Rig Power Control and Drive System

TSC offers Offshore Drilling Platform Power Control Package with 600/480/200V power distributions, drives and controls for the elevating or half latent drilling vessels. This constant system can exceed the demands of the offshore drilling task.
The design is based on the ABS specifications （MOBILE OFFSHOTRE DRILLING UNITS 2006）and conforms to the standards of offshore drilling. As a component of offshore drilling platform, our power package performs exceptionally. It includes digital diesel generator set control system, power management system, MCC, VFD drive system, logic control system of management program, and communication system of industrial network. TSC provides flawless after sale services. TSC's mission is to meet any customers' requests with our superior sales, services and solutions completed specifically for drilling industries.

Digital Diesel Generator Set Control System

The control module is a full digital controller based on a micro processor. It includes generator control, synchronization, load control, sequential control on generator set, electric parameter detection, protection, communication and display function. It is a foundation of power management system and makes the control module take the local and remote operational orders to control the generators; it also receives the relevant data from power management system according to the demands from the programmable controller.

Control Module Functions

• Locally/remotely start or stop the generator set
• Locally/remotely operate the generator to get synchronized, online/offline Functions of Power Management System
• Generator soft load and unload
• Auto load equipoise
• Auto reactive power equipoise
• Generator protection, such as over voltage, under voltage, over frequency, under frequency, over load and reverse power

Power Management System

Based on digital diesel generator set control system, PLC technology, industrial network technology and HMI, the power management system will optimize the control on generator and keep a close watch on the parameterized data. In this system, all the remote operation and display are located on the instructive station of a touch screen in the central control cubicle, but the local operation and display on the generator set control cubicle or driller’s console.

        Functions:

• According to the states of loads automatic start or stop the generator set
• Parameter set of the generator load
• Sequential control of generator set auto start or stop
• Alarm and emergent stop
• Single display the states of generator set and public main bus
• Display the data of generator set and main bus
• Operation authority management

Flexible Disposal MCC

MCC provides the MAIN MCC, VENTILATION MCC, DRILLING MCC, DRILLFOOR MCC and EMERGENCY MCC with different voltage such as 480V and 220V. MCC has many control methods such as HOA/3WRC/S-S and so on. Besides, it can decrease the voltage of a motor for big power to minimize the attack suffered for the power supply.

VFD Drive System

VFD drive offers the drawworks, top drive/rotary table and other drilling devices a smooth and steady power. VFD drive system is better featured. For example, it makes most use of electricity and has a simple construction and a smooth speed and torque control. Additionally, it keeps noise low and takes a small installation size, reliability and longevity.

Strong Points showed by the frequency converter:

1. Compared to the series excitation motor, the VFD system provides a better speed adjust. The effect of motor speed suffered from the loam becomes smaller. Vector running will be not fluctuated with the load. In addition to that, the encoder will output about 80% rated torque at the zero speed to have a suspension stop.
2. The power factor of VFD speed adjust system reaches at 0,99 and feedbacks the energy accumulated at the dynamic brake to the DC main bus for the use of other devices. Thus, it saves a lot of energy.
3. It has a torque limit and over load protection.
4. Via the special interface, the frequency converter is connected to the computer, so that the well site and the drilling parameters will be monitored at time.
5. No commutator in the frequency motor, so the repair and maintenance cost will be low.

VFD Elevating Leg Control System

General Introducion of System

The system is composed of VFD driver (VFD), Motor Control Center (MCC), leg length detecing system, central control console (CCC) and platform inclinometer. Via communication between the man and the machine, the system will be monitored and controled.

Composition of System

It consists of port leg, forward leg, starboard leg drive and control system, control control console and braking resistor.

Operation and Control

a) two modes

1. remote integrated control mode
2. local control

When the first mode is selected, the operation will only be finished at the contral control console.

b) two speeds

1. leg normal speed 1.50 feet/m
2. leg normal speed 1.65 feet/m

c) local control

1. select the local control
2. work on the local control in the local control box

Speed of each leg may be ajusted as to the running states.

Monitoring System

It is equipped with a touch screen in which there are two modes, namely, monitoring screen and controling screen. Each leg has these two screens.

1. Monitoring Screen

Functions listed as following:

a) leg running states, speed, rate, current, voltate, power
b) leg running length
c) motor running states,current, overload and fault information
d) motor brake running states, switch position and fault information
e) leg dynamic running, fault information
f) motor current alarm setting value

2. Control Screen

Functions listed as following:

a) total load, average load, maximum load, minimum load on each leg conner
b) display the running length and its correction setting
c) speed adjust system
d) upper limit and lower limit alarm piont and their alarm points
e) electronic inclinometer monitoring system and its inclination parameters and the inclination parameters when the system stops
f) torque distribution setting of leg single motor
g) load monitor of leg single motor

3. Speed Accuracy Adjust System

There are two speed control in the system, at the same time, a speed accuracy adjust system is showed on the touch screen. When some external objects causes an inconsistent leg height during the platform is working, the speed referenc is available to adjust on the screen, so that actual height of each leg will be the same.

4. Jacking Anti-collision System

A height detecting encoder is mounted in the system, when the leg travels to a preset alarm point, a visual and audibel alarm will be made. When it travels to a slowing point, the leg will automatically slow down. And when it travels to an emergent point, the system will send out braking signals to activate the braking unit and prevent the leg from moving to a limit point.

5. Platform Inclination Correcting Sysem

After a limit inclination angle is preset, when the platform inclination angle comes to a limit inclination angle, the system will automatically calcuate and ajust the correspondent leg speed to correct the inclination angle, so that, the system comes to a safety area.

6. Fault DiagnosisSystem

The fault diagosis system list is designed. When there is something wrong in sysem, the list will help the users to understand the fault so as to solve the problems as soon as possible.