CN203674563U - TN dual power system transformer ground current detection device - Google Patents
TN dual power system transformer ground current detection device Download PDFInfo
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- CN203674563U CN203674563U CN201320860232.5U CN201320860232U CN203674563U CN 203674563 U CN203674563 U CN 203674563U CN 201320860232 U CN201320860232 U CN 201320860232U CN 203674563 U CN203674563 U CN 203674563U
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Abstract
The utility model discloses a TN dual power system transformer ground current detection device. The TN dual power system transformer ground current detection device comprises an electrical interlocking circuit, ground modules and ground current transformers 1TA and 2TA, wherein the ground current transformers 1TA and 2TA and the electrical interlocking circuit are arranged in a busbar cabinet, the ground modules are respectively arranged in a first power incoming cabinet, a second power incoming cabinet and the busbar cabinet, the ground current transformers 1TA and 2TA are respectively connected with ground modules of the first power incoming cabinet, the second power incoming cabinet and the busbar cabinet through the electrical interlocking circuit, and the ground modules of the first power incoming cabinet, the second power incoming cabinet and the busbar cabinet can control motions of the corresponding breakers according to the current detection result. The TN dual power system transformer ground current detection device solves a problem of transformer ground current detection in a new ground mode.
Description
Technical field
The utility model belongs to technical field of electricity, is specifically related to a kind of TN double power-supply system transformer grounding current sensing means.
Background technology
No matter industry or civilian 10/0.4kV electric substation, the overwhelming majority is provided with two or two above transformers, and generally adopts TN grounding system.
Traditional detection transformer grounding current device is according to stipulating in electrical code in the past, i.e. directly ground connection of distribution transformer neutral point, and protection conductor or protective earthing neutral conductor should be close distribution transformer place ground connection, and should enter building place ground connection.The adverse consequences that sort circuit design produces is:
(1) N line and PE line parallel, PE conductor has large electric current to be passed through, and has improved the above earth potential of PE conductor, jeopardize personal safety, in fact grounding system becomes TN-C form, and N line and PE line have in fact all become protective earthing-neutral conductor, causes TN-S grounding system to exist in name only.
(2) form stray electrical current, it may cause electrical fire, descend metallic conduit or reinforcement foundation, interfere information technical equipment caustically, cause the earth leakage protective electric cabinet breaker misoperation that is subject to is housed in TN-S grounding system.
Adopt the device of sort circuit design not meet the following regulation that the TN system earth to many power supplys is made in IEC60364-1:2005 and GB/T16895.1-2008 simultaneously, be that the central point of transformer does not allow in transformer room ground connection nearby, must in low-voltage distribution cabinet, " be a bit connected " with PE line.
Utility model content
Goal of the invention: for the ground connection new regulation in IEC60364-1:2005 and GB/T16895.1-2008, the utility model provides a kind of TN double power-supply system transformer grounding current sensing means.
Technical scheme: in order to realize foregoing invention object, the technical solution adopted in the utility model is:
A kind of TN double power-supply system transformer grounding current sensing means, comprise electric interlocking circuit, earthing module, earth current instrument transformer 1TA and 2TA: described earth current instrument transformer 1TA and 2TA and described electric interlocking circuit are arranged in mother cabinet, described earthing module is separately positioned on 1# and be subject in electric cabinet and mother cabinet by electric cabinet, 2#; Earth current instrument transformer 1TA is subject to electric cabinet, 2# with the earthing module of mother cabinet be respectively connected by electric cabinet by electric interlocking circuit with 1# with 2TA, and 1# is subject to electric cabinet, 2# can move according to checking for grounded current output control respective circuit breakers by the earthing module of electric cabinet and mother cabinet.
As preferably, described electric interlocking circuit comprises AC intermediate relay K1～K5 and diode D1, D2; Diode D1, D2 have two effects: the one, prevent that the secondary current of earth current instrument transformer from returning by the secondary winding of another earth current instrument transformer, and the 2nd, earth current is reduced to half, the contact of AC intermediate relay can be born.
The detection signal of earth current instrument transformer 1TA can be subject to electric cabinet, 2# be connected with the earthing module of mother cabinet by electric cabinet with 1# respectively through three tunnels after diode D1, be connected by the earthing module of electric cabinet through K5 normally-closed contact, K3 the first normally-closed contact with 1#, be connected by the earthing module of electric cabinet through K2 normally opened contact, K3 the second normally-closed contact with 2#, be connected with the earthing module of mother cabinet through K5 normally-closed contact, K3 the first normally opened contact.
The detection signal of earth current instrument transformer 2TA can be subject to electric cabinet, 2# be connected with the earthing module of mother cabinet by electric cabinet with 1# respectively through three tunnels after diode D2, be connected by the earthing module of electric cabinet through K4 normally-closed contact, K3 the second normally-closed contact with 2#, be connected by the earthing module of electric cabinet through K1 normally opened contact, K3 the first normally-closed contact with 1#, be connected with the earthing module of mother cabinet through K4 normally-closed contact, K3 the second normally opened contact.
As preferably, described earth current instrument transformer 1TA and 2TA are located in mother cabinet on PE busbar and are positioned at the both sides of PE busbar and N busbar tie point.
For the different running method of TN double power-supply system transformer, by electric interlocking circuit, the detection signal of earth current instrument transformer 1TA and 2TA is delivered to difference and be subject to electric cabinet and bus cabinet, reach the object of correct detection earth current; Be subject to electric cabinet and bus earthing module cashier's office in a shop that corresponding circuit breaker is performed an action (reporting to the police or tripping operation) by difference again, specifically comprise several as follows:
(1) when mother cabinet and 1# are subject to that electric cabinet breaker closes a floodgate, 2# is while being subject to electric cabinet breaker separating brake, 1# is all loaded by the transformer belt of electric cabinet, and the detection signal of earth current instrument transformer 1TA and 2TA is delivered to 1# after merging by electric interlocking circuit and be subject to the earthing module of electric cabinet.
(2) when mother cabinet and 2# are subject to that electric cabinet breaker closes a floodgate, 1# is while being subject to electric cabinet breaker separating brake, 2# is all loaded by the transformer belt of electric cabinet, and the detection signal of earth current instrument transformer 1TA and 2TA is delivered to 2# after merging by electric interlocking circuit and be subject to the earthing module of electric cabinet.
(3) in the time that mother cabinet breaker separating brake, 1# are subject to electric cabinet and 2# closed a floodgate by electric cabinet breaker, 1# is subject to electric cabinet and 2# to be subject to the transformer belt load of bus section, busbar section separately of electric cabinet, the detection signal of earth current instrument transformer 1TA is delivered to 1# by electric interlocking circuit and is subject to electric cabinet, and the detection signal of earth current instrument transformer 2TA is delivered to 2# and be subject to the earthing module of electric cabinet by electric interlocking circuit.
(4) in the time that mother cabinet, 1# are subject to electric cabinet and 2# all closed a floodgate by electric cabinet breaker, 1# is subject to electric cabinet and 2# to be subject to the parallel operation of transformers of electric cabinet, the detection signal of earth current instrument transformer 1TA and 2TA is delivered to mother cabinet after merging by electric interlocking circuit, while there is earth fault, first make the breaker open operation of mother cabinet, then the detection signal of earth current instrument transformer 1TA is delivered to 1# by electric interlocking circuit and is subject to electric cabinet, and the detection signal of earth current instrument transformer 2TA is delivered to 2# and be subject to the earthing module of electric cabinet by electric interlocking circuit.
Beneficial effect: in the utility model, PE busbar is connected with N busbar and by earth current instrument transformer 1TA being set on PE busbar and 2TA detects transformer grounding electric current, meets the new regulation for transformer grounding in IEC60364-1:2005 and GB/T 16895.1-2008; Electric talk-back circuit and the reaction sensitivity that circuit breaker can improve fault time is set of earthing module and the thermal stability of each section of earthing conductor simultaneously; The utility model has solved the detection to transformer grounding electric current under new regulation, has improved the coefficient of safety of transformer, has guaranteed to be subject to electric cabinet safe and stable operation.
Accompanying drawing explanation
Fig. 1 is key wiring diagram of the present utility model;
Fig. 2 is electric interlocking circuit schematic diagram of the present utility model;
Fig. 3 is the electric talk-back circuit schematic diagram after simplifying;
Fig. 4 is the winding diagram that is subject to electric cabinet and mother cabinet.
Embodiment
Below in conjunction with embodiment, the technical solution of the utility model is elaborated; be noted that the following stated is only preferred implementation of the present utility model; but protection range of the present utility model is not limited to embodiment; for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Embodiment
TN double power-supply system transformer grounding current sensing means key wiring diagram as shown in Figure 1, sequence number 1 represents that 1# is subject to electric cabinet, sequence number 2 to represent that 2# is subject to electric cabinet, sequence number 3 to represent that mother cabinet, sequence number 4 represent that electric interlocking circuit, sequence number 5 represent earthing module; 1TB represents that 1# power becomes, 2TB represents that the change of 2# power, 1TA and 2TA represent that earth current instrument transformer, 1QF represent that 1# is subject to circuit breaker, the 2QF of electric cabinet to represent that 2# is subject to circuit breaker, the 3QF of electric cabinet to represent the circuit breaker of mother cabinet.
Earth current instrument transformer 1TA and 2TA are located in mother cabinet on PE busbar and are positioned at the both sides of PE busbar and N busbar tie point, in mother cabinet, electric interlocking circuit are set simultaneously, and earthing module is separately positioned on 1# and be subject in electric cabinet and mother cabinet by electric cabinet, 2#.For the different running method of TN double power-supply system transformer, by electric interlocking circuit, the detection signal of earth current instrument transformer 1TA and 2TA is delivered to the different earthing modules that is subject to electric cabinet and mother cabinet, reach the object of correct detection earth current; Be subject to electric cabinet, 2# to be subject to electric cabinet and mother earthing module cashier's office in a shop to make circuit breaker carry out corresponding action (reporting to the police or tripping operation) by 1# again.
Electric interlocking circuit key wiring diagram as shown in Figure 2, sequence number (a) represents that detection signal delivers to earthing module, sequence number (b) that 1# is subject to electric cabinet and represent that detection signal delivers to the earthing module of mother cabinet, sequence number (c) and represent that the detection signal earthing module that is subject to electric cabinet of delivering to 2#, fuse, the K1～K3 that FU is protective circuit are that AC intermediate relay, D1 and D2 are diode.
In figure, D1, D2 diode have two effects: the one, prevent that the secondary current of earth current instrument transformer from returning by the secondary winding of another earth current instrument transformer, and the 2nd, earth current is reduced to half, the contact of auxiliary relay can be born.
Different running method for TN double power-supply system transformer is described below respectively:
(1) 1# is subject to electric cabinet and mother cabinet breaker closure, 2# disconnected by electric cabinet breaker, is all loaded by 1# transformer belt:
Under this operational mode, circuit breaker often open auxiliary contact 1QF and 3QF closure, 2QF disconnects, relay K 1 electric, K2 and K3 dead electricity; The signal of earth current instrument transformer 1TA and 2TA flows to 1# by unique some A413 and is subject to electric cabinet earthing module.
(2) 2# is subject to electric cabinet and mother cabinet breaker closure, 1# disconnected by electric cabinet breaker, is all loaded by 2# transformer belt:
Under this operational mode, circuit breaker often open auxiliary contact 2QF and 3QF closure, 1QF disconnects, relay K 2 electric, K1 and K3 dead electricity; The signal of earth current instrument transformer 1TA and 2TA flows to 2# by unique some B413 and is subject to electric cabinet earthing module.
(3) 1# is subject to electric cabinet and 2# disconnected by electric cabinet breaker closure, mother cabinet breaker, two transformer belts load separately:
Under this operational mode, circuit breaker often open auxiliary contact 1QF and 2QF closure, 3QF disconnects, relay K 1, the equal dead electricity of K2, K3; The signal of earth current instrument transformer 1TA flows to 1# by unique some A413 and is subject to electric cabinet earthing module, and the signal of earth current instrument transformer 2TA flows to 2# by unique some B413 and is subject to electric cabinet earthing module.
(4) 1# is subject to electric cabinet, 2# to be subject to electric cabinet, mother cabinet breaker all closed, two parallel operation of transformers:
This operational mode is extreme mode (generally need not), circuit breaker often to open auxiliary contact 1QF, 2QF, 3QF all closed, relay K 1 and K2 dead electricity, K3 obtain electric; The signal of earth current instrument transformer 1TA and 2TA flows to mother cabinet earthing module by unique some C413.
If determine which section bus generation earth fault, first make the tripping operation of mother cabinet breaker, detection is then identical with process (3).
If there is no the extreme operational mode of process (4), electric interlocking circuit principle can be simplified, as shown in Figure 3.
Be subject to the wiring of electric cabinet and mother cabinet as shown in Figure 4, take the CW3 circuit breaker of Changshu Switch Factory as example.
Claims (7)
1. a TN double power-supply system transformer grounding current sensing means, is characterized in that: comprise electric interlocking circuit, earthing module, earth current instrument transformer 1TA and 2TA; Described earth current instrument transformer 1TA and 2TA and described electric interlocking circuit are arranged in mother cabinet, and described earthing module is separately positioned on 1# and be subject in electric cabinet and mother cabinet by electric cabinet, 2#; Earth current instrument transformer 1TA is subject to electric cabinet, 2# with the earthing module of mother cabinet be respectively connected by electric cabinet by electric interlocking circuit with 1# with 2TA, and 1# is subject to electric cabinet, 2# can move according to checking for grounded current output control respective circuit breakers by the earthing module of electric cabinet and mother cabinet.
2. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, is characterized in that: described electric interlocking circuit comprises AC intermediate relay K1～K5 and diode D1, D2;
The detection signal of earth current instrument transformer 1TA can be subject to electric cabinet, 2# be connected with the earthing module of mother cabinet by electric cabinet with 1# respectively through three tunnels after diode D1, be connected by the earthing module of electric cabinet through K5 normally-closed contact, K3 the first normally-closed contact with 1#, be connected by the earthing module of electric cabinet through K2 normally opened contact, K3 the second normally-closed contact with 2#, be connected with the earthing module of mother cabinet through K5 normally-closed contact, K3 the first normally opened contact;
The detection signal of earth current instrument transformer 2TA can be subject to electric cabinet, 2# be connected with the earthing module of mother cabinet by electric cabinet with 1# respectively through three tunnels after diode D2, be connected by the earthing module of electric cabinet through K4 normally-closed contact, K3 the second normally-closed contact with 2#, be connected by the earthing module of electric cabinet through K1 normally opened contact, K3 the first normally-closed contact with 1#, be connected with the earthing module of mother cabinet through K4 normally-closed contact, K3 the second normally opened contact.
3. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, is characterized in that: described earth current instrument transformer 1TA and 2TA are located in mother cabinet on PE busbar and are positioned at the both sides of PE busbar and N busbar tie point.
4. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, it is characterized in that: when mother cabinet and 1# are subject to that electric cabinet breaker closes a floodgate, 2# is while being subject to electric cabinet breaker separating brake, 1# is all loaded by the transformer belt of electric cabinet, and the detection signal of earth current instrument transformer 1TA and 2TA is delivered to 1# after merging by electric interlocking circuit and be subject to the earthing module of electric cabinet.
5. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, it is characterized in that: when mother cabinet and 2# are subject to that electric cabinet breaker closes a floodgate, 1# is while being subject to electric cabinet breaker separating brake, 2# is all loaded by the transformer belt of electric cabinet, and the detection signal of earth current instrument transformer 1TA and 2TA is delivered to 2# after merging by electric interlocking circuit and be subject to the earthing module of electric cabinet.
6. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, it is characterized in that: in the time that mother cabinet breaker separating brake, 1# are subject to electric cabinet and 2# closed a floodgate by electric cabinet breaker, 1# is subject to electric cabinet and 2# to be subject to the transformer belt load of bus section, busbar section separately of electric cabinet, the detection signal of earth current instrument transformer 1TA is delivered to 1# by electric interlocking circuit and is subject to electric cabinet, and the detection signal of earth current instrument transformer 2TA is delivered to 2# and be subject to the earthing module of electric cabinet by electric interlocking circuit.
7. TN double power-supply system transformer grounding current sensing means as claimed in claim 1, it is characterized in that: when mother cabinet, when 1# is subject to electric cabinet and 2# all closed a floodgate by electric cabinet breaker, 1# is subject to electric cabinet and 2# to be subject to the parallel operation of transformers of electric cabinet, the detection signal of earth current instrument transformer 1TA and 2TA is delivered to mother cabinet after merging by electric interlocking circuit, while there is earth fault, first make the breaker open operation of mother cabinet, then the detection signal of earth current instrument transformer 1TA is delivered to 1# by electric interlocking circuit and is subject to electric cabinet, the detection signal of earth current instrument transformer 2TA is delivered to 2# and is subject to the earthing module of electric cabinet by electric interlocking circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320860232.5U CN203674563U (en) | 2013-12-24 | 2013-12-24 | TN dual power system transformer ground current detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320860232.5U CN203674563U (en) | 2013-12-24 | 2013-12-24 | TN dual power system transformer ground current detection device |
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| CN203674563U true CN203674563U (en) | 2014-06-25 |
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| CN201320860232.5U Expired - Fee Related CN203674563U (en) | 2013-12-24 | 2013-12-24 | TN dual power system transformer ground current detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720602A (en) * | 2016-01-21 | 2016-06-29 | 易事特集团股份有限公司 | Photovoltaic grid-connected power generating energy storage inverter grid-connected-off-grid system and operation device thereof |
| CN105742836A (en) * | 2016-03-16 | 2016-07-06 | 国网天津宝坻供电有限公司 | Grounding method of power distribution room |
-
2013
- 2013-12-24 CN CN201320860232.5U patent/CN203674563U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720602A (en) * | 2016-01-21 | 2016-06-29 | 易事特集团股份有限公司 | Photovoltaic grid-connected power generating energy storage inverter grid-connected-off-grid system and operation device thereof |
| CN105720602B (en) * | 2016-01-21 | 2019-02-05 | 易事特集团股份有限公司 | Parallel network power generation energy storage inverter is grid-connected-off-grid system and its running gear |
| CN105742836A (en) * | 2016-03-16 | 2016-07-06 | 国网天津宝坻供电有限公司 | Grounding method of power distribution room |
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