CN204989341U - Machine becomes protective apparatus's logical testing arrangement of portable stand alone type shutting - Google Patents
Machine becomes protective apparatus's logical testing arrangement of portable stand alone type shutting Download PDFInfo
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- CN204989341U CN204989341U CN201520623191.7U CN201520623191U CN204989341U CN 204989341 U CN204989341 U CN 204989341U CN 201520623191 U CN201520623191 U CN 201520623191U CN 204989341 U CN204989341 U CN 204989341U
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Abstract
The utility model provides a machine becomes protective apparatus's logical testing arrangement of portable stand alone type shutting, the device lets second single -chip microcomputer couple together communication with first singlechip through setting up communication module, utilize this kind of circuit structure operating personnel can let second single -chip microcomputer export corresponding simulated condition signal according to the shutting logical map through the input device that operation and first singlechip are connected, corresponding action is made to the simulated condition signal of relay IO module receipt second single -chip microcomputer output, and thereby the next protective apparatus who is tested that drives makes corresponding shutting response, loaded down with trivial details artifical wiring has been replaced, operating is simplified has improved efficiency, the accessible with this testing arrangement with be connected with the mobile terminal of network, thereby renewal shutting logical map is connected to the computer schedule device, design through portable stand alone type has reduced operation expense, and improving user experience.
Description
Technical field
The utility model relates to electronic test equipment field, more specifically, relates to the Portable, self-contained latching logic proving installation that a kind of machine becomes proterctive equipment.
Background technology
The generator motor of hydroenergy storage station and transformer relay protecting equipment are for the protection of the safety of generator motor and transformer, and these proterctive equipment comprise about 40 kinds of different defencive functions.Because pump-storage generator possesses multiple operating condition and special main wiring mode; need under different operating conditions to take different locking (or open) logics to each defencive function; and having made the latching logic table of protection accordingly, table 1 is the latching logic table of one of them defencive function " power frequency differential protection ".As power frequency differential protection, need in " pull-over gear operation ", " being run by dragging ", " electric braking ", " SFC startup " four kinds of operating mode lockings, other five kinds of operating modes are open.
Table 1
When proterctive equipment carries out testing or checking, must test the latching logic of each protection preset.Pump-storage generator about has 9 kinds of operating modes on the whole; the decision condition of often kind of operating mode rely on again the position signalling of disconnecting link and the working condition signals of supervisory system etc. such as isolating switch, commutation cutter, electric braking cutter totally 23 way switch amount signal combination form (see table 2); proterctive equipment will gather this 23 road signal; then determine operating mode, then carry out the locking protected or opening according to the latching logic of this operating mode.Test latching logic will simulate various operating mode in fact exactly, namely by the opening or closing of every road signal of 23 road signals of operating mode decision condition control inputs relay protection device, opens as high level " 1 ", closes as low level " 0 ".More then check protection function is by correct locking or opening.Such as to carry out the test of power frequency differential protection " generator operation " operating mode, then need simulation generator operation operating mode, namely according to judging that the decision condition (see table 3) of generator operation operating mode inputs corresponding signal.
Table 2
| Machine end breaker closing position | By dragging switch A phase closing position |
| Machine end breaker open operation position | By dragging switch B phase closing position |
| Phase-change switch generating A phase closing position | By dragging switch C phase closing position |
| Phase-change switch generating A phase open position | Drag switch A phase closing position |
| Phase-change switch public B phase closing position | Drag switch B phase closing position |
| Phase-change switch public B phase open position | Drag switch C phase closing position |
| Phase-change switch generating C phase closing position | Turbine condenser mode pattern (monitoring) |
| Phase-change switch generating C phase open position | Water pump phase modulation pattern (monitoring) |
| Phase-change switch water pump A phase closing position | Electric braking switch closing position |
| Phase-change switch water pump A phase open position | Electric braking switch open position |
| Phase-change switch water pump C phase closing position | SFC enabling signal |
| Phase-change switch water pump C phase open position |
Table 3
| Machine end breaker closing position | 1 | By dragging switch A phase closing position | 0 |
| Machine end breaker open operation position | 0 | By dragging switch B phase closing position | 0 |
| Phase-change switch generating A phase closing position | 1 | By dragging switch C phase closing position | 0 |
| Phase-change switch generating A phase open position | 0 | Drag switch A phase closing position | 0 |
| Phase-change switch public B phase closing position | 1 | Drag switch B phase closing position | 0 |
| Phase-change switch public B phase open position | 0 | Drag switch C phase closing position | 0 |
| Phase-change switch generating C phase closing position | 1 | Turbine condenser mode pattern | 0 |
| Phase-change switch generating C phase open position | 0 | Water pump phase modulation pattern | 0 |
| Phase-change switch water pump A phase closing position | 0 | Electric braking switch closing position | 0 |
| Phase-change switch water pump A phase open position | 1 | Electric braking switch open position | 1 |
| Phase-change switch water pump C phase closing position | 0 | SFC enabling signal | 0 |
| Phase-change switch water pump C phase open position | 1 |
In the past when completing this test, the method taked was with the multichannel P cock plate of Non-follow control carrying out simulated condition decision signal, manual deciliter each road P cock and exportable required different working condition signal.Which kind of operating mode what need tester first to confirm to test during test is, then according to the operating mode that will test, according to operating mode decision condition artificial judgment each road P cock deciliter state and perform.The test often completing a kind of operating mode all needs to repeat this step, and P cock way is many, complicated operation, complex steps, and is easy to make mistakes.Suppose that often kind of operating mode on average needs 10 P cock operations, the test completing all protections needs operation 10*40*9=3600 time under the prerequisite of not makeing mistakes.And the output of each road signal does not have state to indicate, the signal outputing anticipation cannot be determined whether, be difficult to after makeing mistakes search.In addition, realize one_to_one corresponding between the device of test and tested object, namely the device realizing testing only is arranged for a certain tested object usually, the device realizing test is in permanent connection status with tested object on circuit, and due to the device volume realizing test comparatively large, it is usually located at the region close with tested object and is in stationary state on geographic position.First above phenomenon result in needs to set up multiple proving installation for different tested objects in practical operation, secondly due to the stationarity of proving installation on geographic position, even if tested object is the same on test philosophy, but because tested object is in different positions usually, cause needing to arrange multiple proving installation realizing same test logic, and then make the cost of investment of proving installation very high.
Utility model content
The utility model provides a kind of machine to become the Portable, self-contained latching logic proving installation of proterctive equipment, and this device can realize alternative manual operation and whether checking output simulated condition signal is anticipation signal, and can complete display and the control of parameter independently.
In order to reach above-mentioned technique effect, the technical solution of the utility model is as follows:
A kind of machine becomes the Portable, self-contained latching logic proving installation of proterctive equipment, comprise the first single-chip microcomputer, connect the communication module of the first single-chip microcomputer, second singlechip, relay I/O module, lead-out terminal row module, clock module, reseting module, download interface module and power module, described communication module, second singlechip, relay I/O module and lead-out terminal row module be connected in turn; Clock module is connected with download interface module, second singlechip respectively, reseting module is connected with second singlechip, download interface module is connected with second singlechip, power module respectively with the first single-chip microcomputer, communication module, second singlechip, relay I/O module, clock module, reseting module and download interface model calling; Described relay I/O module comprises some relays, and each I/O mouth of second singlechip connects the input end of a relay by a light emitting diode, and the output terminal of each relay is connected to the input end of a lead-out terminal row module; The output terminal of lead-out terminal row module is used for being connected with tested proterctive equipment; First single-chip microcomputer is connected with for showing the duty of this proving installation, the display screen of service data and managing for carrying out the service data of this proving installation the input equipment controlling setting; The data that communication module transmits by the first single-chip microcomputer are transferred to display screen display after carrying out filtering parsing, carried out encoding and then being transferred to second singlechip by communication module by the signal of input equipment simultaneously; Whether the operating state of each relay of described relay I/O module feeds back to the first single-chip microcomputer by second singlechip and communication module, correct for the first single-chip microcomputer automatic decision operation.
In the utility model, with the first single-chip microcomputer, communication module, second singlechip, relay I/O module is that core is to build whole circuit, second singlechip can be coupled together with the first single-chip microcomputer communicate by arranging communication module, utilize this circuit structure operating personnel second singlechip can be allowed to export corresponding simulated condition signal according to latching logic table by operating the input equipment in connecting to the first single-chip microcomputer, the simulated condition signal that relay I/O module reception second singlechip exports is made corresponding actions and is come thus drive tested proterctive equipment to make corresponding locking response, can also by the running status of device, the data such as control situation are presented on the display screen that is connected with the first single-chip microcomputer.The visible device of circuit structure of the present utility model that utilizes can substitute loaded down with trivial details artificial judgment and operation, simplifies operation and improves efficiency, and reduce operation expense by Portable, self-contained structure.In addition; again because the input end at each relay adds light emitting diode; and then can verify whether single-chip microcomputer correctly outputs the corresponding signal in protection blocking logical table by observing the light on and off situation of light emitting diode, reach checking single-chip microcomputer and export the object whether simulated condition signal is expected value.
Preferably, described display screen is LCD screen or LED screen, and described input equipment is button or keyboard.
Preferably, described first single-chip microcomputer is TX-1C51 single-chip microcomputer.
Preferably, described relay is the MULTICOMP-MC25113 type electromagnetic relay of 12V with one pair of single-pole double-throw switch (SPDT) contact.
Preferably, described download interface module is CH340USB interface circuit.
Preferably, described second singlechip is AT89S52 single-chip microcomputer.
Preferably, described power module is LM2576 switch voltage-stabilizing integrated circuit.
Preferably, described reseting module comprises electric capacity C9, resistance R2 and reset switch; One end of electric capacity C9 is connected with power module, and the other end of electric capacity C9 is connected with one end of resistance R2, the other end ground connection of resistance R2, and reset switch is connected in parallel on electric capacity C9 two ends.
Preferably, described clock module is crystal oscillating circuit.
In the utility model, the operating state of relay comprises the open and-shut mode of relay, the service data of proving installation comprises the instruction inputted by input equipment by operating personnel, instruction comprises directly the control operational order of single relay switch and the present day analog operating mode instruction of direct modeling operating mode, when input equipment is button, control relay closes when button is pressed first and remains on the low level pressed and then present combined floodgate, some situations or make operating mode present open state, button is pressed again and pilot relay disconnection when returning to a high position of upspringing makes to present separating brake, the situation of nothing or make operating mode present blocking.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
The utility model second singlechip can be coupled together with the first single-chip microcomputer communicate by arranging communication module, utilize this circuit structure operating personnel second singlechip can be allowed to export corresponding simulated condition signal according to latching logic table to the input equipment that the first single-chip microcomputer connects by operation, the simulated condition signal that relay I/O module reception second singlechip exports is made corresponding actions and is come thus drive tested proterctive equipment to make corresponding locking response, instead of loaded down with trivial details artificial wiring, simplify operation and improve efficiency, by by this proving installation and the mobile terminal being connected with network, the devices such as computing machine connect thus upgrade latching logic table, operation expense is reduced by Portable, self-contained design, improve Consumer's Experience.Simultaneously; because the input end at each relay adds light emitting diode; and then can verify whether second singlechip correctly outputs the corresponding signal in protection blocking logical table by observing the light on and off situation of light emitting diode, reach checking second singlechip and export the object whether simulated condition signal is expected value.Whether actuating of relay state also feeds back to the first single-chip microcomputer by second singlechip and communication module simultaneously, correct for the first single-chip microcomputer automatic decision operation.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present utility model;
Fig. 2 is the utility model single-chip microcomputer pin wiring diagram;
Fig. 3 is single-chip microcomputer and relay I/O model calling schematic diagram in the utility model;
Fig. 4 is the utility model communication module circuit structure diagram;
Fig. 5 is the circuit diagram of the utility model crystal oscillator;
Fig. 6 is the utility model power module circuitry figure;
Fig. 7 is the utility model download interface module circuit diagram;
Fig. 8 is the utility model reseting module circuit diagram.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of machine becomes the Portable, self-contained latching logic proving installation of proterctive equipment, comprise the first single-chip microcomputer, connect the communication module of the first single-chip microcomputer, second singlechip, relay I/O module, lead-out terminal row module, clock module, reseting module, download interface module and power module, described communication module, second singlechip, relay I/O module and lead-out terminal row module be connected in turn; Clock module is connected with download interface module, second singlechip respectively, reseting module is connected with second singlechip, download interface module is connected with second singlechip, power module respectively with the first single-chip microcomputer, communication module, second singlechip, relay I/O module, clock module, reseting module and download interface model calling; Described relay I/O module comprises some relays, and each I/O mouth of second singlechip connects the input end of a relay by a light emitting diode, and the output terminal of each relay is connected to the input end of a lead-out terminal row module; The output terminal of lead-out terminal row module is used for being connected with tested proterctive equipment; First single-chip microcomputer is connected with for showing the duty of this proving installation, the display screen of service data and managing for carrying out the service data of this proving installation the input equipment controlling setting; The data that communication module transmits by the first single-chip microcomputer are transferred to display screen display after carrying out filtering parsing, carried out encoding and then being transferred to second singlechip by communication module by the signal of input equipment simultaneously; Whether the operating state of each relay of described relay I/O module feeds back to the first single-chip microcomputer by second singlechip and communication module, correct for the first single-chip microcomputer automatic decision operation.
In the present embodiment, display screen is LCD screen or LED screen, and described input equipment is button or keyboard; First single-chip microcomputer is TX-1C51 single-chip microcomputer; Relay is the MULTICOMP-MC25113 type electromagnetic relay of 12V with one pair of single-pole double-throw switch (SPDT) contact.In order to isolate input/output signal, be also connected with the photoelectric isolating coupler for preventing signal disturbing between each light emitting diode and the relay be attached thereto, this photoelectric isolating coupler is EL817 type photoelectric isolating coupler.
In a particular application, the Portable, self-contained latching logic proving installation of machine change proterctive equipment of the present utility model can adopt circuit realiration as shown in Figures 2 and 3.As shown in Figures 2 and 3, single-chip microcomputer in the present embodiment adopts AT89S52 single-chip microcomputer, relay I/O module comprise 16 relays (only draw in Fig. 38 in 16 relays with the connection of single-chip microcomputer, other 8 consistent with the connection in Fig. 3 is connected with other 8 the I/O mouth P0.0-P0.7 of single-chip microcomputer), the I/O mouth P2.0-P2.7 of AT89S52 single-chip microcomputer connects relay J 1-J7 through photoelectrical coupler U1-U8 (in figure, the input end Q1-Q8 of U1-U8 is all connected to power module) again respectively by LED P 20-P27, relay J 1-J7 is connected to the lead-out terminal out0-out7 of lead-out terminal row module respectively, lead-out terminal out0-out7 is for connecting the corresponding discrepancy end of tested proterctive equipment.
Service data comprises the instruction inputted by input equipment by operating personnel, and instruction comprises and directly controls the operational order of single electromagnetic relay deciliter and the present day analog operating mode instruction of direct modeling operating mode.Input equipment can be button and keyboard etc.When input equipment is button, control relay closes when button is pressed first and remains on the low level pressed and then present combined floodgate, there is something special or make operating mode present open state, button is pressed again and pilot relay disconnection when returning to a high position of upspringing makes present separating brake, nil case or make operating mode present blocking, in addition, when button is in low level, the LED light work of button interior sends red light, makes staff can get information about the service data situation of setting.Because the technical scheme that the utility model is concrete have employed 16 relays and 9 kinds of operating modes, therefore need employing 25 buttons.The action situation of each button and the corresponding relation of the ruuning situation obtained are as following table 4,5.
Table 4
Table 5
As shown in Figures 2 and 4, communication module comprises the RS-232 serial interface COM1 and MAX232 interface chip that connect in turn; 10,11 pins of RS-232 serial interface COM1 are used for connecting one-chip computer module, 2,3 pins of RS-232 serial interface COM1 are connected with T1OUT and the R1IN pin of MAX232 interface chip, R1OUT and the T1IN pin of MAX232 interface chip is connected to RXD pin and the TXD pin of AT89S52 single-chip microcomputer.
As shown in figures 2 and 5, clock module adopts crystal oscillating circuit, crystal oscillating circuit in the present embodiment comprises crystal oscillator Y1, electric capacity CX1, CX2, electric capacity CX1 and CX2 is connected in series, crystal oscillator Y1 be connected in parallel on electric capacity CX1 and CX2 be connected in series after the two ends of circuit, draw two output terminal XTAL1 and XTAL2 from the two ends of crystal oscillator, the tie point ground connection between electric capacity CX1 and CX2, XTAL1.0 with XTAL2.0 is connected with clock input pin XTAL1 and XTAL2 of AT89S52 single-chip microcomputer respectively.
Power module adopts LM2576 switch voltage-stabilizing integrated circuit, embody rule circuit can be as seen in figs, it comprises single-pole double-throw switch (SPDT) KEY1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, LM2576 chip, voltage stabilizing diode D0, inductance L 1, light emitting diode D1, resistance R1, single-pole double-throw switch (SPDT) KEY1 is for connecting direct supply, 2 of single-pole double-throw switch (SPDT) KEY1, 5 contacts are connected in parallel on electric capacity C1 two ends, the 5 contact ground connection of single-pole double-throw switch (SPDT) KEY1, electric capacity C2 is connected in parallel on electric capacity C1 two ends, one end that electric capacity C1 with C2 is connected with 2 contacts of double-pole double throw switch KEY1 inputs (IN) pin and is connected with LM2576 chip, one end that electric capacity C1 with C2 is connected with 5 contacts of double-pole double throw switch KEY1 is connected with ON/OFF and the GND pin of LM2576 chip, the FB pin of LM2576 chip is connected with one end of electric capacity C3, the other end ground connection of electric capacity C3, the output OUT pin of LM2576 chip is connected with the anode of voltage stabilizing diode D0 and one end of inductance L 1, the plus earth of voltage stabilizing diode D0, the other end of inductance L 1 exports the ungrounded end that+5V voltage is connected to electric capacity C3, electric capacity C4, resistance R1, light emitting diode D1 connects into a series loop, the negative electrode of light emitting diode D1 goes back ground connection simultaneously, electric capacity C3 is also connected in parallel on electric capacity C4 two ends simultaneously.Close at KEY1, export+5V voltage from the OUT pin of LM2576 chip and drive light emitting diode D1 luminescence normally to work to point out power module 8.
Download interface module adopts CH340USB interface circuit, embody rule circuit can be as shown in figs. 2 and 7, it comprises USB interface and CH340 chip, input pin D-, D+ of USB interface are connected to input pin UD-, UD+ of CH340 chip, TXD, RXD pin of CH340 chip and TXD, RXD pin of AT89S52 single-chip microcomputer.
As shown in Figures 2 and 8, reseting module comprises electric capacity C9, resistance R2 and reset switch; One end of electric capacity C9 is connected with power module, and the other end of electric capacity C9 is connected with the reset pin 9 of one end of resistance R2 and AT89S52 single-chip microcomputer, the other end ground connection of resistance R2, and reset switch is connected in parallel on electric capacity C9 two ends.
In the utility model, with the first single-chip microcomputer, communication module, second singlechip, relay I/O module is that core is to build whole circuit, second singlechip can be coupled together with the first single-chip microcomputer communicate by arranging communication module, utilize this circuit structure operating personnel second singlechip can be allowed to export corresponding simulated condition signal according to latching logic table by operating the input equipment in connecting to the first single-chip microcomputer, the simulated condition signal that relay I/O module reception second singlechip exports is made corresponding actions and is come thus drive tested proterctive equipment to make corresponding locking response, can also by the running status of device, the data such as control situation are presented on the display screen that is connected with the first single-chip microcomputer.The visible device of circuit structure of the present utility model that utilizes can substitute loaded down with trivial details artificial judgment and operation, simplifies operation and improves efficiency, and reduce operation expense by Portable, self-contained structure.In addition; again because the input end at each relay adds light emitting diode; and then can verify whether single-chip microcomputer correctly outputs the corresponding signal in protection blocking logical table by observing the light on and off situation of light emitting diode, reach checking single-chip microcomputer and export the object whether simulated condition signal is expected value.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection domain that all should be included in the utility model claim.
Claims (9)
1. the Portable, self-contained latching logic proving installation of a machine change proterctive equipment, it is characterized in that, comprise the first single-chip microcomputer, connect the communication module of the first single-chip microcomputer, second singlechip, relay I/O module, lead-out terminal row module, clock module, reseting module, download interface module and power module, described communication module, second singlechip, relay I/O module and lead-out terminal row module be connected in turn; Clock module is connected with download interface module, second singlechip respectively, reseting module is connected with second singlechip, download interface module is connected with second singlechip, power module respectively with the first single-chip microcomputer, communication module, second singlechip, relay I/O module, clock module, reseting module and download interface model calling; Described relay I/O module comprises some relays, and each I/O mouth of second singlechip connects the input end of a relay by a light emitting diode, and the output terminal of each relay is connected to the input end of a lead-out terminal row module; The output terminal of lead-out terminal row module is used for being connected with tested proterctive equipment; First single-chip microcomputer is connected with for showing the duty of this proving installation, the display screen of service data and managing for carrying out the service data of this proving installation the input equipment controlling setting; The data that communication module transmits by the first single-chip microcomputer are transferred to display screen display after carrying out filtering parsing, carried out encoding and then being transferred to second singlechip by communication module by the signal of input equipment simultaneously; Whether the operating state of each relay of described relay I/O module feeds back to the first single-chip microcomputer by second singlechip and communication module, correct for the first single-chip microcomputer automatic decision operation.
2. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described display screen is LCD screen or LED screen, and described input equipment is button or keyboard.
3. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described first single-chip microcomputer is TX-1C51 single-chip microcomputer.
4. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described relay is the MULTICOMP-MC25113 type electromagnetic relay of 12V with one pair of single-pole double-throw switch (SPDT) contact.
5. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described download interface module is CH340USB interface circuit.
6. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described second singlechip is AT89S52 single-chip microcomputer.
7. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described power module is LM2576 switch voltage-stabilizing integrated circuit.
8. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described reseting module comprises electric capacity C9, resistance R2 and reset switch; One end of electric capacity C9 is connected with power module, and the other end of electric capacity C9 is connected with one end of resistance R2, the other end ground connection of resistance R2, and reset switch is connected in parallel on electric capacity C9 two ends.
9. machine according to claim 1 becomes the Portable, self-contained latching logic proving installation of proterctive equipment, and it is characterized in that, described clock module is crystal oscillating circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061368A (en) * | 2018-08-31 | 2018-12-21 | 深圳蓄能发电有限公司 | A kind of tool for verifying generating set protective device operating condition latching logic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061368A (en) * | 2018-08-31 | 2018-12-21 | 深圳蓄能发电有限公司 | A kind of tool for verifying generating set protective device operating condition latching logic |
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