CN202231422U

CN202231422U - Digital line protection device

Info

Publication number: CN202231422U
Application number: CN2011203711878U
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: 2012-05-23
Anticipated expiration: 2021-09-28

Abstract

The utility model provides a digital line protection device, which belongs to the technical field of high voltage line protection. All function units are modularized and standardized and are integrated on a box body in plugin mode, all plugins do not interfere with each other, and a whole working process can be shown out. The technical scheme is that a DI input unit, an AD sampling unit, a DO output unit, a communication unit and a power supply unit are all modularly integrated, the DI input unit, the AD sampling unit, the DO output unit, the communication unit and the power supply unit are fixed on a back plate of the box body through the modular integration, and an industrial tablet personal computer is fixed on a front panel of the box body. The digital line protection device can achieve functions of distance protection, zero-sequence protection and three-phase once reclosing protection.

Description

Digital line protective devices

Technical field

The digital line protective devices of the utility model, this device is suitable for 11OKV, 66KV or 35 KV outlet lines, can disperse to be contained in control circuit near, have the function of monitoring and protection, belong to the high-voltage line protection technical field.

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 line protective devices are 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 address the above problem, the scheme that the utility model adopts is: digital line protective devices, and industrial panel computer links to each other with power subsystem with DI input unit, AD sampling unit, DO output unit, communication unit respectively through lead; It is integrated that said DI input unit, AD sampling unit, DO output unit, communication unit and power subsystem are modularization; DI input unit, AD sampling unit, DO output unit, communication unit and power subsystem are all through on the integrated backboard that is fixed on casing of modularization; The industry panel computer is fixed on the front panel of casing.

Above-mentioned front panel middle and upper part left side 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 the safe brace of debugging, ground connection branch/close handle and operational mode diverter switch from left to right.

The top of above-mentioned backboard is disposed with voltage handover module, alternating current conversion module, A/D modular converter, first standby plate and second standby plate from left to right; The bottom of backboard is disposed with communication interface module, power module, signaling module, circuit breaker position module, breaker tripping and closing outlet module from left to right.

The digital line protective devices of the utility model compared with prior art have 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, can realize the defencive function of distance protection, zero-sequenceprotection and three-phase single shot reclosing according to user's request.

Description of drawings

Below in conjunction with accompanying drawing the digital line protective devices of the utility model are further specified:

Fig. 1 is the system block diagram of the digital line protective devices of the utility model;

Fig. 2 is the hardware configuration sketch map of the digital line protective devices of the utility model;

Fig. 3 is the structural representation of digital line protective devices dorsulum 10 shown in Figure 2.

Among the figure: 1 is panel computer; 2 is the DI input unit; 3 is the AD sampling unit; 4 is the DO output unit; 5 is communication unit; 6 is power subsystem; 7 is outlet line; 8 is cut-off relay; 9 is casing; 10 is backboard; 11 is front panel; 12 is indicator light; 13 are the safe brace of debugging; 14 are ground connection branch/close handle; 15 is the operational mode diverter switch; 16 is the voltage handover module; 17 is the alternating current conversion module; 18 is the A/D modular converter; 19 is first standby plate; 20 is second standby plate; 21 is that communication interface module, 22 is that power module, 23 is that signaling module, 24 is that circuit breaker position module, 25 is the breaker tripping and closing outlet module.

Embodiment

Extremely shown in Figure 3 like Fig. 1, the digital line protective devices of the utility model, industrial panel computer 1 links to each other with DI input unit 2, AD sampling unit 3, DO output unit 4, communication unit 5 and power subsystem 6 respectively through lead; AD sampling unit 3 is gathered the electric current and the voltage data of outlet line 7 through signal picker, and DO output unit 4 links to each other with cut-off relay 8 on the outlet line 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; DI input unit 2, AD sampling unit 3, DO output unit 4, communication unit 5 and power subsystem 6 are all through on the integrated backboard 10 that is fixed on casing 9 of modularization; Industry panel computer 1 is fixed on the front panel 11 of casing 9.

Left side, above-mentioned front panel 10 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.

The top of above-mentioned backboard 10 is disposed with voltage handover module 16, alternating current conversion module 17, A/D modular converter 18, first standby plate 19 and second standby plate 20 from left to right; The bottom of backboard 10 is disposed with communication interface module 21, power module 22, signaling module 23, circuit breaker position module 24, breaker tripping and closing outlet module 25 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.

Above-mentioned voltage handover module 16 is provided with the 1X01-1X34 binding post, amounts to 34; Wherein the 1X01-1X22 binding post is provided with the left side, and the 1X23-1X34 binding post is provided with the right side; Include two groups of bus disconnecting links and close position and the input terminal that divides the position;-KM operates negative power end; Two groups of busbar voltages are switched output wiring terminal; Two groups of unusual output wiring terminals of busbar voltage switching position; Two groups of busbar voltage inputs; Two groups of busbar voltage outputs.

Above-mentioned alternating current conversion module 17 is provided with the 2X01-2X10 binding post, amounts to 10, all is arranged on the left side, and the right side is provided with the binding post busbar of forceful electric power; The conversion of 4 power pack LH difference is the magnitude of current of four road binding posts wherein; The conversion of 4 voltage changer YH difference is the voltage of four road binding posts wherein; Alternating current conversion module 17 also can install three drive test magnitude power packs additional; Line attachment is measured CT, is used for line current, power etc. and measures usefulness.

Above-mentioned A/D modular converter 18 keeps S/H, analog switch MUX, mould/number conversion A/D and microprocessor to constitute by active low-pass filter, sampling; Wherein mould/number conversion A/D adopts 16 high accuracy, high stability device; Accurately operating current can reach 0.04In; Accurately operating voltage reaches 0.2V, and the operation precision that improves distance protection reaches the application power at short-term; The attenuation rate of each analog quantity and phase shift all can reach good consistency, but mould/number conversion A/D data tape verifying sign indicating number is delivered to each CPU through serial mode with data, has ideally solved a plurality of CPU shared data acquisition systems.

Above-mentioned communication interface module 21 is provided with the 7X01-7X18 binding post; Amount to 18, upper left-hand is provided with the 7X01-7X10 binding post, and upper right is provided with the 7X11-7X18 binding post; The middle and lower part is provided with printer port, and the bottom is provided with two Ethernet interfaces.

Above-mentioned power module 22 upper left-hand are provided with the 8X01-8X12 binding post, amount to 12, and the middle part is provided with+5V and+24V power supply, the right side, bottom is provided with mains switch.

Above-mentioned signaling module 23 upper left-hand are provided with the 9X01-9X22 binding post; Amount to 22, wherein comprise two groups of guard signals, can be respectively as central signal and remote motion signal; The output of tripping operation exit relay; Overlap the output of tripping operation exit relay, back output is closed in tripping operation, starts malfunctioning relay output and tripping operation exit relay contact polyphone.

Above-mentioned circuit breaker position module 24 is provided with the 10X01-10X22 binding post, amounts to 22, wherein comprises trip position, closing position input, six groups of breaker tripping and closing position contact outputs, the output of two groups of control loop broken string contacts.

Above-mentioned breaker tripping and closing outlet module 25 is provided with the 11X01-11X22 binding post; Amount to 22; 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.

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

Claims

1. digital line protective devices, industrial panel computer (1) links to each other with DI input unit (2), AD sampling unit (3), DO output unit (4), communication unit (5) and power subsystem (6) respectively through lead; 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; DI input unit (2), AD sampling unit (3), DO output unit (4), communication unit (5) and power subsystem (6) are all through on the integrated backboard (10) that is fixed on casing (9) of modularization; Industry panel computer (1) is fixed on the front panel (11) of casing (9).

2. digital line protective devices according to claim 1; It is characterized in that: left side, above-mentioned front panel (10) 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.

3. digital line protective devices according to claim 2 is characterized in that: the top of above-mentioned backboard (10) is disposed with voltage handover module (16), alternating current conversion module (17), A/D modular converter (18), first standby plate (19) and second standby plate (20) from left to right; The bottom of backboard (10) is disposed with communication interface module (21), power module (22), signaling module (23), circuit breaker position module (24), breaker tripping and closing outlet module (25) from left to right.