How to draw a relay
As an important component in electrical control, relays are widely used in automation, power systems and other fields. This article will combine the hot technical topics on the Internet in the past 10 days, explain in detail the drawing method of relays, and provide structured data for easy understanding.
1. Basic structure and symbols of relays
Relays are mainly composed of coils, contacts, armature and other components. Its electrical symbol is divided into two parts: coil and contacts:
| parts | graphic symbols | Description |
|---|---|---|
| Coil | Add slash inside rectangular frame | Indicates the electromagnet part |
| Normally open contact | Two parallel lines are broken | Disconnected state when not powered |
| Normally closed contact | Two parallel lines connect | Closed state when not powered |
2. Steps to draw a relay
1.Determine type: Select electromagnetic relay, solid state relay or time relay according to the usage scenario.
2.draw coil: Use a rectangle to represent the coil body, and add slashes or wavy lines inside to represent the windings.
3.Add touch points: Draw normally open/normally closed contacts according to circuit requirements, paying attention to the linkage relationship between contacts and coils.
4.Annotation parameters: Including key parameters such as coil voltage and contact capacity.
| Parameter type | Example value | mark location |
|---|---|---|
| coil voltage | DC12V | Next to the coil symbol |
| Contact capacity | 10A/250VAC | Next to the contact symbol |
| Model | JQX-13F | below the graph |
3. Popular relay technology trends (last 10 days)
According to network data analysis, the current hot spots in the field of relays are concentrated in the following aspects:
| hotspot direction | Discussion popularity | Typical applications |
|---|---|---|
| solid state relay | ★★★★★ | Photovoltaic inverter |
| Smart relay | ★★★★☆ | IoT control |
| Micro relay | ★★★☆☆ | wearable devices |
4. Common drawing errors and corrections
1.Wrong direction of coil: Make sure the coil symbol direction is consistent with the current direction.
2.Contact status confusion: Normally open/normally closed contacts should be clearly marked to avoid circuit design errors.
3.Parameter missing: Important electrical parameters must be fully marked.
5. Relay selection reference data
| Model | coil voltage | Contact capacity | Lifespan (times) |
|---|---|---|---|
| JZC-32F | DC12V | 10A/250VAC | 100,000 |
| HH52P | AC220V | 8A/250VAC | 50,000 |
| G5Q-1A4 | DC24V | 5A/30VDC | 200,000 |
6. Relay circuit diagram drawing skills
1.Modular drawing: Draw the coil and contacts separately, and use dotted lines to represent mechanical linkage.
2.Contact number: Multiple sets of contacts should be numbered accordingly, such as K1-1, K1-2, etc.
3.status annotation: Mark the initial state of the relay in a complex circuit.
Through the above structured data and detailed instructions, I believe you have mastered the drawing methods and precautions for relays. In practical applications, adjustments need to be made based on specific circuit requirements.
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