Low Voltage Switchboard

Name: Low Voltage Switchboard
Brand: Fengyuan Power
SKU: 129858707

The low-voltage draw out type switch cabinet is suitable for the power generation and supply system with three-phase AC frequency of 50Hz, rated working voltage of 380V and rated current of 4000A and below, which is used for power, distribution, motor centralized control and capacitance compensation. It is widely used in power plants, petroleum, chemical industry, metallurgy, textile, high-rise buildings and other places. The product conforms to iec60439, gb7251.1, JB / t9661 and other standards

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Description

Operating environment:

1)Ambient temperature:-10°C-+40°C;

2)Altitude: high voltage ≤1000Meter, low voltage ≤2500Meter (technical department will design specially if exceeds);

3)Relative humidity:≤85%

4)Seismic intensity:≤ magnitude 8;

5Apply to the places have no fire,no explosion danger, no serious pollution,no chemical corrosion and no violent vibration.

Executive standard:

GB7251 Low voltage complete set switchgear and control device

GB3906-2006 3.6kV~40.5kV AC metal enclosed switchgear and control device

The main technical parameters:

Rated isolation voltage: 660V, 1000V

Rated working voltage: 380V, 660V

Rated voltage of auxiliary circuit: AC220V, 380V, DC110V, 220V

Rated frequency: 50Hz～(60)Hz

Rated current: horizontal bus ≤3150A; vertical bus 630A, 800A, 1200A

Rated short-time withstand current: t50KA

Rated peak current: 50KA / 0.1s

Short-circuit breaking capacity: 50kA (effective value)

IP rating: IP30, IP40

Bus configuration: three-phase four-wire, three-phase five-wire

Operation mode: manual, remote control, automatic

			Parameter
Rated voltage		V	400	690
Rated insulation voltage		V	690	1140
Rated impact withstand voltage		V	6000	10000
Rated working short circuit breaking ability		kA	18~100	10~75
Rated utmost short circuit breaking ability		kA	25~120	20~85
Rated frequency		Hz	50/60
Rated current		A	400,500,630,800,1000,1250,1600,2000,2500,3150,4000,5000,6300
Rated control power		V	AC 110/220/380,DC 110/220
Dimension (Unit:mm)	MNS/GCS/GGD	width	400,600,800,1000,1200
		depth	600,800,1000
		height	2200

Our low voltage switchboards(switchgears) have two models, GCK and GCD. GCK Low voltage withdrawable switchgears are specially engineered for power distribution and electric motor control operations. It is suitable for 380V alternating current three phase four line and three-phase five line systems.

Detailed explanation of common faults in low-voltage distribution cabinets:

1、 The circuit breaker cannot be closed.

1. The undervoltage coil is not working (the voltage is normal). Solution: Replace the undervoltage coil.

2. Press the closing button, and the closing coil will not work when powered on. Solution: Replace the undervoltage coil.

3. Poor contact of the close button. Solution: Replace the close button.

The fuse core of the control circuit is burnt out. Solution: Confirm that the control circuit is normal and there is no short circuit before replacing the fuse.

5. The circuit breaker does not store energy. Solution: Check that the motor control power supply voltage needs to be ≥ 85%.

6. The closed electromagnet controls the power supply voltage to be less than 85%. Solution: The power voltage of the closing electromagnet needs to be ≥ 85%.

7. The closing electromagnet is damaged. Solution: Replace the closing electromagnet.

8. Poor contact in the secondary circuit of the drawer type circuit breaker. Solution: Shake the drawer type circuit breaker out and then move it to the "open" position. Check if the secondary circuit connection is reliable.

9. The universal transfer switch is in the stop position. Solution: Turn the switch to the left or right power transmission.

2、 The main switch of the incoming cabinet cannot be turned on.

1. Poor contact of the start button. Solution: Replace the open button.

2. The open coil is burnt out. Solution: Replace the open coil.

3. The main reactive power meter is reversed or not rotating. The power factor of capacitor compensation is too high. Solution: Adjust the capacitance compensation to 0.92-0.97.

4. Transformer incoming line phase sequence error. Solution: Readjust the phase sequence.

3、 The voltage and current circuit is normal.

Solution: Replace the reactive power meter.

4、 The capacitor cabinet cannot be automatically switched.

1. The current sampling signal line is not connected. Solution: Connect the current sampling signal line.

2. Check if the controller fuse core is burnt out. Solution: Replace the fuse.

3. The voltage is too high, and the controller displays overvoltage. Solution: Adjust the overvoltage protection point.

4. The current is too low, and the controller displays it in advance. Solution: Automatically works normally when the current increases.

5. Capacitor cabinet (distribution cabinet related type: box type substation | distribution box) Compensator indicates overvoltage. Solution: Adjust the set voltage value to be higher than the actual voltage value.

6. The current sampling signal line is not connected. Solution: Connect the current sampling signal line.

7. The melting core of the compensation controller is burnt out. Solution: Replace the fuse.

8. The current is too low. Solution: Further debugging and processing after increasing the current.

5、 The electricity meter in the drawer doesn't turn.

1. Check if the secondary plug-in has poor contact. Solution: Adjust the secondary plug-in contact strip.

2. Both current and voltage are normal. Solution: Replace the electricity meter.

6、 Dual power switching cannot be automatically switched.

1. The universal transfer switch is not turned to the automatic position. Solution: Turn the switch to the automatic position.

2. The manual transfer switch did not switch to the automatic position. Solution: Turn the automatic transfer switch of the handle to the automatic position.

3. The undervoltage release device is not closed. Solution: Check if the voltage is consistent with the voltage level of the release, V ≥ 85%.

4. The time relay does not close. Solution: Check if the contact voltage of the time relay is normal.

5. The shunt mechanism of the circuit breaker does not reset. Solution: Check if the mechanical interlock is loose or stuck.

7、 The power factor of the capacitor cabinet cannot exceed 0.9.

1. The capacity of the capacitor decreases. Solution: Replace the capacitor.

2. Some circuits are not powered. Solution: Check and replace.

3. The original design load has increased. Solution: Increase the compensation capacity of the capacitor cabinet.

PRODUCT PHOTO

MNS (5)

MNS (6)

MNS（）2

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EXHIBITION

COMPANY OVERVIEW

Henan Fengyuan Power Technology Co., Ltd. was established in 2010 and is an industrial giant specializing in the production of power distribution equipment. After more than ten years of development, we have become an innovative enterprise engaged in the research and development, production and customization of electrical equipment.