The summary of the causes of cable common problems

This article outlines the common issues encountered with high-voltage cables and explores their root causes. Historically, high-voltage cable joints were manufactured using methods such as wrap-around, die-cast, and mold-type techniques. These processes required significant on-site labor and were often limited by environmental conditions and manufacturing constraints. As a result, air gaps and impurities frequently formed between insulating layers, increasing the likelihood of failures. In China, the most commonly used types today are assembled and prefabricated, offering better reliability and easier installation. Cable joints are typically divided into two main categories: end connectors and intermediate joints. Regardless of the type, failures often occur at the point where the insulation shield is broken. This area experiences high electrical stress, making it a critical weak point. Manufacturing-related issues such as defects in the stress cone, problems with insulation fillers, or oil leakage from seals can all contribute to joint failure. The cable grounding system plays a crucial role in ensuring safe operation. It includes components like the grounding box, grounding protection box (with a protective layer arrester), cross-interconnect box, and cover protector. A common issue arises when the boxes are not properly sealed, leading to multiple grounding points. This can cause excessive induced currents in the metal sheath, potentially damaging the cable. Additionally, improper selection of protective layer arrester parameters or unstable quality of zinc oxide elements may lead to premature failure of the protection device. The first branch factory of Tianjin Cable Factory was established in 1972, specializing in the production of a wide range of cables for various applications. Their product line includes mining communication cables, optical communication cables, RS485 dedicated lines, computer cables, super five cables, control cables, shielded cables, flame-retardant and explosion-proof mine cables, audio signal cables, local telephone cables, Category 6 network cables, mine network cables, airport lighting cables, photoelectric composite cables, shielded twisted pair cables, and steel wire-armored cables. With decades of experience, they continue to provide reliable solutions for industrial and infrastructure needs. For more information or inquiries, feel free to contact us.

STEP Inverter

AS380 series elevator integrated drive controller is the new generation of state-of-the-art elevator-specific control and drive device. With full consideration of the safety & reliability of elevator;inherent characteristic of elevator operation and specific feature of potential energy load for elevator, AS380 series elevator integrated drive controller adopted advanced technology of frequency control of motor speed and intelligent elevator control as well as the integration of control & drive of elevator to make the further improvement of the product performance, easy-to-use property and cost efficiency.

Main features

a) Prefect integration of control and drive of elevator. The whole device features compact structure and small size, fewer connections, which is characterized as high reliability and easy-to-use property and cost-efficiency.

b) Double 32-bit embedded microprocessor jointly finish the elevator operation and motor drive control

c) Redundant safety design , double safety protection for control processor and drive processor to achieve the maximum safety guarantee for elevator travel

d) The design requirements of anti-interference capacity go beyond the highest standard in the industrial design requirement. e) All CAN bus communication make the whole system connected easily, data transmitted strongly, and more reliable.

f) The adoption of the advanced direct landing technology make elevator running more efficiently

g) The advanced multifunctional elevator operation mode can fully meet various needs of customers`

h) Advanced group control feature. Not only compatible with the traditional group control mode of up to 8 units, but also support the new group control of destination floor distribution.

i) The adoption of advanced vector control technology can make the motor speed adjusted well for the realization of the best elevator comfort.

j) Adapt to both synchronous motor and asynchronous motor.

k) Newly-developed none-load sensor-activated compensation technology provides excellent starting comfort to elevator even if no counterweight is installed.

l) To adopt incremental ABZ encoder to realize the synchronized control of motors. To adopt the none-load sensor-activated compensation technology to achieve the excellent start-up comfort.

m) New PWM dead band compensation technology can effectively reduce the motor noise and loss of machine.

n) Dynamic PWM carrier modulation technology can effectively reduce the motor noise.

o) Auto-tuning phase of synchronous motor without encoder

p) Asynchronous motor is not required for motor parameter acquisition process once the motor parameter is set correctly. The convenient static motor parameter acquisition process is available If is impossible to acquire the exact motor parameter on site. So there is no need to hoist the car and etc in this way.

q) The hardware is the 6th generation of module with the junction temperature resistance up to 175℃. Low loss for switch and connection to ensure the long use life.

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