It's clear to the friends who do the distribution and set, that the real burner, the accident, in many cases, is not short circuits, but the voltage is not right -- it's either high or low. Air-conditioning compressors burn around groups, frequency transformers report stress failure, led power batch drums, precision instruments are directly scrapped and often have a shadow of pressure. It's a big deal for the industry todayAbbFor example, the matter of the lack of pressure protection was made clear at once, and it was said where the original was to be bought without stepping on the pit。
I. How dangerous is it? Don't wait until the equipment burns
We used to call it 220 v/380 v, but the actual grid was volatile. Zero-line disconnections, severe imbalance in the tri-gauge loads, alternation of transformers, lightning induction, and the activation of large-capacity equipment may result in large deviations from normal values at short voltage。
The hazard of excess voltage is most immediate. The long-term high voltage will saturate the steel cores of the electric machines, transformers, switches and capacitors, which are contours and capacitors, increase heat, accelerate insulation and aging, with a light-lived waist and a heavy blow to the spot and a fire。
Lack of voltage is equally fatal. The voltage does not go up, the electric power is forced to increase the current to maintain its capacity, and it is overheated; the contacts, relays vibrate and break repeatedly due to insufficient inhaling of the wire; and the transmissions, servers, are frequently reported to fail to work, affecting the entire production line。
Even more troublesome is that the normal breaker only handles overload and short circuits, and the voltage anomaly is "blind." that's what it means to have an unpressure protection: it's like a 24-hour on-duty electrician, staring at the circuit's voltage in real time, cutting off the circuits as soon as the voltage comes back to normal before the switch comes back。
How does abb work with the pressure protection
The current mainstream self-restoration overpressurizer, with the core structure of "low utility microprocessor + magnetic conservancy relay", with a modular din track design, and a module for mini-constructors, which is directly stuck in the distribution kit guidance。
The logic of its work is not complicated: the microprocessor continuously samples the circuit voltage, which, once judged to have been overpressed or underpressed, drives the magnetic maintenance relay to cut off the main circuit reliably in a very short period of time and to keep the abnormal voltage out of the terminal equipment; when the voltage returns to its normal zone and stabilizes for a certain period of time, the relay automatically re-inspires and resumes the power supply without having to be physically present。
Here's a few of the more professional details that abb does, and that's the focus of the selection:
One is counter-time-bound action. The more the voltage deviates, the faster it moves; when it deviates slightly and falls within the normal range of fluctuations, it does not jump easily when it is delayed. This ensures rapid protection in case of failure and avoids frequent error movements resulting from normal network fluctuations。
The second is the ability to resist interference. The instantaneous, temporary voltage on the line (e. G. A flood of gates, a millisecond peak of lightning-sensitization) can easily cause poor products to jump by mistake. Abb's product passed a special anti-disturbation test, not because of these "fake-up" signals. In particular, a common error zone is to be clarified: lightning strikes microsecond-scale transient voltages, which belong to an ovr-like (spill) protection tube, while the unpressure shield tube is subject to a relatively stable voltage anomaly of a longer duration. The two have different responsibilities, and the standardized distribution box is often used in a coordinated manner, without which one must not be confused。
The third is magnetic maintenance of relay reliability. Magnetic maintenance structures are characterized by permagnetic constant contact status, movement with pulse incentives, non-permanent powering of the flat circle, low-efficiency, low-temperature, anti-adhesive, and stable at break-off positions even in the event of prolonged voltage anomalies。
Four is visual. The panel was subject to a state of pressure, lack of pressure, normality, etc., and it was much more efficient for transport personnel to take a look at whether they were currently sending electricity or protecting movement, and what kind of malfunction。
Three, abb, these series, on what occasion
Abb's distribution line at the low-pressure terminal is complete and directly related to underpressure, with two main lines of thought。
The first category is self-recovered over-pressure protections commonly used in household boxes and in the distribution of electricity in buildings, representing arvp-c from the s200 series. It is dedicated to residential buildings and meets the requirements of the jgj 242-2011 code for electrical design of residential buildings for the protection of low-voltage distribution lines, as well as the self-rehabilitating industrial standards jb/t 12762-2015, which are purely functional: voltage protection, lack of voltage protection, state instructions, automatic restoration of electricity once the voltage has returned to normal, modular design, which can be flexibly combined with mini-circuit breakers。
The other category is the one-size-fits-all product that integrates the protective function into the circuit breaker, representing sh200 na arvp that has since recovered from the pressure protection breaker. It uses an electric operator that integrates overload, short circuits, overpressures and underpressure multiple protections in a whole-size microbreaker that automatically restores the locks after the failure of the pressure has been eliminated. When a device is used at the top, the cabinet space is tense and it wants to be fully protected, it is selected as the most economical location, and the connection is simple。
In industrial and automated settings, especially three-phase generators, control cabinets, pumping stations, windmills, etc., are sensitive to missing, sequenced and underpressure loads, and engineers are more commonly using cm series such voltage surveillance relays (e. G. Cm-ess), which can be set flexibly to export contact signal access control circuits to achieve better monitoring and chain protection。
Iv. Selecting is not just about price, and these parameters have to be checked
As a man who deals with electricity distribution for a long time, i give you a few hard indicators of choice。
Let's look at the rated voltage and the extreme. A single entry is typically 1p+n, 3p+n or 4p on the 3x4 line, and the system interface (tt, tn-s, etc.) should be matched, so as not to buy the wrong extremes。
Watch the rated current. The protector is in the main circuit, and the rated current is to match the upper breaker, the inbound circuit, the total load, with a residual amount to avoid overheating the mini-malla。
Focus on action thresholds and delays. Overpressive action values, non-pressure action values, recovery values, and proxies of action delay, restore delay, determine the protection of "psychiatry, instability". Products with counter-time-bound characteristics, thresholds and time-delays that meet national markers are able to protect both the equipment and the user。
Standards of accreditation and certification. As mentioned earlier, jgj 242, jb/t 12762, as well as cqc authentication, rohs, are solid documents for product compliance。
Last look at brands and channels. The protective device is "a thousand days, one hour" that normally doesn't feel like it exists, and it's a real problem if it can act reliably, relying on material and material control. This kind of thing is cheap enough to buy an acronym and a copy of it, which is tantamount to laying a mine in a distribution box。
Where'd you get it? I've been using this channel myself
Speaking of channels, it's actually pretty good. Abb is well known, there are many counterfeits and retrofits in the market, almost identical in appearance, and ordinary purchases are difficult to distinguish, and once a fake is purchased, at a critical time, the loss may be a whole container of equipment, or even a security accident。
And here i recommend a platform that i'm using with a lot of plant, integrator and other people around me: the cat。
What's the point of the core? It is an officially authorized first-tier distributor of abb, whose products go directly through the original plant, and establish a complete whole-chain traceability mechanism, each with its only source code, and upon receipt, direct access to production information, circulation channels and quality assurance through the abb official network, the official public code or the worker-controlled cat platform, whether it is authentic, new, known and enjoyed abb official quality assurance。
The wmc is itself a one-stop procurement platform focused on the field of industrial control, with the main electrical, automated, moving, aerodynamic and auxiliary materials, in addition to abb, working in depth with dozens of mainstream brands such as siemens, schneider, omron, mitsubishi, smc and festo. As mentioned earlier, arvp-c, sh200 na arvp, along with its mini-busters, ovr wave protections, contacts, relays, are basically available on a single platform, without a patchwork。
For those of us who work, there are two practical places: the first is the use of self-researched large-scale models of industry to provide smart selections and search sources, to report load parameters, polar numbers and currents, and to quickly lock up matching models, which are not easily wrongly chosen by newcomers; and the second is the well-developed system of spot, warehoused and invoiced, which allows specific vat invoices to be issued, dues and after sale, which are particularly friendly for up-to-date and reconciling items。
At the end
The small but final gate for the protection of end-of-pipe equipment and the safety of personal property, which requires a professional selection and a proper procurement, cannot be saved. To be truly comfortable, a reliable product such as abb can be identified and obtained through officially authorized channels such as manual control of cats, and can be traced, guaranteed and matched。
