CN205898908U - Snow -melting system realizes that three phase current lacks looks observation circuit - Google Patents
Snow -melting system realizes that three phase current lacks looks observation circuit Download PDFInfo
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- CN205898908U CN205898908U CN201620895195.5U CN201620895195U CN205898908U CN 205898908 U CN205898908 U CN 205898908U CN 201620895195 U CN201620895195 U CN 201620895195U CN 205898908 U CN205898908 U CN 205898908U
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Abstract
The utility model relates to a snow -melting system realizes that three phase current lacks looks observation circuit, characterized by: it includes switching power supply (1), current -voltage monitoring module (2), first relay (J1) and second relay (J2) at least, and the three phase voltage L1 of three -phase four -wire power, L2, two L3 are connected with six contact points electricity of current -voltage monitoring module (2) each other, the first phase line and the zero line of three -phase four -wire power are connected with the input electricity of first relay (J1), the second phase line and the zero line of three -phase four -wire input power are connected with the input electricity of second relay (J2). This kind of snow -melting system realizes that three phase current lacks looks observation circuit to do not influence the monitoring to its scarce looks power wherein lacking the phase time.
Description
Technical field
This utility model is related to a kind of snow-melting system and realizes open phases of three-phase power source observation circuit, and it is applied to domestic dispatch from foreign news agency and adds
Hot turnout snow melting system switch board is powered three phase mains carries out the circuit of phase shortage monitoring and builds.
Background technology
According to " passenger dedicated railway line Signal Products provisional technical conditions compilation (one) _ electrical heating melting snow on turnout junction equipment " (section
Skill transports [2008] No. 36) require: switch board need to be monitored to three phase supply power phase shortage.
Existing control circuit pass through to take that mutually electricity do not do phase shortage monitoring, do phase shortage just for other two-phase power supply
Monitoring.And switch board adopts three-phase four-wire power supply mode, no other external power supplys, control circuit needs to take a phase power supply,
When this phase power phase shortage that control circuit takies, control circuit can not work, and therefore this phase power phase shortage can not be reported
Alert.
Content of the invention
The purpose of this utility model is to provide a kind of snow-melting system to realize open phases of three-phase power source observation circuit, so that wherein
The monitoring to its phase shortage power supply is not affected during phase shortage.
The purpose of this utility model is to provide a kind of snow-melting system to realize open phases of three-phase power source observation circuit, and it at least includes
Switching Power Supply, current/voltage monitoring modular, the first relay j1 and the second relay j2, the three-phase voltage of three-phase four-wire power
L1, l2, l3 two is electrically connected with six contact points of current/voltage monitoring modular each other；First phase of three-phase four-wire power
Line and zero line are electrically connected with the input of the first relay j1；Second phase line of three-phase and four-line input power and zero line continue with second
The input electrical connection of electrical equipment j2；The contact 4 and 8 of the normally-closed contact (12,4) of the second relay j2 and normally opened contact (12,8) with
Three-phase voltage l2, l3 line input electrically connects, the common 12 and first of normally-closed contact (12,4) and normally opened contact (12,8)
The contact 4 of the normally-closed contact (12,4) of relay j1 electrically connects；The contact 8 and three of the normally opened contact (12,8) of the first relay j1
The input electrical connection of phase voltage l1, the common 12 of the first relay j1 is electrically connected with the ac input end l phase of Switching Power Supply
Connect；The ac input end o phase of Switching Power Supply is electrically connected with the zero line of three-phase voltage；The direct current output of Switching Power Supply and current/voltage
The voltage end electrical connection of monitoring modular.
Described Switching Power Supply output dc24v.
The first described relay j1 and the second relay j2 at least has 1 group of normally opened contact, 1 group of normally-closed contact.
The running voltage of the first described relay j1 and the second relay j2 is exchange 220v.
Operation principle: in the case of in addition not providing control power supply, snow-melting system is realized by relay conversion circuit
Open phases of three-phase power source Monitoring Design, when three-phase input power supply wherein is mutually or during biphase phase shortage, control circuit Switching Power Supply defeated
Enter and automatic jump on the normal mutually electricity of power supply by relay circuit, only three-phase all phase shortage when, power supply has a power failure, and controls
Cabinet quits work.
Feature of the present utility model is:
Control section power supply does not need to provide extra ac220v, directly adopts monitored three-phase input power supply.
When any one phase of three-phase input power supply or biphase phase shortage, phase shortage monitoring modular is working properly.
Brief description
Fig. 1 is that snow-melting system switch board realizes open phases of three-phase power source monitoring electrical schematic diagram.
In figure, 1, Switching Power Supply；2nd, current/voltage monitoring modular；3rd, cvs module；J1, the first relay；J2 continues for first
Electrical equipment.
Specific embodiment
As shown in figure 1, providing a kind of snow-melting system to realize open phases of three-phase power source observation circuit, it at least includes: switch electricity
Source 1, current/voltage monitoring modular 2, the first relay j1 and the second relay j2, the three-phase voltage l1 of three-phase four-wire power, l2,
L3 two is electrically connected with six contact points of current/voltage monitoring modular 2 each other；First phase line of three-phase four-wire power and
Zero line is electrically connected with the input of the first relay j1；Second phase line of three-phase and four-line input power and zero line and the second relay
The input electrical connection of j2；The contact 4 of the normally-closed contact (12,4) of the second relay j2 and normally opened contact (12,8) and 8 and three-phase
The electrical connection of voltage l2, l3 line input, the common 12 of normally-closed contact (12,4) and normally opened contact (12,8) and the first relay
The contact 4 of the normally-closed contact (12,4) of device j1 electrically connects；The contact 8 of normally opened contact (12,8) of the first relay j1 and three-phase electricity
The input electrical connection of pressure l1, the common 12 of the first relay j1 is electrically connected with the ac input end l of Switching Power Supply 1；
The ac input end o phase of Switching Power Supply 1 is electrically connected with the zero line of three-phase voltage；The direct current output of Switching Power Supply 1 and current/voltage
The voltage end electrical connection of monitoring modular 2.
First relay j1 and the second relay j2 at least has 1 group of normally opened contact, 1 group of normally-closed contact.
Switching Power Supply 1 exports dc24v.
The running voltage of the first relay j1 and the second relay j2 is exchange 220v.
Work process of the present utility model is:
When l1 phase shortage,
J1 falls, and j2 picks up, and l2 arrives Switching Power Supply 1 by the normally opened contact (12,8) of j2 and the normally-closed contact (12,4) of j1
L, Switching Power Supply 1 powered by l2 and n line, exports dc24v to cvs module 3.
When l2 phase shortage,
J1 picks up, and j2 falls, and l1 arrives the l of Switching Power Supply 1 by the normally opened contact (12,8) of j1, and Switching Power Supply 1 passes through l1
Power with n line, export dc24v to cvs module 3.
When l3 phase shortage,
J1 picks up, and j2 picks up, and l1 arrives the l of Switching Power Supply 1 by the normally opened contact (12,8) of j1, and Switching Power Supply 1 passes through l1
Power with n line, export dc24v to cvs module 3.
When l1, l2 phase shortage,
J1 falls, and j2 falls, and l3 arrives Switching Power Supply 1 by the normally-closed contact (12,4) of j2 and the normally-closed contact (12,4) of j1
L, Switching Power Supply 1 powered by l3 and n line, exports dc24v to cvs module 3.
When l1, l3 phase shortage,
J1 falls, and j2 picks up, and l2 arrives Switching Power Supply 1 by the normally opened contact (12,8) of j2 and the normally-closed contact (12,4) of j1
L, Switching Power Supply 1 powered by l2 and n line, exports dc24v to cvs module 3.
When l2, l3 phase shortage,
J1 picks up, and j2 falls, and l1 arrives the l of Switching Power Supply 1 by the normally opened contact (12,8) of j1, and Switching Power Supply 1 passes through l1
Power with n line, export dc24v to cvs module 3.
Claims (4)
1. a kind of snow-melting system realizes open phases of three-phase power source observation circuit, it is characterized in that: it at least includes Switching Power Supply (1), electricity
Stream voltage monitoring module (2), the first relay (j1) and the second relay (j2), the three-phase voltage l1 of three-phase four-wire power, l2,
L3 two is electrically connected with six contact points of current/voltage monitoring modular (2) each other；First phase line of three-phase four-wire power
Electrically connect with the input of the first relay (j1) with zero line；Second phase line of three-phase and four-line input power and zero line continue with second
The input electrical connection of electrical equipment (j2)；The normally-closed contact (12,4) of the second relay (j2) and the contact 4 of normally opened contact (12,8)
Electrically connect with three-phase voltage l2, l3 line input with 8, the common of normally-closed contact (12,4) and normally opened contact (12,8) 12 with
The contact 4 of the normally-closed contact (12,4) of the first relay (j1) electrically connects；The normally opened contact (12,8) of the first relay (j1)
Contact 8 is electrically connected with the input of three-phase voltage l1, and the common 12 of the first relay (j1) is exchanged with Switching Power Supply (1)
Input l is electrically connected；The ac input end o phase of Switching Power Supply (1) is electrically connected with the zero line of three-phase voltage l1, l2, l3；Switch
The direct current output of power supply (1) is electrically connected with the voltage end of current/voltage monitoring modular (2).
2. a kind of snow-melting system according to claim 1 realizes open phases of three-phase power source observation circuit, it is characterized in that: described
First relay (j1) and the second relay (j2) at least have 1 group of normally opened contact, 1 group of normally-closed contact.
3. a kind of snow-melting system according to claim 1 realizes open phases of three-phase power source observation circuit, it is characterized in that: switch electricity
Source (1) exports dc24v.
4. a kind of snow-melting system according to claim 1 realizes open phases of three-phase power source observation circuit, it is characterized in that: described
First relay (j1) is to exchange 220v with the running voltage of the second relay (j2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620895195.5U CN205898908U (en) | 2016-08-18 | 2016-08-18 | Snow -melting system realizes that three phase current lacks looks observation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620895195.5U CN205898908U (en) | 2016-08-18 | 2016-08-18 | Snow -melting system realizes that three phase current lacks looks observation circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN205898908U true CN205898908U (en) | 2017-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620895195.5U Active CN205898908U (en) | 2016-08-18 | 2016-08-18 | Snow -melting system realizes that three phase current lacks looks observation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308229A (en) * | 2020-02-24 | 2020-06-19 | 广东美的暖通设备有限公司 | Drive control circuit and air conditioner |
-
2016
- 2016-08-18 CN CN201620895195.5U patent/CN205898908U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308229A (en) * | 2020-02-24 | 2020-06-19 | 广东美的暖通设备有限公司 | Drive control circuit and air conditioner |
| CN111308229B (en) * | 2020-02-24 | 2021-11-30 | 广东美的暖通设备有限公司 | Drive control circuit and air conditioner |
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