CN214125542U - Low-voltage heater control circuit - Google Patents
Low-voltage heater control circuit Download PDFInfo
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- CN214125542U CN214125542U CN202023003115.6U CN202023003115U CN214125542U CN 214125542 U CN214125542 U CN 214125542U CN 202023003115 U CN202023003115 U CN 202023003115U CN 214125542 U CN214125542 U CN 214125542U
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Abstract
The utility model relates to a low-voltage heater control circuit, one end of a breaker is connected with a mains supply, and the other end of the breaker is connected with a wire inlet end of a contactor; the outlet end of the circuit breaker is connected to a control power supply; the outlet end of the contactor is connected to the heater; arranging a current transformer on a circuit from the heater to the contactor; the heater control circuit is internally provided with a low-voltage line protection device for controlling the on-off of the contactor and controlling the heating of the heater; compared with the prior art, the utility model, adopted combination such as low pressure circuit protection device and thermometer and circuit breaker, can realize the protection to the current of circuit overcurrent, voltage excessive pressure and the current undercurrent, the voltage under-voltage state, solved in current heater control circuit, can not send out alarm or open circuit, lead to the consequence that electrical equipment damaged.
Description
Technical Field
The embodiment of the utility model relates to a heater control circuit, in particular to low pressure feed water heater control circuit.
Background
In the existing heater control circuit, a temperature controller and a contactor are generally combined for control, and the temperature controller is used for controlling the on and off of the contactor to realize temperature control.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low pressure feed water heater control circuit not only can realize temperature control to the heater, can realize providing like protection such as electric current overcurrent, voltage excessive pressure and electric current undercurrent, voltage under-voltage to the heater moreover.
In order to achieve the above object, an embodiment of the present invention provides a low pressure heater control circuit, including:
one end of the circuit breaker is connected with a mains supply, and the other end of the circuit breaker is connected with a wire inlet end of the contactor; the outlet end of the breaker is connected to a control power supply;
the outlet end of the contactor is connected to the heater;
a current transformer is arranged on a circuit from the heater to the contactor;
and the heater control circuit is internally provided with a low-voltage line protection device for controlling the on-off of the contactor and controlling the heating of the heater.
Wherein, the heater control circuit further comprises:
the first fuse is arranged on a phase line of the commercial power;
the second fuse is arranged on a phase line of the control power supply;
a test switch is arranged between the phase line of the mains supply and the phase line of the control power supply;
the phase line of the control power supply is respectively connected with the wire inlet end of the working signal of the high-voltage motor and the wire inlet end of the starting button;
the wire outlet end of the working signal of the high-voltage motor is connected with the wire inlet end of the first relay coil; the outlet end of the first relay coil is connected with a zero line;
the wire outlet end of the start button is connected with the wire inlet end of the stop button; a first normally open contact of the contactor is arranged on the starting button to form self-locking;
the wire outlet end of the stop button is connected with the wire inlet end of a first normally closed contact of the first relay, the wire outlet end of the first normally closed contact is connected with the wire inlet end of a normally closed contact of the temperature controller, and the wire inlet end and the wire outlet end of the normally closed contact of the temperature controller are connected with the wire inlet end of a coil of the circuit breaker and the wire inlet end of a coil of the second relay; the outlet end of the coil of the circuit breaker and the outlet end of the second relay coil are connected with a zero line of a control power supply;
the phase line of the control power supply is connected to the wire inlet end of a first normally open contact of the low-voltage line protection device, the wire outlet end of the first normally open contact of the low-voltage line protection device is connected with the wire inlet end of a circuit breaker coil, and the wire outlet end of the circuit breaker coil is connected with the zero line of the control power supply;
the phase line of the control power supply is connected to the wire inlet end of the first normally open contact of the second relay; the wire outlet end of the first normally open contact of the second relay is connected with the wire inlet ends of the first indicator light and the second indicator light; the wire outlet ends of the first indicator light and the second indicator light are connected with a zero line of a control power supply;
the phase line of the control power supply is connected to the wire inlet end of the first normally closed contact of the second relay; the wire outlet end of the first normally closed contact of the second relay is connected with the wire inlet ends of the third indicator light and the fourth indicator light; the wire outlet ends of the third indicator light and the fourth indicator light are connected with a zero line of a control power supply;
the control power supply is connected with the power supply of the low-voltage line protection device to provide power for the low-voltage line protection device.
The secondary side end of the current transformer and the zero line of the current transformer are respectively connected to the terminal Ia, the terminal Ib and the terminal Ic of the low-voltage line protection device; a Ua end and a Un end of the low-voltage line protection device are respectively connected with a control power supply; a second normally open contact of a second relay is connected to the end S2 of the low-voltage line protection device; a circuit breaker tripping signal normally-open contact of a circuit breaker is connected to the S3 end of the low-voltage line protection device; a breaker state signal normally open contact of a breaker is connected to the S4 end of the low-voltage line protection device; and PROFI-BUS communication cables are connected to the end A of the low-voltage line protection device and the end B of the low-voltage line protection device, the PROFI-BUS communication cables are connected to a temperature display, and the rest end points are suspended.
The short circuit is formed between the wire outlet end of the first terminal of the circuit breaker and the wire inlet end of the second terminal of the circuit breaker; and the wire outlet end of the first terminal of the contactor is in short circuit with the wire inlet end of the second terminal of the contactor.
Wherein, the low-voltage heater control circuit is a single-phase circuit.
Wherein, the circuit breaker is a 3VA series circuit breaker.
The current transformer is a threading current transformer.
Compared with the prior art, the utility model, adopted combination such as low pressure circuit protection device and thermometer and circuit breaker, can realize the protection to the current of circuit overcurrent, voltage excessive pressure and the current undercurrent, the voltage under-voltage state, solved in current heater control circuit, can not send out alarm or open circuit, lead to the consequence that electrical equipment damaged.
Drawings
Fig. 1 is a circuit diagram of a main circuit of the present invention;
FIG. 2 is a control circuit diagram of the present invention;
fig. 3 is a circuit connection diagram of the low voltage line protection device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The embodiment of the utility model provides an embodiment relates to a low pressure heater control circuit, as shown in figure 1, figure 2, include:
one end of the breaker QF is connected with commercial power supplies L2 and N, and the other end of the breaker QF is connected with the wire inlet end of the contactor KM; the outlet end of the circuit breaker KM is connected to a phase line L21 of a control power supply;
the outlet end of the contactor KM is connected to the heater R;
a current transformer TD is arranged on a circuit from the heater R to the contactor KM;
and the heater control circuit is internally provided with a low-voltage line protection device FCU for controlling the on-off of the contactor KM and controlling the heating of the heater R.
The circuit adopts the combination of the low-voltage line protection device, the thermometer, the circuit breaker and the like, and the low-voltage line protection device FCU can be used for protecting the current overcurrent, voltage overvoltage, current undercurrent, voltage undervoltage and other states of the circuit, so that the problem that the existing heater control circuit cannot give an alarm or break the circuit to cause the damage of electrical equipment is solved.
In order to realize the control in the present embodiment, as shown in fig. 1, the heater control circuit further includes:
the first fuse FU1 is arranged on a phase line of the mains supply L2;
a second fuse FU2 arranged on a phase line L21 of the control power supply;
a test switch S20 is arranged between a phase line of a commercial power L2 and a phase line L21 of a control power supply;
a phase line L21 of the control power supply is respectively connected with a wire inlet end of a working signal DL of the high-voltage motor and a wire inlet end of a starting button SB 1;
the outlet end of a working signal DL of the high-voltage motor is connected with the inlet end of the first relay coil KA 1; the outlet end of the first relay coil KA1 is connected with a zero line N;
the wire outlet end of the start button SB1 is connected with the wire inlet end of the stop button SB 2; a first normally open contact KM-1 of the contactor is arranged on the starting button SB to form self-locking;
the wire outlet end of the stop button SB2 is connected with the wire inlet end of a first normally closed contact KA1-1 of the first relay, the wire outlet end of the first normally closed contact KA1-1 is connected with the wire inlet end of a normally closed contact TC-1 of the temperature controller, and the wire outlet end of the normally closed contact TC-1 of the temperature controller is connected with the wire inlet end of a coil KM of the circuit breaker and the wire inlet end of a coil KA2 of a second relay coil; the outlet end of the coil KM of the circuit breaker and the outlet end of the coil KA2 of the second relay are connected with a zero line N of a control power supply; the circuit realizes the starting and stopping and the temperature control of the circuit in the embodiment, and meets the requirement that the circuit can work only under the working state of the working signal DL of the high-voltage motor.
A phase line L21 of the control power supply is connected to an incoming line end of a first normally open contact FCU-1 of the low-voltage line protection device, an outgoing line end of the first normally open contact FCU-1 of the low-voltage line protection device is connected with an incoming line end of a breaker coil QF, and an outgoing line end of the breaker coil QF is connected with a zero line N of the control power supply; the circuit is characterized in that a first normally open contact FCU-1 of the low-voltage circuit protection device is used for controlling the on-off of a coil QF of the circuit breaker, and the control of the low-voltage circuit protection device on the quick cut-off power supply of the circuit breaker is realized.
The phase line L21 of the control power supply is connected to the incoming line end of the first normally open contact KA2-1 of the second relay; the outlet end of the first normally open contact KA2-1 of the second relay is connected with the inlet ends of the first indicator light HR and the second indicator light 1 HR; the outlet ends of the first indicator light HR and the second indicator light 1HR are connected with a zero line N of the control power supply; the circuit is used for controlling the indicator light and displaying the running state; similarly, a phase line L21 of a control power supply is connected to the incoming line end of the first normally closed contact KA2-2 of the second relay; the outlet end of the first normally closed contact KA2-2 of the second relay is connected with the inlet ends of the third indicator light HG and the fourth indicator light 1 HG; the outlet ends of the third indicator light HG and the fourth indicator light 1HG are connected with a zero line N of the control power supply; for displaying the state when the circuit is stopped.
And the control power supplies L21 and N are connected into a power supply of the low-voltage line protection device FCU to provide power for the low-voltage line protection device FCU.
The circuit realizes the control of the low-voltage heater main circuit and the function of the circuit.
Respectively connecting a secondary side end of a current transformer TD and a zero line of the current transformer TD to an Ia end, an Ib end, an Ic end and an ln end of a low-voltage line protection device FCU; the Ua end and the Un end of the low-voltage line protection device are respectively connected with control power supplies L21 and N; a second normally open contact KA2-3 of a second relay is connected to the S2 end of the low-voltage line protection device FCU; a breaker tripping signal normally-open contact QF-1 of a breaker QF is connected to the S3 end of the low-voltage line protection device FCU; a breaker state signal normally open contact QF-2 of a breaker QF is connected to the S4 end of the low-voltage line protection device FCU; PROFI-BUS communication cables are connected to the end A of the low-voltage line protection device FCU and the end B of the low-voltage line protection device FCU, the PROFI-BUS communication cables are connected to the temperature controller TC, and the rest end points are suspended. The circuit is mainly characterized in that the low-voltage line protection device FCU accesses a current voltage signal and a breaker state signal and a tripping signal of the breaker QF and is used for monitoring the state of the breaker QF.
Referring to fig. 1, in this embodiment, the outlet end of the first terminal of the breaker QF and the inlet end of the second terminal of the breaker QF are shorted; and the wire outlet end of the first terminal of the contactor KM is in short circuit with the wire inlet end of the second terminal of the contactor KM. The main function is to improve the current-carrying capacity by using the terminal of the breaker QF and the terminal of the contactor KM.
In this embodiment, the low-voltage heater control circuit is a single-phase circuit. The breaker QF is a 3VA series breaker. The current transformer TD is a threading current transformer.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (7)
1. A low pressure heater control circuit, comprising:
one end of the circuit breaker is connected with a mains supply, and the other end of the circuit breaker is connected with a wire inlet end of the contactor; the outlet end of the breaker is connected to a control power supply;
the outlet end of the contactor is connected to the heater;
a current transformer is arranged on a circuit from the heater to the contactor;
and the heater control circuit is internally provided with a low-voltage line protection device for controlling the on-off of the contactor and controlling the heating of the heater.
2. The low-pressure heater control circuit according to claim 1, wherein the heater control circuit further comprises:
the first fuse is arranged on a phase line of the commercial power;
the second fuse is arranged on a phase line of the control power supply;
a test switch is arranged between the phase line of the mains supply and the phase line of the control power supply;
the phase line of the control power supply is respectively connected with the wire inlet end of the working signal of the high-voltage motor and the wire inlet end of the starting button;
the wire outlet end of the working signal of the high-voltage motor is connected with the wire inlet end of the first relay coil; the outlet end of the first relay coil is connected with a zero line;
the wire outlet end of the start button is connected with the wire inlet end of the stop button; a first normally open contact of the contactor is arranged on the starting button to form self-locking;
the wire outlet end of the stop button is connected with the wire inlet end of a first normally closed contact of the first relay, the wire outlet end of the first normally closed contact is connected with the wire inlet end of a normally closed contact of the temperature controller, and the wire outlet end of the normally closed contact of the temperature controller is connected with the wire inlet end of a coil of the circuit breaker and the wire inlet end of a coil of the second relay; the outlet end of the coil of the circuit breaker and the outlet end of the second relay coil are connected with a zero line of a control power supply;
the phase line of the control power supply is connected to the wire inlet end of a first normally open contact of the low-voltage line protection device, the wire outlet end of the first normally open contact of the low-voltage line protection device is connected with the wire inlet end of a circuit breaker coil, and the wire outlet end of the circuit breaker coil is connected with the zero line of the control power supply;
the phase line of the control power supply is connected to the wire inlet end of the first normally open contact of the second relay; the wire outlet end of the first normally open contact of the second relay is connected with the wire inlet ends of the first indicator light and the second indicator light; the wire outlet ends of the first indicator light and the second indicator light are connected with a zero line of a control power supply;
the phase line of the control power supply is connected to the wire inlet end of the first normally closed contact of the second relay; the wire outlet end of the first normally closed contact of the second relay is connected with the wire inlet ends of the third indicator light and the fourth indicator light; the wire outlet ends of the third indicator light and the fourth indicator light are connected with a zero line of a control power supply;
the control power supply is connected with the power supply of the low-voltage line protection device to provide power for the low-voltage line protection device.
3. The control circuit of the low-voltage heater according to claim 1, wherein a secondary side end of the current transformer and a zero line of the current transformer are respectively connected to an end Ia, an end Ib and an end Ic of the low-voltage line protection device; a Ua end and a Un end of the low-voltage line protection device are respectively connected with a control power supply; a second normally open contact of a second relay is connected to the end S2 of the low-voltage line protection device; a circuit breaker tripping signal normally-open contact of a circuit breaker is connected to the S3 end of the low-voltage line protection device; a breaker state signal normally open contact of a breaker is connected to the S4 end of the low-voltage line protection device; and PROFI-BUS communication cables are connected to the end A of the low-voltage line protection device and the end B of the low-voltage line protection device, the PROFI-BUS communication cables are connected to a temperature display, and the rest end points are suspended.
4. A low pressure heater control circuit as claimed in claim 1 wherein the outlet of the first terminal of the circuit breaker is shorted to the inlet of the second terminal of the circuit breaker; and the wire outlet end of the first terminal of the contactor is in short circuit with the wire inlet end of the second terminal of the contactor.
5. The lp heater control circuit of claim 1 wherein the lp heater control circuit is a single phase circuit.
6. A low pressure heater control circuit as claimed in claim 1 wherein the circuit breaker is a 3VA series circuit breaker.
7. The lp heater control circuit of claim 1, wherein the current transformer is a wire-through current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023003115.6U CN214125542U (en) | 2020-12-14 | 2020-12-14 | Low-voltage heater control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023003115.6U CN214125542U (en) | 2020-12-14 | 2020-12-14 | Low-voltage heater control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214125542U true CN214125542U (en) | 2021-09-03 |
Family
ID=77511141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023003115.6U Active CN214125542U (en) | 2020-12-14 | 2020-12-14 | Low-voltage heater control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214125542U (en) |
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2020
- 2020-12-14 CN CN202023003115.6U patent/CN214125542U/en active Active
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