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High-Voltage Cabinet

Product Introduction

The KYN61-40.5 (2) Type armored removable AC metal enclosed switchgear (hereinafter referred to as the switchgear) is an indoor complete distribution device for three-phase AC 50Hz, rated voltage 40.5kV. It is used for accepting and distributing electrical energy in power plants, substations, and industrial and mining enterprises, providing control, protection, and detection functions for the circuit. It can also be used in places with frequent operations. This switchgear complies with standards GB/T11022-1999, GB3906-2020, and DL404-2007, among others.

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The cabinet structure adopts an assembly type, and the circuit breaker adopts a trolley floor-standing structure; it is equipped with a new type of composite insulation vacuum circuit breaker, which features good interchangeability and simple replacement; the trolley frame is equipped with a screw nut propulsion mechanism, which allows for easy movement of the trolley and prevents damage to the propulsion structure due to accidental operation; all operations can be performed with the cabinet door closed; the interlocking between the main switch, trolley, and switchgear door all adopt a mandatory mechanical locking method, meeting the 'five prevention' function; the cable compartment space is ample, allowing for the connection of multiple cables; a fast grounding switch is used for grounding and circuit short-circuiting; the enclosure protection level is IP3X, and the trolley compartment door is IP2X when open; the product complies with GB3906-2020, DL404-2007, and refers to the international IEC-298 standard.

Parameter Category	Specific Parameter Name	Definition and Meaning	Application Impact (Why It Matters)
Voltage Parameter	Rated Repetitive Peak Reverse Voltage (VRRM)	The maximum allowable repetitive reverse voltage that a device can withstand during long-term operation (upper limit without breakdown or damage).	Determine whether the device can adapt to the high voltage environment of the target circuit, it must meet VRRM ≥ the maximum reverse voltage of the circuit (usually with 20% redundancy), otherwise it will be reverse breakdown.
	Reverse Breakdown Voltage (VBR)	The voltage at which the reverse current sharply increases (destructive threshold, beyond which the device will be permanently damaged).	VBR is the design basis for VRRM, usually 10%-20% higher than VRRM, to determine the device's voltage withstand safety margin.
	Forward Voltage Drop (VF)	The voltage drop across a device when it is forward biased (usually tested under rated forward current).	The smaller the forward voltage drop, the lower the power consumption (P=IF×VF) during the rectification process, the less the device heating, the higher the efficiency (especially in high current scenarios).
Current Parameter	Rated Average Forward Current (IFAV)	The maximum average forward current that a device is allowed to pass during long-term operation (defined by the sine half-wave rectification waveform).	Determine whether the device can carry the working current of the circuit, it must meet IFAV ≥ the actual forward average current of the circuit, otherwise it will overheat and burn out.
	Forward Surge Current (IFSM)	The maximum allowable peak forward surge current that can be tolerated for a short time (typically within 10ms, such as during circuit startup).	To avoid damage to the device by surge current when starting up or when the load suddenly changes, the peak surge current of the circuit (such as the capacitor charging current when the power supply starts) needs to be matched.
	Reverse Leakage Current (IR)	The reverse current flowing through the device when the rated reverse voltage is applied (the smaller the better).	Large leakage current will cause increased reverse power consumption (P=VR×IR), especially in high voltage scenarios, excessive leakage current will cause the device to heat up, efficiency to decrease, and even affect the stability of the circuit.
Temperature Parameters	Junction Temperature (TJ)	The maximum allowable temperature of the internal PN junction of the device (usually -55°C to +150°C/+175°C).	When the junction temperature exceeds the limit, the device's reverse voltage withstanding will decrease, leakage current will surge, and it may even result in permanent failure; the actual junction temperature needs to be controlled ≤TJ through heat dissipation design (such as heat sinks).
	Storage Temperature Range (Tstg)	The allowed ambient temperature range for the device when it is not in operation (usually -65°C to +175°C).	Determine the adaptability of the device's transportation and storage environment, to avoid low temperature cracking or high temperature aging.
Other Parameters	Reverse Recovery Time (trr)	The time for the reverse current to drop from peak to a specified value when the device switches from forward conduction to reverse blocking.	For high frequency and high voltage rectifier circuits (such as switching power supplies), the smaller the trr, the lower the reverse recovery loss, and the smaller the circuit EMI (electromagnetic interference); low frequency scenarios (such as mains rectification) have lower requirements for trr.