CN203911464U - High-sensitivity multifunctional CT circuit opening protecting device - Google Patents
High-sensitivity multifunctional CT circuit opening protecting device Download PDFInfo
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- CN203911464U CN203911464U CN201420203900.1U CN201420203900U CN203911464U CN 203911464 U CN203911464 U CN 203911464U CN 201420203900 U CN201420203900 U CN 201420203900U CN 203911464 U CN203911464 U CN 203911464U
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Abstract
A high-sensitivity multifunctional CT circuit opening protecting device relates to the field of protective devices for electric power line, equipment, etc. The high-sensitivity multifunctional CT circuit opening protecting device is characterized in that: the high-sensitivity multifunctional CT circuit opening protecting device comprises a signal sampling part, a protecting executing part, a single-chip microcomputer, a liquid crystal display part and a fault resetting part. Besides a basic fault display function and a total fault number-of-times recording function, the CT circuit opening protecting device provided by the utility model has functions of: displaying and recording voltage magnitude and voltage waveform at the fault time, providing basis for checking whether unrecoverable damage of a device connected with the secondary side of a current transformer occurs because of an open-circuit voltage of the secondary side by personnel, facilitating fault checking on whole-set equipment of the current transformer, and saving maintenance time and labor cost.
Description
Technical field:
The utility model relates to the protective device such as power circuit, equipment field, specifically the multi-functional CT open-circuit protecting device of a kind of high sensitivity.
Background technology:
The safe operation of power circuit, closely bound up with the construction of national economy and personnel's safety.Current transformer is to provide a kind of facility that can reflect the corresponding current parameters of system for detecting instrument and control device, and the safe operation of electric power system is very important, operation rule regulation: in service, Current Transmit secondary side circuit can not be opened a way.The open circuit once Current Transformer Secondary winding and loop thereof are in operation, will produce the overvoltage of thousands of volts volts even up to ten thousand.This works the mischief not only to the insulation of electrical secondary system, also can make the too drastic and scaling loss of instrument transformer, the life security that even jeopardizes operations staff.
For these problems, many technical work personnel work it out many contributions, for example: application number 89216913.3, notification number CN2074493U, utility model title: Installation of Open-circuit Protection for Current Transformers; Application number 00229882.1, notification number CN2602931Y, utility model title: silicon controlled open circuit protector for electric power current transformer; Application number 200420010869.6, notification number CN2715407Y, utility model title: CT open circuit protector with high sensitivity etc., although some protective devices are obtained certain effect after coming into operation at present, protective device still has problems:
The fault detection part of existing Installation of Open-circuit Protection for Current Transformers is used pure hardware detecting circuit; select optocoupler to judge device as fault; being input to single-chip microcomputer or other protection action triggers circuit is low and high level signal; cannot be in the time that current transformer be opened a way record trouble moment voltage and false voltage waveform; thereby cannot cause expendable damage by the failure judgement possibility pair device relevant to instrument transformer, be unfavorable for being equipped with the malfunction elimination of current transformer complete equipment.
Utility model content:
In order to overcome above-mentioned the deficiencies in the prior art, the utility model is designed the multi-functional CT open-circuit protecting device of a kind of high sensitivity.This programme is intended to solve the problem that prior art cannot be monitored instrument transformer open circuit voltage and be preserved fault moment waveform.
The technical problem solving adopts following technical scheme:
The multi-functional CT open-circuit protecting device of a kind of high sensitivity, is characterized in that: contain signal sampling part, carry out protection part, single-chip microcomputer and liquid-crystal display section and failure reset part;
Described signal sampling part is: input voltage, through two divider resistances, is connected with Order RC filter; TVS pipe of a parallel connection in divider resistance; Order RC filter is connected with signal input amplifier, by the voltage of raising accessing in signal amplifier circuit, sampling input voltage is raised, and realizes the sampling to AC signal; The output of signal input amplifier is connected with the AD sampling pin of single-chip microcomputer through protective circuit of diode;
Described execution protection part is: driving power is connected with the input anode of optical coupling isolator through the first resistance; Single-chip microcomputer delivery outlet connects the input negative terminal of optical coupling isolator; Optical coupling isolator output one end the second resistance connects the gate leve of bidirectional triode thyristor, another termination bidirectional triode thyristor; Two pins beyond the gate leve of bidirectional triode thyristor connect respectively input and common port;
Described liquid-crystal display section: the AD sampling functions of single-chip microcomputer and the programming of single-chip microcomputer realize, and LCD LCDs is selected in display section, and displaying contents has: 20ms voltage waveform and total failare number of times before fault phase, fault moment magnitude of voltage, fault moment.
Described failure reset part is: one group of power supply comprises VCC, GND, and second group of power supply comprises VCC1, GNDA, and VCC, GND are directly connected by common mode inductance with VCC1, two groups of power supplys of GNDA, and VCC1 is connected with capacitance cathode, and GND is connected with electric capacity negative pole; Capacitance cathode is connected with bipod and interface of external reset of reset key through the 3rd resistance; The another bipod of reset key and another interface of external reset are connected with the positive pole of optocoupler input; The negative pole of electric capacity is connected with the negative pole of optocoupler input; Optocoupler output collector electrode connects the input port of single-chip microcomputer, meets power supply VCC through pull-up resistor simultaneously; Optocoupler output emitter connects GND end.
Described signal input signal amplifier circuit comprises amplifier, be connected to the resistance R 6 on amplifier negative pole, be connected to the resistance R 7 of amplifier negative pole and amplifier out, and be connected to the resistance R 8 on amplifier anode, the negative pole of described amplifier is connected with the resistance output of Order RC filter, and described resistance R 8 is connected with the electric capacity output of Order RC filter with the other end of amplifier.
The beneficial effects of the utility model are:
(1) the utility model sampling input port adopts connect with the small resistor principle of dividing potential drop of a large resistance, and resistance value is very large, has effectively reduced CT secondary side and has shunted;
(2) the utility model protective device voltage sample is accurate, highly sensitive;
(3) the utility model protective device antijamming capability is strong, and system power supply part is used integrated AC-DC modular power, and system is more stable;
(4) the utility model CT open-circuit protecting device is adaptable for multiloop protective device, can be according to CT secondary winding quantity arbitrary extension;
(5) the utlity model has 485 communication functions, installed signal transmission interface additional, can realize and the networking of comprehensive automation control appliance, greatly increased automaticity;
(6) the utility model CT protective device is except basic fault Presentation Function and total failare number of times writing function; show and writing function with fault moment magnitude of voltage and voltage waveform; for investigating the device being connected with Current Transformer Secondary side, staff whether can cause expendable damage that foundation is provided because of secondary side open circuit voltage; facilitate the malfunction elimination that is equipped with the complete equipment of current transformer, saved repair time and human cost.
Brief description of the drawings:
Fig. 1 is the utility model structural representation.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 1,
The multi-functional CT open-circuit protecting device of a kind of high sensitivity, contains signal sampling part, carries out protection part, single-chip microcomputer and liquid-crystal display section and failure reset part;
Signal sampling part is: input voltage is through two divider resistance R1 and R2, and input voltage, through divider resistance R1 and R2, is connected with Order RC filter; The upper TVS pipe in parallel of divider resistance R2, protection sample circuit; Order RC filter is connected with signal amplifier circuit, raises voltage VRef by what access in signal amplifier circuit, and sampling input voltage is raised, and realizes the sampling to AC signal; The output of signal input signal amplifier circuit is connected with Chip Microcomputer A/D sampling pin through protective circuit of diode.
Secondary winding input voltage is after R1 and R2 dividing potential drop; voltage on R2 carries out filtering through Order RC filter circuit; again through signal amplifier circuit voltage by integral raising; raising voltage magnitude is VRef; signal amplifier circuit is exported after diode clamp protective circuit; be input to Chip Microcomputer A/D thief hatch, calculate the input voltage value of secondary winding reality by mcu programming.Principle and the method calculated are as follows: the input voltage of the input of protector is VIN, more than the alternating voltage of input is raised to zero volt by VRef, has ensured that single-chip microcomputer still can normally carry out AD conversion work in the time that VIN is negative value.The magnitude of voltage that is input to Chip Microcomputer A/D thief hatch is
the pass of deriving thus the voltage of Current Transformer Secondary side virtual voltage and Chip Microcomputer A/D mouth is
Carrying out protection part is: driving power VCC is connected with the input anode of optical coupling isolator through the first resistance 1R; Single-chip microcomputer delivery outlet connects the input negative terminal of optical coupling isolator; Optical coupling isolator output one end the second resistance 2R connects the gate leve of bidirectional triode thyristor BT136, another termination bidirectional triode thyristor BT136; Two pins beyond the gate leve of bidirectional triode thyristor BT136 connect respectively input and common port.
When CT normally works; secondary winding input voltage is lower; single-chip microcomputer sampling calculates secondary winding input voltage value and is less than startup value; single-chip microcomputer delivery outlet in drive circuit is output as high level; triode ac switch in optical coupling isolator cannot conducting; the bidirectional triode thyristor gate leve of CT short circuit effect, without driving signal, is not protected action.When CT open circuit; secondary winding input voltage is very large; single-chip microcomputer sampling calculates secondary winding input voltage value and is greater than startup value; single-chip microcomputer delivery outlet in drive circuit is output as low level; triode ac switch conducting in optical coupling isolator; the bidirectional triode thyristor gate leve signal that drives CT short circuit effect, bidirectional triode thyristor is protected action.
Liquid-crystal display section: the AD sampling functions of single-chip microcomputer and the programming of single-chip microcomputer realize, LCD LCDs is selected in display section, and displaying contents has: 20ms voltage waveform (comprising fault moment) and total failare number of times before fault phase, fault moment magnitude of voltage, fault moment.
Failure reset part is: one group of power supply comprises VCC, GND, and second group of power supply comprises VCC1, GNDA, and in Fig. 1, VCC, GND are directly connected by common mode inductance with VCC1, two groups of power supplys of GNDA.VCC1 is connected with capacitance cathode, and GND is connected with electric capacity negative pole; Capacitance cathode is connected with 1,3 pin of reset key SW and 5 pin of external reset interface through resistance SW_R1; 2,4 pin of reset key SW and 6 pin of external reset interface are connected with the positive pole of optocoupler input; The negative pole of electric capacity is connected with the negative pole of optocoupler input; Optocoupler output collector electrode connects the input port of single-chip microcomputer, meets power supply VCC through pull-up resistor SW_R2 simultaneously; Optocoupler output emitter connects GND end.
External reset interface is not in the time that off-state and reset key are pressed, and optocoupler input anode is unsettled, and optocoupler is not worked, and its output is equivalent to off state, single-chip microcomputer input port input high level; When external reset interface is in the time that short circuit state or reset key are pressed, optocoupler work, output is equivalent to path, single-chip microcomputer input port input low level.Single-chip microcomputer judges that this pin becomes low level from high level, and the state of the inner each quantity of state that resets is to init state, and faulty indication etc. are eliminated.
Signal input signal amplifier circuit comprises amplifier, be connected to the resistance R 6 on amplifier negative pole, be connected to the resistance R 7 of amplifier negative pole and amplifier out, and be connected to the resistance R 8 on amplifier anode, the negative pole of amplifier is connected with the resistance output of Order RC filter, and resistance R 8 is connected with the other end of amplifier and the electric capacity output of Order RC filter.
More than show and described general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. the multi-functional CT open-circuit protecting device of high sensitivity, is characterized in that: contain signal sampling part, carry out protection part, single-chip microcomputer and liquid-crystal display section and failure reset part;
Described signal sampling part: input voltage, through two divider resistances, is connected with Order RC filter; TVS pipe of a parallel connection in divider resistance; Order RC filter is connected with signal input signal amplifier circuit, by the voltage of raising accessing in signal amplifier circuit, sampling input voltage is raised, and realizes the sampling to AC signal; Signal amplifier circuit output is connected with the AD sampling pin of single-chip microcomputer through protective circuit of diode;
Described execution protection part is: driving power is connected with the input anode of optical coupling isolator through the first resistance; Single-chip microcomputer delivery outlet connects the input negative terminal of optical coupling isolator; Optical coupling isolator output one end the second resistance connects the gate leve of bidirectional triode thyristor, another termination bidirectional triode thyristor; Two pins beyond the gate leve of bidirectional triode thyristor connect respectively input and common port;
Described liquid-crystal display section: the AD sampling functions of single-chip microcomputer and the programming of single-chip microcomputer realize, and LCD LCDs is selected in display section, and displaying contents has: 20ms voltage waveform and total failare number of times before fault phase, fault moment magnitude of voltage, fault moment.
2. the multi-functional CT open-circuit protecting device of a kind of high sensitivity according to claim 1, it is characterized in that: described failure reset part is: one group of power supply comprises VCC, GND, second group of power supply comprises VCC1, GNDA, VCC, GND are directly connected by common mode inductance with VCC1, two groups of power supplys of GNDA, VCC1 is connected with capacitance cathode, and GND is connected with electric capacity negative pole; Capacitance cathode is connected with bipod and interface of external reset of reset key through the 3rd resistance; The another bipod of reset key and another interface of external reset are connected with the positive pole of optocoupler input; The negative pole of electric capacity is connected with the negative pole of optocoupler input; Optocoupler output collector electrode connects the input port of single-chip microcomputer, meets power supply VCC through pull-up resistor simultaneously; Optocoupler output emitter connects GND end.
3. the multi-functional CT open-circuit protecting device of a kind of high sensitivity according to claim 1; it is characterized in that: described signal input signal amplifier circuit comprises amplifier; be connected to the resistance R 6 on amplifier negative pole; be connected to the resistance R 7 of amplifier negative pole and amplifier out; and be connected to the resistance R 8 on amplifier anode; the negative pole of described amplifier is connected with the resistance output of Order RC filter, and described resistance R 8 is connected with the electric capacity output of Order RC filter with the other end of amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420203900.1U CN203911464U (en) | 2014-04-24 | 2014-04-24 | High-sensitivity multifunctional CT circuit opening protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420203900.1U CN203911464U (en) | 2014-04-24 | 2014-04-24 | High-sensitivity multifunctional CT circuit opening protecting device |
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| Publication Number | Publication Date |
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| CN203911464U true CN203911464U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420203900.1U Withdrawn - After Issue CN203911464U (en) | 2014-04-24 | 2014-04-24 | High-sensitivity multifunctional CT circuit opening protecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956714A (en) * | 2014-04-24 | 2014-07-30 | 合肥沃华电气技术有限公司 | High-sensitivity multifunctional CT open circuit protection device |
-
2014
- 2014-04-24 CN CN201420203900.1U patent/CN203911464U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956714A (en) * | 2014-04-24 | 2014-07-30 | 合肥沃华电气技术有限公司 | High-sensitivity multifunctional CT open circuit protection device |
| CN103956714B (en) * | 2014-04-24 | 2016-09-07 | 合肥沃华电气技术有限公司 | A kind of high sensitivity multi-functional CT open-circuit protecting device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141029 Effective date of abandoning: 20160907 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |