CN102064528A - Transformer neutral point earth protection device - Google Patents

Transformer neutral point earth protection device Download PDF

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Publication number
CN102064528A
CN102064528A CN2009103097313A CN200910309731A CN102064528A CN 102064528 A CN102064528 A CN 102064528A CN 2009103097313 A CN2009103097313 A CN 2009103097313A CN 200910309731 A CN200910309731 A CN 200910309731A CN 102064528 A CN102064528 A CN 102064528A
Authority
CN
China
Prior art keywords
neutral point
transformer neutral
discharging gap
earth
point earth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2009103097313A
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Chinese (zh)
Inventor
叶德平
杨筱安
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XI'AN SHENDIAN ELECTRICAL APPARATUS CO Ltd
Original Assignee
XI'AN SHENDIAN ELECTRICAL APPARATUS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XI'AN SHENDIAN ELECTRICAL APPARATUS CO Ltd filed Critical XI'AN SHENDIAN ELECTRICAL APPARATUS CO Ltd
Priority to CN2009103097313A priority Critical patent/CN102064528A/en
Publication of CN102064528A publication Critical patent/CN102064528A/en
Pending legal-status Critical Current

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Abstract

The invention provides an online detection transformer neutral point earth protection device. Various signals in the work of the transformer neutral point earth device can be monitored in real time; and various problems occurring during the operation of a system can be effectively processed in time according to the signals provided by a monitoring device so that the management personnel can conveniently judge the equipment operation conditions. The transformer neutral point earth device is guaranteed to operate in safe and reliable conditions. The monitor of the transformer neutral point earth device can still operate normally in humid climate and has strong adaptability to climate.

Description

A kind of transformer neutral point earth protective device
Technical field
The present invention relates to a kind of transformer neutral point earth protective device, be specifically related to a kind of transformer neutral point earth protective device that has monitoring function.
Background technology
In the three-phase circuit of Y-connection, its three coils (or winding) connect together a bit is called neutral point.The lead of being drawn by neutral point is called the neutral line.The neutral point of electric power system is meant that winding in the three-phase electrical power system or coil adopt the connection symmetric points and the balance of voltage point of each phase of power equipment (as generator, transformer etc.) of Y-connection, and its above earth potential is zero when electric power system normally moves or approaches zero.Electric power system neutral ground is a kind of working earthing, guarantees that power equipment and whole electric power system have suitable service conditions under normal and malfunction.
Ground protection and the protective earthing of zero connection protection general designation are in order to prevent the accident of human electric shock, to guarantee the important technique measure that the normal operation of electric equipment is taked.The difference of these two kinds of protections mainly shows three aspects: the one, and the protection philosophy difference.The basic principle of ground protection is a limit leakage equipment Leakage Current over the ground, makes it be no more than a certain safe range, just can cut off the electricity supply automatically in case surpass a certain setting value protector; The principle of zero connection protection is by the connecting to neutral circuit, when making equipment bump hull shape after insulation damages to become the Single Phase Metal short circuit, utilizes short circuit current to impel the protective device on the circuit to move rapidly.The 2nd, scope of application difference.The ground protection system has only the phase line and the neutral line, and the three-phase living load can not need the neutral line, as long as guaranteed the equipment good earth, the neutral line in the system must not have ground connection connection again except that power supply neutral ground; The zero connection protection system requirements is situation whatsoever, all must guarantee to protect the existence of the neutral line, the protection neutral line can also be separated with the zero connection protection line in case of necessity and set up, and the protection neutral line in the simultaneity factor must have the many places iterative earthing.
The transformer neutral point earth protective device; mainly be applicable to power transformer neutral ground loop; be used for realizing the operation of the direct ground connection of transformer neutral point and move by gap and arrester ground; the puncture of insulating between protection transformer over-voltage breakdown winding or iron core and winding; when preventing to break down in system, the transformer neutral point voltage that causes raises and causes the damage of transformer.
There is following problem in existing in the market transformer neutral point earth protective device: leakage current that can't monitoring grounding switch insulation pillar; Can't monitor the leakage current and the action frequency thereof of lightning arrester; Can't write down the action frequency of discharging gap; Temperature that can't the monitoring grounding switch contact.Above-mentioned signal can't be monitored when making the neutral ground protective device damage, or can not be found when aging, very likely causes transformer to burn, and influences the stable operation of whole electric power system.
Summary of the invention
The invention provides a kind of transformer neutral point earth protective device that has monitoring function, can't monitor the problem that various working signals influence whole power system stability operation to solve existing transformer neutral point earth protective device.
Design of the present invention is as follows:
This online detection transformer neutral point earth protective device comprises discharging gap 1, the earthed switch 2 in parallel with discharging gap 1, the lightning arrester 3 in parallel with discharging gap 1; One end node of described discharging gap 1, earthed switch 2, lightning arrester 3 parallel connections is for connecing transformer neutral point 4, other end node is an earth point 5, it is characterized in that: be in series with current transformer 7 between discharging gap 1 and the earth point 5, also be in series with discharge counter 6 between described discharging gap 1 and the earth point 5, on the described earthed switch 2 switch contact temperature monitor 21 be installed; Be in series with the second on-line monitoring device 9 between the insulation column of described earthed switch 2 and the earth point 5.
The invention has the advantages that:
Can monitor various types of signal in the work of transformer neutral point earthing device in real time,, make things convenient for administrative staff's judgment device operation conditions according to signal that monitoring device the provides all kinds of problems of treatment system emerged in operation timely and effectively.Guarantee that the transformer neutral point earthing device moves under safe and reliable situation.The monitor of transformer neutral point earthing device still can normally move under humid climate, and is very strong to the adaptability of weather.
Description of drawings
Fig. 1 is principle of the invention figure.
1: discharging gap; 2: earthed switch; 3: lightning arrester; 4: transformer neutral point; 5: earth point; 6: discharge counter; 7: current transformer; 8: the first on-line monitoring devices; 9: the second on-line monitoring devices; 21: the switch contact temperature monitor.
Embodiment
The specific embodiment of the invention is as shown in Figure 1:
This transformer neutral point earth protective device comprises discharging gap 1, the earthed switch 2 in parallel with discharging gap 1, the lightning arrester 3 in parallel with discharging gap 1, and earthed switch 2 is in parallel with lightning arrester 3; One end node of discharging gap 1, earthed switch 2, lightning arrester 3 parallel connections is for connecing transformer neutral point 4, and the other end of node is an earth point 5; Be in series with discharge counter 6 summation current transformers 7 between discharging gap 1 and the earth point 5; Be in series with the first on-line monitoring device 8 between lightning arrester 3 and the earth point 5; Switch contact temperature monitor 21 is installed on the earthed switch 2; Be in series with the second on-line monitoring device 9 between the insulation column of earthed switch 2 and the earth point 5.
During work, discharge counter 6 monitoring discharging gap actions; Current transformer 7 provides the signal of discharging gap action subsequent current; The first on-line monitoring device, 8 monitoring leakage current of an arrester and action frequencies thereof; The temperature of switch contact temperature monitor 21 monitoring switch contacts; The second on-line monitoring device, 9 monitoring grounding switch insulation pillar leakage currents.Monitoring grounding switch insulation pillar leakage current, thus can in time find to avoid during the pillar insulation damages accident to take place; The aging lightning arrester that will damage just can in time be found and change to monitoring leakage current of an arrester and action frequency thereof according to the variation and the action frequency of leakage current,, in time eliminate accident potential; The size of monitoring discharging gap action frequency and continuous electric current just can in time be analyzed and administer the running status of system; Whether reliably the temperature of monitoring grounding switch contact judges switch closure or disconnection.
Same distribution system can only adopt with a kind of protected mode, and two kinds of protected modes must not be used with.Next is that the client must understand what cries protective earthing, and right area divides the difference of ground connection and zero connection protection.Protective earthing is meant household electrical appliance, power equipment etc. because the damage of insulation may make that its metal shell is charged, and the ground connection that is provided with in order to prevent this voltage from jeopardizing personal safety is called protective earthing.
The whole system operation situation can be in time understood in the monitoring of various types of signal, and all kinds of problems of treatment system emerged in operation make things convenient for administrative staff's judgment device operation conditions effectively.

Claims (1)

1. an online detection transformer neutral point earth protective device comprises discharging gap (1), the earthed switch (2) in parallel with discharging gap (1), the lightning arrester (3) in parallel with discharging gap (1); One end node of described discharging gap (1), earthed switch (2), lightning arrester (3) parallel connection is for connecing transformer neutral point (4), other end node is earth point (5), it is characterized in that: be in series with current transformer (7) between discharging gap (1) and the earth point (5), also be in series with discharge counter (6) between described discharging gap (1) and the earth point (5), switch contact temperature monitor (21) is installed on the described earthed switch (2); Be in series with the second on-line monitoring device (9) between the insulation column of described earthed switch (2) and the earth point (5).
CN2009103097313A 2009-11-13 2009-11-13 Transformer neutral point earth protection device Pending CN102064528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009103097313A CN102064528A (en) 2009-11-13 2009-11-13 Transformer neutral point earth protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009103097313A CN102064528A (en) 2009-11-13 2009-11-13 Transformer neutral point earth protection device

Publications (1)

Publication Number Publication Date
CN102064528A true CN102064528A (en) 2011-05-18

Family

ID=43999693

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009103097313A Pending CN102064528A (en) 2009-11-13 2009-11-13 Transformer neutral point earth protection device

Country Status (1)

Country Link
CN (1) CN102064528A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102288868A (en) * 2011-08-12 2011-12-21 安徽省电力公司淮南供电公司 One-point grounding detector and detection method for voltage transformer secondary coil neutral line
CN102842900A (en) * 2012-08-17 2012-12-26 河北省首钢迁安钢铁有限责任公司 Power supply circuit of crane
CN104167723A (en) * 2014-08-06 2014-11-26 齐进 Main transformer neutral point overvoltage protection device
CN105048437A (en) * 2015-09-03 2015-11-11 芜湖科越电气有限公司 Combined neutral point grounding integrated control device
CN105140903A (en) * 2015-09-21 2015-12-09 中电新源智能电网科技有限公司 Transformer neutral point gas insulated substation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102288868A (en) * 2011-08-12 2011-12-21 安徽省电力公司淮南供电公司 One-point grounding detector and detection method for voltage transformer secondary coil neutral line
CN102842900A (en) * 2012-08-17 2012-12-26 河北省首钢迁安钢铁有限责任公司 Power supply circuit of crane
CN104167723A (en) * 2014-08-06 2014-11-26 齐进 Main transformer neutral point overvoltage protection device
CN105048437A (en) * 2015-09-03 2015-11-11 芜湖科越电气有限公司 Combined neutral point grounding integrated control device
CN105048437B (en) * 2015-09-03 2018-08-24 芜湖科越电气有限公司 A kind of combined type neutral ground composite control apparatus
CN105140903A (en) * 2015-09-21 2015-12-09 中电新源智能电网科技有限公司 Transformer neutral point gas insulated substation

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Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20110518

C02 Deemed withdrawal of patent application after publication (patent law 2001)