1. Visual inspection method: observe the appearance of the relay by the naked eye, check whether it is damaged or deformed, observe whether the contacts are tightly contacted, and whether there are copper slag and other substances attached to the contacts.
2. Parameter detection method: use test instruments to detect various parameters of the relay, such as: electrical parameters such as resistance, inductance, capacitance and other signal parameters of the relay, voltage and current. Among them, the resistance value should not be too large or too small, the inductance value should be close to the required range, and the capacitance value should not fluctuate greatly.
3. Joint detection method: comprehensively apply a variety of detection methods, such as visual inspection + parameter detection or parameter detection + functional testing, etc., to conduct a comprehensive inspection of high and low voltage relays. By simulating the actual use of the relay, such as voltage, temperature and other conditions, the working performance of the high and low voltage relay is tested to ensure its normal operation and long life.
The above three methods are commonly used high and low voltage relay detection methods, and special attention needs to be paid to safety during testing, and the appropriate testing instruments and test frequencies are selected to accurately judge the working state of the relay in order to improve work efficiency and create reliable electrical equipment.
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Siemens APT Relays – The working principle of zero-crossing AC solid state relays
1. Working process:
AC zero-crossing solid state relays have the characteristic of turning on when the voltage crosses zero and turns off when the load current crosses zero.
Circuit diagrams, dimensions and drawings of zero-crossing AC solid state relays
When the optocoupler OPT is turned off (i.e. there is no input signal at the control end of the OPT ...
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Siemens APT Relays – Functions of High Voltage Relays
1. Control switch: The high-voltage relay can open or close the high-voltage circuit to achieve the purpose of controlling the work of the equipment.
2. Protection circuit: The high-voltage relay can monitor the current, voltage, temperature and other parameters inside the high-voltage circuit, and automatically cut off the circuit when the circuit is abnormal.
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Siemens APT current transformer – precautions for current transformers
1. Before the installation of the open current transformer, it must be connected to the meter (or other measuring devices) for the second time to ensure that the transformer is not open for the second time;
2. Place all the open current transformers connected to the secondary line on the site and wait for installation;
3. If the on-site bus is electrical...
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Siemens APT Relays – Components of Solid State Relays
Solid state relays consist of three parts: the input circuit, the isolation (coupling), and the output circuit.
Input circuitry
According to the different categories of input voltage, the input circuit can be divided into three types: DC input circuit, AC input circuit and AC and DC input circuit. Some input control circuits are also ...
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Siemens APT relay - the use of solid state relay pay attention to five major matters
1. The resistive load should not exceed 60% of the rated current;
2. Overcurrent and load short circuit may cause permanent failure of the internal thyristor in SSR, so it is necessary to install a fuse or air switch, and a fuse can be used if the capacity is small;
3、 ...
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Siemens APT Pushbutton Switches – How Many Types of Pushbutton Switches Are There?
There are several types of pushbutton switches:
Pushbutton switches can be classified according to the way they are protected and how they are operated. It can be divided into open type and protected type, as well as waterproof type and anti-corrosion type, etc. And explosion-proof, knob-type, key-type, emergency-type, are also its ...
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Siemens APT current transformer – current transformer operating error
When the current transformer is finalized and its internal parameters are determined, the magnitude of the error will be affected by the secondary current (or primary current), secondary load, power factor, and frequency. These factors are called external factors, and the error of the current transformer in operation is mainly affected by these four factors.
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Siemens APT - ALH-0.66 series transformer FAQ
1. What is the maximum voltage that can be used for an ALH transformer?
AC low voltage up to 720V
2. Is there a protective grade product for ALH transformers?
II-P AND III-P are available in both protective grades
3. What is the maximum primary current of ALH transformer?
The maximum primary side current is 8 ...
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Siemens APT Relays – Reliability of Relays
1. The influence of the environment on the reliability of the relay: the average time between failures of the relay is the highest under GB and SF, reaching 820,000h, while in the NU environment, it is only 60,000h.
2. The influence of quality grade on the reliability of relays: when the relay of A1 quality grade is selected, the flat ...
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Siemens APT current transformer - introduction to the classification of current transformers
Categorized by use
According to different uses, current transformers can be roughly divided into two categories:
Current transformer for measurement (or measurement winding of current transformer): provides current information of the power grid to measurement, metering and other devices within the normal working current range.
Protecting Electricity ...
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Introduction to the features of the full range of Siemens APT metal button FM products
Seeking advanced, perfect and excellent Xijia APT to concentrate on research and development, and constantly change customs, the launch of the metal flat button indicator FM series is to complete the perfect integration of appearance and performance.
Ultra-thin flat round device, metal shell and buttons, high-value appearance
Product ...
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Introduction to the characteristics of Siemens APT relays - solid state relays
Solid state relay is a non-contact electronic switch with isolation function, no mechanical contact parts in the switching process, so in addition to having the same function as electromagnetic relay, solid state relay also has logic circuit compatibility, vibration resistance and mechanical impact resistance, unlimited installation position, and good anti-...
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Siemens APT relay - the main structural features of high and low voltage relays
1. Electromagnet: The electromagnet of high and low voltage relay is usually composed of two parts: coil and core. When the high and low voltage relay inputs the electrical signal, the electromagnet coil will generate electromagnetic force, drive the iron core, and realize the on/off control of the relay.
2. Contact group: The contact group is a high and low voltage relay control ...
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Siemens APT Relays - Maintenance Methods for Solid State Relays
1. The influence of the ambient temperature
The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, during the use of the device, it should be ensured that it has good heat dissipation conditions, the rated working current of more than 10A products should be equipped with radiators, and the products above 100A should be dissipated.
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Siemens APT Relays – the working principle and function of relays
How relays work
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Siemens APT - LW39 series 10,000 revolutions FAQ
1. What are the current specifications of universal transfer switches?
At present, there are four forms: 10A, 16A, 25A, and 63A
2. What are the positioning angles of the universal transfer switch?
At present, it is divided into four angles: 30°, 45°, 60° and 90°
3. There is no customer's ...
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Siemens APT Relays – What should I pay attention to when selecting relays?
1. When selecting a relay, it is necessary to understand the load and type of its contact, because the contact method of the relay of the same model is different, with multiple groups of contacts and single group contacts. When selecting a relay, you can choose the type of contact.
2. And in the peach ...
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Siemens APT - x.R series relays frequently asked questions
1. Does the AC control relay have surge suppression?
SR/NR/PR can produce AC with surge suppression circuits
2. How many types of thermal current specifications are there for our company's relays?
3A, 5A, 8A, 10A, 12A five current specifications
3. Surge suppression back ...
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Siemens APT current transformers – precautions for the use of current transformers
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Siemens APT current transformer – the difference between the ratio on a current transformer and the ratio on a watt-hour meter
1. Differences in use
The conversion ratio of the current transformer is inconsistent with the transformation ratio of the ammeter, which will lead to the inability to use the displayed value of the ammeter directly, and the proportional conversion must be carried out;
If the transformer of ratio 5 is used on the meter of ratio 1, the secondary current of CT will generally exceed 1A, so that the transformer of 5 is used on a meter of 1 ratio. Than 1 ...
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