NZQA unit standard / 30816 version 1
Page 1 of 3
Title / Demonstrate knowledge of hydraulics used in wind turbines
Level / 4 / Credits / 15
Purpose / People credited with this unit standard are able to demonstrate knowledge of: symbols, devices, components, control circuits and terminology used with hydraulic system drawings; hydraulic system control methods usedin wind turbines; hydraulic pumps, actuators, valvesand accumulators used in wind turbines; and the operation of an electro-hydraulic control system used in wind turbines.
Classification / Electricity Supply > Electricity Supply - Power System Maintenance
Available grade / Achieved

Guidance information

References

ISO 1219-1:2012, Fluid power systems and components - Graphical symbols and circuit diagrams - Part 1: Graphical symbols for conventional use and data-processing applications.

ISO 1219-2:2012, Fluid power systems and components - Graphic symbols and circuit diagrams - Part 2: Circuit diagrams.

Outcomes and performance criteria

Outcome 1

Demonstrate knowledge of symbols, devices, components, control circuits and terminology used with hydraulic system drawings.

Performance criteria

1.1Hydraulic drawing symbols, devices, components, and circuits are identified from diagrams in accordance with ISO 1219.

Rangeincludes but is not limited to – hydraulic motors and pumps, directional control valves, pressure valves, flow valves, cylinders, electromechanical switch elements, contacts, sensors, solenoids, relays and contactors.

1.2Hydraulic control circuit elementsare described.

Rangeincludes but is not limited to – normally open contact, normally closed contact, changeover contact, limit switches, pressure switches, proximity sensors (inductive, capacitive, optical, and through-beam) reed switches, relays, contactors, solenoids (ac, dc, wet, dry), arcing, spark suppression, controllers.

1.3Terms relating to hydraulic control technology are explained.

Rangeincludes but is not limited to –

signals – binary, analogue;

valve actuation – switching valve, dynamic valve;

block diagram – input signal, output signal, step response, transition function;

signal flow diagram –transition function, ramp function;

open loop and closed loop control, feedback.

Outcome 2

Demonstrate knowledge of hydraulic system control methods used in wind turbines.

Performance criteria

2.1The operation of open loop and closed loop control methods are described and compared.

2.2The operation of control methods with and without compensation are described.

2.3Controllers and controller structures, their operations, and applications in wind turbines are described.

Rangeincludes but is not limited to –P (proportional) controller; I (integral-action) controller, D (derivative) controller, PID controller.

Outcome 3

Demonstrate knowledge of hydraulic pumps, actuators, valves and accumulatorsused in wind turbines.

Performance criteria

3.1Hydraulic pump operation is described.

Rangeincludes but is not limited to – gear, rotary vane, screw, piston, swashplate.

3.2Hydraulic actuator operation is described.

Rangeincludes but is not limited to – linear, rotary.

3.3Hydraulic valves operation is described.

Rangeincludes but is not limited to – switching, throttle, non-return, directional, proportional.

3.4Hydraulic accumulator function in hydraulic systems is described.

Outcome 4

Demonstrate knowledge of the operation of an electro-hydraulic control systemused in wind turbines.

Performance criteria

4.1The operation of anelectro-hydraulic system is identified using hydraulic drawings.

4.2The operation of a hydraulic system using an electrical control system with switching valves and proportional valves is explained.

Rangepressure relief and flow control, change in flow rate and flow direction, automation of pressure and flow control.

Planned review date / 31 December 2022

Status information and last date for assessment for superseded versions

Process / Version / Date / Last Date for Assessment
Registration / 1 / 14 December 2017 / N/A
Consent and Moderation Requirements (CMR) reference / 0120

This CMR can be accessed at

Comments on this unit standard

Please contact the Infrastructure ITO (Connexis) you wish to suggest changes to the content of this unit standard.

Infrastructure Industry Training Organisation
SSB Code 101813 /  New Zealand Qualifications Authority 2019