].
9 . The circuit breaker of claim 8 , wherein the blocking control unit is wirelessly connected to the external test device to transmit and receive data.
10 . The circuit breaker of claim 8 , wherein the blocking control unit transmits and receives data by connecting the communication cable of the external test device to the input unit and communicating with the external test device by wire, and wherein the communication cable is a cable for transmitting and receiving data in which a connector connected to the input unit is formed of 4 or less pins.
11 . The circuit breaker of claim 8 , wherein the blocking control unit controls the blocking operation unit by determining whether to perform the blocking operation according to the detection result until the communication connection with the external test device is established, and when the communication connection with the external test device is established, the blocking control unit determines whether to perform the blocking operation according to the analysis result and to control the blocking operation unit.
12 . A circuit breaker test system, comprising: a test device for communicating with a circuit breaker through a wireless data communication manner or a wired data communication manner through a connection of a communication cable to generate sampling data of a test signal for testing a blocking operation of the circuit breaker and transmit the sampling data to the circuit breaker; and a circuit breaker for receiving the sampling data from the test device, analyzing relay elements of the test signal on the basis of the sampling data, and determining whether to perform the blocking operation according to the analysis result to operate according to a determination result, and wherein the test device generates the sampling data by sampling the test signal at 128 [Bit].
13 . The circuit breaker test system of claim 12 , wherein when a setting input for setting the pattern of the test signal is input, the test device generates the test signal according to the setting input, and generates the sampling data by sampling the test signal.
14 . The circuit breaker test system of claim 13 , wherein the setting input is an input signal for setting at least one of the type, waveform, magnitude and harmonics of the test signal.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a National Stage of International Application No. PCT/KR2022/003540, filed on Mar. 14, 2022, which claims priority to and the benefit of Korean Patent Application No. 10-2021-0039870, filed on Mar. 26, 2021, the disclosure of which is incorporated herein by reference in its entirety. FIELD The present specification relates to a circuit breaker in which the test of blocking operation is performed through a test device. BACKGROUND The technology underlying the present disclosure relates to a blocking operation test of a circuit breaker which is installed in a switchboard. The reliability of the operations of an air circuit breaker (ACB) and a molded case circuit breaker (MCCB) that protect a circuit against abnormal current on the load side is increasing day by day. For example, if electricity is suddenly cut off while performing an emergency operation in a hospital, the patient undergoing surgery will be at risk of life, and if electricity is suddenly cut off in a place where many servers are operating, such as a data center, the company's economic loss will be enormous. In order to prevent such accidents, the testing and inspection of the circuit breaker is carried out, and for the inspection of the circuit breaker, work is performed after a vacation period when the usage of electricity is low in the building or the safety inspection date of the electrical equipment is notified in advance. However, performing these inspections does not guarantee the maintenance worker's leave, and the number and time of circuit breaker inspections are limited, and thus, there have been problems in that it is not possible to predict failures in advance or perform regular maintenance. Meanwhile, in the related art, as illustrated in FIG. 1, the testing and inspection of a circuit breaker was performed in a wired manner in which the wired cable of a tester was connected to the controller (STU: Smart Trip Unit-ACB Controller) of the circuit breaker (ACB) through a connector. Specifically, as illustrated in FIG. 2a, the test is performed by connecting the cable of the tester to the analog input terminal of the circuit breaker in a wired connector manner, and applying an analog voltage signal corresponding to the current size forcibly from the tester through the wired cable. Herein, the connector includes a ground (GND) pin and consists of a plurality of pins such that an analog signal can be applied thereto. As such, due to the connector consisting of a plurality of pins, there is a risk that an electric spark may be generated when the cable is connected to the circuit breaker and the circuit breaker may erroneously trip. Further, in the case of the test method through a wired connection, more cables and connector pins are required in order to test a voltage relay as illustrated in FIG. 2b such that the implementation of a voltage relay test itself is limited by design. In addition, the conventional test method has a limitation in that only a single magnitude current is applied and only long-time, short-time, instantaneous and ground fault tests, which are current relay elements, are possible. Above all, a cable must be connected in order to perform a relay test., and particularly, connecting cables with circuit breakers in a switchboard site where overcurrent flows does not guarantee the stability of maintenance personnel, resulting in a problem that causes tremendous psychological stress to the maintenance personnel. SUMMARY The present specification aims to improve the limitations of the related art, and is directed to providing an exemplary embodiment that is capable of improving the limitations of the related art. Specifically, the present specification is directed to providing an exemplary embodiment of a circuit breaker control device, a circuit breaker and a circuit breaker test system that can prevent an erroneous trip due to the application of an analog signal, when the test device for the testing and inspection of a circuit breaker is connected to the circuit breaker. In addition, the present specification is directed to providing an exemplary embodiment of a circuit breaker control device, a circuit breaker and a circuit breaker test system that can remotely perform the testing and inspection of a circuit breaker. In addition, the present specification is directed to providing an exemplary embodiment of a circuit breaker control device, a circuit breaker and a circuit breaker test system in which various performance tests can be performed. In order to solve the above-described problems, the exemplary embodiment of a circuit breaker control device disclosed in the present specification includes a communication unit in which communication is performed with an external test device in a data communication manner so as to receive, from the test device, data on information of a test signal for testing a blocking operation of the circuit breaker; and a control unit