KR20040024990A - Interface apparatus of protective relay and tester - Google Patents

Abstract

PURPOSE: An interface unit of a tester for protective relay is provided to reduce the number of connection between the tester and the protective relay and perform a test process within a short period of time by connecting the protective relay to the tester. CONSTITUTION: An interface unit of a tester for protective relay includes a parameter setup unit(31), a control unit(32), an output selection unit(34), a solid-state relay output unit(36), a relay output unit(37), a power relay unit(38), and a power supply unit(39). The parameter setup unit(31) includes a plurality of switches to output particular signals. The control unit(32) recognizes test items according to a selection signal of the parameter setup unit and outputs a relay selection signal to the recognized test items. The output selection unit(34) amplifies the relay selection signal and outputs selectively the amplified signal. The solid-state relay output unit(36) includes a plurality of solid-state relays in order to connect a selection terminal of the protective relay to a test signal output terminal of the tester. The relay output unit(37) includes a plurality of relays which are on/off according to selection terminal of the control unit(32). The power relay unit(38) includes a plurality of power relays in order to apply the power of the tester to the protective relay. The power supply unit(39) converts the commercial AC power and supplies the converted power to each element.

Description

Interface device of inspection device for protective relay {INTERFACE APPARATUS OF PROTECTIVE RELAY AND TESTER}

The present invention relates to an apparatus for inspecting a protective relay, and more particularly, a protective relay that connects between a protective relay and an inspection device to allow inspection in a shorter time while reducing the number of wirings necessary for the inspection of the protective relay. It relates to an interface device of the inspection device for the test.

A protective relay is a device with a command function that cuts the part of the circuit when an abnormal condition such as a short circuit or eddy current occurs in the electric circuit. Thermometer relay to detect, power relay acting when the circuit to send power is able to send, distance relay to detect the fault position of the transmission line, differential relay acting when the primary and secondary current ratio of the transformer is abnormal This is the case with a grounding relay to signal grounding faults on transmission and distribution lines.

Since these protective relays must operate normally so that other circuits do not fail, regular checks or inspections of the protective relays are necessary.

By the way, the protective relay 2 is composed of a number of terminals, such as terminals connecting each of the R phase, S phase, T phase, N phase, on the contrary, the characteristics of the protection relay 2 (for example, overcurrent, overvoltage The inspection apparatus 1 currently used for measuring leakage current, etc. includes a terminal (AC1, AC2) for applying a test AC signal (current of 0 to 40A, voltage of 10V to 220V), and a contact for detecting completion time of detection. It consists only of terminals A and COM and power terminals L1 and L2, so that only one element can be measured at a time.

1 shows a wiring example of one measuring element of a protective relay according to a conventional inspection method.

However, the protective relay 2 has about four measuring elements per relay.

Therefore, in the conventional test of one protection relay, a connection is made by connecting a creep (CLIP) at the end of the cable between the inspection device 1 and the protection relay 2, and each phase (R phase, S phase, T phase, N phase) is connected. Time-test and instantaneous test should be done. Particularly, in case of R phase test, 6 wirings such as R phase 2 terminal, instantaneous test 2 terminal, and time limit test 2 terminal are required.In the case of S phase test, S phase 2 terminal and instantaneous test 2 terminal and time limit test are required. 6 wirings are required with 2 terminals, and 6 wirings are needed with 2 terminals of T phase, instantaneous test and 2 terminals of instantaneous test, and also with N phase 2 terminals and instantaneous test for N phase test. A total of 26 wirings are required to complete the test of one protection relay, which requires six connections for two terminals and a time-out test, and two connections for two terminals of power.

Therefore, conventionally, a lot of time was taken with 26 wirings each time one protective relay was tested, and the damage between the terminals and the terminals may occur due to a short circuit during the wiring work. There are many problems in terms of production and efficiency, such as damage to the protective relay due to incorrect wiring.

In addition, due to the numerous wiring and disconnection operations as described above, the number of protective relays that can be tested per day was limited to about 50 units, which reduced inspection efficiency.

The present invention has been proposed to solve the above problems, the purpose of which is to connect the protective relay for inspection and the inspection equipment, to inspect the mode elements of the protective relay at once, to reduce the number of wiring work to prevent incorrect wiring, It is to provide the interface device of the inspection device for protective relay which can solve the problems such as short circuit and relay break between terminals and improve the inspection efficiency.

1 is a block diagram schematically illustrating a conventional inspection method of a protective relay.

2 is a block diagram showing an application state of the interface device of the inspection device for a protective relay according to the present invention.

Figure 3 is a block diagram showing the overall configuration of the interface device of the inspection device for protective relay according to the present invention.

4 is a view showing a structural example of the operation panel portion of the interface device of the inspection device for a protective relay according to the present invention.

5 is a detailed circuit diagram of an interface device of the inspection device for protective relay according to the present invention.

6 is a detailed circuit diagram of an output unit of a solid state relay (SSR) in the interface device of the inspection device for a protective relay according to the present invention.

7 is a detailed circuit diagram of a relay output unit in the interface device of the inspection device for protection relay according to the present invention.

8 is a sequence circuit diagram showing an operating state of the interface device of the inspection device for a protective relay according to the present invention.

Explanation of symbols on the main parts of the drawings

31: parameter setting unit 32: control unit

33: LCD output unit 34: output selection unit

35: selection display

36: solid state relay (SSR) output unit

37: relay output unit 38: power relay output unit

The present invention is a configuration means for achieving the above object, in the interface device for connecting a protective relay and the inspection device,

A parameter setting unit including a plurality of selection switches for selecting an inspection item and outputting a unique signal according to on / off of the selection switch;

A controller for recognizing a test item according to a selection signal applied from the parameter setting unit and outputting a relay selection signal according to the recognized test item;

An output selection unit for outputting the relay selection signal output from the control unit in an instantaneous or timed manner according to the instantaneous or timed selection after the current amplification;

An output selection display unit which receives the relay selection signal of the current amplified controller from the output selection unit and displays the selected test item;

One end is commonly connected to the test signal output terminals AC1 and AC2 of the inspection apparatus, and the other end is connected to the output terminals connected to the R, S, T, and N phase power terminals of the protection relay and the selection signal applied through the output selection unit. A solid state relay having a plurality of solid state relays (SSR) for turning on and off the output terminal, and connecting the selection terminal of the protection relay to the test signal output terminal of the inspection apparatus in accordance with the selection signal applied from the output selection unit ( Solid State Relay) output unit;

A plurality of relays, one end of which is commonly connected to the test signal input terminals A and COM of the test apparatus, and the other end of which is connected to the temporary control terminal of the protection relay and turned on / off according to the selection signal of the controller input through the output selection unit. A relay output unit configured to connect a signal input terminal of the inspection apparatus and a selection terminal of the protection relay under control of the controller;

A power relay having a plurality of power relays having contacts connected at both ends of the test device and the power supply terminal of the protection relay, and powering the power relay on and off according to a selection signal of the control unit to apply power of the test device to the protection relay; (Power Relay) output unit;

A power supply unit converting the commercial AC power to provide the operation power to the above-described means;

Characterized in that consists of.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the interface device of the inspection device for protective relay according to the present invention will be described in detail.

2 is a view illustrating a configuration of an inspection system to which an interface device according to the present invention is applied, and the interface device 20 includes a plurality of connection terminals having one-to-one correspondence with the connection portion 1a of the inspection device 1. And a measurement target connection portion 22a having a plurality of connection terminals corresponding one-to-one with a connection portion 2a of the protective relay 2 to be measured, wherein the inspection device connection portion 21 and the inspection device ( 1) is always in a connected state through a dedicated jack (23), the measurement target connection portion 22a is connected to the protective relay (2) to be measured by a dedicated cable 24, and when the inspection is completed, Allows you to disconnect.

In FIG. 2, although the interface device 2 according to the present invention is implemented externally with the inspection device 1, it may be implemented as a built-in type which is integrally formed with the inspection device 1.

Next, FIG. 3 is a block diagram showing the overall configuration of the interface device according to the present invention for each function. The interface device includes a plurality of selection switches for selecting an inspection item, and is unique according to on / off of the selection switch. A parameter setting unit 31 which outputs a signal, a control unit 32 which recognizes an inspection item according to a selection signal applied from the parameter setting unit 31 and outputs a relay selection signal according to the recognized inspection item; An LCD section 33 for displaying an inspection state from the controller 32, an output selection section 34 for outputting the relay selection signal output from the controller 32 instantaneously or temporarily according to the instantaneous or timed selection after the current amplification; An output selection display unit 35 for receiving the relay selection signal of the controller 32 amplified by the output selection unit 34 to display the selected inspection item, and one end of the test signal of the inspection device; Are connected to the output terminals AC1 and AC2, and the other end is connected to the R, S, T, N phase power terminals of the protection relay and the output terminal according to the selection signal applied through the output selector 34. A solid state relay having a plurality of solid state relays (SSR) for turning on / off, and connecting the selection terminal of the protective relay to the test signal output terminal of the inspection apparatus in accordance with the selection signal applied from the output selection unit 34 ( Solid State Relay) output unit 36, one end is commonly connected to the test signal input terminal (A, COM) of the inspection device, the other end is connected to the instantaneous control terminal of the protection relay and through the output selection unit 34 A relay output unit including a plurality of relays turned on / off according to the input signal of the control unit 32 and connecting the signal input terminal of the inspection apparatus and the selection terminal of the protection relay under the control of the control unit 32. 37, and the above inspection Power relay having a plurality of power relays having contacts connected at both ends of the power supply terminal of the device and the power supply terminal of the protection relay, and powering the power relay on and off according to the selection signal of the control unit 32 to apply the power of the inspection apparatus to the protection relay. (Power Relay) An output section 38 and a power supply section 39 for converting a commercial AC power supply and supplying operating power to each of the aforementioned means.

Figure 4 shows an embodiment of the operation panel for the interface device according to the present invention, the LCD display 41, and the first display unit consisting of a plurality of LEDs for displaying the inspection item selection state of the protective relay to be measured ( 42), a selection unit 43 having a plurality of selection buttons for setting the inspection target items, a second display unit 43 composed of a plurality of LEDs for displaying the output state from the inspection apparatus, and a power button 45 It is made, including.

FIG. 5 is a circuit diagram showing a detailed circuit of each component of the interface device shown in FIG. 3, and the function of each component will be described with reference to this. FIG.

First, the parameter setting unit 31 includes a plurality of selection switches that are divided by selection items, and indicates whether the selection switch is selected as a change in voltage level and sends it to the control unit 32. A voltage distribution circuit formed of a combination of on / off switches is implemented. In FIG. 5, the first switch SW1 is a driving instruction switch, the second switch SW2 is a time reduction switch, and the third switch SW3 is It is a time increasing switch, the fourth switch SW4 is a volume off switch, the fifth switch SW5 is a volume on switch, the sixth switch SW6 is a switch for down-selecting a menu item, and the seventh switch. SW7 is a switch for upward selection of a menu item, and an eighth switch SW8 is a switch for selecting an instantaneous test or a timed test.

For example, when the seventh switch SW7 is ON, the NO2-1 point is 0V level, and when the sixth switch SW6 is ON, the NO2-1 point is 0.45V level, and the fifth switch SW5 is ON. At the time of ON, the NO2-1 point is changed to a 0.83V level or the like so that the controller 32 recognizes the value set by the operator.

Next, the control unit 32 is implemented as an integrated circuit having an arithmetic function and a memory function, recognizes the parameter setting value input from the parameter setting unit 31, and outputs a relay selection signal according to an internal control program, Control relay contact operation. The control operation will be described below with an example.

Next, the LCD unit 33 displays data provided from the control unit 32 and can display a control state, an inspection state, a result, and the like.

Next, the output selector 34 is a means for controlling the selection of the final output terminal connected to the inspection device 1 and the protection relay 2 according to the output signal of the control unit 32, which is controlled by two functions. .

First, when the eighth switch SW8 is ON, current flows through the resistor R44 to the transistor Q13, and conducts the transistors Q13 and Q12 in this order. Accordingly, the output value of the controller 32 is immediately enabled by applying a level of 5V to the remaining input terminals of the plurality of AND gates to which the output values of the controller 32 are respectively input through the plurality of buffers.

Secondly, when the eighth switch SW8 is turned off, the diode D12 resistor R42 only during the set time (1 to 255 seconds) by the RUN signal output from the controller 32. Then, current flows in the order of the transistors Q13 and Q12, and 5V levels are applied to the remaining input terminals of the multiple AND gates through which the output values of the control unit 32 are input through the plurality of buffers. To enable the output value of the control unit 32.

In addition, the output selector 34 amplifies the output values of the controller 32 through the buffer ICs and applies them to the output selection display unit 35.

The output selection display unit 35 includes a plurality of LEDs respectively corresponding to the outputs of the control unit 32, and corresponding LEDs are output according to the output of the control unit 32 provided by amplifying the current from the output selection unit 34. Lights up or off to display the output selection item.

In addition, the SSR output unit 36 conducts an output terminal of the solid state relay according to some output signals of the control unit 32 transmitted through the output selection unit 34, and is configured as shown in FIG. The circuit is configured for each of the R phase, the S phase, the T phase, and the N phase, and in addition, one circuit may be additionally provided.

Referring to FIG. 6, when the 5V level output from the control unit 32 is applied to the R stage, the transistor Q7 is turned on, and thus the input terminals of the solid state relays SSR1 and SSR2 are moved in the direction of the arrow. An electric current flows through the photodiode, and the light receiving element of the output terminal is conducted. Thus, the terminals AC1 and AC2 of the inspection apparatus 1 connected to the output terminal of the SSR and the terminals OR1 and OR2 of the protective relay 2 are connected.

That is, as shown on the left side of FIG. 8, the SSR output unit 36 includes a plurality of solid state relays, one end of each of the output terminals of the solid state relay having the test signal output terminals AC1, AC2), and the other end is connected to the power connection terminal (OR1, OR2, OS1, OS2, OT1, OT2, ON1, ON2, O / SP1, O / SP2) of the protective relay 2, respectively, The respective SSRs are operated in accordance with the R phase, S phase, N phase, and T phase selection signals of (32) to connect the output terminal of the inspection apparatus 1 and the power connection terminal of the protective relay 2.

Next, as shown in FIG. 7, the relay output unit 37 is connected to the connection terminals PA and NA connected to the two terminals A and COM of the inspection apparatus 1. The select terminal is connected to the remaining terminals (T, T ', INS, INS', NT, N-T ', N INS, N INS') of the protective relay 2, respectively, A plurality of relays (RY1 to RY4) circuits, which operate on output signals A-1, A-2, A-3, and A-4 to turn on the contacts, are further provided with two relays RY5 in addition. RY6) circuit.

For example, when the high level signal is output from the controller 32 to the A-1 terminal, the transistor Q1 is turned on, and current flows in the direction of the arrow to excite the relay RY1. Accordingly, the contacts of the relay are turned on so that the terminals PA and NA of the inspection device 1 and the terminals corresponding to the inspection items of the protection relay 2 are connected to each other (in this example, T and T ′). From (2), a signal is transmitted to the inspection apparatus 1.

In addition, the power relay output unit 38 is connected to the connection terminals C1 and C2 connected to the power terminals L1 and L2 of the inspection device 1 at one end of the contact, and the other end of the contact is protected. A control signal of the control unit 32 having a relay RY7 connected to the connection terminals A1 and A2 connected to the power supply terminals L1 and L2 of the relay 2 and applied through the output selector 24. And a 5V level output from the last end gate of the output selector 34, current flows in the direction of the arrow to turn on the transistor Q14 and the relay RY7. The contact is turned on, and as a result, the power output from the inspection apparatus 1 is applied to the power supply terminals L1 and L2 of the protective relay 2.

The remaining relays RY8 provided in the power relay output unit 28 are redundantly provided and function in the same manner as the relay RY7.

Finally, the power supply 39 converts the AC power 220V into a 6V AC signal through the down transformer T1, and the arrow direction is controlled by the rectifier circuit 391 made of a bridge diode and the capacitors C1 and C2. The DC voltage 8V rectified and filtered is made, and the DC voltage 539 is generated by the constant voltage unit 392 and supplied to each circuit.

In the apparatus, for example, when the operator selects the R phase in the menu, the control unit 32 recognizes this and outputs a high level signal through the seventh terminal, and the R phase selection signal is amplified by the current through the buffer. After that, the first LED LED1 of the selection display unit 35 is turned on via the B1 terminal, and is input to the R phase of the SSR output unit 36 while the AND gate is enabled. In the SSR output unit 36, as shown in FIG. 6, the transistor Q7 and the diode D7 are turned on by the high-level signal input to the R phase, and current flows to the input terminals of the SSR1 and SSR2. The light receiving element of the output terminal is turned on to connect the phase current output terminals AC1 and AC2 of the inspection apparatus to the R phase terminals R and R 'of the protective relay 2.

In the above, when the operator turns on the eighth switch SW8, the end gate of the output selector 34 is continuously enabled, so that the R phase current is temporarily applied to the protection relay, and the operator switches the eighth switch. When (SW8) is off, the R-phase current is instantaneously applied to the protection relay because it is enabled only for a predetermined time in accordance with the instantaneous control signal output from the control unit 32.

Next, a process of inspecting the protective relay 2 using the interface device acting as described above will be described.

The inspection device 1, the interface device 20, and the protective relay 2, which is the test object, are connected by cables as shown in FIG.

In this state, the sixth switch SW6 and the seventh switch SW7 of the parameter setting unit 31 are operated to select the R phase test (RR 'PHASE) item, and the eighth switch SW8 is turned on / off. Off, the instantaneous test and the time limit test are performed alternately. Then, by the control of the control unit 32, the test signal output terminals AC1 and AC2 of the inspection apparatus 1 and the R-R 'terminal of the protective relay 2 are connected, and the time limit test and the instantaneous test for the R phase are performed. Is executed.

Subsequently, when the S phase instantaneous test item and the S phase time limit test item are selected, the SSR output unit 26 operates under the control of the control unit 32 to control the AC1 and AC2 terminals of the inspection device 1 and the protective relay ( Connect S-S 'terminal of 2) and perform S phase time limit test and instantaneous test.

Next, select T-phase test and N-phase test items, and perform instantaneous test and time limit test for each as before.

Therefore, by connecting all the connection terminals of the protective relay 2 with the interface device 20 only once, inspection of all items of the protective relay 2 becomes possible.

As described above, the present invention reduces the number of connections and releases, thereby reducing maintenance time per protective relay, and also preventing incorrect wiring and short circuits between short circuits caused by frequent wiring. It is possible to obtain an excellent effect to improve the inspection performance by preventing the prevention and delay of maintenance time.

Claims (5)

In the interface device connecting the protective relay and the inspection device, A parameter setting unit including a plurality of selection switches for selecting an inspection item and outputting a unique signal according to on / off of the selection switch; A controller for recognizing a test item according to a selection signal applied from the parameter setting unit and outputting a relay selection signal according to the recognized test item; An output selection unit for outputting the relay selection signal output from the control unit in an instantaneous or timed manner according to the instantaneous or timed selection after the current amplification; One end is commonly connected to the test signal output terminals AC1 and AC2 of the inspection apparatus, and the other end is connected to the output terminals connected to the R, S, T, and N phase power terminals of the protection relay and the selection signal applied through the output selection unit. A solid state relay having a plurality of solid state relays (SSR) for turning on and off the output terminal, and connecting the selection terminal of the protection relay to the test signal output terminal of the inspection apparatus in accordance with the selection signal applied from the output selection unit ( Solid State Relay) output unit; A plurality of relays, one end of which is commonly connected to the test signal input terminals A and COM of the test apparatus, and the other end of which is connected to the temporary control terminal of the protection relay and turned on / off according to the selection signal of the controller input through the output selection unit. A relay output unit configured to connect a signal input terminal of the inspection apparatus and a selection terminal of the protection relay under control of the controller; A power relay having a plurality of power relays having contacts connected at both ends of the test device and the power supply terminal of the protection relay, and powering the power relay on and off according to a selection signal of the control unit to apply power of the test device to the protection relay; (Power Relay) output unit; A power supply unit converting the commercial AC power to provide the operation power to the above-described means; Interface device of the inspection device for protective relay, characterized in that consisting of. The device of claim 1, wherein the device is And an output selection display unit which receives the relay selection signal of the current amplified control unit from the output selection unit and displays the selected inspection item. The device of claim 1, wherein the device is Receiving data from the control unit, the interface device of the inspection device for a protective relay, characterized in that it further comprises an LCD for displaying the inspection and operation status. The method of claim 1, wherein the parameter setting unit The first switch SW1 for driving instruction, the second switch SW2 for time reduction, the third switch SW3 for time increase, the fourth switch SW4 for volume off, and the fifth switch for volume on ( SW5), a sixth switch SW6 for down-selecting a menu item, a seventh switch SW7 for up-selecting a menu item, and an eighth switch SW8 for instantaneous or timed-time selection. Interface device for the inspection device for protective relay. The method of claim 1, wherein the output selector A plurality of buffers respectively amplifying the selection signals output from the controller; A plurality of AND gates are enabled according to a predetermined voltage or an instantaneous control signal from the control unit through the on-state eighth switch to apply output signals of the plurality of buffers to the SSR output unit, the relay output unit, and the power relay output unit. Interface device of the inspection device for a protective relay, characterized in that consisting of.