CN201667561U - Backup protection monitor device of a power system transformer - Google Patents
Backup protection monitor device of a power system transformer Download PDFInfo
- Publication number
- CN201667561U CN201667561U CN2010202616922U CN201020261692U CN201667561U CN 201667561 U CN201667561 U CN 201667561U CN 2010202616922 U CN2010202616922 U CN 2010202616922U CN 201020261692 U CN201020261692 U CN 201020261692U CN 201667561 U CN201667561 U CN 201667561U
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- chip microcomputer
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- signal
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Abstract
The utility model relates to a transformer backup protection device for a voltage level of below 110KV, a neutral point earthing side and a small current earthing system, comprising a data collection system, a single-chip microcomputer system, a switch quantity input/output part, a man-machine interaction part and a power supply part. The data collection system isolates and changes the secondary alternative-current signal into the small current or small voltage signal and then is connected with the single-chip microcomputer system after analog/digital conversion; the single-chip microcomputer system processes the analog quantity and switch quantity. The man-machine interaction part is connected with the single-chip microcomputer system by a data standard interface; the power supply part uses a 220V AC/DC double-function switch power supply and output 3 groups of voltages to supply the power for the single-chip microcomputer system, the data collection system and the switch quantity input/output part after being processed by an anti-interference filter loop. The device also uses a self-repairing circuit to detect the program error. The device has features of reliability, safety, economy and practicability.
Description
Technical field
The utility model relates to the transformer backup protection of the following electric pressure of a kind of 110KV of being applicable to, neutral ground side and small current neutral grounding system.Be mainly used in the backup protection and the observing and controlling of electric power system transformer.
Background technology
Transformer is the critical elements in the electric power system, and its safe operation is directly connected to the stability of electric power system and the reliability of user power utilization, therefore need be equipped with reliable, effectively protection to transformer.The transformer backup protection is taken the reserve far away of line fault out of as the nearly reserve of power transformer interior fault and each side bus and bus, and the status is also extremely important.Development along with electronics and computer; though the relaying protection of electric power system has entered the Microcomputer Protection epoch; the chip that present most of transformer backup protection is adopted mostly is 51 and 96 Series chip greatly; this single-chip microcomputer can meet the demands substantially for its performance of protection of routine; but owing to be subjected to the restriction of himself hardware configuration and speed; this single-chip microcomputer is difficult to realize the complicated algorithm that upgrades and reaches higher sampling rate; and these device peripheral chips are many; bus can not be integrated in cpu chip inside, causes the stability of protection and antijamming capability to be subjected to greatly limiting.The accuracy of stability and judgement is not enough because reserve is protected, and the accident that causes all has generation every year, causes having a power failure even burning transformer and miscellaneous equipment on a large scale, and serious threat electric equipment and personal safety cause enormous economic loss.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point; what provide is a kind of stable; highly sensitive, the little transformer backup protection checkout gear that is applicable to the following electric pressure of 110KV, neutral ground side and small current neutral grounding system of protection action delay.
The technical scheme that its technical problem that solves the utility model adopts is such: promptly a kind of backup protection of electric power system transformer and measure and control device; it is characterized in that: it comprises data acquisition system, Single Chip Microcomputer (SCM) system, switching value I/O part, man-machine interaction part and power unit, wherein:
Described data acquisition system comprises that several are installed in voltage transformer summation current transformer, low pass filter and A/D converter on the transmission line; Voltage transformer pt and current transformer CT become big electric current on the transmission line of gathering or big voltage signal into the secondary AC signal, through the low pass filter isolated variable is little electric current or small voltage signal, gives Single Chip Microcomputer (SCM) system and handle after A/D becomes digital signal to analog signal conversion;
Described Single Chip Microcomputer (SCM) system comprises main protection CPU, watchdog circuit, various holders and communication interface, the I/O mouth, the switching value signal that comes is sent in the digital signal of being sent here by data acquisition system A/D that receives and switching value importation handle, the control signal of generation is exported to the switching value output by the I/O mouth and is produced various control operations;
Described switching value I/O part, comprise the output of switching value input and switching value, wherein the switching value input is by the transformer state signal of sensor acquisition, comprise that circuit breaker branch/a close signal, temperature signal, pressure signal, spring energy-storage, fan operation, adjacent side press again, gas state, outside closing locking signal, after the photoelectricity isolation, send into the I/O end of Single Chip Microcomputer (SCM) system and transfer to the Single Chip Microcomputer (SCM) system processing; The control signal that Single Chip Microcomputer (SCM) system I/O end is sent in the output of switching value is connected to the drive circuit of executive component;
Described human-computer dialogue plug-in unit comprises LCD, keyboard, print circuit and real-time clock, by the digital standard interface be connected with Single Chip Microcomputer (SCM) system;
Described power module is exported 3 groups of voltages, and wherein+5V is used for Single Chip Microcomputer (SCM) system, ± 12V is used for data acquisition system, and 24V is used to open into amount and drives the positive supply of relay.
The beneficial effects of the utility model are:
1. system adopts modularized design, that is to say the protection for complete Microcomputer Protection, various circuit and electric main equipment, all press the modularized circuit composition of above-mentioned five parts.Different use occasions constitutes by different modular combination modes.Complete microcomputer protecting device like this can bring great convenience for design, operation and maintenance, debugging.
2. finish nearly all data manipulation with a slice CPU inside; realized that really bus does not go out chip; the reliability and the antijamming capability of Microcomputer Protection have been improved greatly; owing to use the Mitsubishi dsp chip; so the board area that whole hardware designs takies is less; price is also lower, and the algorithm programming also realizes easily.
3. adopt special-purpose self-repairing circuit to come trace routine to overstep the limit, solved in the technology that conventional apparatus adopts, the recovery certainly that program is overstepped the limit and program is overstepped the limit may cause the microcomputer protective relay program to make mistakes under the high reject signal effect.The hardware self-repairing circuit can with the outlet loop of protection action in addition locking prevent misoperation; and reflection program is promptly made mistakes; and can automatically make microcomputer protective relay device can recover normal operation again, prevent protected object in case the problem of the protection of fault appearance at this moment tripping.
Description of drawings
Fig. 1 is a composition structure principle chart of the present utility model;
Fig. 2 is a hardware self-repairing circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail: as shown in Figure 1, the utility model mainly by 1. data acquisition systems, 2. Single Chip Microcomputer (SCM) system, 3. switching value I/O part, 4. the man-machine interaction part, 5. 5 parts of power unit are formed.
First is a data acquisition system, comprises some voltage transformer summation current transformers, low pass filter, A/D converter.Big electric current on the transmission line or big voltage signal become the secondary AC signal behind voltage transformer pt and current transformer CT, be little electric current or small voltage signal through the low pass filter isolated variable, are input to A/D after isolating adjustment.A/D gives the Single Chip Microcomputer (SCM) system processing after analog signal conversion is become digital signal.
Second portion is a Single Chip Microcomputer (SCM) system; it is by main protection CPU; watchdog circuit; various holders and communication interface; the I/O mouth is formed, and the data acquisition system is sent into to the switching value that digital signal and switching value importation are sent to, carries out the computing and the judgement of various protection criterions; produce control signal corresponding then, transfer to the I/O mouth and export to the switching value output and produce various control operations.Described communication interface comprises independent CAN, RS485, and the RS232 interface can connect with human-computer interaction devices such as printer or communication managers by these communication interfaces, constitutes Automation of Electric Systems.
This Single Chip Microcomputer (SCM) system is the core of whole device, finish the processing of analog quantity, switching value, the computing of various protection criterions, judgement, it adopts high performance Mitsubishi dsp chip to constitute simple and high-efficient data acquisition and processing (DAP) system, unique design and advanced surface mounting technology and multilayer board technology have improved the reliability and the antijamming capability of system greatly; Hardware has the two-stage house dog and guarantee that system can in time reset when unusual; Perfect software and hardware self check can also make when system is assorted to be moved and guarantee that various parameters are intact; Preserve definite value, coefficient and configuration with serial EEPROM with multiple write-protect function; guarantee that these parameters are not revised by mistake and can power down keep; CPU can pass through CAN communication and digital transformer substation management system swap data by parallel port and the communication of liquid crystal human-computer dialogue plate.
Third part is a switching value I/O part, comprises the output of switching value input and switching value, and the transformer state signal of sensor acquisition is obtained in the switching value input, comprise circuit breaker deciliter position, temperature signal, pressure anomaly, spring energy-storage, the fan operation, adjacent side is pressed gas state, signals such as outside closing locking again, after the photoelectricity isolation, send into the I/O end of Single Chip Microcomputer (SCM) system and transfer to the Single Chip Microcomputer (SCM) system processing.The control signal that Single Chip Microcomputer (SCM) system I/O end is sent in the output of switching value is connected to the drive circuit of executive component; Single Chip Microcomputer (SCM) system I/O end is sent control signal and is comprised the monitoring divide-shut brake, and fan stops or opens, and adjacent side is jumped in protection, and segmentation etc. is jumped in protection, and these signals are delivered to the corresponding driving circuit, and relevant device can be carried out corresponding operating according to drive circuit port of export signal.
The 4th part is man-machine interactive portion, form by liquid crystal, keyboard, print circuit, real-time clock etc., it accept Single Chip Microcomputer (SCM) system measurement data, switching value data, and various fault warning information browse showing on the LCD screen or on the printer for the user, print result by keyboard operation easily and Chinesizing liquid crystal display and printer, for the user provides friendly use interface, browse measurement data easily, revise definite value and passage coefficient, carry out local operation by this interface energy.System provides detailed fault warning information and the function of recollecting SOE, helps the user to handle problems timely and accurately.
Above-mentioned man-machine interaction part can link to each other with Single Chip Microcomputer (SCM) system by some communication interfaces, such as CAN, RS232, RS485 interface.
The 5th part is a power unit, and adopting star source Feng Tai company model is the Switching Power Supply of the 220V interchange commentaries on classics direct current of " XRA05/110S24 ", adopts floating ground mode, continuous with shell.Power supply has overvoltage protection and overcurrent protection function, and it exports 3 groups of voltages behind the anti-interference filtration loop, and wherein+5V is used for Single Chip Microcomputer (SCM) system, ± 12V is used for data acquisition system, and 24V is used to open into amount and drives the positive supply of relay.
As shown in Figure 2, also comprise self-repairing circuit in the above-mentioned Single Chip Microcomputer (SCM) system 2.This circuit comprises a reverser, one or, 3 delayers, a monostable flipflop, wherein the input of reverser is connected with the reset detection end A of Single Chip Microcomputer (SCM) system 2, its output by a delayer (t1) with or input be connected; The input of another delayer is connected on the input of reverser, the input of its output termination or door; Or the output of door is respectively by monostable flipflop and the 3rd delayer (t3) output reset signal and alarm signal.
When program was not overstepped the limit, the current potential of reset detection end A changed between " 0 " and " 1 " by certain period T.Be divided into two-way from the signal of A point input, the one tunnel through inverter, and another road is connected to two instantaneous returning respectively and the element of the t1 that delays time action without inverter.The output of delay cell is connected to two input t1 of OR-gate should be longer than the period T of A point potential change, therefore can not move at two delay cells just often, and OR-gate is output as " 0 ".In case program is overstepped the limit; A point current potential stops to change; no matter the one state of being parked in or " 0 " attitude; a meeting action is always arranged in two delay cells; the action back is by OR-gate starting monostable trigger; the output pulse of trigger is connected to the reset terminal (RESET) of CPU, thereby protective device is reinitialized, and recovers operate as normal.Foregoing circuit not only can be used to the program that tackles and overstep the limit, and can also be used for that device main element (as CPU, A/D converter etc.) damages and sends alarm signal when quitting work.At this moment, because the reset enable signal A point current potential that sends of monostable trigger can not cyclic variation, so send alarm signal after can utilizing t2 to delay time.
The utility model device is the Backup Protection Device for Transformer of the following electric pressure of a kind of 110KV of being applicable to, neutral ground side and small current neutral grounding system.System adopts standard-sized sheet to put, and the modular construction design can realize protection, measures control, telemechanical; signal, communication, accident record, fault filtering and 5 functions such as anti-have adopted current advanced technology and device; satisfy reliable, safety, economy, practicality, advanced technology and be convenient to basic principle such as expansion.And solved microcomputer device not as the reliable problem of conventional apparatus, can operation reliably and with long-term under adverse circumstances.
The utility model can concentrate group screen also can install on the spot at switch cubicle.
Claims (2)
1. electric power system transformer backup protection measure and control device is characterized in that: it comprises data acquisition system (1), Single Chip Microcomputer (SCM) system (2), switching value I/O part (3), man-machine interaction part (4) and power unit (5), wherein:
Described data acquisition system comprises that several are installed in voltage transformer summation current transformer, low pass filter and A/D converter on the transmission line; Voltage transformer pt and current transformer CT become big electric current on the transmission line of gathering or big voltage signal into the secondary AC signal, through the low pass filter isolated variable is little electric current or small voltage signal, gives Single Chip Microcomputer (SCM) system and handle after A/D becomes digital signal to analog signal conversion;
Described Single Chip Microcomputer (SCM) system (2) comprises main protection CPU, watchdog circuit, various holders and communication interface, the I/O mouth, the switching value signal that comes is sent in the digital signal of being sent here by data acquisition system A/D that receives and switching value importation handle, the control signal of generation is exported to the switching value output by the I/O mouth and is produced various control operations;
Described switching value I/O part (3), comprise the output of switching value input and switching value, wherein the transformer state signal by sensor acquisition is obtained in the switching value input, after isolating by photoelectricity, sends into the I/O end of Single Chip Microcomputer (SCM) system and transfers to the Single Chip Microcomputer (SCM) system processing; The control signal that Single Chip Microcomputer (SCM) system I/O end is sent in the output of switching value is connected to the drive circuit of executive component;
Described human-computer dialogue plug-in unit (4) comprises LCD, keyboard, print circuit and real-time clock, by by the digital standard interface be connected with Single Chip Microcomputer (SCM) system (2);
3 groups of voltages of described power module (5) output, wherein+5V is used for Single Chip Microcomputer (SCM) system, ± 12V is used for data acquisition system, and 24V is used to open into amount and drives the positive supply of relay.
2. electric power system transformer backup protection measure and control device according to claim 1, it is characterized in that: Single Chip Microcomputer (SCM) system also comprises self-repairing circuit in (2), this circuit comprises a reverser, one or, 3 delayers, a monostable flipflop, wherein the input of reverser is connected with the bus of Single Chip Microcomputer (SCM) system (2), its output by a delayer (t1) with or input be connected; The input of another delayer is connected on the input of reverser, the input of its output termination or door; Or the output of door is respectively by monostable flipflop and the 3rd delayer (t3) output reset signal and alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202616922U CN201667561U (en) | 2010-07-16 | 2010-07-16 | Backup protection monitor device of a power system transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202616922U CN201667561U (en) | 2010-07-16 | 2010-07-16 | Backup protection monitor device of a power system transformer |
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| Publication Number | Publication Date |
|---|---|
| CN201667561U true CN201667561U (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202616922U Expired - Lifetime CN201667561U (en) | 2010-07-16 | 2010-07-16 | Backup protection monitor device of a power system transformer |
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| Country | Link |
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| CN (1) | CN201667561U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944807A (en) * | 2012-11-29 | 2013-02-27 | 易恺 | Pressure transformer (PT) circuit ground connection monitoring device |
| CN103105513A (en) * | 2013-01-17 | 2013-05-15 | 广东电网公司电力科学研究院 | Protection device for removing damages caused by random large-signal of detected device on standard device |
| CN103151196A (en) * | 2013-03-04 | 2013-06-12 | 河海大学常州校区 | State indicating instrument of three-working-position operating mechanism of high-voltage switch cabinet and state indicating method thereof |
| CN103399181A (en) * | 2013-08-02 | 2013-11-20 | 甘肃电器科学研究院 | Microcomputer protection device |
| CN104184120A (en) * | 2014-09-11 | 2014-12-03 | 南自晋能自动化有限公司 | High-performance transformer protection device |
-
2010
- 2010-07-16 CN CN2010202616922U patent/CN201667561U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944807A (en) * | 2012-11-29 | 2013-02-27 | 易恺 | Pressure transformer (PT) circuit ground connection monitoring device |
| CN103105513A (en) * | 2013-01-17 | 2013-05-15 | 广东电网公司电力科学研究院 | Protection device for removing damages caused by random large-signal of detected device on standard device |
| CN103105513B (en) * | 2013-01-17 | 2015-09-16 | 广东电网公司电力科学研究院 | Eliminate the protective device that tested equipment output stochastic larger signal damages standard device |
| CN103151196A (en) * | 2013-03-04 | 2013-06-12 | 河海大学常州校区 | State indicating instrument of three-working-position operating mechanism of high-voltage switch cabinet and state indicating method thereof |
| CN103151196B (en) * | 2013-03-04 | 2015-04-22 | 河海大学常州校区 | State indicating instrument of three-working-position operating mechanism of high-voltage switch cabinet and state indicating method thereof |
| CN103399181A (en) * | 2013-08-02 | 2013-11-20 | 甘肃电器科学研究院 | Microcomputer protection device |
| CN103399181B (en) * | 2013-08-02 | 2016-03-16 | 甘肃电器科学研究院 | Microcomputer protecting device |
| CN104184120A (en) * | 2014-09-11 | 2014-12-03 | 南自晋能自动化有限公司 | High-performance transformer protection device |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101208 |
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| CX01 | Expiry of patent term |