CN102891532A - Portable microcomputer charging protection device and method - Google Patents
Portable microcomputer charging protection device and method Download PDFInfo
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- CN102891532A CN102891532A CN2012102944704A CN201210294470A CN102891532A CN 102891532 A CN102891532 A CN 102891532A CN 2012102944704 A CN2012102944704 A CN 2012102944704A CN 201210294470 A CN201210294470 A CN 201210294470A CN 102891532 A CN102891532 A CN 102891532A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a portable microcomputer charging protection device and a portable microcomputer charging protection method, and belongs to the field of electrical engineering and the automation of the electrical engineering. The device comprises a protective chassis, a direct-current power supply wiring terminal, a three-phase current input wiring terminal, a tripping switch piece, a direct-current switch, a comprehensive digital relay, a tripping output wiring terminal and an installation panel. The invention has the advantages that the device is small in size, light in weight, easy to carry and low in power; remote communication can be realized; the protective fault removing time of the device is short; the operating current and the operating time are wide in setting range and are easy to set; and the operating mode can be set by four groups of tripping switch pieces and also can be set by the comprehensive digital relay.
Description
Technical field
The invention belongs to the Electrical Engineering and Its Automation field, be specifically related to a kind of portable microcomputer charge protection device and method.
Background technology
When the transmission line that newly puts into operation and new equipment are charged test, drop into a kind of device that is charge protection.When new used device because of insulation breakdown or transmission line electrical safety apart from not enough when being short-circuited fault, charge protection device will move, excise fast faulty line or equipment, charge after the off-test, charge protection device is out of service.This device can avoid hindering for some reason circuit or equipment can not in time excise, and the related transmission line power failure that the electric power system that causes has moved, related power plant and electric power system off-the-line can not safe and stable operations.At present, electric power system reconstruction and enlarging, newly-built power plant and substation project, the charge protection device that adopts generally are comprised of 16 devices such as electromagnetic type current relay, the time relay, signal relay and auxiliary relay.When the transmission line of new input or equipment were short-circuited, the electric power system electric current raise and surpasses charge protection device setting current value, charge protection device action, excision faulty line or equipment.
But there is following defective in this technical elements at present:
(1) the syllogic current protective device that formed by 16 electromagnetic type current relays, the time relay, signal relay and auxiliary relays of charge protection device, volume is large, is not easy to test with carrying;
(2) to electric pressure 220kV and the test of above transmission line initial charge, be no more than 10mms claimed operate time, and the charge protection device intrinsic operate time that is comprised of 16 electromagnetic type relays is near 100mms, so that the protection excision is long fault time, cause power system oscillation, its safe and stable operation is had a strong impact on;
(3) electric pressure 500kV transmission line initial charge test, requiring the minimum setting current of charge protection is 0.3A, and the minimum setting current of charge protection device employing DL type electromagnetic type current relay is 0.5A, when new input transmission line or equipment are short-circuited, the tripping of charge protection possibility, fault can not be excised;
(4) adjusting of charge protection operating current, operate time: the technical staff at first opens electromagnetic type current relay and time relay seal cover, then stir the relay setting handle and carry out the definite value setting, so the inconvenience of adjusting, setting value is inaccurate, error is large;
(5) when Power System Shortcuts electric current and charge protection operating current near the time, the contact chatter of electromagnetic type current relay, produce electric arc, easy burn-out current relay;
(6) power plant and transformer station's electromagnetic interference are larger, so that the easy misoperation of charge protection device that is comprised of electromagnetic type relay;
(7) charge protection device and power plant and Supervisory Control System for Substation can't realize that a distant place " four is distant " communicates by letter, and the charge protection action message can't be understood by distant place control centre;
(8) electromagnetic type relay adopts the electromagnetism operation principle, so the coil power loss of relay is large, coil easily generates heat and relay is burnt out.
Summary of the invention
For the deficiencies in the prior art; purpose of the present invention proposes a kind of portable microcomputer charge protection device and method, with realize being easy to carry, the device action time is short, fixed value adjusting convenient, information can show, failure wave-recording can be uploaded, control and management, event is recollected and the purpose of communication.
A kind of portable microcomputer charge protection device, this device comprise protection cabinet, DC power supply binding post, three-phase current lead-in clamp, tripping operation transfer strip, dc switch, comprehensive digital relay, tripping operation output wiring terminal and installation panel; Wherein said installation panel left side is provided with DC power supply binding post and three-phase current lead-in clamp; The right side is provided with the tripping operation output wiring terminal; The centre is provided with comprehensive digital relay, and described comprehensive digital relay below is provided with dc switch; Described dc switch both sides are provided with the tripping operation transfer strip;
Circle metal angle by the setting of protection cabinet inwall is realized described installation panel and is protected being connected of cabinet; Described DC power supply binding post connects the input of comprehensive digital relay by dc switch; Described tripping operation output wiring terminal connects the output of comprehensive digital relay by the tripping operation transfer strip; Described three-phase current lead-in clamp connects the input of comprehensive digital relay.
Described protection cabinet comprises case lid, casing, case lock and handle, is provided with the tapered end corresponding with locked groove on the casing on the described case lid, opens tapered end, and case lid can separate with casing.
Described protection cabinet adopts electrostatic spraying to process.
Described protection cabinet material adopts the metallic plate that can show electrostatic screen.
Described installation panel adopts electrostatic spraying to process.
Be provided with shockproof hemisphere sponge in the described case lid.
Adopt the portable microcomputer charge protection device in charging process, to carry out the method for current protection, may further comprise the steps:
If step 3 input current is greater than the operating current of this protective device, and current duration reaches the operate time of protection, and then execution in step 4; Otherwise return execution in step 2;
Described operating current scope is 0.2～20 times of rated current, and described operate time, scope was 0s～100s.
Advantage of the present invention:
(1) charge protection device of the present invention comprises a comprehensive digital relay, and volume is little, lightweight, is convenient to test with carrying;
(2) charge protection device of the present invention so that the protection excision is short fault time, should not cause power system oscillation near 8mms intrinsic operate time, is conducive to the power system safety and stability operation;
(3) the minimum setting current of charge protection device of the present invention is 0.2A, and satisfying electric pressure 500kV transmission line initial charge, to test minimum setting current be the 0.3A specification requirement;
(4) charge protection device operating current of the present invention, operate time are when setting, the operator only need operate the instruction of comprehensive digital relay panel " button " choice menus, the input set point shows definite value by LCD, so fixed value adjusting is convenient, accurate, numeral shows;
(5) charge protection device operating current of the present invention, operate time, setting range was large, and set point is continuous numerical value;
(6) charge protection device of the present invention is communicated by letter with power plant and a Supervisory Control System for Substation realization distant place " four is distant ", and the charge protection action message can in time be understood by distant place control centre;
(7) operational mode of charge protection device of the present invention not only can be set by four groups of tripping operation transfer strips, sets but also can pass through comprehensive digital relay write-protect (soft pressing plate), so flexible, reliable;
(8) charge protection device of the present invention adopts digital relay, so the power loss of relay is little, does not generate heat.
Description of drawings
Fig. 1 is the apparatus structure schematic diagram of an embodiment of the present invention, wherein, (a) is protection casing structure schematic diagram, (b) is apparatus structure schematic diagram in the protection cabinet;
Fig. 2 is the device installation panel marked graph of an embodiment of the present invention;
Fig. 3 is the circuit theory diagrams of an embodiment of the present invention;
Fig. 4 is an embodiment of the present invention current protection method flow chart.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described further.
Shown in (a) and (b) among Fig. 1, a kind of portable microcomputer charge protection device, this device comprise protection cabinet 1, DC power supply binding post 2, three-phase current lead-in clamp 3, tripping operation transfer strip 4, dc switch 5, comprehensive digital relay 6, tripping operation output wiring terminal 7 and installation panel 8; In the embodiment of the invention, installation panel 8 left sides arrange described two DC power supply binding posts 2 and six three-phase current lead-in clamps 3; The right side arranges described eight tripping operation output wiring terminals 7; The centre arranges described comprehensive digital relay 6, and the comprehensive digital relay below arranges dc switch 5; Described dc switch 5 both sides arrange respectively two tripping operation transfer strips 4.
Circle metal angle by the 1 inwall setting of protection cabinet is realized described installation panel 8 and is protected being connected of cabinet 1; Described DC power supply binding post 2 connects the input of comprehensive digital relay 6 by dc switch 5; Described tripping operation output wiring terminal 7 connects the output of comprehensive digital relay 6 by tripping operation transfer strip 4; Described three-phase current lead-in clamp 3 connects the input of comprehensive digital relay 6.Described installation panel 8 adopts electrostatic spraying to process.
Shown in (a) figure of Fig. 1, described protection cabinet 1 comprises case lid 1-1, casing 1-2, case lock 1-3 and handle 1-4, is provided with the tapered end corresponding with the upper locked groove of casing 1-2 on the described case lid 1-1, opens tapered end, and case lid 1-1 can separate with casing 1-2; Described protection cabinet 1 adopts electrostatic spraying to process, and above-mentioned protection cabinet 1 material adopts the metallic plate that can show electrostatic screen; Be provided with shockproof hemisphere sponge in the described case lid 1-1.In the embodiment of the invention, protection cabinet 1 overall dimension (mmm of unit) is: wide * high * dark=415 * 300 * 315.Wherein, casing 1-2(does not comprise case lid) height: 250mm (outside dimension); Case lid is high: 50mm (outside dimension), and liner hemisphere black sponge (ethylene-vinyl acetate copolymer is the novel environment friendly rubber-plastics material) is realized anti-skidding, antidetonation, heat insulation, moistureproof, anticorrosive; Uneasy hinged joint between case lid 1-1 and the casing 1-2 is installed four case is locked, and locks by opening four casees, realizes that case lid 1-1 separates with casing 1-2, and is provided with sealing gasket between case lid 1-1 and the casing 1-2, and the realization sealing and dustproof is rainproof; In casing 1-2 bottom four hemisphere stainless steel pad legs are installed, are realized shock resistance; Casing 1-2 installs a handle 1-4, and time spent handle 1-4 and casing 1-2 are not close to; Cabinet 1 each angle stainless steel cornerite is protected with the aluminium angle parcel of 20mm * 20mm, thick 1.0mm in protection cabinet 1 each limit; Inlay the aluminium angle of circle 15mm * 15mm, a thick 2.0mm from casing 1-2 is upper along casing 1-2 inwall along to lower 3.0mm, symmetrical hole of boring four M3.7 on the aluminium angle, and tapping are used for fixed installation panel 8; Casing 1-2 and case lid 1-1 material: the thick aluminium sheet of 2.0mm, realize electrostatic screen and carrying portable; Whole protection cabinet 1 electrostatic spraying is processed and is realized anticorrosive property.
Red 1 of DC power supply binding post 2(, 1 of black) external 110～220V DC power supply, as the working power of comprehensive digital relay 6.Dc switch 5 is as the working power switch of comprehensive digital relay 6.Yellow 2 of three-phase current lead-in clamp 3(, green 2 and red 2) draw the three-phase current of connection electric transmission line current transformer output, as the input current of comprehensive digital relay 6.Comprehensive digital relay 6(model is PA140-F1) formed by master control borad, man-machine interface plate, bus board, power panel, current transformer plate, relay board, shell and binding post; realize charging protection function, be used for monitoring transmission line and apparatus insulated performance integrity.Tripping operation transfer strip 4 is set " throwing " position as microcomputer charge protection device operational mode setting member when " tripping operation 1 " transfer strip, and comprehensive digital relay 6 " tripping operation 1 " exports and puts into operation; Set " moving back " position when " tripping operation 1 " transfer strip, comprehensive digital relay 6 " tripping operation 1 " outlet is out of service.Transfer strip roughly the same with " tripping operation 1 " for the purposes of other " tripping operation " transfer strip.8 of tripping operation output wiring terminal 7(black) is connected with the trip(ping) circuit of four groups of circuit breakers of system under test (SUT), when comprehensive digital relay 6 actions, the transfer strip 4 that trips is all set " throwing " position, and " portable microcomputer charge protection device " exports four groups of trip signals.
As shown in Figure 2, in the circular hole that installation panel sign " throwing, retreating " is located, inserting four tripping operation transfer strip 4(models is JY1-3), and fix with the standard component of himself being with, three conducting rods of every transfer strip should with installation panel 8 mutually insulateds; Locate in sign " DC+ ", insert a red binding post (model is JXZ-1/1), sign " DC-" locates to insert a black binding post (model is JXZ-1/1); Locate in sign " IA, Ia ", insert two yellow binding posts (model is JXZ-1/1); Locate in sign " IB, Ib ", insert two green binding posts (model is JXZ-1/1); Locate in sign " IC, Ic ", insert two red binding posts (model is JXZ-1/1); Locate in sign " tripping operation 1, tripping operation 2, tripping operation 3, tripping operation 4 ", insert eight black binding posts (model is JXZ-1/1); And with himself the band standard component fix, the conducting rod of all binding posts should with installation panel 8 mutually insulateds; Inserting comprehensive digital relay 6(model in 128.5 * 139.2 rectangular opening is PA140-F1), and fix (each support inserts attachment rail, and an end heads on installation panel 8, and the other end is fixed on the relay 6) with two supports of himself band.Inserting dc switch 5(model in 20 * 26.8 rectangular opening is KCD-102), by self fixing.
As shown in Figure 3, the yellow binding post that adopts yellow BVR-2.5mm2 wire will be designated IA in the embodiment of the invention is connected with the X4-1 binding post of comprehensive digital relay 6; The yellow binding post that adopts yellow BVR-2.5mm2 wire will be designated Ia is connected with the X4-2 binding post of comprehensive digital relay 6.The green binding post that adopts green BVR-2.5mm2 wire will be designated IB is connected with the X4-3 binding post of comprehensive digital relay 6; The green binding post that adopts green BVR-2.5mm2 wire will be designated Ib is connected with the X4-4 binding post of comprehensive digital relay 6.The red binding post that adopts red BVR-2.5mm2 wire will be designated IC is connected with the X4-5 binding post of comprehensive digital relay 6; The red binding post that adopts red BVR-2.5mm2 wire will be designated Ic is connected with the X4-6 binding post of comprehensive digital relay 6.The red binding post that adopts red BVR-1.5mm2 wire will be designated DC+ is connected with the binding post 1 of dc switch QF; Adopt red BVR-1.5mm2 wire that the X5-1 binding post of comprehensive digital relay 6 is connected with the binding post 2 of dc switch QF; The black binding post that adopts black BVR-1.5mm2 wire will be designated DC-is connected with the binding post 3 of dc switch QF; Adopt black BVR-1.5mm2 wire that the X5-2 binding post of comprehensive digital relay 6 is connected with the binding post 4 of dc switch QF.The black binding post that adopts black BVR-1.5mm2 wire will be designated " tripping operation 1 " is connected with the binding post 2 of " tripping operation 1 " transfer strip XB1; Adopt black BVR-1.5mm2 wire that the X5-4 binding post of comprehensive digital relay 6 is connected with the binding post 1 of " tripping operation 1 " transfer strip XB1; Adopt black BVR-1.5mm2 wire that the X5-5 binding post of comprehensive digital relay 6 is connected with another black binding post that is designated " tripping operation 1 ".The black binding post that adopts black BVR-1.5mm2 wire will be designated " tripping operation 2 " is connected with the binding post 2 of " tripping operation 2 " transfer strip XB2; Adopt black BVR-1.5mm2 wire that the X2-1 binding post of comprehensive digital relay 6 is connected with the binding post 1 of " tripping operation 2 " transfer strip XB2; Adopt black BVR-1.5mm2 wire that the X2-2 binding post of comprehensive digital relay 6 is connected with another black binding post that is designated " tripping operation 2 ".The black binding post that adopts black BVR-1.5mm2 wire will be designated " tripping operation 3 " is connected with the binding post 2 of " tripping operation 3 " transfer strip XB3; Adopt black BVR-1.5mm2 wire that the X2-5 binding post of comprehensive digital relay 6 is connected with the binding post 1 of " tripping operation 3 " transfer strip XB3; Adopt black BVR-1.5mm2 wire that the X2-6 binding post of comprehensive digital relay 6 is connected with another black binding post that is designated " tripping operation 3 ".The black binding post that adopts black BVR-1.5mm2 wire will be designated " tripping operation 4 " is connected with the binding post 2 of " tripping operation 4 " transfer strip XB4; Adopt black BVR-1.5mm2 wire that the X5-6 binding post of comprehensive digital relay 6 is connected with the binding post 1 of " tripping operation 4 " transfer strip XB4; Adopt black BVR-1.5mm2 wire that the X5-7 binding post of comprehensive digital relay 6 is connected with another black binding post that is designated " tripping operation 4 ".
Embodiment of the invention working power voltage is: direct current 110～220V.Input rated current: In=1A or 5A; Charge protection " tripping relay " contact: DC220V, 5～8A; Charge protection " actuating signal relay " contact: DC220V, 5A.
Adopt the current protection method of portable microcomputer charge protection device, as shown in Figure 4, may further comprise the steps:
Adopt the portable microcomputer charge protection device to carry out the method for current protection, may further comprise the steps:
If step 3 input current is greater than the operating current of this protective device, the scope of operating current described in the present embodiment is 0.3～0.5A, and current duration reaches the operate time of protection, and operate time described in the present embodiment, scope was 0ms～80ms, and then execution in step 4; If input current is less than the operating current of this protective device, and current duration do not reach the operate time of protection, then returns execution in step 2;
The embodiment of the invention can realize following functions:
(1) realizes two-part current protection (current quick-breaking and time limit current quick break protection) function.Voltage and current signal from the input of electrical network primary equipment instrument transformer; after the voltage current transducer collection of comprehensive digital relay 6, low-pass filtering; amplify and the limited amplitude protection device through variable connector, operational amplifier again; be transformed into the ac voltage signal of the amplitude that meets A/D conversion requirement, process by single-chip microcomputer through the digital quantity that the A/D conversion produces.When the operating current of input current greater than this protective device, and when current duration reaches the operate time of protection, protective device sends trip signal and the alarm signal driving interface circuit to the comprehensive digital relay 6, drive interface circuit above-mentioned signal is delivered to the exit relay plate, breaker tripping and closing relay contact output trip signal on the exit relay plate, trip signal is sent to the circuit breaker trip loop of circuit-under-test by the tripping operation output wiring terminal; Alarm signal relay contact outputting alarm signal on the exit relay plate, this alarm signal are sent to the alarm loop of circuit-under-test by the tripping operation output wiring terminal; Simultaneously, the CPU in the comprehensive digital relay sends the status signal of tripping operation output wiring terminal to circuit-under-test remote dispatching center, and shows the status signal information of tripping operation output wiring terminal in comprehensive digital relay 6 LCDs.
The two-part current protection adopts fourier algorithm.
One-period current function i (t) is decomposed into the infinite series of DC component, first-harmonic and each harmonic:
Wherein, ω
1Be the first-harmonic angular frequency;
T is the time;
N is harmonic number;
a
n, b
nThe amplitude that represents respectively nth harmonic sine term and cosine term.
Because
Wherein, T is the cycle; Then the effective value of nth harmonic current component is
The effective value of fundamental current component is
The criterion of two-part current protection is: I
1I
Dz, t
1T
DzWherein, I
1For being input to the fundamental current effective value of portable microcomputer charge protection device, I
DzBe the operating current value; t
1Be I
1Current duration, t
DzBe the operate time of portable microcomputer charge protection device.When satisfying this criterion, the action of portable microcomputer charge protection device.
(2) control function.The present embodiment device is by " combined floodgate " operating key or " separating brake " operating key on the operation comprehensive digital relay 6, CPU in the comprehensive digital relay 6 sends corresponding control command, arrive the driving interface circuit through its breaker tripping and closing signal and alarm signal, drive interface circuit these signals are delivered to the exit relay plate, breaker tripping and closing relay contact on the exit relay plate is connected the jump, closing loop of tested electrical network primary circuit circuit breaker by the tripping operation output wiring terminal, make that circuit breaker divides, closing operation, realize distant place control function.
(3) measurement function.After the voltage current transducer sampling of the voltage and current signal of input in comprehensive digital relay, the low-pass filtering, amplify through variable connector, operational amplifier again, be transformed into the ac voltage signal of the amplitude that meets A/D conversion requirement, produce digital quantity through the A/D conversion, through single-chip microcomputer computing, the processing of comprehensive digital relay, can measure the three-phase phase voltage of primary circuit, three-phase line voltage, electric current, power factor, frequency etc.
(4) distant place device management function.The present embodiment device can communicate with the remote dispatching center through the serial communication RS485/RS422 interface of the photoelectricity isolation of comprehensive digital relay 6, realizes the functions such as remote control, remote signalling, remote regulating, remote measurement, a protection distant place are thrown and moved back, failure wave-recording is uploaded.CPU in the comprehensive digital relay 6 can accept pulse signal, the remote control input signal amount of isolating through photoelectricity and the input signal amount that produces by operations such as keyboard inquiry, the definite values of adjusting.
(5) communication function.The present embodiment device adopts the RS485/RS422 communication interface to carry out communication with main control computer, thereby transmit in the distant place of the information of realization and exchange.By main control computer can realize to the protective device definite value distant place inquiry, setting function and to the distant place control function of device.
(6) event is recollected function.The present embodiment device can be by time of origin, type and the operating value of comprehensive digital relay 6 automatic recording events.The resolution of its logout is less than 2 milliseconds, and has power down and do not lose function.
(7) Presentation Function.The present embodiment detects all signal measurements obtain, protection operating value, breaker tripping and closing displacement record, tuning process, query script, fault type, remote signalling amount, mains frequency, time etc. and all can show at the LCD of the comprehensive digital relay 6 of this device.
(8) failure wave-recording upload function.Adopt the RS485/RS422 communication interface of the comprehensive digital relay 6 of the present embodiment device, realize the failure wave-recording upload function, the current-voltage waveform during the energy record trouble also is uploaded to the PC demonstration.This just is the surveillance operation, analyzes accident cause detailed data is provided.
(9) time clock feature.Adopt the RS485/RS422 communication interface of the comprehensive digital relay 6 of the present embodiment device, be connected with host computer can realize clock automatically to the time, Presentation Function.
Claims (8)
1. portable microcomputer charge protection device is characterized in that: this device comprises protection cabinet (1), DC power supply binding post (2), three-phase current lead-in clamp (3), tripping operation transfer strip (4), dc switch (5), comprehensive digital relay (6), tripping operation output wiring terminal (7) and installation panel (8); Wherein said installation panel (8) left side is provided with DC power supply binding post (2) and three-phase current lead-in clamp (3); The right side is provided with tripping operation output wiring terminal (7); The centre is provided with comprehensive digital relay (6), and described comprehensive digital relay below is provided with dc switch (5); Described dc switch (5) both sides are provided with tripping operation transfer strip (4);
Circle metal angle by the inwall setting of protection cabinet (1) is realized described installation panel (8) and is protected being connected of cabinet (1); Described DC power supply binding post (2) connects the input of comprehensive digital relay (6) by dc switch (5); Described tripping operation output wiring terminal (7) connects the output of comprehensive digital relay (6) by tripping operation transfer strip (4); Described three-phase current lead-in clamp (3) connects the input of comprehensive digital relay (6).
2. portable microcomputer charge protection device according to claim 1; it is characterized in that: described protection cabinet (1); comprise case lid (1-1), casing (1-2), case lock (1-3) and handle (1-4); be provided with the tapered end corresponding with the upper locked groove of casing (1-2) on the described case lid (1-1); open tapered end, case lid (1-1) can separate with casing (1-2).
3. portable microcomputer charge protection device according to claim 1 is characterized in that: described protection cabinet (1) employing electrostatic spraying processing.
4. portable microcomputer charge protection device according to claim 1 is characterized in that: described protection cabinet (1) material adopts the metallic plate that can show electrostatic screen.
5. portable microcomputer charge protection device according to claim 1 is characterized in that: described installation panel (8) employing electrostatic spraying processing.
6. portable microcomputer charge protection device according to claim 2 is characterized in that: be provided with shockproof hemisphere sponge in the described case lid (1-1).
7. adopt portable microcomputer charge protection device claimed in claim 1 in charging process, to carry out the method for current protection, it is characterized in that: may further comprise the steps:
Step 1, comprehensive digital relay is carried out initialization, and with line voltage current signal access portable microcomputer charge protection device;
Step 2, the voltage current transducer of described line voltage current signal in comprehensive digital relay gather, after the low-pass filtering, again through variable connector, operational amplifier and limited amplitude protection device, convert the ac voltage signal of the amplitude that meets A/D conversion requirement to, process through the digital quantity input single-chip microcomputer that the A/D conversion produces;
If step 3 input current is greater than the operating current of this protective device, and current duration reaches the operate time of protection, and then execution in step 4; Otherwise return execution in step 2;
Step 4, protective device send trip signal and the alarm signal driving interface circuit to the comprehensive digital relay, drive interface circuit above-mentioned signal is delivered to the exit relay plate, breaker tripping and closing relay contact output trip signal on the exit relay plate, trip signal is sent to the circuit breaker trip loop of circuit-under-test by the tripping operation output wiring terminal; Alarm signal relay contact outputting alarm signal on the exit relay plate, this alarm signal are sent to the alarm loop of circuit-under-test by the tripping operation output wiring terminal; Simultaneously, the CPU in the comprehensive digital relay sends the status signal of tripping operation output wiring terminal to circuit-under-test remote dispatching center, and shows the status signal information of tripping operation output wiring terminal in the comprehensive digital relay LCDs.
8. portable microcomputer charging current according to claim 7 guard method is characterized in that: described operating current scope is 0.2～20 times of rated current, and described operate time, scope was 0s～100s.
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| CN201210294470.4A CN102891532B (en) | 2012-08-17 | 2012-08-17 | Portable microcomputer charging protection device and method |
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|---|---|---|---|
| CN201210294470.4A CN102891532B (en) | 2012-08-17 | 2012-08-17 | Portable microcomputer charging protection device and method |
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| CN102891532B CN102891532B (en) | 2015-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938150A (en) * | 2016-06-02 | 2016-09-14 | 国网河南省电力公司洛阳供电公司 | Breaker online tripping/closing voltage tester casing |
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| CN202260419U (en) * | 2011-09-28 | 2012-05-30 | 山西南自晋能自动化有限公司 | Digital type bus-bar protection device |
| CN202737587U (en) * | 2012-08-17 | 2013-02-13 | 沈阳工程学院 | Portable microcomputer charging protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2619355Y (en) * | 2002-09-13 | 2004-06-02 | 潍坊开发区华为电气有限公司 | Relay protection live check instrument |
| CN202260419U (en) * | 2011-09-28 | 2012-05-30 | 山西南自晋能自动化有限公司 | Digital type bus-bar protection device |
| CN202737587U (en) * | 2012-08-17 | 2013-02-13 | 沈阳工程学院 | Portable microcomputer charging protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105938150A (en) * | 2016-06-02 | 2016-09-14 | 国网河南省电力公司洛阳供电公司 | Breaker online tripping/closing voltage tester casing |
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| CN102891532B (en) | 2015-01-28 |
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