CN202260419U

CN202260419U - Digital type bus-bar protection device

Info

Publication number: CN202260419U
Application number: CN2011203712870U
Authority: CN
Inventors: 赵张锋
Original assignee: SHANXI NANZI JINNENG AUTOMATION CO Ltd
Current assignee: Nanzi Jinneng Automation Co., Ltd.
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-05-30
Anticipated expiration: 2021-09-28

Abstract

The utility model relates to a digital type bus-bar protection device, belonging to the technical field of the high-pressure bus-bar protection. All function units are modularized and standardized to be integrated on a box body in an inserter way, the inserters are not interfered with each other and the whole operation process can be displayed. A DI input unit, an AD sample unit, a DO output unit, a communication unit and a power supply unit are modularly integrated, the DI input unit, the AD sample unit, the communication unit and the power supply unit are modularly integrated and fixed on a back plate of the box body, an industry tablet computer is fixed on a front panel of the box body. The digital type bus-bar protection device can realize the charging protection, the over-current protection, failure start protection and in-phase switching-on function.

Description

Digital female protective device that joins

Technical field

The digital female protective device that joins of the utility model, this device is protection and the monitoring integrated apparatus that aims at the busbar sectional izing switch design of 10kV-110kV electric pressure, belongs to the female resist technology field that joins of high pressure.

Background technology

Comprehensive automation of electric power system has been the direction of power network development; The development of microelectronic element makes protection and the monitoring possibility that combined together; Can improve its reliability and operation and management level; But use microcomputer that many unfavorable factors are also arranged in transformer station, the for example interference of high-voltage electromagnetic field has strong vibration during the transformer substation switch operation; The deterioration of installation environment has proposed higher requirements such as vibrationproof, wide temperature range, low-power consumption, anti-interference, high sensitivity, high accuracy, functional reliability, installation and maintenance are convenient to Microcomputer Protection on the spot, and these difficult problems all are not resolved in existing microcomputer protecting device.

The utility model content

In order to overcome the problem that prior art exists; The utility model problem to be solved is: a kind of digital female protective device that joins is provided; All modularization and standardization are integrated on the casing with the mode of plug-in unit with all functions unit; Mutually interference-free between each plug-in unit, entire work process can show, make whole device highly sensitive, precision is high, functional reliability is high, installation and maintenance are convenient.

In order to solve the problems of the technologies described above, the scheme that the utility model adopted is: digital female protective device that joins, industrial panel computer through lead respectively with DI input unit, AD sampling unit, DO output unit, communication unit links to each other with power subsystem; It is integrated that said DI input unit, AD sampling unit, DO output unit, communication unit and power subsystem are modularization; All through on the integrated backboard that is fixed on casing of modularization, industrial panel computer is fixed on the front panel of casing for DI input unit, AD sampling unit, DO output unit, communication unit and power subsystem.

Be disposed with logic and tripping operation plug-in unit, power module, signaling module, breaker tripping and closing outlet module, communication interface module, interchange input module on the above-mentioned backboard from left to right.

The left side of above-mentioned front panel middle and upper part is provided with industrial panel computer, and the right side of industrial panel computer is provided with indicator light, and the below of industrial panel computer is provided with debugging safe brace, ground connection branch/close handle and operational mode diverter switch from left to right.

The digital female protective device that joins of the utility model compared with prior art has following beneficial effect:

The all functions unit of this device all modularization and standardization is integrated on the casing with the mode of plug-in unit; Have only inner 5V and the 24V electric pressure loop line that uses on the casing; Strong and weak electricity separates fully; Can significantly reduce the coupling of external electromagnetic interference, strengthen the antijamming capability of this device, improve its reliability and fail safe in weak-feedback side of transmission line.Make this device on functional configuration, have very strong flexibility, can change or the increase part of module, expand or change the function of this device according to user's request; This device can be realized charge protection, overcurrent protection, malfunctioning startup protection and asynchronous switch-on function.

Description of drawings

Below in conjunction with accompanying drawing the digital female protective device that joins of the utility model is done further detailed explanation.

Fig. 1 is the digital female system block diagram that joins protective device of the utility model;

Fig. 2 is the digital female hardware configuration sketch map that joins protective device of the utility model;

Fig. 3 is digital female structural representation that joins protective device backboard 10 shown in Figure 2.

Among the figure, 1 for panel computer, 2 for the DI input unit, 3 for the AD sampling unit, 4 for the DO output unit, 5 for communication unit, 6 for power subsystem, 7 for female join, 8 for relay, 9 for casing, 10 for backboard, 11 for front panel, 12 for indicator light, 13 for the safe brace of debugging, 14 for ground connection branch/close handle, 15 for the operational mode diverter switch, 16 for logic and tripping operation plug-in unit, 17 for power module, 18 for signaling module, 19 for the breaker tripping and closing outlet module, 20 for communication interface module, 21 for exchanging input module.

Embodiment

Like Fig. 1 to shown in Figure 3, the digital female protective device that joins of the utility model, industrial panel computer 1 through lead respectively with DI input unit 2, AD sampling unit 3, DO output unit 4, communication unit 5 links to each other with power subsystem 6; AD sampling unit 3 is gathered female electric current and voltage data of 7 of joining through signal picker, and DO output unit 4 links to each other with the relay 8 that mother joins on 7; It is integrated that said DI input unit 2, AD sampling unit 3, DO output unit 4, communication unit 5 and power subsystem 6 are modularization; All through on the integrated backboard 10 that is fixed on casing 9 of modularization, industrial panel computer 1 is fixed on the front panel 11 of casing 9 for DI input unit 2, AD sampling unit 3, DO output unit 4, communication unit 5 and power circuit unit 6.

Be disposed with logic and tripping operation plug-in unit 16, power module 17, signaling module 18, breaker tripping and closing outlet module 19, communication interface module 20 on the above-mentioned backboard 12 from left to right, exchange input module 21.

The left side of front panel 11 middle and upper parts is provided with industrial panel computer 1; The right side of industry panel computer 1 is provided with indicator light 12, and the below of industrial panel computer 1 is provided with the safe brace of debugging 13, ground connection branch/close handle 14 and operational mode diverter switch 15 from left to right.

After industry panel computer 1 obtains the digital signal of sampling; Carry out the amplitude information of digital filtering and algorithm computing acquisition analog quantity; Respectively through the logic determines of protection software module, show to handle, links such as report storage, record ripple, after satisfying the protection operation condition, send orders such as tripping operation, signal to outlet loop; Initialization in the main program mainly is that whole system is that operate as normal is ready, and for the main transformer protection device, main program mainly comprises: industrial panel computer 1 initialization and to the necessary parameter default settings; Main program got into operating state after initialization was accomplished, and showed on the computer screen at first to judge whether relevant menu to carry out fixed value adjusting work, then changed the fixed value adjusting module if desired over to, otherwise continued to carry out downwards; Gathering switching value and detecting in the screen key link; If detect the switching value displacement or have screen key to be pressed; Then send information and change message processing module over to and handle by main program; The result of information processing is sent to computer screen again and shows, otherwise program continues to carry out signals collecting and computing module downwards; Whether needs move logic judgment module according to the relevant condition judgment with other of the calculated value of voltage power-less; After logic judgment module produces action command; Whether move through the checkout gear exit relay, and the state that detects measured equipment judges whether action command obtains correct execution, if correct execution then change circulation next time over to; Handle otherwise this abnormal information is sent to message processing module, again the result is presented on the computer screen.

DI input unit 2 is the input variable from external connector, after input circuit photoelectricity is isolated, to industrial panel computer 1 input, judges anti-interference process through software logic through tri-state gate circuit, obtains the input variable signal; The 24V signal power source that external switch amount (idle contact) taking device provides; Through the resistance current limliting; Be input to the input of optical isolator, the output of optical isolator is taken inner 5V power supply, is linked into 8 road triple gate devices; Read " 0 " or the one state of signal by industrial panel computer 1 through bus, to differentiate the switching situation of external connector; Adopting optical isolator that the outside is opened into power supply and inner 5V power supply does not have direct electrical link, has effectively eliminated the influence of external electromagnetic interference to industrial panel computer 1 internal circuit, improved reliability.

AD sampling unit 3 realizes that multichannel exchanges the analog-to-digital conversion of analog signal, and to industrial panel computer 1 real-time high-precision digital signal is provided; Electric weight in the electric power system generally all is an analog quantity, and the realization of digital relay protection then is based on by microcomputer and digital quantity is calculated and judges; So, must carry out series of preprocessing to simulation electric weight, thereby the digital quantity that obtains desired form offers the defencive function handling procedure from protected location equipment in order to realize the computer relaying protection; In the circuit design of AD sampling unit 3, set up the LPF loop that the two-stage Resistor-Capacitor Unit constitutes; The analog quantity input signal is through the LPF loop; Respectively signal is inserted the input of two multicircuit switch devices, the output signal of multicircuit switch is passed to the input circuit of AD conversion chip respectively, carries out analog-to-digital conversion; Regularly read the result of AD conversion by industrial panel computer 1, as the original sampling data of each road analog quantity.

DO output unit 4 is carried out the outlet action command that is sent by industrial panel computer 1, and through the input circuit of AND circuit to optical isolator, the output of optical isolator drives the actuating of relay through unilateral diode; The importation of optical isolator is industrial panel computer 1 inner 5V power supply, and output is the 24V power supply, in order to drive the 24V relay; Isolate industrial panel computer 1 internal circuit and relay drive circuit through optical isolator, effectively prevented electromagnetic interference, improved the reliability of hardware circuit; For guaranteeing the reliability of outlet loop, adopted multinomial locking measure:, adopt hardware watchdog locking outlet etc. as adopting the open outlet of starting component positive supply; When industry panel computer 1 sends the outlet order, must send the unlocking signal, drive starting relay simultaneously and can drive exit relay, send trip signal.

Logic and tripping operation plug-in unit 16 are provided with the 1X01-1X24 binding post; Amount to 24, specifically comprise: pressure is low forbids that the input contact, the input contact of the low quiescing of pressure, the input contact of the low No switching on of pressure, hand trip(ping) input contact, closing by hand input contact, control power supply input contact, the hand that trip are jumped the relay output contact, the outlet contact that closes a floodgate, jump a position relay output contact, remote motion signal contact, the heavy movable contact in breaker closing position, the heavy movable contact in circuit breaker trip position, tripping operation outlet contact, close a relay tip, tripping operation inlet contact.

Power module 17 is provided with the 2X01-2X12 binding post, amounts to 12, and the middle part is provided with+5V and+24V power supply, the right side, bottom is provided with mains switch.

Signaling module 18 is provided with the 3X01-3X24 binding post, amounts to 24, wherein comprises two groups of guard signals, can be respectively as central signal and remote motion signal, and remote control is closed a floodgate and is exported contact, remote control tripping operation outlet contact, and the remote control spare contact.

Breaker tripping and closing outlet module 19 is provided with the 4X01-4X24 binding post; Amount to 24; Wherein comprise the input and output of controlling power supply; The input of hand branch, hand combined floodgate cutter, protection are closed a floodgate and are closed a floodgate without pressure atresia combined floodgate access point, closing coil access point, pressure low No switching on, quiescing, forbid the input of tripping, two groups of pressure atresia normal opened contacts through pressure atresia combined floodgate access point, protection.

Communication interface module 20 is provided with the 5X01-5X12 binding post, amounts to 12, and the bottom is provided with two Ethernet interfaces.

Stream input module 21 is provided with the 7X01-7X24 binding post, amounts to 24, and wherein the left side is provided with the 7X13-7X24 binding post; The right side is provided with the 7X01-7X12 binding post; Comprising the three-phase input for protection CT, the input of zero-sequenceprotection CT, the input of measuring CT; The input of busbar voltage three-phase and zero line, the line voltage distribution input.

The utility model has adopted real-time sampling and calculating, the pattern that protection has got into exception handles after having adopted and having started again.

The first, protection starting component: a>three difference of phase currents starting components: when arbitrary difference of phase currents continuous three times when starting door, protection starts; B>zero-sequence current surmounts the limit starting component: when zero-sequence current surmounted the definite value of starting component, protection started; C>residual voltage surmounts the limit starting component: when residual voltage surmounted the definite value of limitting starting component, protection started.

Second; Charge protection: a>composite voltage locking overcurrent protection; Be also referred to as alternate protection: the composite voltage blocking element is made up of low-voltage, negative sequence voltage, open and protection when arbitrary line voltage is lower than definite value or negative sequence voltage and is higher than definite value, and the composite voltage element can be thrown and move back.The three-phase type overcurrent is adopted in overcurrent protection, the relation of logic OR, and through the time-delay outlet, switch closes the back by a minute change and drops into automatically, withdraws from automatically through delaying time; B>overcurrent protection of residual voltage locking zero sequence, be also referred to as ground protection:, start the protection of residual voltage blocking element when self-produced residual voltage during greater than zero sequence blocking voltage set point; When zero-sequence current during, start the protection of zero sequence overcurrent element greater than the current ration of zero sequence overcurrent; C>logic of charge protection: when charged bus closes a floodgate charging to the aircraft carrier line, if the aircraft carrier line is by fault, for keeping system stability; Need rapid tripping block switch; The charge protection comparison of adjusting on the definite value again is sensitive for this reason, and it is extremely short delay time, differently on definite value the protection cooperation occurs; Charge protection can only drop into when charging in short-term, withdraws from subsequently.

The 3rd, overcurrent protection: during the sectionalized bus paired running,, need selectable tripping block switch, be provided with syllogic for this reason and press off lock overcurrent protection and syllogic zero-pressure locking overcurrent protection again like fault.

The 4th, malfunctioning startup protection: after the protection tripping operation outlet, through malfunctioning startup delay time, electric current moves in malfunctioning startup still greater than malfunctioning startup definite value, and former during this period protection tripping operation outlet is not regained.

The 5th, asynchronous switch-on: when two sections buses are connected to different system, might have the asynchronous switch-on requirement, for differentiating the same period,

Need both sides voltage be introduced this device, insert four groups of voltages: the three-phase of one section busbar voltage in the time of respectively, be used for rated output and voltage blocking, another group is a phase voltage of second section bus; Through comparing the difference in magnitude of both sides voltage; The phase difference of both sides voltage; The difference on the frequency of both sides and both sides frequency change are poor, and whether these less than set point, thereby confirm as the entry condition of asynchronous switch-on.

The 6th, secondary circuit self check: to the broken string of CT secondary, imbalance (< 80%), inverted sequence; Abnormal states such as the broken string of PT secondary, three-phase pressure loss, inverted sequence are kept watch on.

The control principle and the circuit of the utility model are connected to prior art.

Claims

1. digital female protective device that joins; Industry panel computer (1) through lead respectively with DI input unit (2), AD sampling unit (3), DO output unit (4); Communication unit (5) links to each other with power subsystem (6); It is characterized in that: it is integrated that said DI input unit (2), AD sampling unit (3), DO output unit (4), communication unit (5) and power subsystem (6) are modularization; All through on the integrated backboard (10) that is fixed on casing (9) of modularization, industrial panel computer (1) is fixed on the front panel (11) of casing (9) for DI input unit (2), AD sampling unit (3), DO output unit (4), communication unit (5) and power subsystem (6).

2. digital female protective device that joins according to claim 1 is characterized in that: be disposed with logic and tripping operation plug-in unit (16), power module (17), signaling module (18), breaker tripping and closing outlet module (19), communication interface module (20) on the above-mentioned backboard (10) from left to right, exchange input module (21).

3. digital female protective device that joins according to claim 2; It is characterized in that: the left side of above-mentioned front panel (11) middle and upper part is provided with industrial panel computer (1); The right side of industry panel computer (1) is provided with indicator light (12), and the below of industrial panel computer (1) is provided with debugging safe brace (13), ground connection branch/close handle (14) and operational mode diverter switch (15) from left to right.