كتالوج منتجات BELUK

Beluk is one of the leading manufacturers in the area of power factor control relays. Its experience in this technologically complex field dates back to 1956, and its customers have profited from its forward-looking concepts in the construction of switchgear for more than 30 years. On the basis of this know-how Beluk offers matured standard components as well as tailor-made problem solutions; the production organisation is set up in accordance with DIN EN ISO 9001:2008.

The current generation of BELUK power-factor-control relays is the result of 50 years of development: electromechanical versions to start with, electronics in the seventies, the first microcontroller relays in 1988, and today integrated interfaces for data communication. Specific relays exist for dynamic compensation, induction furnaces, medium-voltage switchgear and wind-power stations. BELUK relays “separate the chaff from the wheat” — reactive from active energy — regardless of the number of harmonics disturbing the system, and the same measuring technique is found in its power analysers. Monitoring relays for voltage, current and capacitors in medium-voltage grids as well as static switches for capacitors supplement the range.

• Power factor control relaysBLR-CX · BLR-CM-R · BLR-CM-T/RT · BLR-CM3phase
• Thyristor switchesBEL-TS 15 – 130 kvar, 400 – 690 V
• Active harmonic filterBEL-AF 35 – 120 A
• Capacitor protectionKSR1 · KSR · KSR-Z · KSR-V · VSR/VCR
• Power analyserEMM-5 with 32 meters
• Web gatewayminiSCADA — SCADA in one DIN-rail device

In times of shortage of resources and climate change, conservation of resources is a fundamental objective and increasing energy efficiency a core aim of policy. With the systematic use of power factor correction, energy losses in the transmission and distribution networks can be significantly reduced (with a corresponding reduction in CO₂ emissions), networks can be used more efficiently — for instance for the transmission of regenerative energy — and the reliability of planning for future energy networks can be increased.

The intelligent regulation algorithm of Beluk switches the steps optimised and by this guarantees short compensation times combined with the smallest amount of operations; the operating cycles are shared equally to all steps. All relevant parameters are set ex works so that in nearly all cases no further adjustments are necessary to start the regulation — to start, only the correct nominal voltage is needed. A wrong connection can be corrected by starting the automatic phase correction, and for maintenance each step can be switched manually. Settings sit in two menus: “Start” (commissioning: nominal voltage, CT and VT ratio, automatic connection correction) and “Expert”.

The BLR-CM family adds a graphical backlit LCD, THD I and the 2nd – 30th harmonics of voltage and current, energy counters (kWh import/export, kvarh inductive/capacitive), a programmable digital input for external alarms and a digital output for the fan. Measuring voltage is 50 – 530 V with a separate 230 V auxiliary supply (115 V tapping point). The optional data logger (-DM) has four parts: setup history, alarm history, a logger of measuring values in 1 – 720 min intervals (min / max / mean) and a daily logger of system information (kWh, kvarh, switching operations and step size per step, average PF and average PF of the last 24 h) — downloaded via the TTL–USB cable to a CSV file.

BEL-TS switches capacitor steps semi-controlled on two phases (terminals L1 → C1 and L3 → C3), triggered by an 8 – 30 V DC signal drawing 2 mA at 12 V. The supply is taken directly from the power connection (a separate supply is optional on the 400 – 480 V units; 230 V 50/60 Hz on the 525 – 690 V units), consumption max. 9 VA. Recovery time is typically one period; overtemperature protection and a power LED are built in.

Many electrical devices pollute the grid with non-linear load currents: devices disturb each other, the load on the grid is much higher than necessary and, in extreme situations, the supply can fail. Indications are harmonics, unbalanced load, neutral current and a bad power factor. BEL-AF improves voltage quality by filtering the current: it compensates harmonics up to the 51st order, balances the phase currents and improves the power factor, reducing the neutral current. Sized with sufficient reserve it also compensates the phase shift in real time. CT on the source side gives closed-loop control, on the load side open-loop control; up to 8 filters work in parallel with their current inputs connected in series.

High-voltage capacitors taken into operation must be supervised all the time. Most are manufactured with insulating oil as the dielectric, which could catch fire in case of failure — with some litres of oil per capacitor there is a fire load not to be disregarded, so the capacitors must be separated from the grid before a failure causes an accident. The KSR1 protects the capacitors against internal failures in a versatile way without generating useless and expensive cut-offs: it monitors current or voltage (selectable), with two threshold levels for Alarm / Trip as absolute or % values, programmed delay times, latching or auto-reset relays, a third relay for Alarm, Trip or both, and a record of the last 5 Alarm and Trip operations. A natural unbalance can be programmed in and is subtracted from the measured value.

• Double-star connection6 identical capacitors in two stars; the CT sits in the conductor between the two star points — the current indicates the symmetry.
• H-bridge connection4 identical capacitors form an H; the CT sits in the conductor connecting the middle of the left and right branch.
• Voltage monitoring3 capacitors in star; three 2-pole insulated VTs with secondaries in series — the voltage indicates the symmetry.

The KSR measurement system provides 3 voltage and 4 current channels with high-precision input filters (3 dB cut-off 2.5 – 3 kHz). N need not be connected — an internal resistor network provides an artificial N. CTs of 1 A or 5 A depending on the type, CT ratio 1 – 10 000, channel 4 (out-of-balance current) with its own ratio and one-button compensation of the natural unbalance. Nearly all displayed values are true RMS, and a full-range FFT is performed on all channels. A big backlit LCD and four context-sensitive soft-keys give instant usage without the manual.

KSR-Z — the next generation

KSR-Z is always equipped with the fault recorder, Modbus interface and blocking input, and comes with factory-set protection settings so that only the threshold needs adjusting. Beyond the standard time delay it can use ANSI / IEC tripping curves, so alarm / trip depend on the height of the violation; calculated values such as earth fault and voltage asymmetry are available, each in two independent steps (alarm / trip), and an additional timer detects repetitive short-time violations (memory effect).

Every setting in the alarm matrix can be shown on the display, stored in the fault recorder, blocked by the digital input, and reset automatically or manually.

KSR-V — voltage-unbalance protection

The KSR-V provides 7 input channels: grid voltage on L1, L2, L3, (N) with a VT ratio up to 4000, and four special out-of-balance voltage channels V1 – V4 (0 – 20 V AC via VTs with open-delta secondaries, max. overload 120 V) so the unbalance of four capacitor banks can be monitored, each in two steps (Alarm / Trip) with separately adjustable threshold and delay. The FFT on the voltage channels matters because capacitors can be damaged by voltage harmonics. Order codes KSR-amv-V/W/S/T/B/C by supply (110 V DC, 220 V DC, 24 V DC, 48 V DC, 110 V AC, 230 V AC); options -MB, -VT; accessories UMS9 and 3ZWC.

The EMM-5 offers 32 programmable thresholds on a selection of 52 measuring values, monitoring of exceeding and shortfall with alarm and drop-off delays of 0 – 600 s, and programmable alarm announcement by 2 C/O contacts (-m), 4 N/O contacts (-a), text message on the LCD, event logging with date and time (-DM), blocking of alarms in special situations such as a motor start via the digital input (-DM), and read-out over RS485 Modbus (-MB, -DM). Measuring values are recorded in programmable intervals with date, time, minimum, maximum and mean, downloaded to a CSV file through the TTL–USB converter.

The VSR (three-phase) and VCR (single-phase) monitor grids and detect dangerous situations for connected capacitors or other electronic devices. Capacitors in compensation panels can be damaged by overloading or voltage peaks, so monitoring the voltage including harmonics is recommended: on violation of a threshold the display shows it and a relay can switch the capacitors off. True-RMS values and a full-range FFT on the 3 / 1 voltage channels; big backlit LCD with four soft-keys.

The miniSCADA is an easy-to-use web-based SCADA system for local and remote monitoring and control over Ethernet, internet, LANs, telephone modems, GSM (external modem) and GPRS. Its built-in web server is used to customise the graphical interface: connect the Modbus devices, select the desired data — up to 400 Modbus registers — and it appears on the onboard web pages without HTML programming, Windows tools, licences or royalties. Up to 64 alarms are sent by e-mail or SMS with user-defined text and stored in an alarm history; up to 64 parameters are logged at 10 s – 60 min sample rates with trend graphs and CSV download. As a Modbus TCP gateway it acts as a transparent bridge between serial Modbus RTU devices and SCADA systems or PLCs. Security: user name and password assigned by the administrator; the database is kept consistent on power loss.

• Simple installationcomplete SCADA system in one DIN-rail device, no software on the PC
• Web server with up to 30 pagesdisplay and parametrising in any browser, also via internet
• 64 programmable alarmsby e-mail, or SMS with MiniSCADA2 (internal GPRS modem)
• Modbus master for up to 32 devicesBLR-CM, BLR-CM3phase, KSR and any RS485 Modbus RTU slave