KR200268296Y1 - Portable Circuit Breaker Tester - Google Patents

Abstract

The present invention relates to a portable circuit breaker tester for testing the operation characteristics of the circuit breaker and switch of the power system.

The portable circuit breaker tester of the present invention for testing the operation characteristics of the circuit breaker and switchgear, which is a power system element, to safely cut off or insert the power system in the event of a power system accident and a power system accident. It is essential for testing the operation characteristics of the equipment under test by electric power companies such as companies, KEPCO, etc., but until now, expensive test equipment has been introduced and used, and TA-2000 (Kinkei, Japan), a foreign-introduced tester, is used for circuit breakers. And display and display device (LCD) and storage device for functions such as time signal display and recording of circuit breaker, measurement and recording of current waveform of operation coil or driving motor, test of circuit breaker's switching characteristic, etc. Dedicated S-RAM card) and printer.

The portable circuit breaker tester of the present invention, in addition to the functions of the TA-2000, automated measurement of the main contactor resistance of the circuit breaker under test and the presence or absence of the resistance contactor, the contact failure evaluation, communication with a computer, the use of a general storage medium (FDD), and the use of Korean It is fully digitalized to realize the computer analysis program and the operation of the environment (menu type operation by 4 keys).

The portable circuit breaker tester of the present invention is a power supply device, a CPU which is a central processing unit, a voltage / current detection circuit for detecting the voltage and current of the circuit breaker and the input element, and the contact resistance of the main contactor of the circuit breaker. Main contact state detection circuit for detecting state, auxiliary contact state detection circuit for detecting state of auxiliary contactor of circuit breaker under test, analog signal input circuit for digitizing analog signal, auxiliary contact and operation switch contact signal of circuit breaker under test Digital signal input circuit for digitizing the signal, digital signal output circuit for triggering the output voltage selection relay and the output voltage selection relay according to the command of the CPU, power switch, output voltage selection switch, input switch, disconnect switch, stop Switch panel and liquid crystal display device equipped with switches such as switches Includes accessory devices such as drive circuits, printer drive circuits, semiconductor memory devices, key controllers, communication controllers, FDDs, LEDs, etc. and clamp programs, and software programs for analyzing test data in personal computers. This circuit breaker tester is portable to the site, detects the conduction current and voltage drop between the primary and secondary contacts of the circuit breaker under test, measures the contact resistance, and automatically evaluates the presence or absence of a resistance contactor and contact failure. In order to analyze the test / measurement data of the circuit breaker under test and download the setting data (Down Load) by using the operation program of Korean environment in personal computer, it is equipped with FDD and communication controller of general type. Characterized in that configured.

According to the localized development of the breaker tester according to the present invention, it is possible to replace expensive foreign test equipment in the breaker operation characteristic test and secure measurement technology based on reliability.

Description

Portable Circuit Breaker Tester

The present invention relates to a portable circuit breaker tester dedicated to the operation of a circuit breaker and a disconnecting switch of a power system, and measures and tests for testing electrical characteristics of a power facility. TECHNICAL FIELD OF THE INVENTION

The breakers and switchgear under test are the elements of the power system to safely cut off or input the power system in case of power supply switching operation and power system accident. Therefore, circuit breaker operation tester is an essential tester to test the operation characteristics of the equipment under test in heavy electric manufacturers, KEPCO and others who manufacture or use power circuit breakers and switchgear.

The tester used in Korea such as Korea Electric Power Corporation as a breaker tester is TA-2000 (Circuit Breaker / Disconnecting Switch Tester, 1991) manufactured by Kinkei (Japan), and TCM915S of AVO International (UK), which is used to test relay operation characteristics. (Timer-Control-Monitor Unit) and TA320 (Time Interval Analyzer) of Yokogawa Electric (Japan), which are used to test the rotational characteristics of a rotating body, are similar technologies / products in that they display the operating time of power equipment.

A brief description of the technology / product is as follows:

TCM915S has the function to record the operation status and operation time while applying sequential control input to the equipment under test, and the power system protection relay test used to test or simulate the operation characteristics such as distance relay and reclosing relay. It features 15 channels of input, 9 channels of output, PULSAR Relay Test System and linked operation with GPS6500 Satellite Receiver TTL Trigger.

The TA320 measures and evaluates the waveform and period of the pulse.It is used for vehicle engine duty measurement, rotation jitter measurement, and encoder bad slit detection. It also features transient response display and statistical analysis.

TA-2000 is a circuit breaker tester.

-Function: Time signal of circuit breaker and recording, Measurement and recording of current waveform of operation coil or driving motor, Test of opening and closing characteristics of circuit breaker

-Setting items: date / time / device number / diary status, temperature (-10 ~ 50 ℃), humidity (0 ~ 99%), current measurement range selection (10A / 50A), resistance contact operation, chattering time Whether and whether the current waveform is printed

-Test items: open / close operation measurement (breaker 0.0 ~ 999.9ms, switch 0 ~ 9999ms), trip free characteristic test, high speed reclosing characteristic test, current measurement (0 ~ 10A / 50A) and minimum operating voltage test

-Printing: Measurement of opening and closing operation, Trip Free characteristic test, High speed reclosing characteristic test result

System configuration: See FIG. 2 (Configuration diagram of a conventional portable circuit breaker tester).

-Advantages: open / close operation record, resistance contact operation check, clamp CT (optional), test data storage, thermal line dot printer

The TA-2000 is a circuit breaker tester similar technology / product to the circuit breaker tester of the present invention, but may point out the following.

-Need to automate the presence of resistance contacts and poor contact evaluation

-Add communication function with computer

-Add general storage media

-Need localization of usage environment

-Simplify operation

It is a technical task of the present invention to develop a tester with a new configuration that improves the pointed point about the TA-2000. In other words, the portable circuit breaker tester of the present invention shows a function and performance equivalent to that of the TA-2000, but the system is configured to have the following advantages over the TA-2000.

-Automation of presence or absence of resistance contactor: Main contactor resistance measurement (0∼1000Ω ± 2.5%)

-Add communication function with computer: serial communication (RS 232/485)

Addition of common storage media: FDD 3.5 '

-Korean language of use environment

-Simple operation: Minimize setting items, menu type operation by 4 keys

-Technology for fully digitalization of tester such as high speed digital data acquisition / processing technique, high precision effective value computation technique

Table 1 below is a detailed comparison of the specifications of the portable circuit breaker tester and the conventional circuit breaker tester according to the present invention in detail the technical problem to be achieved by the present invention.

TABLE 1

Comparison table of portable circuit breaker tester of this invention with conventional tester

1 is a block diagram of a portable circuit breaker tester according to the present invention.

2 is a block diagram of a conventional portable circuit breaker tester.

<Description of Symbols for Major Parts of Drawings>

01: Terminal Block 02: Operation Switch Panel

03: power control circuit 04: variable voltage power supply

05: Digital I / O Circuit Power Supply 06: Processor Power Supply

07: Central processing unit (CPU) 08: Bus

09: voltage selection relay 10: voltage / current detection circuit

11: output selection relay 12: digital signal output circuit

13: main contact state detection circuit 14: analog signal input circuit

15: auxiliary contact state detection circuit 16: digital signal input circuit

17: LCD driving circuit 18: printer driving circuit

19: memory device 20: key controller

21: Communication Controller 22: FDD

31: terminal block 32: power supply operation circuit

33: internal power supply 34: 110V test power switch

35: current measuring circuit 36: open / close test output switch

37: variable power supply device 38: voltage measurement circuit

39: contact power supply device 40: contact input circuit

41: LED for output display 42: LED for contact status display

43: CPU 44: Bus

45: operation key 46: LCD display device

47: memory card (S-RAM) 48: printer

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a portable circuit breaker tester according to the present invention.

1, 01 is a terminal block, 02 is a control switch panel, 03 is a power control circuit, 04 is a variable voltage power supply, 05 is a digital input / output circuit power supply, 06 is a processor power supply, 07 is a central processing unit ( CPU), 08 is bus, 09 is voltage selection relay, 10 is voltage / current detection circuit, 11 is output selection relay, 12 is digital signal output circuit, 13 is main contact state detection circuit, 14 is analog signal input Circuit, 15 is auxiliary contact state detection circuit, 16 is digital signal input circuit, 17 is LCD driving circuit, 18 is printer driving circuit, 19 is memory element, 20 is Key Controller, 21 is Communication Controller ) Respectively.

In Figure 1, the terminal block 01 is a terminal for the electrical connection between the portable circuit breaker tester and the external device of the present invention,

The P-terminals of the power terminals (P, N, E) are connected to the positive pole of the DC 110V power supply, the N-terminal is connected to the negative pole of the DC 110V power supply, and the E-terminal is connected to the ground electrode, so that the internal power and the test power can be supplied. Each is a capacity capable of flowing a short time current of 50 A or more;

N-terminal of test power output terminal (N, T, C) is negative of trip coil and closing coil circuit of circuit breaker, T-terminal is positive of trip coil of circuit breaker, C-terminal is Connected to the anodes of the input coils of the circuit breakers, respectively, to apply the output current of the power supply control circuit 03 or the variable voltage power supply unit 04 to the trip or input coil to open or close the circuit breaker;

The R-, S-, and T- terminals of the main contactor input terminals (R, S, T, and G) are R-, S-, and T-, respectively, which are the main contactor terminals (normally the 3-phase breaker secondary terminals) of the circuit breaker under test. Connected to the terminal, and the G-terminal is connected to the main contactor terminal (typically a 3-phase breaker primary terminal) grounded collectively for testing, starting from the negative terminal of the digital input / output circuit power supply (05), and the G-terminal, R A closed loop leading to the positive pole of the / S / T-terminal, the main contact state detection circuit 13, and the digital input / output circuit power supply unit 05 to measure the main contact state (open, closed, contact resistance);

Auxiliary contact input terminals _{(A 1, A 2, A} 3, A 4, G) of the _{A 1 -, A 2 -,} A 3 -, A4- terminal is connected to the auxiliary contact that indicates the state of each of the test circuit-breaker, G The terminal is the co-terminal of the auxiliary contact.

In FIG. 1, the power supply control circuit 03 includes an electronic switch, an overcurrent protection circuit, and a reverse current prevention circuit that are opened and closed by a 'power switch' of the operation switch panel 02. The terminal block 01 The DC 110V power flowing through the power terminals (P, N, E) of the power supply) safely and open and close, variable voltage power supply (04), digital input and output circuit power supply (05), processor The power supplied to the power supply unit 06 and the voltage selection relay 09 is interrupted.

In FIG. 1, the variable voltage power supply 04, the digital input / output circuit power supply 05, and the processor power supply 06 are respectively provided for supplying power to a variable test power output, a digital input / output circuit, a processor, and a peripheral device. As a DC / DC converter, the variable voltage power supply 04 varies the voltage of DC 110V to DC 30 to 85V so that the test power output terminals N, T, and C of the terminal block 01 are changed. The test voltage is applied to the trip coil or the input coil of the circuit breaker connected to the circuit), and the variable voltage level and current level are detected by the voltage / current detection circuit 10, and the output of the digital input / output circuit power supply unit 05 is It is connected to the main contact state detection circuit 13 and the auxiliary contact state detection circuit 15 and its voltage level is detected by the main contact state detection circuit 13, and the output of the processor power supply unit 06 is the CPU (07). Connected to the internal power and peripheral power including All.

In Figure 1, the CPU 07 is a central processing unit, the system OS program of the portable circuit breaker tester of the present invention, various measurement / test algorithms (opening and closing operation measurement, voltage / current measurement, contact resistance measurement, Trip Free characteristic test, high-speed re- Closed Characteristic Test, Minimum Operating Voltage Test), Various Input / Output Interface (M / I) Program and Man-Machine Interface (MMI) Program are built-in, and interconnected with various interfaces and peripheral devices connected to the bus (08) It receives data / commands and manages the system according to user's instructions through MMI.

In FIG. 1, the voltage / current detection circuit 10 detects the voltage and current of the test power output from the power supply control circuit 03 or the variable voltage power supply 04, insulates and amplifies the signal, and adjusts the voltage to a level of 0 to 5V. The signal is output to the analog signal input circuit 14, the current is detected by a Hall sensor, a shunt resistance, and the voltage is detected by a voltage divider.

In FIG. 1, the main contact state detection circuit 13 outputs the digital input / output circuit power supply 05 to the main contactor of the circuit breaker through the main contactor input terminals R, S, T, and G of the terminal block 01. When applied, the current and the voltage drop flowing are detected in the same manner as in the voltage / current detection circuit 10, and signal isolated and amplified to output a signal having a level of 0 to 5V to the analog signal input circuit 14.

In FIG. 1, the auxiliary contact state detection circuit 15 outputs the auxiliary contact input terminals A ₁ , A ₂ , A ₃ , A ₄ , and G of the terminal block 01 to the output of the digital input / output circuit power supply 05. When applied to the auxiliary contactor indicating the state of the circuit breaker, the voltage level according to the open or closed state of the auxiliary contactor is detected and the voltage signal of 0 to 5V level after the signal insulation by photodiode or the like is applied to the digital signal input circuit. Output to (16).

In FIG. 1, the analog signal input circuit 14 receives a voltage signal having a level of 0 to 5 V, which is an output signal of the voltage / current detection circuit 10 and the main contact state detection circuit 13, to an analog to digital converter (ADC). And digitize the data on the data bus 08.

In FIG. 1, the digital signal input circuit 16 receives an output signal of the auxiliary contact state detection circuit 15 and a voltage signal of 0 to 5V level, which is a switch contact output signal of the operation switch panel 02, through a logic circuit. It is digitized and placed on the data bus 08.

In FIG. 1, the digital signal output circuit 12 converts a voltage value of 0 to 5V level through a logic circuit to a digital value which is a command value of the CPU 07 coming up on the data bus 08, thereby outputting the relay 11. To the voltage selection relay 09 to trigger the relay.

In FIG. 1, the operation switch panel 02 is a switch panel including a power switch, an output voltage selection switch, a close switch, a trip switch, and a test stop switch. Is switched to 'ON' or 'OFF' to turn on or off the electronic switch of the power supply control circuit 03 to interrupt the power supply of the breaker tester of the present invention, and the output voltage selector switch 'output voltage' is set to '110V'. Or by switching the relay contact of the voltage selection relay 09 to the power supply control circuit 03 or the variable voltage power supply 04 in accordance with the transition to 'LOW', the voltage selection relay 09 is 110V level or 30V to 85V. Output the voltage of the level,

When the input switch 'CLOSE' is turned ON, the CLOSE relay of the output selection relay 11 is excited and the breaker is turned on. When the cutoff switch 'TRIP' is turned ON, the TRIP of the output selection relay 11 is turned on. The circuit is configured to operate exclusively as the relay is energized and the breaker trips.

When the stop switch 'STOP' is turned on, the 'CLOSE' or 'TRIP' operation is stopped.

The operation of the output voltage selection switch, the input switch, the disconnect switch, and the stop switch is monitored by the CPU 07.

In FIG. 1, the LCD driving circuit 17, the printer driving circuit 18, the memory element 19, the key controller 20, the communication controller 21, and the FDD 22 are peripheral devices of the portable circuit breaker tester of the present invention. , A typical computer peripheral, briefly:

The LCD driving circuit 17 is a driver of a liquid crystal display for displaying a circuit breaker test state and measured data and a set value in a text mode. The display and input of test / measured data or set data are processed in a menu (Manu). ,

The printer driver circuit 18 is a driver of a printer for printing test / measurement data or setting data in a graphic and text mode.

The memory device 19 is a semiconductor reservoir capable of power failure compensation for storing test / measurement data or setting data.

The key controller 20 is a pad for four keys (menu key, enter key, cursor up / down key or setting data increase / decrease key) for inputting setting data,

The communication controller 21 is a communication driver for receiving test / measurement data or setting data of a personal computer and a portable circuit breaker tester of the present invention,

The FDD 22 is a Floppy Disk Drive for receiving test / measurement data or setting data of a personal computer and a portable circuit breaker tester of the present invention.

As another peripheral device, there is an LED for indicating the system status of the portable circuit breaker tester of the present invention.

According to the localized development of the breaker tester according to the present invention, it is possible to replace expensive foreign test equipment and secure measurement technology in the breaker operation characteristic test. The expected effects are divided into technical effects and economic effects as follows:

Technical effect

-Improved reliability of domestic measurement technology: Applicable even under ultra high pressure up to 765 kV

-Automated presence of resistance contact, measurement of contact resistance and evaluation of contact failure

-Addition of communication function with computer

-Adding general storage media

-Korean language of use environment

-Simple operation: Minimize setting items, menu type operation by 4 keys

-High Accuracy RMS Method: Real-time calculation of voltage and current

-Systemization technology of portable digital measuring equipment

Economic effect

-Domestic demand: KEPCO Electric Power Corporation (about 370 places including power generation and substation, power management office, power research institute),

Heavy Electric Manufacturer, Large Electricity Customer, Electric Power Equipment Maker, Research Institute, etc.

More than 300 units of total demand, more than 30 units of annual demand (estimated)

-Sales growth: 600 million won per year (20,000 won × 30 units / year)

-Substitution of import: 600,000 ＄ annually (20,000 ＄ × 30 units / year)

-Export promotion: Undecided, but international demand is expected to increase after domestic expansion.

Other effects

-Contribute to the vitalization of the high value-added industry

-Securing technology for developing other kinds of power equipment testers

-Contribution to efficiency of power system management and power quality improvement by localization and expansion of circuit breaker tester

Claims (3)

In the portable circuit breaker test apparatus used for the operation characteristic test of the circuit breaker and the circuit breaker (hereinafter referred to as circuit breaker) that interrupts the power system, the present invention operates the circuit breaker by applying test power from the circuit breaker tester to the circuit breaker driver. While measuring the voltage and current of the applied test power supply and detecting the contact state of the main contactor and the auxiliary contactor of the circuit breaker to evaluate the operating characteristics; A power supply and a power control circuit including a variable voltage power supply for applying a test voltage to the circuit breaker under test; A voltage and current detection circuit for detecting a voltage and a current of a test power applied from the power supply to the circuit breaker to be tested; A main contact state detection circuit for detecting a test current and a voltage drop applied from the power supply to the main contactor of the circuit breaker under test; And an auxiliary contact state detection circuit for detecting an open / closed state of the test subject breaker auxiliary contactor. An analog signal input circuit comprising an analog to digital converter (ADC) for digitizing a voltage level output signal of the voltage and current detection circuit and the main contact state detection circuit; A digital signal input circuit including the auxiliary contact state detection circuit and a logic circuit for digitizing the operation switch contact signal of the breaker test apparatus of the present invention; An operation equipped with a test voltage ON / OFF input switch / disconnect switch connected to the digital signal input circuit, an output voltage switch for switching a test voltage source, a stop switch for stopping test operation, and a breaker tester power switch of the present invention. Switch panel; Measurement algorithm that calculates the voltage and current of the circuit breaker driving device under test and contact resistance of the main contactor by processing the output signal of the analog signal input circuit, measurement of opening and closing operation, breaking priority characteristic test, high speed reclosing characteristic test, minimum operation Test Algorithm such as voltage test, I / O interface program, MMI (Man-Machine Interface) program is built-in, and the whole circuit breaker test device of the present invention is managed, such as receiving data and commands from peripheral devices connected to the bus. A central processing unit (CPU); A digital signal including an output selection relay for turning on / off a test voltage output according to a command of the CPU, and a logic circuit for triggering a voltage selection relay for switching a test voltage source to one of a power supply voltage and a variable voltage Output circuit; A display device driving circuit, a printer driving circuit, a memory element, an operation key controller connected to a bus bar for displaying, printing, recording, operating and communicating measurement, test data and set values of the portable interruption tester of the present invention processed by the CPU; A peripheral device including a communication controller, a floppy disk drive (FDD), and the like; And Portable breaker tester, characterized in that it comprises a software program for analyzing test data in a personal computer separately from the portable breaker tester of the present invention. The method according to claim 1, wherein the contact resistance is measured by a method of calculating the conduction current and voltage drop between the primary and secondary main contacts of the circuit breaker under test and calculating the voltage according to Ohm's Law. Portable circuit breaker tester, characterized in that configured to automatically perform the evaluation of the presence and resistance of the contact with the contact resistance. According to claim 1, FDD and communication controller which is a general type of storage medium so that the personal computer to analyze the test / measurement data of the test target breaker and download the configuration data (Down Load) by a dedicated operating program of the Hangul environment in the personal computer Portable circuit breaker tester, characterized in that the mounting.