CN206442105U - Current transformer monitoring and protecting system - Google Patents
Current transformer monitoring and protecting system Download PDFInfo
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- CN206442105U CN206442105U CN201621392907.8U CN201621392907U CN206442105U CN 206442105 U CN206442105 U CN 206442105U CN 201621392907 U CN201621392907 U CN 201621392907U CN 206442105 U CN206442105 U CN 206442105U
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- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 14
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Abstract
A kind of current transformer monitoring and protecting system that the utility model is provided, including for detecting the detection unit of Current Transformer Secondary side open-circuit condition, the protection indicating member for performing protection under open-circuit condition to Current Transformer Secondary side and control alarm unit；The output end of the detection unit is with controlling the input of alarm unit to be connected, and the control alarm unit control protection indicating member circuit closed is with disconnecting and performing open-circuit-protection, the protection indicating member and load RL formation parallel-connection structures；In view of this; the purpose of this utility model is to provide a kind of current transformer monitoring and protecting system; the open-circuit condition of Current Transformer Secondary side can accurately be detected; and the secondary side protection of current transformer is performed while detection; and the secondary side open circuit early warning of current transformer can be made in time; beneficial to accurately making counter-measure, it is ensured that the operation safety of power network.
Description
Technical field
The utility model is related to a kind of power protection system, more particularly to a kind of current transformer monitoring and protecting system.
Background technology
Current transformer is particularly important equipment in power network, middle current information, isolation electricity for gathering power system
Power equipment etc., therefore, the stable operation of current transformer are related to the operation safety of power network, however, current transformer is in operation
During easily occur open circuit phenomenon, and current transformer open circuit will cause serious accident of power supply, this is due to when electric current is mutual
After sensor open circuit, high pressure is induced in the secondary side of current transformer, it will to current transformer itself and secondary side apparatus
Cause badly damaged, so that the power supply safety of power system is threatened, but there is presently no effective method or equipment pair
The open-circuit condition of the secondary side of current transformer carries out accurately detection and open-circuit-protection.
It is, therefore, desirable to provide a kind of new Current Transformer Secondary side open-circuit-protection system, can accurately detect that electric current is mutual
The open-circuit condition of sensor secondary side, and the secondary side of execution current transformer is protected while detection, and can be timely
The secondary side open circuit early warning of current transformer is made, beneficial to accurately making counter-measure, it is ensured that the operation of power network is safe.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of current transformer monitoring and protecting system, can accurately examine
The open-circuit condition of Current Transformer Secondary side is surveyed, and the secondary side protection of current transformer is performed while detection, and
The secondary side open circuit early warning of current transformer can be made in time, beneficial to accurately making counter-measure, it is ensured that the operation of power network is pacified
Entirely.
A kind of current transformer monitoring and protecting system that the utility model is provided, including for detecting Current Transformer Secondary
The detection unit of side open-circuit condition, the protection indicating member for performing protection under open-circuit condition to Current Transformer Secondary side
And control alarm unit；
The output end of the detection unit is with controlling the input of alarm unit to be connected, and the control alarm unit control is protected
Finger shield shows element loop closure with disconnecting and performing open-circuit-protection, the protection indicating member and load RL formation parallel-connection structures.
Further, the detection unit include two-way transient diode TVS1, two-way transient diode TVS2, resistance R1,
Detect Current Transmit 1 and rectification circuit ZL；
One end of the two-way transient diode TVS1 and one end of the secondary coil of current transformer are connected, and the other end leads to
Resistance R1 is crossed with detecting that one end of primary winding of Current Transmit 1 be connected, the primary winding of detection current transformer it is another
One end is grounded, and the two ends of secondary coil and rectification circuit ZL positive input terminal and negative input end for detecting Current Transmit 1 connect
Connect, rectification circuit ZL output end is as the output end of detection unit, and two-way transient diode TVS2 two ends are connected to
Detect the two ends of the secondary coil of Current Transmit 1.
Further, the control alarm unit includes signal input module and control module and alarm module；
The input of the input module is connected with rectification circuit ZL output end, output end and the control mould of input module
The input connection of block, the control module control protection indicating member circuit closed is with disconnecting, the alarm module and control
Module is connected.
Further, the input module includes electric capacity C1, resistance R3, adjustable resistance R4, resistance R5, resistance R6 and amplifier
U1；
Electric capacity C1 one end is connected with rectification circuit ZL output end, other end ground connection, and electric capacity C1 and rectification circuit ZL are defeated
Go out the points of common connection at end by being grounded after resistance R3 and adjustable resistance R4 series connection, it is public between resistance R3 and adjustable resistance R4
Tie point is connected by resistance R5 with amplifier U1 in-phase end, and amplifier U1 end of oppisite phase is grounded by resistance R6, and amplifier U1's is defeated
Go out end as the output end of input module.
Further, the control module includes optocoupler G1, process circuit IC1, resistance R7, resistance R8, metal-oxide-semiconductor Q1, brilliant lock
Pipe SCR1 and relay J1；
The positive pole of the light emitting diode of the optocoupler G1 is connected with amplifier U1 output end, optocoupler G1 light emitting diode
Negative pole is grounded, and the colelctor electrode of optocoupler U1 phototriode meets power supply VCC, the hair of optocoupler U1 phototriode by resistance R7
Emitter-base bandgap grading is grounded by resistance R8, and the control pole of the colelctor electrode of optocoupler U1 phototriode also with IGCT SCR1 is connected, brilliant lock
Pipe SCR1 anode is connected with metal-oxide-semiconductor Q1 source electrode, and the drain electrode of metal-oxide-semiconductor meets power supply VCC, grid and the process circuit IC1 of metal-oxide-semiconductor
Control end connection, the coil that IGCT SCR1 negative electrode passes through relay J1 is grounded, process circuit IC1 input and amplifier
U1 output end connection.
Further, the alarm module is GPRS circuits, and the process circuit IC1 is led to by GPRS circuits and control centre
Letter connection.
Further, the protection indicating member includes resistance R2, relay J1 controlling switch J1-K1 and indicator lamp
It is commonly connected between the secondary coil of LED1, one end of the resistance R1 and two-way transient diode TVS1 summation current transformers
Point connection, the resistance R1 other end is connected by relay J1 controlling switch J1-K1 with indicator lamp LED1 positive pole, indicator lamp
LED1 negative pole polar region.
The beneficial effects of the utility model：By the utility model, opening for Current Transformer Secondary side can be accurately detected
Line state, and the secondary side of execution current transformer is protected while detection, and current transformer can be made in time
Secondary side open circuit early warning, beneficial to accurately making counter-measure, it is ensured that the operation of power network is safe.
Brief description of the drawings
The utility model is further described with reference to the accompanying drawings and examples：
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Fig. 1 is circuit theory diagrams of the present utility model, as illustrated, a kind of current transformer prison that the utility model is provided
Protection system is surveyed, including for detecting the detection unit of Current Transformer Secondary side open-circuit condition, for current transformer two
Secondary side performs the protection indicating member and control alarm unit of protection under open-circuit condition；
The output end of the detection unit is with controlling the input of alarm unit to be connected, and the control alarm unit control is protected
Finger shield shows element loop closure with disconnecting and performing open-circuit-protection, the protection indicating member and load RL formation parallel-connection structures,
By the utility model, the open-circuit condition of Current Transformer Secondary side can be accurately detected, and electricity is performed while detection
The secondary side protection of current transformer, and the secondary side open circuit early warning of current transformer can be made in time, beneficial to accurately making
Counter-measure, it is ensured that the operation safety of power network.
In the present embodiment, the detection unit includes two-way transient diode TVS1, two-way transient diode TVS2, resistance
R1, detection Current Transmit 1 and rectification circuit ZL；
One end of the two-way transient diode TVS1 and one end of the secondary coil of current transformer are connected, and the other end leads to
Resistance R1 is crossed with detecting that one end of primary winding of Current Transmit 1 be connected, the primary winding of detection current transformer it is another
One end is grounded, and the two ends of secondary coil and rectification circuit ZL positive input terminal and negative input end for detecting Current Transmit 1 connect
Connect, rectification circuit ZL output end is as the output end of detection unit, and two-way transient diode TVS2 two ends are connected to
The two ends of the secondary coil of Current Transmit 1 are detected, by this structure, when the secondary side of current transformer is opened a way
When, instant high-voltage and high current are induced in the secondary side of current transformer, two-way transient diode is breakdown, and passes through
The primary winding of resistance R1 and detection current transformer imports the earth, so that the secondary load equipment to current transformer has
The protection of effect, while detection current transformer exports induced signal and exported by rectification circuit, due to resistance R1 and inspection
The collective effect of current transformer primary winding is surveyed, the induced signal of the secondary side output of detection current transformer is not too large,
So as to be impacted to the subsequent conditioning circuit of detection current transformer, wherein, rectification circuit ZL is whole using full-bridge type diode
Current circuit.
In the present embodiment, the control alarm unit includes signal input module and control module and alarm module；
The input of the input module is connected with rectification circuit ZL output end, output end and the control mould of input module
The input connection of block, the control module control protection indicating member circuit closed is with disconnecting, the alarm module and control
Module is connected.
Input module described in the present embodiment include electric capacity C1, resistance R3, adjustable resistance R4, resistance R5, resistance R6 and
Amplifier U1；
Electric capacity C1 one end is connected with rectification circuit ZL output end, other end ground connection, and electric capacity C1 and rectification circuit ZL are defeated
Go out the points of common connection at end by being grounded after resistance R3 and adjustable resistance R4 series connection, it is public between resistance R3 and adjustable resistance R4
Tie point is connected by resistance R5 with amplifier U1 in-phase end, and amplifier U1 end of oppisite phase is grounded by resistance R6, and amplifier U1's is defeated
Go out end as the output end of input module；When normally being run by protective current transformer, due to detection current transformer no signal
Output, now amplifier U1 outputs low level after rectification circuit ZL output detection signals, passes through resistance R3's and adjustable resistance R4
Amplifier U1 in-phase end is input to after partial pressure, now, amplifier U1 output high level, the high level one side input processing circuit
In IC1, on the other hand, control optocoupler G1 conducting can be beneficial to the system stable operation, and amplifier U1 by said structure
Certain buffer action can also be played.
In the present embodiment, the control module include optocoupler G1, process circuit IC1, resistance R7, resistance R8, metal-oxide-semiconductor Q1,
IGCT SCR1 and relay J1；
The positive pole of the light emitting diode of the optocoupler G1 is connected with amplifier U1 output end, optocoupler G1 light emitting diode
Negative pole is grounded, and the colelctor electrode of optocoupler U1 phototriode meets power supply VCC, the hair of optocoupler U1 phototriode by resistance R7
Emitter-base bandgap grading is grounded by resistance R8, and the control pole of the colelctor electrode of optocoupler U1 phototriode also with IGCT SCR1 is connected, brilliant lock
Pipe SCR1 anode is connected with metal-oxide-semiconductor Q1 source electrode, and the drain electrode of metal-oxide-semiconductor meets power supply VCC, grid and the process circuit IC1 of metal-oxide-semiconductor
Control end connection, the coil that IGCT SCR1 negative electrode passes through relay J1 is grounded, process circuit IC1 input and amplifier
U1 output end connection, after amplifier U1 exports high level, IC1 control metal-oxide-semiconductor Q1 conductings, and optocoupler G1 conductings cause IGCT
SCR1 is turned on, and relay J1 obtains electric, now relay J1 open type controlling switch J1-K1 closures, so as to protect indicating member
Protection is performed, and guard mode instruction is carried out by indicator lamp LED1 and indicated by the open-circuit condition of protective current transformer；
When protecting indicating member to perform protection, due to the decline of voltage, two-way transient diode TVS1 returns to cut-off, detects electric current
Transformer CT1 is without output, amplifier U1 output low levels, now optocoupler G1 cut-offs, but still persistently output high level is IC1
Metal-oxide-semiconductor Q1 is turned on, and due to IGCT SCR1 trigger characteristic, relay J1 still works, and protection indicating member continuously carries out guarantor
Shield, after IC1 receives protection END instruction, metal-oxide-semiconductor Q1 cut-offs, relay J1 dead electricity, relay J1 controlling switch J1-K1
Normally open is returned to, wherein, process circuit IC1 uses existing process chip, such as the embedded chip of STM32 series.
In the present embodiment, the alarm module is GPRS circuits, and the process circuit IC1 passes through in GPRS circuits and control
The heart is communicated to connect, by this structure, beneficial to the timely feedback alarm information of process circuit IC1 in order to which conjunction is made by control centre
Reason, timely and effectively treatment measures, and beneficial to input control instruction into processing IC circuit 1, control metal-oxide-semiconductor Q1 disconnects.
In the present embodiment, the protection indicating member includes resistance R2, relay J1 controlling switch J1-K1 and instruction
Public company between the secondary coil of lamp LED1, one end of the resistance R1 and two-way transient diode TVS1 summation current transformers
Contact is connected, and the resistance R1 other end is connected by relay J1 controlling switch J1-K1 with indicator lamp LED1 positive pole, is indicated
Lamp LED1 negative pole polar region, can be to being formed well by this structure by the secondary side load equipment of protective current transformer
Protection.
Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to this
The technical scheme of utility model is modified or equivalent substitution, without departing from the objective and model of technical solutions of the utility model
Enclose, it all should cover among right of the present utility model.
Claims (7)
1. a kind of current transformer monitoring and protecting system, it is characterised in that：Including for detecting that Current Transformer Secondary side is opened a way
The detection unit of state, the protection indicating member for performing protection under open-circuit condition to Current Transformer Secondary side and control
Alarm unit processed；
The output end of the detection unit is with controlling the input of alarm unit to be connected, and the control alarm unit control protection refers to
Show element loop closure with disconnecting and performing open-circuit-protection, the protection indicating member and load RL formation parallel-connection structures.
2. current transformer monitoring and protecting system according to claim 1, it is characterised in that：The detection unit includes two-way
Transient diode TVS1, two-way transient diode TVS2, resistance R1, detection Current Transmit 1 and rectification circuit ZL；
One end of the two-way transient diode TVS1 and one end of the secondary coil of current transformer are connected, and the other end passes through electricity
One end of primary windings of the resistance R1 with detecting Current Transmit 1 is connected, and detects the other end of the primary winding of current transformer
Ground connection, the two ends of secondary coil of detection Current Transmit 1 are connected with rectification circuit ZL positive input terminal and negative input end, whole
Current circuit ZL output end is as the output end of detection unit, and two-way transient diode TVS2 two ends are connected to detection electricity
The two ends of current transformer CT1 secondary coil.
3. current transformer monitoring and protecting system according to claim 2, it is characterised in that：The control alarm unit includes
Signal input module and control module and alarm module；
The input of the input module is connected with rectification circuit ZL output end, the output end of input module and control module
Input is connected, and the control module control protection indicating member circuit closed is with disconnecting, the alarm module and control module
Connection.
4. current transformer monitoring and protecting system according to claim 3, it is characterised in that：The input module includes electric capacity
C1, resistance R3, adjustable resistance R4, resistance R5, resistance R6 and amplifier U1；
Electric capacity C1 one end is connected with rectification circuit ZL output end, other end ground connection, electric capacity C1 and rectification circuit ZL output ends
Points of common connection by resistance R3 and adjustable resistance R4 series connection after be grounded, it is commonly connected between resistance R3 and adjustable resistance R4
Point is connected by resistance R5 with amplifier U1 in-phase end, and amplifier U1 end of oppisite phase is grounded by resistance R6, amplifier U1 output end
It is used as the output end of input module.
5. current transformer monitoring and protecting system according to claim 4, it is characterised in that：The control module includes optocoupler
G1, process circuit IC1, resistance R7, resistance R8, metal-oxide-semiconductor Q1, IGCT SCR1 and relay J1；
The positive pole of the light emitting diode of the optocoupler G1 is connected with amplifier U1 output end, the negative pole of optocoupler G1 light emitting diode
Ground connection, the colelctor electrode of optocoupler U1 phototriode meets power supply VCC, the emitter stage of optocoupler U1 phototriode by resistance R7
It is grounded by resistance R8, the control pole of the colelctor electrode of optocoupler U1 phototriode also with IGCT SCR1 is connected, IGCT
SCR1 anode is connected with metal-oxide-semiconductor Q1 source electrode, and the drain electrode of metal-oxide-semiconductor meets power supply VCC, and the grid of metal-oxide-semiconductor is with process circuit IC1's
Control end is connected, and IGCT SCR1 negative electrode is grounded by relay J1 coil, process circuit IC1 input and amplifier U1
Output end connection.
6. current transformer monitoring and protecting system according to claim 5, it is characterised in that：The alarm module is GPRS electricity
Road, the process circuit IC1 is communicated to connect by GPRS circuits and control centre.
7. current transformer monitoring and protecting system according to claim 5, it is characterised in that：The protection indicating member includes
Resistance R2, relay J1 controlling switch J1-K1 and indicator lamp LED1, the resistance R1 one end and two-way transient diode
Points of common connection connection between the secondary coil of TVS1 summation current transformers, the control that the resistance R1 other end passes through relay J1
System switch J1-K1 is connected with indicator lamp LED1 positive pole, indicator lamp LED1 negative pole ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621392907.8U CN206442105U (en) | 2016-12-16 | 2016-12-16 | Current transformer monitoring and protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621392907.8U CN206442105U (en) | 2016-12-16 | 2016-12-16 | Current transformer monitoring and protecting system |
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| Publication Number | Publication Date |
|---|---|
| CN206442105U true CN206442105U (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621392907.8U Withdrawn - After Issue CN206442105U (en) | 2016-12-16 | 2016-12-16 | Current transformer monitoring and protecting system |
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| CN (1) | CN206442105U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786366A (en) * | 2016-12-16 | 2017-05-31 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN107302268A (en) * | 2017-08-31 | 2017-10-27 | 国家电网公司 | Switchgear house periphery running environment monitoring system |
| CN110299725A (en) * | 2019-06-19 | 2019-10-01 | 三峡大学 | A kind of thyristor high-speed switch and protection control circuit and its control method |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN114325543A (en) * | 2021-11-23 | 2022-04-12 | 国能朔黄铁路发展有限责任公司 | Current transformer abnormity monitoring device and control method |
-
2016
- 2016-12-16 CN CN201621392907.8U patent/CN206442105U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786366A (en) * | 2016-12-16 | 2017-05-31 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN106786366B (en) * | 2016-12-16 | 2019-04-30 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN107302268A (en) * | 2017-08-31 | 2017-10-27 | 国家电网公司 | Switchgear house periphery running environment monitoring system |
| CN110299725A (en) * | 2019-06-19 | 2019-10-01 | 三峡大学 | A kind of thyristor high-speed switch and protection control circuit and its control method |
| CN110299725B (en) * | 2019-06-19 | 2022-12-02 | 三峡大学 | Thyristor fast switch and protection control circuit and control method thereof |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN110988575B (en) * | 2019-12-30 | 2022-08-16 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN114325543A (en) * | 2021-11-23 | 2022-04-12 | 国能朔黄铁路发展有限责任公司 | Current transformer abnormity monitoring device and control method |
| CN114325543B (en) * | 2021-11-23 | 2024-03-22 | 国能朔黄铁路发展有限责任公司 | Current transformer abnormality monitoring device and control method |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170825 Effective date of abandoning: 20190430 |
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| AV01 | Patent right actively abandoned |