Liquid Resistance Starter for Winding Asynchronous Motors

• Customization: Available
• Certification: ISO9001, CCC, Type Test
• Protection: IP20
• Model NO.: SZYQ
• Installation: Vertical
• Housing: Aluminum Zinc
• Motor Rated Power: 315-4000kw(Customizable)
• Transport Package: Plywood
• Specification: 0.38-10kV
• Trademark: Sanhe
• Origin: China
• HS Code: 8537209000
• Production Capacity: 10000PCS\Year

Product Description

1. Product Overview

SZYQ series liquid resistance starting device is a new generation of starting control device successfully developed to further improve the starting performance of large and medium-sized winding asynchronous motors. By inserting a liquid resistance in series into the rotor circuit of the controlled motor, it automatically starts when the motor starts. It is put in and automatically, steplessly and continuously cut off within a predetermined time, overcoming the large impact current of old-fashioned starting control equipment such as frequency-sensitive rheostat, oil-immersed rheostat, cast iron resistor (generally about 3 to 5 times the rated current), starting It allows the motor to start smoothly and increase speed evenly under ideal starting current conditions, which has significant effects on protecting the motor, electrical equipment, power grid and energy saving. This equipment is carefully designed in terms of starting, stopping, fault protection, contact, alarm, display, etc. Compared with other old-fashioned starters, it has a high degree of automation, small starting current (generally less than or equal to 1.3 times the rated current), electrical It has the characteristics of small mechanical impact and is particularly suitable for heavy-load starting. It can start smoothly even with low grid voltage, which reduces the capacity of the transformer. It is currently the most ideal for heavy loads such as ball mills, elevators, crushers, compressors, fans, and water pumps. starter control equipment.

2. Performance characteristics

1. The performance is far superior to starters such as frequency-sensitive varistors, oil-immersed varistors, and cast iron resistors.
2. The starting current is small, less than or equal to 1.3 times the rated current of the motor.
3. Can start continuously 5 to 10 times.
4. Smooth start: No mechanical stress impact on the equipment, which can extend the life of mechanical equipment and motors.
5. Low voltage starting is possible: the machine can still start when the voltage drop is within 10% of the rated voltage.
6. Simple and reliable structure, all operations are automated, and installation and maintenance are easy.

3. Usage Environment

1. Ambient temperature: -10ºC ~ 40ºC;
2. Relative humidity: <85%, no condensation;
3. Altitude: <2000m, special design is required above 2000m;
4. Installation location: The vertical inclination shall not exceed 5°, there shall be no severe vibration, and there shall be no gas and dust that may corrode metal or damage insulation.

4. Product Model

Not applicable

5. Technical parameters

1. Controlled motor power: 45~10000kW.
2. Controlled motor rotor current: 200~2000A.
3. Controlled motor rotor voltage: 200~3000V.
4. Normal operating temperature of electro-hydraulic: 0~65ºC.
5. Continuous starting times: 5 to 10 times.
6. Starting current: Iq ≤ 1.3Ie (Ie is the rated current of the motor).
7. Power supply voltage: three-phase AC380V, 50/60Hz

Product Specifications	Motor power (kW)	Start time (s)	Starting temperature rise (ºC/time)
SZYQ - 200 /	≤200	15~20	5
SZYQ - 400 /	≤400		5
SZYQ - 600 /	≤600	15~30	5
SZYQ -1000 /	≤1000		5
SZYQ -2000 /	≤2000	20~40	8
SZYQ -3000 /	≤3000		10
SZYQ -4000 /	≤4000	25~50	10
SZYQ -5000 /	≤5000		10
SZYQ -   /	>5000	Special design according to technical requirements

6. Working Principle

The SZYQ series liquid resistance starting control device uses a special medium aqueous solution as a resistor. In a specially designed liquid resistance box, a plate is introduced as an electrode and connected in series to the motor rotor circuit. When the motor starts, a small power servo motor drives the plate to move to change the relative distance of the plate, so that the liquid resistance (connected in series to the rotor circuit) changes steplessly from large to small, thereby achieving smooth starting of the motor.

7. Installation and debugging

Install
1. The electric cabinet should be installed on a water-drainable cement foundation, ensuring that the electric cabinet is vertical to the horizontal plane, the cabinet body is fastened to the channel steel on the foundation, and there should be a cable trench under the electric cabinet.
2. According to the electrical schematic diagram, introduce the motor rotor cable (the cable can carry enough current) into the electrical cabinet and connect it. At the same time, connect the control power line and control interlock line. For details, see the wiring instructions below.
3. Check whether the wiring is correct and whether the fasteners are loose.
4. Check the insulation resistance of the liquid resistor plate to ground, which should be ≥5MΩ.
Wiring Instructions:
Motor rotor cable specification selection:
The rated voltage and rated current of the cable selected for the motor rotor should be greater than the rated open-circuit voltage and rated current of the motor rotor.
Motor rotor cable position selection:
Connect the motor rotor slip ring terminal to the primary cable reserved terminal of the outgoing busbar at the rear of the cabinet.
Motor control power line specification selection:
Three-phase four-wire (3P+N) sheathed cable, rated voltage AC380V, frequency 50/60Hz, copper core, wire diameter ^≥2.5mm2 .
Motor control power line location selection:
The control power supply is derived from a dedicated power distribution circuit of the low-voltage distribution cabinet inside the system and has a short-circuit protection function. The switch capacity is: 3P/16A and is connected to the terminal block L1/L2/L3/N of this cabinet.
Motor control interlock wire specification selection:
The connected control signals are divided into three groups: ready signal, fault signal, and drive signal. Each group has 2 wires, a total of 6 wires, copper core, wire diameter ≥ 1.0mm2 ^. The specific interlocking conditions of the three groups of signals are as follows:
Ready signal: output from the starting cabinet, terminals 211 and 213 of the starting cabinet are connected in series to the closing circuit of the high-voltage cabinet.
Fault signal: starting cabinet output, starting cabinet terminals 221 and 223 are connected in parallel to the high-voltage cabinet tripping circuit.
Driving signal: high-voltage cabinet output, the normally open passive auxiliary contacts of the high-voltage vacuum circuit breaker of the high-voltage cabinet are connected to the starting cabinets 103 and 113.
Selection of motor control interlock line position: connect from the wiring terminals of the high-voltage switch cabinet that controls the motor to the wiring terminals of this cabinet.
debug
Connect the motor rotor line, control power line, and control signal line according to the above requirements, and then power on and debug after checking that the wiring is correct and fully tightened. First, conduct a single machine inspection, and then conduct a linkage test run. When inspecting a single machine, check the phase sequence of the control power supply of the starter cabinet. In the shutdown state, the starter cabinet plate should automatically reset (plate upward). If the plate is downward, it means that the phase sequence is reversed. You can swap any two phases of the three phases ABC of the control power supply. After the phase sequence is confirmed to be correct, turn the switch on the panel to the test position, wait until the equipment is in the ready state, the panel "ready indication" light is on, observe the operation of the equipment, press the start button, the plate goes down, the panel "start indication" light is on, the plate goes down and reaches the lower limit after about 30 seconds, the internal rotor short-circuit contactor is energized, and the panel "run indication" light is on, the start is complete, press the stop button, the plate goes up, the panel "reset indication" light is on, the rotor short-circuit contactor is disconnected after about 2 seconds, the plate goes up and reaches the upper limit after about 30 seconds, the panel "ready indication" light is on, and the equipment is in a static state. After the single machine debugging is completed, turn the panel switch to the working position for linkage test, that is, test the interlocking action of the high-voltage cabinet and the starting cabinet without passing high voltage to the motor: after the high-voltage cabinet is closed, the starting cabinet automatically starts, and after the high-voltage cabinet is opened, the starting cabinet automatically resets, and artificially simulates the ready and fault signal actions to check the interlocking reaction. The temperature controller has been set at the factory and does not need to be adjusted. After all electrical functions are debugged, proceed to the next step: liquid preparation.
Preparation of electrolyte
Preparation scheme: Prepare the liquid according to the resistance in the motor rotor circuit;
Water for preparing liquid: distilled water is the best choice, softened water can also be used, at least it should be domestic water that has been cleaned and the sediment removed, and the amount should be slightly more than what is needed in the resistor box by 10-30%.
The resistor solvent, i.e. the resistor powder, is basically provided by our company at twice the demand.
Determination of liquid starting resistance R0 _:
 

Where: U _2e : open circuit voltage of motor rotor circuit (V)I _2e : Rated current of motor rotor circuit (A)
K _F : Motor power margin multiple. If the actual operating value I _{1 of the motor's stator current is known} , we can take :
Where I _1e is the rated current of the motor stator. If it is a new equipment that has not yet been put into production and I _{1 is unknown} , you can use , where Ne is the rated power of the motor and N ₁ is the required power of the load.
     kt : Temperature multiple. If the temperature of the prepared solution is around 30°C, then Kt≈1.2 _.
     k _M :Starting torque multiple, that is , M _Q is the starting torque of the motor during the starting process, Me is the rated torque of the motor. For general full-load starting mechanical equipment, such as ball mills, K _{M = 1.1~1.3, and} it is generally recommended to take 1.1. If the power grid capacity is large enough and the load torque is too large, 1.3 can be taken.

1. Resistor preparation:

• First, place the moving plate in the starting position (i.e. the upper limit position), and inject the prepared water to about 2/3 of the specified position of the water tank. Note that the liquid levels of the three compartments should be basically equal;
• Weigh a certain amount of electrolyte powder (refer to Appendix 1 for the amount of electrolyte powder to be weighed);
• First, pour the prepared water into a container such as a basin or bucket. The water should not exceed 2/3 of the container volume. Take 1/3 of the electrolyte powder and slowly pour it into the container and stir it continuously until the electrolyte powder is completely dissolved. Then pour it into one phase of the resistor box. Some of the lumps that cannot be dissolved are dissolved with hot water. If there is still a small amount of insoluble matter, it can be discarded. If there is too much electrolyte powder and the container volume is too small, it can be dissolved in several times;
• Repeat step to dissolve the electrolyte powder into the other two phases;
• Add water to the liquid resistance box to the required liquid level (the liquid level is about 60mm from the upper cover of the resistance box);
• Push the test button to move the plate up and down two or three times to stir the resistor liquid in the box evenly.
• Use a clean cloth to wipe off any water stains on the outside of the resistor box.
• Measurement of liquid resistance

Untie the motor rotor connection cable, move the active plate of the liquid resistor to the starting position, and pass 60Hz electricity between the active and static plates of each phase through the autotransformer. The current gradually increases from 0 to about 5A. The current I _(A) records the reading of the ammeter A and measures the voltage drop V _{(V) between the two poles. The} measured liquid resistance value is: The measurement circuit is as follows:

In the figure, FU: fuse 2A A: AC ammeter 5A, level 0.5; B: voltage regulator 5KVA; V: AC voltmeter level 0.5. The measured R value should be close to the calculated value of R0 _, with an allowable error of 5%.
If the resistance is too large, the concentration of the resistance liquid should be increased, otherwise the concentration should be reduced. The adjustment method is to use a hose to extract part of the solution and add water or electrolytic powder. Note: When measuring resistance, the moving plate must be at the upper limit, and the rotor circuit is disconnected from the resistance box; The resistance liquid should be stirred evenly before measuring; The phase line and neutral line of the voltage regulator cannot be connected in reverse.
After the liquid resistance configuration is completed, the cabinet should be cleaned inside and outside, especially the cover and side walls of the electrolyte tank, to remove residual electrolyte and stains. After cleaning, proceed to the next step: formal test run.
Formal test run
After completing the above steps, and confirming that the wiring of the motor and the circuit is correct and the insulation inspection meets the relevant standards, the motor can be formally tested with high voltage. Under load (normal load), observe the starting current of the motor, which should be about 1.3 times the rated current of the motor. If starting is difficult, or there is a certain impact current at the end of starting, measures can be taken to appropriately increase the electrolyte concentration (add electrolyte powder to increase the concentration), which can increase the starting torque of the motor and speed up the starting speed.
Requirements for setting protection values of high voltage switchgear
This product promises that the motor starting current is less than or equal to 1.3 times the rated current of the motor. This value is the average starting current. Due to the motor starting characteristics and load relationship, there may be a small impact current at a certain stage of the starting process. In order to ensure smooth starting, the current protection setting and action time of the motor power cabinet, i.e. the high-voltage switch cabinet, should cover the starting process.
Note: The quick-break is generally set according to the short-circuit current of the motor (5 to 8 times the rated current). The specific setting value should comply with the power system relay protection specifications, and consider the relevant requirements of the local power supply management department, as well as the actual grid capacity.

8. Use and Maintenance

If the "power indicator" light is on, but the "ready indicator" light is off, check whether the liquid level or temperature is normal. Check whether the travel switch and contactor are in action, and whether the lifting frame is in place. Start only when the "ready indicator" light is on.
When you need to shut down for any reason, just press the main stop switch. Never cut off the starter power supply when the main motor is running.
After the factory power outage for overhaul, before starting the machine, it is necessary to perform no-load tests such as starting and running of the starter without starting the main motor. The starter can be put into use only after confirming that everything is normal. Under normal circumstances, the starter control cabinet will automatically shut down when a fault occurs, so it can be repaired in real time. However, it should be noted that it is necessary to regularly (half a year) check whether the travel switch is normal, and regularly (usually half a year) check whether the resistance liquid level of the starter cabinet is normal. If the liquid level is too low (below 50cm below the cover plate), resistance liquid or water should be added in time. When adding water and resistance liquid, pay attention to prevent liquid droplets from splashing to avoid damaging the insulation. Replace the resistance liquid regularly (4 to 5 years), and clean the plates and insulating box at the same time. You can use dilute hydrochloric acid to remove the oxides on the plates, rinse with clean water, wash the box with clean water and dry it, and then apply PVC anti-corrosion glue on the surface several times. Generally, the box should not be disassembled for cleaning.
If it is found that the main motor running current is too small, or the starter is normal during the no-load test, but the liquid temperature is too high during starting (above 60°C), check whether the KM1 contacts are burned out or have poor contact, and repair them in time. If the starting current is too large, the liquid resistance value becomes smaller, and clean water should be added.

9. Ordering Instructions

Please provide the following data when ordering:
1. Motor model, rated power, stator voltage, stator current, rotor voltage, rotor current;
2. Load characteristics of the motor;
3. If you have special requirements, please negotiate with our company.

10. Appendix

Liquid resistor ratio for winding motor

model weight Resistance (Ω) (kg)	SZYQ -200	SZYQ -400	SZYQ-600	SZYQ-1000	SZYQ-2000	SZYQ-3000	SZYQ-4000
0.3	2.0	3.5	5.5	8.5	13.5	27.5	45.0
0.4	1.75	3.25	5.25	8.0	12.8	20.5	35.0
0.5	1.5	3.0	5.0	7.5	12.0	16.5	28.5
0.6	1.25	2.75	4.5	7.0	11.5	13.5	23.5
0.7	1.0	2.5	4.0	6.5	9.5	11.5	20.0
0.8	0.75	2.0	3.75	6.0	8.50	10.5	17.5
0.9	0.5	1.5	3.0	5.5	8.00	9.5	15.5
1.0	0.45	1.25	2.75	5.0	7.50	8.5	14.0
1.1	0.4	1.0	2.5	4.5	7.0	7.5	12.5
1.2	0.35	0.7	2.3	4.0	6.5	7.0	11.5
1.3	0.3	0.6	2.0	3.5	6.0	6.5	10.5
1.4	0.2	0.5	1.8	3.0	5.50	6.0	10.0
1.5	0.2	0.45	1.5	2.5	5.00	5.5	9.5
1.6				2.0	4.5	5.25	9.0
1.7					4.0	5.0	8.5
1.8					3.5	4.5	8.0
1.9					3.0	4.0	7.5
2.0					2.5	3.5	7.0

FAQ

Company Profile

Founded in 2002, Sanhe Power Tech is a national high-tech enterprise that specializes in power quality products, R&D of technology and solutions, production,service etc. It becomes industry-leading company.
The company has got multiple technologies including.
28 invention patents,
24 software copyrights,
22 national standards and 15 industry standards drafting.
Sanhe Power Tech is a member of international committees such as
the International Electrotechnical Commission (IEC)
the Institute of Electrical and Electronics Engineers (IEEE) etc.
The software development system has passed the CMMI evaluation of the American SEI.
There are three main business covering:
A full range of power quality testing and governance products and complete solutions.
Distributed new energy system products and advanced solutions.
Primary and secondary engineering based on "dual carbon" and energy management with standardized and professional engineering services.

Our Advantages

Simulation of GRID Reactive Load Flow
Analysis of L-C Circuit Amplitude-frequency Characteristic
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PWM Technology
Technology about Semiconductor Forced Commutation
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Feed-forward Second-order Complex Vector Algorithm
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VP Scheduling & Dispatcher
Digital Twins of Micro-Grid & Islanding-Grid

What kind of payment terms can we accept?

Payment in advance,Installment payments,Letter of credit(L/C).
 

What is the lead time of products?

According to different products, the lead time is different.
For standard products like APF,SVG, the lead time is one week.
For customized capacitor bank etc,  the lead time is 25 to 45 days.
 

How to find the product model if you are some demand?

If you need our technical guide,please advise your problem details as much as you can,we can give more reasonable solution.
You may provide following drawings or report
Single line drawing
Panel primary scheme drawing
Power quality test report(mainly about harmonics)
 

How to find the product model if you have details electrical drawings?

Please advise Load name plate, load working condition, existing power factor, target power factor, harmonic times etc Or Rated voltage,compensation capacity, harmonic times(reactor detuning factor), other components etc.
 

How to find the product model if you can not provide enough information?

We can supply your products according to your technical requirement.
We can go to your project site and give a professional test report after test.
 

Why do we choose Sanhe power quality solution?

Sanhe has specialized in over 20 years experience in power quality products and solution. We have met most of power quality problems and gave the solutions.

What kind of technical service does Sanhe provide?

• Project-site power quality test ( or test report from customer)
• Improvement solution and budget
• Product solution and price
• Products supply
• Product commissioning

What kinds of standards does Sanhe product conform to?

Except China standards, Sanhe products also conform to IEC standards including
IEC61921 :2003 IEC61000-4-5:2005
IEC60529:2001 IEC60931-1: 1996
IEC60439-1 :2005 IEC60664-1 2007
IEC60831-1: 1996 IEC61000-4-3/2/4/5/18 IEC61000-2-4
IEC60255 IEC62208 2011…
IEC255-22-1

What is the compensation effect after using Sanhe products?
• Harmonic filtering meets standard
• Power factor is over 0.95,electrical bill saving,low reactive power penalty killing
• Reducing the loss of transformer and line
improve the distribution ability,
prolong the lifespan of electrical equipment

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Usually,the guarantee time is one year. However,we can accept over 5 years too. Please contact our sales to get details information.

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