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Pole Top Control Cubicle

Operation and Features

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Single LV Auxiliary Power Supply

Single Pole Battery Circuit Breaker

110V or 240V AC from LV Supply on same pole or nearby

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Dual LV Auxiliary Power Supply

Single Pole Battery Circuit Breaker

110V or 240V AC from LV Supply on same pole or nearby

Alternate 110V or 240V AC Supply from other side of switch

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Integrated plus LV Auxiliary Power Supply

Single Pole Battery Circuit Breaker

110V or 240V AC from LV Supply on same pole or nearby

27V AC Supply from Voltage Transformer on Pole

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Single Integrated Power Supply

Single Pole Battery Circuit Breaker

27V AC Supply from Voltage Transformer on Pole

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Pole Top Control Cubicle Operation

PTCC operation is primarily via the Operator Control Panel Module (OCPM)

The OCPM can be used to:

Trip and Close the switchgear.
Isolate the Trip and Close circuits.
Change Operator Settings such as Auto Reclose ON/OFF, Local/Remote mode etc.
Change configuration settings for protection, communications, metering etc.
Check the status of the switchgear.
View system analogue values.
View the event history.
View maximum demand records. ❒

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Operator Control Panel

Close coil isolation switch in series with the close coil. With this switch in the OFF or ISOLATE position the recloser can not close in response to a close request either by an operator or by the microprocessor.

Trip coil isolation switch in series with the trip coil. With this switch in the OFF or ISOLATE position the recloser can not open in response to a trip request either by an operator or by the microprocessor.

CLOSE push button sends a close request and contains an embedded red LED that indicates closed status when the control panel is switched ON

TRIP push button sends a close request and contains an embedded green LED that indicates open status when the control panel is switched ON

HELP push button when pressed provides information on the page the display is currently on

Panel ON/OFF push button turns the panel ON and OFF

Microprocessor LED blinks every two seconds (even when panel OFF) to indicate healthy microprocessor

MENU push button allows movement between the four display groups and acceptance of new settings

<= and => push buttons allows movement within the four display groups and change of existing settings

SELECT push button allows existing settings to be selected for change

QUICK KEYS allow quick and easy change of settings commonly used by field staff

Use of the Operator Control Panel is described in the recloser manual

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PTCC Control Panel Navigation

System Status

Event Log

Measurement

Protection

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System Status display group

Communications Parameters

Loop Automation Configuration

IOEX Status

WSOS Port P8 Communications

Quick Key Map

Selection

Options 1-3

Capability

Switchgear Wear and General Details

Switchgear Type and Ratings

Radio and Time Set

Switchgear Terminal Designation

Phase Voltage and�Power Flow

Live/Dead Indication

Switchgear Status

Operator Settings

Loop Automation

Fault Flags

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Event Log display group

Oldest

Continue

Most Recent

Event Log

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Measurement display group

Configurable History�OR�Average Demand

Weekly Maximum Demand

Monthly Maximum Demand

Supply Outages

Power System Voltages

Pages 1 - 2

System Measurements

Instantaneous Demand

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Protection display group

U/O Voltage Protection Page 1 - 3

NPS Work Tag Protection

NPS Single Shot Protection

NPS Protection�Trip Number 1 - 4

Earth Work Tag Protection

Earth Single Shot Protection

Earth Protection�Trip Number 1 - 4

Phase Work Tag Protection

Phase Single Shot Protection

Phase Protection�Trip Number 1 - 4

Under/Over Freq�Prot Pages 1 - 2

Directional Blocking�Pages 1 - 3

Protection Settings�Page 2 - 5

Protection Settings�Page 1

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OCPM Menu navigation

EVENT LOG

MENU

SYSTEM STATUS

MEASUREMENT

PROTECTION

MENU

PANEL�ON/OFF

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Pole Top Control Cubicle Hardware Features

Features of the CAPM card include:

16Mhz 68332 Microprocessor
Run time workspace

1 MB volatile memory

Program, Configuration, History

2 MB non-volatile Flash – CAPM4
4 MB non-volatile Flash – CAPM5

A-D conversion

10 bit CAPM4
12 bit CAPM5

Electronics rated for 80ºC
Real time Microprocessor technology
Inbuilt Switch Mode Power Supplies.
Inbuilt Radio Modem and RS232 port.
No DIP switches to break or corode.
All contained in sealed stanless steel enclosure. ❒

Control is by way of a Motorola 68332 microprocessor operating at 16MHz.

4 MB of non-volatile memory is used to hold programs, configuration parameters and historical data. (2 MB for CAPM4) 1 MB of volatile memory is used as a run time workspace.

All of the electronic components carry an 80^OC rating for reliable operation in tropical conditions. Each CAPM is heat / cold cycled and operates through a minimum 500 simulated operations as part of routine testing.

Real time programming provides fast, accurate response to changes in system conditions.

The Control and Protection Module (CAPM) has on board switch mode power supplies to provide supplies for capacitor charging, for radio or telephone modem and for battery charging.

An in built V23 FSK (Frequency Shift Keying) radio modem at 1200 bps and a variable speed (300, 1200, 2400, 4800 or 9600 bps) RS-232 port makes connection to a SCADA system reliable and cost effective.

All programming of the CAPM is by way of the control panel or by a serial interface to a PC or laptop.

The electronics compartment is manufactured from marine grade stainless steel and is fully sealed for long life.

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CAPM – Flow diagram

RADIO

MODEM

REMOTE�I/O

OPERATOR�SUB SYSTEM�PANEL

WSOS�OPERATOR�PC

TRIP�CAPACITOR

UNINTERRUPTIBLE�POWER SUPPLY

SOLENOID�POWER�SUPPLY

ANALOGUE TO�DIGITAL�CONVERTER

ANALOGUE �FRONT END

MODEM

SERIAL�INTERFACE

MICRO�PROCESSOR

DIGITAL INTERFACE

V23 FSK

RS232

SPI

RS232

CLOSE�CAPACITOR

BATTERY

CAPM

CONTROL CUBICLE

AUXILIARY POWER SUPPLY

TRIP�SOLENOID

CLOSE�SOLENOID

MEMORY

AUXILIARY�SWITCHES

VACUUM�INTERRUPTER

PRESSURE�SENSOR

CVT

CT

CVT

HV LINE 3 PHASES

CIRCUIT BREAKER

CONTROL CUBICLE ENTRY MODULE

CONTROL�CABLE

The 68332 microprocessor and associated memories are the heart of the Control and Protection Module (CAPM). Analogue and digital information is processed to arrive at a decision to change the state of the switch. Trip or close is achieved through capacitor discharge via the solenoid power supply to the appropriate solenoid.

The Uninterruptible Power Supply consists of two sealed lead acid batteries maintained by a microprocessor controlled, float compensating battery charging facility. The battery charging supply is by way of external AC supply or by an HV VT mounted either on the recloser or on the pole.

Operator interface is by way of the Operator Control Panel Module (OCPM) using a membrane keypad and LCD. Alternatively a local operator can connect a laptop computer and use Nu-Lec’s Windows Switchgear Operating System (WSOS) to control the recloser, change settings, download information etc.

Remote control can be achieved using WSOS over a telephone or radio communications system or by way of a compatible SCADA system.

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Pole Top Control Cubicle Software Features

Operational

Protection

Communications

Metering

Event Logging

Automation ❒

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Operational Features

The PTCC has a number of operational features that can be activated from the control panel.

Local or Remote mode can be selected.

Auto Reclose or Single Shot modes.

Work Tag can be applied during live line work.

Protection On/Off control.

Separate Earth and Sensitive Earth Fault On/Off control.
Protection Group Selection.

Compensation for high loads following an outage. ❒

Some controls are required by operators on a regular basis and are located on the first or second screen in the System Status menu.

1st screen - OPERATOR SETTINGS

Local mode - a close or altering Work Tag status is only permitted for a local operator (i.e. a close via SCADA control or an IOEX designated as Remote is denied)

Remote mode - a close or altering Work Tag status is only allowed permitted for a remote operator (i.e. a close from the panel or from an IOEX designated Local is denied)

In either case, a denied close will generate an advisory message on the LCD screen and log a “Denied Wrong Mode” event.

EF and SEF ON / OFF status - It is generally SEF that is turned OFF when (eg) paralleling feeders during load transfer. EF OFF can be configured to be unavailable at this screen. The control for this is located on the OPTIONS 1 screen.

Auto Reclose ON / OFF - Sets Single Shot mode when OFF. Setting Auto Reclose OFF is not required for a normal close since the CAPM uses Single Shot settings when closing. It may be required to be set OFF for (eg) bush fire mitigation.

The above settings all can be changed either by SELECT and arrow keys or through use of quick keys.

Protection Group selection - the operator may have to set the protection group for some emergency switching configurations.

Work Tag ON / OFF - This field can only be changed by a Local Operator if the CAPM is in Local mode, or by a remote operator if the CAPM is in Remote mode.

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Protection Features

The PTCC has protection elements for:

Overcurrent, Earth Fault and SEF
Directional O/C, Earth and SEF
Negative Phase Sequence
Under/Over Frequency
Under/Over Voltage
Loss of Phase

As well as the following features:

High Current Lockout
Inrush Restraint
Cold Load Pickup
Sequence Control
Live Load Blocking
Dead Lockout

% Setting Current

time [s]

100

1

10

100

High Current Lockout – Terminates an auto reclose sequence after a selected trip if the fault current exceeds a set level.

Inrush Restraint – IR raises the phase and earth threshold current for a short period of time to allow inrush to flow thus avoiding nuisance tripping when closing an ACR.

Cold Load Pickup – When a load has been without supply for a period of time (hours) it loses its diversity. CLP automatically allows for this by timing the loss of supply and raising the threshold current accordingly.

Sequence Control – Ensures that the reclose sequence for reclosers in series along a feeder stay in step when only one trips.

Loss Of Phase (LOP) Protection - Trips the recloser and sets lockout if phase/ground voltage on one or two phases falls below a user defined Loss Of Phase voltage threshold for longer than a user defined Loss Of Phase time. The lost phase(s) are reported in the event log. Can be set OFF.

Live Load Blocking - All close requests are disregarded if any load side bushing is live. Can be set OFF.

Dead Lockout – Causes a recloser to go to lockout after a protection trip if there is no supply on the bushings.

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Communications Features

The PTCC incorporates the following communications features.

Inbuilt RTU for radio telemetry

RS-232 Port for connection of telephone or radio modem

Industry standard SCADA protocol emulation

DNP3, IEC-870, PGE-2179, Conitel 2020

Provision for external RTU or substation control with IOEX (Input Output Expander) ❒

An inbuilt RTU is included on the CAPM. This is in the form of an FSK (Frequency Shift Keying) modem providing half duplex V23 signals at 1200 bps. Further information on the interface can be found in the recloser manual.

An RS-232 port configured for operation at 300, 1200, 2400, 4800 or 9600 bps is fitted to the CAPM to provide a connection point for a telephone or radio modem. The WSOS program or (eg) dnp3 protocol can be used over a remote link to provide remote control and data acquisition.

Nu-Lec can emulate a specific communications protocol to interface directly into an existing SCADA system

Alternately we can provide an Input Output Expander (IOEX) to connect to an external RTU or a substation control panel. The IOEX can be designated as Local or Remote device, depending on the application.

More information on the IOEX can be found in the recloser manual.

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Metering Features

The PTCC measures:

Phase Current
Bushing Voltage

Calculation and display of:

Earth Current
Negative Phase Sequence Current
Frequency
Phase to Phase voltages
Power (Real, Reactive and Apparent)
Power Factor

Demand Logging (Average, Weekly and Monthly)
Supply Outage measurement ❒

A�n�a�l�o�g�u�e

D�i�g�i�t�a�l

C�o�n�v�e�r�t�e�r

2000:1

CTs

I_P

ACR/LBS

CAPM

I_S

A

B

C

I_C + I_A + I_B = 0

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Event Recording

The PTCC (CAPM5) can store and display in excess of 5000 events.

40 standard event types

14 maintenance event types

10 msec time resolution

Maximum RMS fault current detected during a fault episode

Retrieval by PC or telemetry using WSOS ❒

The event log is stored in non-volatile memory and can hold in excess of 3,000 events for a CAPM4 and 5,000 for a CAPM5 before the oldest data is overwritten.

The 40 standard and 14 maintenance event types together with explanations are listed in the recloser manual.

Digital signal processing is utilised to determine the maximum RMS value of current during a fault episode. This value together with the time it was logged, which protection element operated (if applicable) and the phase on which it was recorded is listed in the event log.

The event log provides time and date stamped events with a 10msec resolution.

The event log can be viewed locally on the LCD or retrieved and viewed using a laptop or PC and the WSOS software. WSOS can operate locally through a serial interface or remotely using a modem and the RS-232 interface or by using the V23 FSK on-board modem.

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Automation Features

The PTCC has four separate automation features:

Automatic Protection Group Selection

Generator Control

Auto - Changeover Scheme

Loop Automation ❒

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