KR0159459B1 - Method and control device for gas insulated switch - Google Patents

Abstract

The present invention detects the ground (leakage) current or inrush current inflow state of three-phase currents (R phase, S phase, T phase current) flowing into the gas insulated circuit breaker, and displays the current peak value by indicating the current peak value and the fault details of each phase. The present invention relates to a gas insulated load switch control device and method for causing the load switch to be controlled by a trip control operation of a user who recognizes a case in which a failure occurs by using the display means. The characteristic configuration includes a plurality of level detecting means for detecting levels of three-phase current at the left and right terminals of the relay, a plurality of rectifying means for rectifying the output signals of the respective level detecting means, respectively; A constant current supply means for supplying a constant operating current to each part of the circuit using the output signal of the rectifying means, and a battery used as an auxiliary power supply Battery charging means for charging the battery, Battery measuring means for measuring the battery's output level by measuring the output level of the battery, Trip relay opening and closing means for allowing the user to arbitrarily control the operation of the breaker remotely or on site The input current reference value setting means for the user to arbitrarily set the reference value of the three-phase current, the reference value of the ground current, and the inrush current delay allowance time, set the trip operation to automatic / manual, convert the digit display contents, and set the initialization operation. Key input means to display the peak value of the three-phase current in digits, display means for indicating which phase current is the current peak value currently displayed in digits, or for displaying a fault current phase current, an externally set allowable reference value and the current By comparing the input three-phase current with digital pulse, It is composed of the main control means which returns to the initial state automatically by time or by external setting at the time of normal current recovery while controlling the corresponding fault line indication lamp according to the selection result of automatic / manual trip. The method of control method of load switch is to set random reference value for three-phase current flowing into the circuit breaker, store it in RAM, read analog three-phase current into digital pulse, display the current peak value, and drive the corresponding line current display lamp. And a second step of driving the corresponding fault line indication lamp when the three-phase current read in the first step is larger than the reference value and the phase current delay time is larger than the inrush current delay allowable time reference value. The ground fault current of the three-phase current read in step 1 is higher than the ground fault current If the current delay time is longer than the inrush current delay allowance time, it is judged as the leakage current, and the trip automatic / manual selection key is checked after performing the third and third steps of driving the corresponding fault line display lamp. If it is selected automatically, drive the auto mode display lamp to indicate the auto mode driving relay and auto trip mode, then recover to normal current and return to the initial state after a certain period of time. A fourth step of returning to the initial state according to whether the initialization setting operation by the user while driving the manual mode display lamp.

Description

Gas insulation load switch control device and method

1 is a block circuit diagram showing an embodiment of a gas insulated load switch control device according to the present invention.

Figure 2 is a flow chart showing an embodiment of the gas insulation load switch control method according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: constant current IC 12: battery charging IC

13: battery level measurement IC 14: digit display unit

15: line current display unit 16: fault line display unit

17: Battery charge / discharge display unit 18: Automatic / manual trip mode display unit

20: microprocessor RY1 to RY8: relay

PT1 to PT10: Potential transformer BD1 to BD10: Bridge circuit

DS1: Phase current setting unit DS2: Ground current setting unit

DS3: Inrush current delay allowable time setting part PB1 ~ PB3: Relay control button

PB4: Lamp test button PB5: Reset key

PB6: Digit display conversion key D1 to D19: Diode

SW1: Field / Remote selection key SW2: Auto / Manual trip selection key

L1 to L20: Light emitting diodes C1 to C6: Condenser

RY1-a to RY8-a: normal open terminal RY1-b to RY8-b: normal short terminal

The present invention relates to a gas insulated load switch control device and a method thereof, and more particularly, a three-phase current (R phase, S phase) flowing into a gas insulated circuit breaker filled with a gas (for example, SF6) to prevent sparks. It detects the ground (leakage) current or inrush current inflow state of phase and T phase current by digital pulse and displays its current peak value and displays the fault contents of each phase to the outside by using each display means. The present invention relates to a gas insulated load switch control device and a method for controlling a load switch by a trip control operation of a user who recognizes a case.

In general, a circuit breaker is a device that automatically cuts off a large power circuit or automatically cuts off a circuit in order to prevent damage to a device when the circuit is in danger. This circuit breaker is used to cut off the current in case of an accident such as an electric relay, which is connected to the main circuit by a small change of the input current or a connection change. It is provided to act to open and close the circuit according to the operation of the switching contact (movable iron piece).

Among them, in the conventional gas-insulated load switch control device, a CMOS IC or a TTL IC is used to receive a current from the electric pole flowing hundreds of amps through a current / voltage converter that performs a current / voltage conversion operation and a voltage drop operation. The operation of a number of relays was controlled.

However, the conventional circuit breaker as described above can be controlled only at the site of the electric pole, so the user must go up the electric pole every time to find out the problem and control the operation of the circuit breaker, and also use a plurality of CMOS ICs or TTL ICs. Since the operation of a plurality of relays are controlled, there is a problem that the circuit becomes very complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to set a reference value of the phase current, ground fault current, and inrush current delay allowable time of a three-phase input current that a circuit breaker can allow. By using the reference value, the microprocessor detects the input state of the three-phase current by digital pulse and judges it when the door is opened. In addition, the present invention provides a gas insulated load switchgear control device and a method for allowing a user to easily recognize a fault of a breaker from the outside and control a trip relay according to the result.

Features of the gas insulated load switch control device according to the present invention for achieving the above object is a plurality of level detection means for detecting the level of the three-phase current at the left and right terminals of the relay, respectively, and each level detection A plurality of rectifying means for rectifying the output signal of the means, a constant current supply means for supplying a constant operating current to each part of the circuit using the output signal of the rectifying means, and for charging the battery used as an auxiliary power source Battery charging means, Battery measuring means for measuring the output level of the battery to display the charging / discharging state, Trip relay opening and closing means for allowing the user to arbitrarily control the operation of the breaker in the remote or field, and the reference value of the three-phase current Input current reference value for user to arbitrarily set the reference value of over-current and inrush current delay allowable time The setting means, the key input means for setting the trip operation to automatic / manual, converting the digit display contents, and setting the initialization operation, the peak current of the three-phase current in digits or the current peak value currently displayed in digits The display means for displaying the recognition or displaying the current fault current phase, and the externally set allowance value and the currently input three-phase current are compared with digital pulses to determine the fault condition by itself and according to the automatic / manual trip selection result. It is composed of main control means to return to initial state automatically by time or by external setting at the time of normal current recovery while controlling fault line display lamp.

Characteristic of the gas insulated load switch control method according to the present invention for achieving the above object is to set an arbitrary reference value for the three-phase current flowing into the circuit breaker to store in the RAM and to read the analog three-phase current converted into digital pulse If the three-phase current read in the first step is larger than the reference value and the phase current delay time is larger than the inrush current delay allowable time reference value, the fault is judged to be a failure. If the ground current of the three-phase current read in the first step is larger than the ground current value and the ground current delay time is longer than the inrush current delay allowance time, the fault line display lamp is judged as a leakage current. Trip after performing the third step of driving the fault line display lamp and the second or third step If the auto / manual selection key is checked and selected automatically, drive the auto mode display lamp to indicate the auto mode driving relay and auto trip mode, and then recover to normal current and return to the initial state after a certain period of time. In the fourth step of returning to the initial state according to the initialization setting operation by the user while driving the manual mode display lamp indicating the manual trip mode.

Hereinafter, a preferred embodiment of a gas insulated load switch control device and a method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block circuit diagram showing an embodiment of a gas insulated load switch control device according to the present invention. As shown in the drawing, the level detecting means for detecting the level of three-phase current at the left and right terminals of the relay is shown. A current / voltage converter (CT1 to CT3) for lowering and converting a large power current to a low voltage at the right terminal of the relay, and a plurality of potential transformers (PT1 to PT10) having a plurality of intermediate taps, The rectifying means for rectifying the output signal of the level detecting means is composed of bridge circuits BD1 to BD10 composed of a plurality of bridge diodes, and supplies a constant operating current to each part of the circuit using the output signal of the rectifying means. By detecting the output level of the battery charging means and the battery to charge the battery used as a constant current supply means and auxiliary power The battery measuring means for displaying the charging / discharging state of the battery while maintaining a constant operating current value (350㎃ ± 10%) during battery charging and discharging is a constant current IC (11), a battery charging IC (12), and a battery level measuring IC ( 13), and the input current reference value setting means is a dip switch in which the user can arbitrarily set the reference value of the three-phase (R phase, S phase, T phase) current, the reference value of the ground current, and the inrush current delay tolerance time. Phase current setting unit DS1 for setting the reference value of the three-phase current, ground current setting unit DS2 for setting the reference value of the ground current, and inrush current delay allowance for the user to arbitrarily set the inrush current delay tolerance time. Preferably, the time setting unit DS3 is configured. The key input unit is a plurality of push buttons and a slide switch, and includes an automatic / manual selection key SW2 for setting the trip operation to automatic / manual, and a digit display unit.The digital display conversion key (PB6) capable of arbitrarily converting the contents being displayed again and the reset key (PB5) for setting the initialization operation of the system are preferable. A digit display section 14 using an LCD capable of displaying digits, a line current display section 15 made up of respective light emitting diodes for indicating which phase current is the current peak value currently displayed in digits, and a current fault Fault line display section 16 made up of respective light emitting diodes for displaying the phase current lines, battery charge / discharge display section 17 for displaying the charge / discharge state of the battery, and automatic for indicating the automatic / manual mode. / Manual trip mode display unit 18 is preferable, and the main control means compares the externally set reference value with the current input current by a digital pulse to determine the failure state. It is composed of a microprocessor 20 which judges automatically and controls the corresponding display device according to the selection result of automatic / manual trip, automatically returning to the initial state by the time of recovery of normal current or manually by the external setting state. Preferably, the trip relay opening and closing means for the field / remote selection key (SW1) and a plurality of relays (RY1 ~ RY6) for driving the motor and the relay drive to enable the user to arbitrarily control the operation of the motor in the remote or field It is preferable to configure the push buttons PB1 to PB3 and the lamp test key PB4 for the lamp test.

2 is an operation flowchart showing an embodiment of a gas insulated load switch control device according to the present invention. As shown in the drawing, the first step reads an arbitrary reference value for an allowable range of three-phase current flowing into a breaker. Storing in the RAM (S11), reading the analog three-phase current flowing into the circuit breaker through the current wire (S12) and converting it into digital pulses, and displaying the current peak value converted into digital by using an LCD, etc. While driving the corresponding line current display lamp (S13), it is preferable that the second step includes determining whether the three-phase current read in the first step is greater than the reference value (S14), and the phase current delay time starts. In step S15, it is determined whether the current delay allowable time is larger than the reference value, and the three-phase current read in the first step is larger than the reference value and the phase current delay time is allowed to inrush current delay. If it is greater than the time reference value, it is preferable that the step S16 is performed to determine the fault and drive the corresponding fault line display lamp. In the third step, it is determined whether the ground current of the three-phase current read in the first step is greater than the ground current reference value. Determining (S17), determining whether the ground current delay time is longer than the inrush current delay allowance time (S18), and the ground current of the three-phase current read in the first step is greater than the ground current reference value and the ground current delay When the time is longer than the inrush current delay allowable time, it is preferable that the step S19 is performed to determine the leakage current and to drive the corresponding fault line display lamp, and the fourth step is automatically performed after performing the second or third step. Checking the manual trip selection key (S20), and if the automatic / manual selection key is automatically selected, the automatic mode driving relay and the automatic mode indicating the automatic mode are displayed. Driving the display lamp (S21), determining whether to recover to normal current (S22), checking whether a predetermined time has elapsed after recovering normal current, and returning to an initial state (S23), and automatic / manual Step S24 of driving the manual mode display lamp to indicate that the manual mode is selected if the selection key is manually selected, and it is determined whether the initialization setting operation by the user is performed (S25) to return to the initial state depending on whether the external setting (S25) It is preferred to consist of).

Referring to the configuration as described above will be described the operation of the gas insulated load switch control device according to the present invention.

First, the user uses the dipswitches of the phase current setting unit DS1, the ground current setting unit DS2, and the inrush current delay allowable time setting unit DS3, which are input current reference setting means, to allow the three-phase current to flow into the circuit breaker. Accordingly, an arbitrary reference value is set. When the power is turned on in this state, the microprocessor reads a random reference value for the allowable range of the three-phase current flowing into the breaker and sets the reference values (phase current, ground current and inrush current delay allowance time) required for its comparison operation. It is stored in the RAM as a means (S11), and then the current flowing into the circuit breaker through the current / voltage converter (CT1 to CT3) from the current line and rectified output from the transformer (PT7 to PT10) and the bridge circuit (BD7 to BD10) Read the three-phase current of the digital conversion (S12), and displays the peak value of the digitally converted phase current numerically on the digital display unit 14 using an LCD or the like, and at the same time the current peak value is displayed 15 For example, when the R-phase current of the three-phase current maintains the peak value, the line current display unit emits light emitting diode L13 that displays the R-phase current line. The first step of driving (S13) is performed.

Subsequently, the microprocessor 20 checks whether the three-phase current read in the first step is greater than the reference value (S14) and checks whether the phase current delay time is greater than the inrush current delay allowable time reference value (S15). If the read three-phase current is larger than the reference value and the phase current delay time is larger than the inrush current delay allowable time reference value, the second step of determining that the corresponding phase current input line is a failure and driving the display lamp of the corresponding failure line display unit 16 (S16). In addition, the microprocessor 20 checks whether the ground current of the three-phase current read in the first step is greater than the ground current reference value (S17) and checks whether the ground current delay time is longer than the inrush current delay tolerance time ( S18) when the ground current of the three-phase current read in the first step is larger than the ground current reference value and the ground current delay time permits inrush current delay. If longer is the determination is made that the leakage current in the line and performs the third step of the failure display lamp driving (S19) of the line display unit 16.

Next, the microprocessor 20 checks the automatic / manual trip selection key (SW2) after performing the second or third stages of sounding, and if the automatic / manual trip selection key is automatically selected (Y branch of S20). While driving (S21) the automatic mode driving lamps (L7 to L5) indicating the automatic mode driving relay (RY7) and the automatic trip mode, it is determined whether the normal current has been restored (S22). After checking for a certain period of time (S23), it returns to the initial state after a certain period of time has elapsed.If the automatic / manual trip selection key (SW2) is manually selected (N branch of S20), the manual mode driving relay ( A fourth step of determining whether an initialization setting operation is performed by a user externally while driving the manual mode display lamps L6 to L8 indicating RY8) and the manual trip mode (S25) and returning to the initial state according to the determination result; Can It is.

And the operation of the microprocessor as described above may be selectively performed in the circuit breaker installed around the perimeter or the circuit breaker installed below the pole according to the selection result of the field / remote selection key (SW1) by the user of the trip relay control means Through the potential transformers PT1 to PT6 and the bridge circuits BD1 to BD6, a constant level of current is supplied to each part of the circuit, the constant current IC 11, the battery charger IC 12, and the battery measuring IC 13, respectively. The control operation of the relay for the circuit breaker trip can be performed, and all the display lamps of each part can be driven depending on whether the lamp test button PB4 is selected.

In addition, all the display operations as described above are operated only in the microprocessor when the door of the breaker is closed, and all the operation display is possible when the door of the breaker is open.

As described above, the gas insulated load switch control device according to the present invention detects a three-phase current using a current / voltage converter, converts it to digital, and compares the result with a reference value in a digital manner using a microprocessor. The display operation can be performed by recognizing the current value and the fault condition according to the condition, and it is easy to determine whether the three-phase current line is broken. Also, the trip relay control operation can be performed in the field, remotely or automatically. Having a key to choose whether or not to do so is useful for the user to easily control the trip relay of the breaker under the telephone pole or by the microprocessor's own operation.

Claims (6)

A plurality of level detecting means for detecting the level of the three-phase current at the left terminal and the right terminal of the relay, a plurality of rectifying means for rectifying the output signal of each level detecting means, respectively, and the output signal of the rectifying means Constant current supply means for supplying a constant operating current to each part of the circuit, battery charging means for charging the battery used as an auxiliary power source, and battery for measuring the output level of the battery to display the battery's charge / discharge status. Measurement means, trip relay opening and closing means allowing the user to arbitrarily control the operation of the breaker, input current for the user to arbitrarily set the reference value of the three-phase current, the reference value of the ground current, and the allowable inrush current delay time. Set the reference value setting means, trip operation to automatic / manual, change the digit display contents, and initialize. Key input means for setting the operation, display means for displaying the peak value of the three-phase current in digits, indicating which phase current is the current peak value currently displayed in digits, or displaying the fault current of the phase current; And the current input three-phase current are compared with digital pulses to determine the fault condition by itself and control the corresponding fault line indication lamp according to the automatic / manual trip selection result. Gas-insulated load switchgear control device characterized in that the main control means for manually returning to the initial state. The dimming switch according to claim 1, wherein the input current reference value setting means is a dip switch that allows the user to arbitrarily set the reference value of the three-phase (R phase, S phase, T phase) current, the reference value of the ground current, and the inrush current delay tolerance time. Phase current setting unit DS1 for setting the reference value of the phase current, ground current setting unit DS2 for setting the reference value of the ground current, and inrush current delay allowable time setting for allowing the user to arbitrarily set the inrush current delay allowable time. Gas insulated load switchgear control device characterized in that consisting of (DS3). 2. The apparatus as claimed in claim 1, wherein the key input means is a plurality of push buttons and slide switches, the automatic / manual selection key (SW2) for setting the trip operation to automatic / manual, and the contents currently displayed on the digit display means. A gas insulated load switch control device comprising a digit display conversion key (PB6) that can be arbitrarily converted and a reset key (PB5) for setting an initialization operation of the system. 2. The display device according to claim 1, wherein the display means includes a digit display section 14 using an LCD capable of displaying each phase current peak value of three-phase current, and a phase current for indicating which phase current is the current peak value currently displayed in digits. A line current display unit 15 made of light emitting diodes, a fault line display unit 16 made of respective light emitting diodes for displaying a faulty phase current line, and a battery charge / discharge state for displaying a charge / discharge state of a battery. And a discharge display unit (17) and an automatic / manual trip mode display unit (18) for indicating the automatic / manual mode. According to claim 1, wherein the trip relay opening and closing means is a field / remote selection key (SW1) and a plurality of relays (RY1 to RY6) for driving the motor to allow the user to arbitrarily control the operation of the motor at a remote or site A gas insulated load switch control device comprising a push button (PB1 to PB3) for relay driving and a lamp test key (PB4) for lamp testing. A first step of setting an arbitrary reference value for the three-phase current flowing into the circuit breaker, storing it in the RAM, converting the analog three-phase current into a digital pulse, and then driving the corresponding line current display lamp while displaying a current peak value; If the three-phase current read in step 1 is larger than the reference value and the phase current delay time is larger than the inrush current delay allowable time reference value, the second step of driving the corresponding fault line display lamp is determined as a failure, and the three-phase current read in the first step. If the ground fault current is greater than the ground current reference value and the ground current delay time is longer than the inrush current delay allowance time, the third step of driving the corresponding fault line display lamp and performing the second step or the third step are determined as leakage current. After checking the trip auto / manual selection key, if it is selected automatically, auto mode drive relay and auto trip mode Initial mode of operation by the user while driving the manual mode display lamp which indicates the manual trip mode when the automatic mode display lamp is displayed and recovers to normal current after a certain time and manual selection is selected. Gas insulation type load switch control method comprising the step of returning to the initial state depending on whether or not.