CN106483349B - A kind of mutual inductor secondary side earthing detection protection system - Google Patents
A kind of mutual inductor secondary side earthing detection protection system Download PDFInfo
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- CN106483349B CN106483349B CN201611038184.6A CN201611038184A CN106483349B CN 106483349 B CN106483349 B CN 106483349B CN 201611038184 A CN201611038184 A CN 201611038184A CN 106483349 B CN106483349 B CN 106483349B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
A kind of mutual inductor secondary side earthing detection protection system is claimed in the present invention, comprising: constant-current source, for exporting stable DC and loading on the secondary coil of mutual inductor；Earthing detection unit, for detecting whether mutual inductor secondary side ground terminal good earth and exports detection signal；Execution unit is protected, input terminal is connect with the output end of earthing detection unit, is grounded for receiving the detection signal of earthing detection unit output and executing mutual inductor secondary side under mutual inductor secondary side ground fault condition；On the one hand can the ground connection situation to mutual inductor secondary side accurately detected; on the other hand; the secondary side of mutual inductor can be subjected to good earth after ground fault occurs in mutual inductor secondary side; it is grounded protection, to effectively avoid carrying out good protection and load equipment malfunction to the load equipment of mutual inductor secondary side.
Description
Technical field
The present invention relates to power grid detection devices more particularly to a kind of mutual inductor secondary side earthing detection to protect system.
Background technique
Mutual inductor includes voltage transformer and current transformer, and mutual inductor is equipment particularly important in power grid, for surveying
Amount or protection system, principle is that the high voltage of primary side or high current are converted into standard low pressure using electromagnetic induction principle
Or standard small electric current, to realize standardization, the miniaturization of measuring instrumentss, protection equipment and automatic control equipment.
The necessary reliable ground of the secondary side of mutual inductor, for preventing the high pressure of primary side of mutual inductor from hitting in mutual inductor insulation
The equipment malfunction of secondary side caused by secondary side is scurried into after wearing and good protection is realized to secondary side apparatus, still,
With the passage for using the time, the ground connection of mutual inductor secondary side will appear failure, imperfect earth occurs or ground connection disconnects, this is
It is breakneck, mutual inductor secondary side ground connection is accurately detected there is presently no a kind of effective means and carries out ground connection guarantor
Shield.
It is, therefore, desirable to provide a kind of pair of mutual inductor secondary side is grounded the system for being detected and being executed protection, on the one hand
Can the ground connection situation to mutual inductor secondary side accurately detected, on the other hand, when ground fault occurs in mutual inductor secondary side
The secondary side of mutual inductor can be subjected to good earth afterwards, protection is grounded, to effectively avoid to mutual inductor secondary side
Load equipment carries out good protection and load equipment malfunction.
Summary of the invention
Present invention seek to address that the above problem of the prior art.Propose it is a kind of being capable of ground connection shape to mutual inductor secondary side
Condition is accurately detected, effectively carries out good protection to the load equipment of mutual inductor secondary side and avoid load equipment malfunction
Mutual inductor secondary side earthing detection protect system.
Technical scheme is as follows:
A kind of mutual inductor secondary side earthing detection protection system, including mutual inductor constant-current supply, the mutual inductor Constant Electric Current
Source is used to export stable DC and loads on the secondary coil both ends of mutual inductor, further include:
Earthing detection unit is set to mutual inductor secondary side ground terminal, for whether detecting mutual inductor secondary side ground terminal
Good earth simultaneously exports detection signal；
Execution unit is protected, protects the input terminal of execution unit and the output end of earthing detection unit to connect, for receiving
The detection signal of earthing detection unit output simultaneously executes mutual inductor secondary side ground connection under mutual inductor secondary side ground fault condition.
Further, the earthing detection unit includes resistance R1, capacitor C1, optocoupler U1 and resistance R2；The resistance
One end of R1 is connect with the ground terminal of mutual inductor secondary side, the other end ground connection of R1, one end of the capacitor C1 and mutual inductor two
The ground terminal of secondary side connects, and the other end ground connection of capacitor C1, the anode of the light emitting diode of the optocoupler U1 is connected to capacitor C1
It is grounded with the cathode of the points of common connection of the ground terminal of mutual inductor secondary side, the light emitting diode of optocoupler U1, the optocoupler U1's
The collector of phototriode meets power supply VCC, and the emitter of the phototriode of optocoupler U1 is grounded by resistance R2, optocoupler U1's
Output end of the points of common connection as earthing detection unit between the emitter and resistance R2 of phototriode.
Further, the earthing detection unit further includes TVS diode, and the forward end of the TVS diode is connected to
The points of common connection of the ground terminal of resistance R1 and mutual inductor secondary side, the backward end ground connection of TVS diode.
Further, the earthing detection unit of stating further includes indicator light LED1, the anode connection of the indicator light LED1
In power supply VCC, the cathode of indicator light LED1 is connected to the collector of the phototriode of optocoupler U1.
Further, the protection execution unit includes relay J1, DC power supply, resistance R6, indicator light LED2, electronics
Switching device and the driving circuit of control electronic switching device movement；
The stationary contact K1 of the relay J1 is connected to the ground terminal of mutual inductor secondary side, and the stationary contact K2 of relay J1 connects
The anode on ground, DC power supply is connect by electronic switching device with one end of resistance R6, the other end and indicator light of resistance R6
The anode connection of LED2, the cathode of indicator light LED2 are connect with one end of the magnet exciting coil of relay J1, the cathode of DC power supply
It is connect with the other end of the magnet exciting coil of relay J1, the output end of the driving circuit and the input terminal of electronic switching device connect
It connects, the input terminal of the driving circuit is connect as the input terminal of protection execution unit with the output end of earthing detection unit；Its
In, relay J1 is closed type relay.
Further, the electronic switching device is metal-oxide-semiconductor Q1, the drain electrode of the metal-oxide-semiconductor Q1 and the anode of DC power supply
Connection, the source electrode of metal-oxide-semiconductor Q1 are connect with the magnet exciting coil of relay J1, and the grid of metal-oxide-semiconductor Q1 and the output end of driving circuit connect
It connects.
Further, the driving circuit includes controllable silicon SCR 1, resistance R3, resistance R4, operational amplifier UA, capacitor C2
And diode D1；The anode of the controllable silicon SCR 1 is connect by resistance R3 with power supply VCC, and the cathode of controllable silicon SCR 1 connects
Ground, the control electrode of controllable silicon SCR 1 is connected to the output end of earthing detection unit as the input terminal of driving circuit, silicon-controlled
The points of common connection of SCR1 and resistance R3 are grounded by resistance R4, and points of common connection and the operation of controllable silicon SCR 1 and resistance R3 are put
The positive terminal connection of big device UA, the reverse side ground connection of operational amplifier UA, the output end of operational amplifier UA is with diode D1's
The cathode of anode connection, diode D1 is connected as the output end of driving circuit and the input terminal of electronic switching device, the fortune
The output end for calculating amplifier UA is grounded by capacitor C2.
Further, the driving circuit further includes reset circuit, and the reset circuit includes manual switch S1, resistance
R7, resistance R5, capacitor C3 and triode Q2；One end of the manual switch S1 is commonly connected with power supply VCC's and resistance R3
Point connection, the other end are grounded by resistance R5, the points of common connection and operational amplifier UA of the resistance R5 and manual switch S1
Positive terminal connection, the collector of the triode Q2 is connected to the points of common connection of power supply VCC and resistance R3, triode Q2's
Emitter ground connection, one end of resistance R7 are connected to the points of common connection of manual switch S1 and resistance R5, and the other end of resistance R7 is logical
Capacitor C3 ground connection is crossed, the base stage of triode Q2 is connected to the points of common connection between resistance R7 and capacitor C3.
Further, the manual switch S1 is delay manual switch, using button delay switch or touching delay-action switch.
Further, the mutual inductor includes voltage transformer and current transformer.
It advantages of the present invention and has the beneficial effect that:
Mutual inductor secondary side earthing detection of the present invention protects system, on the one hand being capable of ground connection situation to mutual inductor secondary side
It is accurately detected, on the other hand, the secondary side of mutual inductor can be carried out after ground fault occurs in mutual inductor secondary side good
Good ground connection, is grounded protection, to effectively avoid carrying out the load equipment of mutual inductor secondary side good protection and bear
Carry equipment malfunction, it is ensured that power network safety operation.
Detailed description of the invention
Fig. 1 is that the present invention provides the circuit diagram of preferred embodiment mutual inductor secondary side earthing detection protection system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, detailed
Carefully describe.Described embodiment is only a part of the embodiments of the present invention.
Constant-current source, for exporting stable DC and loading on the secondary coil of mutual inductor；
Earthing detection unit, for detecting whether mutual inductor secondary side ground terminal good earth and exports detection signal；
Execution unit is protected, input terminal is connect with the output end of earthing detection unit, for receiving earthing detection unit
The detection signal of output simultaneously executes mutual inductor secondary side ground connection under mutual inductor secondary side ground fault condition, wherein constant-current source
For existing DC current source, to the secondary side load test DC current of mutual inductor, due to the effect of mutual inductor secondary coil,
That is the coil of mutual inductor is equivalent to inductance, and inductance has biggish induction reactance for alternating current, and minimum for the induction reactance of direct current,
Therefore, the test electric current that constant-current source is loaded can smoothly pass over the second siding ring of mutual inductor without to secondary lateral load
RL has any impact, by above structure, on the one hand can the ground connection situation to mutual inductor secondary side accurately detected, separately
On the one hand, the secondary side of mutual inductor can be subjected to good earth after ground fault occurs in mutual inductor secondary side, be grounded
Protection, to effectively avoid carrying out good protection and load equipment malfunction to the load equipment of mutual inductor secondary side, it is ensured that
Power network safety operation, wherein constant-current source uses existing controllable constant-current source, and according to control instruction according to the week of setting
Phase carries out electric current load, will not be repeated here at this to its structure and principle.
In the present embodiment, the earthing detection unit includes resistance R1, capacitor C1, optocoupler U1 and resistance R2；
One end of the resistance R1 is connect with the ground terminal of mutual inductor secondary side, other end ground connection, and the one of the capacitor C1
End is connect with the ground terminal of mutual inductor secondary side, and other end ground connection, the anode of the light emitting diode of the optocoupler U1 is connected to electricity
Hold the points of common connection of the ground terminal of C1 and mutual inductor secondary side, the cathode ground connection of the light emitting diode of optocoupler U1, the optocoupler
The collector of the phototriode of U1 meets power supply VCC, and the emitter of the phototriode of optocoupler U1 is grounded by resistance R2, optocoupler
Output end of the points of common connection as earthing detection unit between the emitter and resistance R2 of the phototriode of U1, this
In structure, the practical ground line of resistance R1 and capacitor C1 and mutual inductor secondary side is parallel-connection structure, if mutual inductor secondary side
Ground connection is good, then the test electric current that constant-current source is loaded will directly be imported into ground terminal, capacitor C1 and resistance R1 are without electric current
It flows through, when the direct current of the ground terminal imperfect earth of mutual inductor secondary side, constant-current source load will charge to capacitor C1, with capacitor
The voltage of C1 increases, optocoupler U1 conducting, thus can be right by above structure by the emitter output detection signal of optocoupler U1
The ground connection situation of mutual inductor secondary side is accurately detected, conducive to the work of subsequent protection execution unit.
Wherein, the earthing detection unit further includes TVS diode, and the forward end of the TVS diode is connected to resistance
The points of common connection of the ground terminal of R1 and mutual inductor secondary side, the backward end ground connection of TVS diode, can by this structure
Good protection is realized to ground connection detection unit and subsequent conditioning circuit, thus primary when ground fault occurs for mutual inductor secondary side
The high current of side is scurried into and damages ground protection unit and protection execution unit.
Wherein, the earthing detection unit further includes indicator light LED1, and the anode of the indicator light LED1 is connected to power supply
VCC, the cathode of indicator light LED1 are connected to the collector of the phototriode of optocoupler U1, by this structure, when optocoupler U1 is led
After logical, indicator light LED1 is lighted, and showing current mutual inductor secondary side, there are ground faults, and prompt staff is facilitated to examine
It repairs.
In the present embodiment, the protection execution unit includes relay J1, DC power supply, resistance R6, indicator light LED2, electricity
Sub switch device and the driving circuit of control electronic switching device movement；
The stationary contact K1 of the relay J1 is connected to the ground terminal of mutual inductor secondary side, and the stationary contact K2 of relay J1 connects
The anode on ground, DC power supply is connect by electronic switching device with one end of resistance R6, the other end and indicator light of resistance R6
The anode connection of LED2, the cathode of indicator light LED2 are connect with one end of the magnet exciting coil of relay J1, the cathode of DC power supply
It is connect with the other end of the magnet exciting coil of relay J1, the output end of the driving circuit and the input terminal of electronic switching device connect
It connects, the input terminal of the driving circuit is connect as the input terminal of protection execution unit with the output end of earthing detection unit；Its
In, relay J1 is closed type relay, and DC power supply uses existing power supply, such as straight by providing after AC rectification
Galvanic electricity, or provided by battery etc..
Wherein, the electronic switching device is metal-oxide-semiconductor Q1, and the drain electrode of the metal-oxide-semiconductor Q1 and the anode of DC power supply connect,
The source electrode of metal-oxide-semiconductor Q1 is connect with the magnet exciting coil of relay J1, and the grid of metal-oxide-semiconductor Q1 and the output end of driving circuit connect.
The driving circuit includes controllable silicon SCR 1, resistance R3, resistance R4, amplifier UA, capacitor C2 and diode D1；
The anode of the controllable silicon SCR 1 is connect by resistance R3 with power supply VCC, the minus earth of controllable silicon SCR 1, controllably
The control electrode of silicon SCR1 is connected to the output end of earthing detection unit, controllable silicon SCR 1 and resistance as the input terminal of driving circuit
The points of common connection of R3 is grounded by resistance R4, and the points of common connection of controllable silicon SCR 1 and resistance R3 and the positive terminal of amplifier UA connect
It connects, the reverse side ground connection of amplifier UA, the output end of amplifier UA is connect with the anode of diode D1, and the cathode of diode D1 is as drive
The output end of dynamic circuit and the input terminal of electronic switching device connect, and the output end of the amplifier UA is grounded by capacitor C2；?
In the state that mutual inductor secondary side ground connection is normal, the positive terminal of amplifier U1 is high level, and reverse side is low level, amplifier U1 output
Low level, metal-oxide-semiconductor Q1 ends at this time, when earthing detection unit detects the ground connection failure of mutual inductor secondary side, i.e. mutual inductance
The ground terminal of device secondary side is unreliable or is fully disconnected, at this time optocoupler U1 be connected, the control electrode of controllable silicon SCR 1 obtain it is electric, can
Silicon SCR1 conducting is controlled, the electric screen of the positive terminal of amplifier UA is pulled low at this time, and the positive terminal and reverse side of amplifier UA is low level
Input, amplifier UA export high level, and metal-oxide-semiconductor Q1 conducting, indicator light LED2, which shines, carries out indicating fault, and relay J1 is obtained
Electricity, the movable contact and stationary contact K1, K2 of relay J1 are attracted, and the ground terminal of mutual inductor secondary side is grounded again, thus to mutual
The secondary side apparatus of sensor and mutual inductor forms good protection, and since relay J1 is attracted, test electric current is no longer flow towards electricity
Hold C1, and the remaining capacity of capacitor C1, by the contact electric discharge after relay J1 actuation, optocoupler U1 ends, and LED1 extinguishes, though
There is no trigger currents for the control electrode of right controllable silicon SCR 1, but due to the trigger characteristic of controllable silicon SCR 1,1 sun of controllable silicon SCR
It is still connected between pole and cathode, the positive terminal of amplifier UA keeps low level state.
In the present embodiment, the driving circuit further includes reset circuit, and the reset circuit includes manual switch S1, resistance
R7, resistance R5, capacitor C3 and triode Q2；
One end of the manual switch S1 is connect with the points of common connection of power supply VCC and resistance R3, and the other end passes through resistance
The points of common connection of R5 ground connection, the resistance R5 and manual switch S1 are connect with the positive terminal of amplifier UA, the triode Q2's
Collector is connected to the points of common connection of power supply VCC and resistance R3, the emitter ground connection of triode Q2, one end connection of resistance R7
It is grounded in the other end of the points of common connection of manual switch S1 and resistance R5, resistance R7 by capacitor C3, the base stage of triode Q2
The points of common connection being connected between resistance R7 and capacitor C3；When ground fault of the staff to mutual inductor secondary side completes inspection
After repairing, staff is closed manual switch, generates pressure drop on resistance R5 at this time, and the positive terminal of amplifier UA re-enters high electricity
Flat, amplifier UA exports low level, metal-oxide-semiconductor Q1 cut-off, and relay J1 power loss disconnects；At this point, capacitor C3 is electrically charged, as capacitor C3
Voltage reach the conducting voltage of triode Q2 after, triode Q2 conducting, the of short duration power-off of the positive terminal of amplifier UA, silicon-controlled at this time
SCR1 is since power loss is ended, after the voltage of the cut-off of controllable silicon SCR 1 and capacitor C3 declines, and triode Q2 is caused to end, amplifier
The positive terminal of UA restores high level state；By the effect of reset circuit, relay J1 can be made to continue to remain open waiting and hold
Capable protection act next time；Wherein, manual switch S1 is delay manual switch, such as button delay switch, touching delay-action switch
Deng.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.?
After the content for having read record of the invention, technical staff can be made various changes or modifications the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (9)
1. a kind of mutual inductor secondary side earthing detection protects system, including mutual inductor constant-current supply, the mutual inductor constant-current supply
For exporting stable DC and loading on the secondary coil both ends of mutual inductor, it is characterised in that further include:
Whether earthing detection unit is set to mutual inductor secondary side ground terminal, good for detecting mutual inductor secondary side ground terminal
It is grounded and exports detection signal；
Execution unit is protected, the input terminal of execution unit and the output end of earthing detection unit is protected to connect, for receiving ground connection
The detection signal of detection unit output simultaneously executes mutual inductor secondary side ground connection under mutual inductor secondary side ground fault condition；It is described
Earthing detection unit includes resistance R1, capacitor C1, optocoupler U1 and resistance R2；One end of the resistance R1 and mutual inductor secondary side
Ground terminal connection, the other end ground connection of R1, one end of the capacitor C1 connect with the ground terminal of mutual inductor secondary side, capacitor C1
Other end ground connection, the anode of the light emitting diode of the optocoupler U1 is connected to the ground terminal of capacitor C1 and mutual inductor secondary side
Points of common connection, the cathode ground connection of the light emitting diode of optocoupler U1, the collector of the phototriode of the optocoupler U1 connect power supply
The emitter of VCC, the phototriode of optocoupler U1 are grounded by resistance R2, the emitter and resistance of the phototriode of optocoupler U1
Output end of the points of common connection as earthing detection unit between R2.
2. mutual inductor secondary side earthing detection according to claim 1 protects system, which is characterized in that the earthing detection
Unit further includes TVS diode, and the forward end of the TVS diode is connected to the ground terminal of resistance R1 and mutual inductor secondary side
Points of common connection, the backward end ground connection of TVS diode.
3. mutual inductor secondary side earthing detection according to claim 1 or 2 protects system, which is characterized in that the ground connection
Detection unit further includes indicator light LED1, and the anode of the indicator light LED1 is connected to power supply VCC, and the cathode of indicator light LED1 connects
It is connected to the collector of the phototriode of optocoupler U1.
4. mutual inductor secondary side earthing detection according to claim 1 or 2 protects system, which is characterized in that the protection
Execution unit includes relay J1, DC power supply, resistance R6, indicator light LED2, electronic switching device and control electronic switch
The driving circuit of device activity；
The stationary contact K1 of the relay J1 is connected to the ground terminal of mutual inductor secondary side, and the stationary contact K2 of relay J1 is grounded,
The anode of DC power supply is connect by electronic switching device with one end of resistance R6, and the other end of resistance R6 is with indicator light LED2's
Anode connection, the cathode of indicator light LED2 are connect with one end of the magnet exciting coil of relay J1, the cathode and relay of DC power supply
The other end of the magnet exciting coil of device J1 connects, and the output end of the driving circuit and the input terminal of electronic switching device connect, institute
The input terminal for stating driving circuit is connect as the input terminal of protection execution unit with the output end of earthing detection unit；Wherein, after
Electric appliance J1 is closed type relay.
5. mutual inductor secondary side earthing detection according to claim 4 protects system, which is characterized in that the electronic switch
Device is metal-oxide-semiconductor Q1, and the drain electrode of the metal-oxide-semiconductor Q1 and the anode of DC power supply connect, and the source electrode of metal-oxide-semiconductor Q1 is with relay J1's
Magnet exciting coil connection, the grid of metal-oxide-semiconductor Q1 and the output end of driving circuit connect.
6. mutual inductor secondary side earthing detection according to claim 4 protects system, which is characterized in that the driving circuit
Including controllable silicon SCR 1, resistance R3, resistance R4, operational amplifier UA, capacitor C2 and diode D1；The controllable silicon SCR 1
Anode is connect by resistance R3 with power supply VCC, the minus earth of controllable silicon SCR 1, and the control electrode of controllable silicon SCR 1 is as driving electricity
The input terminal on road is connected to the output end of earthing detection unit, and the points of common connection of controllable silicon SCR 1 and resistance R3 pass through resistance R4
The points of common connection of ground connection, controllable silicon SCR 1 and resistance R3 are connect with the positive terminal of operational amplifier UA, operational amplifier UA's
Reverse side ground connection, the output end of operational amplifier UA are connect with the anode of diode D1, and the cathode of diode D1 is as driving electricity
The output end on road and the input terminal of electronic switching device connect, and the output end of the operational amplifier UA is grounded by capacitor C2.
7. mutual inductor secondary side earthing detection according to claim 6 protects system, which is characterized in that
The driving circuit further includes reset circuit, and the reset circuit includes manual switch S1, resistance R7, resistance R5, capacitor
C3 and triode Q2；One end of the manual switch S1 is connect with the points of common connection of power supply VCC and resistance R3, and the other end is logical
It crosses resistance R5 to be grounded, the points of common connection of the resistance R5 and manual switch S1 are connect with the positive terminal of operational amplifier UA, institute
The collector for stating triode Q2 is connected to the points of common connection of power supply VCC and resistance R3, the emitter ground connection of triode Q2, resistance
One end of R7 is connected to the points of common connection of manual switch S1 and resistance R5, and the other end of resistance R7 is grounded by capacitor C3, and three
The base stage of pole pipe Q2 is connected to the points of common connection between resistance R7 and capacitor C3.
8. mutual inductor secondary side earthing detection according to claim 7 protects system, which is characterized in that the manual switch
S1 is delay manual switch, using button delay switch or touching delay-action switch.
9. mutual inductor secondary side earthing detection according to claim 1 protects system, which is characterized in that
The mutual inductor includes voltage transformer and current transformer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702368A (en) * | 2009-11-26 | 2010-05-05 | 平高集团有限公司 | High voltage dry-type current transformer and ground protection method thereof |
| CN101762773A (en) * | 2010-01-19 | 2010-06-30 | 山东科汇电力自动化有限公司 | Detection method and detection device for ground protection of high-voltage equipment |
| CN103001194A (en) * | 2012-12-20 | 2013-03-27 | 诸暨市供电局 | On-line line fault monitoring and protection device and protection method thereof |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4118259B2 (en) * | 2004-06-28 | 2008-07-16 | 愛知電機株式会社 | DC ground fault detector |
-
2016
- 2016-11-23 CN CN201611038184.6A patent/CN106483349B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702368A (en) * | 2009-11-26 | 2010-05-05 | 平高集团有限公司 | High voltage dry-type current transformer and ground protection method thereof |
| CN101762773A (en) * | 2010-01-19 | 2010-06-30 | 山东科汇电力自动化有限公司 | Detection method and detection device for ground protection of high-voltage equipment |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
| CN103001194A (en) * | 2012-12-20 | 2013-03-27 | 诸暨市供电局 | On-line line fault monitoring and protection device and protection method thereof |
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