Circuit Principle and Practical Application of Trip Circuit for High Voltage Circuit Breaker
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1 The function of the anti-trip circuit a1 Prevents the closing of the control switch or the automatic device's closing contact from failing to return in time (for example, the operator does not release the handle and the closing contact of the automatic device sticks) and just closes the fault line and equipment. Causes the circuit breaker to cut continuously.
B1 also has an important function for the current-starting and voltage-maintaining electrical anti-trip circuit. It is to prevent improper adjustment of the auxiliary contact of the circuit breaker due to the trip circuit (transition is too slow), resulting in the phenomenon that the protection outlet contact is broken and then burned. This phenomenon is not tolerable for microcomputer protection devices, and this is often overlooked.
2 typical connection of anti-jump circuit
Common anti-trip circuits are tandem type anti-trip circuits, parallel type anti-trip circuits, spring energy storage type anti-jump circuits, and trip coil auxiliary contact type anti-jump circuits. Domestic circuit breakers mostly adopt tandem type anti-trip circuit breakers and more parallel-type anti-trip circuits. Among them, the tandem type anti-jump circuit is the most reasonable and the most widely used. In addition to the anti-jump function, it also has the advantage of preventing the arc outlet contacts from being broken and burned. This is also an indispensable technical condition for the application of the microcomputer protection device. Other anti-trip circuits only have the function of preventing the circuit breaker from jumping. When the trip coil auxiliary contact type anti-trip circuit performs the anti-trip function, the trip coil may be burned for a long time.
2.1 In-line anti-trip circuit The so-called tandem type anti-trip, that is, the anti-trip relay TBJ is started by the current, and the coil is connected in series in the trip circuit of the circuit breaker. The voltage holding coil is connected in parallel with the closing coil of the circuit breaker. When it closes to the fault line or equipment, the relay protection action and the protection outlet contact TJ are closed. At this time, the current coil of the anti-trip relay TBJ starts and the circuit breaker trips. The normally closed contact of TBJ disconnects the closing circuit. A pair of normally open contacts turns on the voltage coil and holds it. If the SK(5-8) or HJ contact cannot continue to send the closing command at this time, the circuit breaker cannot be closed because the closing circuit has been disconnected, thereby achieving the anti-jump purpose. In addition, when the TBJ is started, its normally open contact connected in parallel with the protection outlet is closed and is self-protected until the auxiliary terminal of the circuit breaker is always opened to “displaceâ€, thereby effectively preventing the arcing of the protection outlet contact. Tandem type anti-skipping circuit, as shown in Figure 1.
2.2 Parallel type anti-trip circuit The so-called parallel type anti-jump, that is, the voltage coil of the anti-trip relay KO is connected in parallel to the closing circuit of the circuit breaker (as shown in Figure 2). For example, when a permanent closing command exists, the output of the closing rectifier bridge is switched on via Y3, S2, S3, S1, KO (2-1). After the circuit breaker is closed, the auxiliary contact S3′ connected in parallel with the closing circuit is closed, and the anti-trip relay KO is activated. The KO contact point is switched from position 2-1 to position 4-1, and the closing circuit is opened and maintained. If the line or equipment fails, relay protection trips. However, since the closing circuit has been reliably disconnected, the switch jump is prevented.
2.3 spring energy-type anti-jump circuit Figure 3, when a long-lasting closing command arrives, the closing current is switched on or off by S3, K1, K1, S2, S1, YA1 via SK or HJ. After the closing, the spring mechanism starts to store energy. The normally-closed point of the spring-loaded auxiliary switch S3 of the closing circuit is connected to the normally-opened point of the jump-proof relay K1 and K1. The normally closed point opens the closing circuit. If the line or equipment fails at this time, the relay protection action trips, because the closing circuit has been reliably disconnected, effectively preventing the switch from jumping.
2.4 Trip Coil Auxiliary Contact Type Anti-trip Circuit As shown in Figure 4, when a short-circuit fault occurs during the closing process, the protection device trips the circuit breaker, and the normally open auxiliary contact TQ2 operated by the tripping coil closes to keep the tripping coil powered on. . The normally closed auxiliary contact TQ1 of the trip coil is opened, and the closing circuit is cut off. If the closing command continues to exist, the circuit breaker will not be closed again. After the closing command is released, the trip coil is de-energized and the wiring returns to its original state.
3 Issues to be noted during application a1 Circuit breakers without anti-jumping devices shall be equipped with an electrical anti-trip circuit. The tandem anti-skid circuit has the best performance and should be used with priority. It can receive the effect of killing two birds with one stone.
The starting current coil of b1 tandem type anti-trip relay should be no less than 2 selection type according to sensitivity, and the polarity of current coil and voltage coil should be consistent when installing.
C1 When both the protection device and the switch operating mechanism have an electrical anti-trip circuit, it is recommended to use the anti-trip circuit inside the protection device, and to remove the anti-jump circuit in the operating mechanism, which is reliable and easy to maintain.
D1 For the spring energy storage type operating mechanism, some people think that the energy storage mechanism itself has a function of anti-jump, it does not seem necessary to add electrical anti-skipping circuit. However, the energy storage mechanism does not prevent the switching jump caused by the closing of the closing contact, and does not prevent the function of protecting the outlet contacts from arc burning. Therefore, it is still better to install an electrical anti-skid circuit.
Product Overview <br> <br> With the development of society, people's safety and reliability of the electricity requirements of increasingly high, high voltage circuit breakers have the dual mission control and protection in the power system, its performance will directly It is related to the safe operation of the power system. The mechanical characteristic parameter is one of the important parameters for judging the performance of the circuit breaker.
TPGKC-G high-voltage switch mechanical characteristic tester is Tuopu Electric's latest "High Voltage AC Circuit Breaker" GB1984-2003 design basis, refer to the power industry standard "General technical conditions for high voltage test equipment," Part 3, DL/T846. The 3-2004 high-voltage switch tester is designed for R&D and production. To facilitate the dynamic analysis of various types of circuit breakers, the high-voltage switch mechanical characteristics tester can accurately measure the mechanical dynamic parameters of low voltage, high oil, vacuum, and sulfur hexafluoride of various voltage levels.
Definitions of terms 1. The time between the closing and closing moments from the moment when the closing command is received and the moment when all pole contacts are contacted (separated).
2. The maximum time difference between the contact (separation) moments between the breaks and the fractures at the same time.
3. Time during which the moving contact and the static contact of the bouncing time switch are closed (separated) from the first closing (separation) operation to the final closing (separation).
4, action time (contact operation time)
The time from the moment of receiving the (partial) brake command to the instant when the contact is just moved.
5. The number of times that the movable contact and the static contact are separated (closed) during the operation of the split (close) brake.
6. Bounce Amplitude Switch The maximum rebound value of the moving contact during the movement of the moving contact.
7. When the stroke is divided and closed, the distance from the start position of the movable contact of the switch to any position is set.
8. When opening the sub-position, the total gap between the contacts of the switch pole or any conductive part of the connection.
9. In the over-travel closing operation, the moving contact distance after the contact of the switch contact is continued.
10. In the over-travel and closing operations, the distance between the maximum stroke and the stabilized stroke during the movement of the moving contact of the switch.
11, rigid (sub) speed switch in the (sub) gate in the process of moving contact with the static contact contact (separation) instantaneous speed of movement.
12, the average speed switch (partial) brake operation, the moving contact in the entire course of the journey and the ratio of time.
13, gold short-time operation in the split-minute operation, from the moment of contact of all poles to the subsequent sub-operation when the arc contacts in all polar moments are separated.
Technical parameters <br> <br> environmental groups: Group genus GB6587.1-1986 Ш instrument "master environmental testing electronic measuring instruments" in the operating power supply: AC220V ± 10% Frequency: 50Hz ± 5%
Ambient temperature: -10°C~40°C Relative humidity: ≤85%
Insulation resistance: ≤ 2MΩ
Dielectric strength: The power input line can withstand 1.5KV 1 minute withstand voltage test for the case.
Time Test Range: 1~499.9ms Resolution: 0.01ms Accuracy ≤ 0.1ms
Stroke Test Range: Unlimited Resolution: 0.01mm Accuracy ± 1% Reading + 2 words Speed ​​Test Range: 15m/s Resolution: 0.01m/s Accuracy ± 1% Reading + 2 words DC Power Selection Range: 25- 265V/10A Resolution: 1V Accuracy ≤±1%
Host size, weight: 440 × 300 × 150 (mm) 5 (kg)
Attachment size, weight: 440 × 300 × 80 (mm) 3 (kg)
The application:
1. Lighting and decorative lighting
2. Solar reflector
3. Architectural appearance
4. Interior deoration: ceiling, building wall,roofing,photo frame and so on.
5. Furniture,cabinet
6. Elevator
7. Label,nameplate,luggage
8. Decoration of the inside and outside of car
9. Domestic appliance such as freidge, microwave and so on
10. Aerospace and military applications such as aircraft manufacturing, spacecraft manufacturing, artificial satellite and so on.
3003 3004 3005 3105 have excellent rust-proof capability.The basis content is Manganese element.This alloy is widly used in humid environment. Such as freigde,air conditioner and vehicle bottom. 3000 series price is higher than 1000 series.
5005 5052 5754 have low density and they have high tensile strength.and high elongation.They are widly used in aircraft tank and other oxidation deep processing.
8011 is the most common alloy used as cap material.And also used as radiator material. This alloy is used mostly as foil.