Information Sheet

ManualsBrandsSchweitzer Engineering Laboratories ManualsElectronicsSEL-8340

Date Code 20191014 Information Sheet SEL-734W and SEL-WCS

SEL-734W and SEL-WCS

The SEL-734W Wireless Capacitor Bank Control is a system that includes the

controlling device (SEL-734W) and the line current sensors (8340). The sensors

report line in the current via radio transmission. The SEL-734W includes a radio

receiver used solely for the purpose of receiving the transmissions from the line

current sensors. A capacitor bank control uses measurements of voltage and cur-

rent on the distribution lines of an electric utility to determine if the distribution

of electric power can be made more efficient by connecting a capacitor from the

phase to the neutral conductors of the distribution system. Based on user-select-

able settings, the SEL-734W will drive the capacitor bank switches to connect/

disconnect the capacitors from the power lines of the distribution system. Opera-

tion of the SEL-734W is the same as the operation of the SEL-734B with the

exception of how the line currents are read.

The SEL-734B accepts wires carrying low-level voltages that are an analog rep-

resentation of the current in each of the power system conductors. These wires

are connected to sensors attached to the power lines, with the sensors converting

the current to low-level voltages known as low-energy analog (LEA) signals. For

information that is common to both the SEL-734B and the SEL-734W including

installation, operation, and settings, refer to the documents found at

www.selinc.com/products/734B. For information on how the SEL-734W and the

SEL-734B differ, refer to the sections below.

SEL Wireless Current Sensor (SEL-WCS)

Overview

The SEL-WCS provides measurement of power line current both for the funda-

mental frequency and harmonic frequencies (up to the 15th). This sensor is pro-

vided in a package that is easy to mount using a hot stick and requires no wiring

to the capacitor bank control or to a power source. Power is harvested from the

magnetic field surrounding the power line when current is flowing. The

SEL-WCS operates without the use of a battery, eliminating that maintenance

concern while allowing for a smaller, simpler device. The SEL-WCS measures

the current and updates the SEL-734W periodically, making sure that it has

enough stored energy to complete the measurement and transmit the information

to the SEL-734W before beginning the measurement process. The SEL-734W

provides a measurement range of 2 A to 1000 A. The SEL-WCS is paired to an

SEL-734W by settings selections made on both devices.

Current Measurements

Measurements are made by the sensor and sent to the SEL-734W about once

every 1.1 seconds or as harvested energy allows, whichever is slower. The

SEL-734W will use the last value transmitted in all reporting, calculations, and

actions involving the current until the next update of the current. If the

SEL-734W has not received a recognizable update within a certain timeframe,

the current value is set to zero and stays at zero until the next successful update.

A switch-selectable setting for the SEL-WCS tells the sensor whether it should

calculate the magnitude and phase values of the harmonics. By selecting the

SEL-734W Wireless Capacitor Bank Control

and SEL-WCS Wireless Current Sensor

Summary of content (11 pages)

PAGE 1
SEL-734W Wireless Capacitor Bank Control and SEL-WCS Wireless Current Sensor SEL-734W and SEL-WCS The SEL-734W Wireless Capacitor Bank Control is a system that includes the controlling device (SEL-734W) and the line current sensors (8340). The sensors report line in the current via radio transmission. The SEL-734W includes a radio receiver used solely for the purpose of receiving the transmissions from the line current sensors.
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Product Overview option for no calculation of the harmonics, the sensor will send updates more frequently (for line currents below 200 A). Table 1 compares typical update periods with and without harmonics calculation for certain values of line current. Table 1 WCS Typical Update Period Versus Line Current Line Current (amps rms) No-Harmonics Update Period (seconds) Harmonics Update Period (seconds) 2 20 64 5 4.1 12.5 10 2.0 5.7 20 1.1 2.0 50 1.1 1.4 100 1.1 1.
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Product Overview 3 Integrated Radio The 900 MHz radio module is mounted inside the SEL-WCS cone for environmental protection. The radio communicates to a single SEL-734W to transmit load data. Dip Switches The control DIP switches inside the housing allow easy selection of the identification of each sensor.
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Product Overview SEL-WCS Settings Network ID settings The SEL-WCS has a 4-bit DIP switch that allows it to configure the Network ID. Table 2 shows the frequency associated with each Network ID. DIP switches SW1–SW4 shown in Figure 2 are for the Network ID.
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Product Overview 5 Phase identification Settings The SEL-WCS uses two DIP switches to configure the phase information. Table 3 shows the phase identification settings. Table 3 Phase Identification Configuration Switch Settings Phase 00 A 01 B 10 C 11 Reserved SEL-734W Settings The Network ID must match the Network ID setting for the SEL-WCSs used with this SEL-734W. The other settings on the 734W are explained below.
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Product Overview SEL-WCS Installation Install the SEL-WCS on a distribution line by using an industry-standard shotgun stick. Step 1. Use a shotgun stick to grasp the hook eye on the side of the SEL-WCS and place the device on the line so that the opening hangs over the line. Figure 5 Step 2. Apply slight downward and sideways pressure until the device is closed around the line. The spring mechanism should be pushed in so that it wraps around the line. Figure 6 Step 3.
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Safety Information 7 Safety Information Regulatory Information DANGER Install fault transmitters and sensors in accordance with normal safe operating procedures. These instructions are not intended to replace or supersede existing safety or operating requirements. Only trained qualified personnel with knowledge of high voltage safety should install or operate fault transmitters. CAUTION Although the power level is low, concentrated energy from a directional antenna may pose a health hazard.
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Safety Information Dangers, Warnings, and Cautions This manual uses three kinds of hazard statements, defined as follows: DANGER Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury. WARNING Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury. CAUTION Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate injury or equipment damage.
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Safety Information WARNING AVERTISSEMENT Do not perform any procedures or adjustments that this instruction manual does not describe. CAUTION Ne pas appliquer une procédure ou un ajustement qui n’est pas décrit explicitement dans ce manuel d’instruction. ATTENTION Equipment components are sensitive to electrostatic discharge (ESD). Undetectable permanent damage can result if you do not use proper ESD procedures.
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4 SEL-WCS Specifications SEL-WCS Specifications SEL-WCS Receiver Card Compliance Designed and manufactured under an ISO 9001 certified quality management system General Antenna Connector: RX Sensitivity (1% Error Rate): FSK –40° to +85°C (–40° to +185°F) Storage Temperature Link Range TBD –40° to +85°C (–40° to +185°F) Operating Environment Type Tests Electromagnetic Compatibility Emissions Pollution Degree: 2 Relative Humidity: 5%–95%, noncondensing Maximum Altitude: 2000 m Radiated: 47
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SEL-WCS Specifications Table 2 5 Certifications by Country Country Part Number Authority Reference U.S.A.