CN104134967A - Neutral line breaking protection device - Google Patents
Neutral line breaking protection device Download PDFInfo
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- CN104134967A CN104134967A CN201410409351.8A CN201410409351A CN104134967A CN 104134967 A CN104134967 A CN 104134967A CN 201410409351 A CN201410409351 A CN 201410409351A CN 104134967 A CN104134967 A CN 104134967A
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Abstract
The invention discloses a neutral line breaking protection device. Voltage between three phases of lines of an three-phase alternating current circuit and a neutral line is monitored through a first overvoltage relay, a second overvoltage relay and a third overvoltage relay respectively. When the neutral line is broken, at least one of the first overvoltage relay, the second overvoltage relay and the third overvoltage relay will monitor voltage larger than a second preset voltage value, and then the corresponding overvoltage relay is closed, so that the switch control part of a circuit breaker bears voltage larger than the first preset voltage value, the switch control part controls a switch to be opened, and an electric appliance on the user side is powered off. By the adoption of the neutral line breaking protection device, when the neutral line is broken, a power supply access of the electric appliance can be turned off, so that damage caused by neutral line breaking on the electric appliance is reduced, and power supply system reliability is improved.
Description
Technical field
The present invention relates to electric power detection field, particularly relate to a kind of broken neutral line protective device.
Background technology
In China, the generation of electric energy, conveying, distribution almost all adopt three-phase alternating current at present, and supply power mode is three-phase four-wire system.Known theoretically: this supply power mode is only under the condition of load symmetry, and neutral current is just zero.
But in actual applications, because the load of every phase is different, therefore threephase load can not be symmetrical, each phase current is also just different, so the neutral line has electric current.If in the asymmetric situation of load, the neutral line opens circuit for a certain reason, can cause certain phase voltage significantly raise or reduce, reach as high as 380V, minimum can be lower than 100V, these all kinds of electrical appliances that are 220V for rated voltage can cause great harm.
Along with society is more and more higher to the requirement of power supply reliability, the importance of low-voltage distribution system broken neutral line protection is day by day obvious, in the urgent need to fundamentally being solved.The breaking protection of the low-voltage distribution system neutral line loses significant, on-the-spot also in the urgent need to a kind of device with broken neutral line defencive function for raising power supply reliability, raising power supply quality, minimizing power equipment.
Summary of the invention
The object of this invention is to provide a kind of broken neutral line protective device, when the neutral line opens circuit, can cut off the power path of electrical appliance, thereby reduce the infringement that the neutral line opens circuit to electrical appliance, improve the reliability of electric power system.
For achieving the above object, the invention provides following scheme:
A broken neutral line protective device, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the first phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the second phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the second phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the second phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
Optionally, described switching control section is specially magnetictrip.
Optionally, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
A broken neutral line protective device, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the second phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the third phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the third phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the third phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
Optionally, described switching control section is specially magnetictrip.
Optionally, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
A broken neutral line protective device, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the first phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the third phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the third phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the third phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
Optionally, described switching control section is specially magnetictrip.
Optionally, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
According to specific embodiment provided by the invention, the invention discloses following technique effect:
Broken neutral line protective device of the present invention, by the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay are monitored each the phase circuit in three-phase circuit and the voltage between the neutral line respectively, when the neutral line opens circuit, the first overvoltage relay, at least one in the second overvoltage relay and the 3rd overvoltage relay can monitor the voltage that is greater than the second predeterminated voltage value, then corresponding overvoltage relay can be closed, thereby the switching control section carrying (between the first phase line and the second phase line) that makes described circuit breaker is greater than the voltage of the first predeterminated voltage value, described switching control section can be controlled described switch and disconnect, thereby make the electrical appliance power-off of user's side.Therefore, the broken neutral line protective device of the embodiment of the present invention, when the neutral line opens circuit, can cut off the power path of electrical appliance, thereby reduces the infringement that the neutral line opens circuit to electrical appliance, improves the reliability of electric power system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structure chart of the embodiment of broken neutral line protective device of the present invention;
Fig. 2 is the schematic diagram of the circuit breaker 104 in the embodiment of the present invention;
Fig. 3 is the schematic diagram of the first overvoltage relay in the embodiment of the present invention;
Fig. 4 is the schematic diagram of the second overvoltage relay in the embodiment of the present invention;
Fig. 5 is the schematic diagram of the 3rd overvoltage relay in the embodiment of the present invention;
Fig. 6 is the structure chart of the embodiment of another kind of broken neutral line protective device of the present invention;
Fig. 7 is the structure chart of the embodiment of another kind of broken neutral line protective device of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the structure chart of the embodiment of broken neutral line protective device of the present invention.As shown in Figure 1, this device can comprise:
The first overvoltage relay KV1, the second overvoltage relay KV2 and the 3rd overvoltage relay KV3 and circuit breaker 104;
Fig. 2 is the schematic diagram of the circuit breaker 104 in the embodiment of the present invention.As shown in Figure 2, described circuit breaker 104 comprises switch 1041 and switching control section 1042;
In Fig. 1, described switch 1041 is arranged in the triple line in the three-phase circuit of user's side, be arranged in the front end of the electrical appliance (electrical appliance that Fig. 1 101 represents in the first phase line, 102 represent the electrical appliance in the second phase line, the electrical appliance on 103 expression third phase lines) of user's side; Described switching control section 1042 comprises the first terminals 10421 and the second terminals 10422; Described the first terminals 10421 are connected with the first phase line A in described three-phase circuit; When the voltage between described the first terminals 10421 and the second terminals 10422 is greater than the first predeterminated voltage value, described switching control section 1042 is controlled described switch 1041 and is disconnected.It should be noted that, the neutral line in three-phase circuit is normal, and each electrical appliance is when normally work, and described switch 1041 is in closure state.
Fig. 3 is the schematic diagram of the first overvoltage relay in the embodiment of the present invention.
Fig. 4 is the schematic diagram of the second overvoltage relay in the embodiment of the present invention.
Fig. 5 is the schematic diagram of the 3rd overvoltage relay in the embodiment of the present invention.
As shown in Fig. 3 to 5 and Fig. 1:
Described the first overvoltage relay KV1 comprises the first terminals 301, the second terminals 302, the 3rd terminals 303 and the 4th terminals 304; Described the first terminals 301 are connected with the first phase line A in described three-phase circuit, and the neutral line N in described the second terminals 302 and described three-phase circuit and the loop of described electrical appliance (101,102,103) are connected; Described the 3rd terminals 303 are connected with the second phase line B in described three-phase circuit, and described the 4th terminals 304 are connected with described second terminals 10422 of the described switching control section 1042 of described circuit breaker 104; Described the first terminals 301 and described the second terminals 302 are for detection of the first voltage between described the first phase line A and described neutral line N, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals 303 of described the first overvoltage relay KV1 and described the 4th terminals 304;
Described the second overvoltage relay KV2 comprises the 5th terminals 305, the 6th terminals 306, the 7th terminals 307 and the 8th terminals 308; Described the 5th terminals 305 are connected with the second phase line B in described three-phase circuit, and described the 6th terminals 306 are connected with neutral line N in described three-phase circuit and the loop of described electrical appliance; Described the 7th terminals 307 are connected with the second phase line B in described three-phase circuit, and described the 8th terminals 308 are connected with described second terminals 10422 of the described switching control section 1042 of described circuit breaker 104; Described the 5th terminals 306 and described the 6th terminals 306 are for detection of the second voltage between described the second phase line B and described neutral line N, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals 307 of described the second overvoltage relay KV2 and described the 8th terminals 308;
Described the 3rd overvoltage relay KV3 comprises the 9th terminals 309, the tenth terminals the 310, the 11 terminals 311 and the 12 terminals 312; Described the 9th terminals 309 are connected with the third phase line C in described three-phase circuit, and described the tenth terminals 310 are connected with neutral line N in described three-phase circuit and the loop of described electrical appliance; Described the 11 terminals 311 are connected with the second phase line B in described three-phase circuit, and described the 12 terminals 312 are connected with described second terminals 10422 of the described switching control section 1042 of described circuit breaker 104; Described the 9th terminals 309 and described the tenth terminals 310 are for detection of the tertiary voltage between described third phase line C and described neutral line N, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals 311 of described the 3rd overvoltage relay KV3 and described the 12 terminals 312.
In sum, broken neutral line protective device of the present invention, by the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay are monitored each the phase circuit in three-phase circuit and the voltage between the neutral line respectively, when the neutral line opens circuit, the first overvoltage relay, at least one in the second overvoltage relay and the 3rd overvoltage relay can monitor the voltage that is greater than the second predeterminated voltage value, then corresponding overvoltage relay can be closed, thereby the switching control section carrying (between the first phase line and the second phase line) that makes described circuit breaker is greater than the voltage of the first predeterminated voltage value, described switching control section can be controlled described switch and disconnect, thereby make the electrical appliance power-off of user's side.Therefore, the broken neutral line protective device of the embodiment of the present invention, when the neutral line opens circuit, can cut off the power path of electrical appliance, thereby reduces the infringement that the neutral line opens circuit to electrical appliance, improves the reliability of electric power system.
In practical application, described switching control section is specifically as follows magnetictrip.
In practical application, described switch specifically can comprise the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically can comprise:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
The invention also discloses another kind of broken neutral line protective device.
Fig. 6 is the structure chart of the embodiment of another kind of broken neutral line protective device of the present invention.As shown in Figure 6, this device and the device broadly similar shown in Fig. 1, its difference is:
In Fig. 6, the first terminals of the switching control section of circuit breaker 104 are connected with the second phase line B in described three-phase circuit, the 3rd terminals of the first overvoltage relay KV1, the 7th terminals of the second overvoltage relay KV2, the 11 terminals of the 3rd overvoltage relay KV3 are all connected with the third phase line C in described three-phase circuit.When the neutral line opens circuit, what the switching control section of described circuit breaker carried is the voltage between the second phase line and third phase line.
Concrete, when the neutral line opens circuit, at least one in the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay can monitor the voltage that is greater than the second predeterminated voltage value, then corresponding overvoltage relay can be closed, thereby the switching control section carrying (between the second phase line and third phase line) that makes described circuit breaker is greater than the voltage of the first predeterminated voltage value, described switching control section can be controlled described switch and disconnect, thereby makes the electrical appliance power-off of user's side.
The invention also discloses another kind of broken neutral line protective device.
Fig. 7 is the structure chart of the embodiment of another kind of broken neutral line protective device of the present invention.As shown in Figure 7, this device and the device broadly similar shown in Fig. 1, its difference is:
In Fig. 7, the first terminals of the switching control section of circuit breaker 104 are connected with the first phase line A in described three-phase circuit, the 3rd terminals of the first overvoltage relay KV1, the 7th terminals of the second overvoltage relay KV2, the 11 terminals of the 3rd overvoltage relay KV3 are all connected with the third phase line C in described three-phase circuit.When the neutral line opens circuit, what the switching control section of described circuit breaker carried is the voltage between the first phase line and third phase line.
Concrete, when the neutral line opens circuit, at least one in the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay can monitor the voltage that is greater than the second predeterminated voltage value, then corresponding overvoltage relay can be closed, thereby the switching control section carrying (between the first phase line and third phase line) that makes described circuit breaker is greater than the voltage of the first predeterminated voltage value, described switching control section can be controlled described switch and disconnect, thereby makes the electrical appliance power-off of user's side.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a broken neutral line protective device, is characterized in that, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the first phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the second phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the second phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the second phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
2. device according to claim 1, is characterized in that, described switching control section is specially magnetictrip.
3. device according to claim 1, is characterized in that, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
4. a broken neutral line protective device, is characterized in that, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the second phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the third phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the third phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the third phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
5. device according to claim 4, is characterized in that, described switching control section is specially magnetictrip.
6. device according to claim 4, is characterized in that, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
7. a broken neutral line protective device, is characterized in that, comprising: the first overvoltage relay, the second overvoltage relay and the 3rd overvoltage relay and circuit breaker;
Described circuit breaker comprises switch and switching control section; Described switch is arranged in the triple line in the three-phase circuit of user's side, is positioned at the front end of the electrical appliance of user's side; Described switching control section comprises the first terminals and the second terminals; Described the first terminals are connected with the first phase line in described three-phase circuit; When the voltage between described the first terminals and the second terminals is greater than the first predeterminated voltage value, described switching control section is controlled described switch and is disconnected;
Described the first overvoltage relay comprises the first terminals, the second terminals, the 3rd terminals and the 4th terminals; Described the first terminals are connected with the first phase line in described three-phase circuit, and described the second terminals are connected with the neutral line in described three-phase circuit; Described the 3rd terminals are connected with the third phase line in described three-phase circuit, and described the 4th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the first terminals and described the second terminals are for detection of the first voltage between described the first phase line and the described neutral line, when described the first voltage is greater than the second predeterminated voltage value, the switch between closed described the 3rd terminals of described the first overvoltage relay and described the 4th terminals;
Described the second overvoltage relay comprises the 5th terminals, the 6th terminals, the 7th terminals and the 8th terminals; Described the 5th terminals are connected with the second phase line in described three-phase circuit, and described the 6th terminals are connected with the neutral line in described three-phase circuit; Described the 7th terminals are connected with the third phase line in described three-phase circuit, and described the 8th terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 5th terminals and described the 6th terminals are for detection of the second voltage between described the second phase line and the described neutral line, when described second voltage is greater than described the second predeterminated voltage value, the switch between closed described the 7th terminals of described the second overvoltage relay and described the 8th terminals;
Described the 3rd overvoltage relay comprises the 9th terminals, the tenth terminals, the 11 terminals and the 12 terminals; Described the 9th terminals are connected with the third phase line in described three-phase circuit, and described the tenth terminals are connected with the neutral line in described three-phase circuit; Described the 11 terminals are connected with the third phase line in described three-phase circuit, and described the 12 terminals are connected with described second terminals of the described switching control section of described circuit breaker; Described the 9th terminals and described the tenth terminals are for detection of the tertiary voltage between described third phase line and the described neutral line, when described tertiary voltage is greater than described the second predeterminated voltage value, the switch between closed described the 11 terminals of described the 3rd overvoltage relay and described the 12 terminals.
8. device according to claim 7, is characterized in that, described switching control section is specially magnetictrip.
9. device according to claim 7, is characterized in that, described switch specifically comprises the first switch, second switch and the 3rd switch, and described switch is arranged in the triple line in the three-phase circuit of user's side, specifically comprises:
Described the first switch is arranged in described the first phase line;
Described second switch is arranged in described the second phase line;
Described the 3rd switch is arranged on described third phase line;
Described the first switch, second switch and the 3rd switch integral body are controlled by described switching control section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410409351.8A CN104134967B (en) | 2014-08-19 | 2014-08-19 | A kind of broken neutral line protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410409351.8A CN104134967B (en) | 2014-08-19 | 2014-08-19 | A kind of broken neutral line protection device |
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| CN104134967A true CN104134967A (en) | 2014-11-05 |
| CN104134967B CN104134967B (en) | 2017-06-06 |
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| CN201410409351.8A Active CN104134967B (en) | 2014-08-19 | 2014-08-19 | A kind of broken neutral line protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473947A (en) * | 2018-06-29 | 2019-03-15 | 国家电网有限公司 | A kind of low-voltage platform area neutral point drifting protective device |
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| CN104134967B (en) | 2017-06-06 |
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