1. Standardize current transformer: the top of the transformer verification is used as a standardizer, and the accuracy is usually more than two grades higher than that of the tested.
2. Load box: imitate the practice operation status of the tested transformer.
3. Transformer summary checker: measure the fault between the standardized transformer and the tested transformer, and flash the operating current.
4. Booster: Cooperate with the voltage regulator to match the inspection current of various needs. Its capacity and cost increase with the addition of current.
5. Voltage regulator: used for scheduling and checking the current, usually in the same operating table with maintenance and switching equipment, two voltage regulators are divided into coarse harmonic and fine adjustment to satisfy the fineness of scheduling. When the additional current is less than 2500A, it can be made with a combination of 10KVA universal voltage regulators, and the larger current must be made separately, usually requiring 30-60KVA.
(1) Chen said scheduling.
(2) Deactivate the line interval maintenance (phase and ground) and high-frequency locking maintenance on the bus.
(3) Disable the defective recorder.
(4) If the secondary switch is not successful, it should be dealt with in the section (area).
(5) It is forbidden to use the secondary side-by-side switch of the 220kV bus voltage transformer to put the positive and auxiliary voltage transformer secondary circuits side by side, so as to avoid widening the incident.
220kVI, II. female PT secondary side-by-side switch, normal operation should be disconnected, such as in the double bus wiring, only when the 220kV hot inverted bus, that is, the bus tie switch closed and changed to non-automatic, in order to avoid the voltage switching base relay to accept excessive unbalanced load, the PT secondary side-by-side switch to people, to complete the busbar, the bus tie switch to automatic, first separate the side-by-side switch.
When the DC fuse of 220kV and 110KV bus PT switching equipment is fused, the communication voltage of the general reclosing of the relevant line is not seen, the vibration locking action or the shortcomings of the interval maintenance equipment, and the communication voltage is not visible. The 220kV voltage transformer has two active air switches, and it is assumed that one of the air switches is out of phase or jumps off, which is reflected in the significant changes in the voltmeter, and should be checked and dealt with immediately.
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Introduction to the characteristics of Siemens APT ZY2 miniature relay
1. Various specifications, with indicator light, with manual test button, with surge suppression loop and other functions
2. Coil control voltage DC6V-220V, AC6V-240V (50/60HZ)
3. The rail type is equipped with a variety of adaptation sockets
4. LED indicator, DC is green, AC is red
...
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Siemens APT transformer - the use, principle and selection of current transformer
The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. Its primary side winding turns are very small, string in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is relatively large, and the series ...
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Siemens APT Relays – How to Choose Relays?
1. The type and series of relay selection
First of all, the type of relay is selected according to the work requirements of the object to be controlled or protected, and then the appropriate series is selected according to the sensitivity or accuracy requirements. When choosing a series, you should also pay attention to the compatibility of the relay with the system.
(1) ...
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Siemens APT current transformer - inspection content of current transformer
1. Regularly check whether the current transformer is overheated, check whether there is discoloration in the terminal, and check whether there are sundries in the terminal box.
2. Check whether there is oil leakage in the oil level gauge in time to ensure that the oil level meets the use standard and there is no oil leakage.
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Features of Siemens APT Relays – AC Relays
1. Since the current through the AC electromagnetic relay is a changing alternating current, the magnetic flux in the magnetic circuit also changes with the alternation (sinusoidal law instead of straight line law). The suction force of the armature is varied between 0 and the maximum, so the suction of the AC electromagnetic relay is pulsating, variing.
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Siemens APT Relays - the main product technical parameters of relays
(1) Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be either AC voltage or DC voltage.
(2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured by a multimeter.
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Siemens APT Relays – Common Causes of Failure of Solid State Relays
1. The reason for the frequent disconnection of the coil: whether the solid state relay is cleaned with ultrasonic, whether the coil is overvoltaged, etc., will cause the coil to be disconnected.
2. The reason for the insufficient power supply of the coil: First, it is necessary to confirm the voltage of the solid state relay coil. If the voltage supplied to the coil is lower than ...
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Siemens APT Relays – The difference between solid state relays and intermediate relays
First, the solid-state relay has no contacts and coils in the structure, which can be opened and closed at a high frequency and will not produce sparks, and has a long service life;
Second, the intermediate relay is generally only used for the control loop, and cannot work with load, and will make a "pop" sound when it is sucked in;
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Siemens APT Relays – an introduction to the new type of relay
The new relay refers to the electromagnetic relay developed and produced in order to meet the special requirements of the new and meet the use of special environmental conditions, its main characteristics are small size, light weight, vibration resistance, shock resistance, load range from low level load to 5A, 28 V rated load, product ...
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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 Limit Switches - Introduction to the types and characteristics of limit switches
Conventional domestic travel switch
LX19-001/111 in the LX19 series, LXK3-20S/T in the LXK3 series, JLXK1 series JLXK1-111/411/511 in the conventional travel switch are the most representative.
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Introduction to the advantages and disadvantages of Siemens APT relays - solid state relays
merit
1. High life, high reliability: solid state relay has no mechanical parts, the contact function is completed by solid devices, because there are no moving parts, so it can work in a high impact and vibration environment.
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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 Relays – a commonly used detection method for high and low voltage relays
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 the parameters of the relay, such as: ...
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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 – What are the functions of relays?
(1) Isolation between input and output circuits;
(2) signal conversion;
(3) Add output circuit;
(4) repetitive signal;
(5) Switch between different voltage or current loads;
(6) Retain the output signal;
(7) Locking circuit;
(8) Provide remote control
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Siemens APT Relays – Classified by relay form factor
(1) Miniature relay: the longest side of the relay is not more than 10 mm.
(2) Ultra-miniature relay: the longest side size is greater than 10 mm, but not more than 25 mm.
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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
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Siemens APT Relays - Installation Precautions for High and Low Voltage Relays
1. Choose the right relay: When choosing a high and low voltage relay, you should choose the right product according to your needs, such as selecting according to the rated voltage, current and other information
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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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